A. Helmy's picture NOMADS group logo

Ahmed Helmy
Associate Professor
Computer & Information Science & Engineering (CISE) Department
College of Engineering, University of Florida
Founder and Director: Mobile Networking Laboratory (NOMADS group)
(Courtesy appointements: ECE Dept, UF and EE - Systems Dept, USC)
email: helmy at ufl.edu

Select a year: 2009 - 2008 - 2007 - 2006 - 2005 - 2004 - 2003 - 2002 - prior to 2002
Go back to Selected Publications

2009

  1. W. Hsu, T. Spyropoulos, K. Psounis, A. Helmy, TVC: "Modeling Spatial and Temporal Dependencies of User Mobility in Wireless Mobile Networks", IEEE/ACM Transactions on Networking, pp. 1564-1577, Vol. 17, No. 5, October 2009.
  2. W. Hsu, D. Dutta, A. Helmy, "CSI: A Paradigm for Behavior-oriented Profile-cast Services in Mobile Networks", IEEE/ACM Transactions on Networking, accepted with revision.
  3. S. Tanachaiwiwat, A. Helmy, "Encounter-based Worms: Analysis and Defense", Ad Hoc Networks Journal - Elsevier. Volume 7, Issue 7, Pages 1414-1430, September 2009.
  4. Y. Kim, A. Helmy, "CATCH: A Protocol Framework for Cross-layer Attacker Traceback in Mobile Multi-Hop Networks", Ad Hoc Networks Journal - Elsevier, pp. 193-213, Vol. 8, Issue 2, March 2010.
  5. K. Seada, A. Helmy, R2D2: "Geographic Rendezvous-based Architectures for Emergency Data Dissemination", Journal on Wireless Communications and Mobile Computing, Wiley. Accepted, in press (Dec 08) (Early version).
  6. S. Wang, A. Helmy, "Background Traffic-Aware Rate Adaptation for IEEE 802.11: Implementation and Test-bed Experimental Results", ACM Mobile Computer and Communications Review (MC2R), To appear 2009. [Top 4, finalist in ACM MobiCom SRC]
  7. J. Kim, A. Helmy, "The Challenges of Accurate Mobility Prediction for Ultra Mobile Users", ACM Mobile Computer and Communications Review (MC2R), To appear 2009.
  8. Y. Kim, A. Helmy, "Attacker Trace-back in Wireless and Mobile Networks", Book Chapter (Chapter 5), Handbook on Security and Networks, Eds. Y. Xiao, F. Li, H. Chen. To be published by World Scientific Publishing Co., 2009.
  9. S. Tanachaiwiwat, A. Helmy, "Worm Propagation and Interaction in Mobile Networks", Book Chapter (Chapter 6), Handbook on Security and Networks, Eds. Y. Xiao, F. Li, H. Chen. To be published by World Scientific Publishing Co., 2009.
  10. W. Hsu, A. Helmy, "Trace-based Analysis of Mobile User Behaviors for Opportunistic Networks", Book Chapter in the book "Mobile Opportunistic Networks: Architectures, protocols and applications". To be published by Auerbach Publications, Taylor & Francis Group, 2009.
  11. S. Tanachaiwiwat, A. Helmy, "Analysis of Worm Interactions: In Wired and Wireless Networks", Book published by VDM Verlag, ISBN 978-3-639-15653-9, May 2009.
  12. W. Hsu, F. Bai, A. Helmy, "Mobility Modeling for Vehicular Networks", Book chapter in a book by Chapman & Hall/CRC, (Ed. A. Boukerche). Invited Jul 09. In preparation.
    13. Conference Papers
  13. U. Kumar, A. Helmy, "Human behavior and Challenges of anonymizing WLAN traces", IEEE Globecom, Nov. 2009. [Acceptance: 34%]
  14. S. Begum, A. Helmy, S. Gupta, "Modeling and Test Generation for Worst-Case Performance Evaluation of MAC Protocols for Wireless Ad Hoc Networks", IEEE Int'l Symposium on Modelling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS), full presentation, Sept. 2009. [Full presentation acceptance: 20%].

