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도시 거주 여성 노인의 비만 유무에 따른 신체구성, 상⋅하지 근력 및 신체활동 능력 분석
최승준,Choi, Seung-Jun 대한고유수용성신경근촉진법학회 2021 PNF and Movement Vol.19 No.3
Purpose: The purpose of this study was to investigate the differences in body composition, upper and lower limb muscle strength, and functional physical ability in urban-dwelling elderly women with or without obesity. Methods: All study participants were assigned to the normal weight group (n=8, BMI<25) and the obesity group (n=7, BMI>25) based on their obesity rate. Anthropometric measurement was conducted and body composition was measured. For the upper and lower limb strength, grip strength and maximal isometric knee extension and flexion were evaluated by a dynamometer. The senior fitness test was performed to measure functional ability. Data analysis was conducted by the independent t-test and the alpha level was set at 0.05. Results: The waist, hips, and thighs of obese elderly women were thicker than those of normal-weight elderly women. This physical difference resulted from body fat mass, not muscle mass. Despite a similar level of limb muscle mass between the two groups, the upper limb grip strength was higher (24.00% for left, 19.95% for right) in the normal-weight women than the obese women (p<0.05), but otherwise there was no difference in maximal knee flexion or extension isometric strength. Functional physical ability showed no difference in a 30-second chair sit and stand test and a six-minute walk test, but a 30-second arm-curl (11.00% for left, 14.81% for right), back stretch (8.54cm for left, 8.99cm for right), chair sit and reach (9.22cm for left, 6.24cm for right), and 2.44 meter round trip walk (0.62 sec, 9.39%) were faster in performance for normal-weight elderly women than obese elderly women (p<0.05). Conclusion: Taken together, despite similar levels of upper and lower extremity muscle mass, normal-weight elderly women showed higher performance in upper limb strength, flexibility, and agility than obese elderly women, but there was no difference in lower extremity functional muscle strength and cardiopulmonary endurance.
최승준(Seung-Jun Choi),박송영(Song-young Park),곽이섭(Yi-Sub Kwak) 한국생명과학회 2015 생명과학회지 Vol.25 No.11
운동에 종사하는 엘리트 운동선수나 동호인들은 지속적인 같은 동작의 반복, 잦은 경쟁스트레스의 경험, 그리고 신체적인 컨디션이 좋지 않은 상황에서의 과도한 훈련의 요구 때문에 근육, 건, 인대, 염좌 및 골절과 같은 부상을 비롯한 근골격계 질환을 야기한다. 그리고 과도한 오버리칭, 경쟁불안으로 인한 스트레스, 및 피로회복의 부족 등으로 운동기술의 정체를 비롯한 운동수행력의 감소는 물론 심리적인 스트레스와 면역반응의 감소를 경험하게 된다. 따라서 본 연구에서는 과훈련증후군의 원인과 증상 및 치료와 처치에 대해 분석하고 이러한 증후군과 면역반응과 연관성을 비교 및 분석하여 운동 동호인을 비롯한 운동 선수들에게 나타날 수 있는 면역력의 감소를 줄여, 운동수행력의 증진은 물론 건강유지와 면역력 회복을 도모하고자 한다. 본 연구의 목적을 달성하기 위해 본론에서는 과훈련 증후군에 대한 전반적인 내용을 실험연구를 비롯한 관련 연구논문을 중심으로 분석하였고, 아울러 과훈련 증후군과 면역반응 및 알레르기 면역반응과의 연관성에 대해 면밀한 분석을 실시하였다. 본 연구 결과를 토대로 많은 스포츠 현장에서 과훈련증후군에 관한 실험적인 연구와 면역반응 및 알레르기반응과의 연관성 분석을 토대로 한 실험적 연구가 진행되어야 할 것으로 여겨지며, 본 연구가 많은 운동선수들과 동호인들의 건강관리는 물론, 면역력의 증가를 도모하는 데에 도움을 줄 것으로 여겨진다. The present study was performed to analyze and review the physical and immune responses to overtraining syndrome in humans. Overreaching refers to the initial phage of overtraining syndrome and has been known as a physical fatigue which is mainly from metabolic imbalance. It has been known that overtraining also results in a loss of adaptability which may lead to an attenuation of exercise performance, sleeping disorder, central fatigue, neurohormonal changes, difficulty recovery to physical stress, and immunological changes. Additionally, overtraining syndrome is characterized by persistent fatigue, poor performance in sport due to the prolonged and strenuous physical training. Also, previous studies reported that endurance athletes experienced a high incidence of URTI during intense training and the post training. And also, high–performance athletes reported that suppression of cell mediated and anti-body mediated immune function. NK cell numbers were also reduced in the period of overtraining syndrome. Major components of prevention and treatment for the overtraining syndrome are screening, education, and detraining. Furthermore, the combination of these prevention and treatment strategies will be much helpful. Therefore, the current review will be helpful for athletes and individuals who are at the risk of overtraining syndrome.
