• 한국해양공학회지
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• 제20권1호
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• pp.37-42
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• 2006

In the ocean engineering field, information about the ocean environment is important for planning, design, and operation, especially the wave information. High precision wave data is also important for considering environmental problems, like efficient operation of ships. For this purpose, many methods were considered in the past. However, an on-board directing wave measurement system has not been incorporated. The use of conventional marine radar Plane Position Indicator (PPI) images allows the estimation of wave information on a real-time basis, using both space and time information, regarding the evolution of ocean surface waves. In order to achieve data acquisition, the Radar Scan Converter (RSC) has been developed. Three-dimensional analysis was performed. The comparison of wave information derived from this system, and that of wave buoy, shows that this wave field detecting system can be a useful tool.

• 해양환경안전학회지
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• 제24권6호
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• pp.654-661
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• 2018

본 논문에서는 마리나 항의 상하가 시설 및 장비의 형태를 분석하고 마리나 이용 대상 선박을 기준으로 기 설치된 마리나의 상하가 시설(리프트 피어)과 장비(마린 모바일 리프트)에 대한 분석을 통해 상하가 시설 및 장비의 설치기준을 마련했다. 국내에서 운항중인 선박 총톤수에 따라 요구되는 리프트 피어의 내부 간격은 35톤 선박은 5.50 m, 50톤 선박은 6.20 m이며, 이를 상하가하기 위한 마린 모바일 리프트의 내측 폭은 35톤 선박은 6.10 m, 50톤 선박은 6.80 m가 필요하다. 국내 마리나에 설치된 리프트 피어는 목표한 선박을 인양할 수 있는 곳은 2곳으로 나타났으며, 그 외 다른 마리나의 리프트 피어 내부 간격은 0.35 ~ 0.50 m가량 좁았다. 또한 운용 중인 마린 모바일 리프트 중 목표한 선박을 상하가하기 위해 필요한 내측 폭을 확보한 장비는 2개로 나타났으며, 그 외 마린 모바일 리프트 내측 폭이 0.3 ~ 0.6 m가량 부족했다.

• 해양안보
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• 제8권1호
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• pp.73-102
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• 2024

최근 중국의 부상은 미중 간 패권경쟁의 심화를 촉진할 가능성이 있다. 중국은 반접근/지역거부(A2/AD)로 대표되는 해양에서의 군사행동을 통해 역내에서 영향력을 강화하고 있다. 미국은 중국의 A2/AD에 대응하고 미중 경쟁에서 우위를 달성하기 위해 새로운 작전개념을 정립하고 있다. 특히, 본 연구는 미 해병대가 주로 도서를 중심으로 한원정전진기지작전(EABO)을 통해 해양거부의 수단으로서 해군작전에 기여하고, 해양에서의 영향력 강화를 위한 변화에 주목하였다. 이러한 미 해병대의 변화를 한국 해병대에 적용하여 합동 및 해군작전에 기여할 수 있는 미래 한국 해병대의 공세적 도서지역 작전수행 방향을 제시하였다. 본 연구는 도서의 전략적 가치를 활용한 해병대의 공세적 도서지역 작전수행을 해양거부의 관점에서 제시하였다는 점에서 의미가 있다. 그러나 작전수행과 군사력 건설 / 발전방향을 개념적으로 제시하여 향후 이 부분에 대한 구체적인 논의가 필요하다. 본 연구가 그 출발점이 되기를 기대한다.

• Journal of Power Electronics
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• 제15권3호
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• pp.741-752
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• 2015

This study proposes a new solution for the parallel operation of microgrid inverters in terms of circuit topology and control structure. A combined three-phase four-wire inverter composed of three single-phase full-bridge circuits is adopted. Moreover, the control structure is based on adaptive three-order sliding-mode control and wireless load-sharing control. The significant contributions are as follows. 1) Adaptive sliding-mode control performance in inner voltage loop can effectively reject both voltage and load disturbances. 2) Virtual resistive-output-impedance loop is applied in intermediate loop to achieve excellent power-sharing accuracy, and load power can be shared proportionally to the power rating of the inverter when loads are unbalanced or nonlinear. 3) Transient droop terms are added to the conventional power outer loop to improve dynamic response and disturbance rejection performance. Finally, theoretical analysis and test results are presented to validate the effectiveness of the proposed control scheme.

