• 해양환경안전학회지
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• 제22권5호
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• pp.547-553
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• 2016

선박용 디젤엔진 배기가스에 포함된 입자상물질(PM) 가운데서 블랙카본(BC)은 극지방의 해빙을 촉진시키고 온난화를 유발하는 원인물질로서 큰 주목을 받고 있다. 본 연구에서는 향후 예상되는 PM/BC 배출 규제에 선제적으로 대응하고, 저감기술 개발 및 실증을 위한 기초연구의 일환으로 한국해양대학교 실습선 한바다호를 이용하여 실제 운항 중에 주기관의 배기관 수 포인트에서 PM을 샘플링하여 HR-TEM을 통해 그 구조와 특성을 분석하였다. 또한 배기가스 분석기를 이용하여 운전조건별 배기가스 내 유해물질의 배출 경향을 확인하였다. 분석 결과 엔진에서 배출된 PM의 구조는 구형 입자들의 촘촘하지 않은 체인형 결합으로 이루어져 있으며, 과급기로부터 멀어질수록 온도 저하에 의한 응집이 더 많이 관찰되었고 BC 특유의 graphitic 구조를 잃어가면서 점점 amorphous 구조를 띠는 경향이 나타났다. 또한 배기가스 분석을 통해 엔진 회전수가 증가할수록 배기 내 PM의 농도는 감소할 것으로 예측되었다.

• 해양환경안전학회지
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• 제27권7호
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• pp.1011-1022
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• 2021

해양경찰은 구조, 재난관리, 치안유지, 마약 및 밀수 단속, 주변국 대응, 환경보전, 해양안보 등 다양한 업무를 수행하는 국내 유일의 해양종합행정기관으로서 그 역할과 임무를 국민에게 제대로 알리는 홍보활동이 매우 중요하다. 하지만 해안가, 도서지역 주민들을 제외한 대부분의 국민들은 일상생활에서 해양경찰의 치안행정 서비스를 직접 접하는 경우가 드물고, 이로 인해 해양경찰의 역할과 임무에 대한 국민들의 이해도는 낮다. 이 연구는 해양경찰 재출범 3년차를 맞아 해양경찰 홍보 조직과 업무 현황을 고찰하고, 일선 홍보담당자를 대상으로 설문조사하여 해양경찰의 홍보 실태를 진단하고, 해양경찰 홍보 강화방안을 제시하였다. AHP분석 결과 해양경찰 홍보는 전담인력 증강 배치를 통해 홍보조직의 내실화를 기하고, 홍보대상에 따른 홍보 전략을 명확히 한 맞춤형 홍보를 강화하며, 홍보 담당자의 직무교육을 강화하고, 홍보 업무에 대한 지휘관 및 내부 구성원의 관심과 지원이 필요한 것으로 나타났다.

• 해양환경안전학회지
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• 제23권3호
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• pp.250-257
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• 2017

This paper investigates minimum safe distances relative to a ship's four cardinal sides, as perceived by Filipino navigators when encountering dangerous elements and in adverse weather conditions when maneuvering in and around harbors. It uses a descriptive research method in the form of a questionnaire survey for experienced Filipino navigators of various ranks. During the course of research, 71 responses were colleted and the resulting data is presented in graphical and tabulated forms. Statistical methods including Pearson-product moment correlations, Cronbach's Alpha and ANOVA were used to identify internal associations, consistencies and significances, respectively. It has been proven that there are no significant differences in minimum safe distances relative to a ship's four cardinal sides, whether maneuvering while approaching a port or within an inner harbor. This study has been deemed significant for training future navigators, managing traffic in fairways, and designing harbors and maneuvering areas in the approaches to ports, among other applications. This work can also be used as a preliminary study for comparison with the well known safe domains presently in use.

• 수산해양교육연구
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• 제26권5호
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• pp.966-978
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• 2014

Currently, majority small ship's clutch for power transmission to propeller relies on multi plate hydraulic clutch regardless its size. Most of the small ships do not have a spare equipments of clutch. Furthermore, many ship engineers do not have an ability as well as enough experience to solve this problem related to the hydraulic clutch during the voyage. Therefore, any small problems cause many serious marine accidents. Once the clutch has problem, almost of all ships can not sail by itself anymore and it must be towed by salvage boat, maritime police ships, or fish guidance boat etc. In this case, all the accidents will be categorized as a marine accident and they all need to go through marine accident court inquiries. In this study, an understanding of each crew on hydraulic clutch system has been profoundly measured. Furthermore, the knowledge on an emergency navigation protocol of each crew has been also profoundly checked. Additionally, various surveys on hydraulic clutch classes has been performed and its satisfaction of crews on this topic have been carefully checked based on various feedback from students who took these courses. All of the above data from this study will be used to reduce marine accidents in current marine industry.

• 수산해양교육연구
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• 제25권2호
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• pp.448-457
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• 2013

The media is an effective means of preventing crime. It can be known to members of the media presiding over the most widely and rapidly. Because of this, the mass media is a good way to prevent such crime. Related to general crime, marine crime will have unique characteristics and about Crimes reported by the media, it is also true. The results of this study are as follows. Firstly, it is required that the more accurate present article must be published and reported. Secondly, for more accurate presentation of measure, there is a need to enhance professional training for reporters. Thirdly, the marine weather report is the most important political purpose of considering marine crime prevention. Forthly, marine crime is likely to be a lack of evidence. Therefore, in order to supplement the lack of evidence maritime security agency should be utilized for a news source.qualification Fifthly, the need for regular inspection of the articles is requested. Sixthly, for judicial control maintenance of the media related laws should be strengthened. Finally, the arbitration institution for media rights should be established under the Korea Ministry of Land Infrastructure and Transport. This is practical action for marine crime prevention.

