• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.587-589
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• 2003

국내 전력 산업은 과거 수직통합적 독점구조에서 부문별 기능분할 및 경쟁도입을 점진적으로 추진하고 있으며 먼저 발전회사간 경쟁을 도입하기 위하여 한국전력의 발전부문을 6개의 발전회사로 분할 하였다. 2004년부터는 본격적으로 양방향 도매전력시장을 도입하여 운영할 계획에 있다. 도매전력시장의 도입으로 발생할 수 있는 가장 큰 시장 위험요소로는 시장가격의 수준 및 변동성에 대한 불확실성을 들 수 있다. 이는 시장참여자 모두에게 위험요소가 될 수 있으며 이를 위하여 정부주도하에 경쟁시장 이행기 동안의 과도기적 위험관리 도구를 제공하게 되며 발전회사와 판매회사 사이의 강제적 계약인 베스팅 계약이 포함될 것으로 예상된다. 여러가지의 베스팅 계약 중에서 Two-way 베스팅 계약은 발전회사와 판매회사와의 계약량, 계약가격을 정부 또는 관련기관에서 지정하는 것으로 이러한 Two-way 베스팅 계약은 도매전력시장의 초기에 발전회사의 손실을 최소화하는 역할을 할 것으로 예상되지만 반대로 수익을 제한하는 요소로도 작용할 수 있다. 따라서 본 연구에서는 베스팅 계약 중에서 Two-way 베스팅 계약에 대한 분석을 수행하고 이를 토대로 하여 베스팅 계약 하에서 발전회사의 수익을 최적화 할 수 있는 전략에 대한 연구를 수행하였다.

• 디지털융복합연구
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• 제11권5호
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• pp.211-223
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• 2013

오늘날 급변하는 경영환경 속에서 미래에 대한 불확실성이 증대됨에 따라 기업이 시장 환경에 대응하고 함께 번영하여 '계속적 기업(Going concern)'으로 살아남기 위해서 '핵심가치'가 부각되고 있다. 기업의 핵심 가치는 '조직의 미션이나 비전을 성취하는데 도움을 줄 수 있는 행동 방식에 대한 것으로 핵심가치가 대두되게 된 배경은 "윤리점검"과 "사업적 목표 달성"이다. 이러한 핵심가치는 기업이념 속에서 쉽게 찾아 볼 수 있다. 기업이념이란 회사를 어떤 목적에서 또 어떤 방식으로 경영해 나갈 것인가에 대한 기본적 생각, 사상을 표현한 것으로 경영자가 스스로 기업 경영에 대해 사회적으로 공표한 견해로 최근 많은 국내 글로벌 기업들이 핵심가치에 기반을 둔 기업이념을 선포하였다 이에 국내 대기업인 L- 그룹의 사례인 L- Way를 통해 핵심가치가 기업이 지속가능한 경영에 미치는 역할과 중요성에 대해 알아보기 위한 연구이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.806-808
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• 2004

The series and parallel connection is essential for increasing power ratings of resistive type for fault current limiters. To increase voltage class, components are connected in series and to increase current level to the nominal value, they are connected in parallel. There are two ways to connect components in series and parallel. First, connected in series and then the module connects to the parallel. Second, connected in parallel and the module connects to the series. We have studied for the two ways. In this paper, we particularly investigated way to connect components in parallel first This way has the advantage of inducing effective simultaneous quench without any other devices, for example, the thing which is inducing magnetic field to the limiting and shunt resistors. And also we studied for the endurance of component which is patterned to the bi-spiral for prospective fault current. It is very important to understand this, because SFCL will use as the only device to decrease burden of circuit breaker. As experimental results, limiting component patterned to bi-spiral endures fault current up to 30kA and it works well, in parallel to series connection,

• Korea Journal of Cosmetic Science
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• 제2권1호
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• pp.33-46
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• 2020

Cosmetics are representative complex fluids, and there have been many studies focusing on the correlation between the rheological properties and sensory attributes. Various instrumental measurements have been suggested to evaluate the sensory attributes, and one of the most common instruments is Texture Analyzer (TA). Although it is reported that the adhesiveness measured by TA is related to the stickiness of cosmetics, there exists reproducibility problem because measurements with TA are sensitive to application conditions. In this study, an instrumental protocol using rotational rheometer has been set up to measure the stickiness of cosmetics. This protocol consists of two steps. The first step is a preconditioning step, and various types of shear deformations are applied to the samples. The next step is the extensional flow and the axial force is measured. When the amplitude of the shear flow corresponded to the linear viscoelastic region, the axial force is the same as those without preconditioning. On the other hand, an axial force decreases as variation nonlinearity increases. It is because the effects of microstructure changes caused by nonlinear deformation affects the extensional flow. It is worth noting that a new protocol facilitates to evaluate the stickiness of cosmetics in a more systematic way.

