I'm a Ph.D. student in the department of Computer Science at Iowa State University.
My advisor is Prof. Carl K. Chang. I joined ISU at Fall 2006. Curriculum Vitae

My core research area is Software Engineering, focusing on Automated Test input Generation for object-oriented programs, Adaptive Random Testing, Model-based random Testing, and Mining Software Repository. I am working on identifying faults in program development or in deployed programs by generating test cases, mining software repositories and analyzing software.

H. Jaygarl, S. Kim, and C.K. Chang, "Practical Extensions of a Randomized Testing Tool, " by the 33nd Annual IEEE International Computer Software and Applications Conference (COMPSAC 2009) (more)

H. Jiang, T. Nguyen, I. Chen, H. Jaygarl and C.K. Chang, "Incremental Latent Semantic Indexing for Effective, Automatic Traceability Link Evolution Management," the 23rd IEEE/ACM International Conference on Automated Software Engineering(ASE 2008) (more)

H. Jaygarl, K. Oyama, J. Xia, and C.K. Chang, "HESA: a Human-centric Evolvable Situation-Awareness Model in Smart Homes," the 2008 International Conference on Smart homes and health Telematics (ICOST 2008) (more)

K. Oyama, H. Jaygarl, J.Xia, C.K. Chang, A. Takeuchi, and H. Fujimoto, "A Human-machine Dimensional Inference Ontology that Weaves Human Intentions and Requirements of Context Awareness Systems," the 32nd Annual IEEE International Computer Software and Applications Conference (COMPSAC 2008)

I. Chen, C. Yang, T. Lu, and H. Jaygarl, "Implicit Social Network Model for Predicting and Tracking the Location of Faults," the 32nd Annual IEEE International Computer Software and Applications Conference (COMPSAC 2008) (more)

K. Oyama, H. Jaygarl, J.Xia, C.K. Chang, A. Takeuchi, and H. Fujimoto, "Requirements Analysis Using Feedback from Context Awareness Systems," Accepted by the 2nd IEEE International Workshop on Requirements Engineering For Services(REFS'08).

I. Chen, H. Jaygarl, C. Yang, P. Wu, "Information Retrieval on Bug Locations by Learning Co-located Bug Report Clusters," Accepted by the 31st Annual International ACM SIGIR Conference (SIGIR2008-Poster)

• Student Volunteer Aug. 2008
  COMPSAC 2008, the 32nd Annual IEEE International Computer Software and Applications Conference, Turku, Finland
• Student Volunteer Jul. 2008
  ICOST 2008, the 2008 International Conference on Smart homes and health Telematics, Iowa State University
• Teaching Assistant Jan. 2008 ~ Aug. 2008
  Designing Course CS107/CS108 (Applied Computer Programming I & II)
• Teaching Assistant Aug. 2007 ~ Jan. 2007
  Supporting Smart Home Laboratory in Computer Science Department of Iowa State University
• Research Assistant May. 2007 ~ Aug. 2007
  Summer Research Assistant for Prof. Tien Nguyen, Iowa State University
• Student Volunteer Aug. 2007
  useR! 2007, the R user International Statistic Conference, Iowa State University
• Teaching Assistant Jan. 2007 ~ May. 2007
  Supporting Smart Home Laboratory in Computer Science Department of Iowa State University

Eight years of experience as a software engineer and programmer working in a variety of areas in the IT field, including embedded system programming, Network programming, Windows Applications, the Internet and Web and System Integrated programming. I was working as an engineer at Samsung Electronics R&D Lab. I was developing new products with advanced future technology such as a RFID refrigerator, a new UI refrigerator and washing machine, and developing system-software for Digital Appliance products such as Operating Systems, Device Drivers, Firmware, User Interfaces and Applications in Embedded System Engineering Area.


- Working Company Summary

Samsung Electronics Co.LTD Aug. 2003 ~ Jul, 2006 Suwon, Korea
(R&D Center of Digital Appliance Network Business)

EleArt Co.LTD Jul. 1998 ~ Feb. 2002 Seoul, Korea

Freelance programmer Mar.2002 ~ Jul. 2003 Seoul, Korea

Samsung Software Membership Nov 2000 ~ Jul. 2003 Seoul, Korea

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