• 한국광학회지
• /
• 제13권4호
• /
• pp.319-323
• /
• 2002

Linewidth enhancement factor ($\alpha{-factor}$) 값이 2와 4인 두 종류의 1.55${\mu}m$ 다층양자우물(Multi-Quantum Well; MQW) 대면적 레이저 다이오드를 제작하였다. 제작된 레이저 다이오드의 far-field 측정 결과 $\alpha{-factor}$ 값이 4일 때 보다 2인 구조에서 반폭치(Full Width at Half Maximum; FWHM)와 필라멘테이션(filamentation)이 감소되었다. 주입전류의 증가에 따라 두 종류 모두 far-field의 FWHM의 증가 현상이 나타났고 이는 filament spacing이 감소하였기 때문으로 설명된다.

• 대한기계학회논문집B
• /
• 제24권11호
• /
• pp.1470-1477
• /
• 2000

Due to the ozone depletion and global warming potentials, some refrigerants(CFx and HCFCs) have been rapidly substituted. R410A is considered as the alternative refrigerant of R22 for the air-conditioners used a home and in industry. Experiments on the condensation heat transfer characteristics inside a smooth or a micro-fin tube with R410A are performed in this study. The test tubes 7/9.52 mm in outer diameters and 3 m in length are used. Varying the mass flux of the refrigerant and the condensation temperatures, the average heat transfer coefficients and pressure drop are investigated. It is shown that the heat transfer is enhanced and the amount of pressure drops are larger in the microfin tube than the smooth tube. From the heat transfer enhancement coefficient and the pressure penalty factor, it is found that the high heat transfer enhancement coefficients are obtained in the range of small mass flux while the penalty factors are almost equal.

• 대한가정학회지
• /
• 제45권7호
• /
• pp.131-140
• /
• 2007

The purpose of this study was to examine the influence of aesthetic surgery attitude, self-esteem and body image on clothing behavior. Subjects were 356 female college students in Seoul. The data obtained were analyzed by reliability analysis, factor analysis, correlation analysis, stepwise multiple regression analysis and t-test. The major results of this study were as follows: First, five factors of aesthetic surgery attitude were identified: risk tolerance of aesthetic surgery, need of aesthetic surgery, image improvement via aesthetic surgery, keeping the secret of aesthetic surgery, and others' expectation of aesthetic surgery. Second, significant relationships were found between body image and clothing behavior, and self-esteem and body-enhancement of clothing. Also, risk tolerance of aesthetic surgery, need of aesthetic surgery, and image improvement via aesthetic surgery had a significant correlation with clothing behavior. Third, the most important variable which affected the aesthetics and body-enhancement of clothing was body image. The entertainer imitation behavior of clothing was influenced by need of aesthetic surgery, body image, keeping the secret of aesthetic surgery, risk tolerance of aesthetic surgery, and image improvement via aesthetic surgery. Preference for luxury goods of clothing was influenced by need of aesthetic surgery and body image. Body-enhancement of clothing was influenced by body image, image improvement via aesthetic surgery, and self-esteem.

• 한국안전학회지
• /
• 제22권1호
• /
• pp.24-29
• /
• 2007

The effectiveness of a UV(ultra violet) disinfection system depends on the characteristics of the waste water, flow conditions, the intensity of UV radiation, the amount of time the microorganisms are exposed to the radiation, and the reactor configuration. The wast water flow conditions are important factors in the design of UV disinfection system from the point of enhancement view of UV disinfection. The turbulent energy intensity in the wake by the vortex shedding are effective for UV radiation. Therewith the effectiveness of vortex generator is considered as a enhancement of UV disinfection. The experimental results presented give important evidences and explain that it is possible to predict UV disinfection performance based on flow experiments. An experimental investigation of two types of the vortex generator is presented. The qualitative and quantitative evaluations of the wake are made by flow visualization using smoke wire method and the measurement of vortex frequencies in the wind tunnel. From the experiment, following results were obtained that the delta wing type vortex generator is more effective than circular type because of the higher vortex frequencies and the smaller drag.

