6-도메인 스마트팩토리 성숙도 평가 모델 기반 도입기업 군집분석

정도현,안정현,최상현,Jeong, Doorheon,Ahn, Junghyun,Choi, Sanghyun 한국융합학회 2020 한국융합학회논문지 Vol.11 No.9

스마트팩토리는 가장 빠르게 발전하고 변화하는 4차 산업혁명 분야 중 하나이다. 스마트팩토리에서 도입정도와 성숙도 수준 평가는 중요한 부분에 해당한다. 본 논문에서는 국내 스마트팩토리를 도입한 중소기업들을 대상으로 설문 조사를 진행한 데이터를 바탕으로 스마트팩토리 도입 현황과 새로운 성숙도 평가 모델 기반 군집분석을 진행하였다. 설문에 응한 스마트팩토리 도입 기업의 약 68% 기업들이 기초수준에 해당하였고, 21% 정도만이 중간1 수준이었다. 대다수 중소기업들이 중간1로 진입하지 못한 가장 큰 이유로 자금부족을 꼽았다. 군집분석 결과, 군집별 패턴은 유사하지만 정도의 차이에 따라 '상, 중, 하' 3개로 군집됨을 확인할 수 있었고, 6 도메인 중 프로세스가 상대적으로 성숙도가 가장 높았고, 데이터가 가장 낮은 수준을 보였다. 이를 통해 6개 도메인 기반 새로운 스마트팩토리 성숙도 평가 모델을 활용하여, 보다 구체적이고 정량적인 성숙도 수준 측정 및 분석이 가능함을 보였다. Smart Factory is one of the fastest developing and changing fourth industrial revolution fields. In particular, the degree of introduction and maturity level in the smart factory is an important part. In this paper, a cluster analysis of companies introduced smart factory was performed based on a new maturity assessment model. The 68% of 193 companies surveyed were at the basic level, with only 21% being the middle one. Most SMEs cited lack of funds as the main reason for not entering the middle one. As a result of the cluster analysis, it was found that all clusters had similar patterns but grouped into one of three levels of high, middle, and low depending on maturity level of smart factory operation, and process domain had the highest maturity and data domain was lowest among the 6 domains. Through this, analysis of more specific and quantified maturity levels can be performed using 6-domain smart factory maturity evaluation model.

부 최적화 문제의 근사적인 계산을 통한 신뢰도 최적설계 방범의 효율개선

정도현,이병채,Jeong, Do-Hyeon,Lee, Byeong-Chae 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.10

Alternative computational scheme is presented fur reliability based optimal design using a modified advanced first order second moment (AFOSH) method. Both design variables and design parameters are considered as random variables about their nominal values. Each probability constraint is transformed into a sub -optimization problem and then is resolved with the modified Hasofer- Lind-Rackwitz-Fiessler (HL-RF) method for computational efficiency and convergence. A method of design sensitivity analysis for probability constraint is presented and tested through simple examples. The suggested method is examined by solving several examples and the results are compared with those of other methods.

알루미늄 합금과 그 접합 방법

정도현,정재필 한국마이크로전자및패키징학회 2018 마이크로전자 및 패키징학회지 Vol.25 No.2

Aluminum (Al) and its alloys have been used widely in a variety of industries such as structural, electronic, aerospace, and particularly automotive industries due to their lightweight characteristic, outstanding ductility, formability, high oxidation and corrosion resistance, and high thermal and electrical conductivity. Al have different kinds of alloys according to the various additional elements system and they should be selected properly depending on their effectiveness and suitability for their particular purpose. The major elements for Al alloys are silicon (Si), magnesium (Mg), manganese (Mn), copper (Cu), and zinc (Zn). In order for Al alloys to use for each industry, it is necessary to study of Al to Al joining and/or the Al to dissimilar materials joining to combine the individual parts into one. Many studies on joining technologies about Al to Al and Al to dissimilar materials have been performed such as press joining, bolted joint, welding, soldering, riveting, adhesive bonding, and brazing. This study reviews a variety of Al alloys and their joining method including its principles and properties with recent trends.

Reliability prediction of the fatigue life of a crankshaft

정도현,김홍진,편영식,Alisher Gafurov,최규철,안종모 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4

Crankshaft, the core element of the engine of a vehicle, transforms the translational motion generated by combustion to rotational motion. Its failure will cause serious damage to the engine so its reliability verification must be performed. In this study, the S-N data of the bending fatigue limit of a crankshaft are derived. To evaluate the reliability of the crankshaft, reliability verification and analysis are performed. For the purpose of further evaluation, the bending test of the original crankshaft is carried out, and failure mode analysis is made. The appropriate number of samples, the applied load, and the test time are computed. On the basis of the test results, Weibull analysis for the shape and scale parameters of the crankshaft is estimated. Likewise, the B10 life under 50% of the confidence level and the MTTF are exactly calculated, and the groundwork for improving the reliability of the crankshaft is laid.

