• 열처리공학회지
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• 제18권4호
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• pp.247-255
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• 2005

Although heat treatment is a process of great technological importance in order to obtain desired mechanical properties such as hardness, the process was required a tedious and expensive experimentation to specify the process parameters. Consequently, the availability of reliable and efficient numerical simulation program would enable easy specification of process parameters to achieve desired microstructure and mechanical properties without defects like crack and distortion. In present work, the developed numerical simulation program could predict distributions of microstructure and thermal stress in steels under different cooling conditions. The computer program is based on the finite difference method for temperature analysis and microstructural changes and the finite element method for thermal stress analysis. Multi-phase decomposition model was used for description of diffusional austenite decompositions in low alloy steels during cooling after austenitization. The model predicts the progress of ferrite, pearlite, and bainite transformations simultaneously during quenching and estimates the amount of martensite also by using Koistinen and Marburger equation. To verify the developed program, the calculated results are compared with experimental ones of casting product. Based on these results, newly designed heat treatment process is proposed and it was proved to be effective for industry.

• Industrial Engineering and Management Systems
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• 제3권2호
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• pp.100-115
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• 2004

The network representation and branch and bound algorithm with efficient lower and upper bounding procedures are developed to determine a global optimal production schedule on a machine that minimizes sequence-dependent setup cost and earliness/tardiness penalties. Lower bounds are obtained based on heuristic and Lagrangian relaxation. Priority dispatching rule with local improvement procedure is used to derive an initial upper bound. Two dominance criteria are incorporated in a branch and bound procedure to reduce the search space and enhance computational efficiency. The computational results indicate that the proposed procedure could optimally solve the problem with up to 40 jobs in a reasonable time using a personal computer.

• 열처리공학회지
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• 제12권3호
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• pp.206-214
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• 1999

The effect of cooling rate on carbide precipitation during quenching of austenitic manganese steel was investigated by optical microscopy, image analyzer and numerical analysis. A computer program based on the finite difference method for analyzing heat treatment processes was developed in order to evaluate cooling rates and the possibility of carbide precipitation during quenching. The area ratio of carbide precipitated in the austenite matrix was measured by the image analyzer, and used to determine the critical point of carbide precipitation. Temperature-dependent critical cooling rates at the critical points were calculated using the present simulation program, The calculated results showed a good agreement with the experimental ones.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.851-856
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• 2005

The precision fabrication of aspherical lenses is increasingly required for the latest applications of compact and high resolution video-recording or camera systems. Micro-optical components, including micro-spherical or aspherical lenses and reflecting mirrors, are generally required to be manufactured with high shape accuracy, extremely low surface roughness and no surface damage. To meet the needs of the precision fabrication system, a bed which supports the micro aspherical lens fabrication machines stably and safely is required. In this study, the thickness of the ribs of the bed is optimized using the CAD integrated optimal design system, a virtual DS program.

• 한국멀티미디어학회논문지
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• 제22권6호
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• pp.738-747
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• 2019

Both within the country and internationally, discussions about core technologies that will be prominent in future society have been initiated, and software education for the rapidly changing industrial framework has been essential and implemented in earnest. Also, there is an increasing interest in interactive technology and software education where people and people, people and computers, and computers and objects communicate with each other in today's day-to-day life, connected through the digital world. Therefore, it is necessary to investigate the user's field of interest and the best technical education method for teaching how to operate the production tool for implementing the interactive technology. In this study, we utilize the Processing program which is widely used as interactive technology software training and creativity tool to improve the understanding of the interactive technology related to the 4th industrial revolution. This study aims to determine and propose the best method of using a Processing library that can be applied to each major field.

• 한국산학기술학회논문지
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• 제12권6호
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• pp.2506-2514
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• 2011

본 연구는 기술사업화 교육의 성공적인 결과를 가져오기 위해서는 흡수역량의 단계별 프로세스가 유용하다는 것을 제시하면서 이를 위해 흡수역량과 교육성과와의 관계를 파악하기 위해 기술사업화 교육에 참여한 교육생을 대상으로 분석하였다. 분석 결과, 흡수역량의 단계별 과정인 잠재흡수능력이 실현흡수능력에 긍정적인 영향을 미치고, 실현흡수역량은 교육성과에 영향을 미치는 것으로 나타났다. 이는 흡수역량의 단계별 과정을 통해 기술사업화 교육을 실시할 때 비로소 기술사업화 교육이 성공할 수 있는 가능성이 높아짐을 의미한다. 즉, 기술사업화 교육은 기능별 교육이 아닌 과정중심의 교육이 이루어져야 하며, 실제적, 집중적, 학제적, 반복적이어야 할 것이다,

