제주신항의 해상교통안전성평가에 관한 연구

김창제(Chang-Je Kim),채양범(Yang-Bum Chae),예병덕(Beyong-Duck Ye),강성진(Song-Jin Gang),김원욱(Won-Ouk Kim),정재용(Jae-Yong Jong) 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.1

80,000 G/T급 크루즈선이 입항할 수 있는 터미널을 계획하고 있는 제주신항에 대하여 자연ㆍ환경 조건 및 방파제 등의 구조물 등을 고려하여 선박조종시뮬레이션을 실시하여 입ㆍ출항 및 접ㆍ이안의 안전성을 평가하고자 한다. 안전성 평가는 항로경계의 침범여부, 구조물과의 최근접거리, 선박조종자의 주관적 평가를 통계적으로 해석하는 방법을 이용하였다. In accordance with the development plans of Jeju for international free city, Jeju new harbor will be constructed cosidering supporting Jeju city as an international tour city, safe arrival and departure at the terminal of 80,000G/T cruise ship. In this study, we used a lull-mission ship handling simulator adopting 80,000 G/T cruise ship manoeuvered at the planned Jeju international cruise terminal. Five masters who have had a long experience of ship maneuvering were called to carry out the simulations, of which No. 1, No. 2 and No. 4 scenario of simulation were tried twice, completed the total of 10 times and No. 3 scenario of simulation once, reached at the total of 5 times. The marine traffic safety was assessed in terms of 1) the closest point of approach(CPA) to breakwater and quay in the vicinity and the probability of crossing fairway limit, 2) subjective evaluation such as the mental burden and the maneuvering disfficulty of shiphanders, and 3) the opinions of shiphandlers. From the result of this simulation, we have a conclusion that the 80,000 G/T cruise ship can be maneuvered safely at the planned terminal.

분쇄형 탄소 섬유/나일론 복합재료의 전기적 성질과 전자파 차폐 효율

김창제(Chang Je Kim),최형도(Hyung Do Choi),서광석(Kwang S. Suh),윤호규(Ho Gyu Yoon) 한국고분자학회 2003 폴리머 Vol.27 No.3

파이버 레이저의 스테인리스강 용접시 인프로세스 모니터링을 위한 유기 플라즈마와 방사신호간의 상관성 연구(II) - 후판 용접시 측정신호의 특성 변화 -

이창제,김종도,Lee, Chang-Je,Kim, Jong-Do 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.6

On this study, we researched the in-process monitoring during fiber laser welding as well as on the first paper. On the previous/formal study, we analyzed the change of emission signal on thin plate welding. On this study, however, we analyzed RMS and FFT with emission signals in laser welding on lap joint and butt joint of 8mm-thick 316L stainless steel. As the result, the movement of specific frequency peak was observed according to welding speed changes. Furthermore, frequency peak as a result of FFT on the thick plate welding are much clearer than on the thin plate welding. Therefore, it is expected that the welding parameter changes can be predicted in case of applying FFT to in-process monitoring.

소형어선의 인적과실 방지에 관한 연구

김영롱(Young-Rong KIM),강성진(Song-Jin KANG),김원욱(Won-Ouk KIM),김창제(Chang-Je KIM) 한국수산해양교육학회 2019 水産海洋敎育硏究 Vol.31 No.6

항해 안전관련 시설 원격 감시 및 제어모듈의 개발에 관한 연구

김창제(Chang-Je Kim),송재욱(Jae-Uk Song),김철호(Chul-Ho Kim) 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.3

본 연구에서는, 모든 유ㆍ무인등대와 등ㆍ부표를 원격으로 감시하고 제어하기 위한 항로표지 집약관리센터를 구축하기 위한 기반여건 조성작업의 일환으로써, 장비 및 그 지리적인 특수성 때문에 유지ㆍ관리에 있어서 기술적 경제적 어려움이 많은 무인 항해 안전관련 시설에 대하여, 상태 확인 및 관리ㆍ제어는 물론, 정비시기의 예측 등 장비의 운영상태를 최고의 상태로 유지할 수 있도록 하는 모듈의 개발에 관하여 논하였으며, 본 연구에서 개발한 모듈을 활용한다면 보다 과학적이고 효율적인 항로표지의 설치, 관리, 운영 및 유지ㆍ보수가 가능할 것이다. Is is said to be very difficult to maintain the aids to maintain the aids to navigation such as buoys and lighthouses due to their geographical characteristics. This paper, as a part task of the construction of aids to navigation control center, describes the method to make the module for remote-controlling lighthouses and buoys. We become to be able not only to get informations such as the conditions of lights and batteries, but also to control remotely the aids to navigation by using microwaves so as to maintain them in good condition.

