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김영근 ( Young Guen Kim ),양정민 ( Jeong Min Yang ),김재현 ( Jae Hyun Kim ) 한국보건행정학회 2021 보건행정학회지 Vol.31 No.4
Background: The purpose of this study was to identify the association between participation in social activities and mortality rates for those aged 45 aged and older in Korea. Methods: In this study, the 1st to 6th Korea Longitude Study of Aging was used to analyze 10,217 people excluding missing values among middle and old age groups aged 45 or older. The scope of social activities was classified into “religious gatherings,” “religious gatherings,” “leisure/cultural/sports-related organizations,” and “clubs/hometowns/religious associations,” and analyzed using a chi-square test and Cox proportional risk model. Results: In the case of non-participating groups in religious activities, the mortality rate was 1.24 times higher (hazard ratio [HR], 1.24; p=0.000) than those of the participating group. The non-participating group of social gatherings had a 1.27 times higher mortality rate (HR, 1.27; p<0.0001) than the participating group. In addition, the mortality rate of non-participating groups related to leisure/cultural/sports was 1.79 times higher (HR, 1.79; p=0.000). The mortality rate of the group that did not participate in the alumni association/festival/folklore society was 1.51 times higher than that of the participating group (HR, 1.51; p<0.0001). As a result of correcting the control variable to analyze the relationship between the number of participants in social activities and the mortality rate, the mortality rate of the group participating in one or less social activities was 2.26 times higher (HR, 2.26; p<0.0001) compared to the four or more social activity participating groups, and the mortality rate of the 1-3 social activities was 1.64 times higher (HR, 1.64; p<0.0001). Conclusion: As a result of the study, it was found that participation in social activities of the middle-aged and elderly groups was effective in reducing mortality, and in particular, it was found that there was a strong relationship with mortality in less than one social activity group. Therefore, it is intended to provide an academic basis for lowering the mortality rate of the group in line with the continuous improvement of domestic social activity participation conditions, and through this, this study can be expected to serve as a policy and institutional basis for lowering the mortality rate of the group.
박우진(Woo-Jin Park),김일현(Il-Hyun Kim),조해용(Hae-Yong Jo),김영근(Young-Guen Kim),안길영(Kil-Young Ahn) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
A low voltage DC(Direct Current) circuit breaker is an electric control device that interrupts the abnormal currents which result from the over-loads or short-circuits in a low voltage(less than 1,500Vdc) distribution line. Recently, higher current breaking performance has become crucial in providing the reliability for the modern devices requiring small scale and high performance. When a short circuit occurs, a fault current flows between contacts of DC circuit breaker even though they are separated by the protective control system. Arc voltage between contacts of circuit breaker should generate as high as possible during breaking phase. High arc voltage could lead the main circuit to zero arc current so that arc plasma is eliminated. Based on this behavior, arc extinction system of a circuit breaker should be designed for increasing arc voltage during breaking period of the current. Since DC does not have current zero point, it can be more difficult and important to secure the breaking performance. There are conventional methods that are widely known as arc extinction methods and most of them involve method for increasing arc voltage. In this paper, experiments and CAE analysis were carried out to find out the criteria of the arc extinction and to verify the validity of methods of extinguishing an electric arc.
한태준,김영근 경성대학교 2001 論文集 Vol.22 No.1
This study was to find out the influence of the 「health-clapping discipline」 upon the changes of the state-trait-anxiety level and the emotion level, reaction time, and the changes of the stable heart rates. Two groups were organised ; one was discipline group and the other one was non-discipline group. And each group was arbitrary consisted of 30 students. The discipline group got the regular 「health-clapping discipline」 6 times a week for 8 weeks. Each training time is 15 minutes long. The non discipline group was allowed to do their daily lives without any special discipline program. After 8 weeks discipline period, their psychological and physiological changes were examined through di-dispersion analysys with independent parameters of group and time. The conclusions were as followings. 1. The「health-clapping discipline」feduced the level of the state and trait anxiety. 2. The「health-clapping discipline」 changed no emotional level. 3. The「health-clapping discipline」 had no relationship with the reaction time. 4. Heart rate showed the meaningful decline by「health-clapping discipline」.