• 해양환경안전학회지
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• 제12권4호
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• pp.307-312
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• 2006

최근 들어 선박직원법상 승무기준의 개정의 필요성에 대한 강력한 주장이 수산업계에서 제기되었다. 수산업계에서는 승무기준완화 입장을 유지하는 반면 노동계와 해기사협회 및 통신사협회는 현행유지 내지 기준의 강화를 주장하였다. 본 연구는 선박안전운항을 확보하기 위하여 선박직원법상 소형선박조종사 승무기준의 타당성과 그 개선 방안을 연구 제시하고자 한다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.373-376
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• 2006

Marine officers should have crisis control ability because ship operation needs not only highly specialized information, but also functional capability due to the fact that there always exist dangers at sea, which are different from those at shore. Therefore, marine officers should be trained on the related specialized information under the systematical educational system including shipboard training. Their training is also based on the strong spiritual power and physical strength through the strict training process. In order to have these vocational personalities, dormitory life training and shipboard training courses seem to be essential processes, which are required of maritime education. The introduction of automatic system into the ship as a result of the recent development of technology brings decrease of the full number of crew. Consequently, marine officers are increasingly under heavy burden, and should have more ship operation capabilities than before. Maine officers should have not only specialized information which differs from that at shore, but also vocational adaptability which can reasonably tackle with all the problems which exist on the spot and are obstacles to individual, spiritual, physical, natural, and social demands. So it is required that marine officers should have study many areas to deal with as extra curricula besides their major field of study, which are unique characteristics of the education for them. These vocational adaptabilities are based on the spiritual characteristics, such as self-developmental education, responsibility, meticulous care, attentiveness, voluntary, planning, readiness, spontaneity, accuracy, self-denial, obedience, leadership, and etc.

• 한국항해항만학회지
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• 제31권4호
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• pp.281-287
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• 2007

Human factors have been considered the primary reason of marine accidents. Especially, the collision between vessels is mostly mused by human behavior. However, there have not been many researches to clarify the reason of marine accidents mused by human factors quantitatively. In order to understand human factors and to enhance safe navigation systematically, using a full mission ship-handling simulator, we've investigated the characteristics of avoiding behavior taken by mariners. Further in order to apply the characteristics more widely and effectively, it's necessary to formulate the standard behavior for ship-handling in the condition of collision avoidance. Is this study, therefore, we intended to propose the concept to model the mariner's standard behavior on the handling of collision avoidance as the first step. As a result, we confirmed the contents of information processing in ship-handling that mariner's generally taking to avoid collision.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2022년도 추계학술대회
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• pp.300-301
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• 2022

신규 해상교통수단을 통한 섬 접근 이동성 강화를 위해서는 해당 선박의 투입에 따른 객관적인 사업성에 대한 검토가 필요하다. 본 연구에서는 기존에 운영 중인 유사 해양레저선박 운영비와 운임기준을 근거로 하여 비용과 수입을 추정한 뒤, 이를 바탕으로 비용-편익 분석, 순현재가치, 내부수익률을 통해 사업 타당성을 실증적으로 분석하였다. 또한 최소 경제성 확보를 위한 요건을 파악하기 위하여 항목별로 민감도 분석을 수행하였다. 연구결과 신조선 도입을 가정하였을 때, B/C 비율이 1.042, NPV는 1.93억 원, IRR은 2.1%로 추정되어 수익성이 미약하게 확보되는 것으로 분석되었다.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2007년도 추계학술발표회
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• pp.157-159
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• 2007

• 수산해양교육연구
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• 제7권2호
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• pp.173-181
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• 1995

In this paper, marine casualties occurred in Korean coastal and near-coastal seas, from 1989 to 1993, were analysed. The main results obtained were as follows : 1. According to the numerical component ratio of marine casualties, fishing vessels account for higher portion than other vessels and passenger vessels lower portion. On the other hand, in view of the occurring ratio of that, fishing vessels account for very low rate of accidents and passenger vessels very high rate. 2. Most of marine casualties resulted from the human factors such as careless operation and insufficient engine maintenance, etc. Collision accidents took a majority of all marine accidents in all of vessels, but engine trouble accounted for main cause of accidents in fishing vessels. 3. In view of the results on classifying marine casualties into time zone, great number of accidents took place in dawn, but that of fishing vessels in forenoon. 4. According to the view of the occurring ratio of the injury, the rate was 0.33% in total vessels and 0.18% in fishing vessels. 5. In view of the marine casualties by age and shipboard career, crews with 10~20 years shipboard career raised more marine accidents than others.