Associate Professor of Computer Networks
and Information Science and Engineering (CISE) Department
Founder and Director: Mobile and
Sensor Networks Laboratory (the NOMADS group)
University of Florida, Gainesville
email: helmy at ufl.edu
Dr. Ahmed Helmy is conducting research on design and analysis of mobile ad
hoc networks and wireless sensor networks, in addition to protocol testing
techniques. He currently has three active NSF projects (MARS,
ACQUIRE and STRESS).
In 2002, Dr. Helmy received the National Science
Foundation (NSF) CAREER
for his research on
'Resource Discovery, Query Resolution, Rendezvous and Mobility Modeling in
Large-Scale Wireless Ad Hoc and Sensor Networks' (also called
MARS). His current research
interests lie in the areas of modeling and analysis of mobile wireless
networks, robust protocol design for ad hoc and sensor networks
(geographic routing and efficient query resolution), network
security and systematic design and stress testing of networking protocols.
Since 2002, Dr. Helmy has led the
(funded by NSF,
Intel and Pratt&Whitney) on efficient architectures and protocols for
large-scale ad hoc and sensor networks. He developed the IMPORTANT mobility
simulation tool with his group under the MARS project. He is also
co-leading the NSF funded project
'Data-centric Active Querying in Sensor
Networks'. Furthermore, he is leading the NSF/NASA funded project for
highly dependable protocols (
From 1998-2002 STRESS
was funded by DARPA to develop scenario generation algorithms
for multicast protocols.
He has also led the M&M project (funded by Nortel and Intel)
to develop a
multicast-based mobility protocol for efficient IP mobility support.
He has worked on the VINT
projects at USC and USC/ISI.
In addition, he received the Zumberge award (2000) to pursue work on
power-aware wireless routing protocols. He founded and directed
the wireless networking laboratory at USC's Electrical Engineering
from 1999 until 2006 (from his HP grant), and co-founded and co-directed
the sensor networking laboratory at USC from 2005-2006.
He also founded and is currently directing the mobile networking
laboratory at the CISE department at the University of Florida.
Most recently, Dr. Helmy is studying wireless user behavior through
trace-based analyses. He has initiated an effort to form a community-wide
mobility library of Wireless LAN measurements (MobiLib) with millions
(I am teaching CNT5106C Computer Networks in Fall'08 at
Selected Publications [click here for a
Projects: MARS, ACQUIRE, M&M, STRESS, AQM-marking, VINT/NS, PIM
MARS PROJECT: Resource Discovery, Query Resolution, Rendezvous
and Mobility Modeling in Large-Scale Wireless Ad Hoc and Sensor Networks
[A related project on active querying in sensor
has started with funding from
MARS Selected Publications: (For more complete list of
publications please check the updated CV)
- Mobility Modeling and Analysis:
mobility tool (includes Freeway, Manhattan, Group and
RandomWaypoint mobility models).
- The PATHS mobility analysis:
F. Bai, N. Sadagopan, B. Krishnamachari, A. Helmy, "Modeling
Path Duration Distributions in MANETs and their Impact on Routing
Performance", IEEE Journal on Selected Areas of Communications
(JSAC), Vol. 22, No. 7, pp. 1357-1373, September 2004.
Earlier version appeared in
(Acceptance rate: 15%)]
Summary: This study investigates fundamental
characteristics of mobile networks connectivity. It shows that, contrary
to common assumptions, that the 'link' durations in mobile
networks are 'not' exponentially distributed. It further establishes, for
the first time, that the shortest 'path' duration is indeed 'exponentially
distributed' for random and correlated mobility models.
These results are used to establish first order models for throughput and
overhead in ad hoc networks using path duration statistics.
- F. Bai, N. Sadagopan, A. Helmy, "The
IMPORTANT Framework for Analyzing the Impact of
Performance of Routing for Ad Hoc Networks", AdHoc Networks Journal
- Elsevier, Vol. 1, Issue 4, pp. 383-403, November 2003.
version appeared at IEEE INFOCOM ,
April 2003, San Francisco (Acceptance rate: 20%)]
INFOCOM presentation slides
Summary: This study introduces the IMPORTANT framework for
systematic modeling and characterization of mobility by presenting
the concept of mobility dimensions and metrics. Mobility dimensions
include spatial correlation, temporal correlation and obstacles.
