 Contact |
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Department of Computer Science and Engineering / Campus Box 1045
Washington University in St. Louis
One Brookings Drive, St. Louis MO 63130-4899.
Phone: (314) 935-7529
rama@cse.wustl.edu
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Resume/CV |
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Latest stuff |
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Reed-Solomon codec
Recently I wrote this Reed-Solomon codec.
A small test program to run it is also available.
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Research |
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Areas
- Data dissemination
- Distributed systems and algorithms
- Coding and Information Theory
Current Work
- Storage
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My work on storage focuses on the use of erasure codes in
fault-tolerant distributed storage. More information on my
work in this area can be found in my list of publications
and preprints.
- Data dissemination
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I have worked on schemes for efficient content distribution
and media streaming.
My current focus is on video-on-demand over wide-area
networks. My master's thesis
describes the design and implementation of a scalable
video-on-demand scheme over the Internet. This technique,
which we call Fuzzycast , uses efficient network
supported broadcast mechanisms (e.g., IP multicast) to
simultaneously satisfy multiple requests for the same data.
Fuzzycast relies on a patented
periodic broadcast mechanism and uses the least server
bandwidth of all known periodic broadcast
video-on-demand schemes, while also being very simple to
build and deploy.
Projects
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Documents |
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Conference/Workshop papers
- Marcos Aguilera, Ramaprabhu Janakiraman and Lihao Xu:
On the Erasure Recoverability of MDS Codes under Concurrent Updates,
(to appear) in Proceedings of the 2005 International Conference on Information Theory (IEEE ISIT 2005),
Adelaide, Australia, September 2005.
- Marcos Aguilera, Ramaprabhu Janakiraman and Lihao Xu:
Using Erasure Codes Efficiently for Storage in a Distributed System,
(to appear) in Proceedings of the 2005 International Conference on Dependable Systems and Networks (DSN 2005), Yokohama, Japan, June-July 2005.
- Cheng Huang, Ramaprabhu Janakiraman and Lihao Xu:
Loss-Resilient On-demand Media Streaming using Priority Encoding,
in Proceedings of the 12th Annual ACM
International Conference on Multimedia (ACM Multimedia 2004),
New York, NY, October 2004.
- Ramaprabhu Janakiraman and Lihao Xu:
Layered Priority Encoded Transmission for Video Streaming to Heterogeneous Receivers,
in Proceedings of the 2004 IEEE International Symposium on Information Theory (IEEE ISIT 2004),
Chicago, IL, July 2004.
- Ramaprabhu Janakiraman and Lihao Xu:
Efficient and Flexible Parallel Retrieval using Priority
Encoded Transmission,
in Proceedings of the 14th ACM International Workshop on Network and Operating Systems Support for Digital Audio and Video (ACM NOSSDAV 2004), Kinsale, Ireland, June 2004.
- Ramaprabhu Janakiraman and Lihao Xu:
Scalable and Efficient Multirate Data Distribution,
in Proceedings of the 2003 IEEE International Symposium on Information Theory (IEEE ISIT 2003),
Yokohama, Japan, July 2003.
- Ramaprabhu Janakiraman, Marcel Waldvogel, Qi Zhang:
Indra: A peer-to-peer approach to network intrusion detection and prevention, in Proceedings of the 2003 IEEE WET ICE Workshop on Enterprise Security, Linz, Austria, June 2003 (Best paper award.)
- Marcel Waldvogel, Wei Deng, and Ramaprabhu Janakiraman:
Efficient Buffer Management for Scalable Media-on-Demand,
in Proceedings of the 2003 SPIE Conference on Multimedia Computing and Networking (MMCN 2003), Santa Clara, CA, USA, January 2003.
- Ramaprabhu Janakiraman, Marcel Waldvogel and Lihao Xu:
Fuzzycast: Efficient Video-on-demand over Multicast,
in Proceedings of the 21st Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE INFOCOM 2002), New York, NY, USA, June 2002.
- Marcel Waldvogel and Ramaprabhu Janakiraman:
Efficient media-on-demand over multiple multicast groups,
in Proceedings of the Sixth Global Internet Symposium (in conjunction with IEEE GLOBECOM 2001), San Antonio, TX, November 2001.
Technical Reports and Theses
- Marcos Aguilera, Ramaprabhu Janakiraman and Lihao Xu:
Efficient Fault-tolerant Distributed Storage using Erasure Codes,
Technical Report 2004.
- Ramaprabhu Janakiraman, Marcel Waldvogel, Wei Deng and Lihao Xu:
Achieving Scalable and Efficient Video-on-demand over Multicast,
Technical Report 2002.
- Ramaprabhu Janakiraman:
Fuzzycast: Design and Implementation of a Scalable Media-on-Demand System, Master's thesis, Department of Computer Science, Washington University, St. Louis, MO, USA, December 2002.
- Marcos Aguilera, Ramaprabhu Janakiraman and Lihao Xu
Reliable and Secure Distributed Storage using Erasure Codes,
Technical Report 2003.
- Marcel Waldvogel, Ramaprabhu Janakiraman and Wei Deng:
Media broadcasting for multiple asynchronous receivers, Washington University Technical report #WUCS-01-02
Presentation Slides
- Efficient Buffer Management for Scalable Media-on-Demand,
MMCN 2003, Santa Clara, CA, USA, Jan. 2003
- The Multirate Data Distribution Problem,
IBM Zurich Research Laboratory, Rüschlikon, Switzerland, Nov. 2002
- Efficient media-on-demand over
multiple multicast groups, GLOBECOM 2001, San Antonio, Texas, Nov. 2001
- Fuzzycast: Design and implementation
of a scalable media-on-demand system, Masters' thesis defence
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Trivia |
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