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염유식,박찬웅 서울대학교 사회발전연구소 2007 Journal of Asian Sociology Vol.36 No.1
This paper tried to examine the relationship between social network patterns and physical health statuses among junior high school students in Korea with three distinctive characteristics with compared to many previous studies. First, based on two-year panel data of Korean Youth Panel Survey, it tried to control for unobserved heterogeneity that might have been exerting effects on students’ health but could not have been included in the survey. Furthermore, instead of typical random model of anel data, it employed a modified random model that examined each coefficient to decide if we could treat ‘between’ effect same as ‘within’ effect. Thanks to this modified model, we could detect getting along with friends at school had only ‘between’ effect without statistically significant ‘within’ effect. Lastly, by including self-perceived psychological problem in the regression, we examined the possibility of direct network effects on physical health. The results revealed that in each of three social dimensions (school, family, and friends) direct effects of network existed on physical health of junior high school students. Especially, cohesive and frequent interacting with friends rather than simple popularity among friends was closely related with physical health.
염유식,이병규 한국사회학회 2010 한국사회학회 사회학대회 논문집 Vol.2010 No.12
5,728 bills were proposed by cosponsoring legislators during 17<SUP>th</SUP> Korean National Assembly. Based on the score for broker position of each legislator is calculated from co-sponsorship networks, this paper examines the effects of brokerage on the adoption of bills. Unlike many studies that confirmed consistent benefits of brokers in economic situation, we find it was not always the case in political sphere. The benefit of brokers is dependent on both broker types and the extent of political tension. Depending on these two factors, brokers sometimes even got penalty not benefit. First, the effect of each brokerage is biggest when the political confrontation is medium. In other words, if political confrontation is too weak or too strong, the change in brokerage score does not change the adoption rate a lot. When political conflict is too low or too high, there is little room for brokers. Brokers need moderate level of confrontation in order to obtain benefit from brokerage acts. If confrontation is too weak, parties do not need brokers. They can persuade other legislators to adopt bills they want without brokers’ help. If confrontation is too strong, parties do not want brokers: brokers are treated as opportunistic. Second, when we compare the size of the effects between different types of brokerage, inside and in-and-out brokerage produces the best results. We can conclude that in order to get maximum benefit out of broker positions, you need to bridge two legislators at least one of whose party membership is identical to yours.
염유식,주원탁 한국사회조사연구소 2014 사회연구 Vol.15 No.1
Systematic review of Barth and colleagues on the studies of social support and coronary heart diseases(CHD)(Barth, Schneider & Von Känel, 2010) have examined the effects of two types of social supports: functional and structural. The authors have concluded that functional social support was proved to be effective while there was no robust evidence for the influence of structural social support. The goals of this study were: 1) to re-examine Barth’s analysis for structural social support with more refined types of structural social supports - marital status, living alone, social network size, social engagement and composite index of structural social support - and 2) to review more recent articles about social support and CHD. Meta-analyses were performed by each type of structural social support from the total of 44 prospective studies - 25 from Barth’s review, and 19 new studies on social support and CHD. The results showed enough evidence for the effects of functional social support on CHD but not in the case of structural social support, which confirmed previous conclusion of Barth. This conclusion does not override the effects of structural social support, and more elaborated measures of social network structure are waiting to be tested in future studies.