Refereed Journal Articles

  • May 2019

    W. Lindquist, A. Helal, A. Khaled, "MAAT: Mobile Apps As Things in the IoT," submitted to the Proceedings of the ACM Journal on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT). Submitted May 2019.
  • August 2019

    Y. Xu, A. Helal, C. Lee, and A. Khaled, “Energy Savings in Very Large Cloud-IoT Systems,” the Open Journal of Internet of Things (OJIOT), ISSN 2364-7108. Presented as the Keynote of the Very Large Internet of Things (VL-IoT) Workshop, in conjunction with the VLDB conference held August 2019 in Los Angeles, California.
  • March 2019

    E. Kim, C. Lee and A. Helal, "SLA-Based Adaptation Schemes in Distributed Stream Processing Engines," Journal of Applied Sciences, March 2019, 9, 1045; doi:10.3390/ app9061045.
  • 2019

    A. Helal and C. Bull, "From Smart Homes to Smart-ready Homes and Communities," special issue on Technology and Dementia, in the Dementia and Geriatric Cognitive Disorders journal, Karger, DOI: 10.1159/000497803, 2019.
  • January 2019

    D. Kim, A. Muhammad, E. Kim, A. Helal and C. Lee, "TOSCA-Based and Federation-Aware Cloud Orchestration for Kubernetes Container Platform," MDPI Applied Science, 9, 191; doi:10.3390/app9010191, January 2019.
  • March 2019

    A. Khaled, Y. Lindquist, and A. Helal, "Atlas RIDE: Runtime-Interactive Development Environment for Mobile Users to Program Smart Spaces," submitted to the Internet of Things: Engineering Cyber Physical Human Systems Journal, Elsevier. Submitted March 2019.
  • 2019

    E. Lagerspatz, J. Hamberg, H. Flores, P. Nurmi, N. Davies, and A. Helal, "Pervasive Data Science on the Edge," IEEE Pervasive Computing. Accepted, to appear in 2019.
  • December 2018

    X. Liu, S. Cao, A. Helal and J. Zhou, C. Jia "A Multi-Location Defense Scheme against SSDP Reflection Attacks in the Internet of Things," In review in Sensors, MDPI. Submitted December 2018.
  • September 2018

    K. Alexander, C. Lee, E. Kim, and A. Helal, "Cost-Aware Orchestration of Applications over Heterogeneous Clouds," submitted to IEEE Access. Submitted Sept 2018.
  • October 2018

    X. Liu, S. Cao, A. Helal, J. Zhou, C. Jia and W. Zhang, "A Multi-Location Defense Scheme against SSDP Reflection Attacks in the Internet of Things," In review in the IEEE Internet of Things Journal. Revision submitted October 2018.
  • August 2018

    C. Chen, A. Helal and C. Lee, "IoTranx: Transactions for Safer Smart Spaces," Submitted to the IEEE Internet of Things Journal. Submitted August 2018.
  • August December 2018

    D. Lee, A. Helal and E. Jung, "Persuasion-enabled Telehealth System," Journal of Intelligent and Fuzzy Systems, IOS Press. vol. 35, no. 6, pp. 6133-6140, December August 2018.
  • August 2018

    A. Khaled, Y. Lindquist, and A. Helal, "Service-Relationship Programming Framework for the Social IoT," the Open Journal of Internet of Things (OJIOT), ISSN ISSN 2364-7108. Presented in the Very Large Internet of Things (VL-IoT) Workshop, in conjunction with the VLDB conference held August 2018 in Rio de Janeiro, Brazil.
  • December 2018

    A. Khaled, A. Helal, W. Lindquist and C. Lee "IoT-DDLDevice Description Language for the "T" in IoT," IEEE Access, Vol 6, Issue 1, PP(24048-24063), December 2018. DOI: 10.1109/ACCESS.2018.2825295
  • April 2018

