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ECC의 피복 및 부착형태에 따른 고강도 콘크리트 기둥의 폭렬저감 방안
김광윤 ( Kim Kwang-yun ),유석형 ( Yoo Suk-hyeong ),권영진 ( Kwon Young-jin ),신성우 ( Shin Sung-woo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
High-strength concrete(HSC) must be designed to protect under the fire because the concrete structure sometimes exposed to very high temperature. Such fire temperature may cause explosive spalling of HSC members. An explosive spalling is defined as the damages of concrete exposed to high temperature during the fire by causing cracks and localized bursting of small pieces of concrete, and reported that is caused by the vapor pressure and thermal stress. The purpose of this study is to obtain the explosive spalling reduction method of HSC members using fire resistance-engineered cementitious composites(FR-ECC) under fire temperature. The present study investigated experimentally the explosion and cracks in heated surfaces of these members. Employed temperature curve were ISO 834 criterion(3hr). In results, the ratio of unstressed residual strength of HSC columns increases and explosive spalling degree decrease by FR-ECC cover.
ECC를 활용한 고강도콘크리트 기둥의 폭렬 저감 방안에 대한 실험적 연구
김광윤(Kim Kwang-Yun),한병찬(Han Byung-Chan),유석형(Yoo Suk-Hyeong),권영진(Kwon Young-Jin),신성우(Shin Sung-Woo) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.9
High-strength concrete(HSC) must be designed to protect under the fire because the concrete structure sometimes exposed to very high temperature. Such fire temperature may cause explosive spalling of HSC members. An explosive spalling is defined as the damages of concrete exposed to high temperature during the fire by causing cracks and localized bursting of small pieces of concrete, and reported that is caused by the vapor pressure and thermal stress. The purpose of this study is to obtain the explosive spalling reduction method of HSC members using fire resistance-engineered cementitious composites(FR-ECC) under fire temperature. The present study conducted the experiment to simulate fire temperature by employing of FR-ECC and investigated experimentally the explosion and cracks in heated surfaces of these members. Employed temperature curve were ISO 834 criterion(3hr), which are severe in various criterion of fire temperature in concrete buildings. In results, the ratio of unstressed residual strength of HSC columns increases and explosive spalling degree decrease by FR-ECC cover. And the FR-ECC spalling reduction methods(cover thk. 30 to 50㎜) shows the better fire resistance performance in HSC members.
ECC를 활용한 고강도 콘크리트 기둥의 폭렬 저감 방안
김광윤 ( Kim Kwang-yun ),유석형 ( Yoo Suk-hyeong ),권영진 ( Kwon Young-jin ),신성우 ( Shin Sung-woo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
The results of a recent research project have shown a great influence of various fibers on the spalling behavior of concrete under fire loading. This study is investigated by ECC of a kind of fibers. Normal ECC offers significant potential for high tensile strain capacity of more than 3%, and controlled micro-cracking, but using ECC in this study is the Fire resistance engineered cementitious composites(FR-ECC) in order to use the fire protection material. Therefore, test results indicated about influence of fire protective thickness of FR-ECC for HSC from spalling.
고강도 철근콘크리트 기둥의 폭열제어를 위한 최적의 모근섬유함유량 산정
김인기 ( Kim In-ki ),김광윤 ( Kim Kwang-yun ),유석형 ( Yoo Suk-hyeong ),신성우 ( Shin Sung-woo ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
As the concrete strength increases the degree of damage caused by the spalling becomes more serious because of the permeability. It is reported that the polypropylene(PP) fiber has an important role in protecting concrete from spalling and the optimum dosage of PP fiber is 0.2%. However, the study was conducted on the nonreinforced concrete specimens. The high-temperature behavior of high-strength reinforced concrete columns with various concrete strength and various dosage of PP fibers was investigated in this study. In results, the ratio of unstressed residual strength of columns increases as the concrete strength increases and the ratio of unstressed residual strength of columns increases as the dosage of PP fiber increases from 0% to 0.2%, however, the effect of fiber dosage on residual strength of column barely changes above 0.2%.
중력 가속도로 인한 의식상실 감지 및 자동 회복 시스템 개발
김종섭(Chong-sup Kim),황병문(Byung-moon Hwang),강임주(Im-ju Kang),장순용(Soon-ryong Jang),김광윤(Kwang-yun Kim),박명환(Myung-hwan Park) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.7
For many years, many pilots lost their lives and aircrafts due to GLOC(Gravity-induced Loss Of Consciousness). Due to the emergence of high-gravity maneuvering aircraft such as the F-16, F-15 and T-50, the automatic GLOC detection and recovery systems are necessary to increase the aircraft safeties even when the pilot loses his consciousness due to high-G maneuvering. This paper addresses the design of GLOC detection, warning and recovery algorithm based on a model of supersonic jet trainer. The system is solely controlled by the pilot"s control input(i.e., control stick force) and aircraft status such as attitude, airspeed, altitude, altitude and so forth. And, moreover, it does not depend upon any pilot physiological condition. The test evaluation results show that the developed system supports the recovery of an aircraft from the unusual aircraft attitude and imporves the aircraft safeties even when the pilot loses his consciousness due to high-G maneuvering.