당항만의 해수유동에 관한 연구

김창제(Chang-Je Kim),김미금(Mi-Kum Kim),손창배(Chang-bae Son),강성진(Sung-Jin Kang) 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.2

만의 일부만이 개방되어 있고 어선이나 군함 등의 선박통항이 빈번한 당항만을 대상 해역으로 하여 폐쇄성 연안해역의 해수유동에 관해 고찰하였다. Recently, the water pollution of coastal sea area including harbor, bay and inland sea has been very serious and it causes various environmental impacts. In this study, water flow system of Donghang Bay, which has the narrow and long topographical characteristics with the narrow bay mouth and its flow is influenced principally by the tidal current, is investigated experimentally and numerically. In order to understand the tidal system of Danghang Bay, harmonic analysis is performed based on measured tidal range and flow velocity. In addition, numerical model for tidal exchange is developed considering conditions of Danghang Bay. Calculated results show good agreement with measurement. Lastly, based on the proposed numerical model, exchange ratio of seawater volume in Danghang Bay is predicted.

선박조종 시뮬레이터를 이용한 해사교육 및 훈련

김창제(Chang-Je Kim) 한국시뮬레이션학회 2002 한국시뮬레이션학회 논문지 Vol.11 No.4

Several full mission simulators have been installed since about 10 years ago in Korea. The newly estabHshed Marine Simulation Training and Research Center at Korea Maritime University has played a key role for education and training of both cadets and in-service officers trainees, and for research on Korea ports such as Jeju international cruise port, Ulsan SBM and Kwangyang container port and many others. This study mainly focuses maritime education and training on the ship handling simulation and the bridge resource management conducted by Korea Maritime University.

API강재의 파이버레이저 용접시 유기하는 플라즈마의 방사특성 (III) - 보호가스가 플라즈마 방사 신호에 미치는 영향 -

이창제,김종도,김유찬,Lee, Chang-Je,Kim, Jong-Do,Kim, Yu-Chan 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.3

Ar, $N_2$, and He are the conventional kind of shield gas that are used for laser welding. Many researches on the impact of laser welding shield gas have been done, and it is on going until now. However, there are few studies that analyze the changes and differences of the plasma emission signal. Therefore, in this study, we evaluated the change in the penetration characteristics according to the type of shield gas during fiber laser welding impacts to the plasma signal. As a result, if was checked that the difference in molecular weight of Ar, $N_2$, and He affects to the amount of spatter, and also found that the measured plasma radiation signal changes similar to the order of the molecular weight of the gases. Especially, clear change on the signal intensity per each shield gas was measured through RMS, and found that the shield gas was nothing to do with the FFT analyzed result.

