Publications | Michael Lees

See google scholar for latest publications.

2024

Alcohol consumption as a socially contagious phenomenon in the Framingham Heart Study social network

Maarten WJ Ende , Han LJ Maas , Sacha Epskamp , and Mike H Lees

Scientific Reports, 2024

Publisher: Nature Publishing Group UK London

@article{van_den_ende_alcohol_2024,
  author = {van den Ende, Maarten WJ and van der Maas, Han LJ and Epskamp, Sacha and Lees, Mike H},
  date-modified = {2024-04-19 20:34:03 +0200},
  doi = {10.1038/s41598-024-54155-0},
  journal = {Scientific Reports},
  note = {Publisher: Nature Publishing Group UK London},
  number = {1},
  pages = {4499},
  title = {Alcohol consumption as a socially contagious phenomenon in the {Framingham} {Heart} {Study} social network},
  volume = {14},
  year = {2024},
  bdsk-url-1 = {https://doi.org/10.1038/s41598-024-54155-0}
}

Criminal organizations exhibit hysteresis, resilience, and robustness by balancing security and efficiency

Casper Elteren , Vı́tor V Vasconcelos , and Mike Lees

arXiv preprint arXiv:2403.03720, 2024

Bib

@article{van_elteren_criminal_2024,
  author = {van Elteren, Casper and Vasconcelos, V{\'\i}tor V and Lees, Mike},
  journal = {arXiv preprint arXiv:2403.03720},
  keywords = {⛔ No DOI found},
  title = {Criminal organizations exhibit hysteresis, resilience, and robustness by balancing security and efficiency},
  year = {2024}
}

2023

The dynamics of corruption under an optional external supervision service

Xin Zhou , Adam Belloum , Michael H Lees , Tom Engers , and Cees Laat

Applied Mathematics and Computation, 2023

Publisher: Elsevier

Bib HTML

@article{zhou_dynamics_2023,
  author = {Zhou, Xin and Belloum, Adam and Lees, Michael H and van Engers, Tom and de Laat, Cees},
  doi = {10.1016/j.amc.2023.128172},
  journal = {Applied Mathematics and Computation},
  note = {Publisher: Elsevier},
  pages = {128172},
  title = {The dynamics of corruption under an optional external supervision service},
  volume = {457},
  year = {2023},
  bdsk-url-1 = {https://doi.org/10.1016/j.amc.2023.128172}
}

Modeling Mechanisms of School Segregation and Policy Interventions: A Complexity Perspective

Eric Dignum , Willem Boterman , Andreas Flache , and Mike Lees

In International Conference on Computational Science , 2023

Bib HTML

@inproceedings{dignum_modeling_2023,
  author = {Dignum, Eric and Boterman, Willem and Flache, Andreas and Lees, Mike},
  booktitle = {International {Conference} on {Computational} {Science}},
  doi = {10.1007/978-3-031-36024-4_6},
  keywords = {⛔ No DOI found},
  pages = {74--89},
  publisher = {Springer Nature Switzerland Cham},
  title = {Modeling {Mechanisms} of {School} {Segregation} and {Policy} {Interventions}: {A} {Complexity} {Perspective}},
  year = {2023},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-031-36024-4_6}
}

Characterization of pedestrian contact interaction trajectories

Jaeyoung Kwak , Michael H Lees , and Wentong Cai

In International Conference on Computational Science , 2023

Bib HTML

@inproceedings{kwak_characterization_2023,
  author = {Kwak, Jaeyoung and Lees, Michael H and Cai, Wentong},
  booktitle = {International {Conference} on {Computational} {Science}},
  doi = {10.1007/978-3-031-35995-8_2},
  keywords = {⛔ No DOI found},
  pages = {18--32},
  publisher = {Springer Nature Switzerland Cham},
  title = {Characterization of pedestrian contact interaction trajectories},
  year = {2023},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-031-35995-8_2}
}

Data Integration Landscapes: The Case for Non-optimal Solutions in Network Diffusion Models

James Nevin , Paul Groth , and Michael Lees

In International Conference on Computational Science , 2023

Bib HTML

@inproceedings{nevin_data_2023,
  author = {Nevin, James and Groth, Paul and Lees, Michael},
  booktitle = {International {Conference} on {Computational} {Science}},
  doi = {10.1007/978-3-031-35995-8_35},
  keywords = {⛔ No DOI found},
  pages = {494--508},
  publisher = {Springer Nature Switzerland Cham},
  title = {Data {Integration} {Landscapes}: {The} {Case} for {Non}-optimal {Solutions} in {Network} {Diffusion} {Models}},
  year = {2023},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-031-35995-8_35}
}

An approach for analysing the impact of data integration on complex network diffusion models

James Nevin , Paul Groth , and Michael Lees

Journal of Complex Networks, 2023

Publisher: Oxford University Press

Bib HTML

@article{nevin_approach_2023,
  author = {Nevin, James and Groth, Paul and Lees, Michael},
  doi = {10.1093/comnet/cnad025},
  journal = {Journal of Complex Networks},
  note = {Publisher: Oxford University Press},
  number = {4},
  pages = {cnad025},
  title = {An approach for analysing the impact of data integration on complex network diffusion models},
  volume = {11},
  year = {2023},
  bdsk-url-1 = {https://doi.org/10.1093/comnet/cnad025}
}

2022

A review of mathematical modeling of addiction regarding both (neuro-) psychological processes and the social contagion perspectives

Maarten WJ Ende , Sacha Epskamp , Michael H Lees , Han LJ Maas , Reinout W Wiers , and 1 more author

Addictive behaviors, 2022

Publisher: Pergamon

Bib HTML

@article{van_den_ende_review_2022,
  author = {Van den Ende, Maarten WJ and Epskamp, Sacha and Lees, Michael H and van der Maas, Han LJ and Wiers, Reinout W and Sloot, Peter MA},
  doi = {10.1016/j.addbeh.2021.107201},
  journal = {Addictive behaviors},
  note = {Publisher: Pergamon},
  pages = {107201},
  title = {A review of mathematical modeling of addiction regarding both (neuro-) psychological processes and the social contagion perspectives},
  volume = {127},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1016/j.addbeh.2021.107201}
}

Maximum expected survival rate model for public access defibrillator placement

Ahmad Reza Pourghaderi , Nikita Kogtikov , Michael H Lees , Wentong Cai , Pin Pin Pek , and 6 more authors

Resuscitation, 2022

Publisher: Elsevier

Bib HTML

@article{pourghaderi_maximum_2022,
  author = {Pourghaderi, Ahmad Reza and Kogtikov, Nikita and Lees, Michael H and Cai, Wentong and Pek, Pin Pin and Ho, Andrew Fu Wah and Ng, Wei Ming and Kwak, Jaeyoung and White, Alexander Elgin and Lim, Shir Lynn and {others}},
  doi = {10.1016/j.resuscitation.2021.11.039},
  journal = {Resuscitation},
  note = {Publisher: Elsevier},
  pages = {213--221},
  title = {Maximum expected survival rate model for public access defibrillator placement},
  volume = {170},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1016/j.resuscitation.2021.11.039}
}

Influence of committed volunteers on helping behavior in emergency evacuations

Jaeyoung Kwak , Michael H Lees , Wentong Cai , Ahmad Reza Pourghaderi , and Marcus EH Ong

Journal of Physics: Complexity, 2022

Publisher: IOP Publishing

Bib HTML

@article{kwak_influence_2022,
  author = {Kwak, Jaeyoung and Lees, Michael H and Cai, Wentong and Pourghaderi, Ahmad Reza and Ong, Marcus EH},
  doi = {10.1088/2632-072x/ac48a1},
  journal = {Journal of Physics: Complexity},
  note = {Publisher: IOP Publishing},
  number = {1},
  pages = {015005},
  title = {Influence of committed volunteers on helping behavior in emergency evacuations},
  volume = {3},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1088/2632-072x/ac48a1}
}

Mechanisms for increased school segregation relative to residential segregation: A model-based analysis

Eric Dignum , Efi Athieniti , Willem Boterman , Andreas Flache , and Michael Lees

Computers, Environment and Urban Systems, 2022

Publisher: Pergamon

Bib HTML

@article{dignum_mechanisms_2022,
  author = {Dignum, Eric and Athieniti, Efi and Boterman, Willem and Flache, Andreas and Lees, Michael},
  doi = {10.1016/j.compenvurbsys.2022.101772},
  journal = {Computers, Environment and Urban Systems},
  note = {Publisher: Pergamon},
  pages = {101772},
  title = {Mechanisms for increased school segregation relative to residential segregation: A model-based analysis},
  volume = {93},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1016/j.compenvurbsys.2022.101772}
}

Behavioural thermal regulation explains pedestrian path choices in hot urban environments

Valentin R Melnikov , Georgios I Christopoulos , Valeria V Krzhizhanovskaya , Michael H Lees , and Peter MA Sloot

Scientific reports, 2022

Publisher: Nature Publishing Group UK London

Bib HTML

@article{melnikov_behavioural_2022,
  author = {Melnikov, Valentin R and Christopoulos, Georgios I and Krzhizhanovskaya, Valeria V and Lees, Michael H and Sloot, Peter MA},
  doi = {10.1038/s41598-022-06383-5},
  journal = {Scientific reports},
  note = {Publisher: Nature Publishing Group UK London},
  number = {1},
  pages = {2441},
  title = {Behavioural thermal regulation explains pedestrian path choices in hot urban environments},
  volume = {12},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1038/s41598-022-06383-5}
}

Understanding Complexity in Charging Infrastructure through the Lens of Social Supply–Demand Systems

Jurjen Helmus , Mike Lees , and Robert Hoed

World Electric Vehicle Journal, 2022

Publisher: MDPI

Bib HTML

@article{helmus_understanding_2022,
  author = {Helmus, Jurjen and Lees, Mike and van den Hoed, Robert},
  doi = {10.3390/wevj13030044},
  journal = {World Electric Vehicle Journal},
  note = {Publisher: MDPI},
  number = {3},
  pages = {44},
  title = {Understanding {Complexity} in {Charging} {Infrastructure} through the {Lens} of {Social} {Supply}--{Demand} {Systems}},
  volume = {13},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.3390/wevj13030044}
}

A validated agent-based model for stress testing charging infrastructure utilization

Jurjen R Helmus , Michael H Lees , and Robert Hoed

Transportation Research Part A: Policy and Practice, 2022

Publisher: Pergamon

Bib HTML

@article{helmus_validated_2022,
  author = {Helmus, Jurjen R and Lees, Michael H and van den Hoed, Robert},
  doi = {10.1016/j.tra.2022.03.028},
  journal = {Transportation Research Part A: Policy and Practice},
  note = {Publisher: Pergamon},
  pages = {237--262},
  title = {A validated agent-based model for stress testing charging infrastructure utilization},
  volume = {159},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1016/j.tra.2022.03.028}
}

Modelling the dynamic relationship between spread of infection and observed crowd movement patterns at large scale events

Philip Rutten , Michael H Lees , Sander Klous , Hans Heesterbeek , and Peter MA Sloot

Scientific Reports, 2022

Publisher: Nature Publishing Group UK London

Bib HTML

@article{rutten_modelling_2022,
  author = {Rutten, Philip and Lees, Michael H and Klous, Sander and Heesterbeek, Hans and Sloot, Peter MA},
  doi = {10.1038/s41598-022-19081-z},
  journal = {Scientific Reports},
  note = {Publisher: Nature Publishing Group UK London},
  number = {1},
  pages = {14825},
  title = {Modelling the dynamic relationship between spread of infection and observed crowd movement patterns at large scale events},
  volume = {12},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1038/s41598-022-19081-z}
}

Costly incentives design from an institutional perspective: cooperation, sustainability and affluence

Xin Zhou , Adam Belloum , Michael H Lees , Tom Engers , and Cees Laat

Proceedings of the Royal Society A, 2022

Publisher: The Royal Society

Bib HTML

@article{zhou_costly_2022,
  author = {Zhou, Xin and Belloum, Adam and Lees, Michael H and van Engers, Tom and de Laat, Cees},
  doi = {10.1098/rspa.2022.0393},
  journal = {Proceedings of the Royal Society A},
  keywords = {⛔ No DOI found},
  note = {Publisher: The Royal Society},
  number = {2265},
  pages = {20220393},
  title = {Costly incentives design from an institutional perspective: cooperation, sustainability and affluence},
  volume = {478},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1098/rspa.2022.0393}
}

Simulation-Based Analysis of Evacuation Elevator Allocation for a Multi-Level Hospital Emergency Department

Boyi Su , Jaeyoung Kwak , Ahmad Reza Pourghaderi , Michael H Lees , Kenneth BK Tan , and 5 more authors

In 2022 Winter Simulation Conference (WSC) , 2022

Bib HTML

@inproceedings{su_simulation-based_2022,
  author = {Su, Boyi and Kwak, Jaeyoung and Pourghaderi, Ahmad Reza and Lees, Michael H and Tan, Kenneth BK and Loo, Shin Yi and Chua, Ivan SY and Quah, Joy LJ and Cai, Wentong and Ong, Marcus EH},
  booktitle = {2022 {Winter} {Simulation} {Conference} ({WSC})},
  doi = {10.1109/wsc57314.2022.10015354},
  pages = {358--369},
  publisher = {IEEE},
  title = {Simulation-{Based} {Analysis} of {Evacuation} {Elevator} {Allocation} for a {Multi}-{Level} {Hospital} {Emergency} {Department}},
  year = {2022},
  bdsk-url-1 = {https://doi.org/10.1109/wsc57314.2022.10015354}
}

A review of mathematical modeling of addiction regarding both (neuro-) psychological processes and the social contagion perspectives

Maarten W. J. van den Ende , Sacha Epskamp , Michael H. Lees , Han L. J. van der Maas , Reinout W. Wiers , and 1 more author

Addictive Behaviors, 2022

Bib HTML

@article{ende_review_2022,
  author = {Ende, Maarten W. J. van den and Epskamp, Sacha and Lees, Michael H. and Maas, Han L. J. van der and Wiers, Reinout W. and Sloot, Peter M. A.},
  bdsk-url-2 = {https://doi.org/10.1016/j.addbeh.2021.107201},
  doi = {10.1016/j.addbeh.2021.107201},
  issn = {0306-4603},
  journal = {Addictive Behaviors},
  keywords = {Addiction, Agent-based modeling, Computational modeling, Dynamical systems, Formal theories, Review},
  pages = {107201},
  title = {A review of mathematical modeling of addiction regarding both (neuro-) psychological processes and the social contagion perspectives},
  url = {https://www.sciencedirect.com/science/article/pii/S0306460321003865},
  volume = {127},
  year = {2022},
  bdsk-url-1 = {https://www.sciencedirect.com/science/article/pii/S0306460321003865}
}

2021

Estimating horizontal movement performance of patient beds and the impact on emergency evacuation time

Jaeyoung Kwak , Michael H Lees , Wentong Cai , Ahmad Reza Pourghaderi , and Marcus EH Ong

Safety science, 2021

Publisher: Elsevier

Bib HTML

@article{kwak_estimating_2021,
  author = {Kwak, Jaeyoung and Lees, Michael H and Cai, Wentong and Pourghaderi, Ahmad Reza and Ong, Marcus EH},
  doi = {10.1016/j.ssci.2020.105038},
  journal = {Safety science},
  note = {Publisher: Elsevier},
  pages = {105038},
  title = {Estimating horizontal movement performance of patient beds and the impact on emergency evacuation time},
  volume = {134},
  year = {2021},
  bdsk-url-1 = {https://doi.org/10.1016/j.ssci.2020.105038}
}

Intermittent and persistent movement patterns of dance event visitors in large sporting venues

Philip Rutten , Michael H Lees , Sander Klous , and Peter MA Sloot

Physica A: Statistical Mechanics and its Applications, 2021

Publisher: North-Holland

Bib HTML

@article{rutten_intermittent_2021,
  author = {Rutten, Philip and Lees, Michael H and Klous, Sander and Sloot, Peter MA},
  doi = {10.1016/j.physa.2020.125448},
  journal = {Physica A: Statistical Mechanics and its Applications},
  note = {Publisher: North-Holland},
  pages = {125448},
  title = {Intermittent and persistent movement patterns of dance event visitors in large sporting venues},
  volume = {563},
  year = {2021},
  bdsk-url-1 = {https://doi.org/10.1016/j.physa.2020.125448}
}

20 years of computational science: Selected papers from 2020 International Conference on Computational Science

Sergey V Kovalchuk , Valeria V Krzhizhanovskaya , PMA Sloot , Gábor Závodszky , Michael H Lees , and 2 more authors

Journal of Computational Science, 2021

Bib HTML

@article{kovalchuk_20_2021,
  author = {Kovalchuk, Sergey V and Krzhizhanovskaya, Valeria V and Sloot, PMA and Z{\'a}vodszky, G{\'a}bor and Lees, Michael H and Paszy{\'n}ski, M and Dongarra, J},
  doi = {10.1016/j.jocs.2021.101395},
  journal = {Journal of Computational Science},
  pages = {101395--101395},
  title = {20 years of computational science: {Selected} papers from 2020 {International} {Conference} on {Computational} {Science}},
  volume = {53},
  year = {2021},
  bdsk-url-1 = {https://doi.org/10.1016/j.jocs.2021.101395}
}

State-space models reveal bursty movement behaviour of dance event visitors

Philip Rutten , Michael H Lees , Sander Klous , and Peter MA Sloot

EPJ Data Science, 2021

Publisher: Springer Berlin Heidelberg

Bib HTML

@article{rutten_state-space_2021,
  author = {Rutten, Philip and Lees, Michael H and Klous, Sander and Sloot, Peter MA},
  doi = {10.1140/epjds/s13688-021-00292-9},
  journal = {EPJ Data Science},
  note = {Publisher: Springer Berlin Heidelberg},
  number = {1},
  pages = {35},
  title = {State-space models reveal bursty movement behaviour of dance event visitors},
  volume = {10},
  year = {2021},
  bdsk-url-1 = {https://doi.org/10.1140/epjds/s13688-021-00292-9}
}

Ensemble learning for large-scale crowd flow prediction

Vladislav Karbovskii , Michael Lees, Alva Presbitero , Alexey Kurilkin , Daniil Voloshin , and 3 more authors

Engineering Applications of Artificial Intelligence, 2021

Publisher: Pergamon

Bib HTML

@article{karbovskii_ensemble_2021,
  author = {Karbovskii, Vladislav and Lees, Michael and Presbitero, Alva and Kurilkin, Alexey and Voloshin, Daniil and Derevitskii, Ivan and Karsakov, Andrey and Sloot, Peter MA},
  doi = {10.1016/j.engappai.2021.104469},
  journal = {Engineering Applications of Artificial Intelligence},
  note = {Publisher: Pergamon},
  pages = {104469},
  title = {Ensemble learning for large-scale crowd flow prediction},
  volume = {106},
  year = {2021},
  bdsk-url-1 = {https://doi.org/10.1016/j.engappai.2021.104469}
}

Advancing urban mental health research: From complexity science to actionable targets for intervention

Junus M Wal , Claudia D Borkulo , Marie K Deserno , Josefien JF Breedvelt , Mike Lees , and 6 more authors