2008

  1. M. Zuniga, K. Seada, B. Krishnamachari, A. Helmy, "Efficient Geographic Routing over Lossy Links in Wireless Sensor Networks", ACM Transactions on Sensor Networks (TOSN), pp. 12:1-33, Article 12 (33 pages), Vol. 4, No. 3, May 2008.
  2. K. Nahm, A. Helmy, C.-C. Kuo, "Cross-layer Interaction of TCP and Ad Hoc Routing Protocols in Multihop 802.11 Networks", IEEE Transactions on Mobile Computing (TMC), pp. 458 - 469, Vol. 7, Issue 4, April 2008.
  3. U. Kumar, N. Yadav, A. Helmy, "Gender-based Feature Analysis in Campus-wide WLANs", ACM Mobile Computer and Communications Review (MC2R), Vol. 12, Issue 1, pp. 40-42, January 2008. [Top 10% & Winner of 3rd place prize in ACM MobiCom SRC].
  4. W. Hsu, D. Dutta, A. Helmy, "Profile-Cast: Behavior-Aware Mobile Networking", ACM Mobile Computer and Communications Review (MC2R), Vol. 12, Issue 1, pp. 52-54, January 2008. [Top 5 in ACM MobiCom SRC].
    5. Conference Papers
  5. S. Wang, A. Helmy, "BEWARE: Background Traffic-Aware Rate Adaptation for IEEE 802.11", Extended (plenary session) paper at The 9th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM), June 2008 [Acceptance to the plenary session: 7% of 181 submissions]
  6. J. Faruque, A. Helmy, "PBS: A Virtual Grid Architecture for Gradient-Based Active Querying in Sensor Networks", ACM/IEEE Int'l Symposium on Collaborative Technologies and Systems (CTS) [Workshop on Distributed Collaborative Sensor Networks (DCSN)], pp. 9-18, May 2008.
  7. U. Kumar, A. Helmy, "Gender-based Grouping of Mobile Student Societies", IEEE/ACM IPSN Int'l Workshop on Mobile Device and Urban Sensing (MODUS), April 2008.
  8. W. Hsu, D. Dutta, A. Helmy, "Profile-Cast: Behavior-Aware Mobile Networking", IEEE Wireless Communications and Networking Conference (WCNC), pp. 3033-3038, March 2008.
    9. Refereed Posters
  9. S. Wang, A. Helmy, "BeWare: Wireless MAC rate adaptation Analysis and Testing", ACM MobiCom, Sept 2008.
  10. J. Kim, A. Helmy, "The Challenges of Accurate Mobility Prediction for Ultra Mobile Users", ACM MobiCom, Sept 2008.
  11. U. Kumar, A. Helmy, "How Private are WLAN traces?", IEEE ICNP, Oct 2008.
  12. G. Bhaskara, S. Gupta, A. Helmy, "Topology Generation for Protocol Design and Testing", IEEE ICNP, October 2008.
  13. J. Kim, A. Helmy, "Mobility Characteristics and Prediction for Ultra Mobile Users", IEEE ICNP, October 2008.
  14. S. Moon, U. Kumar, J. Kim, W. Hsu, A. Helmy, "Visualization and Representation of Mobile Network Users", IEEE SECON (Demo) June 2008, IEEE INFOCOM (Demo) April 2008, IEEE ICNP (Poster) October 2008.

2007

  1. K. Seada, A. Helmy, R. Govindan, "Modeling and Analyzing the Correctness of Geographic Face Routing under Realistic Conditions", Ad Hoc Networks Journal - Elsevier, Special issue on Recent Advances in Wireless Sensor Networks, pp. 855-871, Vol. 5, Issue 6, August 2007.
  2. W. Hsu, D. Dutta, A. Helmy, "On the Structure of User Association Patterns in Wireless LANs", ACM Mobile Computer and Communications Review (MC2R), Vol.11, No.2, pp. 67-68, Apr 2007
    3. Conference Papers
  3. W. Hsu, T. Spyropoulos, K. Psounis, A. Helmy, TVC: "Modeling Time-variant User Mobility in Wireless Mobile Networks", IEEE INFOCOM, pp.758-766,May 2007 [Acceptance rate: ~17%]
  4. F. Bai, A. Helmy, MAID: "Impact of Mobility on Mobility-Assisted Last Encounter Based Routing Protocols", IEEE SECON (4th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks), pp. 461-470, June 2007. [Acceptance: 20%].
  5. W. Hsu, D. Dutta, A. Helmy, "Mining Behavioral Groups in Large Wireless LANs", ACM MobiCom, pp. 338-341 (short paper), Sept. 2007. [In the top 11% of 233 submissions.]
  6. S. Tanachaiwiwat, A. Helmy, "On the Performance Evaluation and Prediction of Encounter-based Worm Interactions Based on Node Characteristics", ACM MobiCom Workshop on Challenged Networks (CHANTS), pp. 67-74, September 2007.
  7. S. Begum, S. Gupta, A. Helmy, "Performance Analysis of Wireless MAC Protocols using a Search-based Framework", 15th IEEE Int'l Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS), Oct. 2007.
  8. S. Tanachaiwiwat, A. Helmy, "Modeling and Analysis of Worm Interactions (War of the Worms)", IEEE Broadnets, September 2007.
  9. S. Tanachaiwiwat, A. Helmy, "Computer Worm Ecology in Encounter-based Networks", IEEE Broadnets (4t Int'l Conf on Broadband Communications, Networks & Systems), September 2007.
    10. Refereed Posters
  10. U. Kumar, N. Yadav, A. Helmy, "Gender-based Feature Analysis in Campus-wide WLANs", ACM MobiCom, Sept 2007.
  11. W. Hsu, D. Dutta, A. Helmy, "Profile-Cast: Behavior-Aware Mobile Networking", ACM MobiCom, Sept 2007.
  12. S. Tanachaiwiwat, A. Helmy, "Demo: Proof-of-Concept Worm Interactions via Mobile Devices", ACM MobiCcom CHANTS Workshop, Sept 2007.
  13. J. Kim, Y. Du, M. Chen, A. Helmy, "Comparing Mobility and Predictability of VoIP and WLAN Traces", ACM MobiCom CRAWDAD Workshop, Sept 2007.
  14. U. Kumar, N. Yadav, A. Helmy, "Analyzing Gender-gaps in Mobile Student Societies: Method and Data Manipulation", ACM MobiCom CRAWDAD Workshop, Sept 2007.

