• 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.

• Journal of Advanced Marine Engineering and Technology
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• 제36권2호
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• pp.250-257
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• 2012

오늘날 큰 선박 및 구조물은 블록 형태로 만들어지고 조립된다. 수천 톤의 큰 대형 선박은 도크 또는 육상에서 큰 블록을 조립함으로써 짧은 기간 내에 만들어 진다. 이동 과정에 경사면을 만나게 되면 이동물이 기울어지게 되고 기울어진 상태로 경사면을 통과하는 경우, 블록이 전복하는 사고가 종종 발생한다. 본 연구는 트렌스포터의 이송 중량물의 평면상에서 무게 중심을 구하고, 더불어 3차원 상의 무게 중심을 구한다. 또한, ZMP(Zero Moment Point)를 이용하여 물체가 넘어지는 각도를 예측하는 연구를 수행하였다. 특히 경사면에서 물체의 이송과정 안정성을 시뮬레이션을 통하여 확인하였다.

• 한국인터넷방송통신학회논문지
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• 제17권2호
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• pp.69-74
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• 2017

최근 연안지역에 선박 통항량이 증가하고 있어, 그에 따른 해양사고도 증가하고 있다. IMO에서 안전운항을 위하여 안전 장비를 의무적으로 장착하도록 권고하고 있다. 대부분의 중대형 선박은 거의 안전운항 장비를 구비하고 있지만, 소형 선박은 선주의 재정상 어려움 또는 무관심 때문에 구비하지 않는 경우가 많이 있다. 그러므로 여안 지역에서 소형선박의 안전을 위하여, 좌초, 침몰, 그리고 충돌 등과 같은 해양 사고를 미리 예방하거나 또는 사고 발생 시 신속히 대처할 수 있어야 한다. 이 논문에서는 이와 같은 기능을 수행하는 소형선박용 안전 장비를 개발하였다. 이 장비는 선원의 스마트폰 및 저렴한 전용 단말상에 이런 상태를 표시해 주고 동시에 이런 상태를 제어센터와 인근에 있는 선박에 전송함으로써 무방비 상태에 있는 소형 선박의 안전을 상당히 보장해 줄 수 있다.

• 한국항해항만학회지
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• 제42권6호
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• pp.446-452
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• 2018

항로는 선박의 통항이 빈번하여 사고의 위험이 높은 지역이지만, 선박의 통항분포에만 초점을 맞춘 연구가 다수였으며, 항로의 특성과 선박의 크기별 통항패턴에 대한 연구는 부족하였다. 이에 본 연구에서는 3개의 주요 항로에서의 통항분포와 통항패턴을 분석하기 위해서 3일간의 선박의 통항현황을 조사하였다. 통항현황을 바탕으로 항로를 10개의 Gate line으로 구분하고 각 Gate line을 통과하는 선박크기를 소형선, 중형선, 대형선으로 세 분류하여 분석하였다. 각 항로의 통항분석을 바탕으로 각 Gate line에서의 통항분포에 대하여 ND-K-S(Normal Distribution-Kurtosis-Skewness)를 적용하여 평가하였다. ND 평가 결과 통항분포에서 대형선은 정규분포를, 중형선은 편도항로에서만 정규분포를 만족하고, 소형선은 정규분포를 만족하지 않는 것으로 평가되었다. K-S 평가 결과 통항패턴은 왕복항로와 편도항로에서 뚜렷한 구분을 보였다. K 평가의 결과 편도항로에서는 고루 항로를 이용하는 통항패턴을 가지지만, 왕복항로에서는 항로의 한 부분에 집중하는 통항패턴을 가지는 것으로 평가되고, S 평가의 결과 편도항로에서는 항로의 중앙을 따라 항행하는 통항패턴을 가지지만, 왕복항로에서는 항로의 우측에 치우치는 통항패턴을 가지는 것으로 평가되었다. 다만 본 연구는 3개의 주요 항로를 비교한 만큼 향후 다양한 환경에서의 항로분석이 필요할 것으로 판단된다.

