ISOFIX방식에 따른 어린이 탑승자 안전도 연구

김동학(Donghak Kim),윤영한(Younghan Youn),이재완(Jaewan Lee) 대한기계학회 2002 대한기계학회 기타 간행물 Vol.2002 No.11

국가자격 생활스포츠지도사 양성과정 개선을 위한 근거이론적 접근

김동학 ( Donghak Kim ) 한국체육학회 2020 한국체육학회지 Vol.59 No.4

이 연구는 대한민국 국가자격 생활스포츠지도사 양성과정을 경험한 연수생과 현장 강사들의 생생한 이야기를 통해 중심현상을 발견하고 어떤 맥락이 나타나며, 어떠한 상호작용 과정을 거쳐 개선될 수 있는지 구성주의 관점의 이론적 틀을 제시하여 생활스포츠지도사 양성과정의 개선방안을 탐색하는데 목적이 있다. 이를 위해 연구의 목적을 이해하고, 연구 참여에 동의한 15명(다종목)을 연구참여자로 선정하였고, 연수과정에서 이론강사 2명과 현장실습 강사 2명도 연구참여자로 선정하여 보다 객관적이고 심도 깊은 이야기를 수집하였다. 수집된 자료들은 근거이론 분석방법인 개방코딩, 축코딩, 선택코딩의 과정을 거쳐 다음과 같은 결과를 도출하였다. 첫째, 개방코딩을 통해 105개의 개념, 하위범주 22개, 상위범주 6개를 도출하였다. 둘째, 축코딩을 통해 인과적 조건, 상황적 맥락, 중심현상, 중재적 조건, 상호작용 전략, 결과의 6가지 패러다임 요소를 발견하고 범주들 간의 관계를 규명하였다. 셋째, 선택코딩을 통해 핵심범주인 ‘정책적 지원과 내실 있는 연수과정을 통해 스포츠지도사의 전문역량 함양과 스포츠 일자리 창출’을 도출하여 이야기 윤곽을 통해 대한민국 국가자격 스포츠지도사 양성과정에 관한 근거이론을 제시하였다. 마지막으로 향후 발전을 위해 정책적 개선과 지원을 서둘러 준비할 필요가 있다. This study aims to explore ways to improve the life sports instructor training course with presenting a theoretical framework from the perspective of constructivism from discovering the central phenomenon and what contexts can be improved with interaction process through the stories of trainees and field instructors who have experienced the training course of the national life sports instructor qualification. 15 people (multi-items) who understood the purpose of the study and agreed to participate in the study were selected as research participants, and two theoretical instructors and two field instructors were selected as research participants during the training process to collect objective and in-depth stories. The following results were obtained through the process of open coding, axial coding, and selective coding, which are methods of analyzing the grounded theory. First, 105 concepts, 22 lower categories, and 6 upper categories were derived through open coding. Second, through axial coding, six paradigm elements of causal condition, situational context, central phenomenon, interventional condition, interaction strategy, and outcome were discovered, and relationships between categories were identified. Third, through the selective coding, the core category ‘Development of professional competence of sports instructors and creation of sports jobs through policy support and substantial training courses’ were derived, and the story was outlined to present the grounded theory of the national sports instructor training course. Finally, it is necessary to expedite to prepare for policy improvement and support for future development.

