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.

폴리프로필렌 섬유를 혼입한 고강도 콘크리트의 화재피해 후 중성화 평가

변용현 ( Byun Yong-hyun ),류동우 ( Ryu Dong-woo ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.3

최근 국내·외 건축물들의 초고층화·대형화에 따라 고강도 콘크리트의 사용이 날로 증가하고 있으나 이러한 고강도 콘크리트는 일반강도 콘크리트에 비해 화재에 의한 콘크리트단면의 폭렬현상이 가장 심각한 문제점으로 지적되고 있다. 이에 따라 내화성능 향상대책으로 폴리프로필렌 섬유, 나일론 섬유 등을 혼합한 섬유혼입공법이 주로 사용되고 있다. 그러나 섬유혼입공법이 적용된 고강도 콘크리트에 대한 대다수의 연구는 주로 폭렬저감 효과에 집중되어 있으며, 화재 후 PP섬유가 용융되어 생성된 미세공극이 고강도 콘크리트의 장기내구성에 미치는 영향을 조사·분석한 연구는 거의 없다. 따라서 본 연구에서는 화재피해가 발생한 섬유혼입공법이 적용된 고강도 콘크리트를 가정하여 중성화시험 및 미세구조분석을 통하여 미세공극이 중성화 깊이에 미치는 영향을 검토하였다. 그 결과, 300℃에서 1시간만 노출되어도 콘크리트 내부의 PP섬유가 중심부까지 전부 용융되어 중성화 촉진이 원활히 진행된 것으로 나타났다. 화재 후 PP섬유가 혼입된 고강도 콘크리트는 PP섬유가 용융되어 생성된 모세관 공극의 연결성 증가 및 미세균열증가로 인해 장기내구성에 대한 심각한 피해가 우려되며, 섬유혼입공법이 적용된 고강도 콘크리트의 장기내구성에 대한 더욱 정밀한 조사 및 분석이 요구된다. 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.

슬개대퇴동통증후군 환자의 저속ㆍ고속부하에서 등속성 운동시대퇴사두근의 근력과 표면근전도 분석

변용현(Byun Yong-Hyun),이현희(Lee Hyun-Hee),한상완(Han Sang-Hwan) 한국코칭능력개발원 2007 코칭능력개발지 Vol.9 No.1

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.

화재피해를 입은 콘크리트의 강도수준별 내화특성 피해 진단·평가에 관한 실험적 연구

변용현(Byun Yong hyun),류동우(Ryu Dong woo) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.6

콘크리트는 고온에 의한 열화현상이 심각한 것으로 알려져 있으므로 화재피해 건축물에 대한 신속한 진단·평가가 요구된다. 특히, 열에 의한 중성화 깊이는 화재시 콘크리트 구조물의 수열상태를 유추할 수 있는 간단하지만 매우 중요한 인자로 평가되고 있으나 페놀프탈레인 용액에 의한 중성화 깊이 평가는 과소평가되어 정확한 수열온도의 추정이 요구된다. 본 연구에서는 화재피해를 입은 구조물의 열에 의한 중성화 깊이를 정량적으로 분석하고자 한다. 페놀프탈레인 용액에 의한 중성화 깊이 측정에 미량의 Ca(OH)₂일지라도 영향을 미쳐 더욱 정밀한 수열온도 추정이 요구된다. 섬유혼입공법 적용 고강도 콘크리트는 화재 후 PP섬유가 용융되어 생성된 공극으로 발생하는 내구성 피해에 대한 지속적인 연구 및 분석이 필요할 것으로 판단된다. Concrete is known to be seriously deteriorated by high temperature, so rapid diagnosis and evaluation of buildings damaged by fire are required. Especially, the depth of carbonation is considered to be a simple, but very important factor for predicting the hydrothermal state of concrete structures in case of fire. However, evaluation of carbonation depth by phenolphthalein solution is underestimated and accurate heated temperature estimation is required. In this study, we quantitatively analyze the depth of carbonation due to heat of structures damaged by fire. Even a trace amount of Ca(OH)₂ is influenced by the phenolphthalein solution to measure the depth of carbonation, and more accurate estimation of the heated temperature is required. It is necessary to continuously analyze the durability damage caused by the pores generated by melting the PP fiber after the fire.

P.P섬유가 적용된 고강도 콘크리트의 고온 가열 후 중성화 피해에 관한 실험적 연구

변용현(Byun, Yong Hyun),류동우(Ryu, Dong Woo) 한국콘크리트학회 2017 한국콘크리트학회 학술대회 논문집 Vol.29 No.1

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.

시설거주 노인의 연령과 성별에 따른 신체구성, 하지근력 및 심혈관 변인의 분석

박용기(Park, Yong-Gi),심영제(Sim, Young-Je),변용현(Byun, Yong-Hyun) 한국사회체육학회 2018 한국사회체육학회지 Vol.0 No.73

The aim of this study is to compare and analyze the body composition, leg strength and cardiovascular variable for the elderly who are in residential aged care facilities according to sex and age. A total of sixty-nine subjects between 65 to 85 who inhabit in Silver Tower, fee charging facilities for the elderly, were invited to participate. Four groups were formed; a young-old men Group (YMG, n= 31), a young-old woman Group (YWG , n = 22), an old-old men Group (OMG, n= 8). Variables of Body composition (Ht, Wt, BMW, BF, BF%, BMI)were measured through Bioelectrical Impedance Analysis(BIA). Variables of leg strength (60%PTFx, 60%PTEt, 180%PTFx, 180%PTEt) were measured by isokineic devices Cybex 6000. Cardiovascular Variables (RHR, RSBP, RDBP, MHR, MSBP, MDBP) were measured through sub-maximal test applied by Modified Bruce Protocol. All data were expressed by using One-way ANOVA in order to compare between 4 groups. Significance level(a) was 0.05. Ht and BMW of body composition variables between groups showed that YMG and OMG were high. There was statistical significance according to sex (p<.05). BF and BF% from comparison between groups turned up higher for YWG and OWG. There was statistical significance according to sex as well (p<.05). BMI from comparison between groups turned up higher at YWG. There was statistical significance according to sex and age (p<.05). All data of cardiovascular variables showed that there was not statistical significance according to sex and age. 60%PTFx and 60%PTEt of all leg strength variables between groups showed that YMG and OMG were high. There was statistical significance according to sex (p<.05). It showed that there was no statistical significance in 60%PTFx and 60%PTEt of all leg strength variables between groups. In conclusion, it is expected that body composition and leg strength variables for the elderly are so different according to sex and age that the life expectancy of the elderly will increase more. The more detailed studies are needed in future.

골프 드라이버 저탄도 스윙의 운동역학적 분석

유오선(Ryou, O-Sun),변용현(Byun, Yong-Hyun) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.4

The purpose of this study is to quantitatively present the efficient actions upon low trajectory swing by analyzing the difference in between golf driver low trajectory swing and normal trajectory swing with kinematic variables and provide the basic data required to make the low trajectory when performing golf swing. In order to achieve this objective, departure angle and amount of ball spin were analyzed by using the device to measure ball quality with four female golf players belonging to KLPGA. The kinematic analysis of each event was analyzed through three-dimensional video analysis and the potential of major muscles in each event was analyzed by using the EMG. The following conclusions were obtained. Taken all together, it is thought to play a role as the important factor if the body center is placed in the direction of progression upon low trajectory swing, changes of knee joint and hip joint are smaller than those in normal trajectory and effectively use the right side of biceps brachii and deltoid muscle upon back swing and down swing.