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  2. <title>Arvind's Home Page</title>
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  4. <h1>Arvind Thiagarajan</h1>
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  5. <img src="photos/masswinter/febsnow/misc1%20008.jpg" width=240 height=180><br><br>
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  6. 

  7. <p>I'm a PhD student in <a href="http://www.csail.mit.edu">MIT
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  8. CSAIL</a>, working with Professor <a href="http://nms.lcs.mit.edu/~hari">Hari
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  9. Balakrishnan</a> and Professor <a href="http://db.lcs.mit.edu/madden">Sam
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  10. Madden</a>.<br> 
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  11. 

  12. <p>I graduated from <a href="http://www.iitm.ac.in">IIT Madras</a> in July 2005
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  13. with a B.Tech in Computer Science, and received my Masters from MIT in
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  14. September 2007. My research interests are in large-scale sensor systems, with a particular
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  15. interest in applying machine learning techniques to real-world collaborative sensing problems.
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  16. </p>
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  17. 

  18. <h3>Research</h3>
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  19. 

  20. <p>I am currently working on the exciting problem of <i>crowdsourcing
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  21. traffic</i>. The problem is to estimate and predict future road traffic
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  22. conditions from location data gathered from people's mobile phones in real-time
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  23. as they drive around a city.  Specifically, I am looking at two research
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  24. questions: how to obtain accurate travel time estimates from noisy WiFi and
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  25. cellular location data, which is much cheaper energy-wise than GPS but much
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  26. less accurate; and how to use machine learning to predict <i>future</i> traffic
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  27. conditions by looking at historical data, and spatio-temporal
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  28. correlations (for example, correlations between traffic conditions on adjacent
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  29. roads at a major intersection). This work is part of the <a
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  30. href="http://cartel.csail.mit.edu">Cartel</a> project.</p>
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  31. 

  32. <p>A related fun collaborative sensing project I am involved with is <a
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  33. href="http://www.transitgenie.com/">Transitgenie</a>, a real-time,
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  34. context-aware system for public transit (bus and train) navigation. I
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  35. have worked on an intelligent route matching system for <i>collaborative 
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  36. transit tracking</i>, where mobile phone users traveling on buses
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  37. and trains can contribute real-time tracking data to significantly
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  38. reduce wait times and hassle for their fellow public transport commuters.
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  39. This work will appear in Sensys 2010.
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  40. 

  41. <p>Previously, I have worked on <a href="functiondb.pdf">FunctionDB</a>, a
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  42. relational database system that allows users to query mathematical functions as
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  43. first-class citizens. This is a useful abstraction for many applications, such
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  44. as sensor networks, which need to deal with noisy, error-prone and potentially
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  45. incomplete data which is a continuous function of time or space. This is in
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  46. contrast to traditional relational data, which typically consists of discrete
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  47. rows or tuples. This is a logical extension of the <a
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  48. href="http://www.cs.umd.edu/~amol/MauveDB">MauveDB</a> project.</p>
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  49. 

  50. <p>I have also worked on <a
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  51. href="http://wavescope.csail.mit.edu">Wavescope</a>, a platform for high data
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  52. rate sensor computing and streaming applications and helped build XStream, a
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  53. high data-rate signal processing system which is part of Wavescope.</p>
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  54. 

  55. <p>I have also worked on systems research projects during my summer internships
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  56. at Yahoo! Research (Summer 2008) and Google (Summer 2007). More details
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  57. forthcoming.</p>
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  58. 

  59. <h3>Papers</h3>
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  60. 

  61. <ul>
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  63. <li>
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  64. <a href="http://db.csail.mit.edu/pubs/ctrack-cr.pdf"><b>Accurate, Low-Energy Trajectory Mapping For Mobile Devices</b></a><br><a href="http://nms.csail.mit.edu/~arvindt">Arvind Thiagarajan</a>, <a href="http://people.csail.mit.edu/lenin/">Lenin Ravindranath</a>, <a href="http://nms.csail.mit.edu/~hari">Hari Balakrishnan</a>, <a href="http://db.csail.mit.edu/madden/">Samuel Madden</a>, <a href="http://nms.csail.mit.edu/~girod">Lewis Girod</a></br>
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  65. 

  66. <a href="http://www.usenix.org/events/nsdi11/">NSDI 2011</a>, Boston, USA, April 2011. <i><font color="red">To appear</font></i>.
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  68. <br><br>
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  70. <li>
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  71. <a href="coop-camera-ready.pdf"><b>Cooperative Transit Tracking Using GPS-enabled Smart-phones</b></a><br><a href="http://nms.csail.mit.edu/~arvindt">Arvind Thiagarajan</a>, <a href="http://www.cs.uic.edu/~jbiagion/">James P. Biagioni</a>, Tomas Gerlich, <a href="http://www.cs.uic.edu/~jakob">Jakob Eriksson</a></br>
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  72. 

  73. <a href="http://sensys.acm.org/2010/">Sensys 2010</a>, Zurich, Switzerland, Nov 2010.
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  74. 

  75. <br><br>
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  76. 