    X. Zhang, C. Lee, and A. Helal, "iPOJO Flow: A Declarative Service Workflow Architecture for Ubiquitous Cloud Applications," Journal of Ambient Intelligence and Humanized Computing (AIHC), April 2018, DOI: 10.1007/s12652-018-0792-5.
  • September 2017

    J. Wang, Y. Wang, A. Helal and D. Zhang, "Energy Saving Techniques in Mobile Crowd Sensing: Current State and Future Opportunities," Accepted for publication in the IEEE Communications Magazine. Accepted September 2017.
  • 2017

    C. Lee, C. Wang, E. Kim, and A. Helal, "Blueprint Flow: A Declarative Service Composition Framework for Cloud Applications," IEEE Access 09/2017; PP(99):1-1. 0.1109/ACCESS.2017.2748622
  • August 2017

    A. Balasubramanian, A. Helal and Y. Xu, "Latency Optimization in Cloud-Sensor Systems," the Open Journal of Internet of Things (OJIOT), 3(1), Pages 18-30, 2017. ISSN 2364-7108. Presented in the Very Large Internet of Things (VL-IoT) Workshop, in conjunction with the VLDB conference to be held August 2017 in Munich, Germany.
  • August 2017

    K. Alexander, C. Lee, E. Kim, and S. Helal, "Enabling End-to-End Orchestration of Multi-Cloud Applications," IEEE Access, August 2017, DOI: 10.1109/ACCESS.2017.2738658.
  • 2017

    A. Khaled and A. Helal, "Interoperable Communication Framework for Bridging RESTful and Topic-based Communication in IoT," Elsevier Journal on Future Generation Computer Systems (2018),
  • December 2016

    J. Wang, Y. Wang, D. Zhang, H. Xiong, L. Wang, A. Helal, Y. He, and, F. Wang "Fine-Grained Multi-Task Allocation for Participatory Sensing with a Shared Budget," the IEEE Internet of Things Journal. Vol 3, No 6, pp1395-1405, December 2016.
  • 2016

    W. Lee, S. Cho, P. Chu, H. Vu, S. Helal, W. Song, Y. Jeong, and K. Cho, "Automatic agent generation for IoT-based smart house simulator," (June 2016), Neurocomputing, Elsevier Publishing, http: //
  • August 2016

    C. Lee, H. Lee, E. Kim, and A. Helal, "VM Capacity-Aware Scheduling within Budget Constraints in IaaS Clouds," Accepted for publication in PLOS One. 11(8), August 2016.
  • 2016

    M. Abdul Alim, N. Nguyen, M. Thai, and A. Helal, "Structural Vulnerability Assessment of Community-Based Routing in Opportunistic Networks," IEEE Transactions on Mobile Computing, Volume: 15, Issue: 12, Dec. 1 2016.
  • 2016

    Jiangtao Wang, Sumi Helal, Yasha Wang and Daqing Zhang, "A Context-Driven Worker Selection Framework for Crowd-Sensing," International Journal of Distributed Sensor Networks, vol. 2016, Article ID 6958710, 16 pages, 2016. doi:10.1155/2016/6958710.
  • 2015

    D. Lee, A. Helal, Y. Sung, and S. Anton, "Situation-Based Assess Tree for User Behavior Assessment in Persuasive Telehealth," IEEE Transactions on Human-Machine Systems, vol. 45, no. 5, 2015, pp. 624634.
  • 2015

    J. W. Lee, S. Cho, S. Liu, K. Cho, and S. Helal, "Persim 3D: Context-Driven Simulation and Modeling of Human Activities in Smart Spaces," IEEE Transactions on Automation Science and Engineering, vol. 12, no. 4, pp. 12431256. 2015
  • 2016

    Y. Xu and A. Helal, "Scalable Cloud-Sensor Architecture for the Internet of Things," IEEE Internet of Things Journal, Vol. 3, pp. 285-298. 2016
  • 2015

    E. Kim, A. Helal, C. Nugent, and M. Beattie, "Analyzing Activity Recognition Uncertainties in Smart Home Environments," ACM Transactions on Intelligent Systems and Technology, vol. 6, no. 4, 2015.
  • 2014