The Lancet Psychiatry, 2021

Publisher: Elsevier

Bib HTML

@article{van_der_wal_advancing_2021,
  author = {van der Wal, Junus M and van Borkulo, Claudia D and Deserno, Marie K and Breedvelt, Josefien JF and Lees, Mike and Lokman, John C and Borsboom, Denny and Denys, Damiaan and van Holst, Ruth J and Smidt, Marten P and {others}},
  doi = {10.1016/s2215-0366(21)00047-x},
  journal = {The Lancet Psychiatry},
  note = {Publisher: Elsevier},
  number = {11},
  pages = {991--1000},
  title = {Advancing urban mental health research: {From} complexity science to actionable targets for intervention},
  volume = {8},
  year = {2021},
  bdsk-url-1 = {https://doi.org/10.1016/s2215-0366(21)00047-x}
}

Dynamics in and dynamics of networks using DyNSimF

Maarten Ende , Mathijs Mayer , Sacha Epskamp , Michael Lees, and Han Maas

2021

Publisher: PsyArXiv

Bib HTML

@article{van_den_ende_dynamics_2021,
  author = {van den Ende, Maarten and Mayer, Mathijs and Epskamp, Sacha and Lees, Michael and van der Maas, Han},
  doi = {10.31234/osf.io/6kcfz},
  note = {Publisher: PsyArXiv},
  title = {Dynamics in and dynamics of networks using {DyNSimF}},
  year = {2021},
  bdsk-url-1 = {https://doi.org/10.31234/osf.io/6kcfz}
}

The non-linear impact of data handling on network diffusion models

James Nevin , Michael Lees, and Paul Groth

Patterns, 2021

Publisher: Elsevier

Bib HTML

@article{nevin_non-linear_2021,
  author = {Nevin, James and Lees, Michael and Groth, Paul},
  doi = {10.1016/j.patter.2021.100397},
  journal = {Patterns},
  note = {Publisher: Elsevier},
  number = {12},
  pages = {100397},
  title = {The non-linear impact of data handling on network diffusion models},
  volume = {2},
  year = {2021},
  bdsk-url-1 = {https://doi.org/10.1016/j.patter.2021.100397}
}

2020

An exploratory factor analysis model for slum severity index in Mexico City

Debraj Roy , David Bernal , and Michael Lees

Urban studies, 2020

Publisher: SAGE Publications Sage UK: London, England

Bib HTML

@article{roy_exploratory_2020,
  author = {Roy, Debraj and Bernal, David and Lees, Michael},
  doi = {10.1177/0042098019869769},
  journal = {Urban studies},
  note = {Publisher: SAGE Publications Sage UK: London, England},
  number = {4},
  pages = {789--805},
  title = {An exploratory factor analysis model for slum severity index in {Mexico} {City}},
  volume = {57},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1177/0042098019869769}
}

The impact of pace of life on pedestrian heat stress: A computational modelling approach.

Valentin R Melnikov , Valeria V Krzhizhanovskaya , Michael H Lees , and Peter MA Sloot

Environmental research, 2020

Publisher: Academic Press

Bib HTML

@article{melnikov_impact_2020,
  author = {Melnikov, Valentin R and Krzhizhanovskaya, Valeria V and Lees, Michael H and Sloot, Peter MA},
  doi = {10.1016/j.envres.2020.109397},
  journal = {Environmental research},
  note = {Publisher: Academic Press},
  pages = {109397},
  title = {The impact of pace of life on pedestrian heat stress: {A} computational modelling approach.},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1016/j.envres.2020.109397}
}

A data driven typology of electric vehicle user types and charging sessions

Jurjen R Helmus , Michael H Lees , and Robert Hoed

Transportation Research Part C: Emerging Technologies, 2020

Publisher: Pergamon

Bib HTML

@article{helmus_data_2020,
  author = {Helmus, Jurjen R and Lees, Michael H and van den Hoed, Robert},
  doi = {10.1016/j.trc.2020.102637},
  journal = {Transportation Research Part C: Emerging Technologies},
  note = {Publisher: Pergamon},
  pages = {102637},
  title = {A data driven typology of electric vehicle user types and charging sessions},
  volume = {115},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1016/j.trc.2020.102637}
}

Modeling Helping Behavior in Emergency Evacuations Using Volunteer’s Dilemma Game

Jaeyoung Kwak , Michael H Lees , Wentong Cai , and Marcus EH Ong

In International Conference on Computational Science , 2020

Bib HTML

@inproceedings{kwak_modeling_2020,
  author = {Kwak, Jaeyoung and Lees, Michael H and Cai, Wentong and Ong, Marcus EH},
  booktitle = {International {Conference} on {Computational} {Science}},
  doi = {10.1007/978-3-030-50371-0_38},
  keywords = {⛔ No DOI found},
  pages = {513--523},
  publisher = {Springer, Cham},
  title = {Modeling {Helping} {Behavior} in {Emergency} {Evacuations} {Using} {Volunteer}'s {Dilemma} {Game}},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-030-50371-0_38}
}

Risk-Based AED Placement-Singapore Case

Ivan Derevitskii , Nikita Kogtikov , Michael H Lees , Wentong Cai , and Marcus EH Ong

In International Conference on Computational Science , 2020

Bib HTML

@inproceedings{derevitskii_risk-based_2020,
  author = {Derevitskii, Ivan and Kogtikov, Nikita and Lees, Michael H and Cai, Wentong and Ong, Marcus EH},
  booktitle = {International {Conference} on {Computational} {Science}},
  doi = {10.1007/978-3-030-50423-6_43},
  keywords = {⛔ No DOI found},
  pages = {577--590},
  publisher = {Springer, Cham},
  title = {Risk-{Based} {AED} {Placement}-{Singapore} {Case}},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-030-50423-6_43}
}

Computational Science–ICCS 2020: 20th International Conference, Amsterdam, The Netherlands, June 3–5, 2020, Proceedings, Part I

Valeria V Krzhizhanovskaya , Gábor Závodszky , Michael H Lees , Jack J Dongarra , Peter MA Sloot , and 2 more authors

2020

Large-scale forecasting of information spreading

Oksana Severiukhina , Sergey Kesarev , Klavdiya Bochenina , Alexander Boukhanovsky , Michael H Lees , and 1 more author

Journal of Big Data, 2020

Publisher: SpringerOpen

Bib HTML

@article{severiukhina_large-scale_2020,
  author = {Severiukhina, Oksana and Kesarev, Sergey and Bochenina, Klavdiya and Boukhanovsky, Alexander and Lees, Michael H and Sloot, Peter MA},
  doi = {10.1186/s40537-020-00350-5},
  journal = {Journal of Big Data},
  note = {Publisher: SpringerOpen},
  number = {1},
  pages = {1--17},
  title = {Large-scale forecasting of information spreading},
  volume = {7},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1186/s40537-020-00350-5}
}

Computational Science in the Interconnected World: Selected papers from 2019 International Conference on Computational Science

Pedro JS Cardoso , João MF Rodrigues , Jânio Monteiro , Roberto Lam , Valeria V Krzhizhanovskaya , and 3 more authors

Journal of Computational Science, 2020

Publisher: Elsevier

Bib HTML

@article{cardoso_computational_2020,
  author = {Cardoso, Pedro JS and Rodrigues, Jo{\~a}o MF and Monteiro, J{\^a}nio and Lam, Roberto and Krzhizhanovskaya, Valeria V and Lees, Michael H and Dongarra, Jack and Sloot, Peter MA},
  doi = {10.1016/j.jocs.2020.101222},
  journal = {Journal of Computational Science},
  note = {Publisher: Elsevier},
  title = {Computational {Science} in the {Interconnected} {World}: {Selected} papers from 2019 {International} {Conference} on {Computational} {Science}},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1016/j.jocs.2020.101222}
}

Intermittent and persistent movement patterns of dance event visitors in large sporting venues

Philip Rutten , Michael H Lees , Sander Klous , and Peter MA Sloot

Physica A: Statistical Mechanics and its Applications, 2020

Publisher: North-Holland

Bib HTML

@article{rutten_intermittent_2020,
  author = {Rutten, Philip and Lees, Michael H and Klous, Sander and Sloot, Peter MA},
  doi = {10.1016/j.physa.2020.125448},
  journal = {Physica A: Statistical Mechanics and its Applications},
  keywords = {⛔ No DOI found},
  note = {Publisher: North-Holland},
  pages = {125448},
  title = {Intermittent and persistent movement patterns of dance event visitors in large sporting venues},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1016/j.physa.2020.125448}
}

Understanding resilience in slums using an agent-based model

Debraj Roy , and Michael Lees

Computers, Environment and Urban Systems, 2020

Publisher: Pergamon

Bib HTML

@article{roy_understanding_2020,
  author = {Roy, Debraj and Lees, Michael},
  doi = {10.1016/j.compenvurbsys.2019.101458},
  journal = {Computers, Environment and Urban Systems},
  note = {Publisher: Pergamon},
  pages = {101458},
  title = {Understanding resilience in slums using an agent-based model},
  volume = {80},
  year = {2020},
  bdsk-url-1 = {https://doi.org/10.1016/j.compenvurbsys.2019.101458}
}

2019

Satsense: an open source Python library for land-use and land-cover classification using earth observation data.

Bouwe Andela , Berend Weel , Elena Ranguelova , Niels Drost , Maximilian Filtenborg , and 3 more authors

In Geophysical Research Abstracts , 2019

The impact of different obstacles on crowd dynamics

Vladislav Karbovskii , Oksana Severiukhina , Ivan Derevitskii , Daniil Voloshin , Alva Presbitero , and 1 more author

Journal of Computational Science, 2019

Publisher: Elsevier

Bib HTML

@article{karbovskii_impact_2019,
  author = {Karbovskii, Vladislav and Severiukhina, Oksana and Derevitskii, Ivan and Voloshin, Daniil and Presbitero, Alva and Lees, Michael},
  doi = {10.1016/j.jocs.2018.06.010},
  journal = {Journal of Computational Science},
  note = {Publisher: Elsevier},
  pages = {100893},
  title = {The impact of different obstacles on crowd dynamics},
  volume = {36},
  year = {2019},
  bdsk-url-1 = {https://doi.org/10.1016/j.jocs.2018.06.010}
}

Detecting high indoor crowd density with Wi-Fi localization: A statistical mechanics approach

Sonja Georgievska , Philip Rutten , Jan Amoraal , Elena Ranguelova , Rena Bakhshi , and 3 more authors

Journal of Big Data, 2019

Publisher: SpringerOpen

Bib HTML

@article{georgievska_detecting_2019,
  author = {Georgievska, Sonja and Rutten, Philip and Amoraal, Jan and Ranguelova, Elena and Bakhshi, Rena and de Vries, Ben L and Lees, Michael and Klous, Sander},
  doi = {10.1186/s40537-019-0194-3},
  journal = {Journal of Big Data},
  note = {Publisher: SpringerOpen},
  number = {1},
  pages = {31},
  title = {Detecting high indoor crowd density with {Wi}-{Fi} localization: {A} statistical mechanics approach},
  volume = {6},
  year = {2019},
  bdsk-url-1 = {https://doi.org/10.1186/s40537-019-0194-3}
}

Exploring a Complex Systems Approach to Charging Infrastructure: implications for researchers and policy makers

JR Helmus , R Hoed , and MH Lees

In 32nd International Electric Vehicle Symposium , 2019

Bib HTML

@inproceedings{helmus_exploring_2019,
  author = {Helmus, JR and van den Hoed, R and Lees, MH},
  booktitle = {32nd {International} {Electric} {Vehicle} {Symposium}},
  keywords = {⛔ No DOI found},
  pages = {23},
  title = {Exploring a {Complex} {Systems} {Approach} to {Charging} {Infrastructure}: implications for researchers and policy makers},
  url = {https://hdl.handle.net/20.500.11884/7f822ff6-47d9-439d-8568-5ef4d566b226},
  volume = {23},
  year = {2019},
  bdsk-url-1 = {https://hdl.handle.net/20.500.11884/7f822ff6-47d9-439d-8568-5ef4d566b226}
}

Image based classification of slums, built-up and non-built-up areas in Kalyan and Bangalore, India

Elena Ranguelova , Berend Weel , Debraj Roy , Monika Kuffer , Karin Pfeffer , and 1 more author

European journal of remote sensing, 2019

Publisher: Taylor & Francis

Bib HTML

@article{ranguelova_image_2019,
  author = {Ranguelova, Elena and Weel, Berend and Roy, Debraj and Kuffer, Monika and Pfeffer, Karin and Lees, Michael},
  doi = {10.1080/22797254.2018.1535838},
  journal = {European journal of remote sensing},
  note = {Publisher: Taylor \& Francis},
  number = {sup1},
  pages = {40--61},
  title = {Image based classification of slums, built-up and non-built-up areas in {Kalyan} and {Bangalore}, {India}},
  volume = {52},
  year = {2019},
  bdsk-url-1 = {https://doi.org/10.1080/22797254.2018.1535838}
}

Simulation of Future Electric Vehicle Charging behavior—Effects of transition from PHEV to FEV

Igna Vermeulen , Jurjen Rienk Helmus , Mike Lees , and Robert Van Den Hoed

World Electric Vehicle Journal, 2019

Publisher: Multidisciplinary Digital Publishing Institute

Bib HTML

@article{vermeulen_simulation_2019,
  author = {Vermeulen, Igna and Helmus, Jurjen Rienk and Lees, Mike and Van Den Hoed, Robert},
  doi = {10.3390/wevj10020042},
  journal = {World Electric Vehicle Journal},
  note = {Publisher: Multidisciplinary Digital Publishing Institute},
  number = {2},
  pages = {42},
  title = {Simulation of {Future} {Electric} {Vehicle} {Charging} behavior---{Effects} of transition from {PHEV} to {FEV}},
  volume = {10},
  year = {2019},
  bdsk-url-1 = {https://doi.org/10.3390/wevj10020042}
}

SEVA: A Data driven model of Electric Vehicle Charging Behavior

Jurjen R Helmus , Seyla Wachlin , Igna Vermeulen , and Mike H Lees

arXiv preprint arXiv:1904.08748, 2019

Bib HTML

@article{helmus_seva_2019,
  author = {Helmus, Jurjen R and Wachlin, Seyla and Vermeulen, Igna and Lees, Mike H},
  doi = {10.48550/arXiv.1904.08748},
  journal = {arXiv preprint arXiv:1904.08748},
  keywords = {⛔ No DOI found},
  title = {{SEVA}: {A} {Data} driven model of {Electric} {Vehicle} {Charging} {Behavior}},
  year = {2019},
  bdsk-url-1 = {https://doi.org/10.48550/arXiv.1904.08748}
}

Science at the Intersection of Data, Modelling, and Computation

Sergey V Kovalchuk , Valeria V Krzhizhanovskaya , Yong Shi , Haohuan Fu , Michael H Lees , and 2 more authors

2019

2018

ReGIS-Visualization and Simulation of GIS data made easy

Berend Weel , Carlos Martinez , Joris Borgdorff , Maarten Meersbergen , and Mike Lees

In EGU General Assembly Conference Abstracts , 2018

Spatial segregation, inequality, and opportunity bias in the slums of Bengaluru

Debraj Roy , Michael Harold Lees , Karin Pfeffer , and Peter MA Sloot

Cities, 2018

Publisher: Pergamon

Bib HTML

@article{roy_spatial_2018,
  author = {Roy, Debraj and Lees, Michael Harold and Pfeffer, Karin and Sloot, Peter MA},
  doi = {10.1016/j.cities.2017.12.014},
  journal = {Cities},
  note = {Publisher: Pergamon},
  pages = {269--276},
  title = {Spatial segregation, inequality, and opportunity bias in the slums of {Bengaluru}},
  volume = {74},
  year = {2018},
  bdsk-url-1 = {https://doi.org/10.1016/j.cities.2017.12.014}
}

Analysis of publication activity of computational science society in 2001–2017 using topic modelling and graph theory

Tesfamariam M Abuhay , Sergey V Kovalchuk , Klavdiya Bochenina , Gali-Ketema Mbogo , Alexander A Visheratin , and 3 more authors

Journal of computational science, 2018

Publisher: Elsevier

Bib HTML

@article{abuhay_analysis_2018,
  author = {Abuhay, Tesfamariam M and Kovalchuk, Sergey V and Bochenina, Klavdiya and Mbogo, Gali-Ketema and Visheratin, Alexander A and Kampis, George and Krzhizhanovskaya, Valeria V and Lees, Michael H},
  doi = {10.1016/j.jocs.2018.04.004},
  journal = {Journal of computational science},
  note = {Publisher: Elsevier},
  pages = {193--204},
  title = {Analysis of publication activity of computational science society in 2001--2017 using topic modelling and graph theory},
  volume = {26},
  year = {2018},
  bdsk-url-1 = {https://doi.org/10.1016/j.jocs.2018.04.004}
}

The art of computational science: Bridging gaps–forming alloys

Sergey V Kovalchuk , Valeria V Krzhizhanovskaya , Petros Koumoutsakos , Eleni Chatzi , Michael H Lees , and 2 more authors

2018
Computational Science–ICCS 2018: 18th International Conference, Wuxi, China, June 11–13, 2018, Proceedings

Yong Shi , Haohuan Fu , Yingjie Tian , Valeria V Krzhizhanovskaya , Michael Harold Lees , and 2 more authors

2018

Assessment of public charging infrastructure push and pull rollout strategies: The case of the Netherlands

JR Helmus , JC Spoelstra , N Refa , M Lees , and Robert Hoed

Energy policy, 2018

Publisher: Elsevier

Bib HTML

@article{helmus_assessment_2018,
  author = {Helmus, JR and Spoelstra, JC and Refa, N and Lees, M and van den Hoed, Robert},
  doi = {10.1016/j.enpol.2018.06.011},
  journal = {Energy policy},
  note = {Publisher: Elsevier},
  pages = {35--47},
  title = {Assessment of public charging infrastructure push and pull rollout strategies: {The} case of the {Netherlands}},
  volume = {121},
  year = {2018},
  bdsk-url-1 = {https://doi.org/10.1016/j.enpol.2018.06.011}
}

System dynamics of human body thermal regulation in outdoor environments

Valentin Melnikov , Valeria V Krzhizhanovskaya , Michael H Lees , and Peter MA Sloot

Building and Environment, 2018

Publisher: Pergamon

Bib HTML

@article{melnikov_system_2018,
  author = {Melnikov, Valentin and Krzhizhanovskaya, Valeria V and Lees, Michael H and Sloot, Peter MA},
  doi = {10.1016/j.buildenv.2018.07.024},
  journal = {Building and Environment},
  note = {Publisher: Pergamon},
  pages = {760--769},
  title = {System dynamics of human body thermal regulation in outdoor environments},
  volume = {143},
  year = {2018},
  bdsk-url-1 = {https://doi.org/10.1016/j.buildenv.2018.07.024}
}

Vulnerability Of Charging Infrastructure, A Novel Approach For Improving Charging Station Deployment

