• Progress in Superconductivity
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• 제13권2호
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• pp.127-132
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• 2011

Many research groups have been manufacturing coated conductor by various processes such as PLD, MOD, and MOCVD, but the methods with production cost suitable for wide and massive application of coated conductor did not develop yet. Spray pyrolysis method adopting ultrasonic atomization was tried as one of the possible option. GdBCO precursor films have been deposited on IBAD substrate by spray pyrolysis method at low temperature and converted to GdBCO by post heat treatment. Ultrasonic atomization was used to generate fine droplets from precursor solution of Gd, Ba, and Cu nitrate dissolved in water. Primary GdBCO films were deposited at $500^{\circ}C$ and oxygen partial pressure of 1 torr. After that, the films were converted at various temperatures and low oxygen partial pressures. C-Axis oriented films were obtained IBAD substrates at conversion temperature of around $870^{\circ}C$ and oxygen partial pressures of 500 mtorr ~ 1 torr in a vacuum. Thick c-axis epitaxial film with the thickness of 0.4 ~ 0.5 ${\mu}m$ was obtained on IBAD substrate. C-axis epitaxial GdBCO films were successfully prepared by ex-situ methods using nitrate precursors on IBAD metal substrate. Converted GdBCO films have very dense microstructures with good grain connectivity. EDS composition analysis of the film showed a number of Cu-rich phase in surface. The precursor solution having high copper concent with the composition of Gd : Ba : Cu = 1 : 2 : 4 showed the better grain connectivity and electrical conductivity.

• 한국의류학회지
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• 제19권5호
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• pp.738-746
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• 1995

The purposes of this study were 1) to find out any significant relationships among genderlogy, gender identity of clothing, and attitudes toward unisex clothing, 2) to investi- gate differences in genderlogy, gender identity of clothing, and attitudes toward unisex clothing between female and male college students, 3) to understand the structual dimension of genderlogy. The theory of this study was Bem's androgyny sex role theory which suggested an individual's masculine and feminine sex role lied on separate lines rather than on a linear line. The research design was an ex post facto survey and the subjects were 222 female college students and 179 male students in Taejeon, Chungnam and Chungbuk province. Using the SPSS program, factor analysis, 1-test, Pearson correlation coefficient, and plot were calculated for statistical analysis. The findings of this study were summarized as follows: 1) The 1.test showed significant differences in genderloy, gender identity of clothing, attitudes toward unisex clothing between female and male college students. 2) There were significant relationship among genderlogy, gender identity of clothing, attitudes toward unisex clothing. 3) The moi or dimensions of genderlogy were found to be traditional sex role and equal sex roles. There were only moderate negative relationship between traditional and equal sex roles and these two dimensions affected differently on the gender identity of clothing, as well as the attitudes toward unisex clothing, therefore traditional sex roles and equal sex roles seemed to lie on separate lines, and the androgyny sex role theory was supported.

• 재무관리연구
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• 제25권1호
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• pp.141-176
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• 2008

본 연구는 기업도산절차의 목표라 할 수 있는 사후적 효율성(ex post efficient outcome) 을 분석한다. $1980{\sim}2004$년 기간중 구조조정을 신청한 기업을 대상으로 구조조정 종결 이후의 주식성과를 분석한 결과 종결 공시 이전부터 공시일까지는 대부분 양(+)의 AR을 보였으나, 공시일 이후에는 워크아웃을 제외하고는 음(-)의 반응을 보였다. 장기성과를 분석한 결과 워크아웃 종결기업의 경우 공시월 이후에 고성과(overperformance)의 특성을 보인 반면, 화의 및 회사정리 종결기업은 종결공시월 이전에는 고성과, 공시월 이후에는 저성과(underperformance)를 보였다. 시장모형기준 종결후 24개월 누적비정상수익률을 종속변수로 한 횡단면 분석에서는 자산감축비율과 주주집중도, 최대주주지분율이 높을수록 장기성과는 긍정적이었으나, 최대주주 변경은 부정적인 영향을 미치는 것으로 나타났다. 구조조정 수단별 성과측면에서는 워크아웃의 성과가 가장 우월하며, 구조조정 신청시 공시효과와 종결 이후의 장기성과에서 화의의 성과가 가장 취약함을 확인하였다. 구조조정 개시 및 종결공시효과에서는 회사정리의 성과가 가장 취약함을 확인하였다. 한편, 최대주주 변경기업은 변경되지 않은 기업에 비해 장기성과에서 유의한 저성과를 보였으며, 횡단면 분석에서도 최대주주 변경은 장기성과에 부정적 요인임을 확인하였다. 본 연구결과는 효율성과 수익성이 취약한 기업에 대한 구조조정 조기종결 판단시 M&A를 통한 조기 채무상환 가능성보다 경제적 독자생존 가능성에 대한 보다 신중한 판단이 필요함을 시사한다.

