• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.99-100
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• 2006

지금까지 국내 디지털 보호계전기의 성능 검증은 동작치 특성 시험 등 정특성시험(steady-state performance) 검증 위주로 수행되어 왔으며, 신규개발 디지털 보호계전기 및 신규 도입 디지털 보호계전기에 대해서는 정특성 시험과 함께 시뮬레이터를 이용한 동특성 시험을 병행하여 왔다. 동특성 시험은 보호계전기에 내장된 계전요소들의 유기적인 성능을 검증할 수 있는 시험으로서 복수 개의 보호계전요소를 탑재하고 있는 디지털 보호계전기를 검증하기 위해서는 필수적인 성능검증 수단이다. 그러나 이러한 장점들과 편리함에도 불구하고 디지털 보호계전기의 성능검증에 사용되는 계통 모델이 실 계통을 정확하게 반영하지 못할 경우 검증 결과의 신뢰성을 보장하기가 어렵다. 본 논문에서는 154kV 송전선로 보호용 디지털 보호계전기의 성능 검증을 위한 기반 구축 과정 및 결과에 대해서 기술한다.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.216-217
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• 2006

This paper presents development of program for generator maintenance scheduling. The maintenance scheduling of generating units is a dynamic discrete combinatorial optimization problem with constraints to determine the optimal maintenance periods of each generating units for a given planning periods. The developed program is designed so as to provide the maintenance schedule satisfying the operating reserve margin levelization and the procurement of proper reliability. In order to verify the effectiveness of the developed program, the numerical study has been performed with the practical data in 2005.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.292-294
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• 2005

전력계통에 고장이 발생할 경우 dc성분이 많이 포함된 고장전류가 발생될 가능성이 높아진다. 이때, 고장이 발생 되었다가 dc성분이 소멸되면서 만들어낸 자속이 CT의 포화에 가장 큰 영향을 미치게 된다. 특히 발전소 구내에서 고장이 발생되면 dc성분이 많이 포함된 고장전류가 발생되어 CT가 포화하는 현상을 자주 볼 수 있다. 이로 인해 보호계전기에 유입되는 2차 전류가 왜곡되고 이로 인해 보호계전기가 오동작을 하게 된다. 본 논문에서는 대용량 발전소의 스위치야드 차단기 혹은 모선에서 발생한 고장으로 Unit 보호계전기가 오동작한 사례를 분석한 내용이다.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.453-455
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• 2005

디지털 보호계전기의 성능 검증은 정특성 성능 검증, 동특성 성능 검증, 내 환경 성능 검증으로 나누어진다. 이 중 동특성 성능 검증에 대한 중요성이 증가하고 있으나, 실시간 디지털 시뮬레이터에 대한 접근의 어려움으로 인해서 해당 기술의 보급이 용이하지 않았다. 전력연구원에서는 이러한 점을 해결하고 관련 기술의 보급을 위해서 디지털 보호계전기 동특성 성능 검증의 기반을 마련하였으며, 이 기반은 성능 검증을 위한 계통 모델과 성능 검증 절차서로 각각 구성되어 있다.

• 보존과학연구
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• s.21
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• pp.207-231
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• 2000

Examples for application of cultural properties using Infrared Reflectography System as method of investigation on mural paintings and letters are given. This work is carried out according to asking of examination on inner layer paintings and letters in order to conserve the mural paintings discovered in the course of repairing ancient architectures. It is difficult to find the inner layer paintings and fine decorative line, but we can be observed by using Infrared Reflectography System and thus these results can be used as original rebuilding and drawings of mural paintings. Also building-repairing year, building participant though the investigation of letters written on the roof wood can be known.

• Food Science and Preservation
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• v.7 no.2
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• pp.228-232
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• 2000

To utilize abundant potatoes effectively, it was studied on alcohol fermentation strains which were isolated and identified. Fifteen yeast strains with high alcohol fermentation ability were isolated from rotted potatoes. Among them, two isolated strains, 5-3A and 10-4B showing the highest alcohol fermentation ability were identified as Zygosaccharomyces fermentati based on the morphological and physiological characteristics. Their optimum conditions for the alcohol fermentation in 25% glucose were pH 3.0, 30$^{\circ}C$ and 150 rpm of shaking speed, respectively.