M Glombek , JR Helmus , M Lees , R Hoed , and R Quax

In Transport Reseach Arena Vienna , 2018

Bib HTML

@inproceedings{glombek_vulnerability_2018,
  author = {Glombek, M and Helmus, JR and Lees, M and van den Hoed, R and Quax, R},
  booktitle = {Transport {Reseach} {Arena} {Vienna}},
  doi = {10.5281/zenodo.1483468},
  keywords = {⛔ No DOI found},
  title = {Vulnerability {Of} {Charging} {Infrastructure}, {A} {Novel} {Approach} {For} {Improving} {Charging} {Station} {Deployment}},
  year = {2018},
  bdsk-url-1 = {https://doi.org/10.5281/zenodo.1483468}
}

Survey-based socio-economic data from slums in Bangalore, India

Debraj Roy , Bharath Palavalli , Niveditha Menon , Robin King , Karin Pfeffer , and 2 more authors

Scientific data, 2018

Publisher: Nature Publishing Group

Bib HTML

@article{roy_survey-based_2018,
  author = {Roy, Debraj and Palavalli, Bharath and Menon, Niveditha and King, Robin and Pfeffer, Karin and Lees, Michael and Sloot, Peter MA},
  doi = {10.1038/sdata.2017.200},
  journal = {Scientific data},
  note = {Publisher: Nature Publishing Group},
  pages = {170200},
  title = {Survey-based socio-economic data from slums in {Bangalore}, {India}},
  volume = {5},
  year = {2018},
  bdsk-url-1 = {https://doi.org/10.1038/sdata.2017.200}
}

2017

Automatic model construction for the behavior of human crowds

Jinghui Zhong , Wentong Cai , Michael Lees, and Linbo Luo

Applied Soft Computing, 2017

Publisher: Elsevier

Bib HTML

@article{zhong_automatic_2017,
  author = {Zhong, Jinghui and Cai, Wentong and Lees, Michael and Luo, Linbo},
  doi = {10.1016/j.asoc.2017.03.020},
  journal = {Applied Soft Computing},
  note = {Publisher: Elsevier},
  pages = {368--378},
  title = {Automatic model construction for the behavior of human crowds},
  volume = {56},
  year = {2017},
  bdsk-url-1 = {https://doi.org/10.1016/j.asoc.2017.03.020}
}

Modelling the impact of household life cycle on slums in Bangalore

Debraj Roy , Michael Harold Lees , Karin Pfeffer , and Peter MA Sloot

Computers, Environment and Urban Systems, 2017

Publisher: Pergamon

Bib HTML

@article{roy_modelling_2017,
  author = {Roy, Debraj and Lees, Michael Harold and Pfeffer, Karin and Sloot, Peter MA},
  doi = {10.1016/j.compenvurbsys.2017.03.008},
  journal = {Computers, Environment and Urban Systems},
  note = {Publisher: Pergamon},
  pages = {275--287},
  title = {Modelling the impact of household life cycle on slums in {Bangalore}},
  volume = {64},
  year = {2017},
  bdsk-url-1 = {https://doi.org/10.1016/j.compenvurbsys.2017.03.008}
}

Analysis of Computational Science Papers from ICCS 2001-2016 using Topic Modeling and Graph Theory

Tesfamariam M Abuhay , Sergey V Kovalchuk , Klavdiya O Bochenina , George Kampis , Valeria V Krzhizhanovskaya , and 1 more author

Procedia Computer Science, 2017

Publisher: Elsevier

Bib HTML

@article{abuhay_analysis_2017,
  author = {Abuhay, Tesfamariam M and Kovalchuk, Sergey V and Bochenina, Klavdiya O and Kampis, George and Krzhizhanovskaya, Valeria V and Lees, Michael H},
  doi = {10.1016/j.procs.2017.05.183},
  journal = {Procedia Computer Science},
  note = {Publisher: Elsevier},
  pages = {7--17},
  title = {Analysis of {Computational} {Science} {Papers} from {ICCS} 2001-2016 using {Topic} {Modeling} and {Graph} {Theory}},
  volume = {108},
  year = {2017},
  bdsk-url-1 = {https://doi.org/10.1016/j.procs.2017.05.183}
}

Data through the Computational Lens

Sergey V Kovalchuk , Tesfamariam M Abuhay , Ilkay Altintas , Michael L Norman , Michael H Lees , and 3 more authors

2017

Relaxing Synchronization in Parallel Agent-Based Road Traffic Simulation

Yadong Xu , Wentong Cai , Heiko Aydt , Michael Lees, and Daniel Zehe

ACM Transactions on Modeling and Computer Simulation (TOMACS), 2017

Publisher: ACM

Bib HTML

@article{xu_relaxing_2017,
  author = {Xu, Yadong and Cai, Wentong and Aydt, Heiko and Lees, Michael and Zehe, Daniel},
  doi = {10.1145/2994143},
  journal = {ACM Transactions on Modeling and Computer Simulation (TOMACS)},
  note = {Publisher: ACM},
  number = {2},
  pages = {14},
  title = {Relaxing {Synchronization} in {Parallel} {Agent}-{Based} {Road} {Traffic} {Simulation}},
  volume = {27},
  year = {2017},
  bdsk-url-1 = {https://doi.org/10.1145/2994143}
}

The Art of Computational Science, Bridging Gaps–Forming Alloys. Preface for ICCS 2017

Petros Koumoutsakos , Eleni Chatzi , Valeria V Krzhizhanovskaya , Michael Lees, Jack Dongarra , and 1 more author

Procedia Computer Science, 2017

Publisher: Elsevier

Bib HTML

@article{koumoutsakos_art_2017,
  author = {Koumoutsakos, Petros and Chatzi, Eleni and Krzhizhanovskaya, Valeria V and Lees, Michael and Dongarra, Jack and Sloot, Peter MA},
  doi = {10.1016/j.procs.2017.05.281},
  journal = {Procedia Computer Science},
  note = {Publisher: Elsevier},
  pages = {1--6},
  title = {The {Art} of {Computational} {Science}, {Bridging} {Gaps}--{Forming} {Alloys}. {Preface} for {ICCS} 2017},
  volume = {108},
  year = {2017},
  bdsk-url-1 = {https://doi.org/10.1016/j.procs.2017.05.281}
}

The study of the influence of obstacles on crowd dynamics

Oksana Severiukhina , Daniil Voloshin , MH Lees , and Vladislav Karbovskii

Procedia Computer Science, 2017

Publisher: Elsevier

Bib HTML

@article{severiukhina_study_2017,
  author = {Severiukhina, Oksana and Voloshin, Daniil and Lees, MH and Karbovskii, Vladislav},
  doi = {10.1016/j.procs.2017.05.162},
  journal = {Procedia Computer Science},
  note = {Publisher: Elsevier},
  pages = {215--224},
  title = {The study of the influence of obstacles on crowd dynamics},
  volume = {108},
  year = {2017},
  bdsk-url-1 = {https://doi.org/10.1016/j.procs.2017.05.162}
}

Design and evaluation of a data-driven scenario generation framework for game-based training

Linbo Luo , Haiyan Yin , Wentong Cai , Jinghui Zhong , and Michael Lees

IEEE Transactions on Computational Intelligence and AI in Games, 2017

Publisher: IEEE

Bib HTML

@article{luo_design_2017,
  author = {Luo, Linbo and Yin, Haiyan and Cai, Wentong and Zhong, Jinghui and Lees, Michael},
  doi = {10.1109/tciaig.2016.2541168},
  journal = {IEEE Transactions on Computational Intelligence and AI in Games},
  note = {Publisher: IEEE},
  title = {Design and evaluation of a data-driven scenario generation framework for game-based training},
  year = {2017},
  bdsk-url-1 = {https://doi.org/10.1109/tciaig.2016.2541168}
}

2016

International Conference on Computational Science 2016, ICCS 2016: 6-8 June 2016, San Diego, California, USA

I Altintas , M Norman , J Dongarra , VV Krzhizhanovskaya , M Lees , and 1 more author

Procedia Computer Science, 2016

Publisher: Elsevier

Data through the Computational Lens, Preface for ICCS 2016.

Ilkay Altintas , Michael Normal , Michael Lees, Valeria V Krzhizhanovskaya , Jack J Dongarra , and 1 more author

In ICCS , 2016

Bib HTML

@inproceedings{altintas_data_2016,
  author = {Altintas, Ilkay and Normal, Michael and Lees, Michael and Krzhizhanovskaya, Valeria V and Dongarra, Jack J and Sloot, Peter MA},
  booktitle = {{ICCS}},
  doi = {10.1016/j.procs.2016.05.426},
  keywords = {⛔ No DOI found},
  pages = {1--7},
  title = {Data through the {Computational} {Lens}, {Preface} for {ICCS} 2016.},
  year = {2016},
  bdsk-url-1 = {https://doi.org/10.1016/j.procs.2016.05.426}
}

Data-driven travel demand modelling and agent-based traffic simulation in Amsterdam urban area

VR Melnikov , Valeria V Krzhizhanovskaya , Michael Harold Lees , and Alexander V Boukhanovsky

Procedia Computer Science, 2016

Publisher: Elsevier

Bib HTML

@article{melnikov_data-driven_2016,
  author = {Melnikov, VR and Krzhizhanovskaya, Valeria V and Lees, Michael Harold and Boukhanovsky, Alexander V},
  doi = {10.1016/j.procs.2016.05.523},
  journal = {Procedia Computer Science},
  note = {Publisher: Elsevier},
  pages = {2030--2041},
  title = {Data-driven travel demand modelling and agent-based traffic simulation in {Amsterdam} urban area},
  volume = {80},
  year = {2016},
  bdsk-url-1 = {https://doi.org/10.1016/j.procs.2016.05.523}
}

2015

Density-based evolutionary framework for crowd model calibration

Jinghui Zhong , Nan Hu , Wentong Cai , Michael Lees, and Linbo Luo

Journal of Computational Science, Jan 2015

Abs Bib HTML

Crowd modeling and simulation is an important and active research field, with a wide range of applications such as computer games, military training and evacuation modeling. One important issue in crowd modeling is model calibration through parameter tuning, so as to produce desired crowd behaviors. Common methods such as trial-and-error are time consuming and tedious. This paper proposes an evolutionary framework to automate the crowd model calibration process. In the proposed framework, a density-based matching scheme is introduced. By using the dynamic density of the crowd over time, and a weight landscape to emphasize important spatial regions, the proposed matching scheme provides a generally applicable way to evaluate the simulated crowd behaviors. Besides, a hybrid search mechanism based on differential evolution is proposed to efficiently tune parameters of crowd models. Simulation results demonstrate that the proposed framework is effective and efficient to calibrate the crowd models in order to produce desired macroscopic crowd behaviors.
@article{zhong_density-based_2015, author = {Zhong, Jinghui and Hu, Nan and Cai, Wentong and Lees, Michael and Luo, Linbo}, bdsk-url-2 = {https://doi.org/10.1016/j.jocs.2014.09.002}, doi = {10.1016/j.jocs.2014.09.002}, issn = {18777503}, journal = {Journal of Computational Science}, keywords = {Crowd modeling and simulation, Density distribution, Differential evolution, Evolutionary algorithm, Model calibration}, month = jan, pages = {11--22}, title = {Density-based evolutionary framework for crowd model calibration}, url = {http://www.sciencedirect.com/science/article/pii/S1877750314001203}, volume = {6}, year = {2015}, bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S1877750314001203} }

Information impact on transportation systems

Sorina Litescu , Vaisagh Viswanathan , Michael Lees, Alois Knoll , and Heiko Aydt

Journal of Computational Science, Jan 2015

Publisher: Elsevier

Bib HTML

@article{litescu_information_2015,
  author = {Litescu, Sorina and Viswanathan, Vaisagh and Lees, Michael and Knoll, Alois and Aydt, Heiko},
  doi = {10.1016/j.jocs.2015.04.019},
  journal = {Journal of Computational Science},
  note = {Publisher: Elsevier},
  pages = {88--93},
  title = {Information impact on transportation systems},
  volume = {9},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.1016/j.jocs.2015.04.019}
}

Computational Science at the Gates of Nature, Preface for ICCS 2015

Slawomir Koziel , Leifur Leifsson , Michael Lees, Valeria V Krzhizhanovskaya , Jack Dongarra , and 1 more author

Procedia Computer Science, Jan 2015

Publisher: Elsevier

Bib HTML

@article{koziel_computational_2015,
  author = {Koziel, Slawomir and Leifsson, Leifur and Lees, Michael and Krzhizhanovskaya, Valeria V and Dongarra, Jack and Sloot, Peter M A},
  doi = {10.1016/j.procs.2015.05.177},
  journal = {Procedia Computer Science},
  note = {Publisher: Elsevier},
  pages = {1--8},
  title = {Computational {Science} at the {Gates} of {Nature}, {Preface} for {ICCS} 2015},
  volume = {51},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.1016/j.procs.2015.05.177}
}

SIM-CITY: An e-Science Framework for Urban Assisted Decision Support

Joris Borgdorff , Harsha Krishna , and Michael H Lees

Procedia Computer Science, Jan 2015

Publisher: Elsevier

Bib HTML

@article{borgdorff_sim-city_2015,
  author = {Borgdorff, Joris and Krishna, Harsha and Lees, Michael H},
  doi = {10.1016/j.procs.2015.05.399},
  journal = {Procedia Computer Science},
  note = {Publisher: Elsevier},
  pages = {2327--2336},
  title = {{SIM}-{CITY}: {An} e-{Science} {Framework} for {Urban} {Assisted} {Decision} {Support}},
  volume = {51},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.1016/j.procs.2015.05.399}
}

The influence of memory on indoor environment exploration: A numerical study

Vaisagh Viswanathan , Michael Lees, and Peter M A Sloot

Behavior research methods, Jan 2015

Publisher: Springer US

Bib HTML

@article{viswanathan_influence_2015,
  author = {Viswanathan, Vaisagh and Lees, Michael and Sloot, Peter M A},
  doi = {10.3758/s13428-015-0604-1},
  journal = {Behavior research methods},
  keywords = {⛔ No DOI found},
  note = {Publisher: Springer US},
  pages = {1--19},
  title = {The influence of memory on indoor environment exploration: {A} numerical study},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.3758/s13428-015-0604-1}
}

Simulating city-level airborne infectious diseases

Shan Mei , Bin Chen , Yifan Zhu , Michael Harold Lees , AV Boukhanovsky , and 1 more author

Computers, Environment and Urban Systems, Jan 2015

Publisher: Pergamon

Bib HTML

@article{mei_simulating_2015,
  author = {Mei, Shan and Chen, Bin and Zhu, Yifan and Lees, Michael Harold and Boukhanovsky, AV and Sloot, Peter MA},
  doi = {10.1016/j.compenvurbsys.2014.12.002},
  journal = {Computers, Environment and Urban Systems},
  note = {Publisher: Pergamon},
  pages = {97--105},
  title = {Simulating city-level airborne infectious diseases},
  volume = {51},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.1016/j.compenvurbsys.2014.12.002}
}

A review of interactive narrative systems and technologies: a training perspective

Linbo Luo , Wentong Cai , Suiping Zhou , Michael Lees, and Haiyan Yin

Simulation, Jan 2015

Publisher: Sage Publications Sage UK: London, England

Bib HTML

@article{luo_review_2015,
  author = {Luo, Linbo and Cai, Wentong and Zhou, Suiping and Lees, Michael and Yin, Haiyan},
  doi = {10.1177/0037549714566722},
  journal = {Simulation},
  note = {Publisher: Sage Publications Sage UK: London, England},
  number = {2},
  pages = {126--147},
  title = {A review of interactive narrative systems and technologies: a training perspective},
  volume = {91},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.1177/0037549714566722}
}

Evolving agent-based models using self-adaptive complexification

Michael Wagner , Wentong Cai , Michael H Lees , and Heiko Aydt

Journal of Computational Science, Jan 2015

Publisher: Elsevier

Bib HTML

@article{wagner_evolving_2015,
  author = {Wagner, Michael and Cai, Wentong and Lees, Michael H and Aydt, Heiko},
  doi = {10.1016/j.jocs.2015.03.005},
  journal = {Journal of Computational Science},
  note = {Publisher: Elsevier},
  pages = {351--359},
  title = {Evolving agent-based models using self-adaptive complexification},
  volume = {10},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.1016/j.jocs.2015.03.005}
}

A partition-based match making algorithm for dynamic ridesharing

Dominik Pelzer , Jiajian Xiao , Daniel Zehe , Michael H Lees , Alois C Knoll , and 1 more author

IEEE Transactions on Intelligent Transportation Systems, Jan 2015

Publisher: IEEE

Bib HTML

@article{pelzer_partition-based_2015,
  author = {Pelzer, Dominik and Xiao, Jiajian and Zehe, Daniel and Lees, Michael H and Knoll, Alois C and Aydt, Heiko},
  doi = {10.1109/tits.2015.2413453},
  journal = {IEEE Transactions on Intelligent Transportation Systems},
  note = {Publisher: IEEE},
  number = {5},
  pages = {2587--2598},
  title = {A partition-based match making algorithm for dynamic ridesharing},
  volume = {16},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.1109/tits.2015.2413453}
}

An asynchronous synchronization strategy for parallel large-scale agent-based traffic simulations

Yadong Xu , Wentong Cai , Heiko Aydt , Michael Lees, and Daniel Zehe

In Proceedings of the 3rd ACM SIGSIM Conference on Principles of Advanced Discrete Simulation , Jan 2015

Bib HTML

@inproceedings{xu_asynchronous_2015,
  author = {Xu, Yadong and Cai, Wentong and Aydt, Heiko and Lees, Michael and Zehe, Daniel},
  booktitle = {Proceedings of the 3rd {ACM} {SIGSIM} {Conference} on {Principles} of {Advanced} {Discrete} {Simulation}},
  doi = {10.1145/2769458.2769461},
  pages = {259--269},
  publisher = {ACM},
  title = {An asynchronous synchronization strategy for parallel large-scale agent-based traffic simulations},
  year = {2015},
  bdsk-url-1 = {https://doi.org/10.1145/2769458.2769461}
}

2014

Automatic rule identification for agent-based crowd models through gene expression programming

Jinghui Zhong , Linbo Luo , Wentong Cai , and Michael Lees

In 2014 international conference on Autonomous agents and multi-agent systems , May 2014

