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온도 유지시간 제어를 적용한 하이브리드 분말 압출 공정을 통한 요구 특성의 스퍼기어 제조
이경훈(Kyung Hun Lee),황대원(Dae Won Hwang),김병민(Byung Min Kim) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.8
본 연구는 압출 시 성형온도를 유지하여 Zn-22Al 합금분말의 성형성을 향상시키는 하이브리드 분말 압출 공정의 개발 및 온도 유지시간이 압출된 스퍼기어의 기계적 특성에 미치는 영향을 조사하기 위해 수행되었다. 피치원 지름 1.8mm 의 소형 스퍼기어는 압출온도 290, 300, 310℃에서 성형되었다. 볼밀시간 32h 의 Zn-22Al 합금분말을 압출온도 310℃에서 압출 시 표면 결함이 없는 소형 기어가 제조되었다. 경도분포는 기어 중심부와 치형부에서 불균일하였고 소결공정 후 내부 변형에너지의 차이로 인해 내부균열이 발생하였다. 위와 같은 문제를 해결하기 위해 온도 유지시간 제어를 이용한 하이브리드 압출 연구를 수행하였다. 압출된 스퍼기어의 평가는 압출하중, 비커스 경도 및 치수정밀도 측정을 통해 이루어졌다. 온도 유지시간 15min 에서 압출된 스퍼기어의 기계적 성질이 가장 우수하였다. In this study, a hybrid powder-extrusion process involving the control of temperature dwelling time for improving the formability of Zn-22Al powder was developed and the effect of dwelling time on the mechanical properties of a spur gear with a pitch circle having a diameter of 1.8 mm was investigated. General extrusion experiments were carried out at different temperatures such as 290, 300, and 310°C. Spur gears with good qualities and without any surface defects were obtained in the case of extrusion temperature of 310°C and ball-milling duration of 32 h. The Vickers hardness distribution was non-uniform, and after the sintering process, an internal crack was generated because of the different deformation energy between gear central part and teeth. To overcome the abovementioned problems, research on controlling the dwelling time of the extrusion temperature in the powder-extrusion process was carried out. Good-quality spur gears were obtained when the dwelling time was 15 min.
PV, ESS를 활용한 SEP 2.0 기반의 HEMS 개발
김병민 ( Byung Min Kim ),이상학 ( Sang Hak Lee ),조성호 ( Sung Ho Cho ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.2
최근 에너지 시장의 흐름은 공급위주에서 효율위주로 이동함에 따라 가정 내에서 스마트 그리드와 연동하고 태양광 및 에너지저장시스템을 활용한 에너지 관리 시스템 기술에 대한 연구와 개발이 활발히 진행되고 있다. 하지만 시중에서 판매되는 제품은 인터페이스를 갖추고 있지 않거나 제조사별 독자 프로토콜 사용으로 인한 기존 홈 네트워크와 호환성 문제를 가지고 있다. 본 논문에서는 호환성 향상을 위한 SEP2.0 기반의 홈 에너지 관리 시스템 개발과 에너지관리 스케줄링에 대해 기술하고자 한다.
김병민(Kim, Byung-Min),김현기(Kim, Hyun-Gi),권순열(Kwon, Soon-Yeol),유능수(Yoo, Neung-Soo),백인수(Paek, In-Su) 강원대학교 산업기술연구소 2015 産業技術硏究 Vol.35 No.1
Two extreme wind speed prediction models, the EWM(Extreme wind speed model) in IEC61400-1 and the Gumbel method were compared in this study. The two models were used to predict extreme wind speeds of six different sites in Korea and the results were compared with long term wind data. The NCAR reanalysis data were used for inputs to two models. Various periods of input wind data were tried from 1 year to 50 years and the results were compared with the 50 year maximum wind speed of NCAR wind data. It was found that the EWM model underpredicted the extreme wind speed more than 5 % for two sites. Predictions from Gumbel method overpredicted the extreme wind speed or underpredicted it less than 5 % for all cases when the period of the input data is longer than 10 years. The period of the input wind data less than 3 years resulted in large prediction errors for Gumbel method. Predictions from the EWM model were not, however, much affected by the period of the input wind data.