• 품질경영학회지
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• 제43권3호
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• pp.397-408
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• 2015

Purpose: Express mail service(EMS) supplied by 'Korea POST'is an international postal service which brings letters, documents and parcels to a destination abroad in the fastest and safest way. This service is in a tough competition with global companies such as TNT, FedEx, DHL or UPS. To build an effective strategy for being competitive, an intensive study on EMS service quality should be accomplished from a customer's perspective. Methods: Kano model and improvement gap analysis are used to categorize and prioritize EMS service quality attributes. A 5-point Lickert scale is employed to apply the Kano model and improvement gap analysis. Each quality attribute can be classified as weak in comparison with competitors, critical for improvement, or potentially competitive. Results: Price, on-time delivery and delivery quality are to be kept as is; fast delivery, parking convenience and staff expertise can be potentially competitive; and the other attributes are considered to be critical for improvement. Conclusions: Fast reimbursement and proper compensation when shipping items are lost or damaged are to be improved with high priority. Efforts to secure fast delivery, parking convenience and staff expertise are needed to be competitive in the future.

• 대한가정학회지
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• 제42권12호
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• pp.141-160
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• 2004

This study investigated the divorce and post-divorce adjustment of divorced men and women in their 20s and 30s and explored the sex differences. For this empirical analysis, the data was collected from 230 divorced men and women in their 20s and 30s who lived in the Seoul metropolitan area from Sep. 23rd to Oct. 20th, 2002. The questionnaire for the survey dealt with demographic information and other scales. The major findings of the research project were as follows: First, although men and women experienced a similar level of pre-divorce conflicts, women were more likely to want to divorce. Second, although women had worse physical and psychological condition and more difficult problems than men after divorce, women more readily accepted their divorce reality than men. Divorce was not the best but the second best way to escape from a bad marriage for women. The results of the current research are expected to contribute to the pre-marital preparation and divorce adjustment programs.

• 수산경영론집
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• 제41권1호
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• pp.73-91
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• 2010

The objective of this study is to examine the hedging effectiveness of shrimp futures market. Hedging effectiveness is measured by OLS model based on rolling windows. Analysis data are obtained from Kansai Commodities Exchange in Osaka and are weekly data of frozen shrimp futures and cash prices in the time period from July 9, 2003, to May 9, 2007. The empirical results are summarized as follows:First, the correlation coefficients between the nearby futures price changes and the cash(16/20) price changes are very low and have range from 0.141 to 0.208 values. Second, the minimum variance hedge ratios($\hat{\beta}$) are all statistically different from 0 at the 5% level and range from 0.0477 to 0.5039 values excluding Indian shrimps(26/30). Ex post hedging effectiveness, as measured by the coefficient of determination, $R^2$, is relatively very low and range from a low of 0.4% for west-south Indian shrimps(26/30) to a high 4.3% for Vietnamese shrimps(16/20). Third, ex ante hedging effectiveness, as measured by out-of-sample hedging period, is also very low and range from a low of -4.4% for west-south Indian shrimps(21/25) to a high of 3.4% for Vietnamese shrimps(16/20). This indicates that the shrimp futures market doesn't behave as risk management instrument of shrimp spot.

