Recently, corrosion problems caused by quarantine disinfectant have occurred in the door panel of commercial trucks. As a way to solve this problem, a drain hole is being drilled in the door panel, and the door panel is being designed again for this purpose. Reinforcing parts such as frames or brackets for rigidity are attached to the inner and outer door panels, and spot welding is performed for assembly. X-rays and nugget diameter measurements of the welds were performed to confirm the results of performing according to various conditions for such spot welding. Through this study, it was confirmed that the pressing force had a greater effect on the welding quality than the amount of welding current.

우리나라는 1993년 포항항 VTS 센터를 시작으로 전국의 주요 항만과 연안, 내륙수로에 세계적 수준의 VTS 시스템을 구축하여 운영 중에 있다. 하지만 높은 수준의 VTS시스템을 가지고 있음에도, 국제사회에서 VTS 업무협력 및 정책 홍보 등의 활동력은 상대적으로 빈약한 편이다. 현재의 우리나라 VTS의 조직, 예산, 인력 측면의 문제점을 살펴보고 향후 국제 VTS에서 주도적 역할과 위상제고를 위한 개선점을 살펴 보았다.