• 전기학회논문지
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• 제64권6호
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• pp.857-863
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• 2015

OF cable with excellent reliability and economic efficiency, has been used as the main cable of underground transmission in Korea. However, as XLPE cable is excellent in view points such as reduction of loss, convenience on the construction/operation, and manufacturing technology, it has been replaced as instead of OF cable. Also, when the aging occurs in some sections of OF cable, the section is replaced as XLPE cable without changing of whole cable line. However, there are some differences like electrical constants between both types of cables. Therefore if underground transmission system will be operated as combined connection composited of both cables, it should be proved that overvoltage is stable in steady and transient state. This paper describes the effectiveness of connection operation in combined OF and XLPE cable. For the evaluation of effectiveness, some important analysis such as sheath component voltage, lightning and switching overvoltage, single line-to-ground fault are carried out in steady and transient state. EMTP/ATPDraw is used for modeling and analysis of system.

• 한국산업정보학회논문지
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• 제17권7호
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• pp.119-125
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• 2012

본 논문은 변전소 내에서 취득된 데이터만을 이용하여 전계통 전압안정도를 확보하기 위한 실시간 변전소내 OLTC(On-Load Tap Changer)와 S.S(Switched Shunt)와의 협조제어 알고리즘을 제안하고자 한다. 전압레벨을 일정한 값으로 유지시키기 위해서 동작하는 OLTC의 제어를 잘못하게 된다면 오히려 계통의 안정도(전압안정도) 를 해치는 결과를 나타낼 수 있다. 이 논문에서는 단일 변전소에서 취득된 데이터만으로 전체 시스템의 상태를 판단할 수 있는 Z-index를 이용하였다. Z-index를 이용하여 시스템을 normal 상태와 abnormal 상태로 구분하였고, 각 상태에 따른 협조제어 알고리즘을 제안하였다. 알고리즘 검증을 위해서 Hypersim과 matlab simulink를 이용하였다.

• 산업기술연구
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• 제28권B호
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• pp.111-116
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• 2008

Since the hydraulic fracturing field testing method was introduced first to Korean geotechnical engineers in 1994, there have been lots of progresses in a hardware system as well as an interpretation tool. The hydrofracturing system of first generation was the pipe-line type, and it has been developed to a wire-line system at their second generation. The current up-to-date system is more compact and is able to be operated by all-in-one system. With a progress in a hardware system, the software for analyzing in-situ stress regime has also been progressed. The shut-in pressure, which is the most ambiguous parameter to be obtained from hydrofracturing pressure curves, can now be acquired automatically from the various methods. While the hardware and software for hydrofracturing tests are being developed during the last decade, the author could accumulate the field test results which can cover the almost whole area of South Korea. Currently these field data are used widely in a feasibility study or a preliminary design step for tunnel construction in Korea. Regarding the difficulties in a site selection and a test performance for the in-situ stress measurement at an off-shore area, the in-situ stress regime obtained from the field experiences in the land area can be used indirectly for the design of a sub-sea tunnel. From the hydrofracturing stress measurements, the trend of magnitude and direction of in-situ stress field was shown identically with the geological information in Korea.

• Korean Chemical Engineering Research
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• 제46권3호
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• pp.598-603
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• 2008

석유화학산업단지의 수소 네트워크 최적화는 석유화학산업 단지 내 각 업체 간 잉여 수소와 필요 수소의 양과 순도를 조사하여 최적의 분배를 구해는 것이다. 본 논문에서는 새로운 네트워크를 구성할 때 기존의 파이프라인을 고려한다면 비용을 줄일 수 있는 효과를 정량적으로 명확하게 알아보기 위해 가상의 수소 네트워크를 구성하여 기존의 파이프라인을 활용하는 것과 활용하지 않는 두 가지의 case를 모델링하고 수리계획법을 사용하여 계산, 비교해 보았다. 그 결과 기존의 파이프라인을 활용한다면 가정된 조건 하 에서 파이프비용을 20%이상 줄이고 전체네트워크 이익을 약 14억 원 증가시키는 결과를 얻을 수 있었다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.1110-1119
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• 2006

If water flows through a narrow passage into a medium that keeps the equilibrium of temperature, it causes small temperature difference and makes a temperature anomaly. The seepage or leakage often observed at old dams is a representative example of bringing about a temperature anomaly. Therefore, temperature measurements have been regarded as one of excellent methods that can detect the situation of seepage or leakage. However, because existing temperature measurement methods are based on a single sensor, the application of the method to the whole structure is nearly not possible in technical and economical phases. This paper introduces a temperature monitoring system using a thermal sensor cable that is comprised of addressable thermal sensors connected in parallel at many positions within a single cable. Through various laboratory and field experiments, it has been proved that the temperature monitoring technique can give an useful information about permeability of a medium or connectivity of fractures which have been regarded as difficult problems.

