About Me (Top)

I am broadly interesed in research problems in the area of networked computer systems with an emphasis on mobile computing. In the past, I have worked on a variety of performance analysis and algorithm design problems in the context of active measurements, resource allocation, wireless security and dynamic spectrum access. I have been a research scientist in Sprint's Applied Research (IP) Group since the summer of 2005. I received my M.S. and Ph.D. degrees from the University of California at Berkeley in 2003 and 2006 respectively. Prof. Randy H. Katz was my advisor at UC, Berkeley. Prior to that, I obtained by Bachelor's degree from the Indian Institute of Technology, Madras (IIT-M) in Chennai, India.

Professional Activities (Top)

• MobiSys 2009, Proceedings Chair, 7th Annual ACM International Conference on Mobile Systems, Applications and Services
• IWQoS 2009, PC member, 17th IEEE International Workshop on Quality of Service
• INFOCOM 2009, PC member, 28th IEEE Conference on Computer Communications
• IWQoS 2008, PC member, 16th IEEE International Workshop on Quality of Service
• Broadnets 2008, PC member, 5th International Conference on Broadband Communications, Networks and Systems
• INFOCOM 2008, PC member, 27th IEEE Conference on Computer Communications
• IMC 2007, PC member, ACM/USENIX Internet Measurement Conference
• CoNEXT 2007 Student Workshop, PC member, 3rd International Conference on emerging Networking Experiments and Technologies
• IWQoS 2007, PC member, 15th IEEE International Workshop on Quality of Service

Recent Publications (Top)

• "Defending Against Sensor-Sniffing Attacks on Mobile Phones",
  Liang Cai, Sridhar Machiraju and Hao Chen,
  To appear in MobiHeld'09 (ACM SIGCOMM Workshop on Networking, Systems, Applications on Mobile Handhelds),
  August 2009.
  

• "Primary User Behavior in Cellular Networks and Implications for Dynamic Spectrum Access",
  Daniel Willkomm, Sridhar Machiraju, Jean Bolot and Adam Wolisz,
  IEEE Communications Magazine,
  Vol. 47, Issue 3, Pages 88--95, March 2009.
  

• "Primary Users in Cellular Networks: A Large-scale Measurement Study",
  Daniel Willkomm, Sridhar Machiraju, Jean Bolot and Adam Wolisz,
  DySpAN'08 (IEEE Symposium on Dynamic Spectrum Access Networks),
  Chicago, U.S.A, October 2008.
  Best Paper Award (Technical Track).
  [pdf]

• "Experiences in a 3G Network: Interplay between the Wireless Channel and Applications",
  Xin Liu, Ashwin Sridharan, Sridhar Machiraju, Mukund Seshadri and Hui Zang,
  Mobicom'08 (The 14th ACM Annual International Conference on Mobile Computing and Networking),
  San Francisco, U.S.A, September 2008.
  [pdf]

• "A City-Wide Vehicular Infrastructure for Wide-area Wireless Experimentation",
  Justin Ormont, Jordan Walker, Suman Banerjee, Ashwin Sridharan, Mukund Seshadri and Sridhar Machiraju,
  WiNTECH'08 (The 3rd ACM International Workshop on Wireless Network Testbeds, Experimental Evaluation and Characterization),
  San Francisco, U.S.A, September 2008.
  [pdf]

• "Mobile Call Graphs: Beyond Power-Law and Lognormal Distributions",
  Mukund Seshadri, Sridhar Machiraju, Ashwin Sridharan, Jean Bolot, Christos Faloutsos and Jure Leskovec,
  KDD'08 (The 14th ACM SIGKDD International Conference on Knowledge Discovery & Data Mining),
  Las Vegas, U.S.A, August 2008.
  [pdf]

• "PAQ: A Starvation-resilient Alternative to Proportional Fair",
  Soshant Bali, Sridhar Machiraju and Hui Zang,
  ICC 2008 (IEEE International Conference on Communications),
  Beijing, China, May 2008.
  [pdf]

• "Distributed Authentication for Low-Cost Wireless Networks",
  Sridhar Machiraju, Hao Chen and Jean Bolot,
  HotMobile 2008 (The 9th Workshop on Mobile Computing Systems and Applications),
  Napa Valley, U.S.A, February 2008.
  [pdf]

Older Publications (Top)

• "On Optimal Probing for Delay and Loss Measurement",
  Francois Baccelli, Sridhar Machiraju, Darryl Veitch and Jean Bolot,
  IMC 2007 (ACM SIGCOMM/USENIX Internet Measurement Conference),
  San Diego, U.S.A, October 2007.
  [pdf] [ps]

