Stephen Chen

School of Information Technology

Associate Professor

Office: 3046 Victor Phillip Dahdaleh Building (DB)
(Formerly known as Technology Enhanced
Learning Building)
Phone: 416-736-2100 Ext: 30526
Emailsychen@yorku.ca
Primary websitewww.yorku.ca/sychen
Secondary websitewww.researchgate.net/profile/Stephen_Chen4

Funding Opportunities for Master's students:

Metaheuristics, Evolutionary Computation, Particle Swarm Optimization, Multi-Objective Optimization

Key projects and funding:

Industrial Optimization (with Acculogic), $25,000 from NSERC Engage and $135,000 from MITACS Accelerate.

More...

Colleagues and Research Projects

Area of Specialization

Information Technology

Degrees

PhD, Carnegie Mellon
BASc, Toronto


Research Interests

Information Technologies , Numerical and Combinatorial Optimization, Heuristic Search, Evolutionary Computation, Swarm Intelligence

Selected Publications

ACM DL Author-ize service Identifying and exploiting the scale of a search space in particle swarm optimization. Yasser Gonzalez-Fernandez and Stephen Chen
GECCO '14 Proceedings of the 2014 conference on Genetic and evolutionary computation

S. Chen and J. Montgomery. (2013) "Particle Swarm Optimization with Thresheld Convergence." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 510-516. IEEE Press.

A. Bolufé Röhler and S. Chen. (2014) "Extending Minimum Population Search towards Large Scale Global Optimization." Proc. 2014 IEEE Congress on Evolutionary Computation, pp 845-852. IEEE Press.

D. Howden and S. Chen. (2013) "Social Lane-Based Cognitive Model for Simulating Pedestrian Flow in Games." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 837-843. IEEE Press.

Current Research Projects

Thresheld Convergence

Summary: 
What is the fundamental theorem of heuristic search? Here's my idea, and a search technique based on it.

Description: 
Reading list on Mendeley

Multi-Swarm Systems

Summary: 
Swarms are great at regional search and convergence. Let's add some ideas on how to improve exploration.

Description: 
Reading list on Mendeley

Selected Publications

ACM DL Author-ize service Identifying and exploiting the scale of a search space in particle swarm optimization. Yasser Gonzalez-Fernandez and Stephen Chen
GECCO '14 Proceedings of the 2014 conference on Genetic and evolutionary computation

S. Chen and J. Montgomery. (2013) "Particle Swarm Optimization with Thresheld Convergence." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 510-516. IEEE Press.

A. Bolufé Röhler and S. Chen. (2014) "Extending Minimum Population Search towards Large Scale Global Optimization." Proc. 2014 IEEE Congress on Evolutionary Computation, pp 845-852. IEEE Press.

D. Howden and S. Chen. (2013) "Social Lane-Based Cognitive Model for Simulating Pedestrian Flow in Games." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 837-843. IEEE Press.

All Publications

Book Chapters

M.G. Erechtchoukova, S. Chen, and P.A. Khaiter. (2010) “Investigation of Environmental Monitoring Designs for Corporate Management Information Systems.” Corporate Environmental Management Information Systems: Advancements and Trends, pp 138-154, F. Teuteberg and J. Marx Gómez, eds. IGI Global.

S. Chen and S.F. Smith. (1999) “Putting the "Genetics" back into Genetic Algorithms (Reconsidering the Role of Crossover in Hybrid Operators).” Foundations of Genetic Algorithms 5, pp 103-116, W. Banzhaf and C. Reeves, eds. Morgan Kaufmann.

Journal Articles

S. Chen, J. Montgomery, and A. Bolufé-Röhler. (2015) "Measuring the Curse of Dimensionality and its Effects on Particle Swarm Optimization and Differential Evolution." Applied Intelligence, 42(3): 514–526.

A. Bolufé-Röhler and S. Chen. (2015) "Minimum Population Search – A Scalable Metaheuristic for Multi-modal Problems." Revista Investigación Operacional, 36(1): 85-95.

S. Chen, J. Montgomery, A. Bolufé-Röhler, Y. Gonzalez-Fernandez. (2015) "A Review of Thresheld Convergence." GECONTEC: Revista Internacional de Gestión del Conocimiento y la Tecnología, 3(1): 1-13.

S. Estévez-Velarde, A. Miotto, A. Lewis, A. Bolufé-Röhler, and S. Chen. (2014) "Acceso a Recursos de Cómputo de Alto Rendimiento Mediante Correo Electrónico." GECONTEC: Revista Internacional de Gestión del Conocimiento y la Tecnología, 2(1): 1-9.