A 'rich' set of mobility models (Manhattan, Freeway, Group and Random
mobility) are identified to span these dimensions.
The study challenges the common practice of using random
mobility in wireless networking research, and clearly establishes the need
for more realistic mobility models. This is achieved by
showing the drastic difference between ad hoc routing performance over
realistic mobility and that over random mobility.
Using a building-block analysis, the study also answers questions of how
and why mobility modeling is important.
- Trace-based Mobility (MobiLib: The
- * New * W. Hsu, A. Helmy, "IMPACT:
Mobile-user Patterns Across University
Campuses using WLAN Trace Analysis", USC Technical
Report, July 2005. [Submitted for review] [Longer
Summary: This paper provides the most comprehensive study of
WLAN traces to date. Traces collected from four major
universities (~12,000 users) are analyzed using metrics for individual
user and group
behaviors. Similarities and differences across campuses are studied.
Conclusions provide great insight into realistic behavior of wireless
users. Most users are 'on' for a small fraction of the time, number of
access points visited (per user) is quite low, and on-line user mobility
is quite low. On average, a user encounters only 2%-6% of the user
population. Encounter-graphs and small worlds are introduced to
model encounter patterns between users.
We find that number of encounters follows a biPareto distribution and
the frienship indexes follow exponential distributions. A
paradigm for 'encounter-based information diffusion' is introduced for
efficient data dissemination in mobile networks.
- * New *
W. Hsu, A. Helmy, "Analyzing Principal Characteristics of User
Association Patterns and Eigen-behavior in Wireless LAN Traces", November
2005. [Submitted for review]
W. Hsu, K.
Merchant, H. Shu,
C. Hsu, A. Helmy, "Weighted
Waypoint Mobility Model and its Impact on Ad Hoc Networks", ACM
Mobile Computer Communications Review (MC2R) (among the best MobiCom
'04 posters), Jan 2005.
- * New * F. Bai, A. Helmy,
of Mobility on Mobility-Assisted
Information Diffusion (MAID) Protocols", USC Technical Rreport,
July 2005. [Submitted for review] [Longer, more
complete, 29-page version]
Summary: This study analyzes a class of protocols, MAID, that
utilize mobility for information diffusion.
MAID uses encounter
information to create age gradients towards the target, and can be used
for discovering resources, routing or
locating nodes efficiently in future mobile networks.
Analytical models are developed to evaluate MAID's performance during its
various (transient and steady-state) phases of operation. Extensive
simulations are used to validate these models and to study the
sensitivity of MAID to a rich set of mobility models.
We find that although MAID is sensitive to the mobility pattern, its
steady state performance is, surprisingly, insensitive to velocity.
We identify the properties of the 'age gradient tree' as the key factor to
explain this interplay between mobility and the MAID protocols.
- Robust Geographic Protocols and Services:
- Optimal Geographic Routing:
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), Nov 2004 (14.5%
This study clearly shows the failure of conventional, distance-based,
greedy geographic routing protocols over lossy links. It further
establishes the energy-optimal strategy of geographic routing by
introducing a new quality-distance metric to measure the progress of
packet forwarding. Evaluated through mathematical analysis, extensive
simulations and test-bed experiments, our protocol achieves order of
magnitude improvement in packet delivery and energy-consumption over the
standard greedy geographic forwarding protocol.
- Effect of Inaccuracy on Face Routing:
Karim Seada, Ahmed Helmy, Ramesh Govindan, "On the
Effect of Localization Errors on Geographic Face Routing in Sensor
Networks", The Third IEEE/ACM Int'l Symposium on Information
Processing in Sensor Networks (IPSN), April 2004. [Longer
version submitted to the ACM Transcations on Sensor Networks.]
Summary: This study provides a detailed micro-level
analysis on effects of location inaccuracy on the correctness and
performance of geographic routing. A novel methodology of algorithmic
stress analysis of face routing protocols is used to establish complete
scenarios and bounds for protocol errors due to location inaccuracy.
Based on our analysis, we first prove the impossibility of correct face
routing using local algorithms. We then carefully introduce protocol
modifications to eliminate the most likely protocol errors, which leads to
near-perfect performance even with significant location errors.