    M. Thai, R. Bose, R. Tiwari, and A. Helal, "On Detection and Tracking of Variant Phenomena Clouds," ACM Transactions on Sensor Networks, vol. 10, no. 2, 2014.
  • September 2014

    E. Kim and A. Helal, "Training-Free Fuzzy Logic Based Human Activity Recognition," Journal of Information Processing Systems, vol. 10, no. 3, Sept 2014, ISSN 2092-805X, pp. 335354;
  • November 2012

    C. Lee, A. Helal, E. Kim, and W. Lee, "Exploiting Whole-Network Mobility for Mobile Service Discovery," InformationAn International Interdisciplinary Journal, vol. 15, no. 11(B), Nov 2012, pp. 51975216.
  • August 2012

    A. Helal, C. Chen, R. Bose, E. Kim, and C. Lee, "Towards an Ecosystem for Developing and Programming Assistive Environments," Proceedings of the IEEE, vol. 100, no. 8, Aug 2012, pp. 24892504.
  • 2012

    E. Kim and A. Helal, "Knowledge-Assisted Activity Modeling and Recognition," International Journal of E-Health and Medical Communications, vol. 3, no. 3, Nov. 2012, pp. 5471; DOI 10.4018/jehmc.2012070105.
  • 2012

    D. Nguyen, N. Nguyen, M. Thai, and A. Helal, "Optimal and Distributed Coverage Hole Healing in Hybrid Sensor Networks," International Journal of Sensor Networks, vol. 11, no. 4, 2012, pp. 228240.
  • 2012

    E. Cho and A. Helal, "Expressive Exceptions for Safe Pervasive Spaces," Journal of Information Processing Systems, vol. 8, no. 2, 2012, pp. 279300.
  • 2012

    S. Cadavid, M. Abdel-Mottaleb, and A. Helal, "Exploiting Visual Quasi-Periodicity for Real-time Chewing Event Detection Using Active Appearance Models and Support Vector Machines," Personal and Ubiquitous Computing Journal, Springer, vol. 16, no. 6, 2012, pp. 729739.
  • June 2012

    C. Chen and A. Helal, "System-Wide Support for Safety in Pervasive Spaces," Journal of Ambient Intelligence and Humanized Computing, Springer Berlin / Heidelberg, vol. 3, no. 2, June 2012, pp. 113123.
  • 2012

    D. Lee, A. Helal, S. Anton, S. De Deugd, and A. Smith, "Participatory and Persuasive Tele-Health," The International Journal of Experimental, Clinical, Behavioral, Regenerative and Technological Gerontology, vol. 58, no. 3, 2012, pp. 269-281; DOI 10.1159/000329892.
  • 2011

    D. Jo, A. Helal, E. Kim, W. Lee, and C. Lee, "Adaptive Push-Pull Protocols for P2P Based Video Streaming," Transactions of the Institute of Electronics, Information and Communication Engineers, vol. 94-B, no. 10, 2011, pp. 27592762.
  • September 2011

    A. Helal, R. Bose, C. Chen, A. Smith, S. de Deugd, and D. Cook, "STEPSTONE: A SODA Case Study in Personal Tele-Health Management," Journal of Computing Science and Engineering, vol. 5, no. 3, Sept 2011, pp. 269281.
  • November 2010

    H. Yang, C. Chen, A. Bessam, and A. Helal, "A Framework for Evaluating Pervasive Systems," International Journal of Pervasive Computing and Communications, vol. 6, no. 4, Nov 2010.
  • September 2009

    S. Lim, L. Chung, A. Helal, and H. Yang, "Framework Design of Pervasive Computing System for Inter Space Interactions between Private and Public Smart Spaces," International Journal of Fuzzy Logic and Intelligent Systems, vol. 9, no. 3, Sept 2009, pp. 198205.
  • July 2009

