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타액오염이 트레이 레진 및 변연 형성재와 Polysulfide 인상재의 접착력에 미치는 영향
김용학,양홍서,Kim, Yong-Hak,Yang, Hong-Seo 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.5
This study was investigated to compare the bond strength of polysulfide adhesive between tray resin and border molding materials and to evaluate the effect of saliva contamination on them. We made the 135 resin tray secimens with a dimension of $1{\times}1{\times}1cm$ and divided them into 3 groups by the materials 1) Quicky group, 2) Compound group, and 3) Impregum group Each group was subdivided by saliva contimination. Group S1 : applied adhesive without saliva contamination Group S2 : applied adhesive after drying 15seconds after saliva contamination Group S3 : applied adhesive no after saliva contamination. Tensile tests were performed with a Universal Load testing machine. Results showed Impregum group significantly higher bond strength than Quicky group, but there was no significant difference in adhesive bond strength between Compound group and Quicky group in experimental group by materials In experimental group by saliva contamination, S1 group is significantly higher bond strength than S2 group and S2 group is significantly higher bond strength than S3 group in Quicky group and S1, S2 group is significantly higher bond strength than S3 group in Compound group and Impregum group. Impression compound and Impregum F which are usually used as an individual tray border mold-ing material can be said to be satisfied in adhesive bond strength to polysulfide impression materials. After try-in and clinical adjustment are performed, a custom tray should be properly rinsed and air dried before tray adhesive was placed.
김용학(Yong-Hak Kim),윤호영(Ho Young Yoon) 한국인구학회 2013 한국인구학 Vol.36 No.3
본 연구는 결혼정보회사의 자료를 통해 결혼 시장에서의 가치가 어떻게 교환되는지를 탐색한다. 남녀는 각각 어떤 속성을 지닌 상대방과 결혼하고 싶어 하고, 결혼 상대를 탐색하는 만남의 과정에서 상대에 대한 호감은 어떤 조건에서 생겨나는지 살펴본다. 또한, 결혼에 성공하는데 중요하게 작용하는 조건은 무엇이며, 실제로 결혼에 성공한 경우 부부간의 경제력, 외모, 학력, 출신지역 등이 어떻게 엇물리는지를 분석한다. 분석 결과에 따르면, 남녀가 선호하는 결혼 상대자의 특성은 상호 비대칭적인 것으로 나타나, 여성은 남성의 높은 소득을 선호하고, 남성은 여성의 예쁜 외모를 선호하였다. 그러나 실제 결혼 사례들을 보면 남성은 자신의 외모등급보다 낮은 외모 등급을 받은 여성과 결혼하는 반면, 여성은 자신보다 소득이 많은 남성과 결혼하여 선호달성의 비대칭성이 나타났다. 이러한 결과를 바탕으로, 결혼에서 남성의 소득과 교환되는 재화를 분석한 결과, 여성의 인상등급이 높을수록 그리고 여성의 신장이 클수록 높은 연봉의 남편과 결혼한 것으로 나타났다. This study examines personal value exchange in marriage market. The data from marriage information company is used for this purpose. The purpose of our research is to reveal 1) personal attributes that are considered as important when people enter marriage market; 2) which personal attributes brings good feelings when people are dating; 3) whether those important factors increase the probability of marriage; and when couples are married, 4) whether systematic trends of homogamy or heterogamy is presented with relation to income, appearance, education, and region. Our analysis shows an asymmetry between male and female. While females want to marry male with high level income, males want to marry female with good appearance. However, the actual pattern of marriage shows that males fail to get their wants whereas females indeed marry males with higher level of income than the females. This result has led our final analysis of value exchange in marriage that has found the increase in income of husband is associated with the increases in female"s height and the level of appearance.
한일 비교 연구의 비교: 인문사회 분야 논문 키워드 연결망 분석을 중심으로
김용학 ( Yong Hak Kim ),유소영 ( So Young Yu ) 연세대학교 사회과학연구소 2013 社會科學論集 Vol.44 No.1
This paper compares comparative studies of Korea and Japan conducted in each country from a perspective that knowledge and interest are socially constructed. To identify and compare the research trends and knowledge structures in the literature, we collected nine hundred and six hundered comparative papers published in Korea and Japan respectively in humanities and social sciences areas. From the title of these papers, we constructed keyword “co-occurrence networks” and compared their structure. We found that Korea and Japan shared some research topics, but differed significantly in research interests. First, comparative papers in Korea emerged much earlier than in Japan, whereas Japan began to develop their interests in Korea after 2002 World Cup. Secondly, when Korean papers compared Korea and Japan, they tend to compared them in a larger international context as to include U.S., China, or other advanced countries. Korean scholars in short compare two countries to benchmark Japanese systems from a global perspective. Japanese on the other hand tends to focus on a comparison of educational systems, welfare system and everyday behavior in two countries.
김용학(Kim Yong Hak),윤정로(Yoon Jung Ro),조혜선(Cho Haesun),김영진(Kim Yung Jin) 한국사회학회 2007 韓國社會學 Vol.41 No.4
과학적 지식을 생산하는 공동연구 연결망은 과학자들의 의사소통 및 지식확산의 중요한 기제가 되고, 연결망의 구조적 특성은 연구성과에도 영향을 미칠 가능성이 있기에 중요한 연구의 대상이 되어왔다. 본 연구는 한국 과학자들 사이의 공동연구 연결망이 서구와 마찬가지로 ‘좁은 세상’의 특징을 지니며 전공 분야별로 연결망 구조에 차이가 있는지, 그리고 좁은 세상 연결망에서의 과학자 위치가 그의 연구 생산성과 어떤 관련이 있는지를 분석한다. 본 연구는 과학자들의 공동연구자 수가 대부분의 좁은 세상의 연결망에서처럼 멱함수 형태로 분포되어 있으며, 경로거리는 무작위 연결망에서의 그것과 비슷하고, 군집계수는 높게 나타나는 ‘좁은 세상’의 구조를 보인다는 점을 발견했다. 연결망의 구조적 특징은 연구 분야별로 다르게 나타난다. 대표적인 예로서 BT 분야는 포괄적이고, IT 분야는 분절적이라는 사실을 발견했다. 또 공동연구 연결망에서 징검다리 역할을 하거나 연결망의 중심에 놓인 연구자들의 연구 생산성이 높다는 사실도 발견했다. 다양한 전공분야에서 생산되는 새로운 지식과 정보를 접하는 데 유리한 구조적 위치에 놓인 과학자의 연구생산성이 나타난 것이다. Research on the network structure of scientific knowledge production has become a main concern, since it enables us to discern the structure of communication and knowledge diffusion among scientists. This study examines if the scientific collaboration network in Korea reveals the characteristics of the "small world" as in the Western scientific community and identifies the structural differences across he subfield of scientific research. We also attempt to identify the effect of network locations on scientific performance. We found that the collaboration network among Korean scientists can be characterized as a small world network, where the degree distribution fits the power aw, the path distances are close to the random network, and the clustering coefficient s much higher than that expected in the random network. There are structural differences across research fields; for instance, the network in Bio Technology area s inclusive, whereas the network in Information Technology is segmented. We also found that researchers who are the bridges or who are at the center of the network ire more productive. This confirms that the position in the collaboration network s associated with scientific productivity.