• Journal of Astronomy and Space Sciences
• /
• 제6권2호
• /
• pp.127-135
• /
• 1989

연세대학교 천문대의 60cm와 40cm 반사망원경을 이용하여 1982년 4월 부터 1985년 5월까지 Epsilon Aurigae를 UBV 관전측광하여 총 1065 관측점을 얻었다. 우리의 광도곡선에 다른 천문대들의 관측자료를 합하여 제1극심의 광도곡선을 완성하였다. 이 광도곡선에서 2차적인 광도변화, 폭발현상, 식중심의 밝아짐 등에 관하여 자세히 조사하고, 제1그심의 각 접촉시각들과 중심식 시각을 결졍하여 다른 연국자들이 정한 값들과 비교하였다. 과거의 식들에서 구한 값들과 비교한 결과, 식이 일어나는 전체기간은 계속 감소하는 반면 완전식의 기간은 계속 증가하였다. 현재 가장 널리 통용되는 디스크 모델에 위의 여러 현상들을 적용하여 보았으나 명확히 설명되지 않았다. 그래서 새로운 모델인 혜성 모델을 만들어 광도곡선에 나타난 현상들을 해석하여 보았다.

• 기술경영경제학회:학술대회논문집
• /
• 기술경영경제학회 2006년도 제28회 동계학술발표회 논문집
• /
• pp.131-149
• /
• 2006

The increasing number of mobile phone users has caused the increasing number of mobile internet subscribers since the 2000s. However, there are little studies on commercial transactions through mobile internet by contraries of abundant studies on the traditional offline and online commerce. This paper aims to find out some factors affecting customer satisfaction in the mobile commerce. For this purpose, influential factors were drawn out by comparing mobile commerce with e-commerce and a more systematic framework was developed. 6 factors were proposed such as mobile internet experience, perceived content Quality, perceived ease of use, perceived price level, perceived system Quality and perceived security level. Initially, they have effects on the customer satisfaction, and then, they have relationships with customer complaint and customer loyalty. In this paper, a Questionnaire survey was conducted. And a general structural equation model was applied to empirically test the proposed research model which is based on the relationships among the 6 factors and customer satisfaction, customer complaint and customer loyalty. This study will be useful to firms providing services of mobile commerce, because it can find out some influential and significant factors of the mobile commerce.

• 한국콘텐츠학회논문지
• /
• 제15권10호
• /
• pp.18-25
• /
• 2015

한류열풍이후 연기예술 분야가 산업화하면서 콘텐츠 투자의 안정화를 위한 배우경영의 과학화에 대한 요구가 높아졌다. 이에 따라 본 연구는 학제간 연구를 통해 융합적인 관점에서 새로운 배우 평가모델을 마련하기 위해 시작되었다. 문헌고찰을 통해 배우평가 요소들을 엄선해 분류하고 델파이기법을 적용하여 전문가들이 컨센서스를 이룬 결과, 배우의 평가요소는 자질적 요소인 연기 및 소통 능력, 신체 조건과 이미지, 연기와 작품에 대한 적극성과 열정, 작품 및 제작환경에 대한 이해도, 배우철학과 자기관리의 안정성, 성과적 요소인 시청자와 관객 동원 능력, 스타덤, 팬덤, 작품 경력, 네트워크 등 10가지로 도출되었다.

• 품질경영학회지
• /
• 제39권4호
• /
• pp.507-515
• /
• 2011

MIL-HDBK-217 has played a pivotal role in reliability prediction of electronic equipments for more than 30 years. Recently, RIAC developed a new methodology $217Plus^{TM}$which officially replaces MIL-HDBK-217. Sensitivity analysis of the 217Plus component models to various parameters has been performed and meaningful observations have been drawn in this study. We first briefly reviewed the $217Plus^{TM}$ methodolog and compared it with the conventional model, MIL-HDBK-217. We then performed sensitivity analysis $217Plus^{TM}$ component models to various parameters. Based on the six parameters and an orthogonal array selected, we have performed indepth analyses concerning parameter effects on the model. Our result indicates that, among various parameters, operating temperature and temperature rise during operation have the most significant impacts on the life of a component, and thus a design robust to high temperature is the most importantly required. Next, year of manufacture, duty cycle, and voltage stress are weaker but may be significant when they are in heavy load conditions. Although our study is restricted to a specific type of diodes, the results are still valid to other cases. The results in this study not only figure out the behavior of the predicted failure rate as a function of parameters but provide meaningful guidelines for practical applications.

• 한국멀티미디어학회논문지
• /
• 제18권12호
• /
• pp.1562-1568
• /
• 2015

The 3D contents are getting more attentions in various areas, such as in movies, advertising, games and exhibition contents. There are many authoring tools for making 3D Models and contents. However, those authoring tools take considerable amount of time to learn and to make 3D contents. In this paper, we propose the 3D model conversion algorithm to make 3D models from 2D pictures drawn on the touch screens or papers. The vertex animation method also proposed for the interactive 3D aquarium. The proposed vertex animation algorithm was tested for virtual 3D water creatures and compared with human-made animation. An Interactive 3D aquarium was implemented by using those proposed algorithms. Thus the simplicity and effectiveness of the algorithms can be applied to diverse industries.

