Publications

Refereed Journal Papers

  1. R. Khogali, O. Das and K. Raahemifar: Online Dispatching and Parallel Processing Algorithms for Saving Money in Systems with Heterogeneous, Single-Buffered, Speed-scalable Processors. Applied Mathematical Modelling, Elsevier, Volume 39, Issues 5-6, March 2015, Pages 1422-1449.     

  2. S. Senthuran, A. Anpalagan,  Hyung Yun Kong, A. Karmokar and O. Das: An opportunistic channel access scheme for interweave cognitive radio systems, KICS/IEEE Journal of Communications and Networks,16(1), 2014, pp. 56 - 66.

  3. S. Senthuran, A. Anpalagan and O. Das: Throughput analysis of opportunistic overlay and underlay access strategies. IEEE Transactions on Wireless Communications, 11(6), 2012, pp. 2024-2035. 

  4. Y. Shoaib and O. Das: Web Application Performance Modeling Using Layered Queueing Networks. Electronic Notes in Theoretical Computer Science, Elsevier, 275, 2011, pp. 123-142.

  5. S. Senthuran, A. Anpalagan, O. Das: On the performance of a constellation-rotated time-spreaded space-frequency coding scheme for 4x1 MISO OFDM transceivers. Wireless Personal Communications, Springer, 60(2), 2011, pp. 251-262.

  6. G. Franks, T. Al-Omari, M. Woodside, O. Das, and S. Derisavi: Enhanced modeling and solution of layered queueing networks. IEEE Transactions on Software Engineering, 35(2), 2009, pp.148-161.

  7. S. Senthuran, A. Anpalagan and O. Das: Cooperative subcarrier and power allocation for a two-hop decode-and-forward OFCDM based relay network. IEEE Transactions on Wireless Communications, 8(9), Sept 2009, pp. 4797-4805.

  8. O. Das and C. M. Woodside: Analyzing the Effectiveness of Fault-Management Architectures in Layered Distributed Systems, Performance Evaluation, Elsevier, 56, 2004, pp. 93-120.

  9. O. Das and C. M. Woodside: Evaluating layered distributed software systems with fault-tolerant features, Performance Evaluation, Elsevier, 45 (1), 2001, pp. 57-76.

Refereed Book Chapters

  1. O. Das and C. M. Woodside: Dependability Modeling of Self-Healing Client-Server Applications. In R. De Lemos, C. Gacek, and A. Romanovsky, editors, Architecting Dependable Systems II, Lecture Notes in Computer Science (LNCS 3069), 2004, pp. 266-285. 

Refereed Conference and Workshop Papers

  1. G. Zamani and O. Das. Impact of a Fault Management Architecture on the Performance of a Component-based System. 13th European Dependable Computing Conference (EDCC 2017), Geneva, Switzerland, September 2017, 8 pages.
  2. A. Das and O. Das: Novice to Expert continuum may affect System Response Time. 39th Annual Conference of the Cognitive Science Society (CogSci 2017), poster presentation, London, UK, July 2017.

  3. A. Das and O. Das: Effect Of Human Learning On Performance Of Cloud Applications. 10th IEEE International Conference on Cloud Computing (CLOUD 2017), Hawaii, USA, June 2017, pp. 778-781.

  4. P. Sakhamuri and O. Das: Acquisition of Virtual Machines for Tiered Applications with Availability Constraints. 18th IEEE International Symposium on High-Assurance Systems Engineering (HASE 2017), Singapore, January 2017, pp. 132-135.

  5. O. Das, A. Das: Estimating Response Time Percentiles of Cloud-based Tiered Web Applications in presence of VM failures. 12th International ACM SIGSOFT Conference on the Quality of Software Architectures (QoSA 2016), Venice, Italy, April 2016, pp. 1-10.

  6. D. Chettiar, A. Das, O. Das: Performance Modeling of Cloud-based Web Systems to Estimate Response Time Distribution. Workshop on Software Architectures for Adaptive Autonomous Systems (SAAAS 2016) colocated with ISEC 2016, Goa, India, February 2016, pp. 41-46.

