한국연안 NAVTEX서어비스를 하기 위한 방안을 제안하였다. EEX가 미정인 현실을 감안하여 서비스범위를 평화선내 전 구역으로 하였다. 해양수산부내에 운영실을 두고 , 무인으로 운영되는 동해안 송신소(죽변등대부지), 서해안 송신소(전북부안군 변산면 도청리)를 원격 감시운영하는 방안을 제안하였고, 안테나는 50m급 지선식철탑안테나이며 상부지선 일부를 정관으로 활용하고 접지선은 36본의 100m 급 래디알어어스를 제안하였다. 국문방송도 기존 시설을 겸용하여 방송하기로 하고 ITA No.2코드와 호환가능한 한글 NBDP코드를 제안하였다. 운영국 및 송신국의 시스템 구성과 장비규격, 통신회선등을 전부 제안하였다.

The test transimissionof DGPS correction data has been carried out since early 1996. The data has been sent from marine radiobeacon station at Changgi Gap Ligthouse. It was the first test brosdcast of DGPS correction data based on midium frequency of marine radiobeacon where transmission power and rate are 300W and 100bps respectively. However, there has not been any scientific study on the characteristic of the accuracy of a marine DGPS/radiobeacon. Accordingly. this paper investigates the accuracy of the system, which is currently operating in 310KHz. As a result , planned 8 reference station and coverage verified that the differential positioning accuray using themarine radiobeacon is sufficient to ensure the safetyof marine activities around the coast of Korea(position error of distance 107NM at reference station was about10m(drms)).

A fiber optic gyrocompass for ships was made in consideratino of cost, reliability and convenience. In order to reduce the cost a cheaper fiber sensor was used inthis system. The accuracy was increased by replacing a 180ppr-slit disk with a 1000ppr-encoder. The reliability was also increased by improving the signal processing electronics. This system was made as a heading angle display type for convenience. Although more inexpensive FOG than that of the previous system was used , the accuracy of this compass was increased about 0.5$^{\circ}$. Moreover, it has a very fast warm-up time of about 5minutes. Therefore, this compass can show the prospect of proactical use on ships if it is installed ona stabilizer against the dynamic motion such as rolling and pitching.

본 연구에서는 선박 자동조타시스템의 비선형 요소가 추진 에너지 손실량에 미치는 영향을 정량적으로 평가, 해석하였다. 대양을 자동조타로써 보침 항해중인 선박의 자동조타시스템은 크게 선형 및 비선형요소로 나눌 수있는데, 각 요소들중, 특히 시스템 내부에 인위적으로 또는 불가피하게 설치되어 있는 비선형요소들의 영향은 매우 크다. 본 연구에서는 오토파일럿의 비선형 제어 상수가 전체 시스템의 안정성 또는 추진 에너지 손실의 증감에 미치는 영향을 조사하였다. 본 연구의 수치계산에 이용한 선박은 소형 어선 1척과 대형 광석운반석 1척이며 평균, 풍속 10m/sec 의 대표적 해상상태의 풍·파랑 외란 조건하에서 추지 에너지 손실의 지표인 성능평가지수를 계산하였다. 그리고 수치계산 결과에 대해서도 논하였다.

스프라인 보간을 이용한 새로운 해안선 데이터 압축 방법을 제안하였다. 스프라인 보간에 적용하기 위한 노드는 항해 측면에서 현저한 해안위치로 정하였다. 그리고 , 보간은 긴 곡선 형태의 해안선에만 부분적으로 적용하였다. 여러 가지 압축률에 따른 해안선 형태의 변화애 대하여 검토하고 결과를 제시하였다.

In case of Radar Simulator ,the target ships should be generated and displayed on the monitor to provide the trainee with the feeling of real situation. The scenario methodology, which has been developed and used in Korea so far, however, has a fixed scenario, in which target ships are generated in the same manner at all time. As a result, the Radar simulator developed in Korea so far was in lack of training efficiency, as the trainee can get earily familiarized with the fixed scenaio. The paper, therefore, suggests the target ship generating methodology using random variables to improve the training efficiency of the existing simulator. In generating the target ships using this methodology, the speed, distance between the ships , and time interval of ships and time of ships were considered as a major factors which dterminie the ship's movements. The new methodology suggested was examined and found to generate target ships successfully giving a trainee the feeling of real situation.

There is a limitation for a ship which is sailing on sea to gather weather and seastate informations. To make up for this weakness , land organizations can gather wider variety of information and evaluate the seakeeping performance on ship. and supply this information to the ship. In this study, calculated the response amplitude of ship motions with the weather information provided in real time, the norminal speed loss with obtaining increased of resistance caused by wave and stochastic process of the seakeeping performance elements. And the results have been achieved to develop a system whichcan evaluate the synthetic seakeeping performance. Using this system , the results have been studied to determine the feasibility of using this simulation inactual operation onboard ship.

The safe passing maneuver of a large vessel along the designed course through a narrow channel in the flow of strong current is greatly related with her maneuvering characteristics. This paper treats maneuvering characteristic of a large vessel changing her course with the use of her control surface in a narrow channel with strong current. In this paper, the author proposed mathematical models of calculating maneuvering motions of the very large LNG tanker altering course using her control surface and calculated passing tracks of the vessel through the channel and compared the calculated results with those of maneuvering simulations by a desk-top simulator. In general the motions with the calculated values and the simulated motions are well coincided with each other.

