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시간제약구문을 갖는 실시간 메카니즘 제어 언어의 설계 및 실행시간 분석
변용현(Yong-Hyun Byun),백정현(Jeong-Hyun Baek),원유헌(Yoo-Hun Won) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2B
컴퓨터 응용분야의 확대로 산업 전 분야에 걸쳐 자동화 시스템의 도입이 촉진되고 있다. 이러한 자동화 시스템은 실시간 메카니즘 제어를 기반으로 하는 로봇(Robot), 수치제어기(NC), 프로그램형 제어기(PC), 분산제어시스템(DCS) 등으로 구성된다. 그러므로, 본 논문에서는 이들을 제어하기 위한 시간제약구문을 갖는 실시간 메카니즘 제어 언어를 제안하고 이를 이용하여 실행시간 분석기법을 개발함으로써 컴파일 시간에 실행시간의 예측이 가능하도록 하였다.
레미콘 슬러지 고형분을 주성분으로 하는 무시멘트 콘크리트의 기초적 특성
변용현 ( Yong Hyun Byun ),류동우 ( Dong Woo Ryu ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.2
With an increase of concrete buildings as result of rapid industrialization, Remicon sludge, which is a strong alkaline construction waste, should be neutralized to prevent damage to a natural environment, and the cost of the neutralization processing is increasing as well. Accordingly, this study investigates the mechanical properties of cementless concrete which is processed with recycled water and industrial byproducts in order to determine the possibility of re-using sludge, recycled sand, and gravel which are contained in recycled water.
폴리프로필렌 섬유를 혼입한 고강도 콘크리트의 화재피해 후 중성화 평가
변용현 ( Byun Yong-hyun ),류동우 ( Ryu Dong-woo ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.3
In recent years, the use of high-strength concrete has increased with increasing height and enlarging scale of the buildings However, it has been pointed out that the use of high-strength concrete is the most serious problem compared to ordinary concrete in terms of the spalling of concrete cross sections caused by fires. For this reason, fiber cocktail methods, which are made of polypropylene fibers, nylon fibers, etc., are mainly used to improve the fire resistance performance. However, the majority of research on high-strength concrete to which the fiber cocktail method was applied is mainly focused on the effect of reducing spalling, and few studies have investigated and analyzed the effect of micropores produced by melting PP fibers on the long-term durability of high-strength concrete after a fire. Therefore, in this study, the effect of micropores on the depth of carbonation was examined through carbonation tests and microstructure analysis, assuming high-strength concrete to which fiber-mixed construction method was applied, which caused fire damage.
고로슬래그를 다량 치환한 고강도 콘크리트의 수산화칼슘 함유율 및 가열온도에 따른 균열성상에 관한 기초적 연구
변용현 ( Yong Hyun Byun ),박동천 ( Dong Cheon Park ),류동우 ( Dong Woo Ryu ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.1
This study is conducted to investigate the characteristics of cracks depending on the different mixture rates of calcium hydroxide and distilled water in high-strength concrete, which is substituted with a high percentage of blast-furnace slag, by using specimens produced under different heating temperatures: 600℃, 800℃, and 1000℃, respectively. According to the results of the study, the specimen heated under the temperature of 600℃ did not produce cracks; the specimen heated under 800℃ produced little cracks and showed no difference between calcium hydroxide and distilled water; whereas the specimen heated under 1000℃ produced cracks larger than 5mm on average in the case of calcium hydroxide, compared to distilled water.
시설 거주 여성노인의 체질량지수 차이가 신체 구성, 심폐 적성과 슬관절 등속성 근력에 미치는 영향
변용현(Yong Hyun Byun),김상훈(Sang Hoon Kim),김태수(Tae Soo Kim) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.52
The purpose in this study was to identify the effect of BMI difference on body composition, cardiopul-monary, low extremity muscular functions in institutionalized elderly women over than 65 years. The sixty-two elderly women over 65 ages involved voluntary in this study. All of them were healthy status that have no problem with cardiorespiratory and muscular condition. They were separated normal(18.5-22.9kg/m2, n=25), overweight(23-24.9 kg/m2, n=16), obesity group(over than 25kg/m2, n=21) by BMI. They measured body composition, cardiopulmonary, low extremity muscular function test. The data was analyzed by using descrip-tive statistics, one-way ANOVA, and Ducan post-hoc. The results are below; First, Obesity groups displayed increased Weight, Fat mass, %body fat, BMI factors compared to normal groups. Second, Obesity groups displayed increased rest diastolic blood pressure, peak systolic blood pressure, peak diastolic blood pressure compared to normal groups. as well as, Obesity groups displayed decreased peak heart rate compared to normal groups. Third, Obesity and overweight groups displayed increased isokinetic strength of 60° compared to normal groups. In conclusion, The BMI differences observed among groups in their factors. The more BMI increases, the worse the obesity related fitness factors is in institutionalized elderly women over than 65 years.
