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Advanced Development of Social Search
Yahoo! Inc
701 First Avenue
Sunnyvale, CA 94089
zhichen@yahoo-inc.com
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Ph.D in Computer Sciences, UW-Madison
(Thesis advisors: Bart Miller and Tom
Reps)
B.S. in Computer Sciences, Fudan University
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Zhichen is technical lead of advanced development of social search at Yahoo! Inc.
His current project is My Web 2.0 ,
a social search engine. Zhichen is the main and co-inventor of much of the main
technologies underneath
My Web2.0 such as the access-control policy, and collaborative tag suggestion algorithms.
Before joining Yahoo!, he was a research scientist at Hewlett-Packard Laboratories.
He has initiated a number of projects include
Pstore,
a semantic-aware file store;
Psearch,
scalable distributed content indexing; and OASIS,
overlay for adaptive and Scalable Internet Services.
His is among the first to look into P2P information retrieval.
Zhichen holds a Ph.D. degree in Computer Sciences from UW-Madison.
His dissertation proposes techniques to perform
safety checking of machine code
without the support from the high-level
languages and compilers. These techniques can be used for
checking the safety properties of web plug-ins, dynamically
loaded OS modules, type-specific extensions to object relational
databases, and Java native methods. He has also contributed
to the parallel performance monitoring and debugging tools, Paradyn, where he proposed and
implemented techniques that can dynamically instrument
multi-threaded and distributed shared memory applications. He
has extensive experience in integrated software development
environments, and techniques to predict
the performance of parallel programs.
Zhichen has co-authored over 30 papers in the areas of social tagging, computer networks, distributed systems,
programming languages, program safety, peer-to-peer (P2P) computing, information retrieval.
Many appear in top conferences such as PLDI, SIGCOMM, SIGIR, HotOS, HotNets.
He has over 40 patent applications pending.
Zhichen is a program co-chair of AEPP'05. Zhichen has served in program committees
of ICDCS'[03,04,05,06], ISADS'05, IPTPS'04, INFOSCALE'06, ICPP'04, and NSF ITR panelist.
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Citations
and estimated
impact of conferences and journals according to Citeseer.
| SIGIR'05 workshop |
Yan Chen, Zhichen Xu, Chengxiang Zhai
. A scalable Semantic Indexing Framework for Peer-to-Peer Information Retrieval.
SIGIR 2005 workshop: Heterogeneous and Distributed Information Retrieval, August 19th, 2005 - Salvador, Brazil
2004 |
| ------ |
Zhichen Xu, Puneet Sharma, Sung-Ju Lee, Sujata Banerjee
. Landmarks Reloaded: Scalable Network Proximity Estimation Using a Landmark Hierarchy.
HPL Technical Report,
2003 |
| ICME'04 |
Bo Shen, Zhichen Xu, Susie Wee, John Apostoloulos
. Semantic-Enhanced Distribution & Adaptation Networks,
Invited paper, International Conference on Multimedia and Expo (ICME'04)
, Taipei Taiwan,
June 2004 |
| SIGIR'04 |
Chunqiang Tang, Sandhya Dwarkdas, Zhichen Xu
. On Sclaing Latent Semantic Indexing for Large Peer-to-Peer Systems.
27th Annual International ACM SIGIR Conference
, Sheffield,
UK, July 2004 |
| FTDCS'04 |
Zheng Zhang, Mallik Mahalingam, Zhichen Xu, Wenting
Tang. Scalable, Structured Data Placement over P2P Storage
Utilities. 10th International Workshop on
Future Trends in Distributed Computing Systems - FTDCS 2004, Suzhou,
China, May 26-28, 2004 |
| IEEE TPDS |
Li Xiao, Zhichen Xu, and Xiaodong Zhang, Low-Cost and
Reliable Mutual Anonymity Protocols in Peer-to-Peer Networks. Special
issue on Security Issues in Distributed Computing Systems of IEEE
Transactions on Parallel and Distributed Systems, 2003. |
| SIGCOMM'03 |
Chunqiang Tang, Zhichen Xu, and Sandhya Dwarkadas, ``Peer-to-Peer
Information Retrieval Using Self-Organizing Semantic Overlay Networks'', ACM
SIGCOMM 2003, Karlsruhe, Germany, August 2003. To appear. |
| WIAPP'03 |
Sujata Banerjee, Zhichen Xu, Sung-Ju Lee, and Chunqiang
Tang.``Service Multicast for Media Distribution
Networks'', 2003
IEEE Workshop on Internet Applications (WIAPP'03), San Jose, CA, June
2003. |
| NOSSDAV'03 |
Zhichen Xu, Chunqiang Tang, Sujata Banerjee, and Sung-Ju
Lee.``Receiver Initiated Just-in-Time Tree Adaptation for Rich Media
Distribution'', The 13th
International Workshop on Network and Operating Systems Support for
Digital Audio and Video (NOSSDAV), Monterey, California, June 2003.
