• Proceedings of the KSME Conference
• /
• 2007.05b
• /
• pp.3110-3115
• /
• 2007

The effect of Lorentz force(Electromagnetic force) on the liquid metal flow has been investigated. The flow velocity has been calculated by treating the Lorentz force as a source term in the Navier-Stokes equation. The liquid metal flow in the rectangular duct of an electromagnetic pump was analyzed with the Lorentz force varied.

• International Commerce and Information Review
• /
• v.1 no.2
• /
• pp.365-379
• /
• 1999

본 연구에서는 인터넷 무역의 특징, 기존 무역절차와의 차이, 인터넷 무역의 주요 수단, 성공요건 등을 살펴보고 인터넷 무역과 관련된 정부부처, 무역유관기관, 학계, 언론, 정보통신업체 등의 역할과 추이, 국내 수출기업의 인터넷 무역 활용 등을 검토하였다. 이러한 검토를 통해 법적, 제도적 뒷받침, 인프라 구축, 거래알선 서비스 및 무역정보 제공뿐만 아니라 인터넷 무역 전문인력의 육성을 포함하여 기업의 현실을 감안한 현장 밀착형 지원체제의 구축이 필요하다는 것을 알 수 있었다. 이와 관련하여 대학 등 교육기관의 역할이 매우 중요함을 강조하고, 향후 대학 등이 중심이 되어 중앙정부와 지방자치단체, 무역유관기관, 종합상사, 언론기관 등과 긴밀한 산 학 관 협력체제를 구축함으로써 지역 중소기업의 발전과 대학생들의 취업이나 창업에 기여할 수 있음을 살펴보았다.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2004.05a
• /
• pp.568-571
• /
• 2004

본 논문의 목적은 벤처캐피탈(Venture Capitalist)의 투자전략을 게임이론을 통해 분석하고 이해하자는 것이다. 벤처캐피탈은 성장가능성은 높지만 불확실한 벤처기업에 투자하는 전문투자자이다. 벤처캐피탈은 이익을 극대화하기 위해서 성장가능성이 크고 위험관리가 가능한 기업에 투자를 하여야 한다. 하지만, 벤처캐피탈은 일반적으로 제한된 시간과 벤처기업의 속성 때문에 기업에 대한 정보가 부족한 상태에서 투자결정을 내려야 하는 경우가 대부분이다. 투자가 이루어진 후 벤처캐피탈은 벤처기업의 운영 및 기업활동을 감시(Monitor)하고 자문활동(Consulting Activity)을 수행하면서 차츰 기업에 대한 정보를 습득하게 되고 기업의 가치를 판단할 수 있게 된다. 본 논문은 앞에서 기술한 바와 같은 정보 불확실성 상태에서 창업자의 효용(utility)와 벤처캐피탈의 가치평가(value evaluation)를 바탕으로 벤처캐피탈의 투자전략을 게임이론을 통해 분석하였다. 본 논문은 벤처캐피탈이 전환사채형태의 투자를 하는 논거를 밝혀내었다.

• Proceedings of the KIEE Conference
• /
• 2006.10d
• /
• pp.74-76
• /
• 2006

This paper presents the experiment and characteristics analysis of electromagnetic pump using linear induction motor(LIM). The electromagnetic pump is used to transfer the molten metals by electromagnetic force of LIM. The characteristics of LIM pump for molten metals: zinc, tin, aluminum are analysed solving the magnetohydrodynamics at constant magnetic flux. The molten zinc is used in the experiment and the experimental results are compared with the analysis.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.58 no.7
• /
• pp.1329-1335
• /
• 2009

This paper presents the flow characteristics in the fluid circulation loop using the tubular type linear induction motor(TLIM) electromagnetic pump. A TLIM pump was designed using the equivalent and genetic algorithm for the flow system of 40[1/min]. The flow characteristics are analyzed by coupling the Maxwell equations with the Navier-Stokes equation. The analysis algorithm also takes account of the effects of the thrust. The flow characteristics are analysed with the proposed method and compared with the commercial program and experiment and discussed.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.25 no.4
• /
• pp.111-116
• /
• 2011

This paper deals with the electromagnetic clutch which stop the generator at emergency by using the engine power of generator. The electromagnetic field was analyzed using Flux-2d program with different conditions : voltage, air gap, coil locations. As a result, the maximum magnetic flux density of electromagnetic clutch occurred between the coil and wheel : 0.27[T], 0.41[T] at 12[V], 24[V]. The maximum flux density was at the center location of the coil.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.24 no.12
• /
• pp.171-176
• /
• 2010

This paper presents the electric field for 22.9[kV]/380[V], 2[MVA] mold transformer are analysed using FEM(finite element method). The electric field was calculated for the voltage applied to the transformer. Then, it is analysed that the maximum electric field occurred between high voltage turns. Capacitance is calculated with energy method. Surge impulse test simulation is studied by modeling circuit with capacitance and inductance. This paper obtain the result that is about influence of electric field in distribution mold transformer adopted.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.840_841
• /
• 2009

본 논문은 2차원 유한요소법을 이용하여 2[MVA]급 몰드변압기의 과도전계를 해석한 것이다. 과도현상을 해석하기 위해 변압기 코일 및 대지 간 정전용량을 에너지법을 이용하여 구하였고, 이를 이용하여 변압기에 충격전압 95[kV]가 인가될 경우에 변압기 위치별 전계의 세기를 구하였다.

• Proceedings of the KIEE Conference
• /
• 2007.04c
• /
• pp.141-143
• /
• 2007

This paper presents the MHD characteristics of the liquid metal flow. The electromagnetic force was calculated by the equivalent circuit method. This Lorentz force was used as a source term for the fluid flow equations. The modified Navier-Stokes equation was solved to give the velocity distributions of the liquid metal flow.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.25 no.1
• /
• pp.107-112
• /
• 2011

In this paper, the optimum design of the glass net shape was studied to minimize the electric field of mold transformer. The glass net is used for reinforcement in structure between coils and epoxy, but it can cause to increase the electric field and the partial discharge. Therefore, the optimum design of glass net is required to minimize the electric field. In this paper, the objective function was approximated by using response surface method and then Zoom-in method was used for optimal design to minimize the electric field. The electric field was analysed using finite element method for each shape of glass nets.