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차원축소와 클러스터링을 동시에 적용한 데이터 분석 방법에 대한 연구
신병철(Byung-Cheol Shin),최승빈(Seung-Bin Choi),김보성(Bo-Sung Kim),배성민(Seong-Min-Bae),송성민(Seong-Min Song),장혁수(Hyeok-Su Jang),한동근(Dong-Geun Han),박세진(Se-Jin Park) ICT플랫폼학회 2023 ICT플랫폼학회 하계학술발표대회논문집 Vol.10 No.2
4차 산업혁명 시대로 넘어오며 데이터 분석이 중요해졌고 그 중 클러스터링과 같은 기술이 강조되고 있다. 본 논문에서 데이터 분석의 핵심요소인 클러스터링과 차원 분석 기법인 차원 축소에 대해 설명하고 클러스터링 차원에서 차원 축소를 적용했을 때 최대 약 2.95배 높은 실루엣 계수를 확인할 수 있다. 이를 통해 본 연구는 클러스터링과 차원 축소를 동시에 적용하였을 때 높은 성능 향상이 발생하고 저차원보다는 고차원에서 차원 축소가 더욱 효율적이라는 사실을 알 수 있다.
종이 헬리콥터 실험을 통한 개발단계 성능변동의 이해와 개선
신병철 ( Byung Cheol Shin ),김시웅 ( Si Ung Kim ),정순민 ( Sun Min Jeong ),변재현 ( Jai Hyun Byun ),남용석 ( Yong Seog Nam ) 한국품질경영학회 2015 품질경영학회지 Vol.43 No.4
Purpose: In developing new products, reducing performance variation is important for competitiveness factors such as quality, cost, and delivery. This paper aims at evaluating three performance variations; measurement,performance evaluation, and manufacturing variations, and then improving product and process design, focused on paper helicopter making case study.Methods: For measurement system analysis, gage R&R (repeatability and reproducibility), linearity, stability are evaluated. Since gage R&R are not satisfactory, the measurement system is improved by adopting voice memos application of iPhone and providing standard measurement procedure. To evaluate performance variation,product deterioration and environment factor (wind speed) is considered. Since the existing design is sensitive to these noise factors, a new product design is developed, which is proven to be robust to the noise factors. Finally, manufacturing variations are evaluated with five factors which can cause variation in flight time. To reduce the impact of three significant factors, three improvement methods are applied.Results: Three performance variations are evaluated and robust paper helicopter design is presented.Conclusion: To reduce measurement and process variations, improved measurement method and paper helicopter making procedure are proposed. A new product design is also presented which is robust to deterioration and environmental variation. This paper is expected to benefit students and practitioners who want to have hands-on knowledge on new product quality improvement.
신병철 ( Byung-cheol Shin ),변재현 ( Jai-hyun Byun ),윤태홍 ( Tae Hong Yun ) 한국품질경영학회 2021 품질경영학회지 Vol.49 No.1
Purpose: A noncentral composite design method is to be developed to explore farther region for the first factorial design. A general guideline for sequential experimentation is provided. Methods: (1) A non-overlapping noncentral composite design (NNCD) is developed, in which the second factorial design shares one design point that indicates the best response value in the first factorial design. (2) Four composite designs are compared in terms of the four design evaluation criteria, which are D-, A, G, and I-optimality. (3) A follow-up design strategy is suggested based on the interaction effect, direction of improvement, number of factors. Results: (1) NNCD and model building method are presented, which is useful for exploring farther region from first factorial design block. (2) The performances of the four composite designs are compared. (3) A follow-up design strategy is suggested. Conclusion: (1) NNCD will be useful to explore farther region for the first factorial design. (2) A follow-up design strategy can be beneficial to the experimental practitioners for product and process design and improvement.
일반품질연구 : 양산단계 군수품에 대한 정부품질보증활동 실효성 향상 방안
신병철 ( Byung Cheol Shin ),황우열 ( Woo Yull Hwang ),안남수 ( Nam Su Ahn ),김덕환 ( Deok Hwan Kim ),이계림 ( Gye Lim Lee ),장봉기 ( Bong Ki Jang ),변재현 ( Jai Hyun Byun ) 한국품질경영학회 2016 품질경영학회지 Vol.44 No.1
Purpose: Government quality assurance (QA) activities in Korea, which is carried out by the Defense Agency for Technology and Quality, is not effective due to 1) the obscureness of the QA implementation method, 2) the gap between QA activities of provisions and those conducted in the fields, and 3) the variation in subjective judgement among the QA personnel. The purpose of this paper is to propose some suggestions to enhance the effectiveness of government QA activities for military supplies in the production stage. Methods: QA activities for military supplies are investigated and problematic aspects are deduced for the production stage. To secure the effectiveness of the QA activities, Defense Contract Management Agency of the United Sates is benchmarked and five improvement methods are presented. Results: Five improvement aspects are 1) reflecting special terms and conditions of government mandatory inspection in contract, 2) classifying QA personnel, 3) making use of data collection and analysis template compulsory, 4) providing checklist for process review, and 5) establishing guidelines for sampling plans for product examination. Conclusion: Suggestions of this paper can lead to consistency and balance in government QA activities, reducing military suppliers` complaints and enhancing the effectiveness of QA effort, and ultimately contributing to the quality improvement of military supplies.
한약투여 및 식이, 운동지도를 통한 소아성장치료의 임상적 관찰
공재철 ( Jae Cheol Kong ),이정한 ( Jeong Han Lee ),고연석 ( Youn Seok Ko ),이유진 ( Eu Gene Lee ),나철 ( Cheol Na ),박단서 ( Darn Seo Park ),송용선 ( Yung Sun Song ),신병철 ( Byung Cheul Shin ) 한방재활의학과학회 2008 한방재활의학과학회지 Vol.18 No.3
Objectives : The aim of this study was to observe and analysis the effectiveness of clinical treatments on the growth of children treated with Korean herbal medicine (KHM). Methods : Forty-two children of growth retardation were evaluated from January 2007 to May 2008. All children were administered KHM with diet and exercise guidance. Height percentile and predictive height were calculated following the General Growth Statistics Result (2007), and compared those of pre-treatment with post-treatment. Results : Thirty-one of them were improved (73.8%) and eleven were not (26.2%). The mean growth rate was 7.2cm/yr for male and 6.8cm/yr for female. The mean growth percentile of male showed 7.6% improvement (p=0.003), female 4.4% respectively (p=0.036). The mean predictive height of male showed 2.2cm improvement (p=0.005), female 1.0cm respectively (p=0.007). Change of growth percentile and predictive height were significantly higher on period of prepuberty, and in small children below 50% of height percentile. About inter-relations between growth improvement and compliance of diet, exercise or medication, meaningful statistics were shown in diet control than the others (p=0.077). Diet compliance was in close connection with exercise, but others were not shown close correlations. Conclusions : These results showed that KHM showed promising results on children growth and healthy diet would be an important factor for growth of children. And it was recommended that KHM should be applied on period of prepuberty and smaller than average height.