- Robust Geocast:
K. Seada, A. Helmy, "Efficient
and Robust Geocasting Protocols for Sensor Networks",
Journal of Computer Communications - Elsevier, Special
Issue on Dependable Wireless Sensor Networks. Accepted Spring 2005.
Version in IEEE WCNC Mar 04]
- K. Seada, A. Helmy, "
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),
- C. Li, W. Hsu, B. Krishnamachari, A. Helmy, "A Local
for Geographic Routing with Power Control in Wireless Networks",
Conference on Sensor and Ad Hoc Communications
and Networks (SECON), September 2005 [Acceptance rate: 27%]
- Resource Discovery and Query Resolution:
- Multi-variable Query Resolution (ACQUIRE): N.
Sadagopan, B. Krishnamachari, A. Helmy, "Active
Query Forwarding in Sensor Networks (ACQUIRE)", AdHoc
Networks Journal - Elsevier, Vol.3, No.1, pp.91-113,
version in IEEE SNPA, May '03]
Summary: The ACQUIRE architecture introduces an
energy-optimal routing protocol for multi-variable queries in sensor
networks. ACQUIRE uses a look-ahead parameter, d, that can be tuned to
span the spectrum between random-walk and flooding. Through an analytical
framework, we show how d can be actively adjusted, as a function
of the network dynamics, to provide optimal query routing.
- A. Helmy, "Small
Worlds in Wireless Networks", IEEE Communications
490-492, Vol. 7, No. 10, October 2003.
Summary: This study establishes the connection between
networks (as spatial graphs) and small worlds. The
concept of 'contacts' is introduced to wireless networks and a
novel algorithm is presented to dynamically
select contacts in a practical and controlled manner. Contacts act as
short cuts to minimize the degrees of separation between wireless nodes.
The study shows that small worlds can be efficiently constructed in
wireless networks by selecting very few contacts.
This concept is used to radically improve the performance of discovery
protocols in ad hoc and sensor networks.
- 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, Nov 2003.
with links] [Abstract.]
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. [Earlier Version in IEEE
Transactions on Vehicular Technology, Jan '05]
- J. Faruque, K. Psounis, A. Helmy, "Analysis
of Gradient-based Routing Protocols in Sensor Networks", IEEE/ACM Int'l Conference on
Computing in Sensor Systems (DCOSS), June 2005.
J. Faruque, A. Helmy, "RUGGED:
on finGerprint Gradients in sEnsor Networks", IEEE Int'l Conf. on Pervasive
Services (ICPS), Jul 04. Also, among the best posters from ACM MOBICOM
Security in Ad Hoc and Sensor Networks:
", USC Technical Report, July
Y. Kim, A. Helmy, "ATTENTION:
ATTackEr Traceback using MAC
Layer AbNormality DetecTION", USC Tech Report, July
Y. Kim, A. Helmy, "SWAT: Small World-based Attacker Traceback
in Ad-hoc Networks., IEEE/ACM Mobiquitous Conference, Jul 2005.
S. Tanachaiwiwat, A. Helmy, "Correlation
analysis for alleviating
effects of inserted data in wireless sensor networks", IEEE/ACM
Mobiquitous Jul 05
- S. Tanachaiwiwat, A. Helmy, "VACCINE:
War of the
Worms in Wired and Wireless Networks
TCP over Ad Hoc:
Multicast-based Architecture for IP Mobility
Systematic Testing and Evaluation
of Networking Protocols
(Completed 4-yrs of DARPA funding) [A follow up project:
4-yr NSf/NASA-funded 'Obtaining Highly
Dependable Communication Protocols' has started in Sept '02]
- 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.
A. Helmy, "A
Multicast-based Protocol for IP
Mobility Support", ACM SIGCOMM Int'l Workshop on Networked Group
(NGC), November 2000
[Here is a library of topologies used for
the simulations of M&M (NGC), in a format compatible with the
- 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
- G. Bhaskara, A. Helmy, "TCP
over Micro Mobility Protocols: A
Systematic Ripple Effect Analysis", IEEE Vehicular Technology
Conf (VTC), Sept '04
- A. Helmy, "State Analysis
and Aggregation Study for Multicast-based
Micro Mobility", IEEE ICC,
Vol. 5, pp. 3301-3306, May 2002.