• 복식문화연구
• /
• 제22권1호
• /
• pp.158-166
• /
• 2014

Apparel design is an economic activity to create values for users over the value chain of a product. In this paper, the contribution of apparel design is defined as the enhancement of users' perceived values by improving users' experience of products. In this context, the value of a product corresponds to compensation for experience or a promise for experience of a product. Experience can be sensory or psychological benefits to users. To evaluate the value of apparel design, the researcher identified and analyzed the apparel design parameters affecting users' experience and benefits of products such as macro-, micro-environmental factors, value chain factors, apparel designer factors, and user factors. For an analytical modeling of the values of apparel design, this paper introduces the concept of a utility function from economics. In economics, utility is a measure of desirability or satisfaction that can be correlative to need or desire. The measure of value can be found in the price which a user is willing to pay for the fulfillment or satisfaction of need or desire via the experience of a product.

• 한국도서관정보학회지
• /
• 제16권
• /
• pp.221-249
• /
• 1989

The purpose of this study is to analyze the factors influencing on the organizational changes of the university libraries. Results of the analysis, that is, factors that cause the library organization to change, are as follows 1. Changes in library size physical facilities, growth and diversity of library collections, change in personnel organization, role enrichment and faculty status for librarians, management pattern of library director, change in financial su n.0, pport. 2. Change in program : change in goals and objectives, expansion of service programs, enhancement of library functions. 3. Library automation : introduction and development of many library automation projects. 4. Introduction of information technology : development and distribution of computer and related software, telecommunication, and new media. 5. Changes in user needs : many-sided demands for collections, spaces, and services. 6. Many other environmental factors related to library organization.

• 한국컴퓨터정보학회논문지
• /
• 제14권6호
• /
• pp.143-152
• /
• 2009

본 논문에서는 ITA/EA 기능이 IT거버넌스에 미치는 영향을 분석하기 위해서, 조직에서 ITA/EA가 역할을 하고 있는 몇 가지 기능요인들을 도출하였다. 또한 이 요인들이 IT거버넌스에 미치는 영향을 실증적으로 분석하였다. 총 223개의 조직에 대한 설문조사를 통한 자료를 통계적으로 분석한 결과, 인프라 체계화, 의사결정 향상 그리고 IT 프로세스 및 지원 기능들이 IT거버넌스에 영향을 미치는 요인으로 나타났다.

• 기술혁신학회지
• /
• 제18권4호
• /
• pp.590-620
• /
• 2015

우리나라의 국가연구개발사업 투자규모와 연구성과의 양적수준은 증가하고 있으나, 성과활용 실적은 저조한 상황이다. 따라서 국가연구개발사업의 사업화에 영향을 미치는 요인에 관한 체계적인 파악과 분석은 매우 중요하다. 다만 선행연구들은 객관적인 데이터기반의 분석이 아닌, 주로 질적 연구를 중심으로 이루어져왔고, R&D투입요소와 산출물 간의 영향요인을 분석하는데 집중되어 왔다. 이에 본 연구에서는 부품소재산업경쟁력향상사업을 사례로 하여 국가연구개발사업의 연구성과, 연구주체유형, 정부지원규모, 과제유형, 연구자의 역량, 기술분야가 사업화에 미치는 영향에 대하여 객관적인 데이터를 기반으로 체계적으로 분석하고자 하였다. 분석결과, 특허성과와 정부지원규모, 기술분야 등의 요인들이 사업화성과에 영향을 미치는 것으로 나타난 반면, 논문성과와 연구수행주체유형, 과제유형, 연구자의 과제수행능력은 통계적으로 유의한 결과를 드러내지 못하였다. 따라서 향후 부품소재산업경쟁력 향상사업을 포함하여 국가R&D사업의 과제기획, 추진과정, 과제평가 등에서 사업화성과를 높이기 위해서는 투입과 결과 간의 인과관계를 보다 분석적으로 파악하여 과학적인 연구개발프로젝트 설계를 시도해야 할 것으로 판단된다.