2006

  1. K. Seada, A. Helmy, "Efficient and Robust Geocasting Protocols for Sensor Networks", Computer Communications Journal-Elsevier, Special Issue on Dependable Wireless Sensor Networks, Vol. 29, Issue 2, pp. 151-161, January 2006.
  2. F. Bai, A. Helmy, "The IMPORTANT Framework for Analyzing and Modeling the Impact of Mobility in Wireless Adhoc Networks", Book Chapter in the book "Wireless Ad Hoc and Sensor Networks", Springer, October 2006, ISBN: 978-0-387-25483-8.
  3. F. Bai, A. Helmy, "A Survey of Mobility Modeling and Analysis in Wireless Adhoc Networks", Book Chapter in the book "Wireless Ad Hoc and Sensor Networks", Springer, October 2006, ISBN: 978-0-387-25483-8.
  4. K. Seada, A. Helmy, "Geographic Services for Wireless Networks", Book Chapter in the "Handbook of Algorithms for Wireless Networking and Mobile Computing" published by Chapman & Hall/CRC, pp. 343-364, January 2006, ISBN: 1-58488-465-7.
  5. K. Seada, A. Helmy, "Geographic Routing in Sensor Networks", Chapter in the Encyclopedia of Sensors, American Scientific Publishers, Volume 4, pp. 193-204, 2006, ISBN: 1-58883-056-X (Set), ISBN: 1-58883-060-8 (Volume 4).
  6. S. Ghandeharizadeh, A. Helmy, B. Krishnamachari, F. Bar, T. Richmond, "Data Management Techniques for Continuous Media In Ad-Hoc Networks of Wireless Devices", "Data Discovery, Routing and Traffic Patterns" , "Placement of Continuous Media in Ad-Hoc Networks of Devices", "Mobility Modeling and Design for Mobility", four book chapters in Encyclopedia of Multimedia, Furht, Borko (Ed.), Springer 2006, XXIII, Hardcover, ISBN: 978-0-387-24395-5.
    7. Conference Papers
  7. S. Tanachaiwiwat, A. Helmy, "Analyzing the Interactions of Self-Propagating Codes in Multi-hop Networks", IEEE SSS (8th Int'l Symposium on Stabilization, Safety, and Security of Distributed Systems), (Short paper), November 2006.
  8. S. Wang, A. Helmy, "Performance Limits and Analysis of Contention-based IEEE 802.11 MAC", IEEE LCN (31st Annual IEEE Conference on Local Computer Networks), pp.418-425, Nov. 2006
  9. Y. Kim, A. Helmy, "Attacker traceback with cross-layer monitoring in wireless multi-hop networks", Proceedings of the ACM SASN (fourth ACM workshop on Security of ad hoc and sensor networks), pp. 123-134, October 2006.
  10. S. Tanachaiwiwat, A. Helmy, "Encounter-based Worms: Analysis and Defense", 2nd IEEE Workshop on Wireless Mesh Networks (WiMesh), pp. 170-172, September 2006.
  11. W. Hsu, A. Helmy, "On Nodal Encounter Patterns in Wireless LAN Traces", The 2nd IEEE Int'l Workshop on Wireless Network Measurement (WiNMee), April 2006 [Nominated for best paper award at USC EE Dept, 2006].
  12. W. Hsu, A. Helmy, "On Modeling User Associations in Wireless LAN Traces on University Campuses", 2nd IEEE Int'l Workshop on Wireless Network Measurement (WiNMee), April 2006.
    13. Refereed Posters
  13. W. Hsu, D. Dutta, A. Helmy, "Structure of User Associations in Wireless LANs", ACM MobiCom, Sept 2006.
  14. S. Tanachaiwiwat, A. Helmy, "Encounter-based Worms: Analysis and Defense", IEEE SECON, Sept 2006.
  15. W. Hsu, A. Helmy, "Principal Component Analysis of User Association Patterns in Wireless LAN Traces", IEEE INFOCOM, April 2006.
  16. W. Hsu, A. Helmy, "Capturing User Friendship in WLAN Traces", IEEE INFOCOM, Apr 2006.
  17. Y. Kim, A. Helmy, "Attacker Traceback and Countermeasure with Cross-layer Monitoring in Wireless Multi-hop Networks", IEEE INFOCOM, April 2006.
  18. S. Tanachaiwiwat, A. Helmy, "VACCINE: War of the Worms in Wired and Wireless Networks", IEEE INFOCOM, April 2006.
  19. S. Begum, A. Helmy, S. Gupta, "A Framework for Modeling, Test Generation and Performance Evaluation of Wireless AdHoc and Sensor MAC Protocols", IEEE INFOCOM, April 2006.

