Ig-hoon Lee Suekyung Lee Taehee Lee Sang-goo Lee Dongkyu Kim Jonghoon Chun Hyunja Lee Junho Shim Practical Issues for Building a Product Ontology System. 16-25 2005 conf/deec/2005 DEEC http://doi.ieeecomputersociety.org/10.1109/DEEC.2005.17 db/conf/deec/deec2005.html#LeeLLLKCL05