• 설비공학논문집
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• 제17권1호
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• pp.56-61
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• 2005

Indoor air quality becomes of a concern recently in view of human health. This study investigates the air diffusion performance and the air change efficiency of a classroom, when outdoor air is introduced in addition to the heating/cooling operation of a ceiling-mounted heat pump. A CFD analysis has been performed to investigate the effect of the discharge angle of the air jets from the heat pump for both parallel and series types of outdoor air system. It is observed that the series type creates more uniform indoor environment compared to the parallel type in general. It can be concluded the discharge angle should not be larger than 40o for the parallel type, in order not to generate thermal stratification in the room.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.553-556
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• 2000

This paper suggests the way to perform the handover by predicting the movement route of the mobile terminal by considering the movement pattern of the user. By considering the fact that the most users has the constant movement pattern, the channels needed fur the handover can be reserved, and the required quality of service (QoS) is maintained during handover. The suggested algorithm makes the channel allocation schemes more efficient.

• 한국레이저가공학회지
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• 제15권1호
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• pp.6-9
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• 2012

In TFT-LCD manufacturing process, various defects are generated by manufacturing machine trouble or particle. These defects can be repaired through the TFT-Laser repair process that only can't be automated in TFT-LCD manufacturing Process. In this Paper, we propose auto defect algorithm for TFT-LCD laser repair machine using image processing algorithm in order to automate process. Proposed algorithm can detect very small defects (< 2um) in 98% success ratio, and generated laser repair path guarantee highly precise position accuracy. Through proposed system, much of the work still done the old-fashioned way, by hand, can be automated and manufacturing company can be strengthed the competitiveness of cost.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 C
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• pp.896-898
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• 1998

Recent development of the digital computer and communication technology has made the concept of the adaptive protection possible, which is to adapt the operating parameters of the protective devices to the system changes, so that the best protection function can be maintained all the time. In order to achieve the adaptive protection, it is necessary to have the way to determine whether the change of the settings is needed under the certain system change or how good the current protection level is. This paper proposed the protectability index, which is a way to evaluate the protection level of the system under arbitary conditions and the operating strategy of the adaptive protection utilizing this index. It is based on an hierachical evaluation model and the evidence combination rule of the Dempster-Shafer theory.

• 한국기계가공학회지
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• 제17권6호
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• pp.98-104
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• 2018

Deflected 4-way panels of ceiling air conditioners produced by injection molding process have caused dew condensation at the edge of products. In order to prevent this drawback with reducing weight and deformation, this study proposed renovated process adopting microcellular foaming. According to results from 2-sample t-test and analysis of variance(ANOVA), the critical factors affecting weight were melt temperature and injection speed. In addition, the vital effects on deformation were structure at the edge, mold temperature and cooling time. Optimal conditions of these parameters were derived by regressive analysis with CAE and response surface method(RSM), and then applied to an actual design and process stage to analyze performance. As a results, it clearly showed that new process improved process capability as well as reduced both weight and deformation by 18.8% and 71.9% respectively compared to the conventional method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기물성,응용부문
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• pp.102-105
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• 2002

ADSS(All Dielectirc Self-Supporting) cable installed under high voltage power cable line suffers a variety of environmental influence, rain, wind, snow fall, chemical pollution, salt fog and electrical stress. Its lifetime is required to be at least 20 years with this harsh weathering condition. The electrical stress under high voltage power line gives rise to dry band arcing and tracking, the severest damage, on the outer sheath of cable. Finally tracking might penetrate sheath and cause the break-down of ADSS cable. Tracking resistant sheath material, therefore, should be used to protect the core of ADSS from dry band arcing and to be sure long lifetime. In this work, we discuss various commercial tracking resistant material to investigate the way of track resistance and compare their mechanical, electrical, weathering and tracking properties through serial experiments. We found track resistant material is categorized into two main type : polyethylene with metal hydroxide and polyethylene with reduced carbon black. The Liquid contaminant, Inclined plane Tracking and Erosion test says the time to track of tracking resistant material with metal hydroxide has a little longer time to track in the high applied voltage than that with carbon black, but mechanical and weathering properties were inferior to.