Co-located with IWQoS. |
| HotOS-IX'03 |
Zhichen Xu, Magnus Karlsson, Chunqiang Tang, and Christos
Karamanolis: "Towards a Semantic-Aware File Store". 9th
Workshop on Hot Topics in Operating Systems (HotOS IX). May 18-21,
2003 |
| Infocom'03 |
Zhichen Xu, Mallik Mahalingam, and Magnus Karlsson:
"Turining
Heterogeneity into an Advantage in Overlay Routing". IEEE Infocom
2003. |
| ICDCS'03 |
Zhichen Xu, Chunqiang Tang, and Zheng Zhang: "Building
Topology-Aware Overlays using Global Soft-State". The 23rd International
Conference on Distributed Computing Systems. May 19-22, 2003
Providence, Rhode Island USA |
| ICDCS'03 |
Li Xiao, Zhichen Xu and Xiaodong Zhang: "Efficient Mutual
Anonymity Protocols for Peer-to-Peer Systems". The 23rd International
Conference on Distributed Computing Systems. May 19-22, 2003
Providence, Rhode Island USA |
| FTDCS'2003 |
Chunqiang Tang and Zhichen Xu. ``pFilter: Global
Information Filtering and Dissemination'', the
9th International Workshop on Future Trends of Distributed Computing
Systems, San Juan, Puerto Rico, May 2003. Expanded version
available as HP Technical Report HPL-2002-304 |
| FTDCS'2003 |
Mallik Mahalingam, Chunqiang Tang and Zhichen Xu. ``Towards a Semantic, Deep Archival File
System''. The
9th International Workshop on Future Trends of Distributed Computing
Systems, San Juan, Puerto Rico, May 2003. |
| HotNets-I'02 |
Chunqiang Tang, Zhichen Xu, and Mallik Mahalingam: "pSearch:
Information Retrieval in Structured Overlays". First
Workshop on Hot Topics in Networks (HotNets-I). 28-29 October 2002. Princeton, New Jersey, USA.
www.acm.org/sigcomm/HotNets-I
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| P2P2002 |
Artur Andrzejak and Zhichen Xu: "Scalable, Efficient Range Queries
for Grid Information Services". The Second IEEE International Conference
on Peer-to-Peer Computing (P2P2002), 5-7 September 2002, Linköping,
Sweden. |
| NASA Mass Storage'02 |
M. Mahalingam, C. Karamanolis, M. Karlsson, Z. Xu. "Locating Logical Volumes
in Large-Scale Networks". Tenth NASA Goddard Conference on Mass
Storage Systems and Technologies" that is held in cooperation with
the Nineteenth IEEE Symposium on Mass Storage Systems at the Inn and
Conference Center, University of Maryland University College, 3501
University Boulevard East, Adelphi, Maryland, USA, on April 15 - 18, 2002. |
| IPDPS'02 |
L. Xiao, X. Zhang and Z. Xu. "On Reliable and Scalable
Peer-to-Peer Web Document Sharing". Proceedings of 2002 International
Parallel and Distributed Processing Symposium, (IPDPS'02). |
| ESOP'01 |
Zhichen Xu, Thomas Reps, and Barton Miller, "Typestate Checking of Machine Code". 10th European
Symposium on Programming. Genova, Italy, April 2001. Lecture Notes in
Computer Science 2028, G. Goos, J. Hartmanis and J. van Leeuwen (Eds.) slides
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| PLDI'00 |
Zhichen Xu, Barton Miller and Thomas Reps, "Safety
Checking of Machine Code". SIGPLAN Conference on Programming
Language Design and Implementation. Vancouver B.C., Canada.
June 2000. slides.
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| PPoPP'99 |
Zhichen Xu, Barton Miller and Oscar Naim, "Dynamic
Instrumentation of Threaded Applications". 7th SIGPLAN Symposium on
Principles and Practice of Parallel Programming. Atlanta,
Georgia. May 1999. slides
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| PPoPP'97 |
Zhichen Xu, James Larus and Barton Miller. "Shared-Memory
Performance Profiling". 6th SIGPLAN Symposium on Principles and
Practice of Parallel Programming. Las Vegas, Nevada. June
1997. |
| FACT'97 |
Jeffrey K. Hollingsworth, Barton P. Miller, Marcelo J. R.
Goncalves, Oscar Naim, Zhichen Xu and Ling Zheng. "MDL:
A Language and Compiler for Dynamic Program Instrumentation". 1997
International Conference on Parallel Architectures and Compilation Techniques.
San Francisco, California. November 1997. |
| MASCOTS'96 |
Zhichen Xu, "Simulation
of heterogeneous networks of workstations". International Workshop
on Modeling, Analysis and Simulation of Computer and Telecommunication Systems.
San Jose, California. February 1996.
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| JPDC |
Zhichen Xu, Xiaodong Zhang and Ling Sun, "Semi-Empirical
Performance Predictions". Journal of Parallel and Distributed Computing
, 39, 1, 1996
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| ICS'95 |
Xiaodong Zhang, and Zhichen Xu, "Multiprocessor
scalability prediction through detailed program execution analysis". 9th
ACM International Conference on Supercomputing. Barcelona,
Spain. July 1995. (best paper)
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| Sigmetrics'95 |
Xiaodong Zhang and Zhichen Xu, "A
semi-empirical approach to scalability study". SIGMETRICS Conference
on Measurement and Modeling of Computer Systems. 1995. |
| SPDP'94 |
X. Zhang, Zhichen Xu and L. Sun, "Performance
predictions on implicit communication systems". IEEE Symposium of
Parallel and Distributed Processing. Dallas, Texas. October 1994.
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Ph.D. Dissertation
Zhichen Xu, "
Safety-Checking of Machine Code".
Ph.D. Dissertation, University of Wisconsin, Madison, December 2000. slides,
UC Davis talk
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