Your search returned the following 3 documents:

3. Visibility-Based Pursuit-Evasion in a Polygonal Region by a Searcher
   Sang-Min Park, Jae-Ha Lee, and Kyung-Yong Chwa
   In: Proceedings of the 28th International Colloquium on Automata, Languages and Programming (ICALP-01), Crete,Greece, July,8 - July,12, 2001, 456-468
   
2. Characterization of Rooms Searchable by Two Guards
   Sang-Min Park, Jae-Ha Lee, and Kyung-Yong Chwa
   In: Proceedings of the 11th Conference on Algorithms and Computation, Taipei,Taiwan, December,18 - December,20, 2000, 515-526
   
1. Searching a polygonal room with one door by a 1-searcher
   Jae-Ha Lee, Sang-Min Park, and Kyung-Yong Chwa
   International Journal of Computational Geometry and Applications 10 (2): 201-220, 2000