Abs Bib HTML

Agent-based modelling of human crowds has now become an important and active research field, with a wide range of applications such as military training, evacuation analysis and digital game. One of the significant and challenging tasks in agent-based crowd modelling is the design of decision rules for agents, so as to reproduce desired emergent phenomena behaviors. The common approach in agent-based crowd modelling is to design decision rules empirically based on model developers experiences and domain specific knowledge. In this paper, an evolutionary framework is proposed to automatically extract decision rules for agent-based crowd models, so as to reproduce an objective crowd behavior. To automate the rule extraction process, the problem of finding optimal decision rules from objective crowd behaviors is formulated as a symbolic regression problem. An evolutionary framework based on gene expression programming is developed to solve the problem. The proposed algorithm is tested using crowd evacuation simulations in three scenarios with differing complexity. Our results demonstrate the feasibility of the approach and shows that our algorithm is able to find decision rules for agents, which in turn can generate the prescribed macro-scale dynamics.
@inproceedings{zhong_automatic_2014, author = {Zhong, Jinghui and Luo, Linbo and Cai, Wentong and Lees, Michael}, booktitle = {2014 international conference on {Autonomous} agents and multi-agent systems}, isbn = {978-1-4503-2738-1}, keywords = {crowd simulation, agent-based modelling, decision rules, evolutionary algorithm, gene expression programming}, month = may, pages = {1125--1125--1132--1132}, publisher = {International Foundation for Autonomous Agents and Multiagent Systems}, title = {Automatic rule identification for agent-based crowd models through gene expression programming}, url = {http://dl.acm.org/citation.cfm?id=2617388.2617425}, year = {2014}, bdsk-url-1 = {http://dl.acm.org/citation.cfm?id=2617388.2617425} }
Efficient Graph-based Dynamic Load-balancing for Parallel Large-scale Agent-based Traffic Simulation

Yadong Xu , Wentong Cai , Heiko Aydt , and Michael Lees

In Proceedings of the 2014 Winter Simulation Conference , May 2014

Abs Bib HTML

One of the issues of parallelizing large-scale agent-based traffic simulations is partitioning and load-balancing. Traffic simulations are dynamic applications where the distribution of workload in the spatial domain constantly changes. Dynamic load-balancing at run-time has shown better efficiency than static partitioning in many studies. However, existing work has only focused on geographic partitioning methods which do not consider the minimization of communication overhead. In this paper, a graph-based dynamic load-balancing mechanism which minimizes the communication overhead during load-balancing operations is developed. Its efficiency is investigated in the agent-based traffic simulator SEMSim Traffic using real world traffic data. Experiment results show that it has significantly better performance than static graph partitioning methods in improving the overall speed of the simulation.
@inproceedings{xu_efficient_2014, address = {Piscataway, NJ, USA}, author = {Xu, Yadong and Cai, Wentong and Aydt, Heiko and Lees, Michael}, bdsk-url-2 = {https://doi.org/10.1109/wsc.2014.7020180}, booktitle = {Proceedings of the 2014 {Winter} {Simulation} {Conference}}, doi = {10.1109/wsc.2014.7020180}, pages = {3483--3494}, publisher = {IEEE Press}, series = {{WSC} '14}, title = {Efficient {Graph}-based {Dynamic} {Load}-balancing for {Parallel} {Large}-scale {Agent}-based {Traffic} {Simulation}}, url = {http://dl.acm.org/citation.cfm?id=2693848.2694282}, year = {2014}, bdsk-url-1 = {http://dl.acm.org/citation.cfm?id=2693848.2694282} }
The emergence of slums: A contemporary view on simulation models

Debraj Roy , Michael Harold Lees , Bharath Palavalli , Karin Pfeffer , and M.A. Peter Sloot

Environmental Modelling & Software, Sep 2014

Abs Bib HTML

The existence of slums or informal settlements is common to most cities of developing countries. Its role as single housing delivery mechanism has seriously challenged the popular notion held by policy makers, planners and architects. Today informality is a paradigm of city making and economic growth in Africa, Asia and Latin America. This paper discusses the role of computer simulation models to understand the emergence and growth of slums in developing countries. We have identified the key factors influencing the growth of slums and formulated a standardized set of criteria for evaluating slum models. The review of existing computer simulation models designed to understand slum formation and expansion enabled us to define model requirements and to identify new research questions with respect to exploring the dynamics of slums.
@article{roy_emergence_2014, author = {Roy, Debraj and Lees, Michael Harold and Palavalli, Bharath and Pfeffer, Karin and Sloot, M.A. Peter}, bdsk-url-2 = {https://doi.org/10.1016/j.envsoft.2014.05.004}, doi = {10.1016/j.envsoft.2014.05.004}, issn = {13648152}, journal = {Environmental Modelling \& Software}, keywords = {Agent based models, Cellular automata, Geographic information systems, Informal settlement, Slums}, month = sep, pages = {76--90}, title = {The emergence of slums: {A} contemporary view on simulation models}, url = {http://www.sciencedirect.com/science/article/pii/S1364815214001352}, volume = {59}, year = {2014}, bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S1364815214001352} }
Analysing the Effectiveness of Wearable Wireless Sensors in Controlling Crowd Disasters

Teo Yu Hui Angela , Vaisagh Viswanathan , Michael Lees, and Wentong Cai

Procedia Computer Science, Sep 2014

Abs Bib HTML

The Love Parade disaster in Duisberg, Germany lead to several deaths and injuries. Disasters like this occur due to the existence of high densities in a limited area. We propose a wearable electronic device that helps reduce such disasters by directing people and thus controlling the density of the crowd. We investigate the design and effectiveness of such a device through an agent based simulation using social force. We also investigate the effect of device failure and participants not paying attention in order to determine the critical number of devices and attentive participants required for the device to be effective.
@article{angela_analysing_2014, author = {Angela, Teo Yu Hui and Viswanathan, Vaisagh and Lees, Michael and Cai, Wentong}, bdsk-url-2 = {https://doi.org/10.1016/j.procs.2014.05.144}, doi = {10.1016/j.procs.2014.05.144}, issn = {18770509}, journal = {Procedia Computer Science}, keywords = {Agent Based Simulation, Crowd Simulation, Disaster Management, Wearable Electronics, Wireless Sensors}, pages = {1590--1599}, title = {Analysing the {Effectiveness} of {Wearable} {Wireless} {Sensors} in {Controlling} {Crowd} {Disasters}}, url = {http://www.sciencedirect.com/science/article/pii/S1877050914003214}, volume = {29}, year = {2014}, bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S1877050914003214} }

Evolving Agent-based Models Using Complexification Approach

Michael Wagner , Wentong Cai , Michael H. Lees , and Heiko Aydt

Procedia Computer Science, Sep 2014

Abs Bib HTML

This paper focuses on parameter search for multi-agent based models using evolutionary algorithms. Large numbers and variable dimensions of parameters require a search method which can efficiently handle a high dimensional search space. We are proposing the use of complexification as it emulates the natural way of evolution by starting with a small constrained search space and expanding it as the evolution progresses. We examined the effects of this method on an EA by evolving parameters for two multi-agent based models.

@article{wagner_evolving_2014,
  author = {Wagner, Michael and Cai, Wentong and Lees, Michael H. and Aydt, Heiko},
  bdsk-url-2 = {https://doi.org/10.1016/j.procs.2014.05.028},
  doi = {10.1016/j.procs.2014.05.028},
  issn = {18770509},
  journal = {Procedia Computer Science},
  keywords = {Agent-based Simulation, Artificial Life, Evolutionary Computing, Modelling},
  pages = {310--321},
  title = {Evolving {Agent}-based {Models} {Using} {Complexification} {Approach}},
  url = {http://www.sciencedirect.com/science/article/pii/S1877050914002051},
  volume = {29},
  year = {2014},
  bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S1877050914002051}
}

Ea-based Evacuation Planning Using Agent-based Crowd Simulation

Jinghui Zhong , Wentong Cai , Linbo Luo , and Michael Lees

In Proceedings of the 2014 Winter Simulation Conference , Sep 2014

Abs Bib HTML

Safety planning for crowd evacuation is an important and active research topic nowadays. One important issue is to devise the evacuation plans of individuals in emergency situations so as to reduce the total evacuation time. This paper proposes a novel evolutionary algorithm (EA)-based methodology, together with agent-based crowd simulation, to solve the evacuation planning problem. The proposed method features a novel segmentation strategy which divides the entire evacuation region into sub-regions based on a discriminant function. Each sub-region is assigned with an exit gate, and individuals in a sub-region will run toward the corresponding exit gate for evacuation. In this way, the evacuation planning problem is converted to a symbolic regression problem. Then an evolutionary algorithm, using agent-based crowd simulation as fitness function, is developed to search for the global optimal solution. The simulation results on different scenarios demonstrate that the proposed method is effective to reduce the evacuation time.
@inproceedings{zhong_ea-based_2014, address = {Piscataway, NJ, USA}, author = {Zhong, Jinghui and Cai, Wentong and Luo, Linbo and Lees, Michael}, bdsk-url-2 = {https://doi.org/10.1109/wsc.2014.7019906}, booktitle = {Proceedings of the 2014 {Winter} {Simulation} {Conference}}, doi = {10.1109/wsc.2014.7019906}, pages = {395--406}, publisher = {IEEE Press}, series = {{WSC} '14}, title = {Ea-based {Evacuation} {Planning} {Using} {Agent}-based {Crowd} {Simulation}}, url = {http://dl.acm.org/citation.cfm?id=2693848.2693908}, year = {2014}, bdsk-url-1 = {http://dl.acm.org/citation.cfm?id=2693848.2693908} }
Towards a data-driven approach to scenario generation for serious games

Linbo Luo , Haiyan Yin , Wentong Cai , Michael Lees, Nasri Bin Othman , and 2 more authors

Computer Animation and Virtual Worlds, May 2014

Abs Bib HTML

Serious games have recently shown great potential to be adopted in many applications, such as training and education.However, one critical challenge in developing serious games is the authoring of a large set of scenarios for differenttraining objectives. In this paper, we propose a data-driven approach to automatically generate scenarios for serious games.Compared with other scenario generation methods, our approach leverages on the simulated player performance data toconstruct the scenario evaluation function for scenario generation. To collect the player performance data, an artificialintelligence (AI) player model is designed to imitate how a human player behaves when playing scenarios. The AI playersare used to replace human players for data collection. The experiment results show that our data-driven approach providesgood prediction accuracy on scenarios training intensities. It also outperforms our previous heuristic-based approach in itscapability of generating scenarios that match closer to specified target player performance
@article{luo_towards_2014, author = {Luo, Linbo and Yin, Haiyan and Cai, Wentong and Lees, Michael and Othman, Nasri Bin and Zhou and {Suiping}}, bdsk-url-2 = {https://doi.org/10.1002/cav.1588}, doi = {10.1002/cav.1588}, issn = {15464261}, journal = {Computer Animation and Virtual Worlds}, month = may, number = {3-4}, pages = {395--404}, title = {Towards a data-driven approach to scenario generation for serious games}, url = {http://doi.wiley.com/10.1002/cav.1588}, volume = {25}, year = {2014}, bdsk-url-1 = {http://doi.wiley.com/10.1002/cav.1588} }
Quantitative comparison between crowd models for evacuation planning and evaluation

Vaisagh Viswanathan , Chong Eu Lee , Michael Harold Lees , Siew Ann Cheong , and Peter M. A. Sloot

The European Physical Journal B, Feb 2014

Abs Bib HTML

Crowd simulation is rapidly becoming a standard tool for evacuation planning and evaluation. However, the many crowd models in the literature are structurally different, and few have been rigorously calibrated against real-world egress data, especially in emergency situations. In this paper we describe a procedure to quantitatively compare different crowd models or between models and real-world data. We simulated three models: (1) the lattice gas model, (2) the social force model, and (3) the RVO2 model, and obtained the distributions of six observables: (1) evacuation time, (2) zoned evacuation time, (3) passage density, (4) total distance traveled, (5) inconvenience, and (6) flow rate. We then used the DISTATIS procedure to compute the compromise matrix of statistical distances between the three models. Projecting the three models onto the first two principal components of the compromise matrix, we find the lattice gas and RVO2 models are similar in terms of the evacuation time, passage density, and flow rates, whereas the social force and RVO2 models are similar in terms of the total distance traveled. Most importantly, we find that the zoned evacuation times of the three models to be very different from each other. Thus we propose to use this variable, if it can be measured, as the key test between different models, and also between models and the real world. Finally, we compared the model flow rates against the flow rate of an emergency evacuation during the May 2008 Sichuan earthquake, and found the social force model agrees best with this real data.
@article{viswanathan_quantitative_2014, author = {Viswanathan, Vaisagh and Lee, Chong Eu and Lees, Michael Harold and Cheong, Siew Ann and Sloot, Peter M. A.}, bdsk-url-2 = {https://doi.org/10.1140/epjb/e2014-40699-x}, doi = {10.1140/epjb/e2014-40699-x}, issn = {1434-6028}, journal = {The European Physical Journal B}, month = feb, number = {2}, pages = {27}, title = {Quantitative comparison between crowd models for evacuation planning and evaluation}, url = {http://link.springer.com/10.1140/epjb/e2014-40699-x}, volume = {87}, year = {2014}, bdsk-url-1 = {http://link.springer.com/10.1140/epjb/e2014-40699-x} }

Topology dependent epidemic spreading velocity in weighted networks

Wei Duan , Rick Quax , Michael Lees, Xiaogang Qiu , and Peter M A Sloot

Journal of Statistical Mechanics: Theory and Experiment, Feb 2014

Publisher: IOP Publishing

Bib HTML

@article{duan_topology_2014,
  author = {Duan, Wei and Quax, Rick and Lees, Michael and Qiu, Xiaogang and Sloot, Peter M A},
  doi = {10.1088/1742-5468/2014/12/p12020},
  journal = {Journal of Statistical Mechanics: Theory and Experiment},
  note = {Publisher: IOP Publishing},
  number = {12},
  pages = {P12020},
  title = {Topology dependent epidemic spreading velocity in weighted networks},
  volume = {2014},
  year = {2014},
  bdsk-url-1 = {https://doi.org/10.1088/1742-5468/2014/12/p12020}
}

2013

BIO-DEVELOPMENT OF MOTORWAY NETWORK IN THE NETHERLANDS: A SLIME MOULD APPROACH

ANDREW ADAMATZKY , MICHAEL LEES , and PETER SLOOT

Advances in Complex Systems, May 2013

Publisher: World Scientific Publishing Company

Abs Bib HTML

Plasmodium of a cellular slime mould Physarum polycephalum is a very large eukaryotic microbe visible to the unaided eye. During its foraging behavior the plasmodium spans sources of nutrients with a network of protoplasmic tubes. In this paper we attempt to address the following question: Is slime mould capable of computing transport networks? By assuming the sources of nutrients are cities and protoplasmic tubes connecting the sources are motorways, how well does the plasmodium approximate existing motorway networks? We take the Netherlands as a case study for bio-development of motorways, while it has the most dense motorway network in Europe, current demand is rapidly approaching the upper limits of existing capacity. We represent twenty major cities with oat flakes, place plasmodium in Amsterdam and record how the plasmodium spreads between oat flakes via the protoplasmic tubes. First we analyze slime-mould-built and man-built transport networks in a framework of proximity graphs to investigate if the slime mould is capable of computing existing networks. We then go on to investigate if the slime mould is able calculate or adapt the network through imitating restructuring of the transport network as a response to potential localized flooding of the Netherlands. Read More: http://www.worldscientific.com/doi/abs/10.1142/S0219525912500348?journalCode=acs
@article{adamatzky_bio-development_2013, author = {ADAMATZKY, ANDREW and LEES, MICHAEL and SLOOT, PETER}, bdsk-url-2 = {https://doi.org/10.1142/s0219525912500348}, doi = {10.1142/s0219525912500348}, issn = {0219-5259}, journal = {Advances in Complex Systems}, month = may, note = {Publisher: World Scientific Publishing Company}, number = {02n03}, pages = {1250034}, title = {{BIO}-{DEVELOPMENT} {OF} {MOTORWAY} {NETWORK} {IN} {THE} {NETHERLANDS}: {A} {SLIME} {MOULD} {APPROACH}}, url = {http://www.worldscientific.com/doi/abs/10.1142/S0219525912500348}, volume = {16}, year = {2013}, bdsk-url-1 = {http://www.worldscientific.com/doi/abs/10.1142/S0219525912500348} }

Interactive scenario generation for mission-based virtual training

Linbo Luo , Haiyan Yin , Wentong Cai , Michael Lees, and Suiping Zhou

Computer Animation and Virtual Worlds, May 2013

Bib HTML

@article{luo_interactive_2013,
  author = {Luo, Linbo and Yin, Haiyan and Cai, Wentong and Lees, Michael and Zhou, Suiping},
  bdsk-url-2 = {https://doi.org/10.1002/cav.1525},
  doi = {10.1002/cav.1525},
  issn = {15464261},
  journal = {Computer Animation and Virtual Worlds},
  month = may,
  number = {3-4},
  pages = {345--354},
  title = {Interactive scenario generation for mission-based virtual training},
  url = {http://doi.wiley.com/10.1002/cav.1525},
  volume = {24},
  year = {2013},
  bdsk-url-1 = {http://doi.wiley.com/10.1002/cav.1525}
}

PDES-MAS: Distributed Simulation of Multi-agent Systems

Vinoth Suryanarayanan , Georgios Theodoropoulos , and Michael Lees

Procedia Computer Science, May 2013

Abs Bib HTML

Multi-agent systems (MAS) are increasingly being acknowledged as a modelling paradigm for capturing the dynamics of complex systems in a wide range of domains, from system biology to adaptive socio-technical system of systems. The execution of such MAS simulations on parallel machines is a challenging problem due to their dynamic, non-deterministic, data-centric behaviour and nature. These problems are exacerbated as the scale of such MAS models increases. PDES-MAS is a distributed simulation kernel developed specifically to support MAS models addressing the problems of partitioning, load balancing and interest management in an integrated, transparent and adaptive manner. This paper presents an overview of PDES-MAS and for the first time it provides a quantitative evaluation of the system.
@article{suryanarayanan_pdes-mas_2013, author = {Suryanarayanan, Vinoth and Theodoropoulos, Georgios and Lees, Michael}, bdsk-url-2 = {https://doi.org/10.1016/j.procs.2013.05.231}, doi = {10.1016/j.procs.2013.05.231}, journal = {Procedia Computer Science}, keywords = {Agent-based systems, Distributed simulation}, pages = {671--681}, title = {{PDES}-{MAS}: {Distributed} {Simulation} of {Multi}-agent {Systems}}, url = {http://www.sciencedirect.com/science/article/pii/S1877050913003748}, volume = {18}, year = {2013}, bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S1877050913003748} }
JavaScript Distributed Agent Based Discrete Event Simulation

Daniel Zehe , Heiko Aydt , Michael Lees, and Alois Knoll

In In proceedings of the The 17th IEEE/ACM International Symposium on Distributed Simulation and Real Time Applications , Oct 2013

A pattern-based modeling framework for simulating human-like pedestrian steering behaviors

Nan Hu , Michael Harold Lees , and Suiping Zhou

In Proceedings of the 19th ACM Symposium on Virtual Reality Software and Technology - VRST ’13 , Oct 2013

Bib HTML

@inproceedings{hu_pattern-based_2013,
  address = {New York, New York, USA},
  author = {Hu, Nan and Lees, Michael Harold and Zhou, Suiping},
  bdsk-url-2 = {https://doi.org/10.1145/2503713.2503723},
  booktitle = {Proceedings of the 19th {ACM} {Symposium} on {Virtual} {Reality} {Software} and {Technology} - {VRST} '13},
  doi = {10.1145/2503713.2503723},
  isbn = {978-1-4503-2379-6},
  keywords = {agent-based simulation, cognitive modeling, emergent crowd, steering behaviors},
  month = oct,
  pages = {179},
  publisher = {ACM Press},
  title = {A pattern-based modeling framework for simulating human-like pedestrian steering behaviors},
  url = {http://dl.acm.org/citation.cfm?id=2503713.2503723},
  year = {2013},
  bdsk-url-1 = {http://dl.acm.org/citation.cfm?id=2503713.2503723}
}