AQM-based Marking & Fairness
- 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, March 2005.
version as ACM SIGCOMM poster, August 2004. (Poster (pdf))]
- K. Seada, A. Helmy, S. Gupta, "A
Framework for Systematic Evaluation
of Multicast Congestion Control Protocols", IEEE Journal on Selected Areas in
Communications (JSAC), Special issue on
Protocol Design and Testing, Vol. 22, No. 10, Dec 2004.
version at IEEE GLOBECOM, Nov '02]
- A. Helmy, S. Gupta, D. Estrin,
STRESS Method for Boundary-point Performance
Analysis of End-to-end Multicast Timer-Suppression Mechanisms',
IEEE/ACM Transactions on Networking (ToN), Vol. 12, No. 1, pp.
44-58, February 2004.
version in FORTE/PSTV Oct 2000.]
- 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 submissions].
- A. Helmy, D. Estrin,
S. Gupta, "Systematic Testing
of Multicast Routing Protocols: Analysis of Forward and Backward Search
Techniques", The 9th International Conference on
Computer Communications and Networks (IEEE
ICCCN 2000), pp. 590-597, October 2000. Abstract.
S. Begum, M. Sharma, A. Helmy, S. Gupta, "Systematic Testing of
Protocol Robustness: Case Studies on Mobile IP and MARS",
Proceedings of the 25th annual IEEE conference on Local
Computer Networks (LCN), pp. 369-380,
Florida, November 2000. Abstract
A. Helmy, D. Estrin, S. Gupta, "Fault-oriented
Test Generation for Multicast Routing Protocol Design", Proceedings
of Formal Description Techniques & Protocol Specification, Testing,
and Verification (FORTE/PSTV),
IFIP, Kluwer Academic Publication, Paris, France, p. 93-109, November
VINT/NS PROJECT: The Virtual
Internet Network Simulation
and the Network Simulator NS-2)
- A. Das, D. Dutta, A. Helmy, A. Goel, J. Heidemann, "Low
Fairness: Lower Bounds and Practical Enforcement", IEEE
INFOCOM, March 2005.
A. Das, D. Dutta, A. Helmy,
Stateless Aggregate Marking using Active
Queue Management Techniques",
IEEE International Conference on Management of Multimedia Networks
and Services (MMNS),
pp. 211-223, October 2002. (Best Paper Award).
Multicast Routing Protocols
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",
Computer, vol. 33, No. 5, p. 59-67, May 2000. Abstract
A. Helmy, D. Estrin, "Simulation-based
`STRESS' Testing Case Study: A Multicast Routing Protocol", IEEE
Sixth International Symposium on Modeling, Analysis and Simulation of Computer
and Telecommunication Systems (MASCOTS), Montreal, Canada, July 1998.
- D. Estrin,
M. Handley, A. Helmy, P. Huang, D. Thaler, " A Dynamic
Bootstrap Mechanism for
Rendezvous-based Multicast Routing", Proceedings of IEEE INFOCOM
'99, New York, Vol. 3, pp. 1090-1098, March 1999. Abstract [Extended]
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,
RFC 2362/2117 of the Internet Engineering Task Force (IETF),
Inter-Domain Multicast Routing (IDMR), June 1998. [RFC2362]
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/IDMR, October 1996. [.ps]
D. Estrin, D. Farinacci, A. Helmy, V. Jacobson, L. Wei, "Protocol
Independent Multicast - Dense Mode (PIM-DM): Protocol Specification",
Proposed RFC of the IETF/IDMR, September 1996.
Services: Serving the following conferences/journals: (TPC
member unless stated otherwise)
- ACM SIGMOBILE general workshop coordination chair for all the
workshops of the ACM MobiCom, MobiHoc, and MobiSys
- Local arrangement co-chair for IEEE ICNP 08, Orlando, FL.
- Area Editor for the Ad Hoc Networks Journal - Elsevier, starting
- TPC for IEEE INFOCOM 08, SECON 07, ICNP 06,07,08.
- IEEE/ACM HiPC Int.l Conf on High Performance Computing (mobile
networks Track Chair), 07
- Chair of the 9th IEEE Int.l Conf. on Management of Multimedia and
Mobile Networks and Services (MMNS), October 2006.
