Newton 유체의 방사공정에서의 운동학적 파동

김병민,현재천 ( Byung Min Kim,Jae Chun Hyun ) 한국화학공학회 1996 화학공학의이론과응용 Vol.2 No.1

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.

기계식 프레스에 의한 자동차 시트 리클라이너의 고정밀 플레이트 홀더 개발(Ⅱ)

김병민(Byung-Min Kim),최홍석(Hong-Seok Choi),장명진(Myung-Jin Chang),배재호(Jae-Ho Bae),김동환(Dong-Hwan Kim),고대철(Dae-Cheol Ko) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.7

Burr generated on plate holder should be removed through additional process, because it has an influence on the function of automotive seat recliner. The process layout to perform simultaneously embossing and half blanking of plate holder has been developed in this study in order to minimize the influence of burr formation. The optimal process condition to satisfy the required dimensional accuracy of plate holder has been determined using Taguchi method and finite element analysis. It has been shown from experimental results that the proposed method is decidedly superior to the previous FCF method from the aspect of sheared surface, roll-over, flatness and burr height.

사회과학연구 : 서울특별시 자치구의 사회복지예산 변화 영향요인에 관한 유형화:퍼지셋 이상형 분석의 적용

김병민 ( Byung Min Kim ),신동면 ( Dong Myeon Shin ) 경희대학교 사회과학연구원 2015 社會科學硏究 Vol.41 No.1

본 논문은 서울특별시 25개 자치구를 대상으로 퍼지셋 이상형 분석(Fuzzy-set ideal type analysis)을 사용하여 자치구의 사회복지예산 변화에 영향을 미치는 요인에 대한 유형화를 시도하였다. 퍼지셋 이상형 분석에서 결과조건은 자치구의 사회복지예산 비중이며, 이는 자치구의 일반회계예산 대비 사회복지예산 비중으로 측정하였다. 원인조건은 재정적 요인, 정치적 요인, 인구사회적 요인이며, 자치구의 재정자주도, 진보정당투표율, 기초생활수급자수, 노인인구비율, 영유아인구비율을 지표로 활용하였다. 세 가지 원인조건으로 조합 가능한 총8개 유형을 자치구 사회복지예산 변화의 원인조건 이상형 유형으로 설정하였다. 분석 결과 총 8개 이상형 중 25개 자치구들을 4개의 이상형 유형(충족모형, 정치수요모형, 공급모형, 정치모형)으로 분류할 수 있었다. 퍼지셋 이상형 분석을 통해 세 가지 연구 결과를 얻을 수 있었다. 첫째, 자치구의 재정적 요인(재정자주도)은 정치적.인구사회적 원인요인과의 조합 여부와 상관없이 사회복지예산 비중에 부(-)의 상관관계를 보인다. 둘째, 정치적 요인은 자치구의 사회복지예산 비중에 부분적 영향을 미친다. 특히 정치적 요인이 결여될 경우, 자치구의 복지지출 비중이 높지 않게 나타났다. 셋째, 인구사회적 요인은 정치적 요인과 결합한(정치수요모형) 경우, 복지지출 비중에 유의미한 영향을 미쳤다. 본 연구의 분석 결과로부터 서울특별시 자치구의 사회복지예산 확대에 따른 자치행정의 과제로 현재의 ‘국.시비 보조금 기준보조율’제도에 대한 개선안을 제안하였다. In this study, we propose a fuzzy-set ideal type analysis to classify the types of the influence factors on social welfare budgets in the autonomous districts(Gu) in Seoul Metropolitan City. The outcome is social welfare budget in the 25 autonomous Gus in Seoul, which is measured as a share of social welfare budget in the total budget of the autonomous Gus. The causal conditions are composed of three factors: fiscal factor, political facto and socio-demographic factor. They are measured by using indicators as follows; fiscal independence ratio, voting rate for progressive parties, number of national basic livelihood beneficiaries, ratio of elderly people aged 65 and more, ratio of infants. In the analysis, the combinations of causal conditions are 8 types, which are used for the classification of 25 Gus with regard to the influence factors for social welfare budgets. By analysing the social welfare budgets of 25 Gus between 2010 and 2014, we identify four ideal types such as sufficient model, political and demand model, supply model, and political model. The following research findings need attention. First, the fiscal independence ratio of Gu is negatively associated with the ratio of social welfare budget irrespective of the causalconditions of political and socio-demographic factors. Second, political factor has a partial impact on the ratio of social welfare budget. In case of the combinations of casual conditions without political factor, the ratio of social welfare budget is more likely to be lower. Third, when socio-demographic factor has made the combinations of causal conditions with political factors, it has a significant impact on the ratio of social welfare budget. Based on the above findings, we propose an alternative measure for the local district, Gu, to reform the existing standard rates of national and regional subsidies.

온라인강의에서의 수업의 질, 자기효능감, 학습자 충성도의 관계 및 전공과 아르바이트 활동에 따른 차이 분석

김병민(Kim, Byung-Min),강유원(Kang, Yu-Won) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.2

The purpose of this study was to identify the relationship between the quality of classes, self-efficacy, and learner loyalty of college students who took online university lectures, and to determine whether there was a difference in the level of perception of variables according to their major and part-time job activities. For the data processing of this study, frequency analysis, reliability analysis, one-way ANOVA, simple regression analysis, and multiple regression analysis models were performed using SPSS 24.0. As a result, first, the class content and the classroom environment had a positive effect on the sense of self-efficacy, and the interaction showed a negative influence on the sense of self-efficacy. Second, it was found that the classroom environment and interaction had a positive effect on learner loyalty. Third, it was found that self-efficacy had a positive effect on learner loyalty. Fourth, students of physical education major showed high class content, class environment, and learner loyalty. Finally, the group who did not engage in part-time job activities sometimes showed higher class quality and learner loyalty than one group. In accordance with these contents, it is necessary to prepare a plan for improving the quality of classes, such as collecting various demands of students and providing a learning design and an appropriate environment suitable for the provision of high-quality educational services for online classes at universities.