A. Bolufé-Röhler, A. Coto-Santiesteban, M. Rosa Soto, and S. Chen. (2014) "Minimum Population Search, an Application to Molecular Docking." GECONTEC: Revista Internacional de Gestión del Conocimiento y la Tecnología, 2(3): 1-16.

R. Fournier, S. Bulusu, S. Chen, and J. Tung. (2011) "Using Swarm Intelligence for Finding Transition States and Reaction Paths." The Journal of Chemical Physics, 135, 104117.

S. Chen, B. Spotton Visano, M. Lui, and C. Lu. (2010) "Evidence and Effects of Social Referencing Investor Behaviour during Market Bubbles." IAENG International Journal of Computer Science, 37(4):359-366.

S. Chen, S. Coffey, E. Peisachovich, G. Pitt, D. Harnanansingh, W. Chen, A. Falk-Rafael, M. Reid, J. Smith, L. Beagrie, and A. Kushniruk. (2008) “Implementing Best Practice Guidelines onto Personal Digital Assistants: Preliminary Results and Lessons Learned.” The Journal on Information Technology in Healthcare; 6(1):33-41.

Conference Proceedings

D. Tamayo-Vera, A. Bolufé Röhler, and S. Chen. (2016) "Estimation Multivariate Normal Algorithm with Thresheld Convergence." Proc. 2016 IEEE Congress on Evolutionary Computation, in press. IEEE Press.

Y. Gonzalez-Fernandez and S. Chen. (2015) "Leaders and Followers – A New Metaheuristic to Avoid the Bias of Accumulated Information." Proc. 2015 IEEE Congress on Evolutionary Computation, pp 776-783. IEEE Press.

A. Bolufé Röhler, S. Fiol-Gonzalez, and S. Chen. (2015) "A Minimum Population Search Hybrid for Large Scale Global Optimization." Proc. 2015 IEEE Congress on Evolutionary Computation, pp 1958-1965. IEEE Press.

A. Piad-Morffis, S. Estévez-Velarde, A. Bolufé Röhler, J. Montgomery, and S. Chen. (2015) "Evolution Strategies with Thresheld Convergence." Proc. 2015 IEEE Congress on Evolutionary Computation, pp 2097-2104. IEEE Press.

S. Saffarpour, M.G. Erechtchoukova, P.A. Khaiter, S. Chen, and M. Heralall. (2015) "Short-term prediction of flood events in a small urbanized watershed using multi-year hydrological records." Proc. MODSIM, pp. 2234-2240.

ACM DL Author-ize service Identifying and exploiting the scale of a search space in particle swarm optimization. Yasser Gonzalez-Fernandez and Stephen Chen
GECCO '14 Proceedings of the 2014 conference on Genetic and evolutionary computation

J. Montgomery, S. Chen, Y. Gonzalez-Fernandez. (2014) "Identifying and Exploiting the Scale of a Search Space in Differential Evolution." Proc. 2014 IEEE Congress on Evolutionary Computation, pp 1427-1434. IEEE Press.

A. Bolufé Röhler and S. Chen. (2014) "Extending Minimum Population Search towards Large Scale Global Optimization." Proc. 2014 IEEE Congress on Evolutionary Computation, pp 845-852. IEEE Press.

H. Salehinejad, S. Rahnamayan, H.R. Tizhoosh, and S. Chen. (2014) "Micro-Differential Evolution with Vectorized Random Mutation Factor." Proc. 2014 IEEE Congress on Evolutionary Computation, pp 2055-2062. IEEE Press.

S. Chen and J. Montgomery. (2013) "Particle Swarm Optimization with Thresheld Convergence." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 510-516. IEEE Press.

A. Bolufé Röhler and S. Chen. (2013) "Minimum Population Search – Lessons from building a heuristic technique with two population members." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 2061-2068. IEEE Press.

A. Bolufé Röhler, S. Estévez-Velarde, A. Piad-Morffis, S. Chen, and J. Montgomery. (2013) "Differential Evolution with Thresheld Convergence." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 40-47. IEEE Press.

D. Howden and S. Chen. (2013) "Social Lane-Based Cognitive Model for Simulating Pedestrian Flow in Games." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 837-843. IEEE Press.

S. Chen, C. Xudiera, and J. Montgomery. (2012) "Simulated Annealing with Thresheld Convergence." Proc. 2012 IEEE Congress on Evolutionary Computation, pp 1946-1952. IEEE Press.

J. Montgomery and S. Chen. (2012) "A Simple Strategy for Maintaining Diversity and Reducing Crowding in Differential Evolution." Proc. 2012 IEEE Congress on Evolutionary Computation, pp 2692-2699. IEEE Press.