스키장 선택속성과 이용만족도 및 재방문의도의 구조적 관계: 시즌권 이용의 조절효과
김병민 ( Kim Byung-min ),강유원 ( Kang Yu-won ) 한국체육학회 2020 한국체육학회지 Vol.59 No.2
본 연구는 스키장 이용자의 선택속성이 이용만족도 및 재방문의도에 미치는 영향을 파악하고 이용권 형태를 조절변수로 설정하여 시즌권 이용의 조절변수 역할을 규명하는데 그 목적이 있다. 본 연구의 자료처리는 SPSS 24.0과 AMOS 18.0을 이용하여 빈도분석, 신뢰도분석, 확인적요인분석, 상관관계분석, 구조방정식 모형 검증, 동일성 검증, 다중집단분석을 실시하였고, 다음과 같은 결과가 나타났다. 첫째, 스키장의 프로모션 선택속성은 이용만족도에 유의한 영향을 미치는 것으로 나타났다. 둘째, 주시설, 교통 선택속성은 재방문의도에 유의한 영향을 미치는 것으로 나타났다. 셋째, 이용만족도는 재방문의도에 유의한 영향을 미치는 것으로 나타났다. 넷째, 시즌권 이용은 교통, 서비스 요인이 이용만족도에 미치는 영향과 주시설, 교통 요인이 재방문의도에 미치는 영향에 있어 조절효과가 있는 것으로 나타났다. 이러한 결과에 따라 스키장 이용자에 대한 지속적인 연구와 소비성향과 특성에 따른 차별적인 마케팅 전략이 필요하다. This study has the purpose to identify the influence regarding using satisfaction to selection attribute, and to investigate the moderating role of using season ticket according to set up moderating role with the type of ticket. Data processing of this study was accomplished frequency analysis, reliability analysis, confirmatory factor analysis, correlation analysis, structural equation model analysis, measurement group analysis and multiple group analysis utilizing SPSS 24.0 & AMOS 18.0 , and the following result has been appeared. First, the promotion selection attribute had an effect on using satisfaction. Second, important facility and traffic factor had an effect on revisitation. Third, using satisfaction had an effect on revisit intention. Forth, using season ticket had a moderating effect on traffic and service factors attributes on satisfaction and the effect of facilities and traffic factors attributes on revisit intention. According to this results, continuous research about visitors of ski resort and discriminative marketing strategy along with consumption disposition and character.
입시 체육학원의 선택속성, 교육서비스 품질, 추천 의도의 관계 : 성별의 조절효과
김병민(Kim, Byung-Min) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.3
The purpose of this study was to investigate the relationship between the selection attributes of physical education academies, educational service quality, and recommendation intention of physical education college candidates, and to identify the role of gender as a modulating variable in this relationship. To achieve this purpose, frequency analysis, reliability analysis, correlation analysis, structural equation model verification, and moderating effect analysis were performed using SPSS and AMOS programs, and the following results were found. First, among the selection attributes, leader, external environment, accessibility, counseling, and cost were found to have a significant influence on all sub-factors of education service quality. Second, it was found that among the education service quality, instructor・staff quality and operation quality had a significant effect on recommendation intention. Third, it was found that gender has a moderating effect on the influence of internal environment, external environment, accessibility, cost, and relationship factors on the quality of education service. In addition, there was a moderating effect in the relationship between instructor・staff quality and recommendation intention. Based on these results, it was necessary to conduct continuous research on physical education college candidates and marketing strategies according to gender, consumption tendency, and individual characteristics.
나노 인덴테이션 시험에서의 탄소성 재료의 파일업/싱크인 특성
김병민(Kim Byung Min),이찬주(Lee Chan Joo),이정민(Lee Jung Min),이상진 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Over the past decade, many computational researches have been performed to investigate quantitative relationships between load-displacement and material properties. But piling-up which causes errors to estimate mechanical material properties remains the most significant unresolved issue in nano-indentation test. This study has estimated quantitative aspects of the effects of material properties, especially work hardening exponent, on piling up/sinking in response of various materials. Using FE Analysis, piling up/sinking in response when material is indented by sharp indenter is investigated to evaluate the effects of material properties. From the FE analysis result, quantitative relationships between piling up/sinking in height and material properties is assessed using dimensional analysis which is used to define scaling variables and universal functions. And nano-indentaion test is performed to verify this relation on various materials. From the result of comparison with prediction from dimensional function and experiment, the work hardening exponent was found to have greater influence on the piling up/sinking in height during the nano-indentation than other material properties, such as elastic modulus and yield stress.