• Journal of Navigation and Port Research
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• v.35 no.1
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• pp.93-100
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• 2011

This dissertation analysed actuality and literatures aimed at optimizing added value of Busan Port. As far as the literatures are concerned, the limits and the direction to go of Busan Port have been reached through analysing and comparing Busan Port, Antwerp Port, and Rotterdam Port by their each function. While Rotterdam and Antwerp Port are each functioning as an integrated port disposing container freight, general freight and liquid cargo, the container of Busan port contributes over 88 percent of its cargo and the function of the others like bulk is scattered to Ulsan, Masan, and Jinjae Port. Hereby, Busan Port needs to develop its function so as not to duplicate its function with the others in Korea and add value of theirs each. As a result of the local experts about analysing actuality, it turn out that it is similar with the literatures. In macroscopic view, specialization mainly with container, general cargo disposal ability enforcement and etc. are the most important. In microscopic view, rear complex of container tier and the supply base of liquid energy.

• Journal of Ocean Engineering and Technology
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• v.8 no.2
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• pp.93-104
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• 1994

Recently in the design of super tankers or LNG carriers which transport a large amount of liquid in the cargo holds, the structural damage due to liquid sloshing becomes an important problem. The impact pressure from sloshing is most violent when the liquid motion of a partially filled tank is in resonance with the motion of a ship. In this paper the sloshing natural periods in liquid cargo tanks are estimated for partially filled tanks with various geometries. Especially the sloshing periods of baffled tanks which are often installed to reduce liquid motion and sloshing forces are calculated. A variational method is adopted to analyze the baffled tank of arbitrary filling depth of liquid. In this approach the liquid domain is divided into several subdomains in which the analytic solutions are potential energy are calculated from the velocity potentials in eachsubdomain. By minimizing the Hamilton's functional, the sloshing natural periods are estimated and the results are compared with experimental and numerical results.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.331-334
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• 2020

항만에서 액체화물 취급이 증가함에 따라 로딩암의 사용빈도가 늘어나고 있다. 이에 본 논문에서는 로딩암 교육생들이 실전에 투입되기 전에 충분히 교육할 수 있도록 교육용 시뮬레이션을 제시한다. 그와 더불어 시뮬레이션과 연동되는 로딩암모형의 디지털트윈 연동을 통해, 교육생들의 로딩암 조종기술 향상을 이루어, 보다 안전한 로딩암작업과 항만의 액체화물사고 빈도를 크게 줄일 것으로 기대한다.

• Journal of Korea Ship Safrty Technology Authority
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• no.7 s.25
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• pp.94-107
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• 2008

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.7
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• pp.544-551
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• 2014

A program of launch vehicle performance analysis is composed for the education of the conceptual design of launch vehicles and the requirement analysis for the propulsion system design. The program is applied for the mission analysis of space launch vehicles based on KSLV-II with liquid rocket boosters. The 75-ton class liquid rocket engine is assumed for the boosters by referring the mass ratio of KSLV-II second stage. The launch performance analysis is carried out for KSLV-II with 2, 3 and 4 boosters by targeting the circular orbit of 700 km altitude. The trajectory is assumed as two-dimension considering the variation of the flight environment. Payload of advanced KSLV-II could be increased to maximum 3 tons, though it is limited by the thrust performance of the upper stage.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.05a
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• pp.268-269
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• 2018

울산항은 국내 최대의 액체화물 거점항만으로 지속적인 물동량 증가에도 불구하고 다른 무역항에 비해 정박지가 협소하고 날씨의 영향으로 해양사고 발생 개연성이 매우 높은 실정이다. 울산항의 지형학적인 특성과 선박 교통량을 고려하여 울산항 정박지의 전반적인 실태를 분석하고, 정박지 투묘 선박의 안전성 확보를 위해 효율적인 정박지 운영 및 개선방안을 제시하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.213-213
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• 2022

본 논문은 슬로싱(Sloshing) 거동에 놓인 극저온 액체수소 화물창의 BOG 예측을 위한 CFD 해석 절차를 다루고 있다. 특히, 적재율(Filling Ratio)에 따라 달라지는 열 유입과 그에 따른 액체수소의 기화 경향을 파악하기 위한 목적으로 수행되었다. 액체수소와 기체수소의 혼재에 의한 다상 열유동(Multiphase-Thermal flow) 특성을 반영하고 유동에 따른 강제 대류 현상을 열유속에 반영하기 위한 CFD 해석을 수행하였다. 다상 유동 모델의 정확성을 검증하기 위하여 슬로싱 실험의 압력 계측 값과 해석의 압력 값 및 자유수면(Free surface) 형상을 비교하였다. 소형 C-Type 독립형 액화수소 탱크를 대상으로 슬로싱 유동과 BOG 발생을 수치적으로 예측하였다. 해석 과정에서 VOF(Volume of fraction) 모델과 Eulerian 모델을 모두 적용하여, 액체수소에 유입되는 열 유속(Heat flux)의 예측 정확성을 비교하였다. 슬로싱 유무에 따라 액체수소에 유입되는 열 유속을 비교하여 슬로싱 유동의 포함 여부에 따른 BOG 발생량의 변화를 제시하였으며, 최종적으로 액체수소의 충전율(Filling ratio) 별로 BOG 발생량의 경향성을 제시하였다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2012.05a
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• pp.300-303
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• 2012

Global warming has been a serious problem due to excessive emissions of carbon dioxide from the increase of energy consumption. The present study investigates an energy generation mechanism that does not produce carbon dioxide and oxides of nitrogen. A reaction mechanism including sodium borohydride and hydrogen peroxide has been introduced and as a result, thermal energy can be generated from combustion of hydrogen with oxygen. Sodium borohydride dissolved in water reacting with liquid hydrogen peroxide may reveal maximum adiabatic reaction temperature of 1795 K at a mixture ratio of 0.89.

• Journal of the KSME
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• v.56 no.10
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• pp.38-43
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• 2016

고체연료인 석탄을 사용하기 편리한 기체나 액체연료로 변환하는 석탄가스화 기술은 1900년도 초 독일에서 필요한 연료의 많은 부분을 석탄을 이용해 사용했던 기술이며, 최근 석탄사용으로 인한 먼지, 황산화물 등 발생에 대해 상대적으로 친환경 설비인 IGCC 발전설비에 대해 소개하고자 한다.

• Applied Chemistry for Engineering
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• v.21 no.2
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• pp.129-136
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• 2010

Ionic liquids are expanding their applications in various fields of chemistry, due to their unique properties such as negligible volatility, immisciblity with hydrocarbons, high electrical conductivity, and tunable acidity and basicity. In this paper, the physical properties, synthesis, and commercial applications of ionic liquids are discussed. Recent research trends are also briefly reviewed, particularly on application of ionic liquids to catalysis, biomass, and $CO_{2}$ capture and utilization.