2005

  1. A. Helmy, S. Gupta, "FOTG: Fault Oriented Stress Testing of Multicast Routing", IEEE Communications Letters, Vol. 9, No. 4, pp. 375-377, April 2005.
  2. A. Helmy, S. Garg, P. Pamu, N. Nahata, "CARD: A Contact-based Architecture for Resource Discovery in Ad Hoc Networks", ACM Mobile Networks and Applications (MONET) Journal, Vol. 10, Issue 1, pp. 99-113, February 2005. [Acceptance rate: 22% of 60 submissions]
  3. N. Sadagopan, B. Krishnamachari, A. Helmy, "Active Query Forwarding in Sensor Networks (ACQUIRE)", Ad Hoc Networks Journal - Elsevier, Vol. 3, Issue 1, pp. 91-113, January 2005. [Acceptance rate: 12%]
  4. A. Helmy, TRANSFER: "Contact-extended Zone-based Routing for Transactions in Ad Hoc Networks", IEEE Transactions on Vehicular Technology, Vol. 54, No. 1, pp. 307-319, January 2005.
  5. W. Hsu, K. Merchant, H. Shu, C. Hsu, A. Helmy, WWP: "Weighted Way Mobility Model and its Impact on Ad Hoc Networks", ACM Mobile Computer and Communications Review (MC2R), Vol. 9, No. 1, pp. 59-63, January 2005.
  6. A. Helmy, "Efficient Resource Discovery in Wireless AdHoc Networks: Contacts Do Help", Book chapter in "Resource Management in Wireless Networking", Springer, ISBN: 0-387-23807-7, Vol. 16, 2005.
    7. Conference Papers
  7. K. Nahm, A. Helmy, C.-C. Kuo, "TCP over Multihop 802.11 Networks: Issues and Performance Enhancement", ACM MobiHoc (6thACM International Symposium on Mobile Ad Hoc Networking and Computing), pp. 277-287, May 2005. [Acceptance rate: 14% of 281 submissions]
  8. S. Ebrahimi, A. Helmy, S. Gupta, "TCP vs. TCP: a Systematic Study of Adverse Impact of Short-lived TCP Flows on Long-lived TCP Flows", IEEE INFOCOM, pp. 926-937, March 2005. [Acceptance rate: 17% of 1419 submissions] [Nominated for best paper award at USC EE, 2005].
  9. A. Das, D. Dutta, A. Helmy, A. Goel, J. Heidemann, "Low State Fairness: Lower Bounds and Practical Enforcement", IEEE INFOCOM, pp. 2436-2446, March 2005 [Acceptance rate: 17%].
  10. C. Li, W. Hsu, B. Krishnamachari, A. Helmy, "A Local Metric for Geographic Routing with Power Control in Wireless Networks", IEEE Conference on Sensor and Ad Hoc Communications and Networks (SECON), September 2005 [Acceptance rate: 27% of 202 submissions]
  11. Y. Kim, A. Helmy, "SWAT: Small World-based Attacker Traceback in Ad-hoc Networks", IEEE/ACM Mobiquitous Conference, pp. 85-96, Jul 2005. [Acceptance rate: 35% of 127]
  12. S. Tanachaiwiwat, A. Helmy, "Correlation analysis for alleviating effects of inserted data in wireless sensor networks", IEEE/ACM Mobiquitous Conference, pp.97-108, Jul 2005 [Rate: 35%]
  13. J. Faruque, K. Psounis, A. Helmy, "Analysis of Gradient-based Routing Protocols in Sensor Networks", IEEE/ACM Int'l Conference on Distributed Computing in Sensor Systems (DCOSS), pp. 258 - 275, June 2005. [Acceptance rate: 28% of 85 submissions]
  14. S. Wang, Y. Chen, T. Lee, A. Helmy, "Performance Evaluations for Hybrid IEEE 802.11b and 802.11g Wireless Networks", 24th IEEE International Performance Computing and Communications Conference (IPCCC), April 2005. [Acceptance rate: 32% of 115 submissions].
    15. Refereed Posters
  15. W. Hsu, A. Helmy, "Encounter-based message broadcasting in ad hoc networks with intermittent connectivity", ACM MOBIHOC, May 2005.
  16. K. Nahm, A. Helmy, C. Kuo, "Improving Stability and Performance of Multihop 802.11 Networks", ACM MOBIHOC, May 2005.
  17. F. Bai, A. Helmy, "The Impact of Mobility on the Mobility-Assisted Information Diffusion Protocol", IEEE INFOCOM, March 2005.
  18. Y. Kim, A. Helmy, "SWAT: Small World-based Attacker Traceback in Ad-hoc Networks", IEEE INFOCOM, March 2005.
  19. K. Nahm, A. Helmy, C. Kuo, "The impact of probe traffic scale on the stability of multihop 802.11 networks", IEEE INFOCOM, March 2005.