스포츠지도자 양성을 위한 PBL 기반 체육대학 전공수업 연구

김동학 ( Kim Donghak ),김동환 ( Kim Dongwhan ) 한국체육학회 2021 한국체육학회지 Vol.60 No.3

이 연구는 스포츠지도자 양성을 위한 PBL 기반 체육대학 전공수업을 연구사례로 설정하여 향후 PBL 수업을 활용한 스포츠지도자 양성을 위한 수업모형의 기초자료를 제공하고자 한다. 이를 위해 스포츠지도사 양성 및 역량강화를 위해 개발된 수업에서 6명이 연구참여자가 선정되었고, 연구자가 직접 수업으로 개발하고 진행하였다. 연구 결과 ‘PBL 교수되기’에서는 권위적이지 않으면서 유연한 태도를 유지하고, 학생들과 지속적으로 의사소통하며 학습자의 의견을 적극적으로 반영한다. 둘째, ‘PBL 수업모형’에서는 교수자의 역할 수행과 학습자들의 자기주도 학습을 통하여 PBL 학습목표를 달성할 수 있는 수업모형을 개발하였다. 셋째, ‘PBL 문제개발’에서는 학습자들에게 최적의 학습효과를 구현하기 위해 연계성 있는 문제 세 가지를 개발하였다. 넷째, ‘PBL 활동’으로 7번의 발표에 전 팀원이 직·간접적으로 참여하여 모두 7번의 새로운 경험을 하였다. 다섯째, ‘PBL 결과’에서는 교수의 역할수행, 학습자의 PBL 활동이 결합하여 기대 이상의 결과가 도출되었다. 여섯째, ‘PBL 평가’에서는 수평적 평가문화를 접목하여 다양한 방식으로 평가가 이뤄진다. 마지막으로 더 많은 PBL 수업 사례가 체육학을 중심으로 연구되어져야 하며, 가칭 ‘스포츠 PBL 문제은행’이 개발되어 교수들로 하여금 PBL 수업 적용에 용이한 교육콘텐츠를 제공해 줄 필요가 있다. This study aims to provide basic data for a teaching model for cultivating sports leaders using PBL classes in the future by setting PBL-based sports major classes at university for cultivating sports leaders as a research case. In the class developed to train sports leaders and strengthen their competencies, six research participants were selected, and the researcher developed and conducted it as a class. As a result of the study, in ‘Becoming a PBL professor’, maintains a flexible attitude without being authoritative, communicates continuously with students, and actively reflects the opinions of learners. Second, in the ‘PBL instructional model’, a instructional model that can achieve the PBL learning objectives was developed through the role of instructors and the learners’ self-directed learning. Third, in the ‘PBL Problem Development’, three related problems were developed to realize the optimal learning effect for learners. Fourth, all team members participated directly and indirectly in the seven presentations as “PBL activities,” and all seven new activities will be experienced. Fifth, in the ‘Report on PBL Results’, the performance of instructor’s role and learner’s PBL activities are combined, resulting in more than expected results. Sixth, in the ‘PBL evaluation’, evaluation is performed in various ways by incorporating a horizontal evaluation culture. Lastly, more cases of PBL classes should be studied centering on physical education, and a tentatively named “Sports PBL Problem Bank” needs to be developed to provide educational contents that are easy for instructors to apply for PBL classes.

초음파 처리와 분말 크기가 재생 폴리프로필렌/폐타이어 분말 복합체의 기계적 특성에 미치는 영향

김동학,김성길,이민지,박종문,오명훈,김봉석,김진국,방대석,Kim, Donghak,Kim, Seonggil,Lee, Minji,Park, Jong-Moon,Oh, Myung-Hoon,Kim, Bong-Suk,Kim, Jinkuk,Bang, Daesuk 한국자원리싸이클링학회 2015 資源 리싸이클링 Vol.24 No.2

본 연구에서는 초음파 처리기가 die에 장착된 일축 스크류식 압출기를 이용하여 다양한 크기의 폐타이어 분말을 탈황시켰고, 치합형 이축 스크류식 압출기를 이용하여 재생 폴리프로필렌/탈황된 폐타이어 분말 복합체를 제조하였다. 40, 80, 140 mesh 크기의 탈황되지 않은 폐타이어 분말과 탈황된 폐타이어 분말의 가교밀도와 탈황도를 계산하였고 각각의 기계적 특성을 비교하였다. 또한, 재생 폴리프로필렌과 탈황 전과 탈황 후의 폐타이어 분말 복합체에 대한 상용화제 SEBS-g-MA의 효과를 조사하였다. 가교밀도는 폐타이어 분말의 크기가 작아질수록 감소하였다. 반면에 탈황도는 작은 크기의 폐타이어 분말이 첨가될수록 증가하였다. 탈황된 폐타이어 분말이 첨가된 복합체의 인장강도, 충격강도, 신장률은 탈황되지 않은 폐타이어 분말이 첨가된 복합체보다 크게 증가했으며 첨가된 폐타이어 분말의 크기가 작을수록 복합체의 기계적 특성이 더욱 향상되었다. 재생 폴리프로필렌과 탈황 전과 탈황 후의 폐타이어 분말 복합체에 SEBS-g-MA를 첨가하였을 때 충격강도와 신장률이 큰 폭으로 증가하는 것이 관찰되었다. In this study, various sizes of waste ground rubber tire (WGRT) were devulcanized by a single screw extruder equipped with a sonicator in front of the die, and waste PP and devulcanized waste ground rubber tire (DWGRT) composites were prepared by an intermeshing co-rotating twin screw extruder. The crosslink density and percent devulcanization of WGRT and DWGRT for 40, 80 and 140 meshes were calculated. The mechanical properties of the composites were compared with each other. The effect of SEBS-g-MA as a compatibilizer was investigated on mechanical properties of both waste PP/WGRT and waste PP/DWGRT composites. The crosslink density was decreased with decreasing the WGRT size. On the other hand, the percent devulcanization was increased by adding the smaller size of WGRT. Also, tensile strength, impact strength and elongation at break of the composite with DWGRT were higher than those with WGRT. Especially, mechanical properties of the composites were significantly increased by adding the smaller size of WGRT and DWGRT. Addition of SEBS-g-MA into both waste PP/(D)WGRT composites exhibited better impact strength and elongation at break than the composites themselves.

