|
|
Zhifei Li |
|
Ph.D. Student |
|
|
|
|
|
Office: CSEB 322 |
|
|
Email: zhifei.work@gmail.com |
Research Interests
Natural Language Processing (current focus)
I am interested in applying machine learning methods (mainly sequence/structured model) on large-scale NLP applications such as Machine Translation and Language Modeling. Due to the large scale of the training data and the model search space, compact data structures (for model representation) and efficient algorithms (for model inference and learning) are essential. Also, due to the complex dependency among the model parameters, a discriminative feature-based framework is more flexible than a generative model. Currently, I am working on large-scale discriminative training for machine translation system (e.g., translation between Chinese and English).
Networking and
Distributed Systems
I am also interested in system-oriented research on computer networks. Before coming to JHU, I have done some work in wireless networks. In particular, during 1999-2002, I have worked at MobileSoft for several commercial projects related to WAP and Bluetooth. During 2002-2004 at NTU, I have worked on Medium Access Control issues in IEEE 802.11-based wireless networks. Here are some of my publications in this area.
Applied Algorithms
I was also very interested in applying algorithmic/theoretical methods in some fascinating applications. I found the following theoretical areas, Distributed Algorithms, Game Theory, Graph Algorithms, and Online Algorithms, are of great interests. The application problems that I was interested in are Wireless Networks, P2P, Web Search Ranking, and Reputation Systems.
Publications (on Natural Language Processing):
Machine Translation:
Zhifei Li and David Yarowsky. Unsupervised
Translation Induction for Chinese Abbreviations using Monolingual Corpora. Proceedings of ACL-08, to appear.
Zhifei Li and Sanjeev
Khudanpur. A Scalable Decoder for Parsing-based Machine Translation with
Equivalent Language Model State Maintenance.
Proceedings of ACL SSST 2008, to appear.
Software: download
Spoken Dialogue Management:
Zhifei Li, Patrick Nguyen, and Geoffrey
Zweig. Optimal
Dialog in Consumer-Rating Systems using a POMDP Framework. To appear in ACL SIGdial 2008.
Publications (on wireless networking)
Teaching (TA)
Introduction to Algorithms (Fall of 2005, Prof. Baruch
Awerbuch)
Computer
Networks Fundamentals (Spring of 2005 and 2006, Prof. Gerald M. Masson)
Computer
Organization Fundamentals (Fall of 2004, Prof. Gerald
M. Masson)