A Partition Based Match Making Algorithm for Taxi Sharing

Jiajian Xiao , Heiko Aydt , Michael Lees, and Alois Knoll

In 16th International IEEE Annual Conference on Intelligent Transportation Systems , Oct 2013

Emergence by Strategy: Flocking Boids and their Fitness in Relation to Model Complexity

Michael Wagner , Wentong Cai , and Michael Lees

In Proceedings of the 2013 Winter Simulation Conference, WSC 2013, Washington D.C., USA, December 8-11, 2013 , Oct 2013

Bib HTML

@inproceedings{wagner_emergence_2013,
  author = {Wagner, Michael and Cai, Wentong and Lees, Michael},
  booktitle = {Proceedings of the 2013 {Winter} {Simulation} {Conference}, {WSC} 2013, {Washington} {D}.{C}., {USA}, {December} 8-11, 2013},
  doi = {10.1109/wsc.2013.6721532},
  title = {Emergence by {Strategy}: {Flocking} {Boids} and their {Fitness} in {Relation} to {Model} {Complexity}},
  year = {2013},
  bdsk-url-1 = {https://doi.org/10.1109/wsc.2013.6721532}
}

Spatial indexing in agent-based crowd simulation

Nasri Bin Othman , Linbo Luo , Wentong Cai , and Michael Lees

In SimuTools ’13 Proceedings of the 6th International ICST Conference on Simulation Tools and Techniques , Mar 2013

Bib HTML

@inproceedings{othman_spatial_2013,
  author = {Othman, Nasri Bin and Luo, Linbo and Cai, Wentong and Lees, Michael},
  booktitle = {{SimuTools} '13 {Proceedings} of the 6th {International} {ICST} {Conference} on {Simulation} {Tools} and {Techniques}},
  isbn = {978-1-4503-2464-9},
  keywords = {crowd simulation, agent-based simulation, performance analysis, spatial indexing},
  month = mar,
  pages = {92--100},
  publisher = {ICST (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering)},
  title = {Spatial indexing in agent-based crowd simulation},
  url = {http://dl.acm.org/citation.cfm?id=2512734.2512746},
  year = {2013},
  bdsk-url-1 = {http://dl.acm.org/citation.cfm?id=2512734.2512746}
}

A Multi-Threaded Execution Model for the Agent-based SEMSim Traffic Simulation

Heiko Aydt , Yadong Xu , Michael Lees, and Alois Knoll

In Proceedings of the 13th International Conference on Systems Simulation (AsiaSim) , Mar 2013

Bib HTML

@inproceedings{aydt_multi-threaded_2013,
  author = {Aydt, Heiko and Xu, Yadong and Lees, Michael and Knoll, Alois},
  bdsk-url-2 = {https://doi.org/10.1007/978-3-642-45037-2_1},
  booktitle = {Proceedings of the 13th {International} {Conference} on {Systems} {Simulation} ({AsiaSim})},
  doi = {10.1007/978-3-642-45037-2_1},
  pages = {1--12},
  publisher = {Springer Berlin Heidelberg},
  title = {A {Multi}-{Threaded} {Execution} {Model} for the {Agent}-based {SEMSim} {Traffic} {Simulation}},
  url = {http://link.springer.com/chapter/10.1007\%2F978-3-642-45037-2\_1\#},
  year = {2013},
  bdsk-url-1 = {http://link.springer.com/chapter/10.1007%5C%2F978-3-642-45037-2%5C_1%5C#}
}

Mission-based Scenario Modeling and Generation for Virtual Training

Linbo Luo , Haiyan Yin , Jinghui Zhong , Wentong Cai , Michael Lees, and 1 more author

In Proceedings of the Ninth Annual AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment , Oct 2013

2012

A contact-network-based simulation model for evaluating interventions under what-if scenarios in epidemic

Tianyou Zhang , Michael Lees, Chee Keong Kwoh , Xuju Fu , Gary Kee Khoon Lee , and 1 more author

In Proceedings Title: Proceedings of the 2012 Winter Simulation Conference (WSC) , Dec 2012

Backup Publisher: Winter Simulation Conference

Bib HTML

@inproceedings{zhang_contact-network-based_2012,
  author = {Zhang, Tianyou and Lees, Michael and Kwoh, Chee Keong and Fu, Xuju and Lee, Gary Kee Khoon and Goh, Rick Siow Mong},
  bdsk-url-2 = {https://doi.org/10.1109/wsc.2012.6465056},
  booktitle = {Proceedings {Title}: {Proceedings} of the 2012 {Winter} {Simulation} {Conference} ({WSC})},
  doi = {10.1109/wsc.2012.6465056},
  isbn = {978-1-4673-4782-2},
  month = dec,
  note = {Backup Publisher: Winter Simulation Conference},
  pages = {1--12},
  publisher = {IEEE},
  title = {A contact-network-based simulation model for evaluating interventions under what-if scenarios in epidemic},
  url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6465056},
  year = {2012},
  bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6465056}
}

Physarum in the Netherlands: Responding to the Flood

A Adamatzky , M H Lees , and P M A Sloot

In Bioevaluation of World Transport Networks , Dec 2012

Bib HTML

@incollection{adamatzky_physarum_2012,
  author = {Adamatzky, A and Lees, M H and Sloot, P M A},
  booktitle = {Bioevaluation of {World} {Transport} {Networks}},
  editor = {Adamatzky, A},
  pages = {1--380},
  publisher = {World Scientific},
  series = {Non {Linear} {Science}},
  title = {Physarum in the {Netherlands}: {Responding} to the {Flood}},
  url = {http://www.worldscibooks.com/chaos/8482.html},
  year = {2012},
  bdsk-url-1 = {http://www.worldscibooks.com/chaos/8482.html}
}

Evaluating temporal factors in combined interventions of workforce shift and school closure for mitigating the spread of influenza.

Tianyou Zhang , Xiuju Fu , Stefan Ma , Gaoxi Xiao , Limsoon Wong , and 4 more authors

PloS one, Jan 2012

Publisher: Public Library of Science

Abs Bib HTML

BACKGROUND: It is believed that combined interventions may be more effective than individual interventions in mitigating epidemic. However there is a lack of quantitative studies on performance of the combination of individual interventions under different temporal settings. METHODOLOGY/PRINCIPAL FINDINGS: To better understand the problem, we develop an individual-based simulation model running on top of contact networks based on real-life contact data in Singapore. We model and evaluate the spread of influenza epidemic with intervention strategies of workforce shift and its combination with school closure, and examine the impacts of temporal factors, namely the trigger threshold and the duration of an intervention. By comparing simulation results for intervention scenarios with different temporal factors, we find that combined interventions do not always outperform individual interventions and are more effective only when the duration is longer than 6 weeks or school closure is triggered at the 5% threshold; combined interventions may be more effective if school closure starts first when the duration is less than 4 weeks or workforce shift starts first when the duration is longer than 4 weeks. CONCLUSIONS/SIGNIFICANCE: We therefore conclude that identifying the appropriate timing configuration is crucial for achieving optimal or near optimal performance in mitigating the spread of influenza epidemic. The results of this study are useful to policy makers in deliberating and planning individual and combined interventions.
@article{zhang_evaluating_2012, author = {Zhang, Tianyou and Fu, Xiuju and Ma, Stefan and Xiao, Gaoxi and Wong, Limsoon and Kwoh, Chee Keong and Lees, Michael and Lee, Gary Kee Khoon and Hung, Terence}, bdsk-url-2 = {https://doi.org/10.1371/journal.pone.0032203}, doi = {10.1371/journal.pone.0032203}, issn = {1932-6203}, journal = {PloS one}, keywords = {Communicable Disease Control, Communicable Disease Control: methods, Human, Human: transmission, Humans, Influenza, Schools, Time Factors, Adult, Child, Epidemics, Epidemics: prevention \& control, Human: epidemiology, Work}, month = jan, note = {Publisher: Public Library of Science}, number = {3}, pages = {e32203}, pmid = {22403634}, title = {Evaluating temporal factors in combined interventions of workforce shift and school closure for mitigating the spread of influenza.}, url = {http://dx.plos.org/10.1371/journal.pone.0032203 http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=3293885\&tool=pmcentrez\&rendertype=abstract}, volume = {7}, year = {2012}, bdsk-url-1 = {http://dx.plos.org/10.1371/journal.pone.0032203%20http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=3293885%5C&tool=pmcentrez%5C&rendertype=abstract} }
SEMSim: A Distributed Architecture for Multi-scale Traffic Simulation

Yadong Xu , Heiko Aydt , and Michael Lees

In 2012 ACM/IEEE/SCS 26th Workshop on Principles of Advanced and Distributed Simulation , Jul 2012

Backup Publisher: IEEE Computer Society

Abs Bib HTML

With the fast urbanization of our modern society, transportation systems in cities are facing increasing problems such as congestion, collisions, and high levels of emissions. Researchers have been searching for solutions by investigating better urban planning and transportation policies, introducing new technologies such as Intelligent Transportation System (ITS), or introducing more environmentally friendly vehicles such as electric vehicles (EVs). Traffic modeling and simulation is one tool adopted by researchers for more than half a century [to help authorities assess new infrastructure design, and new policies without impacting real traffic. City-scale nanoscopic traffic simulation is a challenging problem that requires parallelization and distribution. In this paper, we have given an overview of the architecture for our nanoscopic traffic simulator SEMSim. For efficient parallel simulation, reducing the dependencies between the various LPs is crucial. We have specified a multi-objective optimization problem concerned with the allocation of agents to clusters. In our future work, we will implement a nanoscopic traffic simulation and devise methods to solve this problem dynamically. Given the difficulty of the problem, these methods will have to make use of domain-specific knowledge, such as information about the topology of the road network.
@inproceedings{xu_semsim_2012, author = {Xu, Yadong and Aydt, Heiko and Lees, Michael}, bdsk-url-2 = {https://doi.org/10.1109/pads.2012.40}, booktitle = {2012 {ACM}/{IEEE}/{SCS} 26th {Workshop} on {Principles} of {Advanced} and {Distributed} {Simulation}}, doi = {10.1109/pads.2012.40}, isbn = {978-1-4673-1797-9}, month = jul, note = {Backup Publisher: IEEE Computer Society}, pages = {178--180}, publisher = {IEEE}, title = {{SEMSim}: {A} {Distributed} {Architecture} for {Multi}-scale {Traffic} {Simulation}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6305906}, year = {2012}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6305906} }

Toward Simulation-based Egress Optimisation in Smart Buildings using Symbiotic Simulation

Heiko Aydt , Michael Lees, Stephen J Turner , and Wentong Cai

In Pedestrian Evacuation Dynamics , Jul 2012

Bib HTML

@inproceedings{aydt_toward_2012,
  author = {Aydt, Heiko and Lees, Michael and Turner, Stephen J and Cai, Wentong},
  booktitle = {Pedestrian {Evacuation} {Dynamics}},
  doi = {10.1007/978-3-319-02447-9_82},
  keywords = {⛔ No DOI found},
  title = {Toward {Simulation}-based {Egress} {Optimisation} in {Smart} {Buildings} using {Symbiotic} {Simulation}},
  year = {2012},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-319-02447-9_82}
}

Inhibition of quorum sensing in a computational biofilm simulation.

J A Fozard , M Lees , J R King , and B S Logan

Bio Systems, Aug 2012

Abs Bib HTML

Bacteria communicate through small diffusible molecules in a process known as quorum sensing. Quorum-sensing inhibitors are compounds which interfere with this, providing a potential treatment for infections associated with bacterial biofilms. We present an individual-based computational model for a developing biofilm. Cells are aggregated into particles for computational efficiency, but the quorum-sensing mechanism is modelled as a stochastic process on the level of individual cells. Simulations are used to investigate different treatment regimens. The response to the addition of inhibitor is found to depend significantly on the form of the positive feedback in the quorum-sensing model; in cases where the model exhibits bistability, the time at which treatment is initiated proves to be critical for the effective prevention of quorum sensing and hence potentially of virulence.
@article{fozard_inhibition_2012, author = {Fozard, J A and Lees, M and King, J R and Logan, B S}, bdsk-url-2 = {https://doi.org/10.1016/j.biosystems.2012.02.002}, doi = {10.1016/j.biosystems.2012.02.002}, issn = {1872-8324}, journal = {Bio Systems}, keywords = {Biofilms, Models, Quorum Sensing, Theoretical}, month = aug, number = {2}, pages = {105--14}, pmid = {22374433}, title = {Inhibition of quorum sensing in a computational biofilm simulation.}, url = {http://www.ncbi.nlm.nih.gov/pubmed/22374433}, volume = {109}, year = {2012}, bdsk-url-1 = {http://www.ncbi.nlm.nih.gov/pubmed/22374433} }

Validation of Agent-Based Simulation through Human Computation: An Example of Crowd Simulation

Pengfei Xing , Michael Lees, Hu Nan , and T Viswanthatn

In Multi-Agent-Based Simulation XII , Aug 2012

Bib HTML

@inproceedings{xing_validation_2012,
  author = {Xing, Pengfei and Lees, Michael and Nan, Hu and Viswanthatn, T},
  bdsk-url-2 = {https://doi.org/10.1007/978-3-642-28400-7_7},
  booktitle = {Multi-{Agent}-{Based} {Simulation} {XII}},
  doi = {10.1007/978-3-642-28400-7_7},
  pages = {90--102},
  publisher = {Springer Berlin/Heidelberg},
  title = {Validation of {Agent}-{Based} {Simulation} through {Human} {Computation}: {An} {Example} of {Crowd} {Simulation}},
  url = {http://www.springerlink.com/index/041016J828268762.pdf},
  year = {2012},
  bdsk-url-1 = {http://www.springerlink.com/index/041016J828268762.pdf}
}

An Information-Based Model of Pre-evacuation Behavior for Agent Based Egress Simulation

Vaisagh Viswanathan , and Michael Lees

In Pedestrian Evacuation Dynamics , Aug 2012

Bib HTML

@inproceedings{viswanathan_information-based_2012,
  author = {Viswanathan, Vaisagh and Lees, Michael},
  booktitle = {Pedestrian {Evacuation} {Dynamics}},
  doi = {10.1007/978-3-319-02447-9_8},
  keywords = {⛔ No DOI found},
  title = {An {Information}-{Based} {Model} of {Pre}-evacuation {Behavior} for {Agent} {Based} {Egress} {Simulation}},
  year = {2012},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-319-02447-9_8}
}

Simulation of City Evacuation Coupled to Flood Dynamics

Alexander Mordvintsev , Valeria Krzhizhanovskaya , Michael Lees, and Peter Sloot.

In Pedestrian Evacuation Dynamics , Aug 2012

Bib HTML

@inproceedings{mordvintsev_simulation_2012,
  author = {Mordvintsev, Alexander and Krzhizhanovskaya, Valeria and Lees, Michael and Sloot., Peter},
  booktitle = {Pedestrian {Evacuation} {Dynamics}},
  doi = {10.1007/978-3-319-02447-9_40},
  keywords = {⛔ No DOI found},
  title = {Simulation of {City} {Evacuation} {Coupled} to {Flood} {Dynamics}},
  year = {2012},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-319-02447-9_40}
}

Modeling and Analyzing the Human Cognitive Limits for Perception in Crowd Simulation

Vaisagh Viswanathan , and Michael Lees

In Transactions on Computational Science XVI , Aug 2012

Bib HTML

@inproceedings{viswanathan_modeling_2012,
  author = {Viswanathan, Vaisagh and Lees, Michael},
  booktitle = {Transactions on {Computational} {Science} {XVI}},
  doi = {10.1007/978-3-642-32663-9_4},
  pages = {55--76},
  publisher = {Springer Berlin Heidelberg},
  title = {Modeling and {Analyzing} the {Human} {Cognitive} {Limits} for {Perception} in {Crowd} {Simulation}},
  year = {2012},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-642-32663-9_4}
}

Symbiotic simulation for future electro-mobility transportation systems

Heiko Aydt , Michael Lees, and Alois Knoll

In Proceedings Title: Proceedings of the 2012 Winter Simulation Conference (WSC) , Dec 2012

Backup Publisher: Winter Simulation Conference

Abs Bib HTML

Electro-mobility is widely regarded as the future of transportation systems. The shift from fossil fuel-based engines to electro-mobility will pose new challenges to the operations of future transportation systems. Our vision of a smart transportation system for the future entails a collaborative communication and simulation infrastructure that can help to mitigate common traffic-related problems as well as problems that are specific to electric vehicles. At the core of this smart transportation system would be a symbiotic simulation system which incorporates information provided by the various traffic participants into city-scale traffic simulations. We describe the symbiotic simulation system and highlight the research challenges that need to be addressed in order to realize such a system. This includes a server-based city-scale simulation which would forecast general traffic patterns and conditions in the near-future. The outcome of these simulations can be used by server-based smart routing services and/or in-car navigation systems.
@inproceedings{aydt_symbiotic_2012, author = {Aydt, Heiko and Lees, Michael and Knoll, Alois}, bdsk-url-2 = {https://doi.org/10.1109/wsc.2012.6465312}, booktitle = {Proceedings {Title}: {Proceedings} of the 2012 {Winter} {Simulation} {Conference} ({WSC})}, doi = {10.1109/wsc.2012.6465312}, isbn = {978-1-4673-4782-2}, month = dec, note = {Backup Publisher: Winter Simulation Conference}, pages = {1--12}, publisher = {IEEE}, title = {Symbiotic simulation for future electro-mobility transportation systems}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6465312}, year = {2012}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6465312} }

Pedestrian-vehicles interaction during evacuation

M Di Mauro , M Lees , K Megawati , and Z Huang

In Pedestrian Evacuation Dynamics , Dec 2012

Bib HTML

@inproceedings{di_mauro_pedestrian-vehicles_2012,
  author = {Di Mauro, M and Lees, M and Megawati, K and Huang, Z},
  booktitle = {Pedestrian {Evacuation} {Dynamics}},
  doi = {10.1007/978-3-319-02447-9_36},
  keywords = {⛔ No DOI found},
  title = {Pedestrian-vehicles interaction during evacuation},
  year = {2012},
  bdsk-url-1 = {https://doi.org/10.1007/978-3-319-02447-9_36}
}

Grid-based partitioning for large-scale distributed agent-based crowd simulation

Yongwei Wang , Michael Lees, and Wentong Cai

In Proceedings Title: Proceedings of the 2012 Winter Simulation Conference (WSC) , Dec 2012

Backup Publisher: Winter Simulation Conference

Bib HTML

@inproceedings{wang_grid-based_2012,
  author = {Wang, Yongwei and Lees, Michael and Cai, Wentong},
  bdsk-url-2 = {https://doi.org/10.1109/wsc.2012.6465161},
  booktitle = {Proceedings {Title}: {Proceedings} of the 2012 {Winter} {Simulation} {Conference} ({WSC})},
  doi = {10.1109/wsc.2012.6465161},
  isbn = {978-1-4673-4782-2},
  month = dec,
  note = {Backup Publisher: Winter Simulation Conference},
  pages = {1--12},
  publisher = {IEEE},
  title = {Grid-based partitioning for large-scale distributed agent-based crowd simulation},
  url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6465161},
  year = {2012},
  bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6465161}
}