2004

  1. K. Seada, A. Helmy, S. Gupta, "A Framework for Systematic Evaluation of Multicast Congestion Control Protocols", IEEE Journal on Selected Areas in Communications (JSAC), Volume 22, Issue 10, pp. 2048- 2061, December 2004. [Nominated for best paper award at USC EE, 2005].
  2. F. Bai, N. Sadagopan, B. Krishnamachari, A. Helmy, PATHS: "Modeling Path Duration Distributions in MANETs and their Impact on Routing Performance", IEEE Journal on Selected Areas in Communications (JSAC), Vol. 22, No. 7, pp. 1357-1373, September 2004. [Acceptance rate: 18% of 82] [Nominated for best paper award at USC EE Dept, 2005].
  3. A. Das, D. Dutta, A. Helmy, "A Low-state Packet Marking Framework for Approximate Fair Bandwidth Allocation", IEEE Communications Letters, Vol. 8, No. 9, pp. 588-590, Sept 2004.
  4. D. Son, A. Helmy, B. Krishnamachari, "The Effect of Mobility-induced Location Errors on Geographic Routing in Mobile Ad Hoc and Sensor Networks: Analysis and Improvement using Mobility Prediction", IEEE Transactions on Mobile Computing (TMC), Special issue on Mission-Oriented Sensor Networks, Vol. 3, No. 3, pp. 233-245, July 2004 [Acceptance rate: 25%]
  5. F. Bai, G. Bhaskara, A. Helmy, "Building the Blocks of Protocol Design and Analysis: Challenges and Lessons Learned from Case Studies on Mobile Ad hoc Routing and Micro-Mobility Protocols", ACM Computer Communications Review (CCR), Special issue on Science of Networking Design, Volume 34, Number 3, pp.57-69, July 2004. [Acceptance rate: 15% of 40].
  6. A. Helmy, M. Jaseemuddin, Ganesha Bhaskara, M&M: "Multicast-based Mobility: A Novel Architecture for Efficient Micro-Mobility", IEEE Journal on Selected Areas in Communications (JSAC), Vol. 22, No. 4, pp. 677-690, May 2004. [Acceptance rate: 25% of 60 submissions]
  7. A. Helmy, S. Gupta, D. Estrin, "The STRESS Method for Boundary-point Performance Analysis of End-to-end Multicast Timer-Suppression Mechanisms", IEEE/ACM Transactions on Networking, Volume 12, Issue 1, pp. 44-58, February 2004. [Acceptance rate '03: 18% of 439]
  8. A. Helmy, "CAPTURE: location-free Contact-Assisted Power-efficienT qUery REsolution for Sensor Networks", ACM Mobile Computer and Communications Rev. (MC2R), Sp. issue on Wireless PAN/Sensor Networks, vol. 8, No. 1, pp. 27-47, Jan '04. [Acceptance rate: 22% of 35]
  9. Y. Kim, J. Lee, A. Helmy, "Impact of Location Inconsistencies on Geographic Routing in Wireless Networks", ACM Mobile Computer and Communications Rev (MC2R), Sp. issue on Wireless PAN/Sensor Networks, vol. 8, No. 1, pp. 48-60, Jan '04. [Acceptance rate: 22% of 35]
    10. Conference Papers
  10. K. Seada, M. Zuniga, A. Helmy, B. Krishnamachari, "Energy-Efficient Forwarding Strategies for Geographic Routing in Lossy Wireless Sensor Networks", 2nd ACM Conference on Embedded Networked Sensor Systems (SenSys), pp. 108-121, November 2004. [Acceptance: 14% of 145] [Nominated for best paper award at USC EE Dept, 2005].
  11. K. Seada, A. Helmy, R. Govindan, "On the Effect of Localization Errors on Geographic Face Routing in Sensor Networks", 3rd IEEE/ACM International Symposium on Information Processing in Sensor Networks (IPSN), pp. 71-80, April 2004. [Acceptance rate: 33% of 150] [Nominated for best paper award at USC EE Dept, 2004].
  12. J. Faruque, A. Helmy, "RUGGED: RoUting on finGerprint Gradients in sEnsor Networks", IEEE Int'l Conf on Pervasive Services (ICPS), pp.167-177, July 2004. [Acceptance rate: 36%]. [ppt]
  13. F. Bai, N. Sadagopan, A. Helmy, "BRICS: A Building-block approach for analyzing RoutIng protoCols in Ad Hoc Networks - A Case Study of Reactive Routing Protocols", IEEE Int'l Conf on Communications (ICC), Vol. 6, pp. 3618-3622, June 2004. [Acceptance rate: 29%].