A. Bolufé Röhler and S. Chen. (2012) "Multi-swarm hybrid for multi-modal optimization." Proc. 2012 IEEE Congress on Evolutionary Computation, pp 1759-1766. IEEE Press.

S. Chen. (2012) "Particle Swarm Optimization with pbest Crossover." Proc. 2012 IEEE Congress on Evolutionary Computation, pp 1234-1239. IEEE Press.

J. Hettenhausen, A. Lewis, S. Chen, M. Randall, and R. Fournier. (2012) "Multi-Objective Particle Swarm Optimisation for Molecular Transition State Search." Proc. EVOLVE 2012, pp 415-430. Springer-Verlag.

ACM DL Author-ize service Selection strategies for initial positions and initial velocities in multi-optima particle swarms
Stephen Chen, James Montgomery
GECCO '11 Proceedings of the 13th annual conference on Genetic and evolutionary computation, 2011

S. Chen and J. Montgomery. (2011) “A Simple Strategy to Maintain Diversity and Reduce Crowding in Particle Swarm Optimization.” LNCS Vol. 7106: Proc. 24th Australasian Joint Conference on Artificial Intelligence, pp 281-290. Springer-Verlag.

A. Bolufé Röhler and S. Chen. (2011) "An Analysis of Sub-swarms in Multi-swarm Systems." LNCS Vol. 7106: Proc. 24th Australasian Joint Conference on Artificial Intelligence, pp 271-280. Springer-Verlag.

S. Chen, B. Spotton Visano, and M. Lui. (2010) “Quantitative Results for a Qualitative Investor Model – A Hybrid Multi-Agent Model with Social Investors.” Proc. World Congress on Engineering 2010, pp 390-394. IAENG.

J. Montgomery and S. Chen. (2010) “An Analysis of the Operation of Differential Evolution at High and Low Crossover Rates.” Proc. 2010 IEEE Congress on Evolutionary Computation, pp 881-888. IEEE Press.

S. Chen and Y. Noa Vargas. (2010) “Improving the Performance of Particle Swarms through Dimension Reductions – A Case Study with Locust Swarms.” Proc. 2010 IEEE Congress on Evolutionary Computation, pp 2950-2957. IEEE Press.

Y. Noa Vargas and S. Chen. (2010) “Particle Swarm Optimization with Resets – Improving the Balance between Exploration and Exploitation.” LNCS Vol. 6438: Proc. 9th Mexican International Conference on Artificial Intelligence, pp 371-381. Springer-Verlag.

M.G. Erechtchoukova, S. Chen, and P.A. Khaiter. (2009) “Application of Optimization Algorithms for the Improvement of Water Quality Monitoring Systems.” Proc. 4th International Symposium on Information Technologies in Environmental Engineering, pp 176-188. Springer-Verlag.

S. Chen. (2009) "Locust Swarms – A New Multi-Optima Search Technique." Proc. 2009 IEEE Congress on Evolutionary Computation, pp 1745-1752. IEEE Press.

S. Chen. (2009) "An Analysis of Locust Swarms on Large Scale Global Optimization Problems." LNCS Vol. 5865: Proc. Fourth Australian Conference on Artificial Life, pp 211-220. Springer-Verlag.

S. Chen and V. Lupien. (2009) "Optimization in Fractal and Fractured Landscapes using Locust Swarms." LNCS Vol. 5865: Proc. Fourth Australian Conference on Artificial Life, pp 232-241. Springer-Verlag.

S. Chen, J. Tien, and B. Spotton Visano. (2008) “A Hybrid Multi-Agent Model for Financial Markets.” LNCS Vol. 5027: Proc. 21st International Conference on Industrial, Engineering and Other Applications of Applied Intelligent Systems, pp 531-540. Springer-Verlag.

S. Chen, S. Razzaqi, and V. Lupien. (2007) “Towards the Automated Design of Phased Array Ultrasonic Transducers – Using Particle Swarms to find "Smart" Start Points.” LNCS Vol. 4570: Proc. 20th International Conference on Industrial, Engineering and Other Applications of Applied Intelligent Systems, pp 313-323. Springer-Verlag.

S. Chen, K. Miura, and S. Razzaqi. (2007) “Analyzing the Role of "Smart" Start Points in Coarse Search-Greedy Search.” LNCS Vol. 4828: Proc. Third Australian Conference on Artificial Life, pp 13-24. Springer-Verlag.

S. Chen, S. Razzaqi, and V. Lupien. (2006) “An Evolution Strategy for Improving the Design of Phased Array Transducers.” Proc. 2006 IEEE Congress on Evolutionary Computation, pp 2859-2863. IEEE Press.

