• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2005년도 춘계 학술발표대회 논문집
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• pp.196-197
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• 2005

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2010년도 추계학술대회 논문집
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• pp.257-258
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• 2010

• 산업공학
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• 제9권1호
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• pp.13-24
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• 1996

Quality of injection molded parts is dependent on both mold design and processing conditions. From the mold design point of view, an optimal shrinkage should be used to compensate the shrinkage of molded parts. From the processing point of view, it is important to analyze the priority of processing conditions because a number processing conditions affect the quality of molded parts. Processing analysis employing the design of experiment was performed, and the shrinkage of molded part was considered as a characteristic parameter to improve the quality. As the result of the analysis of variance on SN ratio of a characteristic value, injection speed and bolding pressure were selected as two effective process parameters. Regression analysis on shrinkage and processing conditions was carried out, and an optimal processing condition was obtained by the response surface analysis. Shrinkage at the optimal condition could be used to reduce the number of try-cut at the step of mold making. The ranges of indirect control parameter, such as maximum cavity pressure or weight, measured at the optimal processing condition were used for monitoring the quality of molded parts in process.

• 산업진흥연구
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• 제8권4호
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• pp.69-79
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• 2023

본 연구는 직업스트레스가 직업적 가치를 경유하여 행복에 미치는 영향을 그릿이 조절 매개하는지를 검증하여 중국 제품디자이너의 행복 향상을 위한 방안을 제안하고자 하였다. 연구 대상으로 중국 남부 광둥성에 살고 있는 의도적으로 표집한 335명의 중국 제품 디자이너를 선정하였다. 자료 분석은 SPSS PC+ Win. Ver. 26.0과 PROCESS Macro ver. 4.2를 활용하였다. 적용한 통계기법은 빈도분석, 신뢰도분석, 상관분석, 조절된 매개효과분석이었다. 연구결과는 다음과 같다. 첫째, 직무 스트레스는 직업가치 및 그릿과 부적 상관관계를 보였으나 행복과는 유의미한 상관관계를 보이지 않았다. 직무 스트레스를 제외한 다른 변수들 간에는 정적인 유의미한 상관관계를 보였다. 둘째, 그릿이 M-SD, M, M+SD일 M+SD일때 조건부 간접효과가 유의하게 나타났다. 따라서 그릿의 조절된 매개역할이 검증되었다. 그러나 직업적 가치가 높아질수록 그릿은 행복을 높이는 역할을 하였으나, 직무스트레스->직업적 가치->행복의 경로에서는 그릿이 직업적 스트레스를 통해 행복에 미치는 부정적인 영향을 완충시키지 못했다. 직업적 가치와 그릿을 활용한 제품 디자이너들의 행복 증진을 위한 제언을 하였다.

• 소성∙가공
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• 제19권8호
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• pp.486-493
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• 2010

A shape error of the sheet metal product made by a flexible stretch forming process is occurred by a various forming parameters. A die used in the flexible stretch forming is composed of a punch array to obtain the various objective surfaces using only one die. But gaps between the punches induce the shape error and the defect such as a scratch. Forming parameters of the punch size and the elastic pad to prevent the surface defect must be considered in the flexible die design process. In this study, tendency analysis of shape error according to the forming parameters in the flexible stretch process is conducted using a finite element method. Three forming parameters, which are the punch size, the objective curvature radius and the elastic pad thickness, are considered. Finite element modeling using the punch height calculation algorithm and the evaluation method of the shape error, which is a representative value for the formability of formed surface, are proposed. Consequently, the shape error is in proportion to the punch size and is out of proportion to the objective curvature radius and the elastic pad thickness.

• 한국IT서비스학회지
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• 제5권2호
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• pp.93-105
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• 2006

More emphasis has recently been put on the strategic application of IT, the linkage and integration between information system, and business process for value increase of a company's business. Thus, it is high time to redefine the concept of IT governance in order to effectively manage various IT services and assets. However, less attention has been paid to the practical study of domestic firms, compared to in the academic and industrial level. In this study, the current situation of IT governance setup and various factors for future development will be examined by a case study to explore activities, types, and determinants of decision making process that companies are currently conducting regarding IT governance. For the purpose of comparative analysis, two large enterprises were chosen with similar size of sales and high investment rate for IT within the same industry, and in-depth analysis was conducted based on the interviews of the concerned parties and in-house materials, from the perspective of structure, process, and relational mechanism. By the case study on IT governance of company 'A' and 'B', decision making mechanism and factors will be analyzed, which will indicate detailed characteristics of each decision-making field and its components for general application. By doing so, it is expected to be used as reference in building IT governance that fits the environment of a firm in the future.