• 유통과학연구
• /
• 제13권1호
• /
• pp.83-91
• /
• 2015

Purpose - Despite the structural irrationality of multi-level transportation and the oil price rise, the domestic freight transportation market continues to grow, mirroring the rise in e-commerce and resultant increase in courier services and freight volumes. Several studies on courier services have been conducted. However, few studies or statistics have been published regarding regular freight services although they have played a role in the freight service market. The present study identifies the characteristics of regular freight service users to seek competitiveness enhancement measures specific to regular freight services. Research design, data, and methodology - IPA is a comparative analysis of the relative importance of and satisfaction with each attribute simultaneously. This study used IPA because it facilitates the process of analyzing importance and performance, deriving implications and a visual understanding of results. To enhance the competitiveness of regular freight services, this study surveyed its current users regarding the importance of the regular freight service factors. A total of 200 copies of a questionnaire were circulated and 190 copies were returned. In addition to demographics, respondents answered questions about the importance of and satisfaction with services on a 5-point Likert scale. Excluding 3 inappropriate copies, 187 out of 190 copies were analyzed. PASW Statistics 18 was used for statistical analysis. A total of 20 question items were selected for the service factors presented in the questionnaire based on the 1st pilot survey and previous studies. Results - According to the IPA performed to compare the importance of and satisfaction with service factors, both importance and satisfaction are high in the 1st quadrant, which involves the economic advantage of using regular freight services, quick arrival at destinations, weight freight handling, and less time constraints on freight receipt/dispatch. This area requires continuous management. Satisfaction is higher than importance in the 2nd quadrant, which involves the adequacy of freight, cost savings over ordinary courier services, notification on freight arrival, and freight tracking information. This area requires intensive investment and management. Satisfaction is lower than importance in the 3rd quadrant, involving the credit card payment system, courier delivery service, distance to freight handling sites, easy access to freight handling sites, and prompt problem solving. This area requires further intensive management. Both importance and satisfaction are low in the 4th quadrant, involving the availability of collection service, storage space at freight handling sites, kindness of collection/delivery staff, kindness of outlet staff, and easy delivery checks. This area is a set of variables should be excluded from priority control targets. Conclusions - Based on the IPA, service factors that need priority controls because of high importance and low satisfaction include the credit card payment system, delivery service, distance to freight handling sites, easy access to freight handling sites, and prompt problem solving. The findings need to be applied to future marketing strategies for regular freight services and for developing competitiveness enhancement programs.

• 한국응급구조학회지
• /
• 제20권3호
• /
• pp.95-105
• /
• 2016

Purpose: The purpose of the study was to examine the career obstacle factors and career identity according to career choice type among paramedic students. Methods: A self-reported questionnaire was completed by 234 paramedic students in C area from August 25 to September 3, 2015. The questionnaire consisted of general characteristics of the subjects, career obstacle factors, career identity, and types of career choice. The data were analyzed by t test, ANOVA, post hoc $Scheff{\acute{e}}$ test, Pearson's correlation analysis, and multiple regression analysis using SPSS v. 20.0. Results: Career obstacle factors and career identity of paramedic students had significant differences on motivation of university choice, major satisfaction, and job preference. A stable type of career choice showed a significantly lower score for career obstacle factors and a higher score for career identity. Career identity had a strongly positive relationship with major satisfaction and had a negative relationship with career obstacle factors. Logistic regression analysis revealed that the main variables affecting career identity were types of career choice, motivation of university choice, major satisfaction, and career obstacle factors. The explanatory power was 58.0%. Conclusion: The development of a career integrity enhancement program can solve the career obstacle factors for paramedic students.