• Journal of Chest Surgery
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• 제27권11호
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• pp.973-976
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• 1994

Angiomatosis [ or Diffuse Hemangima] is a rare condition in which large segments of the body are involved by proliferating vessels. By now, some authers say that this lesion begins during early intrauterine life when the limb buds form, grow proportionately with the fetus, and consequently affect large areas of the trunk or extremity. The majority of angiomatoses present during childhood or infancy as swelling, induration, or discoloration of the affected area. The patient was 13 year old male and had no specific signs and symptoms except palpable mass on the left lateral chest wall from childhood and a painful tender mass on the posterior chest wall for 5 days before admission. The chest PA showed no abnormalities.The operation was done with the resection of left 10th rib and 9th and 10th intercostal muscles including masses and the ligation of the both intercostal and feeding vessels of the masses. The pathologic result was angiomatosis involving intercostal muscles and rib.

• Journal of Advanced Marine Engineering and Technology
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• 제39권2호
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• pp.130-135
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• 2015

Recently, as a result of the application of large and multi-blade propellers with high efficiency for large vessels, the vertical bending stiffness of propulsion shafting system tends to be declined. For some specific vessels, the shaft arrangement leads to the forward stern tube bearing to be omitted, decreasing vertical bending stiffness. In this respect, decreased vertical bending stiffness causes the problem which is the blade order resonance frequency to be placed within the operational rpm range of propulsion shafting system. To verify whirling vibration, the measurement should be carried out covering from operating rpm up to target rpm, however, the range is un-measurable generally. In order to resolve the measurement issue, this study shows the measuring method and the assessment method of relevant natural frequency of whiling vibration by using measured harmonic order component of whirling vibration.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2012년도 전기공동학술대회 논문집
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• pp.184-184
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• 2012

Recently, as a result of the application of large and multi-blade propellers with high efficiency for large vessels, the vertical bending stiffness of propulsion shafting system tends to be declined. For some specific vessels, the shaft arrangement leads to the forward stern tube bearing to be omitted, decreasing vertical bending stiffness. In this respect, decreased vertical bending stiffness causes the problem which is the blade order resonance frequency to be placed within the operational range of propulsion shafting system. To verify whirling vibration, the measurement should be carried out covering the range of MCR, however, the range is un-measurable. To resolve the measurement issue, this study shows the measuring method and the estimating method of whiling vibration by using resonance frequency of sub harmonic.

• 한국압력기기공학회 논문집
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• 제13권1호
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• pp.16-39
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• 2017

This paper reviewed and summarized the experimental studies conducted during last three decades to evaluate the structural integrity and to establish the acceptance criteria for piping system of nuclear power plants (NPPs) under seismic loading condition. These experimental studies contain the results of large-scale piping system tests under excessive seismic loading as well as standard specimen tests, simplified piping specimen tests, and piping components tests under simplified dynamic and cyclic loading. These would be useful as a basis for establishing integrity assessment procedure and acceptance criteria for piping systems of NPPs under beyond design basis earthquake (BDBE) conditions, and also could be used in planing the scope and direction of further related researches.

• Journal of Chest Surgery
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• 제51권6호
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• pp.415-418
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• 2018

A solitary fibrous tumor (SFT) is a mesenchymal fibroblastic tumor inside the pleura, for which complete surgical resection is the standard treatment. For large SFTs, preoperative identification of tumor-feeding vessels using angiography is important for achieving complete resection without unexpected operative bleeding. Extensive adhesions can make resection difficult in a limited operative window, and pulmonary resection may be required to achieve complete SFT resection. Herein, we report successful resection of a large pleural SFT in a 39-year-old man without any complications using a 2-stage approach, in which ligation of the feeding vessels through small another operative window was the first step.

• 한국압력기기공학회 논문집
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• 제19권2호
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• pp.75-83
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• 2023

For three-dimensional finite element welding residual stress simulation, several methods are available. Two widely used methods are the moving heat source model using heat flux and the temperature boundary condition model using the temperature profile of the welded beads. However, each model has pros and cons in terms of calculation times and difficulties in determining welding parameters. In this paper, a new method using the moving temperature profile model is proposed to perform efficiently 3-D FE welding residual stress analysis for large structures. Comparison with existing experimental residual stress measurement data of two-pass welding pipe and SNL(Sandia National Laboratories) mock-up canister shows the accuracy and efficiency of the proposed method.