Computer & Information Science & Engineering

Ahmed Helmy, Ph.D.

Professor

Education

Ph.D., University of Southern California, 1999
M.S., University of Southern California, 1995
B.S., University of Cairo, Egypt, 1992

Research Interests

Wireless Networks Design, Mobility Modeling, Network Simulation, Protocol Architecture & Design, Sensor Networks, Mobile Social Networks, Mobile Networks Measurement

Publications

For the latest publications and more complete list please visit www.cise.ufl.edu/~helmy

W. Hsu, A. Helmy, "On Nodal Encounter Patterns in Wireless LAN Traces", IEEE Transactions on Mobile Computing (TMC), June 2010 (to appear).

S. Moghaddam, A. Helmy, S. Ranka, M. Somaya, "Data-driven Co-clustering Model of Internet Usage in Large Mobile Societies", 13th ACM Int'l Conf on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWIM), Oct 2010.

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. [Conference version appeared in IEEE INFOCOM, pp.758-766, May 2007]

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.

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.

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.

F. Bai, N. Sadagopan, A. Helmy, "The IMPORTANT Framework for Analyzing the Impact of Mobility on Performance of Routing for Ad Hoc Networks", AdHoc Networks Journal - Elsevier Science, Vol. 1, Issue 4, pp. 383-403, November 2003. [Also in IEEE INFOCOM, April 2003.]

F. Bai, N. Sadagopan, B. Krishnamachary, A. Helmy, "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. [Also in ACM MobiHoc, May 2003.]

A. Helmy, "Small Worlds in Wireless Networks", IEEE Communications Letters, pp. 490-492, Vol. 7, No. 10, October 2003.

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. [Also in the IEEE Transactions on Vehicular Technology, pp. 307-319, January 2005.]

Karim Seada, Ahmed Helmy, Ramesh Govindan, "Modeling and Analyzing the Correctness of Geographic Face Routing under Realistic Conditions", IEEE/ACM (IPSN), pp. 71-80, April 2004.

N. Sadagopan, B. Krishnamachari, A. Helmy, "Active Query Forwarding in Sensor Networks (ACQUIRE)", AdHoc Networks Journal - Elsevier, Vol.3, No.1, pp.91-113, January 2005 [Also in IEEE ICC SNPA workshop, May 2003.]

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.

K. Seada, M. Zuniga, A. Helmy, B. Krishnamachari, "Energy-Efficient Forwarding Strategies for Geographic Routing in Lossy Wireless Sensor Networks", The Second ACM Conference on Embedded Networked Sensor Systems (SenSys), pp. 108-121, November 2004.

A. Helmy, M. Jaseemuddin, G. Bhaskara, "Multicast-based Mobility: A Novel Architecture for Efficient Micro-Mobility", IEEE Journal on Selected Areas in Communications (JSAC), Special Issue on All-IP Wireless Networks, Vol. 22, No. 4, pp. 677-690, May 2004.

The NS Simulator: 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.

The PIM-SM Spec: 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 & 2117 of the Internet Engineering Task Force (IETF), Inter-Domain Multicast Routing (IDMR), June 1998.