ISOFIX방식에 따른 어린이 탑승자 안전도 연구

김동학(Donghak Kim),윤영한(Younghan Youn),이재완(Jaewan Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11

To impreve Child Occupant safety, US adopt a requirement for universal, uniform anchor systems for child restraints, an enormous effort of some child seat manufacturers tried to improve the protective properties of Child Restraint System(CRS). The new standard includes FMVSS 225, Child Restriant Anchorage Systems and Amendments to FMVSS 213 came into effect in 1999. The rules of universal anchor are to provide devices which are independent of safety belts to attach child restraints to the vehicle. It will allow child restraints are anchored more securely than those are often possible with current safety belts. Recently, US, Australia and Euripean community countris including Japan have started testing of evaluation of CRS performances during their NCAP test programs and results were published.<br/> Koran govemment realized the importacne of CRS roles in child safety and investigate benefits of enhancements of CRS regulations. In this study, four kinds of ISOFIX were simulated by commercial program as well as the current CRS and were evaluated in order to verity their safety for Child Occupant.

리어범퍼 튜블러백빔 연구

김현경(Hyungyung Kim),이기수(Kisoo Lee),김동학(Donghak Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5

A new point of view in bumper frame is proposed by tubular structure, which is a new development base on the principle of hot-stamping steel, structural design, test evaluations. As a result of the application of new bumper frame, this paper classifies the tubular ladder frame design with 6 sigma Taguchi’s quality engineering method and with 3 positive effects into rear bumper of automotive vehicles about RCAR.

경량화를 위한 핫스템핑 파이프 백빔 연구

김현경(Hyungyung Kim),오영섭(Youngsup Oh),송대준(Daejun Song),오승택(Sengtaek Oh),김동학(Donghak Kim),이동열(Dongyul Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

A new point of view in vehicle bumper frame is proposed by Contacted 2 Pipes BUMPER STRUCTURE, which is a new development method based on the principle of hot-stamping, structural design, method of TRIZ and evaluations. As a result of the application of new bumper frame, this paper classifies Increased of strength to 1.8GPa, Shapes of Cold Coiled Thin Pipe, optimized structural design, and enhanced performance of RCAR, Towing and Shipping.

핫스템핑 냉연파이프 백빔 성능 연구

김현경(Hyungyung Kim),강병훈(Byunghun Kang),박석재,오영섭(Yeongsup Oh),김동학(Donghak Kim),Sunghei Jung 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11

A new point of view in vehicle bumper frame is proposed by Contacted Pipes BUMPER STRUCTURE, which is a new development method based on the principle of hot-stamping, structural design, method of TRIZ and evaluations. As a result of the application of new bumper frame, this paper classifies Increased of strength to 1.78GPa, Shapes of Cold Coiled Thin Pipe, optimized structural design, and enhanced performance of RCAR, Towing and Shipping.

파이프 크래쉬박스 충돌변형 연구

김현경(Hyungyung Kim),강병훈(Byunghun Kang),박석재,오영섭(Yeongsup Oh),김동학(Donghak Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

A new point of view in vehicle crash box is proposed by Contacted 2 Pipes structurce, which is a new development method based on the principle of shear-deformation, shear-broken of welding, structural design, method of TRIZ and evaluations. As a result of the application of new crash box, this paper classifies increased absorption energy of collision, deformation of pipes, and shears broken force in welding, optimized structural design, and enhanced performance of RCAR.

냉간성형 전처리에 의한 핫스탬핑 공법 개발요

김효섭(HyoSub Kim),김광순(KwangSoon Kim),남승만(SeungMan Nam),김동학(DongHak Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11