  7.  R. Khogali and O. Das: Cost Minimization for Scheduling Parallel, Single-threaded, Heterogeneous, Speed-scalable Processors. 19th IEEE International Conference on Parallel and Distributed Systems (ICPADS), Seoul, Korea, December 2013, pp. 265-274.

  8. R. Khogali and O. Das: Extending Battery Life of a Multi-buffered, Single-threaded Processor in a Mobile Computing Device. in SRMPDS workshop of International Conference on Parallel Processing (ICPP), Lyon, France, October 2013, pp. 817-825.

  9. R. Khogali, O. Das and K. Raahemifar: Mobile Parallel Computing Algorithms for Single-Buffered, Speed-Scalable Processors. in M2A2 workshop of IEEE International Conference on TrustCom/ISPA/IUCC, Melbourne, Australia, July 2013, pp. 1832 - 1839..
  10. Y. Shoaib and O. Das: Using Layered Bottlenecks for Virtual Machine Provisioning in the Clouds. IEEE 5th International Conference on Utility and Cloud Computing (UCC), Chicago, USA, November 2012, pp. 109-116.

  11. R. Paharsingh and O. Das: Availability Analysis in Virtual Systems, with Applications in Cloud Computing. Presented at 2nd International Workshop on Cloud Computing and Scientific Applications (CCSA), Ottawa, Canada, May 2012.

  12. R. Paharsingh and O. Das: An Availability Model of a Virtual TMR System with Applications in Cloud/Cluster Computing. IEEE 13th International Symposium on High-Assurance Systems Engineering (HASE), Florida, USA, November 2011, pp.261-268.

  13. S. Senthuran, A. Anpalagan, O. Das and H-Y. Kong: Opportunistic Channel Sharing Based on Primary User Transition Probabilities in Dual Mode Cognitive Radio Networks. IEEE International Conference on Communications (ICC), Kyoto, Japan, June 2011, pp. 1-6.

  14. S. H. Razavi and O. Das: Security Evaluation of Layered Intrusion Tolerant Systems. International Conference on Analytical and Stochastic Modelling Techniques and Applications (ASMTA), Cardiff, UK, June 2010, pp. 145-158.

  15. G. Cheng, K. Raahemifar and O. Das: Comparative Study of Heuristics for Reliability Optimization of Complex Systems. IEEE Canadian Conference on Electrical and Computer Engineering, Calgary, Canada, May 2010, pp. 1-4.

  16. S. H. Razavi, O. Das: Evaluating Security Measures of a Layered System, IEEE Toronto International Conference – Science and Technology for Humanity, Toronto, Canada, Sept 2009, pp. 296-301.

  17. S. Sikdar and O. Das: Goal Based Project Scope Determination, IEEE Toronto International Conference – Science and Technology for Humanity, Toronto, Canada, Sept 2009, pp. 415-420.

  18. M. F. Kaleem, J. Jiang and O. Das: Performance Modeling of a 3-Tiered Software System, IEEE Toronto International Conference – Science and Technology for Humanity, Toronto, Canada, Sept 2009, pp. 915-918.

  19. S. Senthuran, A. Anpalagan, O. Das and S. Khan: Effect of cooperative CSI in adaptive subcarrier allocation for OFCDM based decode-and-forward relay systems, IEEE Vehicular Technology Conference, Fall 2009.

  20. S. Senthuran, A. Anpalagan and O. Das: Cooperative power allocation schemes and BER performance in decode-and-forward OFCDM based relay networks, IEEE Vehicular Technology Conference, Fall 2009.

  21. S. Senthuran, A. Anpalagan and O. Das: A predictive opportunistic access scheme for cognitive radios, IEEE Vehicular Technology Conference, Fall 2009.

  22. A. Das and O. Das: Performability Of Layered Systems – Models And Methods, International Conference on Software Technology and Engineering (ICSTE 2009), July 2009, pp. 189-193.

