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슈미트햄머의 반발도 및 초음파속도에 미치는 결합재의 영향
한민철,이백수,윤기원,최영화,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This paper reports the influence of kinds of cement and replacing ratio of fly ash(FA) and blast furnace slag powder(BS) on estimation of compressive strength by non-destructive test. According to the results, the compressive strength, the rebound value of schmidt hammer and ultrasonic pulse velocity show the higher value in order of AMC, UHC and OPC. In concrete replaced with mineral admixture, they are lower at early age, but higher at the age of 91 days compared with plain concrete. As the influence of the kinds of cement, estimated compressive strength by Schmidt hammer is almost same in the case of UHC, but much lower at the same rebound value in the case of AMC, in comparison with OPC. But the influence of mineral admixture is very insignificant. Compressive strength estimated by ultrasonic pulse velocity method shows the higher value by 10MPa, 12.5MPa in the case of UHC and AMC respectively compared with OPC, and the influence of mineral admixture on ultrasonic pulse velocity is insignificant.
난포기 및 황체기에 있어서 돼지 난관 협부 평활근의 neurotransmitter들의 수축효과에 대한 estradiol-17β및 progesterone의 영향
이민기,노규진,심철수,남윤정,김주현,최상용 慶尙大學校 1991 論文集 Vol.30 No.2
The effects of estradiol-17β or progesterone on the contractility of neurotransmitters on pig oviductal isthmic smooth muscle were investigated. The motility of the isolated smooth muscle was recorded by using physiological recording system. The results were summarized as follows : 1. The contractility induced by histamine or prostaglandin F2α was depressed by the pretreatment of estradiol-17β but was not by the preteatment of progesterone in follicular or luteal stage. 2. The contractility induced by acetylcholine was depressed un follicular stage but excited in luteal stage by the pretreatment of estradiol-17β or progesterone. 3. The contractility induced by norepinephrine was depressed by the pretreatment of progesterone in follicular stage but was excited by the pretreatment estradiol-17β in luteal stage.
한민철,김경민,신동안,윤기원,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
In this paper. variations of the period of cold weather concrete in Korea are discussed based on the climate data of Korean Meteorological Adminstration(KMA). Determination of the period of cold weather concrete with the region is done by following Korean Concrete Institute(KCD, American Concrete Institute(ACD and AIJ(Architectural Institute of Japan(AIJ) specification. Present study is compared with previous study done by the authors. Period of cold weather concrete is found to increase with high altitude and in-land and mountain area. Period of cold weather concrete by present study is shorted compared with that of previous study by about 3~6 days regardless of applied specification. Especially. the period of cold weather concrete at southern region near sea is reduced remarkably compared with that of previous study. This is due the rise of mean air temperature by global warming. In the scope of present study, period of cold weather concrete is provided with table and map diagram.
회수수에 당류계 안정화제를 처리한 시멘트 모르터의 특성
金虎林,우종완,한민철,류현기,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
In this paper, fundamental properties of cement mortar using recycled water with stabilizing agent are discussed in order to investigate the applicability of recycled water. Stabilizing agent content, solid contents and open time are varied in this paper. For fresh mortar properties, highest fluidity with 0.15% of stabilizing agent was observed and air content was increased with an increase in stabilizing agent contents. Solid contents and open time of recycled water had nothing to do with fluidity and air content loss. Little difference in setting time was found with the presence of stabilizing agent and without, while it was accelerated with an increase in open time and solid content. For strength properties, the highest strength value was observed at 0.15% of stabilizing agent. An increase in solid contents resulted in an enhancement of strength, while strength decreased with an increase in open time and elapse of age. Drying shrinkage exhibited a reduction with an increase in stabilizing agent contents and open time. From the present paper, the combination of 0.15% of sacharic based stabilizing agent, 3% of solid content and 1day of open time is found to be an optimal condition to perform effectively.
