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고장조건에 따른 지중송배전계통에서 공통접지의 영향 분석
임광식(Kwang-Sik Lim),이종범(Jong-Beom Lee) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This paper describes that the effect on the other system is generated by the single line to ground fault of the underground transmission systems and distribution systems established the common ground in trefoil. Each system is modeled by EMTP/ATPDraw and the system carry out simulations according to the various values of common ground to analyse. In this study, the result of analysis based on simulation suggests protection method and ground system of each system.
산소와 수소 동위원소 분석을 위한 시료 전처리 기술에 대한 고찰
이광식,이인성,Lee, Kwang-Sik,Lee, Insung 대한자원환경지질학회 1996 자원환경지질 Vol.29 No.2
For many years oxygen and hydrogen isotope analysis have been used as one of the most valuable research tools to investigate many geological processes. There are many sample preparation techniques of oxygen and hydrogen isotope analysis for various geological samples. We introduce here several important sample preparation techniques for oxygen and hydrogen isotope analysis and discuss the problems of each method in detail.
무주 지역 각섬암의 지구화학 및 Sm-Nd 동위원소 연구
이광식,정창식,박계헌,장호완,Lee, Kwang-Sik,Cheong, Chang-Sik,Park, Kye-Hun,Chang, Ho-Wan 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.4
Geochemical and Sm-Nd isotopic results are reported for amphibolite of the Muju area, Ryeongnam massif. Major and trace element data analyzed indicate that the parental rock of the Muju amphibolite is tholeiitic basalt. The Sm-Nd amphibole-WR-plagioclase data define an isochron corresponding to $1766{\pm}121Ma$ ($1{\sigma}$) (MSWD=1.10) with an initial ratio of $0.51032{\pm}15$. We interpret this age as a metamorphic age of the Muju amphibolite. Tectonic discrimination diagrams clearly fail when they are applied to the Muju amphibolite probably due to compositional variations resulting from crustal contamination and/or degrees of partial melting.
도토리에서 분리한 Dotorioside I, II의 구조
임광식,손미정,이시강,Im, Kwang-Sik,Son, Mee-Jeong,Lee, See-Kang 대한약학회 1994 약학회지 Vol.38 No.3
From the methanolic extractive of the fruits of Quercus acutissima $C_{ARRUTHERS}$(Fagaceae) a mixture(QC-A saponin) of two ester glycosides, which were named as dotorioside I(3) and ll(4), was separated by silica gel column chromatography and HPLC. The structures of these two glycosides including their genuine aglycones(1,2) were elucidated as 1: $2{\alpha}$, $3{\beta}$, $19{\alpha}$, 23-tetrahydroxyolean-12-en-28-oic acid, 2: $2{\alpha}$, $3{\beta}$, $19{\alpha}$, 23-tetrahydroxyurs-12-en-28-oci acid, 3: 28-O-${\beta}$-D-glucopyranosyl ester of 1, 4: 28-O-${\beta}$-D-glucopyranosyl ester of 2, respectively, on the basis of chemical and spectral evidence.
윤광식 ( Yoon Kwang-sik ),한국헌 ( Han Kuk-heon ),최수명 ( Choi Soo-myung ),김진택 ( Kim Jin-taek ),이용직 ( Lee Yong-jik ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
To devise better development plan, survey was conducted about current Farmer's irrigation Practice on upland in the Youngsan River Irrigation Project District IV. Major upland crops are garlic and onion in this region. Currently, upland irrigation is conducted using ground water. It is found that irrigation interval is 2-3 day for dry-field rice and 3 -7 days for other crop, in general. Whole day is required to irrigate for many farmers due to lack of facilities and water source. Farmers have no intention to change staple crops even after completion of Irrigation Project of Youngsan River District IV.
이광식,최은혁,박광서,김종환,임창호,Lee Kwang-Sik,Choi Eun-Hyuck,Park Kwang-Seo,Kim Jong-Whan,Lim Chang-Ho 대한전기학회 2005 전기학회논문지C Vol.54 No.8
In this paper the experiments of breakdown characteristics by temperature change of $SF_6$ gas, $SF_6$ liquid ($LSF_6$) and $N_2$ liquid ($LN_2$) in model GIS(Gas Insulated Switchgear) were described. From the experiments results, the breakdown voltage of $SF_6$ increases with the drop of temperature and the increase of the inner pressure in model GIS. The ability of $LSF_6$ insulation is higher than high-pressurized $SF_6$ gas and $LN_2$. The breakdown characteristics of $LSF_6$ were produced by bubble formed evaporation of $LSF_6$ and bubble caused by high electric emission. It is considered in this paper that the results are fundamental data for electric insulation design of superconductor and cryogenic equipments machine교 which will be studied and developed in the future.
이광식 ( Kwang-sik Lee ),한승철 ( Seung Chul Han ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
스마트 그리드는 IT 기술을 전력망에 도입함으로써 전력 인프라의 신뢰성, 효율성, 안전성 등을 향상 시키고 공급자와 소비자 간의 양방향 통신을 가능하게 하여 전력 선택 범위를 넓히고 전력 인프라의 효율성을 향상시키는 차세대 지능형 전력망이다. 그러나 스마트 그리드의 효과적인 운용을 보장하기 위한 보안서비스 제공을 위해서는 전력망 내의 통신환경에 대한 특성 파악과 보안 서비스가 전력 통신망에 끼치는 영향을 파악하여야 한다. 본 연구에서는 보안 서비스와 네트워크 부하가 전력 통신망에 어떠한 영향을 주는지 실험을 통해서 분석한다.