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RISS 인기검색어
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- 저자 : 李廣植(Kwang-Sik Lee) (검색결과 637 건)
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Ag 씨앗층이 SmCo / Cr 박막의 자기적 특성과 미세구조에 미치는 영향
고광식(Kwang-Sik Ko),이성래(Seong-Rae Lee),김영근(Young Keun Kim) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.2
The effects of an Ag seed layer on the magnetic properties and the microstructural evolution of SmCo/Cr thin films deposited on glass substrates were investigated. Coercivity of the films is 2.0 kOe when the thickness of Ag seed layer was 1 ㎚ thick, but it increased to 2.7 kOe when the Ag seed layer thickness is 3 ㎚. The increase of coercivity for film with 3 ㎚-thick Ag is due to roughness of Cr and grain size of Cr by the Ag microbumps. Ar partial pressure influenced on the formation of Ag microbumps, for example, they were formed at 5 mTorr when Ag thickness was 1 ㎚. The mechanism of magnetization reversal of the SmCo films changed from domain wall motion to domain rotation as the Ag inserted. This was thought to be due to inhibition of domain wall motion by the reduction of Cr grain size and the increase of roughness.
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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.
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林廣植(Kwang-Sik Lim),李鍾範(Jong-Beom Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
This paper describes the effect of transient state in underground transmission and distribution lines installed together in the same tunnel. Two systems installed in the same tunnel are operated by the common grounding. This paper analyzed that how much one of the two kinds of systems influences the other systems during the transient state by EMTP/ATPDraw. Single line-to-ground fault and lightning surge were selected in transient state condition. These cases were simulated variously according to the variation of common grounding magnitude, fault location and lightning surge magnitude. It is evaluated that the analyzed results will be used for establishment and operating materials of common grounding in the same tunnel.
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트레드밀 강도별 운동 및 기간별 저강도 운동이 흰쥐 뇌의 세로토닌 활성도에 미치는 영향
이광식 ( Kwang Sik Lee ),신호수 ( Ho Su Shin ),김창주 ( Chang Ju Kim ) 한국운동영양학회 2004 Physical Activity and Nutrition (Phys Act Nutr) Vol.8 No.1
The present study investigated the effects of intensity of treadmill exercise and duration of mild-treadmill exercise on activity of 5-HT in the cerebral cortex and dentate gyrus of rats via immunohistochemistry. For intensity-dependence treadmill exercise, rats were randomly assigned to four groups: the control group, the mild-exercise group, the moderate-exercise group, and the severe-exercise group (n = 10 in each group). For duration of mild-treadmill exercise. animals were divided into six groups: the control group, the 1 day-exercise group, the 3 days-exercise group, the 1 week-exercise group, the 2 weeks-exercise group, the 4 weeks-exercise group (n = 10 in each group). Thirty minutes after each exercise, rat brains were surgically removed for the histochemical determination of the 5-HT activity. The results were as follows; 1. 5-HT activity of the cerebral cortex was increased from treadmill exercise with increment of intensity. but no significant difference observed between the control group and the mild-exercise group. However, 5-HT activity of the dentate gyrus was increased in the mild-exercise group, and which it decreased with increasing of intensity. Also, no significant difference observed between the control group and the severe-exercise group. 2. In duration of mild-treadmill exercise. 5-HT activity of the cerebral cortex was increased the maximum level in the ] week of exercise, after which it gradually decreased. However, 5-HT activity of the dentate gyrus reached the maximum level on the 3 days of exercise and it maintained until 2 weeks, which it gradually reduced. Overall, there are different tendency represented impact of intensity of treadmill exercise on the 5-HT synthesis between cerebral cortex and dentate gyrus that is involved in the affect and the learning and memory. These results indicate that although the exercise can evoke central fatigue, whereas it could give a positive effect on learning and memory. and it suggests that the mild-exercise is more effective in terms of increasing learning and memory.
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이광식,정재일,Lee, Kwang-Sik,Chung, Jae-Il 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.4
In this paper an attempt is made to explain some of the factors controlling oxygen and hydrogen isotopic variations of precipitation in Pohang by analysing the IAEA data (1961~1976) through statistical correlations and trend observations. During this period, the values of ${\delta}^{18}O$ and D varied widely from -17.80 to +0.07‰, and from -131.9 to +7.7‰, respectively, and fall along a local meteoric water line defined by ${\delta}D=(8.05{\pm}0.32)$ ${\delta}^{18}O+(12.72{\pm}2.44)$ (n=108, ${\gamma}^2=0.86$). The ${\delta}^{18}O$ and ${\delta}D$ values of the precipitation appear to be little dependent on temperature. Although the amount effect is clearly shown in summer precipitation of 1963 and 1965, the isotopic composition of summer precipitation seems not to be greatly dependent on the amount of precipitation.
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임광식(kwang-Sik Lim),이종범(Jong-Boem Lee),정채균(Chae-Kyun Jung),강지원(Ji-Won Kang),박홍석(Hung-Sok Park) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
This paper is analysed by switching overvoltage on operating reclosing in 154[㎸] combined transmission systems. Combined transmission systems are modeled by EMTP/ATPDraw program. It is fault condition that simulate high resistance earth fault. The simulation is carried out considering variation of parameters such as resistance value of fault point and rate of underground line.
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