선박의 충돌회피동작의 전 단계로서 위험영역을 설정하고, 이 영역을 기준으로 위험영역과 안전영역을 경계지우기 위한 많은 연구가 이루어져 왔다. 본 연구는 가변 위험영역을 설정하기 위하여 시간의 함수로서 주어진 접근 파라미터 분석을 통하여 적절한 충돌회피 동작을 위 한 필요한 목적함수를 제시하는데 목적이 있다. 종래의 연구방법들이 가질 수 있는 DCPA 및 TCPA에 기반을 둔 위험영역의 설정 및 충돌회피 의 설정법이 가질 수 있는 문제점의 보완은 실 환경에 적용 가능한 충돌회피 알고리즘 개발의 토대를 이룬다. 단순한 DCPA 및 TCPA에 따른 충돌회피 동작의 판단은 주어진 항해상황에 적정하지 못 할 수 있다.

In this study, the researcher investigated the effects of water mist nozzle shape on water mist according nozzle shape angle(=30°, 45°, 60°, 75° and 90°). It was found that the water mist spray with nozzle When exit angle of water mist nozzle is =90° as result examining about spray special quality of water mist, velocity distribution was expose to maximum. And temperature distribution of target plate was looked tendency that range low. Water mist spray system that consider in this research is one of the most important utilities providing water mist in order to supply fire extinguishing.

This study presents the method of design and manufacturing of aspheric lens for flow visualization. Spherical lens is used in many fields especially flow visualization experiment. Because sperical lens has aberration by origin in flow visualization, there is case that is alternated by asperic lens. Most of asperic lens's modeling which is applied to Taylor's method. This study is designed to the aspheric lens by Euler's method, which is useful method for various geometric shape and complex experimental apparatus for flow visualization. In the present study, we have verified design and manufacturing aspheric lens through a flow visualization experiment.