2011

A local hermitian RBF meshless numerical method for the solution of multi-zone problems

D Stevens , H Power , M Lees , and H Morvan

Numerical Methods for Partial Differential Equations, Sep 2011

Publisher: Wiley Subscription Services, Inc., A Wiley Company

Bib HTML

@article{stevens_local_2011,
  author = {Stevens, D and Power, H and Lees, M and Morvan, H},
  bdsk-url-2 = {https://doi.org/10.1002/num.20577},
  doi = {10.1002/num.20577},
  issn = {0749159X},
  journal = {Numerical Methods for Partial Differential Equations},
  month = sep,
  note = {Publisher: Wiley Subscription Services, Inc., A Wiley Company},
  number = {5},
  pages = {1201--1230},
  title = {A local hermitian {RBF} meshless numerical method for the solution of multi-zone problems},
  url = {http://doi.wiley.com/10.1002/num.20577},
  volume = {27},
  year = {2011},
  bdsk-url-1 = {http://doi.wiley.com/10.1002/num.20577}
}

An Information-Based Perception Model for Agent-Based Crowd and Egress Simulation

Vaisagh Viswanathan T. , and Michael Lees

In 2011 International Conference on Cyberworlds , Oct 2011

Backup Publisher: IEEE

Abs Bib HTML

One of the major components of Agent Based Crowd Simulation is motion planning. There have been various motion planning algorithms developed and they’ve become increasingly better and more efficient at calculating the most optimal path. We believe that this optimality is coming at the price of realism. Certain factors like social norms, limitations to human computation capabilities, etc. prevent humans from following their optimal path. One aspect of natural movement is related to perception and the manner in which humans process information. In this paper we propose two additions to generalmotion planning algorithms: (1) Group sensing for motion planning which results in agents avoiding clusters of other agents when choosing their collision free path. (2) Filtering of percepts based on interestingness to model limited information processing capabilities of human beings.
@inproceedings{t_information-based_2011, author = {T., Vaisagh Viswanathan and Lees, Michael}, bdsk-url-2 = {https://doi.org/10.1109/cw.2011.10}, booktitle = {2011 {International} {Conference} on {Cyberworlds}}, doi = {10.1109/cw.2011.10}, isbn = {978-1-4577-1453-5}, month = oct, note = {Backup Publisher: IEEE}, pages = {38--45}, publisher = {IEEE}, title = {An {Information}-{Based} {Perception} {Model} for {Agent}-{Based} {Crowd} and {Egress} {Simulation}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6079344}, year = {2011}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6079344} }
A Computational Model of Emotions for Agent-Based Crowds in Serious Games

Heiko Aydt , Michael Lees, Linbo Luo , Wentong Cai , Malcolm Yoke Hean Low , and 1 more author

In 2011 IEEE/WIC/ACM International Conferences on Web Intelligence and Intelligent Agent Technology , Aug 2011

Backup Publisher: IEEE

Abs Bib HTML

Crowd behaviour is an interesting social phenomenon that emerges from complex interactions of individuals. An important aspect of individual behaviour is emotion which plays a significant role in all aspects of human decision making. For example, heightened emotional states can lead people to take highly unexpected or irrational actions. One popular motivation for simulation of virtual crowds is to generate believable characters in movies and computer games. Recently the concept of serious games has been introduced in both academic and industrial circles. In this paper, we propose an emotion engine, based on modern appraisal theory, that is able to model various emotional crowd characteristics. This appraisal engine is capable of capturing the dynamics of emotional contagion and we show how different crowd composition can lead to different patterns of emotional contagion. In addition, we describe a serious game designed for training military personnel in peaceful crowd control. We evaluate this engine in the context of a property protection protest scenario where the players or soldiers are tasked to maintain a peaceful protest without violence. A systematic evaluation is presented which supports the facial validity of the emotion engine and our model of emotional contagion.
@inproceedings{aydt_computational_2011, author = {Aydt, Heiko and Lees, Michael and Luo, Linbo and Cai, Wentong and Low, Malcolm Yoke Hean and Kadirvelen, Sornum Kabilen}, bdsk-url-2 = {https://doi.org/10.1109/wi-iat.2011.154}, booktitle = {2011 {IEEE}/{WIC}/{ACM} {International} {Conferences} on {Web} {Intelligence} and {Intelligent} {Agent} {Technology}}, doi = {10.1109/wi-iat.2011.154}, isbn = {978-1-4577-1373-6}, month = aug, note = {Backup Publisher: IEEE}, pages = {72--80}, publisher = {IEEE}, title = {A {Computational} {Model} of {Emotions} for {Agent}-{Based} {Crowds} in {Serious} {Games}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6040757}, volume = {2}, year = {2011}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6040757} }

Temporal factors in school closure policy for mitigating the spread of influenza.

Tianyou Zhang , Xiuju Fu , Chee Keong Kwoh , Gaoxi Xiao , Limsoon Wong , and 5 more authors

Journal of public health policy, May 2011

Abs Bib HTML

Is school closure effective in mitigating influenza outbreaks? For Singapore, we developed an individual-based simulation model using real-life contact data. We evaluated the impacts of temporal factors - trigger threshold and duration - on the effectiveness of school closure as a mitigation policy. We found an upper bound of the duration of school closure, where further extension beyond which will not bring additional benefits to suppressing the attack rate and peak incidence. For school closure with a relatively short duration (\textless 6 weeks), it is more effective to start closure after a relatively longer delay from the first day of infection; if the duration of school closure is long (\textgreater6 weeks), however, it is better to start it as early as reasonable. Our studies reveal the critical importance of timing in school closure, especially in cost-cautious situations. Our studies also demonstrate the great potential of a properly developed individual-based simulation model in evaluating various disease control policies.

@article{zhang_temporal_2011,
  author = {Zhang, Tianyou and Fu, Xiuju and Kwoh, Chee Keong and Xiao, Gaoxi and Wong, Limsoon and Ma, Stefan and Soh, Harold and Lee, Gary Kee Khoon and Hung, Terence and Lees, Michael},
  bdsk-url-2 = {https://doi.org/10.1057/jphp.2011.1},
  doi = {10.1057/jphp.2011.1},
  issn = {1745-655X},
  journal = {Journal of public health policy},
  keywords = {Communicable Disease Control, Communicable Disease Control: methods, Community-Acquired Infections, Community-Acquired Infections: prevention \& contro, Computer Simulation, Disease Transmission, Health Policy, Human, Human: prevention \& control, Human: transmission, Humans, Infectious, Infectious: prevention \& control, Influenza, Neural Networks (Computer), Schools, Singapore, Time Factors},
  month = may,
  number = {2},
  pages = {180--97},
  pmid = {21326332},
  title = {Temporal factors in school closure policy for mitigating the spread of influenza.},
  url = {http://www.ingentaconnect.com/content/pal/jphp/2011/00000032/00000002/art00005 http://www.ncbi.nlm.nih.gov/pubmed/21326332},
  volume = {32},
  year = {2011},
  bdsk-url-1 = {http://www.ingentaconnect.com/content/pal/jphp/2011/00000032/00000002/art00005%20http://www.ncbi.nlm.nih.gov/pubmed/21326332}
}

Pattern based motion for crowd simulation

N Hu , M Lees , S Zhou , and V Viswanathan T

In Transactions on edutainment VI , May 2011

Abs Bib HTML

We present a pattern-based approach for simulating the steering behaviour of pedestrians, which aims to imitate the way that real pedestrians perceive spatial-temporal information and make steering decisions in daily-life situations. Novel representations of spatial-temporal patterns are proposed that allow modellers to intuitively and naturally specify some prototypical patterns for various steering behaviours. Based on the spatial-temporal patterns, a hierarchical pattern matching process has been developed, which simulates how pedestrians process spatial temporal information and make steering decisions. Experimental results show that this new approach is quite promising and capable of producing human-like steering. We hope that the idea presented in this paper can direct researchers in this area with a fresh perspective.
@inproceedings{hu_pattern_2011, author = {Hu, N and Lees, M and Zhou, S and Viswanathan T, V}, booktitle = {Transactions on edutainment {VI}}, doi = {10.1007/978-3-642-22639-7_11}, pages = {99--110}, publisher = {Springer}, title = {Pattern based motion for crowd simulation}, year = {2011}, bdsk-url-1 = {https://doi.org/10.1007/978-3-642-22639-7_11} }

HumDPM: A Decision Process Model for Modeling Human-like Behaviors in Time- critical and Uncertain Situation

Linbo Luo , Suiping Zhou , Wentong Cai , Michael Lees, Malcolm Yoke Hean Low , and 1 more author

In Transactions on Computational Science XII , May 2011

Issue: 1

Bib HTML

@inproceedings{luo_humdpm_2011,
  author = {Luo, Linbo and Zhou, Suiping and Cai, Wentong and Lees, Michael and Low, Malcolm Yoke Hean and Sornum, Kabilen},
  bdsk-url-2 = {https://doi.org/10.1007/978-3-642-22336-5_11},
  booktitle = {Transactions on {Computational} {Science} {XII}},
  doi = {10.1007/978-3-642-22336-5_11},
  editor = {Gavrilova Marina; Tan, C J Kenneth},
  note = {Issue: 1},
  pages = {260},
  publisher = {springer},
  title = {{HumDPM}: {A} {Decision} {Process} {Model} for {Modeling} {Human}-like {Behaviors} in {Time}- critical and {Uncertain} {Situation}},
  url = {http://link.springer.com/chapter/10.1007\%2F978-3-642-22336-5\_11},
  volume = {6670},
  year = {2011},
  bdsk-url-1 = {http://link.springer.com/chapter/10.1007%5C%2F978-3-642-22336-5%5C_11}
}

The Hermite radial basis function control volume method for multi-zones problems; A non-overlapping domain decomposition algorithm

P Orsini , H Power , and M Lees

Computer Methods in Applied Mechanics and Engineering, May 2011

Bib HTML

@article{orsini_hermite_2011,
  author = {Orsini, P and Power, H and Lees, M},
  bdsk-url-2 = {https://doi.org/10.1016/j.cma.2010.05.001},
  doi = {10.1016/j.cma.2010.05.001},
  issn = {0045-7825},
  journal = {Computer Methods in Applied Mechanics and Engineering},
  keywords = {Simultaneous interface condition},
  number = {5-8},
  pages = {477--493},
  title = {The {Hermite} radial basis function control volume method for multi-zones problems; {A} non-overlapping domain decomposition algorithm},
  url = {http://www.sciencedirect.com/science/article/pii/S004578251000143X},
  volume = {200},
  year = {2011},
  bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S004578251000143X}
}

2010

Hybrid modelling of crowd simulation

Muzhou Xiong , Michael Lees, Wentong Cai , Suiping Zhou , and Malcolm Yoke Hean Low

Procedia Computer Science, May 2010

Abs Bib HTML

Macroscopic and microscopic modeling have become mainstream methodologies for crowd simulation in dynamic environments. The two models make a trade-off between efficiency and accuracy, but neither of them is able to achieve both goals at the same time. With the aim of achieving both efficiency and accuracy, a hybrid modelling method is proposed in this paper for crowd simulation. This paper illustrates how the two types of models co-exist in a single simulation and work collaboratively. A case study for this method is also conducted, the simulation result of which shows that the proposed method can not only benefit from the macroscopic model by improving the simulation efficiency, but also obtain a fine-grained simulation result by adopting the microscopic model.
@article{xiong_hybrid_2010, author = {Xiong, Muzhou and Lees, Michael and Cai, Wentong and Zhou, Suiping and Low, Malcolm Yoke Hean}, bdsk-url-2 = {https://doi.org/10.1016/j.procs.2010.04.008}, doi = {10.1016/j.procs.2010.04.008}, journal = {Procedia Computer Science}, month = may, number = {1}, pages = {57--65}, title = {Hybrid modelling of crowd simulation}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1877050910000098}, volume = {1}, year = {2010}, bdsk-url-1 = {http://linkinghub.elsevier.com/retrieve/pii/S1877050910000098} }
Modeling Human-Like Decision Making for Virtual Agents in Time-Critical Situations

Linbo Luo , Suiping Zhou , Wentong Cai , Michael Lees, and Malcolm Yoke Hean Low

In 2010 International Conference on Cyberworlds , Oct 2010

Abs Bib HTML

Generating human-like behaviors for virtual agents has become increasingly important in many applications, such as crowd simulation, virtual training, digital entertainment, and safety planning. One of challenging issues in behavior modeling is how virtual agents make decisions given some time-critical and uncertain situations. In this paper, we present HumDPM, a decision process model for virtual agents, which incorporates two important factors of human decision making in time-critical situations: experience and emotion. In HumDPM, rather than relying on deliberate rational analysis, an agent makes its decisions by matching past experience cases to the current situation. We propose the detailed representation of experience case and investigate the mechanisms of situation assessment, experience matching and experience execution. To incorporate emotion into HumDPM, we introduce an emotion appraisal process in situation assessment for emotion elicitation. In HumDPM, the decision making process of an agent may be affected by its emotional states when: 1) deciding whether it is necessary to do a re-match of experience cases, 2) determining the situational context, and 3) selecting experience cases. We illustrate the effectiveness of HumDPM in crowd simulation. A case study for emergency evacuation in a subway station scenario is conducted, which shows how a varied crowd composition leads to different evacuation behaviors, due to the retrieval of different experiences and the variation of agents’ emotional states.
@inproceedings{luo_modeling_2010, author = {Luo, Linbo and Zhou, Suiping and Cai, Wentong and Lees, Michael and Low, Malcolm Yoke Hean}, bdsk-url-2 = {https://doi.org/10.1109/cw.2010.61}, booktitle = {2010 {International} {Conference} on {Cyberworlds}}, doi = {10.1109/cw.2010.61}, isbn = {978-1-4244-8301-3}, keywords = {crowd simulation, decision process model, del, HumDPM}, month = oct, pages = {360--367}, publisher = {IEEE}, title = {Modeling {Human}-{Like} {Decision} {Making} for {Virtual} {Agents} in {Time}-{Critical} {Situations}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5655146}, year = {2010}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5655146} }
A framework of intelligent environment with smart-active objects (IESAO) for flexible and efficient crowd simulation

Anson Yuanxi Liang , Malcolm Yoke-Hean Low , Michael Harold Lees , Wentong Cai , and Suiping Zhou

In Proceedings of the 2010 Spring Simulation Multiconference, SpringSim 2010, Orlando, Florida, USA, April 11-15, 2010 , Oct 2010

Abs Bib HTML

Agent-based crowd simulation has been widely applied in the analysis of evacuation safety under disastrous and terrorist circumstances. In crowd simulation, the virtual environment plays an important role in influencing human behavior and defining the scenario. The concepts of informed environment and smart objects have been adopted to improve the realism of the simulation by embedding semantic information in the environment. However, there is no formal approach of using these concepts in crowd simulation. In this paper, we propose a flexible and efficient framework of Intelligent Environment with Smart and Active Objects (IESAO). We properly define different types of entities and interactions, and describe the approach of modeling environment-related behavior in the intelligent environment. This framework gives a new perspective of modeling human behavior in the design phase. An implementation and a case study are discussed to show the flexibility and efficiency of this framework.
@inproceedings{liang_framework_2010, author = {Liang, Anson Yuanxi and Low, Malcolm Yoke-Hean and Lees, Michael Harold and Cai, Wentong and Zhou, Suiping}, booktitle = {Proceedings of the 2010 {Spring} {Simulation} {Multiconference}, {SpringSim} 2010, {Orlando}, {Florida}, {USA}, {April} 11-15, 2010}, doi = {10.1145/1878537.1878557}, editor = {McGraw, Robert M and Imsand, Eric S and Chinni, Michael J}, isbn = {978-1-4503-0069-8}, pages = {19}, publisher = {SCS/ACM}, title = {A framework of intelligent environment with smart-active objects ({IESAO}) for flexible and efficient crowd simulation}, year = {2010}, bdsk-url-1 = {https://doi.org/10.1145/1878537.1878557} }
Synchronization in federation community networks

Dan Chen , Stephen John Turner , Wentong Cai , Georgios K Theodoropoulos , Muzhou Xiong , and 1 more author

Journal of Parallel and Distributed Computing, Feb 2010

Abs Bib HTML

A large scale High Level Architecture (HLA)-based simulation can be constructed using a network of simulation federations to form a “federation community”. This effort is often for the sake of enhancing scalability, interoperability, composability and enabling information security. Synchronization mechanisms are essential to coordinate the execution of federates and event transmissions across the boundaries of interlinked federations. We have developed a generic synchronization mechanism for federation community networks with its correctness mathematically proved. The synchronization mechanism suits various types of federation community network and supports the reusability of legacy federates. It is platform-neutral and independent of federate modeling approaches. The synchronization mechanism has been evaluated in the context of the Grid-enabled federation community approach, which allows simulation users to benefit from both Grid computing technologies and the federation community approach. A series of experiments has been carried out to validate and benchmark the synchronization mechanism. The experimental results indicate that the proposed mechanism provides correct time management services to federation communities. The results also show that the mechanism exhibits encouraging performance in terms of synchronization efficiency and scalability.
@article{chen_synchronization_2010, author = {Chen, Dan and Turner, Stephen John and Cai, Wentong and Theodoropoulos, Georgios K and Xiong, Muzhou and Lees, Michael}, bdsk-url-2 = {https://doi.org/10.1016/j.jpdc.2009.10.006}, doi = {10.1016/j.jpdc.2009.10.006}, journal = {Journal of Parallel and Distributed Computing}, month = feb, number = {2}, pages = {144--159}, title = {Synchronization in federation community networks}, url = {http://linkinghub.elsevier.com/retrieve/pii/S074373150900210X}, volume = {70}, year = {2010}, bdsk-url-1 = {http://linkinghub.elsevier.com/retrieve/pii/S074373150900210X} }

A systematic approach for rapid 3D reconstruction from photosets

Hoai Nam Le Tran , Kabilen Sornum , Hock Soon Seah , Wentong Cai , Malcolm Yoke Hean Low , and 2 more authors

In 2010 11th International Conference on Control Automation Robotics & Vision , Dec 2010

Bib HTML

@inproceedings{le_tran_systematic_2010,
  author = {Le Tran, Hoai Nam and Sornum, Kabilen and Seah, Hock Soon and Cai, Wentong and Low, Malcolm Yoke Hean and Zhou, Suiping and Lees, Michael},
  bdsk-url-2 = {https://doi.org/10.1109/icarcv.2010.5707388},
  booktitle = {2010 11th {International} {Conference} on {Control} {Automation} {Robotics} \& {Vision}},
  doi = {10.1109/icarcv.2010.5707388},
  isbn = {978-1-4244-7814-9},
  month = dec,
  pages = {1167--1174},
  publisher = {IEEE},
  title = {A systematic approach for rapid {3D} reconstruction from photosets},
  url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5707388},
  year = {2010},
  bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5707388}
}