3차원 실장을 위한 TSV의 Cu 전해도금 및 로우알파 솔더 범핑

정도현,쿠마르산토쉬,정재필,Jung, Do hyun,Kumar, Santosh,Jung, Jae pil 한국마이크로전자및패키징학회 2015 마이크로전자 및 패키징학회지 Vol.22 No.4

Research and application of three dimensional packaging technology in electronics have been increasing according to the trend of high density, high capacity and light weight in electronics. In this paper, TSV fabrication and research trend in three dimensional packaging are reported. Low alpha solder bumping which can solve the soft error problem in electronics is also introduced. In detail, this paper includes fabrication of TSV, functional layers deposition, Cu filling in TSV by electroplating using PPR (periodic pulse reverse) and 3 step PPR processes, and low alpha solder bumping on TSV by solder ball. TSV and low alpha solder bumping technologies need more studies and improvements, and the drawbacks of three dimensional packaging can be solved gradually through continuous attentions and researches.

지능형 차량 안전시스템 개발 동향

정도현,Jeong, Do-Hyeon 한국전기전자재료학회 2009 전기전자재료 Vol.22 No.9

경량소재융복합기술센터 소개 및 기계적 체결 장비구축 현황

정도현,차준호,김숙환 대한용접·접합학회 2019 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2019 No.5

시점이 다른 복수의 거리 데이터 간의 변환 계수의 추출 ( A Method of Registration of Multiple Range Views )

정도현,이상욱 대한전자공학회 1995 대한전자공학회 학술대회 Vol.1995 No.1

체육교사의 기계체조 수업 운영 부담 및 어려움과 개선방안: 기계체조 수업 경험 중심

정도현 한국체육교육학회 2022 한국체육교육학회지 Vol.26 No.6

Purpose: The purpose of this study is to explore, interpret, and suggest an alternative to improve the burdens and difficulty of the artistic gymnastics class through the physical education instructor’s experience in operating the artistic gymnastics class. Method: In order to achieve the purpose of the study, a phenomenological study was conducted, and 7 secondary physical education teachers were selected as the study participants. The data were collected two in-depth interviews, and analysis was conducted emphasizing commonly found meaningful statements, sentences, and quotations. Results: Physical education instructor felt the burden and difficulty in operating the artistic gymnastics class due to safety accidents of student (spinal injury), teacher professionalism (assistance, demonstration, teaching and learning methods, and qualitative assessment), and students' dislikes. Improvement plans for safety accidents include correct performance of action and class operation for basic physical strength improvement, enhancement of teacher’s ability to utilize facilities, tools, and equipment, and support for facility development and supply of educational institutions. Methods for improving the professionalism of teachers include reforming the curriculum of higher education institutions, expanding training opportunity, developing and disseminating data of education, and using process evaluation and peer review. Improvement plans for students' dislikes include operating classes to increase the positive perception of artistic gymnastics, development and utilization of game-type teaching and learning methods to increase interest and motivation, and modifying and using the K-Gymstar program. Conclusion: As a 'curriculum developers', teachers need continuous efforts to develop, transform, and utilize appropriate classes in consideration of various environmental characteristics that may affect classes, such as teachers and students, in order to improve the burden and difficulty of operating artistic gymnastics classes. In addition, various educational support such as dissemination of education materials and expansion of opportunity for training are needed in the country or educational institutions so that these efforts of teachers can be realized in actual spot of education. 목적: 본 연구는 체육교사의 기계체조 수업 운영 경험을 통해 기계체조 수업의 부담과 어려움을 탐색하고 해석하며, 개선하기 위한 방안을 제시하는 데 목적이 있다. 방법: 연구의 목적을 달성하기 위해 현상학적 연구를 실시하였으며, 7명의 중등 체육교사를 연구 참여자로선정하였다. 자료는 2차에 걸친 심층 면담을 통해 수집하였으며, 공통적으로 발견된 의미 있는 진술이나 문장, 인용문을 강조해 분석을 실시하였다. 결과: 체육교사는 학생의 안전사고(척추의 상해), 교사의 전문성(보조, 시범, 교수·학습 방법, 질적 평가), 학생의 비선호로 인해 기계체조 수업 운영에 부담과 어려움을 느끼고 있었다. 안전사고에 대한 개선방안으로는 올바른 동작 수행과 기초체력 향상의 수업 운영, 교육기관의 시설 개발 및 보급, 교사의 시설 및 용·기구활용 능력 신장 등이 있다. 교사의 전문성에 대한 개선방안으로는 고등교육기관의 교육과정 개선, 연수 기회확대, 교육 자료의 개발 및 보급, 과정 중심 평가와 동료평가의 활용 등이 있다. 학생의 비선호에 대한 개선방안으로는 기계체조의 긍정적 인식을 높이기 위한 수업 운영, 흥미와 동기를 높이기 위한 게임 형태의 교수·학습 방법 개발 및 활용, K짐스타 프로그램 변형 및 활용 등이 있다. 결론: 교사는 ‘교육과정 개발자’로서 기계체조 수업 운영의 부담과 어려움을 개선하기 위해 교사, 학생 등 수업에 영향을 미칠 수 있는 여러 환경적 특성을 고려해 적합한 수업을 개발·변형하고 활용하는 끊임없는 노력이 필요하다. 또한 교사의 이러한 노력이 실제 교육현장에서 구현될 수 있도록 국가나 교육기관에서는 교육자료 보급 및 연수 기회의 확대 등 다양한 교육적 지원이 필요하다.

도금시간 및 전류밀도에 따른 TSV내 Cu 충전 및 로우알파 솔더 범핑

정도현,Ashutosh Sharma,추용철,정재필 대한용접·접합학회 2015 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2015 No.11