S. Chen. (2006) “A Little Respect (for the Role of Common Components in Heuristic Search).” IFIP Vol. 218, Professional Practice in Artificial Intelligence, pp 71-80. Springer-Verlag.

S. Chen, B. Spotton Visano, and Y. Kong (2006) “Introducing Social Investors into Multi-Agent Models of Financial Markets.” LNCS Vol. 4031: Proc. 19th International Conference on Industrial, Engineering and Other Applications of Applied Intelligent Systems, pp 44-53. Springer-Verlag.

S. Chen, G. Frempong, and W.C. Cudmore. (2006) “Gesture Friendly Interfaces for Classroom Teaching with Thinking Tools.” IFIP Vol. 210, Education for the 21st Century – Impact of ICT and Digital Resources, pp 279-283. Springer-Verlag.

S. Chen and G. Pitt. (2005) “The Coordination of Parallel Search with Common Components.” LNCS Vol. 3533: Proc. 18th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert Systems, pp 619-627. Springer-Verlag.

S. Chen and G. Pitt. (2005) “Isolating the Benefits of Respect.” GECCO-05: Proc. Genetic and Evolutionary Computation Conference, pp 1601-1602. ACM.

S. Chen and S. Morris. (2005) “Iconic Programming for Flowcharts, Java, Turing, etc.” ITiCSE 2005, Proc. 10th Annual SIGCSE Conference on Innovation and Technology in Computer Science Education, pp 104-107. ACM.

S. Chen and S.F. Smith. (1999) “Introducing a New Advantage of Crossover: Commonality-Based Selection.” GECCO-99: Proc. Genetic and Evolutionary Computation Conference, pp 122-128. Morgan Kaufmann.

S. Chen and S.F. Smith. (1999) “Improving Genetic Algorithms by Search Space Reductions (with Applications to Flow Shop Scheduling).” GECCO-99: Proc. Genetic and Evolutionary Computation Conference, pp 135-140. Morgan Kaufmann.

S. Chen, C. Guerra-Salcedo, and S.F. Smith. (1999) “Non-Standard Crossover for a Standard Representation – Commonality-Based Feature Subset Selection.” GECCO-99: Proc. Genetic and Evolutionary Computation Conference, pp 129-134. Morgan Kaufmann.

S. Chen, S.F. Smith, and C. Guerra-Salcedo. (1999) “The GENIE is Out! (Who Needs Fitness to Evolve?) .” Proc. 1999 IEEE Congress on Evolutionary Computation, pp 2102-2108. IEEE Press.

C. Guerra-Salcedo, S. Chen, L.D. Whitley, and S.F. Smith. (1999) “Fast and Accurate Feature Selection Using Hybrid Genetic Strategies.” Proc. 1999 IEEE Congress on Evolutionary Computation, pp 177-184. IEEE Press.

S. Chen and S.F. Smith. (1998) “Experiments on Commonality in Sequencing Operators.” Genetic Programming 1998: Proc. Third Annual Conference, pp 471-478. Morgan Kaufmann.

S. Chen, S. Talukdar, and N. Sadeh-Koniecpol. (1993) “Job Shop Scheduling by an Asynchronous Team of Optimization Agents.” Proc. IJCAI-93 Workshop on Knowledge-based Production Planning, Scheduling, and Control, Chambery, France. August 1993.

Conference Papers

V. Lupien, S. Chen, E.-M. Rasselkorde. (2009) “Software tools for automated phased array application development.” 36th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Kingston, USA, July 2009.

E. Peisachovich, S. Coffey, A. Falk-Rafael, J. Smith, L. Beagrie, S. Chen, D. Harnanansingh, H. Laranjo, and I. Siemon. (2007) “Advancing Evidence-Based Best Nursing Practice with Hand-held Technology.” Canadian Association of Schools of Nursing Conference, Kingston, Canada. November 2007.

S. Coffey, A. Falk-Rafael, E. Peisachovich, S. Chen, L. Beagrie, D. Harnanansingh, J. Smith, H. Laranjo, J. Siemon, G. Pitt, and W. Chen. (2007) “Advancing Evidence-Based Best Nursing Practice Using Hand-Held Technology.” The Sigma Theta Tau 18th International Nursing Research Congress, Vienna, Austria. July 2007

V. Lupien, S. Chen, S. Razzaqi. (2006) “Recent Advances in Automatic Phased Array Transducer Geometrical Design.” American Society for Nondestructive Testing, 15th Annual Research Symposium, Orlando, FL. March 2006.

S. Chen. (2006) “Iconic Programming – Teaching Programming without the Syntax.” The Association for Computer Studies Educators, 8th Conference, Mississauga, Canada. November 2006.