연안역에서의 취송류의 3차원 확산특성

마현호(Hyun-Ho Ma),김창제(Chang-Je Kim) 한국해양대학교 해사산업연구소 2000 海事産業硏究所論文集 Vol.10 No.-

연안부근의 흐름을 지배하는 요인으로서는 조석에 의한 조류와 바람에 의한 취송류로 크게 분류할 수 있다. 조석 등과 같이 주기가 긴 장파에 의한 연안해역에서의 흐름은, 연안해역의 수평스케일이 연직스케일에 비해 상당히 크기 때문에 연직방향으로 수심 평균한 평면 2차원 흐름으로 평가한다. 그러나, 취송류의 경우, 수심방향의 유속분포는 수면에서 최대이며 수심이 깊어짐에 따라 대수적으로 감소(加藤始 等, 1976; Bains, etal., 1965)하며, 풍속, 풍향, 수심, 지형, 바람의 지속시간 둥 그 기구가 복잡하여 연안과 같이 수심과 지형이 크게 변하는 곳에서는 기존의 방법으로 오염물질 확산거리를 해석하면 현상을 과소평가할 가능성이 있으며, 확산방향도 연안해역의 지형적 복잡성 때문에 잘못 평가할 가능성이 있다. 특히 기름과 같은 부유성 오염물질의 이동을 해석하는 경우, 수심방향으로 평균한 평면 2차원흐름으로 해석하면 현상을 과소평가할 가능성이 있다. 이에 본 연구에서는 취송류를 지배하는 풍속, 풍향, 수심, 지형 등을 고려하여 연안해역에 적용할 수 있는 취송류의 3차원 모델을 제시하였다. The analysis of the movement of tidal current has been carried out with an assumption that tidal current is to be a 2-D plane flow in the averaged depth. Insofar as wind-induced flows, however, 3-D analysis has to be applied since wind-induced flows shows the characteristics of logarithmic velocity profile from the water surface to the bottom. The Vertical distribution of wind-induced flows mostly depends upon the vertical eddy viscosity. For this reason, Ekman's calculation does not have inertia and horizontal viscosity terms. This method of calculation has formed a basis in the study of this field. Application of this model to a region where changes of water depth and geographical features are not prominent does not hinder a higher accuracy. However, a problem of a certain degree may arise if we apply this model to a region where the changes of water depth and geography are prominent such as nearshore zones, for the inertia and horizontal viscosity terms in equation of motion are not included in the Ekman's model. Therefore, this study has aimed at quantifying the equation of motion with particular attention to the inertia and horizontal viscosity terms in question and, further, proposing a 3-D model which is capable of being applied to nearshore zones. In order to verify the 3-D characteristics of wind-induced flows due to geographical changes, a model test was performed in the wind flume, as shown in Fig. 4. and Fig. 5. The applicability of the proposed model to the Port of Ulsan was confirmed with the following results: 1. The experiment gives good results in comparison with the numerical analysis, when a structure is placed. The surface flow over the boundary of the structure is found an inverse flow against the surface. Therefore, the proposed model can be used even in the region where a structure is placed or changes of geographical changes are prominent. 2. When the proposed model was applied to the Port of Ulsan where the gradient of water depth was relatively high, it was found that the Vertical distribution of the flow exhibits the characteristics of an inverse flow.

연안역 해저구조물의 안전에 관한 연구

김동수(Dong-Su Kim),김창제(Chang-Je Kim) 한국해양대학교 해사산업연구소 2000 海事産業硏究所論文集 Vol.10 No.-

연안해역에 산업시설 및 생활기반시설이 집중됨에 따라 연안해역에는 선박교통량이 폭주하게 되었으며, 또한 송수관, 송유관, 가스파이프 라인 및 케이블 등 해저구조물의 건설이 증가하게 되었다. 해저침식에 의한 구조물의 노출, 닻의 투하에 의한 구조물의 충격 등 해저구조물이 손상을 받으면 막대한 인명 및 재산피해를 초래할 수가 있다. 따라서 이 연구는 조류에 의한 해저의 침식, 닻에 의한 해저충격력, 닻의 파주깊이를 현장자료 등에 기초하여 해저구조물의 안전성을 평가한 것이다. In coastal area, there are various flows such as tidal currents, wind-induced currents, nearshore currents and so on, and also there is heavy traffic due to the numerous sailing vessels. The flows in coastal area bring in topographical changes through the accumulation/erosion on the sea bed. Topographical changes on the sea bed affect the safety of vessels and sea bed structures because those make change of water depth and buried depth. Buried depth is one of major factors to define the striking force of anchor to sea bed structure. When ship's anchor is dropped to the sea bed, the anchor strikes the sea bed and penetrates sea bed to the certain depth. In this case, sometimes structures on/under the sea bed may be damaged by strike or touch of anchor. This study presents the qualitative method to predict the topographical changes by flows, and some approximate equations which calculate the striking force and the penetrating depth of anchor. This method and equations are applied to the Inchon bay to evaluate the safety of gas pipe buried in sea bed. In results of the study, the sea bed gas pipe is safe from strike and penetrating depth of anchor, but continuous observation and caution is required because the erosion occurs in some places around the buried gas pipe. The results of this study are expected to be used as the design parameters of sea bed structures.