최승준(Seung-jun Choi),박제원(Jae-Won Park),김종배(Jong-Bae Kim),최재현(Jae-Hyun Choi) 한국디지털콘텐츠학회 2014 한국디지털콘텐츠학회논문지 Vol.15 No.4
According to the evolving of IT technologies, the amount of data we are facing increasing exponentially. Thus, the technique for managing and analyzing these vast data that has emerged is a distributed processing system of big data. A quality evaluation for the existing distributed processing systems has been proceeded by the structured data environment. Thus, if we apply this to the evaluation of distributed processing systems of big data which has to focus on the analysis of the unstructured data, a precise quality assessment cannot be made. Therefore, a study of the quality evaluation model for the distributed processing systems is needed, which considers the environment of the analysis of big data. In this paper, we propose a new quality evaluation model by deriving the quality evaluation elements based on the ISO/IEC9126 which is the international standard on software quality, and defining metrics for validating the elements.
Ni-MH 2차 전지용 Zr 계 수소저장합금전극의 특성에 미치는 치환원소 (Co, Cr, Fe) 의 영향
최승준(Seung Jun Choi),정소이(So Yi Jung),서찬열(Chan Yeol Seo),최전(Jeon Choi),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1999 한국수소 및 신에너지학회논문집 Vol.10 No.3
Effects of alloy modification with the Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub> alloy for an electrode use have been investigated. For the alloy composition, a part of Mn was substituted by Co, Cr and Fe. The experimental results showed that Co accelerated activation of alloy, and Fe and Cr improved the discharge capacity. These results agree with P-C-T curves of each alloy. But substituting Fe for Mn showed the decrease of the discharge capacity when discharged at high rate (60㎃, about 1C rate). Considering both the discharge capacity and the high rate discharge property, Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub> alloy was found to be the best alloy among the alloys subjected to the test.
Ni-MH 2차 전지 전극용 Zr-Ti-V-Ni-Mn 계 수소저장합금의 조성에 따른 전기화학적 특성
최승준(Seung Jun Choi),정소이(So Yi Jung),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1999 한국수소 및 신에너지학회논문집 Vol.10 No.4
Effects of alloy modification for the Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub> alloy as an electrode materials have been investigated. When Ti in the alloy was partially substituted by Zr, the hydrogen storage capacity and subsequently the discharge capacity increased significantly, however, the activation characteristic and rate capability decreased. By substituting Mn with other elements (Cr, Co and Fe) in the alloy, discharge capacity decreased but the cycle life and rate capability were improved. Considering both the discharge capacity, the high rate discharge property and cycle life, the Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub> alloy among the alloys subjected to the test was found to be a prominent alloy for a practical usage.
Zr-2.5Nb 압력관에서의 Striation Spacing과 DHCV의 관계
최승준(Seung Jun Choi),안상복(Sang Bok Ahn),김성수(Sung Soo Kim),임경수(Kyoung Soo Im),김영석(Young Suk Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
The objective of this study is to elucidate a relationship between striation spacing and DHCV in Zr-2.5Nb tubes. To this end, DHC tests were conducted at different temperatures ranging from 100 to 300 oC with 3 to 6 data set at each test conditions for data confidence. Hydrogen charging amount was determined with testing temperature, from 27 to 87 ppm. Before applying load, specimens were heated up in order to dissolve hydrogen into matrix, and cooled down to testing temperature. From the results, DHCV and striation spacing increased with increased testing temperature, leading to a apparent relation that striation spacing became larger with increased DHCV. However, through a normalization of DHCV by diffusivity and solubility of hydrogen, it is found that the DHCV decreased with increased striation spacing. This correlation of the striation spacing and the DHCV was confirm through DHC tests on irradiated Zr-2.5Nb tubes with higher yield strength demonstrating the higher DHCV with the smaller striation spacing.