  23. M. Shaik, O. Das, L. Zhao and Z. Liao: Inter-Vehicle Range Smoothing for NLOS Condition in the Persistence of GPS Outages, 4th IEEE Conference on Industrial Electronics and Applications (ICIEA), May 2009, pp. 3904-3909.

  24. S. Senthuran, A. Anpalagan and O. Das: A quasi-orthogonal space-frequency coded OFDM system with time spreading and constellation rotation, IEEE Canadian Conference on Electrical and Computer Engineering: Communications Symposium, St. John’s, Canada, May 2009, pp. 739-744.

  25. S. Sikdar, O. Das: Stakeholder Appropriate Requirement Development Approach, IEEE International Advance Computing Conference (IACC 2009), March 2009, pp. 1670 - 1674.

  26. S. Senthuran, A. Anpalagan and O. Das: Performance analysis of time spreaded quasi-orthogonal space-frequency coded OFDM systems. IEEE Biennial Symposium on Communications, June 2008, pp.182-186.

  27. S. Sikdar and O. Das: Case For Enriching Developer's Toolkit with Goal Oriented Requirement Methodologies. IEEE Canadian Conference on Electrical and Computer Engineering, Niagara Falls, Canada, May 2008, pp. 743-746.

  28. O. Das and A. Das: Fault-tree Based Evaluation of Tiered Autonomic Systems. IEEE Canadian Conference on Electrical and Computer Engineering, Niagara Falls, Canada, May 2008, pp. 1477-1482.

  29. O. Das and A. Das: Performability Evaluation of Mobile Client-Server Systems. Proceedings of 23rd ACM Symposium on Applied Computing (ACM SAC 2008), Dependable and Adaptive Distributed Systems Track, Ceara, Brazil, March 2008, pp. 2197-2201. 

  30. J. Patel and O. Das: A New Model For Evaluating Performability Under The Effects Of Software Aging And Rejuvenation, in 11th IASTED International Conference on Software Engineering and Applications, Cambridge, Massachusetts, USA, November 2007, pp. 25-30.

  31. O. Das and A. Das: Modeling the Availability of Client-Server Autonomic Systems, In CASCON 4th International Workshop on Engineering Autonomic Software Systems, Toronto, Canada, October 2007.

  32. R. Castelino, A. El Kaffas, O. Falou and O. Das: Modeling of an Iterated Birth/death Markov Process for Optimization of Radiotherapy Treatment Planning, In Proc. IEEE Canadian Conference on Electrical and Computer Engineering, Ottawa, Canada, May 2006, pp. 1385 - 1388.

  33. O. Das: Dependability Modeling of Clustered J2EE Applications, 16th IEEE International Symposium on Software Reliability Engineering (ISSRE'05), Nov. 2005, pp. 4.10-4.11.

  34. O. Das and C. M. Woodside: Computing the Performability of Layered Distributed Systems with a Management Architecture, ACM Fourth International Workshop on Software and Performance (WOSP 2004), Redwood City, California, USA, Jan 2004, pp. 174-185.

  35. O. Das and C. M. Woodside: The Influence of Layered System Structure on Strategies for Software Rejuvenation, Sixth International Workshop on Performability Modeling of Computer and Communication Systems (PMCCS-6), Monticello, Illinois, USA, Sept. 2003, pp. 47-50.

  36. O. Das and C. M. Woodside: Layered Dependability Modeling of an Air Traffic Control System, IEEE International Conference on Software Engineering (ICSE 2003) Workshop on Architecting Dependable Systems, Portland, Oregon, USA, May 2003, pp. 50-55.

  37. O. Das and C. M. Woodside: Modeling the Coverage and Effectiveness of Fault-Management Architectures in Layered Distributed Systems, IEEE International Conference on Dependable Systems and Networks (DSN 2002), Bethesda, Maryland, June 2002, pp. 745-754.

  38. O. Das and C. M. Woodside: Evaluation of Dependable Layered Systems with Fault Management Architecture, IEEE International Conference on Software Engineering (ICSE 2002) Workshop on Architecting Dependable Systems, Orlando, Florida, May 2002, pp. 49-53.

