• Journal of Advanced Marine Engineering and Technology
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• 제32권5호
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• pp.775-784
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• 2008

It is not easy to access very high speed Internet services at sea due to some technical and economical problems. In order to realize the very high speed Internet services at sea like on land, new communication network models based on MANET should be adopted. In this paper, a new MANET model at sea is provided, which considered the ocean environments, and the characteristics and movement of vessels. On the basis of the fact that most vessels navigate on the predetermined courses, which are the shortest paths between source and destination ports in most cases, a type of location oriented routing protocol is proposed in this paper. The Hybrid Course-Based Routing Protocol(HCBR) makes use of the static information such as courses and positions of ports to proactively find the shortest paths not only among ports but also the cross points of courses. HCBR also makes use of the locational information of vessels obtained via GPS and AIS systems to reactively discover the shortest route by which data packets are delivered between them. We have simulated the comparison of the performance of HCBR with those of LAR scheme 1 and scheme2, the most typical protocols using geographical information. The simulation results show that HCBR guarantees the route discovery even without using any control packet. They also show that HCBR is more reliable(40%) and is able to obtain more optimal routes(10%) than LAR scheme1 and scheme2 protocols.

• 해양환경안전학회지
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• 제14권1호
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• pp.89-93
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• 2008

보강판은 선박이나 해양구조물에서 폭넓게 사용되고 있는 기본적인 강도 부재이다. 이러한 보강판은 선박의 갑판부, 선측부, 선저부에 흔히 사용되고 있다. 보강판은 보강재가 어느 한 방향으로 또는 양방향으로 구성되어 있으며 후자에 대해서 보통 그릴리지라고 한다. 보강판의 좌굴 및 소성붕괴는 선각거더의 파손 원인이 되므로 좌굴 및 최종강도가 정확하게 규명할 필요가 있다. 본 연구에서는 범용유한요소해석코드인 ANSYS를 이용하여 좌굴 및 좌굴 후 거동에 대한 평가를 수행하고 보강재 치수변화, 수압의 영향을 고려하여 압축최종강도에 대해 해석 수행하였다.

• 해양환경안전학회지
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• 제22권1호
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• pp.67-73
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• 2016

항만물동량이 증가하고 선박의 대형화가 급격하게 이루어짐에 따라 부두의 설계 접안능력보다 큰 선박이 부두를 이용하는 사례가 빈번하게 발생하고 있다. 본 연구에서는 우리나라 주요 위험물 취급항만인 울산항을 대상으로 접안능력을 초과하여 위험물 부두를 이용한 선박 실태를 조사하였고 기존 부두 접안능력의 최대 3배가 넘는 선박이 이용하는 것으로 분석하였다. 그에 따라, 50,000 DWT급 부두를 모델링하여 50,000 DWT급, 70,000 DWT급, 100,000 DWT급 선박을 대상으로 계류 프로그램을 통해 선박 규모의 변화에 따른 계류 안전성 평가를 수행하였다. 평가는 OCIMF에서 제시하고 있는 표준환경기준에 따라 수행되었으며 50,000 DWT급 선박은 대체로 허용기준을 만족하는 것으로 평가되었으나, 70,000 DWT급 선박의 경우 풍속 60 kts, 파고 1.5 m 이상의 기상조건에서 100,000 DWT급 선박은 풍속 60 kts 조건 등에서 허용한계를 초과하는 것으로 분석되었다. 도출된 결과를 바탕으로 평가 대상부두에 대한 안전 계류 가이드라인 사례를 제시하였고 향후 다양한 사례에 대한 평가를 수행하여 해당항만에 일반적으로 적용 가능한 가이드라인을 수립하도록 제언하였다.

• 한국인터넷방송통신학회논문지
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• 제17권1호
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• pp.145-151
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• 2017

본 논문은 선박 평형수 처리 시스템에서 여러 센서 장치들이 원격으로 전송한 데이터 특성을 토대로 장치의 고장 예측과 목적지 운항경로 상의 수리지점 대상 가장 효율적인 지점 선정 및 수리 예약하는 시스템의 설계 및 구현을 제시하였다. 이러한 데이터는 선박에 평형수를 채우거나 비울 시에 실시간으로 수집되며, 정상과 비정상의 테이타 특성을 분석하여 비 안정적 특성을 보이는 장치에 대한 사전 수리가 필수적이다. 선박이 다음 목적지를 향한 항로 운항 중 이네비게이션을 기반한 가장 효율적인 수리 센터를 선택하여 예약하는 고장 예측 및 수리 예약을 위한 소프트웨어 플랫폼을 제시하였다. 본 시스템의 적용은, 해양 오염 방지를 위한 IMO의 협약이 2017년도에 발표됨에 따라, 선박들의 안정적인 입출항과 해양 생태계 보호하며, 또한 안정적 화물 운항으로 인한 경제적 효과가 매우 높다.