Analysis of an efficient rule-based motion planning system for simulating human crowds

Muzhou Xiong , Michael Lees, Wentong Cai , Suiping Zhou , and Malcolm Yoke Hean Low

The Visual Computer, Feb 2010

Abs Bib HTML

This paper proposes a rule-based motion planning system for agent-based crowd simulation, consisting of sets of rules for both collision avoidance and collision response. In order to avoid an oncoming collision, a set of rules for velocity sampling and evaluation is proposed, which aims to choose a velocity with an expected time to collision larger than a predefined threshold. In order to improve the efficiency over existing methods, the sampling procedure terminates upon finding an appropriate velocity. Moreover, the proposed motion planning system does not guarantee a collision-free movement. In case of collision, another set of rules is also defined to direct the agent to make a corresponding response. The experiment results show that the proposed approach can be applied in different scenarios, while making the simulation execution efficient.
@article{xiong_analysis_2010, author = {Xiong, Muzhou and Lees, Michael and Cai, Wentong and Zhou, Suiping and Low, Malcolm Yoke Hean}, bdsk-url-2 = {https://doi.org/10.1007/s00371-010-0421-6}, doi = {10.1007/s00371-010-0421-6}, issn = {0178-2789}, journal = {The Visual Computer}, month = feb, number = {5}, pages = {367--383}, title = {Analysis of an efficient rule-based motion planning system for simulating human crowds}, url = {http://link.springer.com/10.1007/s00371-010-0421-6}, volume = {26}, year = {2010}, bdsk-url-1 = {http://link.springer.com/10.1007/s00371-010-0421-6} }

2009

A Rule-Based Motion Planning for Crowd Simulation

Muzhou Xiong , Michael Lees, Wentong Cai , Suiping Zhou , and Malcolm Yoke Hean Low

In 2009 International Conference on CyberWorlds , Feb 2009

Abs Bib HTML

This paper proposes a rule-based motion planning system for agent-based crowd simulation, consisting of sets of rules for both collision avoidance and collision response. In order to avoid an on-coming collision, a set of rules for velocity sampling and evaluation is proposed, which aims to choose a velocity with an expected time to collision larger than a defined threshold. In order to improve the efficiency over existing methods, the sampling procedure terminates upon finding an appropriate velocity. Moreover, the proposed motion planning system does not guarantee a collision-free movement. In case of collision, another set of rules is also defined to direct the agent to make a corresponding response. The experiment results show that the proposed method can be applied into different scenarios, while making the simulation execution efficient.
@inproceedings{xiong_rule-based_2009, author = {Xiong, Muzhou and Lees, Michael and Cai, Wentong and Zhou, Suiping and Low, Malcolm Yoke Hean}, bdsk-url-2 = {https://doi.org/10.1109/cw.2009.32}, booktitle = {2009 {International} {Conference} on {CyberWorlds}}, doi = {10.1109/cw.2009.32}, editor = {Ugail, Hassan and Qahwaji, Rami and Earnshaw, Rae A and Willis, Philip J}, isbn = {978-1-4244-4864-7}, pages = {88--95}, publisher = {IEEE}, title = {A {Rule}-{Based} {Motion} {Planning} for {Crowd} {Simulation}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5279688}, year = {2009}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5279688} }

An implicit upwinding volume element method based on meshless radial basis function techniques for modelling transport phenomena

P Orsini , H Power , H Morvan , and M Lees

International Journal for Numerical Methods in Engineering, Feb 2009

Publisher: John Wiley & Sons, Ltd.

Bib HTML

@article{orsini_implicit_2009,
  author = {Orsini, P and Power, H and Morvan, H and Lees, M},
  bdsk-url-2 = {http://dx.doi.org/10.1002/nme.2682},
  doi = {10.1002/nme.2682},
  journal = {International Journal for Numerical Methods in Engineering},
  keywords = {implicit upwinding, meshless radial basis function techniques, volume element method},
  note = {Publisher: John Wiley \& Sons, Ltd.},
  number = {1},
  pages = {n/a--n/a},
  title = {An implicit upwinding volume element method based on meshless radial basis function techniques for modelling transport phenomena},
  url = {http://dx.doi.org/10.1002/nme.2682 http://doi.wiley.com/10.1002/nme.2682},
  volume = {81},
  year = {2009},
  bdsk-url-1 = {http://dx.doi.org/10.1002/nme.2682%20http://doi.wiley.com/10.1002/nme.2682}
}

Cluster based partitioning for agent-based crowd simulations

Yongwei Wang , Michael Lees, Wentong Cai , Suiping Zhou , and Malcol Low

In Proceedings of the 2009 Winter Simulation Conference (WSC) , Dec 2009

Abs Bib HTML

Simulating crowds is a challenging but important problem. There are various methodologies in the literature ranging from macroscopic numerical flow simulations to detailed, microscopic agent simulations. One key issue for all crowd simulations is scalability. Some methods address this issue through abstraction, describing global properties of homogeneous crowds. However, ideally a modeler should be able to simulate large heterogeneous crowds at fine levels of detail. We are attempting to achieve scalability through the application of distributed simulation techniques to agent-based crowd simulation. Distributed simulation, however, introduces its own challenges, in particular how to efficiently partition the load between a number of machines. In this paper we introduce a method of partitioning agents onto machines using an adapted k-means clustering algorithm. We present, validate and use an analysis tool to compare the proposed clustered partitioning approach with a series of existing methods.
@inproceedings{wang_cluster_2009, author = {Wang, Yongwei and Lees, Michael and Cai, Wentong and Zhou, Suiping and Low, Malcol}, bdsk-url-2 = {https://doi.org/10.1109/wsc.2009.5429649}, booktitle = {Proceedings of the 2009 {Winter} {Simulation} {Conference} ({WSC})}, doi = {10.1109/wsc.2009.5429649}, editor = {Dunkin, Ann and Ingalls, Ricki G and Y{\"u}cesan, Enver and Rossetti, Manuel D and Hill, Ray and Johansson, Bj{\"o}rn}, isbn = {978-1-4244-5770-0}, month = dec, pages = {1047--1058}, publisher = {IEEE}, title = {Cluster based partitioning for agent-based crowd simulations}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5429649}, year = {2009}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5429649} }

The use of PDE centres in the local RBF Hermitian method for 3D convective-diffusion problems

David Stevens , Henry Power , Michael Lees, and Herve Morvan

Journal of Computational Physics, Jul 2009

Bib HTML

@article{stevens_use_2009,
  author = {Stevens, David and Power, Henry and Lees, Michael and Morvan, Herve},
  bdsk-url-2 = {https://doi.org/10.1016/j.jcp.2009.03.025},
  doi = {10.1016/j.jcp.2009.03.025},
  journal = {Journal of Computational Physics},
  month = jul,
  number = {12},
  pages = {4606--4624},
  title = {The use of {PDE} centres in the local {RBF} {Hermitian} method for {3D} convective-diffusion problems},
  url = {http://linkinghub.elsevier.com/retrieve/pii/S0021999109001582},
  volume = {228},
  year = {2009},
  bdsk-url-1 = {http://linkinghub.elsevier.com/retrieve/pii/S0021999109001582}
}

Toward a Generic Framework for Modeling Human Behaviors in Crowd Simulation

Linbo Luo , Suiping Zhou , Wentong Cai , Malcolm Yoke Hean Low , and Michael Lees

In 2009 IEEE/WIC/ACM International Joint Conference on Web Intelligence and Intelligent Agent Technology , Jul 2009

Abs Bib HTML

This paper presents our ongoing work on modeling agents with human-like decision making and behavior execution capabilities in crowd simulation. We aim to provide a generic framework that reflects the major cognitive and physical processes as observed from human behaviors in real-life situations. The design of the framework is based on some basic assumptions and related cognitive theories on human behaviors in various real-life situations. In this paper, the cognitive architecture of our framework is presented, which emphasizes the role of experiences in human’s decision making. The paper also briefly describes the design of agent’s decision making process and presents a case study to show some results in a crowd simulation scenario.
@inproceedings{luo_toward_2009, author = {Luo, Linbo and Zhou, Suiping and Cai, Wentong and Low, Malcolm Yoke Hean and Lees, Michael}, bdsk-url-2 = {https://doi.org/10.1109/wi-iat.2009.163}, booktitle = {2009 {IEEE}/{WIC}/{ACM} {International} {Joint} {Conference} on {Web} {Intelligence} and {Intelligent} {Agent} {Technology}}, doi = {10.1109/wi-iat.2009.163}, isbn = {978-0-7695-3801-3}, pages = {275--278}, publisher = {IEEE}, title = {Toward a {Generic} {Framework} for {Modeling} {Human} {Behaviors} in {Crowd} {Simulation}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5284829}, year = {2009}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5284829} }
Analysing probabilistically constrained optimism

Michael Lees, Brian Logan , and Georgios Theodoropoulos

Concurrency and Computation: Practice and Experience, Aug 2009

Abs Bib HTML

In previous work we presented the DTRD algorithm, an optimistic synchronization algorithm for parallel discrete event simulation of multi-agent systems, and showed that it outperforms Time Warp and time windows on a range of test cases. DTRD uses a decision-theoretic model of rollback to derive an optimal time to delay read event so as to maximize the rate of LVT progression. The algorithm assumes that the inter-arrival times (both virtual and real) of events are normally distributed. In this paper we present a more detailed evaluation of the DTRD algorithm, and specifically how the performance of the algorithm is affected when the inter-arrival times do not follow the assumed distributions. Our analysis suggests that the performance of the algorithm is relatively insensitive to events whose inter-arrival times are not normally distributed. However, as the variance of event inter-arrival times increases, its performance degrades to that of Time Warp. The evaluation approach we present is generally applicable, and we sketch how a similar analysis may be performed for two other decision-theoretic optimistic synchronization algorithms.
@article{lees_analysing_2009, author = {Lees, Michael and Logan, Brian and Theodoropoulos, Georgios}, bdsk-url-2 = {https://doi.org/10.1002/cpe.1397}, doi = {10.1002/cpe.1397}, journal = {Concurrency and Computation: Practice and Experience}, month = aug, number = {11}, pages = {1467--1482}, title = {Analysing probabilistically constrained optimism}, url = {http://doi.wiley.com/10.1002/cpe.1397}, volume = {21}, year = {2009}, bdsk-url-1 = {http://doi.wiley.com/10.1002/cpe.1397} }
Multi-Agent Systems: Simulation and Applications

Georgios K Theodoropoulos , Rob Minson , Roland Ewald , and Michael Lees

In Multi-Agent Systems: Simulation and Applications , Aug 2009

Section: Simulation

A Meshless Solution Technique for the Solution of 3D Unsaturated Zone Problems, Based on Local Hermitian Interpolation with Radial Basis Functions

David Stevens , Henry Power , Michael Lees, and Herve Morvan

Transport in Porous Media, Aug 2009

Publisher: Springer Netherlands

Bib HTML

@article{stevens_meshless_2009,
  annote = {10.1007/s11242-008-9303-z},
  author = {Stevens, David and Power, Henry and Lees, Michael and Morvan, Herve},
  doi = {10.1007/s11242-008-9303-z},
  journal = {Transport in Porous Media},
  note = {Publisher: Springer Netherlands},
  number = {2},
  pages = {149--169},
  title = {A {Meshless} {Solution} {Technique} for the {Solution} of {3D} {Unsaturated} {Zone} {Problems}, {Based} on {Local} {Hermitian} {Interpolation} with {Radial} {Basis} {Functions}},
  url = {http://dx.doi.org/10.1007/s11242-008-9303-z},
  volume = {79},
  year = {2009},
  bdsk-url-1 = {http://dx.doi.org/10.1007/s11242-008-9303-z}
}

2008

Data access in distributed simulations of multi-agent systems

Dan Chen , Roland Ewald , Georgios K Theodoropoulos , Robert Minson , Ton Oguara , and 3 more authors

Journal of Systems and Software, Dec 2008

Abs Bib HTML

Distributed simulation has emerged as an important instrument for studying large-scale complex systems. Such systems inherently consist of a large number of components, which operate in a large shared state space interacting with it in highly dynamic and unpredictable ways. Optimising access to the shared state space is crucial for achieving efficient simulation executions. Data accesses may take two forms: locating data according to a set of attribute value ranges (range query) or locating a particular state variable from the given identifier (ID query and update). This paper proposes two alternative routing approaches, namely the address-based approach, which locates data according to their address information, and the range-based approach, whose operation is based on looking up attribute value range information along the paths to the destinations. The two algorithms are discussed and analysed in the context of PDES-MAS, a framework for the distributed simulation of multi-agent systems, which uses a hierarchical infrastructure to manage the shared state space. The paper introduces a generic meta-simulation framework which is used to perform a quantitative comparative analysis of the proposed algorithms under various circumstances.
@article{chen_data_2008, author = {Chen, Dan and Ewald, Roland and Theodoropoulos, Georgios K and Minson, Robert and Oguara, Ton and Lees, Michael and Logan, Brian and Uhrmacher, Adelinde M}, bdsk-url-2 = {https://doi.org/10.1016/j.jss.2008.04.041}, doi = {10.1016/j.jss.2008.04.041}, journal = {Journal of Systems and Software}, month = dec, number = {12}, pages = {2345--2360}, title = {Data access in distributed simulations of multi-agent systems}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0164121208000976}, volume = {81}, year = {2008}, bdsk-url-1 = {http://linkinghub.elsevier.com/retrieve/pii/S0164121208000976} }
Large Scale Distributed Simulation of p2p Networks

Tien Tuan Anh Dinh , Michael Lees, Georgios Theodoropoulos , and Rob Minson

In 16th Euromicro Conference on Parallel, Distributed and Network-Based Processing (PDP 2008) , Feb 2008

Abs Bib HTML

P2P systems have witnessed phenomenal development in recent years, evaluating and analysing new and existing new algorithms and techniques is a key issue for developers of p2p systems. In this context Simulation is an important tool for p2p developers. However, such systems are often very large and few existing simulators offer the ability to execute systems of real world size. In this paper we present a tool for executing large scale simulation of p2p systems which scale effectively, only limited by the amount of computational resource available (memory and CPU). This is achieved through the application of parallel discrete event simulation techniques to an existing, already scalable simulator, peersim. We show results from a case study using the chord p2p protocol, indicating good scalability both in terms of size (memory) and execution time (CPU).
@inproceedings{dinh_large_2008, author = {Dinh, Tien Tuan Anh and Lees, Michael and Theodoropoulos, Georgios and Minson, Rob}, bdsk-url-2 = {https://doi.org/10.1109/pdp.2008.67}, booktitle = {16th {Euromicro} {Conference} on {Parallel}, {Distributed} and {Network}-{Based} {Processing} ({PDP} 2008)}, doi = {10.1109/pdp.2008.67}, isbn = {978-0-7695-3089-5}, month = feb, pages = {499--507}, publisher = {IEEE}, title = {Large {Scale} {Distributed} {Simulation} of p2p {Networks}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4457163}, year = {2008}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4457163} }
Using Access Patterns to Analyze the Performance of Optimistic Synchronization Algorithms in Simulations of MAS

Michael Lees, Brian Logan , and G. Theodoropoulos

SIMULATION, Oct 2008

Abs Bib HTML

We present a detailed analysis of the performance of the Decision Theoretic Read Delay (DTRD) optimistic synchronization algorithm for simulations of multi-agent systems (MAS). We develop an abstract characterization of the access patterns found in MAS simulations based on the simulation’s degree of coupling and skew. Using this characterization, we generated stereotypical test cases which we used to compare the performance of the DTRD algorithm with that of Time Warp and time windows. To determine if the test cases reliably predict performance in a real agent simulation, we compared the predictions made by the test cases with performance results from the Boids agent simulation benchmark for a range of simulation parameters. The results indicate that the test cases are useful predictors of performance in real agent simulations, that DTRD adapts to the mixtures of coupling cases found in real agent simulations and is capable of tracking changes in coupling during the simulation.
@article{lees_using_2008, author = {Lees, Michael and Logan, Brian and Theodoropoulos, G.}, bdsk-url-2 = {https://doi.org/10.1177/0037549708096691}, doi = {10.1177/0037549708096691}, journal = {SIMULATION}, month = oct, number = {10-11}, pages = {481--492}, title = {Using {Access} {Patterns} to {Analyze} the {Performance} of {Optimistic} {Synchronization} {Algorithms} in {Simulations} of {MAS}}, url = {http://sim.sagepub.com/cgi/doi/10.1177/0037549708096691}, volume = {84}, year = {2008}, bdsk-url-1 = {http://sim.sagepub.com/cgi/doi/10.1177/0037549708096691} }

A Control Volume Radial Basis Function Techniques for the Numerical Simulation of Saturated Flows in Semi-confined Aquifer

P Orsini , H Power , M Lees , and H Morvan

Transport in Porous Media, Nov 2008

Publisher: Springer Netherlands

Bib HTML

@article{orsini_control_2008,
  annote = {10.1007/s11242-008-9304-y},
  author = {Orsini, P and Power, H and Lees, M and Morvan, H},
  bdsk-url-2 = {http://dx.doi.org/10.1007/s11242-008-9304-y},
  doi = {10.1007/s11242-008-9304-y},
  journal = {Transport in Porous Media},
  month = nov,
  note = {Publisher: Springer Netherlands},
  number = {2},
  pages = {171--196},
  title = {A {Control} {Volume} {Radial} {Basis} {Function} {Techniques} for the {Numerical} {Simulation} of {Saturated} {Flows} in {Semi}-confined {Aquifer}},
  url = {http://dx.doi.org/10.1007/s11242-008-9304-y http://link.springer.com/10.1007/s11242-008-9304-y},
  volume = {79},
  year = {2008},
  bdsk-url-1 = {http://dx.doi.org/10.1007/s11242-008-9304-y%20http://link.springer.com/10.1007/s11242-008-9304-y}
}

2007

Distributed simulation of agent-based systems with HLA

Michael Lees, Brian Logan , and Georgios Theodoropoulos

ACM Transactions on Modeling and Computer Simulation, Jul 2007

Abs Bib HTML

In this article we describe HLA_AGENT, a tool for the distributed simulation of agent-based systems, which integrates the SIM_AGENT agent toolkit and the High Level Architecture (HLA) simulator interoperability framework. HLA_AGENT offers enhanced simulation scalability and allows interoperation with other HLA-compliant simulators, promoting simulation reuse. Using a simple Tileworld example, we show how HLA_AGENT can be used to flexibly distribute a SIM_AGENT simulation so as to exploit available computing resources. We present experimental results that illustrate the performance of HLA_AGENT on a Linux cluster running a distributed version of Tileworld and compare this with the original nondistributed SIM_AGENT version.
@article{lees_distributed_2007, author = {Lees, Michael and Logan, Brian and Theodoropoulos, Georgios}, bdsk-url-2 = {https://doi.org/10.1145/1243991.1243992}, doi = {10.1145/1243991.1243992}, journal = {ACM Transactions on Modeling and Computer Simulation}, month = jul, number = {3}, pages = {11--es}, title = {Distributed simulation of agent-based systems with {HLA}}, url = {http://portal.acm.org/citation.cfm?doid=1243991.1243992}, volume = {17}, year = {2007}, bdsk-url-1 = {http://portal.acm.org/citation.cfm?doid=1243991.1243992} }
Multiscale models of bacterial populations