  39. O. Das and C. M. Woodside: Failure Detection and Recovery Modelling for Multi-layered Service Systems, Fifth International Workshop on Performability Modeling of Computer and Communication Systems (PMCCS-5), Erlangen, Germany, Sept. 2001, pp. 131-135.

  40. O. Das, C. M. Woodside: The Fault-Tolerant Layered Queueing Network Model for Performability of Distributed Systems, IEEE International Performance and Dependability Symposium (IPDS 98), Durham, North Carolina, Sept. 1998, pp 132-141. (Cited in the book Performability Modelling: Techniques and Tools, edited by B. R. Haverkort, R. Marie, G. Rubino and K. S. Trivedi, John Wiley, pp. 235, Year of edition 2001).


Other Articles (Abstracts, Posters, Tool descriptions, Non-refereed papers, etc.)

  • M. Rodrigues, R. Castelino, O. Falou, O. Das, A. El Kaffas, E. Galiano: Modeling Conventional Radiotherapy Clonogenic Cell Survival for a Non-specific Tumour type using an iterated Birth-Death Markov Process. Journal Abstract, Radiotherapy and Oncology, 84, Supplement 2, S78, 2007.
  • M. Rodrigues, R. Costelino, O. Falou, O. Das, A. El Kaffas, E. Galiano: Modeling Conventional Radiotherapy Clonogenic Cell Survival for a Non-specific Tumour Type Using an Iterated Birth-Death Markov Process. Oral Presentation, Canadian Association of Radiation Oncology-Canadian Organization of Medical Physicists (CARO-COMP) 2007, October 2007.
  • E. Galiano, R. Castelino, O. Falou, A. El Kaffas, M. Rodrigues, O. Das: Modeling of an Iterated Birth/Death Markov Process for Optimization of Radiotherapy  Treatment Planning. Conference Abstract, Canadian Association of Physicists (CAP) Congress 2007, June 2007.

  • S. Senthuran, A. Anpalagan and O. Das: Downlink MIMO-OFDM Resource Allocation. Proc. International Conference for Upcoming Engineers (ICUE), Ryerson University,  May 2007.
  • S. Senthuran, S. Beheshti, A. Anpalagan and O. Das: Review of Power Control Techniques using Kalman Filter in Wireless Communication, Proc. International Conference for Upcoming Engineers (ICUE), Ryerson University,  May 2007.
  • J. Patel and O. Das: Evaluating Performability of Layered Distributed Systems under the Effects of Software Aging and Rejuvenation, Proc. International Conference for Upcoming Engineers (ICUE), Ryerson University,  May 2007.
  • R. Castelino et al. and O. Das: Modeling Radiotherapy using an iterated birth-death Markov Process with Sharpe software package. Conference Abstract, Canadian Association of Physicists (CAP) Congress 2006, June 2006.
  • O. Falou, R. Castelino, A. El Kaffas, O. Das: Modeling Radiotherapy using an Iterated Birth/Death Markov Process with SHARPE Software Package, Proc. International Conference for Upcoming Engineers (ICUE), University of Waterloo,  May 2006.

  • O. Das and C. M. Woodside: Dependable-LQNS: A Performability Modeling Tool for Layered Systems, Illinois International Multiconference on Measurement, Modelling, and Evaluation of Computer-Communication Systems, Urbana and Monticello, Illinois, USA, Sept. 2003, pp. 17-18.

  • O. Das and C. M. Woodside: Dependable LQNS: A Performability Modeling Tool for Layered Systems, IEEE International Conference on Dependable Systems and Networks (DSN 2003), San Francisco, California, USA, June 2003, pp. 672.

 

Ph. D. Thesis

  • O. Das: Dependability Modelling of Layered Systems, Ph.D. thesis, Department of Systems and Computer Engineering, Carleton University, 2004.

Master's Thesis

  • O. Das: Performance and Dependability Analysis of Fault-Tolerant Layered Distributed Systems, Master's thesis, Department of Systems and Computer Engineering, Carleton University, 1998.