• 수산해양교육연구
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• 제29권1호
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• pp.137-147
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• 2017

An accident during pilotage may cause several problems such as crippling the harbour function, environmental disruption, loss of life. Since the pilot plays an important role in the safe operation of the port, securing their safety is directly connected to the vessel's safety coming into port in Korea. Pilotage service is offered on request without distinction of day and night. And traveling by helicopter and boarding/disembarking using a pilot ladder from and to a pilot boat have a high risk of falling into the sea. So, pilots can fall into the sea while boarding/disembarking from ship which can lead to serious injury by cardiac arrest. A number of pilots have died or severely injured due to fall from the pilot ladder during embarkation and disembarkation up to now. Current safety measures at embarkation and disembarkation required by pilotage act and IMO resolutions could not prevent all the pilot related accidents. Therefore, to prevent pilot accident during boarding/disembarking from ship, it is necessary to include safety training requirement for new pilots under the requirements for licensing of pilotage act. It is also necessary to compel pilots to take necessary personal protective equipment when they use a pilot ladder. In addition, the placement of emergency kit on pilot boats and first-aid training are required in order to deal with emergency situation promptly.

• 수산해양기술연구
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• 제52권1호
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• pp.56-64
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• 2016

This study analyzed characteristics of officers' watch-keeping during fishing operation at the fisheries training ship KAYA (GT: 1,737 tons, Pukyong National University). It observed fishing works of three officers in wheel house of KAYA. The observations were carried out at the fishing ground 45 miles away from east of Jeju from 7 to 8 January 2010. The works and movements of the officers were recorded with three common video cameras and a 4-channel MPEG-4 Triplex DVR. Recorded data of the working circulation was analyzed by using the post-processing method. As a result of the traffic lines, the average (${\pm}S.D$) of working hour (min) and moving frequency (times), distance (m) and speed (m/min) during setting the net was 11.8 (0.9), 43.7 (8.1), 133.9 (35.8) and 10.5 (0.6), respectively. During trawling the net, it was 100, 241 (39.8), 615.7 (194.6) and 5.2 (1.6), respectively. During hauling the net, it was 17.6 (1.4), 41.0 (7.2), 196.9 (37.6) and 10.7 (0.8), respectively. In addition, it has a different tendency of the instrument usage frequency by the fishing works. During setting, the usage priority was CCTV, ECDIS, RPM and pitch controller, net monitor, GPS plotter, chart room, X-band radar, fish finder and public addressor. During trawling, it was CCTV, ECDIS, fish finder, X-band radar, net monitor, chart room, GPS plotter, RPM and pitch controller, auto pilot and steering, interphone, wind speed and direction indicator, No.1. VHF, navigation light control panel and public addressor. During hauling, it was CCTV, RPM and pitch controller, GPS plotter, public addressor, chart room, net monitor, X-band radar, auto pilot and steering and fish finder.

• 수산해양기술연구
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• 제51권4호
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• pp.512-519
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• 2015

A historical tragic disaster happened by capsizing the passenger ship Sewol at South Western Sea of Korea in 16, April 2014. The ship which left Incheon harbour to bound for Jeju port passed Maengol strait and reached to approach of Byung Pung island, and then capsized and sank with a sudden inclination to the portside in the mean time of starboard the helm. In this time, the ship which has very poor stability without sufficient ballast waters and with over loading cargo listed port side caused by the centrifugal force acting to the outside of turning. A lot of cargoes not fastened moved to the port side consequently, and the ship came to beam end to capsize and sank in the end. No crews including especially captain would offer their own duties in a such extremely urgent time, as a result, enormous number of victims broke out including a lot of student. In this report, author carried out some calculation on the factors which influenced on the stability of the ship, i.e. the ship's speed, the rudder angle, the weight of cargoes and distance of movement, the surface effect of liquid in the tank. We found out that the most causes of capsize were the poor stability with heavy cargoes and insufficient amount of ballast water against the rule, and the cargoes unfastened moved one side to add the inclination as well. Above all, the owner be blamable because of the illegally operating the ship without keeping the rule.

