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Shankar |
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Current Research Cooperative Autonomous Underwater Vehicles  Autonomous Underwater Vehicles (AUVs) provide an effective way to survey and monitor our oceans. As the capabilities of AUVs increase, they become large, heavy, expensive and complex. Our research is focussed on developing small, light and low-cost AUVs that can eventually cooperate and execute complex missions as a heterogeneous team. This research area spans multiple disciplines. More...Underwater Acoustic Communications  Acoustics provides the most obvious choice of channel to enable underwater communications, a key technology in many underwater applications. While acoustics have been used effectively for point-to-point communications in deep waters, it has had only limited success in warm shallow waters. Rapid time-varying multi-path propagation and non-gaussian noise are two main factors that limit acoustic communications in warm shallow waters. Typical networking protocols designed for electromagnetic wireless communications do not work well for underwater acoustic networks because of vast differences in latency and packet loss characteristics. In order to effectively establish communication networks in warm shallow waters, we explore several technologies for point-to-point communications. We also design and test new network protocols for underwater use. More...Undergrad Research S-Net: A Self Organizing Wireless Sensor Network  We have developed a self-organizing multi-hop wireless
sensor network system using off-the-shelf components. The sensor network is an ad-hoc, robust, scalable and self-organizing network. As the motes are
switched on, the network organizes itself to a logical tree. The network is
highly scalable: the networking stack running on the motes is capable of
dynamically adding new motes. The network responds to mote death, asymmetric
links, or link breakdown by re-organizing itself, thus ensuring low packet
losses and optimal connectivity. The hardware used is inexpensive, relatively unsophisticated,
resource-constrained, and easily available. More............. Wireless Sensor Networks: Testbed, Localization and Tracking  Set
up an experimental WSN test-bed at the Wireless Lab, Tata Institute of
Fundamental Research. The current focus is on implementation and
evaluation of contemporary localization algorithms and developing an
indoor distributed mote tracking system. Download report...Breaking The Mastermind Code  Mastermind is a two player code breaking game. Many methods to solve the code exist; and their performance depends on the parameters they are graded on. Two of the most well known methods use genetic algorithms and other heuristics. By combining these methods, I proposed a hybrid algorithm which promises a very efficient solution. The solution was published in the proceedings of National Conference on Trends and Challenges in Electronics, Communication, Information and Computer Technology. Anti Noise Headphones  Ambient noise can cause a lot of stress, especially if the exposure is prolonged. People who work at noisy sites are particulary prone to noise induced health problems. To cancel such noise, we modified a pair of headphones using an open loop active anti-noise circuit. The headphones successfully cancelled low frequency noise. The project lead to a publication in the proceedings of NCICT-07: National Conference on Information and Communication Technology. |
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