S. Coffey, A. Kushniruk, A. Falk-Rafael, S. Chen, L. Beagrie, J. Clark, N. Johnston, L. Cicutto, and E. Borycki. (2005) “Advancing Evidence-based Nursing Practice with Handheld Technology.” Ministry of Health, Nursing Innovation Session/2005 OHA Convention, Toronto, Canada. November, 2005.

S. Chen. (2005) “Iconic Programmer: A Visualization Tool for Teaching Concepts without Context.” Leading Learning 2005, Toronto, Canada. February 2005.

Research Reports

S. Chen. (1999) “Is the Common Good? A New Perspective Developed in Genetic Algorithms.” tech. report CMU-RI-TR-99-21, Robotics Institute, Carnegie Mellon University, September, 1999.

S. Chen and S.F. Smith. (1996) “Commonality and Genetic Algorithms.” tech. report CMU-RI-TR-96-27, Robotics Institute, Carnegie Mellon University, December, 1996.


Funding Opportunities for Master's students:

Metaheuristics, Evolutionary Computation, Particle Swarm Optimization, Multi-Objective Optimization

Key projects and funding:

Industrial Optimization (with Acculogic), $25,000 from NSERC Engage and $135,000 from MITACS Accelerate.


Colleagues and Research Projects

Area of Specialization

Information Technology

Degrees

PhD, Carnegie Mellon
BASc, Toronto

Research Interests:

Information Technologies , Numerical and Combinatorial Optimization, Heuristic Search, Evolutionary Computation, Swarm Intelligence

Current Research Projects

Thresheld Convergence

Summary: 
What is the fundamental theorem of heuristic search? Here's my idea, and a search technique based on it.

Description: 
Reading list on Mendeley

Multi-Swarm Systems

Summary: 
Swarms are great at regional search and convergence. Let's add some ideas on how to improve exploration.

Description: 
Reading list on Mendeley

All Publications

Book Chapters

M.G. Erechtchoukova, S. Chen, and P.A. Khaiter. (2010) “Investigation of Environmental Monitoring Designs for Corporate Management Information Systems.” Corporate Environmental Management Information Systems: Advancements and Trends, pp 138-154, F. Teuteberg and J. Marx Gómez, eds. IGI Global.

S. Chen and S.F. Smith. (1999) “Putting the "Genetics" back into Genetic Algorithms (Reconsidering the Role of Crossover in Hybrid Operators).” Foundations of Genetic Algorithms 5, pp 103-116, W. Banzhaf and C. Reeves, eds. Morgan Kaufmann.

Journal Articles

S. Chen, J. Montgomery, and A. Bolufé-Röhler. (2015) "Measuring the Curse of Dimensionality and its Effects on Particle Swarm Optimization and Differential Evolution." Applied Intelligence, 42(3): 514–526.

A. Bolufé-Röhler and S. Chen. (2015) "Minimum Population Search – A Scalable Metaheuristic for Multi-modal Problems." Revista Investigación Operacional, 36(1): 85-95.

S. Chen, J. Montgomery, A. Bolufé-Röhler, Y. Gonzalez-Fernandez. (2015) "A Review of Thresheld Convergence." GECONTEC: Revista Internacional de Gestión del Conocimiento y la Tecnología, 3(1): 1-13.

S. Estévez-Velarde, A. Miotto, A. Lewis, A. Bolufé-Röhler, and S. Chen. (2014) "Acceso a Recursos de Cómputo de Alto Rendimiento Mediante Correo Electrónico." GECONTEC: Revista Internacional de Gestión del Conocimiento y la Tecnología, 2(1): 1-9.

A. Bolufé-Röhler, A. Coto-Santiesteban, M. Rosa Soto, and S. Chen. (2014) "Minimum Population Search, an Application to Molecular Docking." GECONTEC: Revista Internacional de Gestión del Conocimiento y la Tecnología, 2(3): 1-16.

R. Fournier, S. Bulusu, S. Chen, and J. Tung. (2011) "Using Swarm Intelligence for Finding Transition States and Reaction Paths." The Journal of Chemical Physics, 135, 104117.

S. Chen, B. Spotton Visano, M. Lui, and C. Lu. (2010) "Evidence and Effects of Social Referencing Investor Behaviour during Market Bubbles." IAENG International Journal of Computer Science, 37(4):359-366.

S. Chen, S. Coffey, E. Peisachovich, G. Pitt, D. Harnanansingh, W. Chen, A. Falk-Rafael, M. Reid, J. Smith, L. Beagrie, and A. Kushniruk. (2008) “Implementing Best Practice Guidelines onto Personal Digital Assistants: Preliminary Results and Lessons Learned.” The Journal on Information Technology in Healthcare; 6(1):33-41.

