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Browsing MIT Open Access Articles by Author "Balakrishnan, Hari"

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Browsing MIT Open Access Articles by Author "Balakrishnan, Hari"

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  • Thiagarajan, Arvind; Ravindranath, Lenin; Balakrishnan, Hari; Madden, Samuel R.; Girod, Lewis D. (USENIX Association, 2011-03)
    CTrack is an energy-efficient system for trajectory mapping using raw position tracks obtained largely from cellular base station fingerprints. Trajectory mapping, which involves taking a sequence of raw position samples ...
  • Ng, Man Cheuk; Fleming, Kermin Elliott; Vutukuru, Mythili; Gross, Samuel; Mithal, Arvind; Balakrishnan, Hari (Institute of Electrical and Electronics Engineers, 2010-10)
    Over the past few years, researchers have developed many crosslayer wireless protocols to improve the performance of wireless networks. Experimental evaluations of these protocols have been carried out mostly using ...
  • Deng, Shuo; Balakrishnan, Hari; LaCurts, Katrina Leigh; Goyal, Ameesh K. (Association for Computing Machinery (ACM), 2013-10)
    Cloud computing infrastructures are increasingly being used by network-intensive applications that transfer significant amounts of data between the nodes on which they run. This paper shows that tenants can do a better job ...
  • Ravindranath, Lenin; Thiagarajan, Arvind; Balakrishnan, Hari; Madden, Samuel R. (Association for Computing Machinery (ACM), 2012-02)
    A growing class of smartphone applications are tasking applications that run continuously, process data from sensors to determine the user's context (such as location) and activity, and optionally trigger certain actions ...
  • Kaler, Timothy; Lynch, John Patrick; Peng, Timothy; Sivalingam, Lenin Ravindranth; Thiagarajan, Arvind; Balakrishnan, Hari; Madden, Samuel R. (Association for Computing Machinery, 2010-01)
    Modern smartphones are equipped with a wide variety of sensors including GPS, WiFi and cellular radios capable of positioning, accelerometers, magnetic compasses and gyroscopes, light and proximity sensors, and cameras. ...
  • Vutukuru, Mythili; Balakrishnan, Hari; Jamieson, Kyle (Association for Computing Machinery (ACM), 2009)
    This paper presents SoftRate, a wireless bit rate adaptation protocol that is responsive to rapidly varying channel conditions. Unlike previous work that uses either frame receptions or signal-to-noise ratio (SNR) estimates ...
  • Vutukuru, Mythili; Balakrishnan, Hari; Jamieson, Kyle (Association for Computing Machinery, 2009-08)
    This paper presents SoftRate, a wireless bit rate adaptation protocol that is responsive to rapidly varying channel conditions. Unlike previous work that uses either frame receptions or signal-to-noise ratio (SNR) estimates ...
  • Popa, Raluca Ada; Redfield, Catherine M.; Zeldovich, Nickolai; Balakrishnan, Hari (Association for Computing Machinery (ACM), 2011-10)
    Online applications are vulnerable to theft of sensitive information because adversaries can exploit software bugs to gain access to private data, and because curious or malicious administrators may capture and leak data. ...
  • Qureshi, Asfandyar; Weber, Rick; Balakrishnan, Hari; Guttag, John V.; Maggs, Bruce (Association for Computing Machinery / ACM Special Interest Group on Data Communications, 2009-08)
    Energy expenses are becoming an increasingly important fraction of data center operating costs. At the same time, the energy expense per unit of computation can vary significantly between two different locations. In this ...
  • Qureshi, Asfandyar; Weber, Rick; Balakrishnan, Hari; Guttag, John V.; Maggs, Bruce (Association for Computing Machinery, 2009-08)
    Energy expenses are becoming an increasingly important fraction of data center operating costs. At the same time, the energy expense per unit of computation can vary significantly between two different locations. In this ...
  • Walfish, Michael; Vutukuru, Mythili; Balakrishnan, Hari; Karger, David R.; Shenker, Scott (Association for Computing Machinery, 2010-03)
    This article presents the design, implementation, analysis, and experimental evaluation of speak-up, a defense against application-level distributed denial-of-service (DDoS), in which attackers cripple a server by sending ...
  • Winstein, Keith J.; Balakrishnan, Hari (Association for Computing Machinery, 2011-11)
    This paper argues that the bar for the incorporation of a new subnetwork or link technology in the current Internet is much more than the ability to send minimum-sized IP packets: success requires that TCP perform well ...
  • Iannucci, Peter A.; Fleming, Kermin Elliott; Perry, Jonathan; Balakrishnan, Hari; Shah, Devavrat (Association for Computing Machinery (ACM), 2012-10)
    Spinal codes are a recently proposed capacity-achieving rateless code. While hardware encoding of spinal codes is straightforward, the design of an efficient, high-speed hardware decoder poses significant challenges. We ...
  • Sivalingam, Lenin Ravindranth; Newport, Calvin Charles; Balakrishnan, Hari; Madden, Samuel R. (USENIX Association, 2011-03)
    With the proliferation of mobile wireless devices such as smartphones and tablets that are used in a wide range of locations and movement conditions, it has become important for wireless protocols to adapt to different ...
  • LaCurts, Katrina Leigh; Balakrishnan, Hari (Association for Computing Machinery, 2010-11)
    Despite many years of work in wireless mesh networks built using 802.11 radios, the performance and behavior of these networks in the wild is not well-understood. This lack of understanding is due in part to the lack of ...
  • Gummadi, Ramakrishna; Balakrishnan, Hari; Seshan, Srinivasan (Institute of Electrical and Electronics Engineers, 2009-01)
    Many licensed and unlicensed frequency bands support heterogeneous wireless networks running different physical and link layer protocols. These networks ldquosharerdquo spectrum, but in an anarchic and arbitrary manner, ...
  • Wu, Eugene; Balakrishnan, Hari; Cheung, Alvin K.; Sivalingam, Lenin Ravindranth; Madden, Samuel R. (Association for Computing Machinery (ACM), 2013-07)
    Smart-phone applications ("apps") run across a wide range of environmental conditions, locations, and hardware platforms. They are often subject to an array of interactions that are hard or impossible for developers to ...
  • Winstein, Keith J.; Balakrishnan, Hari (Advanced Computing Systems Association, 2012-06)
    Mosh (mobile shell) is a remote terminal application that supports intermittent connectivity, allows roaming, and speculatively and safely echoes user keystrokes for better interactive response over high-latency paths. ...
  • Gummadi, Ramakrishna; Balakrishnan, Hari; Maniatis, Petros; Ratnasamy, Sylvia (USENIX Association, 2009-04)
    A large fraction of email spam, distributed denial-of-service (DDoS) attacks, and click-fraud on web advertisements are caused by traffic sent from compromised machines that form botnets. This paper posits that by identifying ...
  • Popa, Raluca Ada; Blumberg, Andrew J.; Balakrishnan, Hari; Li, Frank H. (Association for Computing Machinery (ACM), 2011-10)
    A significant and growing class of location-based mobile applications aggregate position data from individual devices at a server and compute aggregate statistics over these position streams. Because these devices can be ...
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