Gi Do Kim,Kyung Ok Min,Kyung Yoon Kim,Ki Cheol Sim,Ki Won Nam,Ja Pung Koo,Joo Hyun Park,Ok Kon Moon,Seong Hun Yu,Gye Yeop Kim 국제물리치료학회 2010 Journal of International Academy of Physical Ther Vol.1 No.2
This study is intended to examine the motor skill learning and treadmill exercise on motor performance and synaptic plasticity in the cerebellar injured rats by harmaline. Experiment groups were divided into four groups and assigned 15 rats to each group. GroupⅠ was a normal control group(induced by saline); GroupⅡ was a experimental control group(cerebellar injured by harmaline); GroupⅢ was a group of motor skill learning after cerebellar injured by harmaline; GroupⅣ was a group of treadmill exercise after cerebellar injured by harmaline. In motor performance test, the outcome of groupⅡ was significantly lower than the groupⅢ, Ⅳ(especially groupⅢ)(p<.001). In histological finding, the experimental groups were destroy of dendrities and nucleus of cerebellar neurons. GroupⅢ, Ⅳ were decreased in degeneration of cerebellar neurons(especially groupⅢ). In immunohistochemistric response of synaptophysin in cerebellar cortex, experimental groups were decreased than groupⅠ. GroupⅢ's expression of synaptophysin was more increased than groupⅡ, Ⅳ. In electron microscopy finding, the experimental groups were degenerated of Purkinje cell. These result suggest that improved motor performance by motor skill learning after harmaline induced is associated with dynamically altered expression of synaptophysin in cerebellar cortex and that is related with synaptic plasticity.
매개공간 개념을 통한 인프라스트럭처의 재해석에 따른 공공 공간에 관한 연구
민철기(Min Cheol-Gi),이영수(Lee Young-Soo) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(계획계)
The infrastructure of urban scale comes to play a bigger role because of the side of efficiency and political reason when industry develops and its structure becomes higher. As a matter of fact, Mass-Infra faithfully takes charge of its role and supports the urban structure and function in the society of modern industry. And such a Mass-Infra needs the infrastructure of a huge scale which is suitable for its function and prestige. But by the infrastructure, surplus spaces are made or the severance and isolation of public spaces takes place. The infrastructure of Mass-Infra which was made for the urban function and environmental convenience exerts a harmful influence in the public area. This study suggests a program that can settle the problems caused by the infrastructure such as surplus spaces and the severance and isolation of public spaces and make a cultural harmony and a place of connection in the public area. In addition, this study tries to form the public area of society and culture through their functional and organic arrangement and ultimately has much sense in groping for the sustainable possibility of construction by using the infrastructure itself.
멀티 코어를 위한 효율적인 JAVA Full GC Compact 방법
민철기(Cheol Gi Min),염헌영(Heon Y. Yeom),한혁(Hyuck Han) 한국정보과학회 2021 정보과학회 컴퓨팅의 실제 논문지 Vol.27 No.3
본 연구에서는 기존의 JAVA Full GC Parallel Compact를 대체할 수 있는 새로운 compact 방법을 제시한다. 기존 방법을 분석하고 문제점을 찾아내며 이를 해결하기 위해 compact를 병렬 처리하는 부분과 단독 처리하는 부분으로 분리한다. 병렬 처리 부분에서는 각 영역(region) 별로 영역 내부의 객체들을 독립적으로 처리하도록 하여 병렬성을 극대화한다. 그 뒤에 단독 처리 부분에서 개별적으로 처리된 영역들을 영역 앞쪽으로 모아 기존의 compact와 동일한 결과물을 만들게 한다. 이 때, 리눅스 커널에 구현한 페이지 테이블 조작 syscall 함수를 이용하여 하나의 쓰레드로도 효율적인 처리가 가능하게 한다. 평가를 위해 dacapo, specjvm2008 벤치마크와 Apache Spark 상에서 구현한 PageRank를 통해 실험하여 제안한 방법의 우수성을 보이고자 한다. In this study, we propose a new compact algorithm that can replace existing the JAVA Full GC Parallel Compact. We first analyze the existing compact algorithm and characterize the inefficiencies of the algorithm. Then, to address these inefficiencies, we approach the problem into two parts by splitting the compact job into multi-threaded work and single-threaded work. In the multi-threaded part, we maximize parallelism by independently processing objects in regions. Then, in the single-threaded part, we move the regions to the start of space and obtain the same result with existing algorithm. In this process, we use page table manipulation for efficient region movement. Finally, we evaluate our scheme using dacapo, SPECjvm2008 benchmark, and PageRank on top of Apache Spark.