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4라운드 골프가 대학골프선수의 체력 변인, 집중력과 동적균형능력에 미치는 영향
변용현,박우영 한국골프학회 2023 골프연구 Vol.17 No.4
[Purpose] The purpose of this study was to analyze the effect of the fourth round of golf in the summer on the fitness variables, attention, and posture control in collegiate golfers. [Method] The subjects who participated in this study consisted of 8 male golfers with 0 handicaps registered with the Korea Golf Association. The pre-test before the round was made up of fitness variables (weight, power, muscle strength, flexibility), attention and posture control, and the same test was 4 times after each round. [Result] As a result of the study, among the fitness variables, weight, power, and muscle strength decreased by the round, and flexibility was not difference but there was also a significant difference in attention. In addition, in the case of posture control, there was a significant decrease in the distance to reach the anterior, postero-lateral and postero-medial. [Conclusion] Continuous rounds in the summer have a negative effect on physical fitness, concentration, and posture control, so continuous physical training will be needed to control the best condition.
근감소 및 염증 예방을 위한 운동과 인터루킨(IL-interleukin)의 역할
변용현,박우영 한국응용과학기술학회 2018 한국응용과학기술학회지 Vol.35 No.2
The purpose of this study was myokine product and role with physical activity and literature review. There is accumulating epidemiological evidence that a physically active life plays an independent role in the protection against type 2 diabetes, cardiovascular disease, colon cancer, dementia and even depression. And myokine has been regarded an important factor of exercise training and brain growth factor for the prevention of Alzheimier's disease. During exercise the release of anti-inflammatory myokine from contracting muscle controled the metabolic response, and IL-4, IL-6, IL-7, IL-10, and IL-15 controled muscle hypertrophy, myogenesis and angiogenenesis. IL-6 promoted the lipid metabolism through AMPK activation. IL-1Ra, IL-10 and sTNF-R inhibited TNF-α as the pro-inflammatory cytokine. IL-15 increased the releasing volume from contracting muscle, and promoted the anabolic factor of muscle growth. IL-7 and IL-8 activated the angiogenesis through the more activation of C-X-C receptor signal transmission. 이 연구의 목적은 신체활동이 마이오카인 발현에 미치는 영향을 보고자 문헌고찰을 하였다. 신체적인 활동은 제2형 당뇨, 심혈관질환, 대장암, 치매 및 우울증과 같은 질환을 예방하는 역할을 하고 있다. 그리고 마이오카인(myokine)은 운동 훈련에 의해 분비되는 호르몬으로 뇌성장이나 알츠하이머 같은 질환 예방에 도움을 준다. 운동수행과정에서 수축하는 근육으로부터 분비되는 항염증 마이오카인의 생성과 대사 조절에 필요한 분비 활성화가 건강증진에 중요한 요인으로 보고 있다. 인체 골격근에서 분비되는 마이오카인 가운데 IL-4, IL-6, IL-7, IL-8, IL-15 등은 근육비대(hypertrophy)와 세포(myogenesis) 및 혈관생성 (angiogenesis) 등의 조절에 관여한다. IL-6는 AMPK 활성화로 인한 대사중 지방 산화를 촉진시키는 작용을 하고, IL-1Ra, IL-10 과 sTNF-R 는 염증성 싸이토카인 TNF-α의 분비를 억제한다. IL-15는 저항 운동시 근수축을 통한 발현량이 증가하어 근육 성장의 중요 합성요인으로 작용한다. 한편 IL-7 및 IL-8도 신호 전달 수용체 C-X-C를 통해 혈관신생을 촉진시킨다.
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.
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
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.
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.
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.