• Korean Journal of Child Studies
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• v.20 no.4
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• pp.159-177
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• 1999

This study analyzed children's personality types with the use of the Murphy-Meisgeier Type Indicator for Children(MMTIC: adapted for Korea by Kim, 1993) and examined their relationship to the Torrance Tests of Creative Thinking(TTCT-figural, form A) and the Creative Personality Test(CPT: Yim,1997). Subjects were 210 third- and 218 sixth-grade students. Data were analyzed by one-way ANOVA and t-test. Personality types Sensation/Judgment(SJ), Sensation/Perceiving(SP), iNtuition/Thinking(NT) and iNtuition/Feeling(NF) differentiated the eleboration, originality, and flexibility dimensions of creative thinking. There were gender differences in the relation of personality type NF to elaboration and fluency. There were age differences in personality types SP and NF in relation to elaboration. Personality types differentiated between the independence, openness, attachment and adventurousness dimensions of the CPT. Age differences in personality type SP differentiated independence and type NT differentiated attachment dimensions of creative personality.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.11
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• pp.2850-2861
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• 1996

This paper describes the design of AATM switch LIS of shared buffer type with linked-list architecture to control memory access. The proposed switch LSI consists of the buffer memory, controller and FIFO memory blocks and two special circuits to avoid the cell blocking. One of the special circuit is a new address control scheme with linked-list architecture which maintains the address of buffer memory serially ordered from write address to read address. All of the address is linked as chain is operated like a FIFO. The other is slip-flag register it will be hold the address chain when readaddress missed the reading of data. The circuits control the buffer memory efficiently and reduce the cell loss rate. As a result the designed chip operates at 33ns and occupied on 2.7*2.8mm$^{2}$ using 0.8.mu.m CMOS technology.

• Journal of the Korea Fashion and Costume Design Association
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• v.6 no.3
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• pp.1-8
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• 2004

The purpose of this study was to investigate gather as decoration techniques of clothes. In this study, we defined 21st century as the modern fashion. And analyzed design that applied gather concerned with Milan, New York, London, Paris, Tokyo Woman's Collections. Data were used from Fashion News and Gap Press Magazine (2001-2004). The results of this study were as follows: 1. Gather was the most original techniques among decoration techniques of clothes and formed three-dimensional space. 2. There were many kinds of gather such as cluster gather, all gather, shirring, smoking, frill, flounce, ruffle. and it gave a different impression with Fabrics, cutting method, sewing method, parts that were used. 3. Gather had practical functions providing enough space in activity and was presented as new shape by three-dimension body motion when it was put on. 4. After analyzing design that applied gather showed in collections, there were various appearance according to designer's sensitivity.

• Journal of the Korean Society of Costume
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• v.53 no.7
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• pp.83-94
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• 2003

The purpose of this study was to investigate the relationship between the clothing consumption value and consumer satisfaction which were based on the purchase places such as department store and market, and to examine the influence of the clothing consumption value and demographic variables on the consumer satisfaction. The subjects were 364 females ranging in ages from twenties to fifties who dwelt in Seoul and in the suburbs of Seoul. Four factors of clothing consumption value derived by factor analysis: 'functional value', 'emotional value', 'epistemic value', and 'conditional value'. The clothing consumption value and satisfaction of shopping system, purchase system, and consumption system of buyers at department store showed higher than that of buyers at market. Emotional value was most important in predicting the consumer satisfaction of buyers at department store, followed by epistemic value (-) and conditional value. Conditional value was most important in predicting the satisfaction of buyers at market, followed by emotional value and the academic background of buyers. Generally the higher the emotional and conditional value, the higher the consumer satisfaction. and the consumer satisfaction was influenced by epistemic value negatively.