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선경호(Kyung Ho Sun),김윤영(Yoon Young Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
This research is concerned with the structural optimization of multiferroic materials for maximizing the magnetoelectric effect. Multiferroic composites, made of combining piezoelectric and magnetostrictive materials, can exhibit an extrinsic magnetoelectric effect due to elastic coupling interactions between piezoelectric and magnetostrictive phases. Recent experimental results (Zheng et al 2004 Science 303 661) have shown that a 1-3 type vertical heterostructure exhibits a strong magnetoelectric coupling effect. Motivated by this work, we aim to find the optimal configuration of multiferroic nanostructured composites by the topology optimization method. To predict the behavior of multiferroic composites, a fully coupled magneto-electro-elastic theory is used in the frame of the finite element method. The numerical results obtained by the present investigation were in agreement with the recent observations.
수퍼바이저와의 협동관계가 사회복지사(수퍼바이지)의 업무만족 및 소진에 미치는 영향
강선경(Kang Sun Kyung) 한국사회복지학회 2008 한국사회복지학 Vol.60 No.2
본 연구의 목적은 협동작업(Work Alliance)으로 개념화된 바와 같이, 사회복지 종사자의 업무만족(Working Satisfaction)과 소진(Burnout)에 관한 수퍼바이저와 수퍼바이지간의 협동관계(Corporative Relationship)의 효과를 탐구하는 데 있다. 이를 위해 서울과 경기지역에 위치한 종합 사회복지관 및 상담 센터를 중심으로 68명의 수퍼바이저와 80명의 수퍼바이지들을 대상으로 일련의 위계적 선형모형(Hierarchical Linear Model: HLM)을 이용하여 독립변수(수퍼바이저와 수퍼바이지간의 협동관계)가 종속변수(업무만족 및 소진)에 미치는 영향을 조사하였다. 연구결과, 수퍼바이지가 수퍼바이저에게 가진 친밀한 느낌이 그들의 업무만족과 관계가 있다고 나타났다. 그러나, 수퍼바이저와 수퍼바이지 간의 협동이 당연히 소진 정도를 낮추는 것과 연관되어서는 통계적인 유의미를 발견할 수 없었다. 또한 업무만족과 소진 간에는 반비례적인 부의 관계가 있음이 나타났다. 마지막으로 본 연구의 의의와 후속연구에 대한 시사점을 덧붙였다. The purpose of this study explored the effects of supervisory relationship, conceptualized as working alliance, on social workers' working satisfaction and burnout. The consented participants were 68 supervisors and 80 supervisees working at Social Service Centers located in Seoul and Kyung-ki Province. Hierarchical linear model analyses of survey results from supervisors (n=68) and workers (n=80) revealed that the workers' sense of rapport within the supervisory relationship is related to working satisfaction. While it was expected that the supervisory relationship would also relate to levels of burnout, no association was found in the analyses. However, strong negative correlations were found between the supervisees' feelings of rapport within the supervisory relationship and both emotional exhaustion and depersonalization. The implication of future research and of social work practice and policy were added.
외식 프랜차이즈 기업의 초기 가맹 비용 결정 전략이 가맹본부 수익성에 미치는 영향
선경아(Kyung-A Sun) 한국조리학회 2023 한국조리학회지 Vol.29 No.12
This study investigates the relationship between pricing strategies for initial fee decisions and franchisors’ profitability. As the restaurant industry is getting excessively competitive, it has been more difficult for the firms to make profits. In this market condition, franchising has become a useful governance structure for restaurant firms by enabling them to grow rapidly and improve financial performance. The current study aims to uncover the mechanism how initial fee decisions affect franchisors’ profitability, using the framework of pricing strategies. Panel data analyses by employing the secondary data show the results that (1) cost-based pricing strategy on initial fee decisions was not statistically significant, (2) competition-based strategy on initial fee decisions has a negative effect on profitability, (3) value-based strategy on initial fee decisions has a positive effect on profitability. Findings of the study provide implications to franchising and restaurant management literature as well as industry practitioners.
남부지역의 태양열이용 열펌프식 온수.난방시스템의 실증연구 분석
선경호(Sun, Kyung Ho),김기선(Kim, Ki Sun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
The goal of this study is to measure and compare the performance of solar heat pump for room and hot water heating. To accomplish the goal, solar heat pump with alumium roll bond type evaporator and indoor heat exchanger(condenser) was built and fully instrumented with thermocouples and pressure transducers etc. The test results showed that the COP(coefficient of performance) of HFC-134a(CF₃CH₂F) were higher than those of CFC-12(CF₂Cl₂). One stratospherically safe new refrigerant is 1,1,1,2-tetrafluoroethane(HFC-134a), which is thermodynamically similar to CFC-12 and considered to be a potential direct replacement for CFC-12 in air-conditioning and refrigeration applications. The solar heat pump system for room heating was designed to show the best efficiency that the room temperature make 18{sim}20?C and 23{sim}25?C in the southern part of South Korea during November, December, and January.