• 한국안전학회지
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• 제31권4호
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• pp.35-41
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• 2016

In order to guarantee the process safety and prevent accidents, the deviations from normal operating conditions should be monitored and their root causes have to be identified as soon as possible. The statistical theories-based method among various fault diagnosis methods has been gaining popularity, due to simplicity and quickness. However, according to fault magnitudes, the scalar value generated by statistical methods can be changed and this point can lead to produce wrong information. To solve this difficulty, this work employs PCA (Principal Component Analysis) based method with qualitative information. In the case study of our previous study, the number of assumed faults is much smaller than that of process variables. In the case study of this study, the number of predefined faults is 19, while that of process variables is 6. It means that a fault diagnosis becomes more difficult and it is really hard to isolate a single fault with a small number of variables. The PCA model is constructed under normal operation data in order to get a loading vector and the data set of assumed faulty conditions is applied with PCA model. The significant changes on PC (Principal Components) axes are monitored with CUSUM (Cumulative Sum Control Chart) and recorded to make the information, which can be used to identify the types of fault.

• 정보보호학회논문지
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• 제31권1호
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• pp.1-9
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• 2021

본 논문은 RSA 복호화 과정에서 발생한 전력 신호로부터 암호연산을 예측하는 과정을 주파수 분석과 K-means 알고리즘을 이용하여 자동화하는 것을 제안한다. RSA 복호화 과정은 제곱 연산과 곱셈 연산으로 나뉘며, 시간에 따른 연산의 종류를 예측하게 되면, RSA 암호의 키(key)값을 알 수 있게 된다. 본 논문은 복호화 과정에서 발생한 전력 파형을 2차원 주파수 신호로 변환한 후, K-means algorithm을 이용하여 연산의 종류에 따라 주파수 벡터를 분류하였다. 이후, 이러한 분류된 주파수 벡터를 이용하여 연산의 종류를 예측한다.

• 한국전산구조공학회논문집
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• 제28권1호
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• pp.63-69
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• 2015

본 연구에서는 페이즈 필드법을 기반으로 하는 위상 최적설계 방법을 통하여 적외선 스텔스 효과를 위한 적외선 반사층의 설계를 진행하였다. 이를 위하여 수직으로 입사하는 적외선 파를 반사층에서 반사되어 원하는 방향으로 전파되도록 모델링을 하였다. 전파 방향에 측정 영역을 설정하여 해당 영역에서의 목적함수 값을 최대화하도록 설계가 진행되었으며, 이때 목적함수는 전자기파의 에너지 흐름을 나타내는 포인팅 벡터(Poynting vector)로 설정하였다. 페이즈 필드법 기반의 방법에서의 여러 파라미터 값들을 변경해 가며 설계 결과를 도출하였고, 목적함수 값을 최대화하는 모델을 최적 모델로 선정하였다. 선정된 최적 모델에서 gray scale을 cut-off 방법으로 제거한 경우 더 좋은 결과를 얻을 수 있었다. 또한 중적외선 영역에서의 효과를 고려하기 위하여 입사되는 파장을 바꿔가며 얻은 해석결과를 검토하였다. 본 연구의 유한요소해석 및 최적화 과정은 상용 프로그램인 COMSOL과 Matlab을 연동하여 수행하였다.

• 대한예방한의학회지
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• 제6권2호
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• pp.48-63
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• 2002

The study aims to investigate the process of professional socialization of oriental medical students, to analyze influencing factors on it, and to compare the results with those of western medical students. Professional socialization, in the context of this study, means the process through which a layperson becomes a profession equipped with professional identity and values. A survey using specially designed questionnaire was carried out in 1999. The data were collected from 11 oriental medical colleges for 2,656 students. A total of 2,597 cases was finally included in the statistical analysis. Analysis of factors related to professional value found that oriental medical students thought highly of human-oriented factors, followed by science and status, and this trend remained unchanged as they moved on to qualification. Among professionalism related items, those involved in professional regulation and dominance factors showed high scores, while showing low scores on items related to bio-ethics and autonomy factors. Unlike items of professional value, those of professionalism showed a notable difference in attitude statistically by schooling level. The average scores of factors for professionalism increased with increasing schooling years. This trend proved that oriental medical students acquired professional norms and attitudes through their educational period. Multiple regression analysis with the factors related to professional value and professionalism as dependent variables found that independent variables had some impact on science, status, and clinical autonomy, but no impact on human, policy autonomy, and professional regulation factors. In conclusion, with increasing schooling years, professional norms and attitudes of oriental medical students were also strengthened. And, in spite of the differences in general propensity, they have a base consciousness in common with western medical students. The difference of mind-set and attitudes related to professionalism in the two groups, however, considering the necessity of future cooperative relations, indicated that a common curriculum between both schools is needed, and the education of social medicine should be strengthened in oriental medical colleges.