This study was carried out to develop a prom ising japonica rice variety resistant to brown planthopper(Bph) through marker-assisted selection(MAS) and backcross breeding methods. 'Milyang 64' which is known as resistant japonica variety to Bph used as a

Singeonmi' is a new sweetpotato variety developed from the Mokpo Experiment Station, National Honam Agricultural Experiment Station (NHAES), Rural Development Administration (RDA) in 2001, which was resistant to fusarium wilt caused by Fusarium oxysporum

Sinjami' is a new sweetpotato variety with purple flesh developed from the Mokpo Experiment Station, National Honam Agricultural Experiment Station (NHAES), Rural Development Administration (RDA) in 2001. This variety was selected from the cross between '

Korean sweetpotato, Ipomoea batatas, varieties were examined for the cross-compatibility and -incompatibility through inter-crosses among them to obtain the fundamental genetic informations for enhancing the heterosis breeding efficiency. The pollen germi

Borami' is a new sweetpotato cultivar with light purple flesh developed at the Mokpo Experiment Station, The National Honam Agricultural Experiment Station, RDA. This cultivar was selected from the cross between 'Yamakawamurasaki' and 'Shinmi' in 1994, Se

Ship manoeuvring simulator has been widely utilized for training mariners, for assessing safety, for developing harbour and port, and for designing ships. We discuss a ship manoeuvring simulator which has been newly developed by Korea Maritime University. We briefly explain the computer network system connected with each other, the interface system between computers and navigational instruments, the mathematical model of ship manoeuvring motion in harbour areas, and also ship and terrain modeling technique. Finally using the simulator an experiment of distance cognition and a real time simulation of berthing/deberthing manoeuvre carried out and the results are shown.