  77. <li>
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  78. <a href="vtrack-cr-submission.pdf"><b>VTrack: Accurate, Energy-Aware Road Traffic Delay Estimation Using Mobile Phones</b></a><br><a href="http://nms.csail.mit.edu/~arvindt">Arvind Thiagarajan</a>, <a href=http://people.csail.mit.edu/lenin/>Lenin Ravindranath</a>, <a href="http://people.csail.mit.edu/katrina/">Katrina LaCurts</a>, <a href="http://www.tau.ac.il/~stoledo/">Sivan Toledo</a>, <a href="http://www.cs.uic.edu/~jakob">Jakob Eriksson</a>, <a href="http://db.csail.mit.edu/madden/">Samuel Madden</a>, <a href="http://nms.csail.mit.edu/~hari">Hari Balakrishnan</a></br>
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  79. 

  80. <a href="http://sensys.acm.org/2009/">Sensys 2009</a>. Berkeley, California, Nov 2009 (<i><b>Best Paper Award</b></i>).
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  81. 

  82. <br><br>
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  83. 

  84. <li>
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  85. 

  86. <a href="functiondb.pdf"><b>Querying Continuous Functions in a Database System</b></a><br><a href="http://nms.csail.mit.edu/~arvindt">Arvind Thiagarajan</a>, <a href=http://db.csail.mit.edu/madden>Samuel Madden</a></br>
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  88. <a href="http://www.sigmod08.org/">SIGMOD 2008</a>. Vancouver, BC, Canada, June 2008.
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  89. 

  90. <br><br>
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  91. 

  92. <li>
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  93. <a href="http://db.csail.mit.edu/pubs/icde08.pdf"><b>XStream: A Signal-Oriented Data Stream Management System</b></a><br><a href=http://nms.csail.mit.edu/~girod/>Lewis Girod</a>, Yuan Mei, Ryan Newton, <a href="http://www.mit.edu/~stanrost/">Stanislav Rost</a>, <a href="http://nms.csail.mit.edu/~arvindt/">Arvind Thiagarajan</a>, <a href=http://nms.lcs.mit.edu/~hari>Hari Balakrishnan</a>, <a href=http://db.lcs.mit.edu/madden>Samuel Madden</a><br>
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  94. 

  95. <a href="http://www.icde2008.org/">ICDE 2008</a>. Cancun, Mexico, April 2008.
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  97. <br><br>
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  99. <li>
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  100. <a href="http://db.csail.mit.edu/pubs/cidr07.pdf"><b>The Case for a Signal-Oriented Data Stream Management System</b></a><br><a href=http://nms.csail.mit.edu/~girod/>Lewis Girod</a>, Yuan Mei, Ryan Newton, <a href="http://www.mit.edu/~stanrost/">Stanislav Rost</a>, <a href="http://nms.csail.mit.edu/~arvindt/">Arvind Thiagarajan</a>, <a href=http://nms.lcs.mit.edu/~hari>Hari Balakrishnan</a>, <a href=http://db.lcs.mit.edu/madden>Samuel Madden</a><br>
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  101. 

  102. <a href="http://www-db.cs.wisc.edu/cidr/cidr2007/index.html">CIDR 2007</a>. Asilomar, CA, January 2007.<p></li>
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  104. </ul>
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  105. 

  106. <h3>Other Interests</h3>
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  107. 

  108. <p>I am an avid follower, <i>rasika</i> and beginning student of Carnatic
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  109. Music, the classical music of South India, an amazingly rich and diverse art
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  110. form. Here's a <a href="http://www.narada.org/ariyakudi/">web page</a> devoted
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  111. to the late Shri Ariyakudi Ramanuja Iyengar, one of my all-time favourite musicians in this
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  112. style.</p>
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  113. 

  114. <p>I am also interested in speaking Samskritam (Sanskrit), one of the oldest
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  115. and richest languages of India and the world. We have a student group, <a
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  116. href="http://web.mit.edu/samskritam/www">MIT Samskritam</a> dedicated to
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  117. promoting and speaking this wonderful language, and we meet weekly on
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  118. Wednesdays for spoken Sanskrit classes. I currently help teach the
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  119. beginner class for this group.</p>
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  120. 

  121. <p> I've started dabbling with photography a little; check out my
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  122. flickr photostream <a href="http://flickr.com/photos/arvindt">here</a>.
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  123. Pics taken using a Nikon D40.</p>
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  124. 

  125. <h3>Classes</h3>
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  126. <ul>
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  127. <li>Teaching Assistant for 6.830: Database Systems (Fall 2007)</li>
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  128. <li>6.863: Natural Language Processing (Spring 2007)</li>
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  129. <li><a href="http://cag.csail.mit.edu/ps3">6.189: Multicore Programming</a> (IAP 2007)</li>
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  130. <li><a href="http://db.csail.mit.edu/6.830">6.830: Database Systems</a> (Fall 2006)</li>
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  131. <li><a href="http://courses.csail.mit.edu/6.854/06">6.854: Advanced Algorithms</a> (Fall 2006)</li>
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  132. <li><a href="http://pdos.csail.mit.edu/6.824">6.824: Distributed Systems</a> (Spring 2006)</li>
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  133. <li><a href="http://courses.csail.mit.edu/6.867">6.867: Machine Learning</a> (Fall 2005)</li>
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  134. <li><a href="http://nms.csail.mit.edu/6.829">6.829: Computer Networks</a> (Fall 2005)</li>
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  135. </ul>
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  136.