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청소년의 체중조절관련 건강신념과 운동효능감 및 운동지속의도가 신체활동에 미치는 영향
김기환(Kim, Gi-Whan),김정현(Kim, Jung-Hyun),홍광석(Hong, Kwang-Seok),정호진(Chung, Ho-Jin),정인경(Jung, In-Kyung) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.6
This study sought to examine whether physical activity level is associated with health belief-related weight control, exercise self-efficacy, and exercise adherence intention in Korean adolescents. As participants in the survey, a total of 652 male and female participants were recruited from junior high schools in Seoul. Statistical analyses were performed using SPSS Statistics program. The perceived benefit of health belief-related weight control was higher than other variables including perceived severity, barrier, and susceptibility in both genders. Female junior high school students were more susceptible to weight control behavior than male participants. In addition, the perceived benefit and barrier of weight control behavior were positively and negatively related to exercise adherence intention, respectively, in both male and female students. However, health belief was not correlated with physical activity level. These results indicate that positive health belief and weight control behavior may contribute to augmenting intrinsic motivation to exercise, but not genuinely increasing exercise participation. In contrast to health belief, the high level of exercise self-efficacy was found to be correlated with increases in exercise adherence intention and physical activity level. Therefore, education and guidance at home and in school are certainly required to establish desirable health belief and enhance exercise self-efficacy, which lead adolescents to maintain their healthy weight through regular physical activity.
정성필(Sung Pil Jung),이태희(Tae Hee Lee),김기환(Gi Whan Kim),윤소중(So Joong Yun) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
This paper presents a simplified finite element tire model for vehicle dynamics analysis. The classical finite element tire model was too big to simulate dynamic properties of the tire. In the simplified model, number of nodes of the tire model was dramatically reduced, and thus its simulation time was several times less than the classical model. Bead, carcass, belt which have an important role to the dynamic characteristics of tire were replaced by simple axis symmetric membrane elements. Also the rebar element was deleted. The tire model has been verified by comparing vertical stiffness data of the simulation model to the test data.