Michael Lees, Brian Logan , and John King

In 2007 Winter Simulation Conference , Dec 2007

Abs Bib HTML

We present a hybrid model of the interactions within (multiple-species) populations of bacteria in a developing biofilm which integrates continuum models of population processes (e.g., diffusion of substrates and signalling molecules) with individual-based models of cellular processes (notably growth, division, displacement, and up- regulation). The cell level models combine both aggregated models of continuous processes (growth, division and displacement) for small collections of cells and individual-cell level models of quorum sensing molecule (QSM) sensing, production and up-regulation which encompass both stochastic and discrete processes. The use of both aggregated and individual models of cellular processes allows the resolution of the model to be tailored for a particular modelling problem, while at the same time remaining computationally tractable.
@inproceedings{lees_multiscale_2007, author = {Lees, Michael and Logan, Brian and King, John}, bdsk-url-2 = {https://doi.org/10.1109/wsc.2007.4419684}, booktitle = {2007 {Winter} {Simulation} {Conference}}, doi = {10.1109/wsc.2007.4419684}, editor = {Henderson, Shane G and Biller, Bahar and Hsieh, Ming-Hua and Shortle, John and Tew, Jeffrey D and Barton, Russell R}, isbn = {978-1-4244-1305-8}, month = dec, pages = {881--890}, publisher = {IEEE}, title = {Multiscale models of bacterial populations}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4419684}, year = {2007}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4419684} }

BacGrid: simulations of bacteria using the grid

Michael Lees, Brian Logan , and John King

In BMC Systems Biology , May 2007

Issue: Suppl 1

Bib HTML

@inproceedings{lees_bacgrid_2007,
  author = {Lees, Michael and Logan, Brian and King, John},
  bdsk-url-2 = {https://doi.org/10.1186/1752-0509-1-s1-s5},
  booktitle = {{BMC} {Systems} {Biology}},
  doi = {10.1186/1752-0509-1-s1-s5},
  month = may,
  note = {Issue: Suppl 1},
  pages = {S5},
  title = {{BacGrid}: simulations of bacteria using the grid},
  url = {http://www.biomedcentral.com/1752-0509/1/S1/S5},
  volume = {1},
  year = {2007},
  bdsk-url-1 = {http://www.biomedcentral.com/1752-0509/1/S1/S5}
}

HLA Simulation of Agent-Based Bacterial Models

Michael Lees, Brian Logan , and John King

In Proceedings of the 2007 European Simulation Interoperability Workshop , Jun 2007

Bib HTML

@inproceedings{lees_hla_2007,
  address = {Genoa},
  annote = {07E-SIW-032},
  author = {Lees, Michael and Logan, Brian and King, John},
  booktitle = {Proceedings of the 2007 {European} {Simulation} {Interoperability} {Workshop}},
  month = jun,
  publisher = {Simulation Interoperability Standards Organisation},
  title = {{HLA} {Simulation} of {Agent}-{Based} {Bacterial} {Models}},
  url = {http://www.agents.cs.nott.ac.uk/node/87},
  year = {2007},
  bdsk-url-1 = {http://www.agents.cs.nott.ac.uk/node/87}
}

2006

Analysing Probabilistically Constrained Optimism

Michael Lees, Brian Logan , Dan Chen , Ton Oguara , and Georgios Theodoropoulos

In 2006 Tenth IEEE International Symposium on Distributed Simulation and Real-Time Applications , Jun 2006

Abs Bib HTML

Email Print Request Permissions Save to Project In previous work we presented the DTRD algorithm, an optimistic synchronisation algorithm for parallel discrete event simulation of multi-agent systems, and showed that it outperforms time warp and time windows on range of test cases. DTRD uses a decision theoretic model of rollback to derive an optimal time to delay read event so as to maximise the rate of LVT progression. The algorithm assumes that the inter-arrival times (both virtual and real) of events are normally distributed. In this paper we present a more detailed evaluation of the DTRD algorithm, and specifically how the performance of the algorithm is affected when the inter-arrival times do not follow the assumed distributions. Our analysis suggests that the performance of the algorithm is relatively insensitive to events whose inter-arrival times are not normally distributed. However as the variance of the input events increases its performance degrades to that of Time Warp. Our approach to evaluation is general, and we outline how the analysis may be applied to other decision theoretic algorithms
@inproceedings{lees_analysing_2006, author = {Lees, Michael and Logan, Brian and Chen, Dan and Oguara, Ton and Theodoropoulos, Georgios}, bdsk-url-2 = {https://doi.org/10.1109/ds-rt.2006.10}, booktitle = {2006 {Tenth} {IEEE} {International} {Symposium} on {Distributed} {Simulation} and {Real}-{Time} {Applications}}, doi = {10.1109/ds-rt.2006.10}, isbn = {0-7695-2697-7}, pages = {201--208}, publisher = {IEEE}, title = {Analysing {Probabilistically} {Constrained} {Optimism}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4020804}, year = {2006}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4020804} }
BacGrid: Large Scale Systems Biology Simulation on the Grid

Brian Logan , Michael Lees, and John King

In Winter Simulation Conference, Track on Modelling and Simulation in Computational Biology , Dec 2006
Performance Analysis of Shared Data Access Algorithms for Distributed Simulation of Multi-Agent Systems

Roland Ewald , Dan Chen , G.K. Theodoropoulos , Michael Lees, Brian Logan , and 2 more authors

In 20th Workshop on Principles of Advanced and Distributed Simulation (PADS 2006) , Dec 2006

Abs Bib HTML

Distributed simulation is an important instrument for studying multi-agent systems (MAS). Such large scale MAS simulations often have a large shared state space. Moreover, the shared state and the access pattern of agent simulations both are highly dynamic and unpredictable. Optimising access to the shared data is crucial for achieving efficient simulation executions. PDES-MAS is a framework for distributed simulation of MAS, which uses a hierarchical infrastructure to manage the shared data. In order to enable agent simulations to access distributed shared data efficiently, this paper proposes two routing algorithms, namely the address-based routing and the range-based routing. The paper introduces a meta-simulation approach to evaluate the characteristics of both solutions and provides a quantitative comparative analysis of the proposed algorithms.
@inproceedings{ewald_performance_2006, author = {Ewald, Roland and Chen, Dan and Theodoropoulos, G.K. and Lees, Michael and Logan, Brian and Oguara, Ton and Uhrmacher, A.M.}, bdsk-url-2 = {https://doi.org/10.1109/pads.2006.29}, booktitle = {20th Workshop on Principles of Advanced and Distributed Simulation (PADS 2006)}, doi = {10.1109/pads.2006.29}, isbn = {0-7695-2587-3}, pages = {29--36}, publisher = {IEEE}, title = {Performance Analysis of Shared Data Access Algorithms for Distributed Simulation of Multi-Agent Systems}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1630706}, year = {2006}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1630706} }
Agents, games and HLA

Michael Lees, Brian Logan , and G.K. Theodoropoulos

Simulation Modelling Practice and Theory, Aug 2006

Abs Bib HTML

Over the past decade, there has been a growing interest in utilising intelligent agents in computer games and virtual environments. At the same time, computer game research and development has increasingly drawn on technologies and techniques originally developed in the large scale distributed simulation community, such as the HLA IEEE standard for simulator interoperability. In this paper, we address a central issue for HLA-based games, namely the development of HLA-compliant game agents. We present hla_agent, an HLA-compliant version of the sim_agent toolkit for building cognitively rich agents. We outline the changes necessary to the sim_agent toolkit to allow integration with the HLA, and show that, given certain reasonable assumptions, all necessary code can be generated automatically from the FOM and the object class publications and subscriptions. The integration is transparent in the sense that the existing sim_agent code runs unmodified and the agents are unaware that other parts of the system are running remotely. We present some preliminary performance results, which indicate that the overhead introduced by the HLA extension is modest even for lightweight agents with limited computational requirements.
@article{lees_agents_2006, author = {Lees, Michael and Logan, Brian and Theodoropoulos, G.K.}, bdsk-url-2 = {https://doi.org/10.1016/j.simpat.2005.10.007}, doi = {10.1016/j.simpat.2005.10.007}, journal = {Simulation Modelling Practice and Theory}, month = aug, number = {6}, pages = {752--767}, title = {Agents, games and HLA}, url = {http://linkinghub.elsevier.com/retrieve/pii/S1569190X05001267}, volume = {14}, year = {2006}, bdsk-url-1 = {http://linkinghub.elsevier.com/retrieve/pii/S1569190X05001267} }
Analysing the Performance of Optimistic Synchronisation Algorithms in Simulations of Multi-Agent Systems

Michael Lees, Brian Logan , C. Dan , Ton Oguara , and G. Theodoropoulos

In 20th Workshop on Principles of Advanced and Distributed Simulation (PADS’06) , Aug 2006

Abs Bib HTML

In this paper we present a detailed analysis of the performance of the Decision Theoretic Read Delay (DTRD) optimistic synchronisation algorithm for simulations of Multi- Agent Systems. We develop an abstract characterisation of the access patterns found in MAS simulations based on the simulation’s degree of coupling and skew. Using this characterisation, we generated stereotypical test cases which we used to compare the performance of the DTRD algorithm with that of Time Warp and time windows. To determine if the test cases reliably predict performance in a real agent simulation, we compared the predictions made by the test cases with performance results from the Boids agent simulation benchmark for a range of simulation parameters. The results indicate that DTRD adapts to the mixtures of coupling cases found in real agent simulations and is capable of tracking changes in coupling during the simulation.
@inproceedings{lees_analysing_2006-1, author = {Lees, Michael and Logan, Brian and Dan, C. and Oguara, Ton and Theodoropoulos, G.}, bdsk-url-2 = {https://doi.org/10.1109/pads.2006.10}, booktitle = {20th {Workshop} on {Principles} of {Advanced} and {Distributed} {Simulation} ({PADS}'06)}, doi = {10.1109/pads.2006.10}, isbn = {0-7695-2587-3}, pages = {37--44}, publisher = {IEEE}, title = {Analysing the {Performance} of {Optimistic} {Synchronisation} {Algorithms} in {Simulations} of {Multi}-{Agent} {Systems}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1630707}, year = {2006}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1630707} }

2005

Decision-Theoretic Throttling for Optimistic Simulations of Multi-Agent Systems

Michael Lees, Brian Logan , and G. Theodoropoulos

In Ninth IEEE International Symposium on Distributed Simulation and Real-Time Applications , Aug 2005

Abs Bib HTML

In this paper we present a throttling mechanism for optimistic simulations of multi-agent systems, which delays read accesses to the shared simulation state that are likely to be rolled back. We develop a decision-theoretic model of rollback and show how this can be used to derive the optimal time to delay a read event so as to minimize the expected overall execution time of the simulation. We briefly describe an implementation of this approach in ASSK, a distributed simulation kernel developed to investigate synchronization mechanisms for MAS simulation, and report the results of preliminary experiments to evaluate the effectiveness of our approach.
@inproceedings{lees_decision-theoretic_2005, author = {Lees, Michael and Logan, Brian and Theodoropoulos, G.}, bdsk-url-2 = {https://doi.org/10.1109/distra.2005.16}, booktitle = {Ninth {IEEE} {International} {Symposium} on {Distributed} {Simulation} and {Real}-{Time} {Applications}}, doi = {10.1109/distra.2005.16}, isbn = {0-7695-2462-1}, pages = {171--178}, publisher = {IEEE}, title = {Decision-{Theoretic} {Throttling} for {Optimistic} {Simulations} of {Multi}-{Agent} {Systems}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1530667}, year = {2005}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1530667} }
An Adaptive Load Management Mechanism for Distributed Simulation of Multi-agent Systems

Dan Chen , G. Theodoropoulos , Brian Logan , and Michael Lees

In Ninth IEEE International Symposium on Distributed Simulation and Real-Time Applications , Aug 2005

Abs Bib HTML

The paper presents a load management mechanism for distributed simulations of multi-agent systems. The mechanism minimizes the cost of accessing the shared state in the distributed simulation by dynamically redistributing shared state variables according to the access pattern of the simulation model. To evaluate the effectiveness and performance of the mechanism, a series of benchmark experiments were performed using the PDES-MAS framework for distributed simulation of multi-agent systems. Although preliminary, the results indicate that the proposed mechanism significantly reduces the overall access cost of the system.
@inproceedings{chen_adaptive_2005, author = {Chen, Dan and Theodoropoulos, G. and Logan, Brian and Lees, Michael}, bdsk-url-2 = {https://doi.org/10.1109/distra.2005.9}, booktitle = {Ninth {IEEE} {International} {Symposium} on {Distributed} {Simulation} and {Real}-{Time} {Applications}}, doi = {10.1109/distra.2005.9}, isbn = {0-7695-2462-1}, pages = {179--186}, publisher = {IEEE}, title = {An {Adaptive} {Load} {Management} {Mechanism} for {Distributed} {Simulation} of {Multi}-agent {Systems}}, url = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1530668}, year = {2005}, bdsk-url-1 = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=1530668} }

2004

Time Windows in Multi-Agent Distributed Simulation

Michael Lees, Brian Logan , and Georgios Theodoropoulos

In Proceedings of the 5th EUROSIM Congress on Modelling and Simulation (EuroSim’04) , Sep 2004

Abs

In this paper we describe a method for optimistic parallel discrete event simulation for multi-agent systems. We present an adaptive metric that calculates the appropriate degree of optimism for an agent process based on the reads and writes made to the shared state by that agent. We conclude by showing how results from our investigations into the application of moving time windows in agent simulation affects future development of the adaptive metric.
Modelling Environments for Distributed Simulation

Michael Lees, Brian Logan , Rob Minson , Ton Oguara , and Georgios Theodoropoulos

In Environments for Multi-Agent Systems: Proceedings of the the First International Workshop ({E4MAS’04}) , Sep 2004

Issue: 3374

Abs Bib HTML

Decentralised, event-driven distributed simulation is particularly suitable for modelling systems with inherent asynchronous parallelism, such as agent-based systems. However the efficient simulation of multi-agent systems presents particular challenges which are not addressed by standard parallel discrete event simulation (PDES) models and techniques. PDES approaches based on the logical process paradigm assume a fixed decomposition into processes, each of which maintains its own portion of the state of the simulation. The interaction between the processes is fixed in advance and does not change during the simulation. In contrast, simulations of MAS typically have a large shared state, the agents’ environment, which is only loosely associated with any particular process. In this paper, we present a model of the shared state of a distributed MAS simulation of situated agents. We consider the problems of efficient sensing, parallel actions and action conflicts, and present preliminary work on an approach to the simulation of the environment which addresses these issues.
@inproceedings{lees_modelling_2004, author = {Lees, Michael and Logan, Brian and Minson, Rob and Oguara, Ton and Theodoropoulos, Georgios}, booktitle = {Environments for {Multi}-{Agent} {Systems}: {Proceedings} of the the {First} {International} {Workshop} (\{{E4MAS}'04\})}, doi = {10.1007/978-3-540-32259-7_8}, editor = {Weyns, Danny and Parunak, H Van Dyke and Michel, Fabien}, isbn = {3-540-24575-8}, note = {Issue: 3374}, pages = {150--167}, publisher = {Springer}, series = {{LNAI}}, title = {Modelling {Environments} for {Distributed} {Simulation}}, year = {2004}, bdsk-url-1 = {https://doi.org/10.1007/978-3-540-32259-7_8} }
Distributed Simulation of MAS

Michael Lees, Brian Logan , Rob Minson , Ton Oguara , and Georgios K Theodoropoulos

In Multi-Agent and Multi-Agent-Based Simulation, Joint Workshop MABS 2004, New York, NY, USA, July 19, 2004, Revised Selected Papers , Sep 2004

Abs Bib HTML

The efficient simulation of multi-agent systems presents particular challenges which are not addressed by current parallel discrete event simulation (PDES) models and techniques. While the modelling and simulation of agents, at least at a coarse grain, is relatively straightforward, it is harder to apply PDES approaches to the simulation of the agents’ environment. In conventional PDES approaches a system is modelled as a set of logical processes (LPs). Each LP maintains its own portion of the state of the simulation and interacts with a small number of other LPs. The interaction between the LPs is assumed to be known in advance and does not change during the simulation. In contrast, the environment of a MAS is read and updated by agent and environment LPs in ways which depend on the evolution of the simulation. As a result, MAS simulations typically have a large shared state which is not associated with any particular agent or environment LP. In [1] we proposed a new approach to the distributed simulation of MAS in which the shared state is maintained by a tree of additional logical processes called Communication Logical Processes (CLP). In this paper we refine this model by giving precise definitions of a set of operations which allow agent and environment LPs to interact with the shared state and briefly outline how these operations could be implemented by a CLP.
@inproceedings{lees_distributed_2004, author = {Lees, Michael and Logan, Brian and Minson, Rob and Oguara, Ton and Theodoropoulos, Georgios K}, booktitle = {Multi-{Agent} and {Multi}-{Agent}-{Based} {Simulation}, {Joint} {Workshop} {MABS} 2004, {New} {York}, {NY}, {USA}, {July} 19, 2004, {Revised} {Selected} {Papers}}, date-modified = {2024-04-19 21:48:08 +0200}, doi = {10.1007/978-3-540-32243-6_3}, editor = {Davidsson, Paul and Logan, Brian and Takadama, Keiki}, isbn = {3-540-25262-2}, pages = {25--36}, publisher = {Springer}, series = {Lecture {Notes} in {Computer} {Science}}, title = {Distributed {Simulation} of {MAS}}, volume = {3415}, year = {2004}, bdsk-url-1 = {https://doi.org/10.1007/978-3-540-32243-6_3} }
HLA_AGENT: Distributed Simulation of Agent-Based Systems with HLA

Michael Lees, Brian Logan , Ton Oguara , and Georgios K Theodoropoulos

In Computational Science - ICCS 2004, 4th International Conference, Krak}ó\vphantom{}w, Poland, June 6-9, 2004, Proceedings, Part III , Sep 2004

2003

Adaptive Optimistic Synchronisation for Multi-Agent Simulation

Michael Lees, Brian Logan , and Georgios Theodoropoulos

In Proceedings of the 17th European Simulation Multiconference (ESM 2003) , Sep 2003

Backup Publisher: Society for Modelling and Simulation International and Arbeitsgemeinschaft Simulation
Simulating Agent-Based Systems with HLA: The case of SIM_AGENT – Part II

Michael Lees, Brian Logan , Ton Oguara , and Georgios Theodoropoulos

In Proceedings of the 2003 European Simulation Interoperability Workshop , Jun 2003

Backup Publisher: European Office of Aerospace {R&D}

2002

Simulating Agent-Based Systems with HLA: The case of SIM_AGENT

Michael Lees, Brian Logan , and Georgios Theodoropoulos

In Proceedings of the 2002 European Simulation Interoperability Workshop , Jun 2002

Backup Publisher: European Office of Aerospace {R&D}