Conference Proceedings

D. Tamayo-Vera, A. Bolufé Röhler, and S. Chen. (2016) "Estimation Multivariate Normal Algorithm with Thresheld Convergence." Proc. 2016 IEEE Congress on Evolutionary Computation, in press. IEEE Press.

Y. Gonzalez-Fernandez and S. Chen. (2015) "Leaders and Followers – A New Metaheuristic to Avoid the Bias of Accumulated Information." Proc. 2015 IEEE Congress on Evolutionary Computation, pp 776-783. IEEE Press.

A. Bolufé Röhler, S. Fiol-Gonzalez, and S. Chen. (2015) "A Minimum Population Search Hybrid for Large Scale Global Optimization." Proc. 2015 IEEE Congress on Evolutionary Computation, pp 1958-1965. IEEE Press.

A. Piad-Morffis, S. Estévez-Velarde, A. Bolufé Röhler, J. Montgomery, and S. Chen. (2015) "Evolution Strategies with Thresheld Convergence." Proc. 2015 IEEE Congress on Evolutionary Computation, pp 2097-2104. IEEE Press.

S. Saffarpour, M.G. Erechtchoukova, P.A. Khaiter, S. Chen, and M. Heralall. (2015) "Short-term prediction of flood events in a small urbanized watershed using multi-year hydrological records." Proc. MODSIM, pp. 2234-2240.

ACM DL Author-ize service Identifying and exploiting the scale of a search space in particle swarm optimization. Yasser Gonzalez-Fernandez and Stephen Chen
GECCO '14 Proceedings of the 2014 conference on Genetic and evolutionary computation

J. Montgomery, S. Chen, Y. Gonzalez-Fernandez. (2014) "Identifying and Exploiting the Scale of a Search Space in Differential Evolution." Proc. 2014 IEEE Congress on Evolutionary Computation, pp 1427-1434. IEEE Press.

A. Bolufé Röhler and S. Chen. (2014) "Extending Minimum Population Search towards Large Scale Global Optimization." Proc. 2014 IEEE Congress on Evolutionary Computation, pp 845-852. IEEE Press.

H. Salehinejad, S. Rahnamayan, H.R. Tizhoosh, and S. Chen. (2014) "Micro-Differential Evolution with Vectorized Random Mutation Factor." Proc. 2014 IEEE Congress on Evolutionary Computation, pp 2055-2062. IEEE Press.

S. Chen and J. Montgomery. (2013) "Particle Swarm Optimization with Thresheld Convergence." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 510-516. IEEE Press.

A. Bolufé Röhler and S. Chen. (2013) "Minimum Population Search – Lessons from building a heuristic technique with two population members." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 2061-2068. IEEE Press.

A. Bolufé Röhler, S. Estévez-Velarde, A. Piad-Morffis, S. Chen, and J. Montgomery. (2013) "Differential Evolution with Thresheld Convergence." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 40-47. IEEE Press.

D. Howden and S. Chen. (2013) "Social Lane-Based Cognitive Model for Simulating Pedestrian Flow in Games." Proc. 2013 IEEE Congress on Evolutionary Computation, pp 837-843. IEEE Press.

S. Chen, C. Xudiera, and J. Montgomery. (2012) "Simulated Annealing with Thresheld Convergence." Proc. 2012 IEEE Congress on Evolutionary Computation, pp 1946-1952. IEEE Press.

J. Montgomery and S. Chen. (2012) "A Simple Strategy for Maintaining Diversity and Reducing Crowding in Differential Evolution." Proc. 2012 IEEE Congress on Evolutionary Computation, pp 2692-2699. IEEE Press.

A. Bolufé Röhler and S. Chen. (2012) "Multi-swarm hybrid for multi-modal optimization." Proc. 2012 IEEE Congress on Evolutionary Computation, pp 1759-1766. IEEE Press.

S. Chen. (2012) "Particle Swarm Optimization with pbest Crossover." Proc. 2012 IEEE Congress on Evolutionary Computation, pp 1234-1239. IEEE Press.

J. Hettenhausen, A. Lewis, S. Chen, M. Randall, and R. Fournier. (2012) "Multi-Objective Particle Swarm Optimisation for Molecular Transition State Search." Proc. EVOLVE 2012, pp 415-430. Springer-Verlag.

ACM DL Author-ize service Selection strategies for initial positions and initial velocities in multi-optima particle swarms
Stephen Chen, James Montgomery
GECCO '11 Proceedings of the 13th annual conference on Genetic and evolutionary computation, 2011

S. Chen and J. Montgomery. (2011) “A Simple Strategy to Maintain Diversity and Reduce Crowding in Particle Swarm Optimization.” LNCS Vol. 7106: Proc. 24th Australasian Joint Conference on Artificial Intelligence, pp 281-290. Springer-Verlag.