만성정신분열증 환자의 혈장 ß- Endorphin樣 물질에 관한 연구
김광윤,김이영,김광일 한양대학교 의과대학 1982 한양의대 학술지 Vol.2 No.1
Since discovery of endogenous morphine(endorphin) from the brain tissue of pig, this substance has been recognixed as a new neurotransmitter candidate. In psychiatric field, several researchers have reported considerable relation between endorphin activity and schizophrenia, whereas definite relationship has not yet been established due to contradictory findings of research. The author performed this study to investigate possible change of plasma endorphin level in chronic schizophrenic patients and to clarify possible influence of antipsychotic drug on the level. twenty five chronic schizophrenic patients and 9 normal controls were randomly selected for the study and the patients were divided into two groups; drug-free group and haloperidol group. The drug-free group consisted of 11 cases switched by placebo for 14 days prior to blood sampling. And the haloperidol group consisted of 14 cases to whom 10-15mg of haloperidol were medicated orally of 14days. Five ml of blood was sampled at 9:00~9:30 a.m. on the 15th day in a fasting state and plasma level of β-endorphin-like substance was measured by radioimmunoassay procedure. Criterion of increased level of the substance was determined to be 25pg/ml according to the fact that the lowest measurable level in this procedure was 20pg/ml and the levels of the substance were below the lowest level in 88% of normal sample. The cases of increased β-endorphin-like substance could be found to be 5 among 11 cases(45.5%) in drug-free group, 3 among 14 cases(21.4%) in haloperidol hroup, and none among 9 cases in control group(0.05>p>0.025). This finding presumably suggests that plasma endorphin level increases in chronic schizophrenics and dopamine antagonist, haloperidol possibly suppresses endorphin level. The previous researchers confirmed incresed activity of endorphin in acute schizophrenics but contradictory findings in chronic cases. The findings of normal endorphin activity in chronic schizophrenics could be explained from the fact that previous antipsychotic medication could give influence on the endorphin activity. Finally, possible mechanisms of action of endorphin in relation to schizophrenic manifestation were discussed with experimental findings and hypotheses of the previous researchers.
Thioxanthene 系 藥物에 의한 知覺-認知障碍病例
金光日,金光潤 大韓神經精神醫學會 1978 신경정신의학 Vol.17 No.4
Two cases of paradoxical side reaction of preceptual-cognitive disorders to Thiothixene were reported. Side reactions were developed in two recovered schizophrenics who had been given 5mg of Thiothixene in daily single dose for 4 and 5 days. Intensified visual stumuli influx and cognitive confusion lasting for several hours were the main picture of the side reaction. They described their experiences as following; "Sunddenly, I became puzzled because everything was so sharp and vivid in shape and color that I could not recognize it, and I could not understand the meaning of the things that I had seen." The experiences were repeated daily in the afternoon during the medications, and disappeared after withdrawal of the drug. The afore-mentioned disorders reappeared by remedication of the drug in each case. Mechanism of the perceptual cognitive disorders remains unknown. It is suggested that clinicians should be aware of such unusual paradoxical side reaction to Thiothixene.
김광윤 大韓神經精神醫學會 1977 신경정신의학 Vol.16 No.4
Eleven cases whom initially diagnosed as schizoaffective schizophrenia were followed up ver two years for the purpose of evaluating the later fate of the course, and considerable problems concerning schizoaffective schizophrenia as a disease entity and diagnostic orientation of it were discussed with the previous researches. Among the 11 cases, 4 were being become obviously manic depressive; one, typically schizophrenic; whereas one remained schizoaffective and other 5 cases maintained normal life. It is likely that, when evaluating the course longitudinally, the schizoaffective schizophrenia has no its constant clinical feature but reveals some transient symptom complex, and there is no evidence of changing clinical entity perse according to the time passing. It is rather possible to assume that considerable thinking disorders which seen at the early state of manic depressive illness especially of acute mania, delirious mania or stuporous depression may contribute to diagnostic confusion, whereas strong affective symptoms of early stage of schizophrenia may give a cue in diagnosing schizoaffective schizophrenia.