- Program Vice-Chair for Wireless/Mobile/Sensor Networks and
Computing of IEEE Int'l Conf on Parallel and Distributed
Systems (ICPADS '06),
- IEEE International Conference on
Network Protocols (ICNP), Boston, MA, Nov 2005
- Panel organizer 'Security, cooperation,
and safety in Mobile Ubiquitous Networks', IEEE/ACM Mobiquitous. Invited
speaker at ACM Senmetrics,
- IEEE INFOCOM 2005 (Session chair).
- IEEE SNPA,
Int'l Workshop on Sensor Network Protocols and Applications (with IEEE ICC '03), SANPA '04 (Chair of
invited session), Senmetrics '05.
- ACM MOBICOM (Wkshp on Vehicular AdHoc Networks) VANET '04.
- IEEE BroadNets '04, IEEE BaseNets (Wkshp on Broadband Sensor
- IEEE WCNC, Mar'04 - IEEE Int'l
Conf on Mobile and Wireless Communication Networks (MWCN), Oct'04.
- On the Editorial Board for the Ad Hoc Networks Journal -
ElSevier (Nov. 2004-Nov. 2006)
- IEEE Int'l Workshop on Algorithms for Wireless, Mobile, Ad Hoc and
Sensor Networks (IEEE/ACM IPDPS WMAN
'04), WMAN '03,
- IEEE Workshop on Energy-Efficient
Wireless Communications and Networks
(EWCN), with IEEE IPCCC '04.
- IEEE Wkshp on Applications and Services in Wireless
Networks (ASWN), July '04, IEEE/ACM
Int'l Conf on High Performance Computing
(HiPC) '04, Med-Hoc-Net
2004, IEEE VTC
symposium on IP Mobility, Fall '03.
- MMNS '01, MMNS '02, MMNS '03,
(IEEE Int'l Conference on Management of Multimedia Networks and Services)
- IEEE SAWN '01 (Symposium on Ad Hoc Wireless Networks, with GLOBECOM)
Selected recent News:
- Nov. 08: Work on time variant community model for mobility modeling
(with Wei-Jen, Akis & Kostas Psounis) has been accepted at IEEE/ACM
Transactions on Networking. To appear soon.
- Oct 08: The work on Socially-aware communication paradigm is funded by
an NSF Nets Aware project for 3 years. A. Helmy sole PI.
- Sept 08: Congratulations to Shao-Cheng for his finalist pick in the
Mobicom '08 SRC competition for his work on 'Beware' implementation.
- Jul 08: Congratulations to Shao-Cheng Wang for passing his Ph.D.
defense !! He shall be joining Intel soon.
- Jul 08: Congratulations to Udayan Kumar for passing his MS defense !
He shall be joining the PhD program at UF where he was recently
- Citations for A. Helmy exceed 4000 (scholar.google.com)
- Teaching evaluation 5.0/5.0 for CIS6930 taught in Spring 2008.
- Jul 08: Congratulations to Wei-Jen Hsu for passing his Ph.D. defense
!! He shall be joining Cisco research soon.
- May 08: The work on Behavior-aware services in mobile networks has
been funded by a Cisco grant.
- Mar 08: I am chairing the colloquium committee for the CISE dept, and
have hosted several distinguished speakers in our seminar series in Sp08,
including: Jan (K. Almeroth, UCSB), Feb (M. Ammar, GATech and G. Bekey
USC), Mar (R. Bryant, CMU and P. R. Kumar, UIUC), among others. For a
complete list of
seminars and details about each seminar please see the
Barr Systems distinguished seminar link at the CISE website, and
- Feb 08: Papers accepted for: Shao-Cheng (WoWMoM, 7% acceptance rate to
the plenary session), Wei-Jen and Debo (WCNC), Udayan (MODUS IPSN
workshop), and Jabed (ICSN).
- Jan/Feb 08: Congratulations to Wei-Jen and Shao-Cheng for
passing their dissertation proposal exams !
- Citations for A. Helmy exceed 3500 (scholar.google.com). More
citation stats coming soon.
- Nov. 07: Two journal papers accepted at IEEE Transactions on Mobile
Computing (TMC) and ACM Transactions on Sensor Networks (TOSN).
- Oct 07: Congratulations to Sapon for passing his Ph.D. defense at
USC !! [He
is now with Innovative Scheduling in Gainesville.]
