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오병환(Oh Byung Hwan),임시내(Lim Si Nae),최영철(Choi Young Cherl) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
The design of sleeper in high-speed railway turnouts is complicated and time-consuming because the length and loading position of sleepers change continuously along the turnout line. It is, therefore, necessary to develop an automated design program which can design automatically the PSC sleepers in turnout region. In this study, a computer program for automatic design of turnout sleepers was developed based on graphic user-interface(GUI) environment. The structural analysis is performed considering the varying loading position of vehicular wheels. The sleepers are treated as located on elastic supports. The user can choose the desirable shape of sleepers before starting the detail design. The present study allows more realistic and automatic design of PSC sleepers in high-speed railway turnouts.
프리텐션 공법의 PC부재의 전달길이 해석 및 예측에 관한 연구
오병환 ( Oh¸ Byung-hwan ),임시내 ( Lim¸ Si Nae ),최영철 ( Choi¸ Young-chul ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
In pretensioned concrete structures, bond between prestressing steel and concrete is an essential component to ensure the integrity of a pretensioned member. The anchorage and development of the prestressing force depend exclusively on bond. The first purpose of this study is to investigate the characteristics of bond and transfer length between pretensioned steel and concrete. The second is to establish the realistic equation of transfer length considering essential variables. In this study. bond-slip relationship is determined from experiment results of stress increase in steel and strain in concrete at transfer. And finite element analysis are carried to determine transfer length considering various variables(strand type, concrete strength, concrete cover, prestressing force) by using bond-slip equation.
손원득(Won-Tug Son),김도훈(Do-Hoon Kim),임시내(Si-Nae Lim),이왕희(Wang-Hee Lee),김정호(Jeong-Ho Kim),박경순(Kyung-Soon Park) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
This study is being conducted to suggest the improvement plan of the ventilation performance of a remodeling apartment house based on the analysis result of the ventilation and indoor air quality in the existing apartment house. This paper presents the results of analyses on the age of air and air change effectiveness, and also present the results of CFD simulation by the DesignBuilder software.
김영운 ( Kim Young Woon ),황용우 ( Hwang Yong Woo ),김용인 ( Kim Yong In ),공윤정 ( Gong Yun Jung ),임시내 ( Lim Si Nae ) 한국전과정평가학회 2018 한국전과정평가학회지 Vol.19 No.1
By climate change, natural disaster like flood, desertification, elnino and etc happens more than before. Adaptation for climate change becomes important as well as respond globally. One of main issue for adaptation is the water circulation recently. Each countries has been developing technology facilitating water circulation. South Korea also develops low impact development(LID) using rain-water. The rain-water collecting system needs to establish for circulating the rain-water in the household area. The side gutter collecting system and round collecting system have been applied as rain-water collecting system. This study aims at evaluating carbon emission in the life cycle of construction, operation&maintenance, demolition and disposal comparing them with drain collecting system which was developed by life cycle assessment(LCA) methodology. Drain collecting system emitted 2.82 ton CO<sub>2</sub> eq./set, round collection system emitted 27.65 ton CO<sub>2</sub> eq./set and side gutter collection system emitted 21.54 ton CO<sub>2</sub> eq./set. From the result, drain collecting system concluded to reduce over 87% of CO<sub>2</sub> emission in the life cycle besides of other two collecting system. Thus decision-makers need to consider to apply LCA for reducing CO<sub>2</sub> emission designing rainwater collecting system.
내부격벽으로 일체화된 2열 소일시멘트벽체와 수동격벽을 이용한 연약지반용 자립식 흙막이 벽체 공법(BSCW 공법) (건설신기술 제915호)
김인철(In Cheol Kim),이치호(Chi Ho Lee),김영윤(Young Yun Kim),김철환(Cheol Hwan Kim),이기철(Ki Cheol Lee),박정규(Jung Gyu Park),장순호(Soon Ho Jang),임시내(Si Nae Lim),류성현(Sung Hyun Ryu),고호성(Ho Seong Ko),이현민(Hyun Min Lee) 대한토목학회 2021 대한토목학회지 Vol.69 No.10
High Performance Liquid Chromatography를 이용한 멜라토닌 측정
최돈찬,임시내 龍仁大學校 2001 용인대학교 논문집 Vol.19 No.-
Melatonin is a pineal hormone that transduces the photoperiodic information into neuroendocrine system. It acts as a regulator of seasonal reproduction, a biological clock to time circadian rhythmicity, an inhibitor on the growth of tumor and cancer cells, and a controller of cardiovascular function. It also shows anti-aging and life-prolonging effects and a supportive role in the immune system. Melatonin was measured using a conventional HPLC apparatus. Although the sensitivity is low compared to the radioimmunoassay or HPLC with fluorescence or electrochemical detector, these results could be applied to the blood samples withdrawn from the living organisms to which a large amount of melatonin was administered. The method used in this study is simple, convenient, and rapid without need of any further equipments.
최돈찬,임시내 용인대학교 자연과학연구소 2001 自然科學硏究所論文誌 Vol.6 No.1
Photoperiod(length of light per day) is a major factor in determining sexual activity in golden hamsters. Long photoperiod(LP, ≥ 12.5 hours of light per day) maintains the sexual activities whereas short photoperiod(SP, ≤ 12 hours of light per day) suppresses them. The information of photoperiod is transmitted to the reproductive system by melatonin that is secreted from the pineal gland. Thus reproductive hormones are investigated in male golden hamsters that are housed in LP or SP and that are injected daily with melatonin in the morning or evening. Reproductive functions are active in the animals housed in LP and injected with melatonin in the morning and inactive in the animals housed in SP and injected in the evening. Paired testicular weights were markedly reduced in the sexually inactive animals. Serum FSH and LH levels were also lower in the sexually inactive animals than in the sexually active animals. When they were measured in the serum taken continuously from the same animal, both LH and FSH displayed pulsatile pattern in sexually active animals, but the pulsation was disappeared in sexually inactive animals. Moreover, the mean values of FSH and LH in regressed animals were much less. The histological examination of regressed testes showed reduction of tubular lumen diameter, interstitial space, and Leydig cell number. Taken together, the effects of photoperiod and melatonin treatment were reflected in reproductive endocrine system. The results suggest that their influence may be mediated by gonadotropin releasing hormone. Therefore, the impact of photoperiod(via melatonin) on GnRH neuronal system needs to be investigated.