• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.4-4
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• 2017

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2021.11a
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• pp.13-13
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• 2021

최근 항만에서 기인한 대기오염물질에 대한 심각성이 고조되고 있다. 본 연구는 부산항 (북항, 감천항 및 다대포항)을 대상으로 6월 한달 간의 항내에서 발생하는 대기오염물질 배출량을 추정하였다. 신뢰성 있는 대기오염물질 배출량 추정을 위하여 AIS(Automatic Identification System) 데이터를 기반으로 한 계산 방신인 Bottom-up 추정 방식을 활용하였으며 연료소모총량과 연료소비의 결과로서 발생한 대기오염물질 총량을 함께 분석하였다. 또한, 추정 배기가스 량을 이용하여 부산항에서의 환경 비용을 계산하였다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.6
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• pp.1023-1035
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• 2022

In the current situation where clearly the ship officer is avoiding boarding, the purpose of this study is to investigate the satisfaction of onboard training in shipping companies during the COVID-19 situation and to suggest plans to improve onboard training. Furthermore, by improving satisfaction, students of maritime university can improve their career awareness as a ship officer in the future. The survey was conducted with the cadets of Mokpo Maritime University after completion of onboard training in shipping companies. The questionnaire contains seven factors: education administration, education contents, officer, facility, education ef ect, education satisfaction and career awareness. The survey analysis results indicated that the satisfaction with education administration and education effect was relatively low, and the satisfaction differed by gender and vessel type. In addition, hypothesis verification revealed that the education contents did not have a positive effect on education satisfaction and career awareness. Furthermore, a great correlation existed between education satisfaction and career awareness. We suggested that education and promotion must be improved before onboard training. In addition, the officer must be educated on the method to teach cadets and establish a training plan such that the officer can systematically guide the cadets with an educator mindset.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.374-376
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• 2022

항로표지 배치의 적합성 평가 및 검증에 활용하기 위해 기계학습 (Machine Learning)을 통해 대표항적선을 결정한다. 이 연구에서는 대표항적선과 항로표지와의 최근접 거리를 계산하고 시인가능 거리 및 거리율 등을 통해 항로표지의 배치 적합성을 평가하고 검증한다.

• Journal of the Society of Naval Architects of Korea
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• v.58 no.1
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• pp.49-57
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• 2021

In the production power transmitting of a floating production system like a wind offshore floating, the power cable should be connected from the surface system into the subsea system. The connection between the surface and the subsea system will make the power cable get a dynamic load like current and wave forces. Based on this condition, a dynamic power cable is required to endure external physical force and vibration in the long-term condition. It needs more requirements than static power cable for mechanical fatigue properties to prevent failures during operations in marine environments where the external and internal loads work continuously. As a process to verify, the durability test of dynamic power cables under the marine operation environment condition was carried out by using domestic technology development.

• Journal of the Korean institute of surface engineering
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• v.51 no.5
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• pp.291-296
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• 2018

In this study, we carried out an ultrasonic-chemical decontamination process with immersion type, reproduced in the laboratory. The corrosion damage characteristics, depending on kind of materials and ultrasonic process time, were investigated. Inconel 600, which showed lower corrosion potential and higher corrosion current density than that of STS 316, revealed severer corrosion damage and higher weight-loss rate than STS 316. Weight-loss rate of Inconel 600 increased with increasing ultrasonic process time. On the other hands, STS 316 presented a negligibly small corrosion damage, which was almost indistinguishable from visual observation. There was no effect of ultrasonic process time on the weight-loss rate of STS 316.

• Computational Structural Engineering
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• v.32 no.2
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• pp.11-18
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• 2019

• Journal of the Society of Naval Architects of Korea
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• v.60 no.4
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• pp.278-287
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• 2023

This study aims to analyze and evaluate the structural strength of a 53ft Liquefied Natural Gas (LNG) tank container according to International Organization for Standardization (ISO) 1496-3, amidst growing global demand for LNG transportation. The research was conducted in two main stages: structural analysis using Finite Element Analysis (FEA) under various load conditions, and structural strength tests following ISO 1496-3 test procedures. The structural analysis was performed considering different loading conditions to assess the structural safety of the tank container. Calculated stresses were compared with allowable stress under specified load conditions. The structural strength tests were conducted at Mokpo National University's Subsea Umbilical cable Riser Flowline R&D Center, which provided a suitable testing environment. The study found that calculated stresses met the allowable stress under specified load conditions, confirming the structural safety of the tank container. Additionally, the maximum deformation and permanent deformation satisfied the design criteria for all test cases, indicating the container's structural strength meets requirements. The research also contributed valuable data for future structural strength tests of similar products and facilitated the development of safe and efficient LNG transportation solutions by developing effective test procedures in accordance with ISO 1496-3 standards.

• Proceedings of the KIPE Conference
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• 2018.11a
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• pp.177-178
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• 2018

본 논문에서는 직렬형 Hot-Swap ESS(Energy Storage System)를 구성하는 전력 변환 시스템에서 전류 센서의 옵셋 오차가 제어 성능에 미치는 영향에 대해 살펴보았다. 양방향 DC-DC 컨버터와 DC-AC 인버터에서 전류 센서 옵셋 오차의 영향에 대해 분석하고, 컴퓨터 모의 시험을 진행하여 그 특성을 파악하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.159-160
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• 2022

산업안전관리에 관한 자격증은 현행 9개 법령에서 10종을 두고 있으며, 국가기술자격법에 따라서는 수십 종의 관련 자격을 두고 있으므로 이를 분석하여 「해사안전법」에 따른 선박안전관리사의 자격시험의 하나로 채택예정인 안전관리 과목의 범위를 제안하였다.