• 대한산업공학회지
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• 제40권2호
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• pp.172-183
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• 2014

This paper measures and compares the efficiency of national health technology R&D programs focused on translational research program increasing importance using data envelopment analysis (DEA). Three input variables and three output variables are selected for DEA. Inputs are funds, researchers, and project period and outputs are SCI (E) papers, applied and granted patents, and impact factor. This study uses a three-stage approach. In the first stage, output-based DEA model is applied to evaluate the efficiency of decision making unit (DMU). In the second stage, based on efficiency scores of target diseases high-efficiency group and low-efficiency group are classified. And then strategic portfolio matrix of translational research program is composed of four dimensions combining research types. Mann-Whitney U test is then run to compare average efficiency scores among four groups. In the final stage, Tobit regression model is used to estimate factors likely to influence the efficiency. The results are expected to provide policy implications for effectively establishing investment strategy and managing performance of R&D program.

• 한국산학기술학회논문지
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• 제11권3호
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• pp.1071-1078
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• 2010

본 논문은 기술창업교육프로그램의 품질이 교육 참여자의 만족도와 타인에 추천의향에 미치는 영향도를 분석하였다. 이 분석의 목적은 기술창업교육프로그램의 방안으로 실행된 TEC(Technology Entrepreneurship & Commercialization: 미국 노스캐롤라이나주립대 개발 & 한국 기술사업화교육팀 보정) 프로그램의 유효성을 평가하고 이에 대한 개선방안을 도출해 성공창업을 견인하기 위해 국가적 차원에서 실시하고 있는 창업교육의 우수한 대안을 제시하는데 있다. 특히, 본 논문은 세부적 분석을 위해 PZB의 SERVQUAL 모형에 근거하여 TEC 교육 서비스의 품질평가 문항을 구축하고, TEC 교육이수자들에 대한 설문조사를 통해, 이것이 참여자의 만족도에 미치는 영향과, 만족도가 추천의향에 미치는 영향을 실증 분석하였다. 분석결과, 본 논문은 SERVQUAL 항목 중 유형성과 확신성 그리고 교육내용은 참여자의 만족도에 (+) 영향을 주는 것으로 나타났으며 교육참여자의 만족도는 추천의향과 (+) 관계가 존재함을 확인하였다. 이는 TEC 프로그램이 그 동안의 교육실시과정에서 우수한 학습환경의 조성과 신뢰 있는 교육내용에서 상당한 교육 만족도를 확보하고 있음을 입증하고 있다.

• Journal of Information Processing Systems
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• 제17권5호
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• pp.960-971
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• 2021

As the era of the 4th Industrial Revolution enters, the importance of software safety is increasing, but related systematic educational curriculum and trained professional engineers are insufficient. The purpose of this research is to propose the high priority elements for the software safety education program through needs analysis. For this purpose, 74 candidate elements of software safety education program were derived through contents analysis of literature and nominal group technique (NGT) process with five software safety professionals from various industries in South Korea. Targeting potential education participants including industrial workers and students, an on-line survey was conducted to measure the current and required level of each element. Using descriptive statistics, t-test, Borich needs assessment and Locus for focus model, 16 high priority elements were derived for software safety education program. Based on the results, suggestions were made to develop a more effective education program for software safety education.

• 4차산업연구
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• 제2권1호
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• pp.9-17
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• 2022

Purpose -In general, elementary school is the time to take the first social step away from family relationships with parents or siblings. Recently, AI technology has been widely used in everyday life and society. The purpose of this study is to propose a program that can cultivate AI literacy and self-expression for elementary school students according to the trend of the times. Research design, data, and methodology - In this study, prior to developing a self-expression class program for cultivating AI literacy, we looked at the related literature on what AI literacy is. In addition, the digital learning program was analyzed considering that the current AI literacy is based on the cutting edge of digital technology and is located in the same area as digital literacy. Result -This study developed a curriculum for self-expression and AI literacy cultivation. The main feature of this study is that the education program of this study allows 3rd, 4th, and 5th graders of elementary school to express themselves and to express their career problems by combining culture and art with AI programs. Conclusion -Self-expression activity education for cultivating AI literacy should be oriented toward holistic education and should be education as a way to express oneself in order to improve the quality of life of learners