  14. K. Seada, A. Helmy, R2D2: "Rendezvous Regions: A Scalable Architecture for Service Location and Data-Centric Storage in Large-Scale Wireless Networks", IEEE/ACM IPDPS Int'l Workshop on Algorithms for Wireless, Mobile, Ad Hoc and Sensor Networks (WMAN), pp.218-225, Apr '04.
  15. G. Bhaskara, A. Helmy, "TCP over Micro-mobility Protocols: Systematic Ripple Effect Analysis", IEEE Vehicular Technology Conference (VTC), Vol. 5, pp. 3095 - 3099, Sept 2004.
  16. K. Seada, A. Helmy, "Efficient Geocasting with Perfect Delivery in Wireless Networks", IEEE WCNC, pp. 2551 - 2556, March 2004.
  17. D. Son, A. Helmy, B. Krishnamachari, "The Effect of Mobility-induced Location Errors on Geographic Routing in Ad Hoc Networks: Analysis and Improvement using Mobility Prediction", IEEE WCNC, pp. 189-194 March 2004.
  18. S. Begum, S. Wang, B. Krishnamachari, A. Helmy, "ELECTION: Energy-efficient and Low-latEncy sCheduling scheme for wIreless sensOr NeTworks", IEEE LCN, November 2004.
  19. Y. Lu, H. Lin, Y. Gu, A. Helmy, "Towards Mobility-Rich Performance Analysis of Routing Protocols in Ad Hoc Networks: Using Contraction, Expansion and Hybrid Models", IEEE ICC, Vol. 7, pp. 4346-4352, June 2004. [Acceptance rate: 29%].
  20. C. Shete, S. Sawhney, S. Herwadka, V. Mehandru, A. Helmy, ""Analysis of the Effects of Mobility on the Grid Location Service in Ad Hoc Networks", IEEE ICC, Vol. 7, pp. 4341-4345, Paris, France, June 2004. [Acceptance rate: 29%].
  21. Y. Kim, V. Sankhla, A. Helmy, "Efficient Traceback of DoS Attacks using Small Worlds in MANET", IEEE VTC, Vol. 6, pp. 3979-3983, Sept 2004.
  22. W. Hsu, K. Merchant, H. Shu, C. Hsu, A. Helmy, "Preference-based Mobility Model and the Case for Congestion Relief in WLANs using Adhoc Networks", IEEE VTC, pp. 2962-2966, Sep. 04. [ppt]
  23. S. Sharma, V. Alatzeth, G. Grewal, S. Pradhan, A. Helmy, "A Comparative Study of Mobility Prediction Schemes for GLS Location Service", IEEE VTC, Vol. 5, pp. 3125-3129, Sept 2004.
  24. D. Bhattacharjee, A. Rao, C. Shah, M. Shah, A. Helmy, "Empirical Modeling of Campus-wide Pedestrian Mobility: Observations on the USC Campus", IEEE VTC, pp. 2887 - 2891, Sept 2004.
  25. K. Nahm, A. Helmy, C.-C. J. Kuo, "On the Interaction between MAC and Transport Layers for Media Streaming in 802.11 Ad-hoc Networks", SPIE ITCOM, October 2004.
  26. R. Chitradurga, A. Helmy, "Analysis of Wired Short Cuts in Wireless Sensor Networks", IEEE Int'l Conference on Pervasive Services (ICPS), pp. 179-188, July 2004. [ppt]
  27. S. Tanachaiwiwat, P. Dave, R. Bhindwale, A. Helmy, "Location-centric Isolation of Misbehavior and Trust Routing in Energy-constrained Sensor Networks", IEEE Workshop on Energy-Efficient Wireless Communications and Networks (EWCN), IEEE IPCCC, pp. 463-470, April 2004.
  28. F. Bai, A. Helmy, "Comparative Analysis of Algorithms for Tree Structure Restoration in Sensor Network", IEEE EWCN Workshop IEEE IPCCC, pp. 385-392, April 2004.
    29. Refereed Posters
  29. K. Merchant, W. Hsu, H. Shu, C. Hsu, A. Helmy, "Weighted Way Mobility Model and its Impact on Ad Hoc Networks", ACM MobiCom, Sept 2004.
  30. S. Ebrahimi, A. Helmy, S. Gupta, "A Systematic Simulation-based Study of Adverse Impact of Short-lived TCP Flows on Long-lived TCP Flows", ACM SIGCOMM, August 2004.
  31. J. Faruque, K. Psounis, A. Helmy, "Analysis of Gradient-based Routing Protocols in Sensor Networks", ACM SIGCOMM, August 2004.
  32. D. Bhattacharjee, A. Rao, C. Shah, M. Shah, A. Helmy, "Trace-based Mobility Modeling for Campus-wide Mobile Ad-hoc Networks", ACM SIGCOMM, August 2004.
  33. G. Grewal, S. Pradhan, S. Sharma, V. Alatzeth, A. Helmy, "A Comparative Study of Mobility Prediction Schemes for Grid Location Service", ACM SIGCOMM, August 2004. [pdf, ppt]
  34. A. Das, D. Dutta, A. Goel, J. Heidemann, A. Helmy, "Lower Bounds for Approximate Fairness", ACM SIGCOMM, August 2004.