장기간의 운동이 시설거주 여성노인의 신체구성, 심혈관 건강 및 등속성 하지근력에 미치는 효과
변용현(Byun, Yong-Hyun) 한국사회체육학회 2016 한국사회체육학회지 Vol.0 No.65
The purpose in this study was to examine the effect of 18 months exercise program has on body composition, cardiovascular health and isokinetic leg strength in older women living in residential aged care facilities. Nine healthy older women (> 65 yrs) without any overt clinical disease participated in the planed exercise program (2-3 d/wk, 60-70 min/d). Body composition, cardiovascular health, and isokinetic leg muscle strength were measured at pre-intervention, 6-month after intervention, 12-month after intervention, and 18-month after intervention with the same standard operating procedure. The data were analyzed by using descriptive statistics, one-way ANOVA with repeated measures, and Bonferroni post-hoc. In this study, the long-term exercise did not make any change in body weight and body mass index. However, body fat mass and percent body fat were significantly decreased and fat free mass was significantly increased. After the long-term exercise, resting heart rate and blood pressure did not change, but maximal heart rate was significantly increased. In terms of muscle strength, the long-term exercise significantly enhanced bilateral leg muscle strength at all offered isokinetic conditions (60°/sec, 180°/sec, and 240°/sec). To conclude, the long-term exercise intervention has a positive effect on body composition and leg muscle strength in older women living in residential aged care facilities.
중량함수율 및 상대함수율 비교에 따른 정량적인 함수율 산정에 대한 실험적 연구
변용현 ( Yong Hyun Byun ),류동우 ( Dong Woo Ryu ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.1
This study aims to compare relative moisture content and gravity moisture content in calculating the rational percentage of moisture content. High-strength concrete, which is made of blast-furnace slag and silica fume, was used as the compound for this study, and the specimens were made into a saturated condition through the vacuum suction. According to the results of this study, all specimens were completely dried when they were under the temperature of 10 5℃ for more than 31 days. They were fully saturated after 72 hours through vacuum suction. In addition, relative moisture content responded more sensitively to moisture content than gravity moisture content did, so it can be concluded that relative moisture content is better in calculating the rational percentage of moisture content.
시설 거주 남성노인의 체질량지수 수준에 따른 체구성, 심장 기능과 하지 등속성 근기능의 차이
변용현(Yong Hyun Byun),김상훈(Sang Hoon Kim),김태수(Tae Soo Kim) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.53
The purpose in this study was to identify the effect of BMI difference on body composition, cardiovascular, low extremity muscular functions in institutionalized elderly men over than 65 years. The sixty-two elderly women over 65 ages involved voluntary in this study. All of them were healthy status that have no problem with cardiorespiratory and muscular condition. They were separated normal(18.5-22.9kg/m2, n=25), overweight( 23-24.9 kg/m2, n=16), obesity group(over than 25kg/m2, n=21) by BMI. They measured body composition, cardiovascular, low extremity muscular function test. The data was analyzed by using descriptive statistics, one-way ANOVA, and Ducan post-hoc. The results are below; First, Obesity groups displayed increased Weight, Fat mass, %body fat, BMI factors compared to normal groups. Second, Obesity groups displayed increased rest heart rate, rest diastolic blood pressure compared to normal groups. as well as, Obesity groups displayed decreased peak systolic blood pressure compared to normal groups. Third, Obesity and overweight groups displayed decreased isokinetic strength of 60° and 180° compared to normal groups. In conclusion, The BMI differences observed among groups in their factors. The more BMI increases, the worse the obesity related fitness factors is in institutionalized elderly men.