본 연구에서는선박의 조종운동 중 중요한 과제인 접안운동을 자동화하기 위하여 현대제어이론중의 하나인 인공신경망(Artifical Neural Network, 이하 ANN으로 함)에 의한제어를 수행하였다.잘 알려진 바와 같이 ANN은 어떤 시스템의 입출력간의 연결상황과 요소들 내부의 처리방법을 정의하여 시스템을 표현하는 방법이다. 구체적으로는 시스템의 입출력에 대한 모범적인 교사 데이터(Teaching data)를 준비하여 교사데이타와 실제 입출력간의 오차가 최소가 되도록 학습을 시키게 된다. 학습의 결과 ANN은 그 시스템의 비선형성을 충분히 표현할 수가있어, 접안운동과 같은 비선형성이 강한 조종운도에 적합할 것으로 생각된다.

It is very difficult to execute the vibration analysis of a huge strucutre, which takes up much time and expense. In this paper we intend to make the equivalent system of a local vibration system of a huge structure with a view to improving the dynamic characteristics and reducing time and expense. First of all, upper deck structure model is maded. And we perform the vibration analysis by the Substructure Synthesis Method and execute the exciting test for the upper deck structure model, and observe the coincidences of two results to confirm the reliability of the analyzing tools used. To make the equivalent system, we give boundary condition to sub-structure that want to be modified and execute the Sensitivity Analysis Method and the Optimum Structural Modification Method. And we execute the structural modification of the equivalent system.. The following can be found from this study. 1. The analytical results are generally coincident with each other. 2. The equivalent system of the superstructure model can be easily obtained using the sensitivity analysis metho and the optimum structural modification method. 3. The structural modification using the equivalent system can be obtained good results above 90% of object value.

Recently , our govermment makes effort to prevent oil pollutin at sea. However, we still remain vulnerable to oil spills near the borders it shares with China, Japan and Russia due to legal and administrative impedements associated with cross-boundary spill response activity. For a reasonalbel domestic implementation of the International Conventions related oil pollution , our government has already accepted several Conventions such as SOLA 74 , MARPOL 73/78, STCW 78, CLC 69 and FC 71 except an International Convention on Oil Pollution Preparedness, Response and Co-operation, 1990. Therefore, this paper explores comprehesive legal structure applicable for future domestic legislation of international preparedness , response and co-operation on the base of the Convention, 1990. And also preliminary legal researches are to be done for earlier acceptance of the Convention, 1990. Consequently it is necessary to prepare natinal contigency plan and bilateral or multilateral agreements for oil pollution preparedness and response with adjacent natinos prior to acceptance of the Convention . In addition , it is also necessary that neighboring nations must take action to facilitate cross-boundary activities by responders providing responder immunity protection and by removing potential impediments to response activities by appropriate law and other requirements such as customs , immigration , and safety training.

The whistle is a very important information source for the safety navigation under foggy weather. But navigator has no concern about this , because it must be achieved by human hearing sense and considered as a vague signal. If the range and relative bearing of signa source can be detected automatically, it would be very useful system for preventing marine casualties making a lot of economic loss and environment pollution. Before the algorithm of 2-dimensinal sound source tracking system was reported . This paper describes the method that can obtain thetime lag between three signas and the theory of cross-correlation analysis and subtraction method for cauculating the time lag by using the digital signal data sequences. And a series of experiments were carried out for various position of sound source in the range from 200m to 530cm.

The purpose of this study was to analyze the physiology changes by circuit weight training(CWT). The subject of this study consists of 16 student on ship(experimental groups(SE) N=8, control group(SCa) N=8) and 16 students on land (experimental groups(LE) n=8, control groups(LCb) N=8). The items of measurement were the changes of CWT time and heart rate per week, musclear functino and cardiopulmonary function. The conclusions are as follows : 1. Muscular fuction 1) Back strength in SE and LE group was increased significantly (p<.01, p<.05, 8.86% and 7.08%).Grip strength was increased slightly in 4 groups but there was no significance. 2) In push-ups, all 4 groups were increased significantly (p<.05, p<.01), sit-ups also were increased significantly in SE and LE group (p<.05, 6.71% and 9.62%). 3) In SE and LE group , standing long jump was in significantly (p<.01, p<.05, 4.49% and 6.09%), but only in LE group , side step was increased significantly (p<0.1, 5.84%). 2. Cardiopulmonary function 1) HRrest was decreased slightly in all 4 groups but was not significant changes. HRmax was increased only in LE group significantly (p<.05, 2.81%), treadmill running time was increased significantly in SE and LE group respectively (p<.01, p<.05, 10.78% and 11.07%). 2) VEmax was increased significantly in SE and LE group(p<.05, p<.01, 10.59% and 13.68%), but only in LE group Rfmax was increased significantly (p<.01, 4.83%). 3) In VO2max, LCb group was increased significantly (p<.05, 6.835), but SCa group was decreased significantly (p<.05, 4.32). VO2max/kg$.$min was increased significantly in LE and LCb group respectively (p<.01 p<.05. 4.75% and 3.98%).