• 수산해양교육연구
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• 제27권3호
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• pp.725-734
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• 2015

In contemporary society, many fishery industries face a serious problem of having an insufficient number of junior ship officers and engineers. Even though many fishery high schools in Korea made significant effort to produce many talented junior officers and engineers, but after graduation, the students are reluctant to get a job on the fishing vessels. Furthermore, Korean government also invested a large amount of money to train students for ocean-going and costal & near-ocean fishing vessels. However, despite the government's great effort on the training program and education, only a few students wish to work on the fishing vessels. In this article, the author tried to find answers for various questions such as what are the factors that the student prefer, where the student to want to get a job in fishery industries, and how student feel about working at fishing vessels. Furthermore, the author also analyzed the differences between high school student group and Korea Institute of Maritime and Fisheries Technology(KIMFT) student group about occupational orientation by utilizing SPSS statistical program. Additionally, the author surveyed the current onboard status of job position of the high school and KIMFT alumni. This study's results and data will be used for aiding further stimulation and advertisement of job position in fishing vessels and continued daily lives on board.

• 한국항해항만학회지
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• 제30권5호
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• pp.321-329
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• 2006

이 연구의 최종목적은 기존의 선박용 자기 컴퍼스를 대체할 수 있는 디지털 컴퍼스 개발에 있다. 우선, 3축의 고정밀 프럭스-게이트센서와 소형 스텝 모터를 이용하여 새로운 디지털 컴퍼스 장치를 개발하였다. 그리고 기존 자차측정 방법과 달리 선박의 선회 없이 자동으로 자차의 분석과 수정이 가능하도록 기존 자차이론에 칼만필터 개념을 접목시킨 새로운 자차수정 이론을 제안하였다. 개발한 디지털 컴퍼스와 제안한 자차수정 방법의 유효성을 실습선 '새누리호'를 이용한 성능평가 실험을 통하여 유효성을 검증하였다.

• Corrosion Science and Technology
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• 제20권2호
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• pp.52-61
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• 2021

This study using experimental design and linear regression technique was implemented in order to predict the pitting potential of stainless steel in marine environments, with the target materials being AL-6XN and STS 316L. The various variables (inputs) which affect stainless steel's pitting potential included the pitting resistance equivalent number (PRNE), temperature, pH, Cl^- concentration, sulfate levels, and nitrate levels. Among them, significant factors affecting pitting potential were chosen through an experimental design method (screening design, full factor design, analysis of variance). The potentiodynamic polarization test was performed based on the experimental design, including significant factor levels. From these testing methods, a total 32 polarization curves were obtained, which were used as training data for the linear regression model. As a result of the model's validation, it showed an acceptable prediction performance, which was statistically significant within the 95% confidence level. The linear regression model based on the full factorial design and ANOVA also showed a high confidence level in the prediction of pitting potential. This study confirmed the possibility to predict the pitting potential of stainless steel according to various variables used with experimental linear regression design.

• Corrosion Science and Technology
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• 제20권6호
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• pp.384-390
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• 2021

In this paper, durability evaluation and surface damage mechanism were investigated through solid particle erosion (SPE) test after applying hot-dip aluminizing (HDA) technology for the purpose of maintenance of marine economizer tube. Damaged surface shape was analyzed using SEM and 3D microscope. Compositional changes and microstructure of the HDA layer were analyzed through EDS and XRD. Durability was evaluated by analyzing weight loss and surface damage depth after SPE. HDA was confirmed to have a two-layer structure of Al and Al₅Fe₂. HDA+HT was made into a single alloy layer of Al₅Fe₂ by diffusion treatment. In the microstructure of HDA+HT, void and crack defect were induced during the crystal phase transformation process. The SPE damage mechanism depends on material properties. Plastic deformation occurred in the substrate and HDA due to ductility, whereas weight loss due to brittleness occurred significantly in HDA+HT. As a result, the substrate and HDA showed better SPE resistance than HDA+HT.

• 수산해양기술연구
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• 제57권4호
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• pp.401-409
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• 2021

In this study, an improvement plan was derived by statistically analyzing the system and current status of tests in Korea and survey of seafarers perception in order to improve the expertise of the Korean fishing vessel officer examination. Recently, about 70% of marine accident occurs from fishing vessels. Therefore, it's necessary to improve the examination to reduce marine accidents. As a result, it was identified that an average of 29,265 applicants have applied over the past four years, and among them, 1,833 people have applied for fishing vessel licenses, accounting for 6.3% of the total. According to the result of explanation and response of 115 people, they responded that practical utilization was low, each operation waters has different requirements and it's necessary to improve the contents of the questions for the specialty subject. In addition, inappropriate questions were found in previous exams. To reduce marine accidents caused by human error and to improve the professionalism of fishing vessel officers, it is necessary to adjust the test criteria and ratio with characteristics of fishing vessels and in the long run, institutional improvements such as the distinction between test subjects and licenses are needed.