A. Bolufé Röhler and S. Chen. (2011) "An Analysis of Sub-swarms in Multi-swarm Systems." LNCS Vol. 7106: Proc. 24th Australasian Joint Conference on Artificial Intelligence, pp 271-280. Springer-Verlag.

S. Chen, B. Spotton Visano, and M. Lui. (2010) “Quantitative Results for a Qualitative Investor Model – A Hybrid Multi-Agent Model with Social Investors.” Proc. World Congress on Engineering 2010, pp 390-394. IAENG.

J. Montgomery and S. Chen. (2010) “An Analysis of the Operation of Differential Evolution at High and Low Crossover Rates.” Proc. 2010 IEEE Congress on Evolutionary Computation, pp 881-888. IEEE Press.

S. Chen and Y. Noa Vargas. (2010) “Improving the Performance of Particle Swarms through Dimension Reductions – A Case Study with Locust Swarms.” Proc. 2010 IEEE Congress on Evolutionary Computation, pp 2950-2957. IEEE Press.

Y. Noa Vargas and S. Chen. (2010) “Particle Swarm Optimization with Resets – Improving the Balance between Exploration and Exploitation.” LNCS Vol. 6438: Proc. 9th Mexican International Conference on Artificial Intelligence, pp 371-381. Springer-Verlag.

M.G. Erechtchoukova, S. Chen, and P.A. Khaiter. (2009) “Application of Optimization Algorithms for the Improvement of Water Quality Monitoring Systems.” Proc. 4th International Symposium on Information Technologies in Environmental Engineering, pp 176-188. Springer-Verlag.

S. Chen. (2009) "Locust Swarms – A New Multi-Optima Search Technique." Proc. 2009 IEEE Congress on Evolutionary Computation, pp 1745-1752. IEEE Press.

S. Chen. (2009) "An Analysis of Locust Swarms on Large Scale Global Optimization Problems." LNCS Vol. 5865: Proc. Fourth Australian Conference on Artificial Life, pp 211-220. Springer-Verlag.

S. Chen and V. Lupien. (2009) "Optimization in Fractal and Fractured Landscapes using Locust Swarms." LNCS Vol. 5865: Proc. Fourth Australian Conference on Artificial Life, pp 232-241. Springer-Verlag.

S. Chen, J. Tien, and B. Spotton Visano. (2008) “A Hybrid Multi-Agent Model for Financial Markets.” LNCS Vol. 5027: Proc. 21st International Conference on Industrial, Engineering and Other Applications of Applied Intelligent Systems, pp 531-540. Springer-Verlag.

S. Chen, S. Razzaqi, and V. Lupien. (2007) “Towards the Automated Design of Phased Array Ultrasonic Transducers – Using Particle Swarms to find "Smart" Start Points.” LNCS Vol. 4570: Proc. 20th International Conference on Industrial, Engineering and Other Applications of Applied Intelligent Systems, pp 313-323. Springer-Verlag.

S. Chen, K. Miura, and S. Razzaqi. (2007) “Analyzing the Role of "Smart" Start Points in Coarse Search-Greedy Search.” LNCS Vol. 4828: Proc. Third Australian Conference on Artificial Life, pp 13-24. Springer-Verlag.

S. Chen, S. Razzaqi, and V. Lupien. (2006) “An Evolution Strategy for Improving the Design of Phased Array Transducers.” Proc. 2006 IEEE Congress on Evolutionary Computation, pp 2859-2863. IEEE Press.

S. Chen. (2006) “A Little Respect (for the Role of Common Components in Heuristic Search).” IFIP Vol. 218, Professional Practice in Artificial Intelligence, pp 71-80. Springer-Verlag.

S. Chen, B. Spotton Visano, and Y. Kong (2006) “Introducing Social Investors into Multi-Agent Models of Financial Markets.” LNCS Vol. 4031: Proc. 19th International Conference on Industrial, Engineering and Other Applications of Applied Intelligent Systems, pp 44-53. Springer-Verlag.

S. Chen, G. Frempong, and W.C. Cudmore. (2006) “Gesture Friendly Interfaces for Classroom Teaching with Thinking Tools.” IFIP Vol. 210, Education for the 21st Century – Impact of ICT and Digital Resources, pp 279-283. Springer-Verlag.

S. Chen and G. Pitt. (2005) “The Coordination of Parallel Search with Common Components.” LNCS Vol. 3533: Proc. 18th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert Systems, pp 619-627. Springer-Verlag.

