• International Commerce and Information Review
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• v.8 no.4
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• pp.277-300
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• 2006

In the initial stage of a national economic development of China, the family business takes enterprise's organizational form ruling position. The private enterprise of China is mainly family business; the family makes the mainly proprietorship in other words. Even in the private enterprise after developing, 70 percents are managed as a family This paper start to study the Transferring Power Patterns in family business using the Company's Life Circle Theory and some other correlative theories. Based on the Transporting Power Model, the paper gives a comprehensive explanation for the choice of transferring power pattern in the family business of China.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.35 no.6
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• pp.217-225
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• 1986

This paper describes the Optimal PWM strategy to reduce a pulsating harmonic torque for a variable-speed drive of 3 phase induction motor. This paper suggests the new Optimal control theory which consists of 1) defining a performance index related to the unwanted effects of the voltage harmonics, (i.e., the components of pulsating harmonic torques) 2) achieving its minimization by a suitable choice of the switching patterns. (i.e., of the commutation angles) This PWM strategy is compared with the conventional SPWM strategy by numerical method. It is believed that this proposed strategy can reduce more harmonic components and pulsating harmonic torques than SPWM strategy. Also, We could verify the validety of the numerical method by a result of simulation analysis of a variable speed 3phase induction motor.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.52 no.6
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• pp.333-339
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• 2003

Competition among electric generation companies is a major goal of restructuring in the electricity industry. In electricity market, a huge volume of commodities will be traded through competitive bidding. The choice between uniform and pay-as-bid pricing for electricity auction has been one of most important issues in deregulated electricity market. This paper proposes a constrained Bertrand model for analyzing the electricity auction market of price competition model. The issue of the two pricing rules of uniform and pay-as-bid is studied from the viewpoint of consumer's benefit. This paper also shows that transmission congestion depends on the pricing mechanism. Pay-as-bid pricing gives less possibility of transmission congestion by price competition, and less burden to consumers in the simulation results.

• Journal of Ocean Engineering and Technology
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• v.12 no.2 s.28
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• pp.43-56
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• 1998

A barge-type structure has been recently watched since The Floating Structures Association of Japan proposed the new concept as the most suitable one of floating airports. In this paper, the method, which is based on a combination of a three-dimensional source distribution method and the wave interaction theory is applied to very large floating structure of barge-type. The calculated results show good agreement with the experimental and calculated ones by Yago and remarkable characteristics concerning the hydroelastic behavior of the very large floating structure on the effects of hydrodynamic interactions and choice of body modelling.

• 제어로봇시스템학회:학술대회논문집
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• 1988.10a
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• pp.231-235
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• 1988

In this paper we present a new method to control system design using a sliding mode. The objective of this research is to develop the algorithm for the sliding mode control which is able to remove the chattering phenomena and to reduce the reaching phase. To accomplish this approach we introduce switching dynamics instead of switching logics to obtain the sliding mode. Consequently, we can obtain the new design approach which is much simpler than the VSS theory. And there do not exist chattering phenomena in this method because the obtained control input are continuous. Simultaneously we can reduce the reaching phase by a suitable choice of design factor. Numerical examples are discussed as illustration.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.971-974
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• 2002

Petri net is an effective modeling tool for concurrent systems. Liveness problem is one of analysis problems in Petri net theory verifying whether the system is free from any local deadlocks. It is well known that computational complexity of liveness problem of general Petri net is deterministic exponential space. Some subclasses, such as marked graph and free choice net, are suggested where liveness problem is verified in less complexity. This paper studies liveness of siphon containing circuit (SCC) net. Liveness condition based on algebraic inequalities is shown. Then polynomial time decidability of liveness of SCC net is derived, if the given net is known to be an SCC net a priori.

• Proceedings of the KSME Conference
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• 2002.08a
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• pp.91-94
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• 2002

It is important to develop new effective technologies for increasing the interruption capacity and reducing the size of a GCB (Gas Circuit Breaker). It is not easy to test the real GCB model in practice as in theory. Therefore, a simulation tool based on a CFD (Computational Fluid Dynamics) algorithm has been developed to facilitate an optimization of the interrupter. But the choice of grid is not at all trivial in the complicated geometries like a GCB. In this paper, we have applied a CFD-CAD integration using Cartesian cut-cell method, which is one of the grid generation techniques for dealing with complex and multi-component geometries.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.9
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• pp.796-803
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• 2008

Ultrasonic testing uses the directivity of the ultrasonic wave, which propagates in on direction. The directivity is expressed as the relationship between the propagate direction and its sound pressure. The directivity of an ultrasonic wave is related to the choice of probe arrangement, testing sensitivity and scanning pitch and correct measurement of defect size and location. This paper describes on the directivity measurement of ultrasonic wave using the visualization method. The directivity of shear wave emitted from the angle beam transducer were constant during propagation. The difference of directivity was existed between 2 MHz and 4 MHz angle beam transducers. When these experimental results were compared with the theory which was based on the continuous wave, it showed good agreement with theoretical directivity on the principal lobe.

• Bulletin of the Korean Chemical Society
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• v.32 no.12
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• pp.4195-4198
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• 2011

Intramolecular ${\pi}-{\pi}$ and ${\sigma}-{\pi}$ interactions are omnipresent for numerous energetic and structural phenomena in nature, and the exact description of these nonbonding interactions plays an important role in the accurate prediction of the three-dimensional structures for numerous interesting molecular systems such as protein folding and polymer shaping. We have selected two prototype molecular systems for benchmarking calculations of intramolecular ${\pi}-{\pi}$ and ${\sigma}-{\pi}$ interactions. Accurately describing conformational energy of such systems requires highly elaborate but very expensive ab initio methods such as coupled cluster singles, doubles, and (triples) (CCSD(T)). Our calculations reveal a double hybrid density functional incorporating dispersion correction (B2PLYP-D) that agrees excellently with the CCSD(T) results, indicating that B2PLYP-D can serve as a practical method of choice.

• Journal of Fisheries and Marine Sciences Education
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• v.20 no.2
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• pp.201-208
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• 2008

진로상담에 대한 관심과 요구가 높다. 효과적인 진로상담을 위해서는 무엇보다도 나름대로의 이론적 틀을 가지는 것이 무엇보다도 중요하다. 다양한 진로문제를 다루기 위해서는 어느 한 이론보다 통합된 관점을 가지는 것이 중요하다. 이에 본 연구에서는 대표적인 진로이론 4가지 선정하여 각 이론의 독특성을 검토한 후 이를 기초로 하나의 통합된 관점을 제시하고자 하였다. 이를 위해 Holland의 유형론, Super의 자아개념발달이론, Krumboltz의 의사결정의 사회학습이론, Dawis와 Lofquist의 직업적응이론의 유사점과 차이점을 검토하였다. 검토 결과, 진로 이론은 진로 선택 및 발달의 영역에 따라 유용성에 있어 차이를 보였다. 다시 말하면, 어떤 이론이 다른 이론보다 진로 선택 및 발달의 특정 측면을 이해하고 설명하는 데 더 유용한 것으로 나타났다. 그러므로 각 이론의 독특성을 고려하여 기존의 이론들을 하나의 이론으로 통합하는 것이 가능하고 유용할 것이라는 결론을 얻었다. 이러한 분석 결과를 기초로 진로이론 통합의 한 가지 방안을 제시하였다.