• "A Measurement Study of Scheduler-based Attacks in 3G Wireless Networks",
  Soshant Bali, Sridhar Machiraju, Hui Zang and Victor Frost,
  PAM 2007 (Passive and Active Measurement Conference),
  Louvain-la-neuve, Belgium, April 2007.
  [pdf] [ps]

• "Beyond Proportional Fair: Designing Robust Wireless Schedulers",
  Soshant Bali, Sridhar Machiraju and Hui Zang,
  Extended Abstract, IFIP-LNCS Networking,
  Atlanta, Georgia, May 2007.
  [pdf] [ps]

• "Adding Definition to Active Probing",
  Sridhar Machiraju, Darryl Veitch, Francois Baccelli and Jean Bolot,
  ACM Computer Communication Review,
  Volume 37, Issue 2, April 2007.
  [pdf] [ps]

• "The Role of PASTA in Network Measurements",
  Francois Baccelli, Sridhar Machiraju, Darryl Veitch and Jean Bolot,
  SIGCOMM'06 (Annual ACM Conference of the Special Interest Group on Data Communication),
  Pisa, Italy, September 2006.
  [pdf] [ps]

• "A Measurement-Friendly Network Architecture",
  Sridhar Machiraju and Darryl Veitch,
  INM'06 (ACM SIGCOMM Workshop on Internet Network Management),
  Pisa, Italy, September 2006.
  [pdf] [ps]

• "Theory and Practice of Cross-Traffic Estimation",
  Sridhar Machiraju, Darryl Veitch, Francois Baccelli, Antonio Nucci and Jean Bolot,
  Extended Abstract, SIGMETRICS'05 (Annual ACM Conference on Measurement and Modeling of Computer Systems),
  Banff, Canada, June 2005.
  [pdf] [ps]

• "Verifying Global Invariants in Multi-Provider Distributed Systems",
  Sridhar Machiraju and Randy H. Katz,
  HotNets-III (3rd Workshop on Hot Topics in Networks),
  San Diego, California, November 2004.
  [pdf] [ps]

• "A Scalable and Robust Solution for Bandwidth Allocation",
  Sridhar Machiraju, Mukund Seshadri and Ion Stoica,
  IWQoS 2002 (10th International Workshop on Quality of Service),
  Miami Beach, Florida, May 2002.
  [pdf] [ps]

• "An Adaptive Hierarchical Scheme for Bandwidth Allocation in Cellular Networks",
  Sridhar Machiraju and C. Sivaram Murthy,
  PIMRC 2002 (13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications),
  Lisboa, Portugal, September 2002.
  [pdf] [ps]

• "The SAHARA Model for Service Composition Across Multiple Providers",
  Bhaskaran Raman, Sharad Agarwal, Yan Chen, Matthew Caesar, Weidong Cui, Per Johansson, Kevin Lai, Tal Lavian, Sridhar Machiraju, Z. Morley Mao, George Porter, Timothy Roscoe, Mukund Seshadri, Jimmy Shih, Keith Sklower, Lakshminarayanan Subramanian, Takashi Suzuki, Shelley Zhuang, Anthony D. Joseph, Randy H. Katz, Ion Stoica,
  Invited Paper, Pervasive 2002 (International Conference on Pervasive Computing),
  Zurich, Switzerland, August 2002.
  [pdf] [ps]

Technical Reports (not peer-reviewed) (Top)

• "Theory and Practice of Non-intrusive Active Network Measurements",
  Sridhar Machiraju,
  Ph.D. Dissertation, May 2006.
  [pdf] [ps]

• "Leveraging BGP Dynamics to Reverse-Engineer Routing Policies",
  Sridhar Machiraju and Randy H. Katz,
  UCB Technical Report UCB/EECS-2006-61, May 2006.
  [pdf] [ps]

• "Reconciling Cooperation with Confidentiality in Multi-Provider Distributed Systems",
  Sridhar Machiraju and Randy H.Katz,
  UCB Technical Report UCB/CSD-04-1345, August 2004.
  [pdf] [ps]

• "SCONE: A Tool to Estimate Shared Congestion Among Internet Paths",
  Weidong Cui, Sridhar Machiraju, Randy H.Katz and Ion Stoica,
  UCB Technical Report UCB/CSD-04-1320, May 2004.
  [pdf] [ps]