S. Chen and G. Pitt. (2005) “Isolating the Benefits of Respect.” GECCO-05: Proc. Genetic and Evolutionary Computation Conference, pp 1601-1602. ACM.

S. Chen and S. Morris. (2005) “Iconic Programming for Flowcharts, Java, Turing, etc.” ITiCSE 2005, Proc. 10th Annual SIGCSE Conference on Innovation and Technology in Computer Science Education, pp 104-107. ACM.

S. Chen and S.F. Smith. (1999) “Introducing a New Advantage of Crossover: Commonality-Based Selection.” GECCO-99: Proc. Genetic and Evolutionary Computation Conference, pp 122-128. Morgan Kaufmann.

S. Chen and S.F. Smith. (1999) “Improving Genetic Algorithms by Search Space Reductions (with Applications to Flow Shop Scheduling).” GECCO-99: Proc. Genetic and Evolutionary Computation Conference, pp 135-140. Morgan Kaufmann.

S. Chen, C. Guerra-Salcedo, and S.F. Smith. (1999) “Non-Standard Crossover for a Standard Representation – Commonality-Based Feature Subset Selection.” GECCO-99: Proc. Genetic and Evolutionary Computation Conference, pp 129-134. Morgan Kaufmann.

S. Chen, S.F. Smith, and C. Guerra-Salcedo. (1999) “The GENIE is Out! (Who Needs Fitness to Evolve?) .” Proc. 1999 IEEE Congress on Evolutionary Computation, pp 2102-2108. IEEE Press.

C. Guerra-Salcedo, S. Chen, L.D. Whitley, and S.F. Smith. (1999) “Fast and Accurate Feature Selection Using Hybrid Genetic Strategies.” Proc. 1999 IEEE Congress on Evolutionary Computation, pp 177-184. IEEE Press.

S. Chen and S.F. Smith. (1998) “Experiments on Commonality in Sequencing Operators.” Genetic Programming 1998: Proc. Third Annual Conference, pp 471-478. Morgan Kaufmann.

S. Chen, S. Talukdar, and N. Sadeh-Koniecpol. (1993) “Job Shop Scheduling by an Asynchronous Team of Optimization Agents.” Proc. IJCAI-93 Workshop on Knowledge-based Production Planning, Scheduling, and Control, Chambery, France. August 1993.

Conference Papers

V. Lupien, S. Chen, E.-M. Rasselkorde. (2009) “Software tools for automated phased array application development.” 36th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Kingston, USA, July 2009.

E. Peisachovich, S. Coffey, A. Falk-Rafael, J. Smith, L. Beagrie, S. Chen, D. Harnanansingh, H. Laranjo, and I. Siemon. (2007) “Advancing Evidence-Based Best Nursing Practice with Hand-held Technology.” Canadian Association of Schools of Nursing Conference, Kingston, Canada. November 2007.

S. Coffey, A. Falk-Rafael, E. Peisachovich, S. Chen, L. Beagrie, D. Harnanansingh, J. Smith, H. Laranjo, J. Siemon, G. Pitt, and W. Chen. (2007) “Advancing Evidence-Based Best Nursing Practice Using Hand-Held Technology.” The Sigma Theta Tau 18th International Nursing Research Congress, Vienna, Austria. July 2007

V. Lupien, S. Chen, S. Razzaqi. (2006) “Recent Advances in Automatic Phased Array Transducer Geometrical Design.” American Society for Nondestructive Testing, 15th Annual Research Symposium, Orlando, FL. March 2006.

S. Chen. (2006) “Iconic Programming – Teaching Programming without the Syntax.” The Association for Computer Studies Educators, 8th Conference, Mississauga, Canada. November 2006.

S. Coffey, A. Kushniruk, A. Falk-Rafael, S. Chen, L. Beagrie, J. Clark, N. Johnston, L. Cicutto, and E. Borycki. (2005) “Advancing Evidence-based Nursing Practice with Handheld Technology.” Ministry of Health, Nursing Innovation Session/2005 OHA Convention, Toronto, Canada. November, 2005.

S. Chen. (2005) “Iconic Programmer: A Visualization Tool for Teaching Concepts without Context.” Leading Learning 2005, Toronto, Canada. February 2005.

Research Reports

S. Chen. (1999) “Is the Common Good? A New Perspective Developed in Genetic Algorithms.” tech. report CMU-RI-TR-99-21, Robotics Institute, Carnegie Mellon University, September, 1999.

S. Chen and S.F. Smith. (1996) “Commonality and Genetic Algorithms.” tech. report CMU-RI-TR-96-27, Robotics Institute, Carnegie Mellon University, December, 1996.