- Sept 07: Work on 'Gender-based feature analysis in Campus-wide WLANS',
Udayan Kumar, Nikhil Yadav, Ahmed Helmy, wins in the Student Research
Competition (SRC) at ACM MOBICOM (3rd place prize). [Mobicom is the
premier conference on wireless networks.]
Work on 'Profile-cast: Behavior-Aware Mobile Networking', Wei-Jen Hsu,
Debojyoti Dutta, Ahmed Helmy, ranks 5th in the ACM MOBICOM SRC.
- Sept 07: Citations for A. Helmy exceed 3000 on Google scholar
(excluding survey papers!).
- June-Sept 07: Nomads group has 9 presentations at Mobicom:
presentation at SRC finalists, invited talk at Crawdad, Mobicom short
paper, 1 full paper & demo at Chants, 2 posters in ACM Mobicom SRC, 2
posters at Crawdad.
- June 07: The work on 'Mining Behavioral Groups in Large Wireless
LANs' (short paper) with Wei-Jen Hsu and Debo Dutta, accepted at ACM
MOBICOM 07 (rate ~11%, 27 of 233 submissions).
- May 07: Congratulations to: Jabed for passing Ph.D. defense !! [to
join Cisco], Shirin and Ganesh for passing Ph.D. quals.
- Apr 07: Number of citations for A. Helmy is over 2800 overall
(scholar Google), up from ~1730 in
- Apr 07: Two papers to be presented at IEEE BroadNets 07.
- Feb 07: The MAID paper accepted at the IEEE SECON 07 (Acceptance rate:
- Nov. 06: The 'Time-variant Tiered-Community Mobility Model'
paper accepted at the IEEE INFOCOM 07 (Acceptance
rate below 18%).
- Sept. - Oct. 06: Journal paper accepted to the Journal on AdHoc
Networks - Elsevier.
A. Helmy to chair the Mobile/Sensor Networks track for the
HiPC'07 conference in India.
- Aug 06: Top 0.43% most cited CS authors (CiteSeer) with over
1000 citations. (Search Google Scholar for updated citations)
- June - Oct 06: Posters accepted to ACM Mobicom, and IEEE SECON. Papers
accepted to IEEE LCN, ACM SASN security workshop and IEEE SSS security
workshop. These papers/posters were presented Aug - Nov 06.
- Aug 06: A. Helmy appointed as the ACM SIGMOBILE workshop
coordinator/chair for 07 to coordinate workshops for MobiCom, MobiHoc,
MobiSys and SenSys Conferences.
- Fall 06: A. Helmy moves to University of Florida as Asssociate
Professor in the CISE Dept. Tenure file ranked by experts in college of
Eng in the top 10 in 20 years! The Nomads group/lab moves to UF.
- Jul 06: A. Helmy ranks 1st in the 2005 annual merit review in the EE
Dept at USC, among 40 faculty in EE, for the 2nd year in a row.
- Summer 06: Yongjin Kim passes Ph.D. defense.
Congratulations! He is
now with QualComm heading an effort on wireless security. Sapon passes his
quals exam at USC. Wei-Jen and Shao-Cheng pass their EEE degree exams at
- Jan '06 - Feb '06: A. Helmy chairing the
IEEE ICPADS 2006 Wireless
and Sensor Networks track. Also elected to Chair the IEEE MMNS 2006
conference. To serve on the TPC for
IEEE SECON and
ICNP 2006 Conferences.
- Jan '06 - Feb '06: Two papers accepted to IEEE WiNMee 2006 workshop on
wireless network measurements. Five papers accepted to IEEE INFOCOM 2006
- Jan '06: Jabed and Yongjin pass their qualifying exam.
- Oct 2005: Tutorial on 'Mobility Modeling for Wireless Networks'
Int'l Conf on Communications and Computer Networks
- Aug 2005: Annual Merit Review in 2004
for the EE Dept for A. Helmy: 5.0/5.0 in research,
5.0/5.0 in teaching. Ranked 1st among 39 faculty
- Aug 2005: The USC WLAN traces are now added to the mobility library
MobiLib. Second release of
mobility tools is available.