    A. Abukmail and A. Helal, "Energy Outsourcing for Mobile Devices in Pervasive Spaces," International Journal of Computational Intelligence: Theory and Practice, vol. 4, no. 1, July 2009.
  • 2009

    A. Helal, D. Cook, and M. Schmalz, "Smart Home-Based Health Platform for Behavioral Monitoring and Alteration of Diabetes Patients," Journal of Diabetes Science and Technology, vol. 3, no. 1, 2009, pp. 141148.
  • 2008

    A. Helal, R. Bose, S. Lim, and H. Kim, "Networked Robots Using Atlas Service-Oriented Architecture in Smart Spaces," International Journal of Fuzzy Logic and Intelligent Systems, vol. 8, no. 4, 2008, pp. 288298.
  • 2008

    J. Zhang and A. Helal, "Mobile Network Adaptation in the UbiData Mobile File System," International Journal of Computers and Applications, vol. 30, no. 2, 2008.
  • 2008

    C. Lee, S. Helal, and D. Nordstedt, "Impromptu Service Discovery and Delivery in Mobile Environments," Journal of Information Science and Engineering, vol. 24, no. 6, 2008.
  • 2009

    M. Al-Turkistany and A. Helal, "Adaptive Wireless Thin-Client Model for Mobile Computing," International Journal on Wireless Communications and Mobile Computing, vol. 9, no. 1, 2009, pp. 4759.
  • 2008

    J. Tian and A. Helal, "Speed Adaptive MIP over Wireless LAN," Journal of Wireless Communications and Mobile Computing, vol. 8, no. 10, 2008, pp. 13551364.
  • 2007

    R. Davenport, H. Elzabadani, J. Johnson, A. Helal, and W. Mann, "Pilot Live-in Trial at the GatorTech Smart House," Topics in Geriatric Rehabilitation, vol. 23, no. 1, 2007, pp. 7384.
  • September 2006

    A. Helal and B. Abdulrazak, "TeCaRob: Tele-Care Using Telepresence and Robotic Technology for Assisting People with Special Needs," International Journal of Human-Friendly Welfare Robotic Systems, vol. 7, no. 3, Sept 2006.
  • 2006

    J. Meng, S. Su, A. Helal, and H. Lam, "DynaFlow: A Dynamic Inter-Organizational Workflow," International Journal of Business Process Integration and Management, vol. 1, no. 2, 2006, pp. 101115.
  • March 2005

    A. Helal, W. Mann, H. Zabadani, J. King, Y. Kaddoura, and E. Jansen, "The Gator Tech Smart House: A Programmable Pervasive Space," cover feature, Computer, vol. 38, no. 3, Mar 2005, pp. 6474.
  • 2005

    A. Helal, J. Lu, and E. Jansen, "A Web Services Based Personal Information Integration Framework," International Journal of Web Services Research, vol. 2, no. 3, 2005.
  • 2005

    W. Mann, A. Helal, P. Belchoir, M. Tomita, and B. Kemp, "Computer Use by Middle-Aged and Older Adults with Disabilities," Technology & Disability, vol. 17, no. 1, 2005, pp. 19.
  • December 2004

    A. Helal and J. Hammer, "UbiData: Requirements and Architecture for Ubiquitous Data Access," SIGMOD RECORD, vol. 33, no. 4, Dec 2004.
  • 2004

    W. Mann, A. Helal, R. Davenport, M. Justiss, M. Tomita, and B. Kemp, "Use of Cell Phones by Elders with Impairments: Overall Appraisal, Satisfaction and Suggestions," Journal on Technology and Disability, vol. 16, 2004, pp. 4957.
  • December 2003

    W. Mann and A. Helal, "Smart TechnologyA Bright Future for Independent Living," The Society for Certified Senior Advisors Journal, vol. 21, Dec 2003.
  • 2002

    M. Lee and A. Helal, "HiCoMo: High Commit Mobile Transactions," International Journal of Parallel and Distributed Database Systems, vol. 11, no. 1, 2002, pp. 73–92.
  • 2002