2003

  1. F. Bai, N. Sadagopan, A. Helmy, "The IMPORTANT Framework for Analyzing the Impact of Mobility on Performance of Routing for Ad Hoc Networks", Ad Hoc Networks Journal - Elsevier, Vol. 1, Issue 4, pp. 383 - 403, November 2003. [Acceptance rate: 12%][Nominated for best paper award at USC EE Dept, 2004]. On the top 25 most requested articles (Ad Hoc Networks Journal) for Jan-Dec'03 & Jan-Mar'04.
  2. A. Helmy, "Mobility-Assisted Resolution of Queries in Large-Scale Mobile Sensor Networks (MARQ)", Computer Networks Journal - Elsevier, Special issue on Wireless Sensor Networks, Vol. 43, Issue 4, pp. 437-458, November 2003. [Acceptance rate: 24% of 25 submissions].
  3. A. Helmy, "Small Worlds in Wireless Networks", IEEE Communications Letters, pp. 490-492, Vol. 7, No. 10, October 2003.
  4. J. Faruque, A. Helmy, "Gradient-Based Routing in Sensor Networks", ACM Mobile Computer and Communications Review (MC2R), Vol. 7, No. 4, pp. 50-52, October 2003.
  5. K. Seada, A. Helmy, R. Govindan, "On the Effect of Location Inaccuracy on Geographic Face Routing in Wireless Networks", ACM MC2R, Vol. 7, No. 4, pp. 61-63, October 2003.
    6. Conference Papers
  6. N. Sadagopan, F. Bai, B. Krishnamachari, A. Helmy, "PATHS: analysis of PATH duration Statistics and their impact on reactive MANET routing protocols", ACM MobiHoc, pp. 245-256, June 2003. [Acceptance rate: 15% of 189 submissions]. [ppt]
  7. F. Bai, N. Sadagopan, A. Helmy, "IMPORTANT: A framework to systematically analyze the Impact of Mobility on Performance of RouTing protocols for Adhoc NeTworks", IEEE INFOCOM, pp. 825-835, San Francisco, CA, April 2003. [Acceptance rate: 20% of 1078 submissions] [Paper selected to the Ad Hoc Networks Journal for fast-track publication] [ppt]
  8. A. Helmy, "TRANSFER: Transactions Routing for Ad-hoc Networks with eFficient EneRgy", IEEE GLOBECOM (Global Telecom. Conf), pp. 398-404, December 2003. [Acceptance: 27%].
  9. G. Bhaskara, A. Helmy, S. Gupta, "Micro Mobility Protocol Design and Evaluation: A Parameterized Building Block Approach", IEEE Vehicular Technology Conference (VTC), Symposium on IP Mobility, pp.2019-2024 October 2003. [Acceptance rate: 19% of 76].
  10. Y. Kim, J. Lee, A. Helmy, "Impact of Location Inconsistencies on Geographic Routing in Wireless Networks", ACM Wkshp on Modeling, Analysis, Simulation of Wireless Mobile Systems (MSWIM), with ACM MobiCom, pp.124-127, Sept '03. [Acceptance rate: 15% of 103]
  11. N. Sadagopan, B. Krishnamachari, A. Helmy, "The ACQUIRE Mechanism for Efficient Querying in Sensor Networks", First IEEE International Workshop on Sensor Network Protocols and Applications (SNPA), in conjunction with IEEE ICC, pp. 149-155, May 2003. [Acceptance: 37%].
  12. A. Helmy, S. Garg, P. Pamu, N. Nahata, "Contact Based Architecture for Resource Discovery (CARD) in Large Scale MANets", IEEE/ACM IPDPS Int'l Workshop on Wireless, Mobile and Ad Hoc Networks (WMAN), pp. 219-227, Apr 2003. [Acceptance: 29%] [Paper selected for forwarding to the ACM MONET Journal for review and publication].
    13. Refereed Posters
  13. J. Faruque, A. Helmy, "Gradient-Based Routing in Sensor Networks", ACM MobiCom, Sept 2003, IEEE ICNP Nov. 2003
  14. K. Seada, A. Helmy, R. Govindan, "On the Effect of Location Inaccuracy on Geographic Face Routing in Wireless Networks", ACM MobiCom, Sept 2003, ACM SenSys, Nov. 2003.
  15. K. Seada, A. Helmy, "Rendezvous Regions: A Scalable Architecture for Service Location and Data-Centric Storage in Large-Scale Wireless Networks", ACM MobiCom, Sept 2003, ACM SIGCOMM, August 2003.
  16. S. Wang, A. Helmy, "Effects of Small Transfers and Traffic Patterns on Performance and Cache Efficacy of Ad Hoc Routing", ACM MobiCom, September 2003, IEEE ICNP, Nov. 2003.
  17. D. Son, J. Park, A. Helmy, "Mobility-Induced Location Errors and its Effect on Geographic Routing in Ad Hoc Networks", ACM MobiCom, September 2003.
  18. A. Das, D. Dutta, A. Helmy, "A Low-state Packet Marking Framework for Approximate Fair Bandwidth Allocation", IEEE ICNP, Nov. 2003.
  19. S. Begum, S. Gupta, A. Helmy, "An Error Oriented Test Generation (EOTG) Framework for Wireless Adhoc MAC Protocols", IEEE ICNP, November 2003.
  20. S. Tanachaiwiwat, P. Dave, R. Bhindwale, A. Helmy, "Insecure Location Avoidance and Routing on Trust in Location-aware Sensor Networks", IEEE ICNP, November 2003, ACM SenSys, Nov. 2003.

2002

  1. A. Helmy, M. Jaseemuddin, G. Bhaskara, "Efficient Micro-Mobility using Intra-domain Multicast-based Mechanisms (M&M)", ACM SIGCOMM Computer Communications Review (CCR), Volume 32, Number 5, pp. 61-72, November 2002.
  2. N. Nahata, P. Pamu, S. Garg, A. Helmy, "Efficient Resource Discovery for Large Scale Ad hoc Networks using Contacts", ACM SIGCOMM CCR, Vol. 32, No. 3, pp. 32, July 2002.
  3. K. Dantu, S. Kapadia, R. Sinha, A. Helmy, "Modeling of Mobility-Induced Losses in MANETs (MILMAN)", ACM SIGCOMM CCR, Vol. 32, No. 3, pp. 30, July 2002.
    4. Conference Papers
  4. A. Das, D. Dutta, A. Helmy, "Fair Stateless Aggregate Marking using Active Queue Management Techniques", 5th IEEE/IFIP Int'l Conference on Management of Multimedia Networks and Services (MMNS), pp. 211-223, Santa Barbara, CA, October 2002. (Best Paper Award)
  5. A. Helmy, "Architectural Framework for Large-Scale Multicast in Mobile Ad Hoc Networks", IEEE International Conference on Communications (ICC), Vol. 4, pp. 2036-2042, April 2002. [ppt, pdf]
  6. A. Helmy, "State Analysis and Aggregation Study for Multicast-based Micro Mobility", IEEE International Conference on Communications (ICC), Vol. 5, pp. 3301-3306, April/May 2002. [ppt]
  7. K. Seada, A. Helmy, "Fairness Evaluation Experiments for Multicast Congestion Control Protocols", IEEE GLOBECOM, Vol. 3, pp. 2614-2618, November 2002. [Acceptance rate: 30%].
  8. K. Seada, S. Gupta, A. Helmy, "Systematic Evaluation of Multicast Congestion Control Protocols", SCS SPECTS Performance Evaluation of Computer and Telecom, pp. 857-867, July 2002.
    9. Refereed Posters
  9. N. Nahata, P. Pamu, S. Garg, A. Helmy, "Efficient Resource Discovery for Large Scale Ad hoc Networks using Contacts", ACM SIGCOMM, Aug 2002.
  10. K. Dantu, S. Kapadia, R. Sinha, A. Helmy, "Modeling of Mobility-Induced Losses in MANETs (MILMAN)", ACM SIGCOMM, August 2002. [Acceptance rate: 30% of 79 submissions].

