My research interest centers on the Transportation Science, Location Science and Geographic Information Science (GIS) with several key research themes. Current research topics include (1) spatial optimization problems and Modeling , (2) spatial and economic analysis of transportation systems, and (3) GIS for healthcare reseach. Given these key research themes, he has built a strong research background in both geography and interdisciplinary fields by participating in various research projects at the University of Tennessee. The first research theme focuses on developing the innovative approach for spatial optimzation problems. The second research on transportation network design & analysis aims to enhance a network’s performance and its resilience to potential disruptions in the transportation systems of the United States and other countries. This line of research also focuses on the economic and environmental analysis of the transportation systems in the evolution of spatial network systems and measuring the efficiency and performance of network systems in a geographic perspective using various quantitative geo-spatial methods. Third, the third research develops the GIS models to apply for socio-economic problems in healthcare access and facility location modeling.