    A. Helal, S. Shah, and E. Hernandez, "Mobility Benchmarking In Ad-Hoc Networks," IPSJ Journal, vol. 43, no. 11, 2002.
  • 2002

    A. Helal and M. Wang, "Service-Centric Brokering in Dynamic E-Business Agent Communities," Journal of Electronic Commerce Research, special issue on Intelligent Agents in e-Commerce, vol. 2, no. 1, Feb 2001; ISSN 15266133.
  • September 2000

    C. Lee and A. Helal, "Protocols for Service Discovery in Dynamic and Mobile Networks," International Journal of Computer Research, special issue on Wireless Systems and Mobile Computing, Sept 2000.
  • November 1999

    Y. Taha, A. Helal, K. Ahmed, and J. Hammer, "Managing Multi-Task Systems Using Workflows," ISMM Mini and Microcomputer Journal, vol. 21, no. 3, Nov 1999, pp. 69-78.
  • June 1999

    J. Jing, A. Helal, and A. Elmagarmid, "Client-Server Computing in Mobile Environments," ACM Computing Surveys, vol. 31, no. 2, June 1999, pp. 117157.
  • June 1998

    X. Liu, A. Helal, and W. Du, "Multi-view Access Protocols for Large-Scale Replication," ACM Transactions on Database Systems, vol. 23, no. 2, June 1998, pp. 158198.
  • May 1998

    H. Jiang, A. Helal, A. Elmagarmid, and A. Joshi, "Scene Change Detection for Video Database Management Systems," ACM Multimedia Systems Journal, vol. 6, no. 3, May 1998, pp. 186195.
  • March 1998

    E. Mohamed, H. El-Rewini, A. Wahab, and A. Helal, "Parallel Database Architectures: A Comparison Study," Informatica, special issue on Parallel and Distributed Database Systems, vol. 22, no. 2, Mar 1998, pp. 195205.
  • October 1997

    M. Dunham, A. Helal, and S. Balakrishnan, "A Mobile Transaction Model That Captures Both the Data and Movement Behavior," ACM-Baltzer Journal on Mobile Networks and Applications (MONET), vol. 2, no. 2, Oct 1997, pp. 149162.
  • October 1997

    J. Jing, A. Elmagarmid, A. Helal, and R. Alonso, "Bit-Sequences: An Adaptive Cache Invalidation Method in Mobile Client/Server Environments," ACM-Baltzer Journal on Special Topics in Mobile Networks and Applications (MONET), vol. 2, no. 2, Oct 1997, pp. 115127.
  • July 1997

    A. Helal, D. Yuan, and H. El-Rewini, "Dynamic Data Reallocation for Skew Management in Shared-Nothing Parallel Databases," Distributed and Parallel Databases, An International Journal, vol. 5, no. 3, July 1997, pp. 271288.
  • March 1997

    Y. Taha, A. Helal, and K. Ahmed, "Data Warehousing: Usage, Architecture, and Research Issues," ISMM Microcomputer Applications Journal, vol. 16, no. 2, Mar 1997, pp. 7080.
  • February 1996

    A. Helal and J. Fortner, "Achieving Scalability in Highly Contentious Database Systems," Journal of Information Sciences, vol. 89, no. 1-2, Feb 1996, pp. 3961.
  • March 1995

    A. Helal, "Modeling Database System Availability under Network Partitioning," Journal of Information Sciences, vol. 83, no. 1-2, Mar 1995, pp. 2335.
  • December 1991

    B. Bhargava, A. Helal, and K. Friesen, "Analyzing Availability of Fault-Tolerant Distributed Database Systems," International Journal of Computer Simulation, vol. 1, no. 4, Dec 1991, pp. 393418.
  • March 1989

    A. Helal and A. Elmagarmid, "Towards a Unified Model for Performance Evaluation of Concurrency Control," Journal of Information Sciences, vol. 47, no. 3, March 1989, pp.7794.