골프의 문화적 이해와 제 길 찾기

김병민(Kim, Byung-Min),강유원(Kang, Yu-Won) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.4

As the general public have taken a higher interest in the golf, it has been positioned as the leisure sports, not the sports for a few social strata alone. Therefore, this study was intended to help people understand the golfing culture through its understanding and the societal awareness of the golf and to present the development of the golfing culture and its future direction. For the purpose of this study, the expert group composed of one in the golfing industry, one in the broadcasting circles and one professional golfer and five ordinary golfers were selected. And the qualitative study was conducted through the in-depth interview method. As a result, it was found that many people had a negative awareness of the golfing culture though the golfing population accounted for about 6,000,000 persons. The reason that the negative view of the golfing culture still exists much is that high greens fees have been charged as the golf course is defined as the luxury facility for a long time and that people have responded negatively to it due to the possibility of environmental disruption by the use of fertilizers for the protection of the lawn. In addition, it can be said that high-priced equipment, high greens fees, luxurious facilities, caddie fee and the like are the elements that cause a great number of people to disregard the golf. This sociocultural factor is becoming a great factor impedimental to the popularization of the golf. Accordingly, it is thought that it is necessary to consider improved awareness of the golfing culture through social consensus, the reduction of economic burdens, the provision of social/institutional equipment, countermeasure for the environmental problem and the like could help the golfing culture develop as the popular sport.

야구동호인의 관여도 수준에 따른 정보탐색경로 및 구매결정요인 분석

김병민(Kim, Byung-Min) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.1

This study was for having ideas about the analysis of information search channel for equipment and purchasing decisions factors according to level of engagement regarding baseball clubs. The survey was investigated on 420 people who were participated in the baseball league of citizens, and information search channel was composed of 3 sub-variables, purchasing decision factors were composed of 5 sub-variables, surveys are analyzed by the statistics computer program ‘SPSS 24.0’ for analysing causal relationship with factors via one-way ANOVA, correlation analysis, and multiple regression analysis. The result shows that there were differences in baseball career, tournament frequency, practice frequency and involvement. Also there were related in online, other media channel, purchasing decisions factors such as purchase channel, promotion, service, and price for involvement. Function factor affects online channel, promotion factor affects offline, online/other media channel, and service factor affects offline channel. As mentioned, involvement of baseball clubs was important variable which affects the information search channel and purchasing decisions factors, and information search channel was affected by purchasing decisions factors. This is recognized that it can be a basis for proposing basic standards for baseball goods market.

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.

Loop Delay Analysis of All-Digital Phase-Locked Loop using Verilog Behavioral Simulation

Byung-min Kim(김병민),Deog-kyoon Jeong(정덕균) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1

팬데믹 상황에서 예체능 전공 대학생의 온라인 수업에 대한 학업 정서가 학습성과에 미치는 영향

김병민 ( Kim¸ Byung Min ) 한국체육학회 2021 한국체육학회지 Vol.60 No.2

본 연구는 코로나19로 인한 팬데믹 상황에서 온라인 수업을 수강한 예체능 전공 대학생의 학업 정서가 인지된 성취도 및 학습만족도에 미치는 영향을 규명하는 데 그 목적이 있다. 본 연구의 결과 도출을 위하여 수집된 자료는 SPSS 24.0과 AMOS 22.0을 이용하여 처리하였고, 빈도분석, 신뢰도분석, 상관관계 분석, 확인적요인분석, 구조방정식 모형 검증을 실시하였다. 연구 결과는 첫째, 즐거움, 자부심, 지루함 정서와 인지된 성취도에서 유의한 영향 관계를 나타냈다. 둘째, 즐거움과 화 정서는 학습만족도에 유의한 영향을 미치는 것으로 나타났다. 셋째, 인지된 성취도는 학습만족도에 유의한 영향을 미치는 것으로 나타났고, 인지된 성취도는 자부심과 학습만족도와의 관계에서 완전매개효과가 나타났다. 이러한 결과에 따라 학업 정서는 학습성과에 영향을 미치는 주요 변수임을 확인하였고, 학습자의 성취도와 만족도를 높이기 위하여 학생들의 정서를 고려한 체계적이고 전략적인 학습설계 및 교수법 등이 필요하다. 또한 포스트 코로나 이후에도 학생들의 학습성과를 향상하기 위한 다양한 전략이 요구된다. The propose of this study was to investigate the effects learning emotions of college students majoring in arts and sports who took online classes a pandemic situation caused by of COVID-19 on perceived achievement and learning satisfaction. To derive the results of this study, data were processed using SPSS 24.0 and AMOS 22.0, and frequency analysis, reliability analysis, correlation analysis, confirmatory factor analysis, and structural equation model equation model verification were performed. The results of the study were as follows: First, enjoyment, pride, and boredom had a significant effect on perceived achievement. Second, enjoyment and anger had a significant influence on learning satisfaction. Third, perceived achievement effect on learning satisfaction, the perceived achievement showed a complete mediating effect in the relationship between pride and learning satisfaction. Based on these results, it was confirmed learning emotion is a major variable influencing learning outcomes, in order to increase learner achievement and satisfaction, systematic and strategic learning methods that consider students’ emotions are needed. In addition, various strategies are required to improve student learning outcomes even after the post-corona.