• Journal of Advanced Marine Engineering and Technology
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• v.38 no.8
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• pp.961-967
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• 2014

In onshore and offshore plant engineering, a broad use of pipe system have been achieved and accordingly related technologies has been developed especially in the field of flow control valves. The aim of this study is to suggest the quadruple offset butterfly valve for bi-directional applications which show equivalent operating torque characteristics of the triple offset butterfly valve. Seat design parameters for the quadruple offset butterfly valve are determined by the proposed method utilizing both ANOVA (analysis of variance) and the orthogonal array. Through additive model considering the effect of design parameters on seating torque, mean estimation is performed and thus its optimization results are verified by design of experiment results. The insight obtained from the present study is beneficial for valve design engineers to develop reliable and integrated design of the quadruple offset butterfly valve.

• Journal of the Society of Naval Architects of Korea
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• v.50 no.2
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• pp.104-110
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• 2013

In this paper, the design procedure and results for 'Residual Life Prediction System Considering Corrosion and Coating' are explained, which is one module of 'Life-cycle Management System of Ship and Offshore Plant's' Operation. This 'Residual Life Prediction System' has two main functions; one is residual life prediction function based on probability processing using corrosion measurement data of ship's major structural members, and another is rust rate prediction function based on visual image processing of inspection photos. The analysis of system user requirements and functions are introduced, and the structure and environment of the developed system are explained.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.792-793
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• 2015

This paper present a general computation taking into account the slotting effect on the magnetic field due to permanent magnet in surface mounted permanent magnet machine. The analytical method is based on the solution of Laplace's and Poisson's equations (by the separation of variables technique) for each subdomain, i.e., magnets, air gap, and slots. The general solution is obtained using boundary and continuity conditions. The analytical results are in very good agreement with those obtained by the FEA, considering both amplitude and waveform.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.794-795
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• 2015

This paper deals with back-EMF characteristic comparison of Vertical and Halbach array double-sided linear generator with coreless type. On the basis of a magnetic vector potential and Maxwell's equations, governing equations are obtained, and magnetic modeling is predicting characteristic analysis by using the Fourier series expansion. And then, we obtained magnetic field solutions and calculated resistance, back-EMF constant. The analytical results used by 2-D cylindrical coordinate system. The analytical method used in this paper is confirmed by comparing with finite element analysis results.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.11a
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• pp.145-157
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• 2017

최근 해양플랜트 시장은 저유가의 영향 등으로 인해 신규 해양플랜트 발주가 거의 없는 불황상태에 직면해 있다. 해양플랜트산업은 자원개발 및 부품 기자재 산업 등 전후방 연관산업에 대한 파급효과 측면에서 중요한 의미가 있으며, 미래 성장동력 창출의 관점에서 경쟁력 강화 및 체질 개선이 시급한 문제로 떠오르고 있다. 이에 본 연구에서는 해양플랜트 산업 R&D 현황을 살펴보고, 전문가 설문조사를 통해 이슈를 도출한 후 국내 해양플랜트 산업의 활성화 방안을 R&D 관점에서 제언하고자 한다.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2001.05a
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• pp.83-86
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• 2001

This paper aims to make a feasibility study and to propose a master plan for the development of "integrated ocean energy utilization system", which utilizes various renewable ocean energies. Fossils energy, as the most important energy resources which are inevitable for the living and industrial development, becomes exhausted and its consumption creates serious environmental problem. It is important to utilize renewable ocean energy for a sustainable and environmentally friendly development. We survey the integrated utilization of ocean energy based on surveyed energy density distribution and propose concepts of integrated ocean energy utilization plant for both onshore and offshore system. The results of this study can support national effort for renewable energy development utilizing integrated ocean energy and refer as a guideline for the technical development of sustainable integrated ocean energy.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.10 no.1
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• pp.40-45
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• 2011

As increasing the importance of renewable energy recently, the scale of a wind power plant is increasing to the number of GW scale and specially, it is trend to move from onshore to offshore to use the higher quantity and quality of wind. Consequently to meet the trend, it is largely considered the importance of communication protocol to control and monitor remotely. But, because the communication protocol between the control center and a wind turbine has been independently developed by each wind turbine vendor, it is absence of the compatibility and extensibility when the heterogeneous wind turbines are installed in the wind farm. The IEC 61400-25 is the specifying standard for these problems in Europe. In this paper, we will show the state of these problems and present a new structure of communication based on the IEC 61400-25 to get the compatibility and extensibility between a control center and wind turbines.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.10a
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• pp.271-273
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• 2012

브라질은 최근 심해유전(Pre-Salt)개발 등 해양자원개발 등을 통해 신흥자원부국으로 각광받고 있다. 올 해 6월 국영석유기업인 페트로브라스가 '2012-2016 Business Plan'를 통해 향후 5년 간 E&P, 정제 및 운송 분야에 2,073억 달러를 투자한다고 밝히면서 향후 해양플랜트 및 OSV 수요가 커질 것으로 예상된다. 브라질이 우리나라 조선, 해운, 전문 인력 분야에서 협력대상으로 한국을 염두에 두고 있어 특히 OSV 건조 및 운영과 관련해 우리나라 기업의 진출 전략 수립이 필요하다. 이 글은 브라질 OSV 시장 현황 및 정부 정책, 그리고 우리나라 진출 전략을 크게 현지네트워크 강화를 통한 페트로브라스 공략, 로컬 콘텐츠 대응 전략 수립, OSV 운영에 특화된 전문인력 양성, 선사 조선소 기자재 업체 협력체계 구축, 정부 지원 확대 등으로 제시한다.

• Water for future
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• v.20 no.1
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• pp.63-72
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• 1987

This study describes a procedure of movable bed model tests and discusses the similitude with a view to state of the art. The prediction of littoral transport in the vicinity of coastal structure of nuclear power #9, 10 has been attempted. From the result of the present movable model study, it was found that the offshore breakwater is more excellent than the groyne and the rip-current barrier for the prevention against in take siltations and for the stability of investigated coastal structure of nuclear power plant.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.1043-1046
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• 2014

2011년 정부가 발표한 스마트 교육 추진 전략으로 인해 기존 전자칠판시스템의 활용도가 더 높아질 것으로 전망된다. 한편, 기존의 전자칠판시스템에서 자체적으로 제공하는 판서 소프트웨어들은 다양한 기능들을 제공하지만 실제 활용 빈도는 매우 낮으며 사용 방법이 복잡하기 때문에 사용자 관점에서 직관적인 인터페이스와 사용 방법이 복잡하지 않은 판서 소프트웨어가 더 요구된다. 본 논문에서는 현재 많은 관심을 끌고 있는 스마트 교육 환경에서 모든 강사들이 쉽게 사용할 수 있는 전자칠판시스템용 판서 프로그램을 개발하였다.