• 무역상무연구
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• 제67권
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• pp.163-186
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• 2015

This study attempts to analyze the trade costs of domestic firms utilizing the FTAs in terms of burden of expenses in managing the rules of origin. In doing so, we classify the managing costs of FTA rules of origin into three categories (that is, (i) ex ante costs from acquiring necessary information and building the infrastructure in the advance stage before the FTAs, (ii) the actual costs of the origin management in the application stage of FTA preferential treatment, (iii) ex post management cost in the preparation stage of origin verification) and perform a survey on the greater details on each category. Using the comprehensive results from the survey regarding domestic firm's use of FTAs, this paper also discusses the issues related to small and medium-sized firms and addresses the concerns involved with their managing costs of FTA rules of origin. Importantly, this paper emphasizes the importance of government supports to reduce inefficiency induced by the additional costs that domestic firms face in their use of FTAs and proposes the various policy implications regarding the managing costs of rules of origin.

• 한국정보통신학회논문지
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• 제13권2호
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• pp.207-214
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• 2009

본 연구에서는 결합상품 서비스 제공에 대한 경제적 이론을 분석한다. 먼저, 번들링의 부정 적 측면을 강조한 연구에 대해 분석한다. 그 다음에는 번들링의 경쟁중립적 효과에 대한 연구를 분석한다. 이는 번들링의 부정적 측면에 대한 반박이라 할 수 있다. 그 다음에는 번들링에 영향을 주는 주요 상환들을 정리하고 각 상황하에서 번들링의 제반 효과에 대해 분석한다. 번들링은 경쟁기업을 저지함으로써, 사회 전체의 효율을 떨어뜨리기는 하지만, 어떠한 경우에는 경쟁을 저지하는 역할을 수행하지 않고 오히려 후생을 증대시키는 역할도 한다. 마지막으로 순수번들링에 대한 허가기준, 동등접속의 요건 설정, 결합요금규제로서 할인율 제도, 사전규제와 사후규제, 그리고 요금적 정성 규제에서 약탈적 가격에 대한 기준 등 번들링에 대한 정책적 접근방안을 제시한다.

• 경영과학
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• 제33권4호
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• pp.51-64
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• 2016

The maximum weight of single stock in mutual fund is limited by regulations to enforce diversification. Under incomplete information with added constraints on portfolio weights, enhanced performance had been reported in previous researches. We analyze a weight vector to examine the effects of additional constraints on the portfolio's performance by computing the Euclidean distance from the in-sample tangency portfolio, as opposed to previous researches which analyzed ex-post return only. Empirical experiment was performed on Mean-variance and Minimum-variance model with Fama French's 30 industry portfolio and 10 industry portfolio for the last 1,000 months from August 1932 to November 2015. We find that diversification-constrained portfolios have 7% to 26% smaller Euclidean distances with the benchmark portfolio compared to those of unconstrained portfolios and 3% to 11% greater Sharpe Ratio.

• 산업경영시스템학회지
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• 제38권4호
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• pp.117-131
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• 2015

Conventional data envelopment analysis (DEA) models require that inputs and outputs are given as crisp values. Very often, however, some of inputs and outputs are given as imprecise data where they are only known to lie within bounded intervals. While a typical approach to addressing this situation for optimization models such as DEA is to conduct sensitivity analysis, it provides only a limited ex-post measure against the data imprecision. Robust optimization provides a more effective ex-ante measure where the data imprecision is directly incorporated into the model. This study aims to apply robust optimization approach to DEA models with imprecise data. Based upon a recently developed robust optimization framework which allows a flexible adjustment of the level of conservatism, we propose two robust optimization DEA model formulations with imprecise data; multiplier and envelopment models. We demonstrate that the two models consider different risks regarding imprecise efficiency scores, and that the existing DEA models with imprecise data are special cases of the proposed models. We show that the robust optimization for the multiplier DEA model considers the risk that estimated efficiency scores exceed true values, while the one for the envelopment DEA model deals with the risk that estimated efficiency scores fall short of true values. We also show that efficiency scores stratified in terms of probabilistic bounds of constraint violations can be obtained from the proposed models. We finally illustrate the proposed approach using a sample data set and show how the results can be used for ranking DMUs.