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2P-121 Mechanical and thermal properties of polyamide 66/PPA composites
최필성,김재익,류승훈 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Researches have been actively carried out to replace metals with plastics in order to improve the performance and weight lightening of automobiles and electronic devices. Polyamide 66 is one of the most used engineering plastics due to their excellent mechanical and thermal properties. Polyphthalamide (PPA) consists of aromatic structure, having better mechanical and thermal properties than polyamide 66. This study was investigated on mechanical, thermal properties, and morphology of composites with different weight percents of PPA.
수도권 신도시 내 도시철도 개통에 따른 주택가격 변화 - 광교신도시 사례 -
최필성,현동우 한국부동산원 2022 부동산분석 Vol.8 No.1
The purpose of this study was to examine the effect of the opening of a new route for urban railway on the changes of housing prices in new cities in the Seoul Metropolitan area. The empirical analysis was targeted on Gwanggyo New Town, where the Shinbundang Line was opened in 2016. The difference-in-differences method was used on the basis of actual market prices for about4,800 units of apartments in Gwanggyo New Town for three years around the opening of the Shinbundang line. The empirical analysis demonstrated that the opening of the Shinbundang line increased apartment prices up to 12.7% within 600 meters of a subway station by walking distance. Price effects turned out to be more evident two years after the opening of a new route for urban railway and showed a pattern that was stronger in the mid- to long-term than in the short-term. The study also showed that the estimation of price effects turned out to be more significant results such as clear distance attenuation on a spatial pattern when walking distance was used instead of straight line distance on the map. In addition, the application of difference-in-differences analysis tended to decrease the risk of distorting the estimation of the effectsfor accessibility improvement than the cross-sectional analysis that did not take into account the trend of housing prices. 본 연구는 도시철도 신규 노선의 개통이 수도권 신도시 내 주택가격 변화에 미치는 영향을 살펴보고자 하였다. 실증분석은 2016년 신분당선이 개통된 광교신도시를 대상으로 하였고, 신분당선 개통 전후 3년간 광교신도시에서 거래된 4,800여 개의 아파트 실거래가격에 기반하여 이중차이분석을 적용하였다. 실증분석 결과, 신분당선 개통은 도보거리 기준 전철역 600m 이내에서 아파트가격을 최대 12.7%까지 상승시키는 효과가 있는 것으로 나타났다. 가격효과는 개통 2년 후부터 뚜렷하게 나타났으며, 단기보다는 중장기적으로 더욱 강해지는 패턴을 보였다. 실증분석 결과는 또한 지도상 직선거리가 아닌 도보거리를 활용할 경우, 가격효과의 추정이 공간적 패턴에서 뚜렷한 거리감쇠 형태를 나타내는 등, 더 유의미한 결과를 보이는 것으로 나타났다. 또한, 주택가격의 추세가 고려되지 않은 횡단면 분석의 적용에 비해 이중차이분석을 적용할 경우, 도시철도 신규 노선 개통으로 인한 접근성 개선 효과를 왜곡 추정할 위험성을 낮추는 것으로 나타났다.
AHP 프로그램을 이용한 자동차 구매 의사결정시 그룹토의가 의사결정에 미치는 영향에 관한 이문화 비교 연구
최필성,주원 대한안전경영과학회 2013 대한안전경영과학회지 Vol.15 No.1
In the trend toward globalization, cross-cultural teams in organizations are becoming more and more common. In particular, the influence of China and Western Europe on the global economy is getting increased. With this trend, it is important to understand cross-cultural characteristics for group decision making in managerial environments. This study aims at analyzing cross-cultural differences between China and Western Europe in light of the effect of group discussion in group decision making. An experiment simulating a decision of a car purchase was conducted. A total of 48 subjects (24 Chinese and 24 Western Europeans) assigned in decision groups were asked to judge relative importance ratios of nine factors affecting their purchase decisions using the AHP program developed for the experiment. Three dependent variables (consistency, satisfaction, and consensus) were measured. Chinese were slightly more consistent than Western Europeans in discussion-involved group decision making. In terms of decision satisfaction, Western Europeans were more satisfied with discussion-included decisions than discussion-excluded decisions. Chinese, on the contrary, did not show a significant difference. There was no significant difference between two cultures in decision consensus.
최필성 대한건축학회 2003 대한건축학회논문집 Vol.19 No.11
The paper deals chiefly with universalization and colonization of architecture in Japan and Australia between the period of 1950s and the 70s. Walter Gropius' attempt to propagandize American Modernism in Japan is defined here as a colonizing act which had unprecedented impact on the following trends in Japanese architecture headed by Kenzo Tange and the Metabolists. In the process of universalization of Japanese architecture, however, an Australian critic, Robin Boyd, was in the frontline to represent Japan with his influential publications in world standard. Boyd's contribution of Japanese architecture to western world also influenced his own stance in Australian architecture by suggesting the Modern Movement as the status quo, which in turn was a status of colonization per se.
최필성,배한나,김재익,( A. M. Shanmugharaj ),류승훈 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Polyamide 6,6는 물리적 특성, 내열성, 내마모성, 내약품성 등이 우수한 고분자 이다. 그러나 우수한 기계적 물성에 비해 내충격성이 약한 단점을 가지고 있다. 이러한 내충격성을 보강하기 위해 glass fiber, carbon fiber를 첨가한 복합재료가 적용되고 있으나 polyamide 6,6의 약한 toughness의 개선에는 한계가 있어왔다. 따라서 본 연구에서는 toughness를 개선하기 위해 반응성 수지를 첨가, alloy 화하여 압출 및 사출을 거쳐 시험편을 제작하였다. 제작된 시험편은 UTM을 이용하여 기계적 물성을 평가하고, FE-SEM을 이용하여 모폴로지와 기계적 물성과의 상관관계를 확인하고, 유변학적 특성을 연구할 예정이다.
최필성,주원 대한안전경영과학회 2013 대한안전경영과학회지 Vol.15 No.1
In the trend toward globalization, cross-cultural teams in organizations are becoming more and more common. In particular, the influence of China and Western Europe on the global economy is getting increased. With this trend, it is important to understand cross-cultural characteristics for group decision making in managerial environments. This study aims at analyzing cross-cultural differences between China and Western Europe in light of the effect of group discussion in group decision making. An experiment simulating a decision of a car purchase was conducted. A total of 48 subjects (24 Chinese and 24 Western Europeans) assigned in decision groups were asked to judge relative importance ratios of nine factors affecting their purchase decisions using the AHP program developed for the experiment. Three dependent variables (consistency, satisfaction, and consensus) were measured. Chinese were slightly more consistent than Western Europeans in discussion-involved group decision making. In terms of decision satisfaction, Western Europeans were more satisfied with discussion-included decisions than discussion-excluded decisions. Chinese, on the contrary, did not show a significant difference. There was no significant difference between two cultures in decision consensus.