• Journal of Advanced Marine Engineering and Technology
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• 제39권9호
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• pp.981-986
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• 2015

지구온난화에 대한 심각성이 대두되면서 선박부문의 온실가스 배출에 관한 연구가 전 세계적으로 활발하게 진행되고 있다. 이에 반하여 국내 연구 수준은 기초에 그치고 있다. 본 논문에서는 선박으로부터 배출되는 이산화탄소의 여러가지 저감대책 중에서 운항손실과 투자비용을 최소화하면서 수행할 수 있는 방법으로 전자제어엔진 사용, 트림 최적화, 프로펠러 연마 및 친환경 방오도료의 사용을 선정하였다. 선정된 저감대책들을 운항실습선에 적용하여 시험 운항을 실시하였고 연료소비율에 미치는 영향을 분석하였다. 그 결과, 각 대책들은 약 1~5%의 연료소비율 저감 효과가 있었고 이를 에너지효율운항지수 산출에 적용하면 약 1~5%를 감소시키는 것을 알 수 있었다. 향후 국제적 환경규제를 제정할 때 우리나라에게 유리하도록 대응하기 위해서는 에너지효율운항지수에 대한 연구에도 지속적인 노력이 필요하다고 사료된다.

• 한국항해항만학회지
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• 제26권1호
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• pp.66-77
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• 2002

Generally hull insurance is undertaken by mean of a contract of hull insurance. A contract of hul1 insurance here is a contract whereby the insurer undertakes to indemnify the assured against the loss and damage to the vessel mused by maritime perils. A contract of hull insurance is consists of printed main insurance clauses and a clause includes many sub-clauses. Now the Institute Time Clauses-Hulls (hereunder refer to as "English hull insurance clauses"made by the Institute of London Underwriters is much used as the standard from or basic from by many countries ail over the world Now Korean insurance companies hue not made our their own hull insurance clauses, they have just adopted the made-out English hull insurance clauses and the english law and practice to solve the problem related to marine insurance. On the other hand, the United States of America and Japan have made out their own hull insurance clauses based on English hull insurance clauses and used the clauses for many years. Now American is using American Institute Hull Clauses(hereunder refer to as "American hul1 insurance clauses"as its own clauses which was made out by American Institute of Marine Underwriters in 1977 and Japan is also wing its own clauses named Japanese Hull Standard Clauses(hereunder refer to as "Japanese hull clauses") which was made out by japanese Hull Insurance Association in 1990. Therefore the purpose of this study is not only to make a comparative study on English hull insurance clauses 1995, American hull insurance clauses 1977 and Japanese hull clauses l990, but also to supply on some legal materials necessary for Korea to establish and perform our own hull insurance clauses.

• 수산해양기술연구
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• 제52권3호
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• pp.276-280
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• 2016

This study investigated luring distributions by water layer of common squid which were targeted by angling fishing vessels equipped with LED and metal-halide lamps using a scientific echosounder with a 120 kHz frequency in order to develop energy-effective underwater fish aggregation devices. In the analysis, angles of a transducer were changed from $0^{\circ}$ to $45^{\circ}$ and were rotated every $10^{\circ}$ horizontally. It was shown that common squid were densely distributed from the surface to 40 m and they were also distributed in directions of $10^{\circ}{\sim}+30^{\circ}$, $-30^{\circ}{\sim}-60^{\circ}$, and $-120^{\circ}{\sim}-130^{\circ}$with the head of vessel as the center. Comparative results of angles of transducer on acoustical densities of common squid distributing in 21~40 m water depth showed an average $101.8m^2/nm^2$ in vertical direction of $0^{\circ}$, $12.3m^2/nm^2$ in angle of $30^{\circ}$, and $42.4m^2/nm^2$ in angle of $45^{\circ}$, respectively. It implied that more considerations on acoustic scattering strength by incidence angle direction of the transducer and swimming oriental angle direction of common squid would be required.