- August 2005: Top 0.47% most cited authors in Computer
citations] (Search Google Scholar)
- Jul 2005: Invited Talk
at the IEEE/ACM Senmetrics workshop. Panel lead
and moderator at IEEE/ACM Mobiquitous Conference (slides .ppt).
- May/June 2005: Initiated a community-wide library of mobile wireless
networks traces (MobiLib).
Paper accepted at IEEE
- May/June 2005: R. Govindan, A. Helmy and B. Krishnamachari established
the new wireless and sensor networking laboratory in the new
- May/June 2005: Karim Seada, Fan Bai and Narayanan Sadagopan passed
their PhD defense exams. Congratulations ! Fan is at General Motors
research labs, Karim is at Nokia research labs and Nara is at Yahoo!
- March '05: Paper (and 2 posters) accepted to ACM MOBIHOC
2005 (acceptance rate: 14%)
- March '05: Two papers (and 3 posters) presented at IEEE
INFOCOM 2005 (acceptance rate 17%). Paper accepted to
- Nov '04: Paper presented at ACM SenSys 2004
(acceptance rate 14.5%)
- Sept '04: New NSF funded project, ACQUIRE on querying
in sensor networks, has started.
- Jan '04: Release of the IMPORTANT mobility
simulation tool (also contributed to NS-2).
- Recent/Selected Invited Talks: Univ. of Florida (April
06), Northeastern U (April 06), UC-Riverside (March 06), UC-Merced
(March06), U. Oregon (March 06), UC-Riverside (Nov05), MIT (Jun05) [presentation
.ppt (4.7MB)], Boston U (Jun05),
UC-Santa Barbara (Jun05), UC-Irvine (May05), UIUC (Jun04), U Maryland
(Jun04), UCLA (May04), GA Tech (Mar04).
Some Gators News:
- Aug 08: Tamer Kahveci and
his group win best paper award in
prestigious Computational Systems Biology conference.
- Apr 08: (US News & World Report) UF's Computer Engineering department
graduate program ranked
in the top 15 among the nation's public institutions (up 6
last year's). UF's Engineering School's graduate program ranked 14th among
the public institutes in the US, up 3 from last year's ranking (24th
up 2 from last year's).
- Mar 08:
Jermaine awarded Sloan fellowship. Prabhat Mishra
awarded NSF CAREER award. Ben
Lock wins best paper award in
the IEEE Virtual Reality 2008 Conference. More info on the CISE website.
- June 07:
and Alin Dobra
of the CISE dept at UF won the Best
Paper Award in the ACM SIGMOD conference. Congrats !!
- May/Aug 07: Gainesville
#1 by the Cities, ranked and rated and ranked
in the best College towns.
- Mar/Apr 07: Gators Engineering: Seven NSF CAREER Awards in 2007
from UF College of
Engineering [#1 nationally, tied with MIT]. Two from the CISE
Dept. (bringing total to 9+ CAREER/PYI
Awards at CISE). Two in the wireless networking area. Overall UF got 10
CAREER awards in 07 (#1
- Shigang Chen, and Ben Lock win CAREER Awards in
CISE. Oliver (Dapeng) Wu wins
CAREER Award in ECE.
Other recent winners of the CAREER Award in CISE include Alin Dobra
Chris Jermaine, and
- Apr 07, Gators: College National Champions: Basketball 07,
Football 06, Basketball 06... First ever to combine both in the same year.
Teaching and Courses
- Average course evaluations through '04 ~4.66/5.
- CNT5106 Computer
Networks, Fall '08
Computer Networks Fundamentals, Fall'07.
- CIS6930 (Spring '07) Wireless Mobile Networks Design and Analysis at
- EE-579 (Spring '05, Spring '06) Wireless and Mobile Networks Design
- EE-599: Wireless and Mobile Networks Design and
'04, Spring '03, EE-499 Spring '02,
EE-555: Broadband Networks Architecture. (Fall ’99, Spring ’00, Fall ’00,
Fall '01, Fall
'02, Spring '03, Fall
'03, Sp '04, Fall '05, Sp '05).
Teaching evaluations and statistics [Fall 99 - Fall 04].
Enter author name or description (e.g., "Helmy", "Helmy Multicast",
"Helmy Protocol", "Helmy
Simulation", "Helmy Mobility", etc.) to get citations and references from
Here is a direct
link to my Google citations.