• 소성∙가공
• /
• 제22권8호
• /
• pp.470-476
• /
• 2013

The aim of the current study was to predict shape recovery behavior of Ni-Ti shape memory alloy (SMA) wire after loading-unloading and after wire drawing. The superelasticity of SMA was analyzed by a hyper-elastic model for the Mullins effect using ABAQUS. Firstly, tensile tests and loading-unloading tests of the Ni-Ti SMA wire with a diameter 1.0 mm were performed using an MTS servo-hydraulic tester. The parameters for the Mullins effect were computed by ABAQUS based on curve-fitting of the loading-unloading test data. The proposed FE-model predicted the shape recovery of Ni-Ti SMA after wire drawing. Finally, the effectiveness of the model was verified by drawing experiments. The wire drawing experiments using the Ni-Ti SMA were conducted on a drawing machine(1ton, 50mm/s). In order to evaluate the shape recovery of Ni-Ti SMA, the drawn wires are annealed for 30min at $450^{\circ}C$.

• 산업경영시스템학회지
• /
• 제35권4호
• /
• pp.41-47
• /
• 2012

To adapt to a rapidly changing business environment, introduction of new management techniques and innovative activities are crucial. In the case of small and medium companies, the compensation for scarce management resources and sustainable development can be obtained from advantage of management consulting. In this study, we propose the enterprise process evaluation model for small and medium business consulting, which can deploy the process improvement activities with considering the process maturity level within an organization. The process evaluation area of proposed Small and Medium Business, Staged Maturity Model (SMB-SMM) consists of four following parts: supply management, demand management, business management, and research and development (R&D) management. For each area, we set goals and also define the practices to achieve their goals respectively. By applying the SMB-SMM model to the small and medium sized companies, the process maturity level can be defined. And then to overcome the gap between the goals and evaluation results, the customized management consulting activities can be drawn from the predefined consulting approaches from the SMB-SMM.

• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2009년도 추계학술대회
• /
• pp.187-201
• /
• 2009

Semiconductor industry is based on equipment industry and timing industry. In particular, semiconductor process is very complex and as semiconductor-chip width tails and is becoming equipment gradually more as a high technology. Equipment operation is primarily engaged in semiconductor manufacturing (engineers and operator) of being conducted by, equipment errors have also been raised. Equipment operational data related to the error of korea occupational safety and health agency were based on data and production engineers involved in the operator's questionnaire was drawn through the error factor. Equipment operating in the error factor of 9 big item and 36 detail item detailed argument based on the errors down, and 9 big item the equipment during operation of the correlation error factor was conducted. Each of the significance level was correlated with the tabulation and analysis. Using the maximum correlation coefficient, the correlation between the error factors to derive the relationship between factors were analyzed. Facility operating with the analysis of error factors (big and detail item) derive a relationship between the model saw. The end of the operation of the facility in operation on the part of the two factors appeared as prevention. Safety aspects and ergonomics aspects of the approach should be guided to the conclusion.

• 보건교육건강증진학회지
• /
• 제20권2호
• /
• pp.179-196
• /
• 2003

This study was aimed at examining the self-reported health-promoting life- style (HPL) and related factors among teachers assumed to be role models for students. The subjects were 300 teachers who were conviently drawn from nine elementary schools and three high schools. The conceptual framework for this study was based on the Pender's revised Health Promotion Model(1996). Data was collected by a mailed survey (response rate, 62.5％) with structured questionnaire. The score of health-promoting life-style was 2.8(full mark： 5.0), harmonized relationship was the highest(3.2), and professional helath management was the lowest(2.0). The related factors to health-promoting life-styles were age, marital stauts, career, perceived health status, self esteem, intermal locus of control, perceived benefit, perceived barrier, self efficacy, and social support in univariate analysis. In the final regression model, predictors of HPL were social support, self esteem, perceived benefit. self efficacy, and perceived health status after control the effects of demographic characteristics (p＜.0001, R2＝0.494). The results generally supported the Pender Model. It is recommended to develop the health promotion program for teachers based on these results, and to evaluate the effect of that program for teacher.

• International Journal of Aeronautical and Space Sciences
• /
• 제18권3호
• /
• pp.436-449
• /
• 2017

In this paper, the damage and failure behavior of triaxially braided textile composites was studied using progressive failure analysis. The analysis was performed at both micro and meso-scales through iterative cycles. Stress based failure criteria were used to define the failure states at both micro- and meso-scale models. The stress-strain curve under uniaxial tensile loading was drawn based on the load-displacement curve from the progressive failure analysis and compared to those by test and computational results from reference for verification. Then, the detailed failure initiation and propagation was studied using the verified model for both tensile and compression loading cases. The failure modes of each part of the model were assessed at different stages of failure. Effect of ply stacking and number of unit cells considered were then investigated using the resulting stress-strain curves and damage patterns. Finally, the effect of matrix plasticity was examined for the compressive failure behavior of the same model using elastic, elastic - perfectly plastic and multi-linear elastic-plastic matrix properties.