Dipanjan Chakraborty

I am currently working on SIP (Session Initiation Protocol) / VoIP / IM / Presence. I am currently working on Large Scale Federated and Virtualized Presence - where we view presence broadly as an infrastructure to harness real-time attributes about people, heterogeneous devices (not just online/offline status in IMs).
We introduce the concept of Presence Virtualization which we define it as the ability for a presence client to “push” the application-specific logic for deriving composite presence state, based on the presence-related attributes of individual presentities across different domains. Our project aims to develop a highly scalable virtualized and federated presence infrastructure for heterogeneous presence-based applications, across enterprises and provider domains.

Languages/Protocols: SIP, XMPP, Java

Relevant IBM Products: Websphere Application Server, Presence Server, XML Document Management Server, Data Power

Representative Publication:

A. Acharya, N. Banerjee, D. Chakraborty, K. Dasgupta, A. Misra, S. Sharma, X. Wang, C. Wright, Programmable Presence Virtualization for Next-Generation Context-based Applications, In Proc. 7th IEEE International Conference on Pervasive Computing and Communications (PerCom), March, 2009.
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Virtual Presence Server
Co-Inventors: C. Wright, A. Acharya, A. Misra, X. Wang, K. Dasgupta, N. Banerjee

Another project I am involved in is BusinessFinder. BusinessFinder is an advanced presence-driven, location-based matchmaking framework. It incorporates real-time information of search attributes during matchmaking and provides information and the ability to establish an on-demand connection to mobile subscribers quickly, whenever and wherever needed. This enables a variety of market applications and opportunities for emerging businesses and solutions trying to exploit real-time information about people and devices.

Languages/Protocols: SIP, XMPP, Java

Relevant IBM Products: Websphere Application Server, Presence Server, Telecom Web Services Server

Representative Publication:

Dipanjan Chakraborty, Koustuv Dasgupta, Archan Misra, Efficient Querying and Resource Management Using Distributed Presence Information in Converged Networks, In Proc, 7th International Conference on Mobile Data Management (MDM), Nara, Japan, May 2006
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I have been involved in initiating research in TRiC in the area of technologies for developing regions. Our work is known as "World Wide Telecom Web" (or Spoken Web) elaborates our vision of a voice-driven ecosystem parallel to that of the WWW. It has gained significant interest in IBM since its inception. I currently work on the problem of developing a voice driven ecosystem (dubbed "Folksomaps") for community-generated intelligent maps.

Languages: OWL 1.0, Java, HTML, Ajax

Publications

Sheetal K. Agarwal, Dipanjan Chakraborty, Arun Kumar, Amit Anil Nanavati, Nitendra Rajput, HSTP: Hyperspeech Transfer Protocol, In Proc. 18th ACM Conference on Hypertext and Hypermedia (Hypertext). 2007
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Arun Kumar, Nitendra Rajput, Dipanjan Chakraborty, Sheetal K. Agarwal, Amit Anil Nanavati, WWTW: The World Wide Telecom Web. SIGCOMM Workshop on Networked Systems for Developing Regions (NSDR). 2007.

Select Patents

System and Method for Enabling Voice driven interactions among multiple IVRs, constituting a Voice Workflow
Co-Inventors: A. Kumar, A Nanavati, N. Rajput, S. K. Agarwal

A system and method to search the Telecom Web
Co-Inventors: A. Kumar, A. Nanavati, N. Rajput, S. K. Agarwal

My work in this area started in 2005 with a deep dive into massive telecom graphs and extraction of knowledge from telecom graphs. Currently, I work on online/mobile social networking, both in terms of new applications and enablers as well as mining and analyzing social network data. I am co-leading a project dubbed R-U-In (pronounced "Are you in?") that enables an activity-oriented social networking system for users to collaborate and participate in activities of mutual interest. R-U-In? understand semantics of activities and integrates with a variety of online social networks. I am currently working on various aspects of such an activity-driven social networking solution.

Languages/Protocols: Java, Web technologies (HTTP, HTML, Ajax, Javascript), Web Services, SIP, XMPP, Open Social APIs

Relevant IBM Products: IBM Telecom Web Services Server, Presence Server, Websphere Application Server

Representative Publications

Nilanjan Banerjee, Dipanjan Chakraborty, Koustuv Dasgupta, Sumit Mittal, Seema Nagar, Saguna, R-U-In? - Exploiting Rich Presence and Converged Communications for Next-generation Activity-Oriented Social Networking. In Proc. 10th International Conference on Mobile Data Management (MDM), May, 2009.
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A. Nanavati, R. Singh, D. Chakraborty, K. Dasgupta, S. Mukherjea, G. Das, S. Gurumurthy, A. Joshi, Analyzing the Structure and Evolution of Massive Telecom Graphs, IEEE Transactions on Knowledge and Data Engineering (TKDE), 2008

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A Method to Predict Churners in a Telecom Network based on Interactions and Influences
Co-Inventors: K. Dasgupta, A. Nanavati, S. Mukherjea

A System and Method to Enable Real-time Social Networking Using Converged Telecom Infrastructure
Co-Inventors: K. Dasgupta, N. Banerjee, S. Nagar, S. Mittal