Haifeng(Kevin) Zhao Ph.D Student Department of Computer Science University of California, Davis Davis, CA 95616 Lab: 2101 Watershed #23 Email: hfzhao 'a t' ucdavis 'd o t' edu

I am a doctoral student at Computer Science Department of University of California, Davis. I belong to the Davis Social Link (DSL) . My advisor are Professor S. Felix Wu and Professor Henric Johnson.

Resume, Oct. 2011 (PDF).

I am going to graduate in 2012

Education

• Ph.D Student, Computer Science, University of California, Davis. (2008-Present)
• M.S.,Computer Science, Peking University, Beijing, China. Advisor: Wenhua Jia (Received in Jul. 2008)
• B.S., Computer Science, Peking University, Beijing, China. (Received in Jul 2005)

Research

My research focuses on OSN (Online Social Network) design and data analysis, particularly in knowledge representation, recommendation, trust and reputation system.

My research projects are listed as follows.

• Trust Wiki: [.pdf]
  • A new knowledge presentation model which leverages social contexts (social background and relationship information) and data mining techniques to present readers with personalized and trustworthy knowledge.
  • Responsible for the algorithm design, system analysis and validation.
    
• Social Wiki: [.pdf]
  • Project to prevent vandalism and accelerate reliable collaboration in wiki systems to improve content quality by incorporating social context.
  • Responsible for the system design and implementation.
  • Independently developed a Facebook application under “SocialWiki”
  • 
• Social Reader:
  • Employed Google API and our trust model to improve users’ reading and sharing experience on social media.
  • Provided more sufficient control for users to customize friend recommended news.
  • Provided trust and reputation evaluation for each user to prevent spamming.
  • Independently developed a prototype, “Social Reader”, on Facebook.
  • 
• Constrained Hierarchical agglomerative Clustering: [.pdf]
  • Constrained clustering has been widely used in data mining to enhance clustering accuracy. Hierarchical agglomerative clutstering (HAC) organizes data with different granularity. It is the nature of building and storing human knowledge. However, there is little attention paid on constrained HAC.
  • I designed and implemented a new type of ordering constraint that captures the nature of HAC algorithm
  • The experiment of ordering constraint on 20newsgroup data shows this new constraint obviously effectively improved the accuracy of HAC compared with non-constrained or instance-level-constrained HAC
• Content-based Image Retrieval System [.pdf]
  • Implemented extraction module for color, texture, and structure features.
  • Modified a fuzzy clustering method to enhance the performance of image retrieval.
  • 

Publications

1. Haifeng Zhao, William Kallander,  Tometi Gbedema, Henric Johnson,  Felix Wu. "Read What You Trust: An Open Wiki Model Enhanced by Social Context", The Third IEEE International Conference on Social Computing (Socialcom), 2011.
2. Haifeng Zhao, Shaozhi Ye, Prantik Bhattacharyya, S. Felix Wu. “SocialWiki: Bring order to wiki systems with social context”, International Conference on Social Informatics (SocInfo), 2010.
3. Henric Johnson, Niklas Lavesson, Haifeng Zhao and Shyhtsun Felix Wu. (2011) “On the Concept of Trust in Online Social Networks”, Trustworthy Internet, Springer–Verlag Italia Srl..
4. Haifeng Zhao, Zijie Qi. “Hierarchical Agglomerative Clustering with Ordering Constraints” International Conference on Knowledge Discovery and Data Mining. 2010. 
5. Jianqiao Feng, Haifeng Zhao, Wenhua Jia. “A new adaptive distance computation technique for query-by-multiple-example system”, International Conference on Signal Image Technology and Internet Based Systems (SITIS), 2008.
6. Haifeng Zhao, Wenhua Jia. “An Adaptive Fuzzy Clustering Method for Query-by-Multiple-Example Image Retrieval”, International Conference on Signal Image Technology and Internet Based Systems (SITIS), 2007.

Teaching Assistant

• ECS 15 Introduction to Computers, Winter 2009.

Internship

• Jun 2011 - Sep 2011: Remote Control with Telepresence, Google Inc..
  • Android Remote Control
    • Designed a remote control for Google TV service based on Android to improve users’ experience when watching TV
    • Developed Bluetooth communication and voice control functions
    • Implemented social feature with Google+ API to let users share TV programs, which would also be used for personalized advertisement.
    • Applied for a patent as the first patent author.
    • 
  • Cross Stream
    • Joined a programming hackathon and developed a platform leveraging Google+, Facebook and Twitter APIs to let users easily customize Google+, Facebook and Twitter streams together.
    • 
• Jun 2010 - Sep 2010: Risk Management Modeling with Link Analysis Techniques, PayPal Inc..
  • Risk Modeling with Link Analysis Techniques
    • Designed link analysis algorithms on transaction graph based on HITS algorithm, which brings a new perspective to risk modeling at Paypal.
    • Developed R, Python and Java programs (with JUNG) to process large transaction graphs with millions of nodes.
      
• Mar 2006 - Jun 2006: AMT Provision (A component of Active Management Technology), Intel China Reserch Center.
  • AMT Provision Service
    • Experimented and configured Kerberos delegation, a key process in ensuring data security between clients and servers running Windows Server 2003.
    • Wrote C# code for data transmission between hardware and software.
    • Improved user interface for IT technicians to manage corporate network and troubleshoot issues.
• Jul 2006 - Jul 2004: Package Design & Manufacture Software for printing industry, Founder Electronics Ltd.
  • Designed and implemented software functionalities for CAD and CAM in package printing industry
  • 

Reviewing Activities

• The Third IEEE International Conference on Social Computing (SocialCom 2011)

• The Eighth IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS 2011)

• The 2009 ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD 2009)

Last Updated:  Oct 25th, 2011