• 한국해양공학회지
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• 제37권5호
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• pp.181-189
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• 2023

The fuel consumption of marine diesel engines holds paramount importance in contemporary maritime transportation and shapes energy efficiency strategies of ocean-going vessels. Nonetheless, a noticeable gap in knowledge prevails concerning the influence of ship hull conditions and propeller roughness on fuel consumption. This study bridges this gap by utilizing artificial intelligence techniques in Matlab, particularly convolutional neural networks (CNNs) to comprehensively investigate these factors. We propose a time-series prediction model that was built on numerical simulations and aimed at forecasting ship hull and propeller conditions. The model's accuracy was validated through a meticulous comparison of predictions with actual ship-hull and propeller conditions. Furthermore, we executed a comparative analysis juxtaposing predictive outcomes with navigational environmental factors encompassing wind speed, wave height, and ship loading conditions by the fuzzy clustering method. This research's significance lies in its pivotal role as a foundation for fostering a more intricate understanding of energy consumption within the realm of maritime transport.

• 수산해양교육연구
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• 제28권6호
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• pp.1761-1771
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• 2016

In respect of the existing relation between Sea-going Vessels and Vessels at anchor, Korean Maritime Safety Tribunal has applied 'Ordinary Practice of Seamen' that is regulated by the article No. 2 of COLREG. That is, general navigation rule is not applied between the two vessels, and the action to avoid collision of vessels by utilizing experience knowledge of the seamen. However, the content of the Ordinary Practice of Seamen included in the revised plan in the process of 2011 "Maritime affairs Safety Act" revision was deleted in the screening of the Office of Legislation due to the reason that it could not specified when the content of deed is not concertized. Furthermore, prior application regulation of international treaty included in the existing "Sea Traffic Safety Act"(Article 5) was deleted in the screening of the National Assembly. So, doubt about whether the Ordinary Practice of Seamen could be continuously applied according to the regulation of the international treaty, nevertheless not specified in domestic law, has been continuously raised. In this situation, recently Central Maritime Safety Tribunal changed precedent by applying of Article 96(3) of Maritime Safety Act without applying Ordinary Practice of Seamen in the Case No. 2015-001. Accordingly, this study intended to review propriety of precedent change and legal issue with the decision of Central Maritime Safety Tribunal excluding Ordinary Practice of Seamen for a collision between Sea-going Vessels and Vessels at anchor.

• 수산해양교육연구
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• 제25권3호
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• pp.697-704
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• 2013

The aim of this paper is to represent about the actual conditions of manpower supply in seaman's competency certificate of fishing vessel. Data used here were based on Korea Seafarer's Statistical Year Book(2007~2011) issued by Ministry of Land, Transport, Maritime Affairs and Alma Mater of employed Seafarer's issued by Korea Seafarer's Welfare & Employment Center, and concerned various laws. The results are as follows : 1. The demanding officers(DO) in the present fishing vessels as minimum boarding standard of Ships Officers Act figured up 5,929 persons totally. Those are divided into officers of 2,988 persons and engineers of 2,941 persons. 2. Comparing DO with now boarding officer members, incase of Coastal & near-ocean fishing vessels exceeded approximately 11.5%(478 persons), but Ocean-going fishing vessels were short supply about 26.7%(477 persons). 3. In spite of ships officers' lacking in Ocean-going, boarding officers until now are only 3.5%(133 persons) annually of alma members in various fisheries schools.

• 한국항해항만학회지
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• 제39권2호
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• pp.107-113
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• 2015

This paper analyzes and evaluates the importance of energy saving measures based on qualitative survey. Through literature review and group interviews with specialists, 4 factors, 13 measures for energy savings, and 4 evaluation criteria were selected to carry out an Analytic Hierarchy Process (AHP) analysis. At the first stage of AHP analysis, the importance of factors was derived, and then the importance of 13 measures. Lastly, the cross examination of 4 factors was carried out in order to evaluate the best possible qualitative considerations. The result revealed that 'choosing the best course weather', is the most important factor with the highest value on applicability and operational complexity criteria. These results may imply that operational considerations are regarded as a main factor to be taken into account when considering appropriate energy saving measures.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.171-171
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• 2018

• 수산해양기술연구
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• 제55권4호
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• pp.356-362
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• 2019

We collected AIS information on fishing vessels operating near Jeju Island, and analyzed appearance density of the Chinese fishing vessels and inferred the movements of the fishing grounds. AIS information was received from October 16, 2016 to October 16, 2017 and stored on a hard disk through a program called AisDecoder. Unauthorized fishing vessels within the Exclusive Fisheries Agreement Zone (EFAZ) operated near the EFAZ boundary, and the frequency of appearance of fishing vessels were high in the middle waters of Korea and Japan, 252 and 250 fishing zones. Chinese fishing vessels authorized to enter appeared scattered outside the Prohibiting Fishing Zone of the Large Trawlers (PFZLT), and the closer they were to the PFZLT boundary, the higher the appearance density. And the appearance of Chinese fishing vessels with a speed from 0 to 3 knots was mostly outside the EFAZ, showing high density in the waters close to the boundary between Korea and Japan. On the other hand, within the EFAZ, the frequency of appearance of Chinese fishing vessels was also low and scattered. The appearance of Chinese fishing vessels with a speed from 3 to 5 knots mostly shows some variability within the EFAZ, but the frequency of appearance was high and the density was high. The seasonal appearance of Chinese fishing vessels in the waters south of Jeju Island appeared in the southwest in the autumn and then moved south and southeast of Jeju Island in the winter, and in the spring and summer. They were considered going to other fishing grounds without fishing in the waters south of Jeju Island.