• 한국조리학회지
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• 제9권3호
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• pp.197-211
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• 2003

It is widely agreed that customers' purchase are strongly influenced by their emotions. despite the obvious importance of eliciting positive emotional responses from customers, we find no record that family restaurants have ever measured or used customers' emotions as a management tool. This study aimed to verify the importance of the customers' emotion in the relational performance of family restaurant business. In order to achieve the object of the study, the effect of emotional factors on service satisfaction, revisit, word-of-mouth were analysed. The data were collected from 450 customers who had visited five family restaurants in Seoul more than once during the last three months from September 20 to October 5, 2002. Emotional variables in service experience process were grouped as three factors; in the middle of having food, in entering and leaving restaurant and in the waiting line. It is proved that customers had different emotions in each process of family restaurant service experience. Multiple regression analysis was employed to explore the influence of three emotional factors on relational performances such as satisfaction, revisit and word-of-mouth. It was found that customers were influenced by emotional factors in entering and leaving restaurant, secondly influenced in the waiting line and least influenced in the middle of having food. Finally, the findings indicated that customers' emotional factors in whole service experience process from entering to leaving the restaurant should be successfully cared by service staff. Future research is recommended to find out which specific emotional factors affected on relational performance of family restaurant.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국제학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.885-890
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• 1988

This is a successive study of the development and application of an electronic safeguard system for elderly men (senile dementia patients) who wander without purpose because of declined mental capability, while retaining their physical ability. The new safeguard system is designed with some additional functions on the basis of the previously developed system. Firstly, alarms are designed not to disturb other patients at night, so that informations about doors from which the patients go out may be transmitted to helpers individually by radio paging system. Secondly, the system hardware can be set up anywhere without laying particular signal transmission cables, provided that there exist AC power distribution lines for the utilization as a transmission line of signals to alarm indicators. Thirdly, it is possible to have a grasp of the whole states of the safeguard systems at the center of operation by monitoring the operational state of each system with a necessary data acquisition according to its instruction through telecommunication network. Thus, each safeguard system can be economically supplied to the special nursing homes and the helpers are ensured more released from physical and psychological burdens so that they can devote themselves to the care of senile elderly men, thereby improving their patients' comfort and human dignity.

• 복식
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• 제54권7호
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• pp.27-40
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• 2004

The purpose of this paper is to make it easy to reproduce the Pattern and sewing technique of men's coat in 18th century. which are modified in order to be made readily available in Korean theatre costume. The investigation was performed in three steps. 1st, The papers and records about development and change of men's coats were reviewed. End; The whole process of the way how to make a typical 18th century men's coats were sewn. 3rd ; The modification or revision into the more simplified pattern using by CAD system and sewing technique were suggested in detail. The size of the pattern in the original one, which we chose for this research, was generally small. with the side line being moved back a little. Moreover, arm movements were severely restricted because of the small arm-hole. The problems of original pattern were corrected by making both front and back pattern snug and side line being moved to the front, and making arm-hole wider. In the sewing technique, the simple way how to use of Padding, inter-linings and linings and to create the most noticeable figure of 18th century men's coat. This article may help theatre costume production in Korean performing art.

• 한국문헌정보학회지
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• 제36권2호
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• pp.185-207
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• 2002

납본제도는 모든 국가도서관의 자료수집 및 보존기능에 가장 중요한 법적 수단의 하나이다. 그런데 기존의 인쇄자료에 기반한 납본제도로는 전자출판물의 망라적 납본수집이 어렵기 때문에 최근에 상당수의 국가에서 납본법령을 개정하였거나 준비 중에 있다. 이에 본 연구는 법령체계, 납본주체와 피납본기관, 대상 자료의 범주, 납본의 부수와 시한, 납본자료의 매체변형, 보상과 제재 등을 중심으로 국내외 전자출판물의 납본제도를 분석하고자 한다. 그리고 연구의 결과는 후속 과제인 국내 납본제도 개선모형의 이론적 기초로 삼을 것이다.

• 약학회지
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• 제48권2호
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• pp.153-158
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• 2004

Paecilomyces tenuipes is one of the famous Chinese medicinal entomopathogenic fungi that parasite in the lavae of silkworm. A cytotoxic compound, 4$\beta$-acetoxyscirpendiol (ASD) was isolated from a methanolic extracts of Paecilomyces tenuipes. The ASD compound belongs to scirpenol subfamily of trichothecene mycotoxin. In a continuation of the elucidation of the mechanism of ASD, we report here the evidences of induction of apoptosis by ASD in human Jurkat T cell line. In MTT reduction assay for monitoring cell viability, ASD showed strong toxicity. The 50 percent inhibitory concentrations of ASD against human T lymphoid Jurkat cell was 59.5 ng/$m\ell$. Phosphatidylserine externalization was increased by ASD at 3 and 6 hrs when compared with that of 6 hrs in the cell line showing in a time-dependent manner. When whole lysates of cells treated with ASD were subjected to western blot assay, 113 kDa poly(ADP-ribose) polymerase (PARP) was significantly cleaved to 89 kDa fragment. Time-dependent DNA fragmentation was also observed when Jurkat T cells were treated with ASD at 100 ng/$m\ell$ for 6 hrs and 18 hrs at the ratios of 8.5% and 15.0%, respectively. From these data, Jurkat T lymphocytes treated with ASD from Paecilomyces tenuipes underwent typical cascades of apoptotic cell death.