Prior to 2002

  1. L. Breslau, D. Estrin, K. Fall, S. Floyd, J. Heidemann, A. Helmy, P. Huang, S. McCanne, K. Varadhan, Y. Xu, H. Yu, "Advances in Network Simulation", IEEE Computer, vol.33, No.5, pp. 59-67, May 2000. [Top 65 most cited papers in computer science in 2000 (Citeseer Jul '03)]
    2. Conference Papers
  2. A. Helmy, "A Multicast-based Protocol for IP Mobility Support", ACM SIGCOMM Second International Workshop on Networked Group Communication (NGC), Palo Alto, CA, ACM press, pp. 49-58, November 2000. [Acceptance rate: 24% of 49 submissions]. [ppt]
  3. A. Helmy, S. Gupta, D. Estrin, A. Cerpa, Y. Yu, "Systematic Performance Evaluation of Multipoint Protocols", IFIP Formal Description Techniques & Protocol Specification, Testing, and Verification (FORTE/PSTV), pp. 187-202, October 2000. [Acceptance: 34% of 63].
  4. S. Begum, M. Sharma, A. Helmy, S. Gupta, "Systematic Testing of Protocol Robustness: Case Studies on Mobile IP and MARS", IEEE LCN, Florida, pp. 369-380, November 2000.
  5. A. Helmy, D. Estrin, S. Gupta, "Systematic Testing of Multicast Routing Protocols: Analysis of Forward and Backward Search Techniques", IEEE ICCCN (IC3N), pp. 590-597, October 2000.
  6. D. Estrin, M. Handley, A. Helmy, P. Huang, D. Thaler, "A Dynamic Bootstrap Mechanism for Rendezvous-based Multicast Routing", IEEE INFOCOM, Vol. 3, pp. 1090-1098, March 1999. [Acceptance rate: 30% of 600 submissions].
  7. A. Helmy, D. Estrin, S. Gupta, "Fault-oriented Test Generation for Multicast Routing Protocol Design", IFIP FORTE/PSTV, Paris, pp. 93-109, November 1998. [Acceptance rate: 30% of 85].
  8. A. Helmy, D. Estrin, "Simulation-based `STRESS' Testing Case Study: A Multicast Routing Protocol", IEEE Sixth Int'l Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS), Montreal, Canada, pp. 36-43, July 1998.
    9. Internet Standards & RFCs
  9. D. Estrin, D. Farinacci, A. Helmy, D. Thaler, S. Deering, V. Jacobson, M. Handley, C. Liu, P. Sharma, L. Wei, "Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification", RFCs 2362 of the Internet Engineering Task Force (IETF), Inter-Domain Multicast Routing (IDMR), June 1998. [RFC2362. Earlier version as RFC2117 in 1997]
  10. D. Estrin, D. Farinacci, A. Helmy, D. Thaler, S. Deering, V. Jacobson, M. Handley, C. Liu, P. Sharma, L. Wei, "Protocol Independent Multicast (PIM): Motivation and Architecture", Proposed RFC of the IETF, Inter-Domain Multicast Routing (IDMR), October 1996.
  11. D. Estrin, D. Farinacci, A. Helmy, V. Jacobson, L. Wei, "Protocol Independent Multicast - Dense Mode (PIM-DM): Protocol Specification", Proposed IETF RFC for IDMR Internet Engineering Task Force (IETF), Inter-Domain Multicast Routing (IDMR), September 1996.
  12. A. Helmy, "Protocol Independent Multicast-Sparse Mode (PIM-SM): Implementation Document", Internet-Draft (I-D) of the IDMR/MBone Deployment (Mboned), December 1996.
  13. A. Helmy, D. Thaler, D. Estrin, L. Wei, "Protocol Independent Multicast-Sparse Mode (PIM-SM): Deployment Guidelines", Internet-Draft of the IETF/Mboned, December 1996.
  14. A. Helmy, D. Thaler, D. Estrin, "PIM Multicast Border Router (PMBR) specification for connecting PIM-SM domains to a DVMRP Backbone", Internet-Draft of IDMR, September 1996.
  15. S. Deering, W. Fenner, D. Estrin, A. Helmy, D. Farinacci, L. Wei, M. Handley, V. Jacobson, D. Thaler, "Hierarchical PIM for Inter-Domain Multicast Routing", Internet-Draft of IDMR, Dec 1995.
  16. S. Deering, W. Fenner, D. Estrin, A. Helmy, D. Farinacci, L. Wei, M. Handley, V. Jacobson, D. Thaler, "Interoperability Mechanisms for PIM and DVMRP", Internet-Draft of IDMR, Dec 1995.

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