Profile

I am a postdoctoral research fellow at the Queen Mary Information Retrieval Group in the Department of Computer Science at Queen Mary University of London, UK.

• Ph.D. in Information & Communication Engineering, Graduate School of Information & Communication, Ajou University, Suwon, Korea, 2005
• M.S. in AI Lab, Graduate School of Information and Communication Technology, Ajou University, Suwon, Korea, 2000
• B.S. in College of Information and Communication, Ajou University, Suwon, Korea, 1998
• Research worker at Research Institute for Information and Communication, Ajou University. (2002.2~2003.8)
• Part time lecturer (Computer Programming) at College of Information and Communication, Ajou University. (2002.2~2003.8)
• Visiting researcher at the Information Retrieval Research Group under the Department of Computing Science in the University of Glasgow for research study. funded by the Korean Government's Brain Korea 21(BK21) (2003.8~2004.3)

Research Interests

• Information Retrieval
  - Concept-based Retrieval : Extracting and Constructing Concept from documents
  - Query Processing : Generating  Query Concept

• Data Mining
  - Feature Selection and Clustering
  - Incremental Clustering, Adaptive Clustering

• Ontology
  - Semi-automatic Ontology Construction
  - Ontology Management and Integration

• Artificial Intelligence
  - Knowledge Representation and Modeling
  - Human Computer Interaction

• The use of Artificial Intelligence in education

Employment & Experience

• 2005.9 ~ present     Postdoctoral Research Fellow, Queen Mary Information Retrieval Group, UK
• 2005. 6 ~ 2005.8     Part-time lecturer, Ajou University, Suwon, Republic of Korea
• 2004. 9 ~ 2005.2     Part-time lecturer, Ajou University, Suwon, Republic of Korea
• 2003. 8 ~ 2004.3     Visiting Researcher, Information Retrieval Group, Department of Computing Science, University of Glasgow, UK.
                                  (funded by the Korean Government's Brain Korea 21(BK21))
• 2002 ~ 2003.8     Researcher, Research Institute for Information and Communication, Ajou University, Suwon, Republic of Korea.
• 2000 ~ 2003.8      Part-time lecturer, Ajou University, Suwon, Republic of Korea
                               (sponsored by KIPA (Korea IT Industry Promotion Agency), Seoul, Republic of Korea)
• 1998 ~ 1999     Part-time assistant, Ajou University, Suwon, Republic of Korea

Teaching

• 2005.6 ~ 2005.8 Basic Programming - C Language, Ajou University
• 2004.9 ~ 2004.12 Computer Programming - C Language, Ajou University
• 2002.3 ~ 2003.8 Computer Programming - C Language, Ajou University
• 2000.3 ~ 2001.12 From Thinking To Programming - C Language, Ajou University
• 1999.9 ~ 1999.12 Web Programming, Ajou University
• 1998.3 ~ 1999.12 Multimedia Authoring Tools, Ajou University (Photoshop, Illustrator, Flash, Director, ToolBook)

Projects

• 2004.5 ~ 2005.2 Automatic Constructions of Intelligent Ontology and Application Development for the next generation Internet sponsored by Ministry of Science & Technology (MOST) http://www.most.go.kr/ (no. M10302000087-03J0000-04400)
• 2000.9 ~ 2001.8 Development for a Concept-based Search Engine sponsored by Next Technologies Co., Ltd. http://www.ntechs.com
• 1998.3 ~ 1999.2 Hybrid thesaurus system on a client/server environment sponsored by KOSEF(Korea Science and Engineering Foundation) http://user.chollian.net/~jaico/index.htm
• 1997.3 ~ 1998.2 Educational Programs for Ultrasonic Testing (ECONO98) sponsored by JAICO(Joong Ang Inspection Co., Ltd.) http://user.chollian.net/~jaico/index.htm

Publications

1. Chang, Y., Wang, J., & Lamas, M.(2008). Generation of Query-Biased Concepts Using Content and Structure for Query Reformulation. In Proceedings of the 13th International Conference on Applications of Natural Language to Information Systems (NLDB 2008), Lecture Notes in Computer Science, (pp.136-141). Jun 24-27 2008, London, UK
2. Chang, Y., Kim, M., & Raghavan, V.V (2006). Construction of query concepts based on feature clustering of documents, Information Retrieval, vol.9, no. 3.(pp.231 - 248) (June 2006)
3. Chang, Y., Ounis, I., & Kim, M. (2005). Query reformulation using automatically generated query concepts from a document space, Information Processing and Management (IPM) Journal, Information Processing & Management, vol. 43, no. 9. (pp.453-468). (March 2006)
4. Chang, Y., Kim, M., & Ounis, I. (2004). Construction of query concepts in a document space based on data mining techniques. In Proceedings of the 6th International Conference On Flexible Query Answering Systems (FQAS 2004), Lecture Notes in Artificial Intelligence, (pp.137-149). June 24-26 2004, Lyon, France.
5. Chang, Y., Park, G, Kim, M., & Park, S (2003) Improved Link Analysis Algorithm Using Document Feature Information. In Proceedings of the 30th Korean Information Science Society Autumn Conference (B), pp.7-9, 2003. (in Korean)
6. Chang, Y., Choi, I., Choi, J., Kim, K., & Raghavan, V.V. (2002). Conceptual Retrieval Based on Feature Clustering of Documents. In Workshop on Mathematical/Formal Methods in Information Retrieval at the 25th Annual International ACM SIGIR Conference on Research and Development in IR, (pp. 89-104). August 11-15, 2002, Tampere, Finland
7. Chang, Y., Lim, H., & Kim, M. Extraction of Concept by Latent Semantic Indexing and Clustering, In Proceedings of the 28th Korean Information Science Society Autumn Conference (B), pp. 22-24, 2001. (in Korean)
8. Chang, Y. & Kim, M. Construction of an Effective Thesaurus Working Model on a Client/Server Environment, In Proceedings of the 26th Korean Information Science Society Autumn Conference (B), pp. 157-159, 1999. (in Korean)
9. Chang, Y. Construction of effective thesaurus working model on a client/server environment, MSc Thesis, 2000, Ajou University (in Korean)

[ Korean version ]    Last Update : 15/06/2006