• 한국항해항만학회지
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• 제43권6호
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• pp.384-394
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• 2019

이 연구는 우리나라 외항 상선에 승무하는 외국인 선원 관리제도의 현황을 고찰하고 제도상 문제점과 개선방안을 외국인 선원을 고용하고 있는 선주회사와 선박관리회사 그리고 선원관리회사, 관련 단체 대상으로 설문조사 결과를 분석하여 제시하였다. 그 결과로는 첫째 한국 선원과 같이 적용되는 외국인 선원 관련법 및 단체협약 등을 별도로 적용함이 필요하며, 둘째는 외국인 선원 고용정원의 의사결정 주체를 기존 선박소유자와 노동자 단체에서 선박소유자로 변경하거나 혹은 기존 의사결정 주체를 유지한다면 법률을 개정하여 명확히 하여야 하며 또한 외국인 선원 고용정원을 직책별 및 선종별로 지정할 필요가 있다. 셋째는 외국인 해기사 고용 시 선택의 폭을 확대하기 위하여 동유럽, 아시아 국가로의 해기 면허 인정협정을 확대하여야 하며, 넷째는 외국인 선원 고용 및 승선까지 복잡하고 불필요한 행정절차를 간소화하여야 한다. 다섯째는 외국인 선원과 관련된 회사 및 정부 기관, 협회 등 공동으로 외국인 선원에 대한 체계적인 양성체제 구축이 필요하다는 것이다. 동 연구를 통하여 우리나라 외항 상선에 승선하는 외국인 선원에 대한 더욱 효율적이고 체계적인 관리에 이바지할 수 있을 것이다.

• 대한조선학회논문집
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• 제56권6호
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• pp.532-540
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• 2019

This study describes a test method for evaluating the ice friction and abrasion performance of polar coatings. The evaluation methods of physical properties of general coatings for ocean-going vessels and polar coatings for ice-going vessels were investigated and their limitations were analyzed. We have also reviewed previous researches related to the development of polar paints and confirmed the necessity of developing test techniques. A flat steel plate was coated with several types of commercial coating, and cold model ice was used to cause ice friction and abrasion events between coated surface and ice. For evaluation of ice friction and abrasion performances, test procedures such as measurement of coating surface roughness, measurement of frictional force using model ice, implementation of ice abrasion and drying of coating surface were developed. The friction and abrasion characteristics of each coating are analyzed and summarized through the change of friction force and roughness data according to the progress of ice abrasion.

• Journal of Ship and Ocean Technology
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• 제1권1호
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• pp.57-72
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• 1997

The larger trends related to cracking in ocean going vessels (primarily tankers and bulk carriers) are reviewed on the basis of available data. The typical interrelated causes of such cracking are: high local stresses, extensive use of higher strength steels, inadequate treatment of dynamic loads, adverse operational factors (harsh weather, improper vessel handling), and controllable structural degradation (corrosion, wear, stevedore damage). Three consequences of cracking are then discussed: structural failure, pollution, and increased maintenance. The first two, while rare, are potentially of high consequence including loss of life. The types of solutions that can be employed to improve the durability of ships in the face of fatigue cracking are then presented. For existing vessels, these solutions range from repairs based on structural analysis or service experience, control of corrosion, and enhanced surveys. For new vessels, the use of advanced design procedures that specifically address dynamic loads and fatigue cracking is necessary. As the preferred solution to the problem of cracking in ships, this paper advocates prevention by explicit design by first principles.

• 한국항해항만학회지
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• 제48권1호
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• pp.7-16
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• 2024

외항 상선 선박 척수가 증가하고 있지만, 한국인 해기사가 감소하여 인력 부족 문제가 심각하게 대두되고 있는 상황에서 본 연구는 외항 상선 해기사 인력 수요와 공급을 결정하는 요인들을 객관적으로 측정하여 정확한 인력 수요와 공급을 예측하고자 하였다. 인력 수요는 선박 규모별 필요 해기사 수의 차이를 반영하여 선박 증가 예측치에 이를 적용하여 직급별로 예측하였다. 인력 공급은 Markov모형을 활용하여 연도별 승진, 이직, 퇴직, 신규 진입 등의 증감요인을 반영하여 직급별 연령별로 세분화하여 예측하였다. 외항 상선 해기사 인력 수요는 2023년 11,638명에서 2030년 13,879명으로 증가하고, 공급은 2023년 7,006명에서 2030년 6,426명으로 감소하여 2040년에는 부족인원이 1만명을 넘는 것으로 예측되었다. 본 연구는 객관적인 데이터와 과학적 분석방법 및 논리적 추론을 통해 예측의 정확도를 제고하여 외항 상선해기사 인력 부족 문제를 해결하는데 유용한 자료로 활용될 수 있을 것이다.