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가미진간식풍탕(加味鎭肝熄風湯)이 손상(損傷)된 배양척수운동신경세포(培養脊髓運動神經細胞)에 미치는 영향(影響)
김성환,심정섭,김강산,강병기,이재익,Kim, Seong-Hwan,Sim, Jeong-Sub,Kim, Kang-San,Kang, Byung-Ki,Lee, Jae-Ik 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.2
The purpose of this study is to examine the toxic effects caused by xanthine oxidase/hypoxanthine(XO/HX) and the effects of herbal extracts such as Jingansikpungtang(JST) and Gamijingansikpungtang(GJST) on the treatment of the toxic effects. For this purpose, experiments with the cultured nerve cells from the spinal motor neurons of new born mice were done. The results of these experiments were as follows. XO/HX, a oxygen radical-generating system, decreased the survival rate of the cultured cells on NR assay. MTT assay, the amount of neurofilaments and increased the amount of total proteinand increased the lipid peroxidation and the amount of LDH JST has the efficacy of increasing the amount of neurofilaments and total protein, and decreasing the lipid peroxidation and the amount of LDH, GJST has efficacy of increasing the amount of neurofilaments and total protein, and decreasing lipid peroxidation and the amount of LDH. From the above results, it is concluded that JST and GJST have marked efficacy as a treatment for the damages caused in the XO/HX mediated oxidative stress. And JST and GJST are thought to have certain pharmacologicall effects. Further clinical study of this pharmacological effects of JST and GJST should be complemented.
알루미노 실리케이트계 내화보드와 C-STUD를 이용한 고강도 콘크리트의 내화성능
김성환,박지선,이세현,Kim, Seong-Hwan,Park, Ji-Sun,Lee, Sea-Hyun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.11
As high-rise buildings are increasingly constructed on recent days, high-strength concrete is also increasingly used. However, since high-strength concrete happens to have a spalling phenomenon, it is currently required to ensure the fire safety of high-strength concrete as soonest as possible. Therefore, a number of research and development projects are in progress for developing a construction method to ensure the fire-proofing performance of high-strength concrete. In this study, discussion has been done on the fire-proofing performance of the member which was constructed by dry-covering high-strength concrete with alumino-silicate fire resistant board and C-STUD.
김성환,양승일,Kim, Seong-Hwan,Yang, Seung-Il 한국기계연구원 1983 기계연구원소보 Vol.10 No.-
This paper presents the hydrodynamic performance characteristics of a planing boat which was tested with a new dynamometer system specifically designed to measure towing force along the thrust plane, the change in trim angle and the vertical displacement of the model center of gravity from still water condition. The test conditions include systematic variations in the three positions of LCG and the three load coefficients of a high speed planing boat.
김성환,반태원,이웅섭,류종열,Kim, Seong Hwan,Ban, Tae-Won,Lee, Wongsup,Ryu, Jong Yeol 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.4
본 논문에서, 극다중 안테나 시스템을 다중셀 환경에 적용하고 기지국의 안테나 수가 무한하다고 가정한 상태에서, 파일럿 오염으로 인해 제한된 시스템 용량을 개선하는 파일럿 도약 기법을 제안한다. 기존의 파일럿 고정 방식은, 각 사용자가 긴 시간 동안 동일한 Signal-to-interference ratio (SIR)를 얻게된다. 따라서, 약한 간섭을 받게 된 사용자는 지속적으로 SIR이 높은 반면에, 강한 간섭을 받게 된 사용자의 SIR은 지속적으로 낮아서 서비스의 질이 저하된다. 본 논문에서 제안한 파일럿 도약 기법에서는 매 타임 슬롯마다 다른 파일럿 신호를 사용하며, 이에 따라 매번 다른 양의 간섭을 받게 되므로, 매 타임 슬롯마다 SIR이 요동치게 된다. 이러한 채널에서 Hybrid Automatic Repeat & reQuest (HARQ) 기법을 적용할 경우에, 아웃티지 확률과 전송률의 개선 효과를 얻을 수 있다. 본 논문에서는 극다중 안테나 시스템에 파일럿 도약 기법을 적용 후, 체이스 결합 유형의 HARQ를 적용하고 시뮬레이션을 통하여 성능이 개선됨을 보인다. We propose a pilot hopping scheme that improves the limited system capacity due to pilot contamination in multi-cell environment with large-scale antenna arrays at a base station, assuming the infinite number of antennas. In the conventional fixed pilot scheme, each user obtains the same signal-to-interference ratio (SIR) over a long period of time. Therefore, a user with strong interference has continuously low SIR which degrades its service quality. In the proposed pilot hopping scheme, different pilot signals are used for each time slot, and different amounts of interference are received every time. When such a pilot hopping technique is applied, the SIR fluctuates at every time slot. When the Hybrid Automatic Repeat & reQuest (HARQ) technique is applied in such a channel, the outage probability and transmission rate are improved. We show that there is the performance gain of the proposed scheme over the conventional scheme through computer simulations.