Daewoo Chung Hyunseung Choo Hee Yong Youn Seong-Moo Yoo Efficient Location Traffic Management With Multiple Virtual Layers. 787-808 2003 19 J. Inf. Sci. Eng. 5 http://www.iis.sinica.edu.tw/page/jise/2003/200309_04.html db/journals/jise/jise19.html#ChungCYY03