- Large-scale production of secondary metabolites through bioreactor culture
- Mass propagation of horticultural plants through bioreactor culture
- Production of high quality transplants using hydroponic culture techniques
- Mophological, physiological, and biochemical responses of in vitro produced plants during acclimatization

1982~present Professor of Dept. of Horticulture, Chungbuk National University
1985~1986 Post Doctor fellow in Dept. of Biology, Calgary University
1988~1999 Dean of the Dept. of Horticulture, Chungbuk National University
1996~present Director of Research Center for the Development of Advanced Horticultural Technology
1997~1999 Member of an expert committee, Agricultural R&D Promotion Center, Ministry of Agriculture and Forestry
1999~present Honorary professor at the Institute of Medicinal Plants, Peking Medical College, China
2001~present Vice president, Korean Society of Medicinal Plants
2002~present Member of an expert committee, Research and Development of Agriculture
2002 Chairperson of an invitation for the 9th Asia-Pacific Orchid Conference
2003 President, Korean Society of Plant Biotechnology