근거이론적 접근을 통한 대학승마선수들의 은퇴 후 진로전환에 대한 교육적 탐색

김동학(Kim, Dong-Hak),김동환(Kim, Dong-Whan),장주선(Jang, Ju-Sun) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.2

The purpose of this study is to provide a basic data for university equestrian players’ career transition after retirement by finding out about their career transition process and analyzing their experiences in depth to explore their pedagogical values and meanings. The method of grounded theory method was used to achieve the purpose of this study. To achieve the purpose of this study, 7 research participants from 3 universities were selected by using theoretical sampling method. And the in-depth interviews which were conducted by 2~3 times from June 2018 to September 2018 were used as the main data. First, a total of 77 concepts, 16 sub-categories and 7 top categories were derived through open coating. Second, axial coding reveals paradigm elements of the causal conditions, the situational context, the central phenomena, intervening conditions, interaction strategies, and the consequences. Third, through the selection coding, ‘Career transition after retirement’ and ‘Pedagogical meaning’ were derived.

전열을 이용한 금형가열코어의 제작 및 이를 이용한 성형품의 제조와 평가

김동학(Kim Dong-Hak),류지원(Ryu Ji-Won),손영곤(Son Young-Gon) 한국산학기술학회 2006 한국산학기술학회논문지 Vol.7 No.4

본 연구에서는 전열을 이용한 금형가열 장치를 설계 및 제작하였다. 서로 다른 가열원을 가진 세 가지 방법으로 제작을 하여 시간에 따른 온도 프로파일을 조사함으로써 그 성능을 평가하였고, 이를 이용하여 사출성형품을 제조하여 수축률, 밀도, 표면 거칠기, Weld line등을 측정하여 실용적인 적용 가능성을 조사 하였다. 가열시간(l30℃ 도달시간 14초) 및 사이틀 타임(55초)은 실용화가 가능한 수준으로 나타났다. 일반 사출성형방식으로 성형한 제품과 비교했을 때 수축률은 전열을 이용한 가열방식으로 사출한 성형품이 5.1% 감소하였고, 밀도는 2.66% 증가하였다. 표면 거칠기는 3배 이상 향상 되었고, 일반 사출에서 나타나던 Weld line은 전열가열방식에서는 나타나지 않았다. In this study we developed the electrical heating mold core by applying three different heating methods. In order to find out the optimal heating method, we observed the temperature profiles with time. We also injection-molded the parts by the heating methods and investigated the shrinkage ratio, density, surface roughness and weld-lines. The temperature rise time and cycle time showed the promising results for commercial applications(the rise time is 130℃/14sec, the cycle time is 55sec). By comparing with the conventional and gas flame heating method, the parts by this method were proven to have good qualities. The shrinkage ratio reduced by 5.1%, the density increase by 2.66%, the smoothness increased about 3 times, and the weld-line did not observed by naked eyes.

고교 볼링선수-지도자의 교환관계(LMX)가 운동몰입 및 학교생활태도에 미치는 영향

김동학(Kim, Dong-Hak),김동환(Kim, Dong-Whan),김현민(Kim, Hyun-Min) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.2

The purpose of the high school bowling player-Leader Member Exchange (LMX) is to find out the effect on athletic immersion and school behavior. In the study, 203 surveys were collected, and athletes registered with the Korea Bowling Association were selected. For statistical processing methods, frequency analysis, reliability analysis using Cronbach"s a factor, exploratory factor analysis, correlation analysis, and multiple regression analysis were performed using SPSS 24.0. The results are as follows. First, it has been shown that the contribution of LMX does not affect the invasion of motion. It has also been shown that the professionalism respect of LMX affects exercise immersion. Second, the analysis of the effects of LMX on class attitudes shows that LMX does not affect class attitudes. Third, it has been shown that LMX`s contribution affects class comprehension. It turns out that LMX`s professionalism respect does not affect class comprehension. Fourth, it has been shown that LMX`s contribution affects school performance. It turns out that LMX"s professionalism respect does not affect school performance.

ScienceDMZ 기반 고성능 네트워킹 환경에서 분산 AI 추론 성능 비교 연구

김동학(Dong Hak Kim),문정훈(Jeong Hoon Moon) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6

본 논문은 과학기술분야에서 관측, 실험장비의 비약적인 발전으로 과학빅데이터가 폭발적으로 증가하고 있으며 IT 를 비롯한 인공지능 기술의 발전으로 과학빅데이터의 분석 기법이 고도화 되고 있는 가운데 과학빅데이터에 대해 인공지능 기반의 GPU와 FPGA의 분석 및 추론 성능에 대한 비교 연구이다. 특히 과학빅데이터의 고속전송, 인공지능 기반의 분석, 공유 기술은 4 차산업시대의 핵심 기술이며, 이를 위한 다양한 IT 인프라와 기술체계가 구현되고 있는데, 본 논문에서는 이러한 여러 기술 체계 중빅데이터 고속도로 체계인 ScienceDMZ 기반의 고속전송 전용 노드인 DTN(Data Transfer Node) 상에서의 인공지능 학습과 추론 성능 비교연구로서 GPU 기반 DTN과 FPGA 기반 DTN 시스템의 성능을 비교 분석 하였다. 또한, 분석한 결과를 토대로 FPGA 가속기 카드가 적절히 활용될 수 있는 분야를 제시함과 동시에 ScienceDMZ 기반의 고성능 자원화 환경을 구축하는 방향성을 제시한다. 향후 ScienceDMZ 기반의 연구플랫폼 간 대규모 분산 환경에서의 인공지능 학습 및 추론을 위한 컴퓨팅 환경을 제안하였다.

하이드로포밍 공법을 이용한 경량차체 루프레일 개발

김동학(D. H. Kim),김광순(K. S. Kim),김윤규(Y. K. Kim),차문수(M. S. Cha),성경진(K. J. Sung) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10

청소년의 태권도수련활동이 학업성취도 및 자아정체감에 미치는 영향

김동학(Dong-Hak Kim) 경희대학교 스포츠과학연구원 2008 태권도과학 Vol.1 No.2

The purpose of the study was to examine the influences of Taekwondo participation on selfidentities and academic achivement of adolescents. Participants for this study were 700 of 17~19 aged adolescents. Of participations valid data were 625. They completed a modified inventory of the self-identities and academic achivement. More details, Self-identities Scale modified Kim(1989), and Academic Achivement Scale modified by Yoo(2000) were using to investigate the purpose of this study. Results were analysed in quantitative approaches. Data were collected through self-administered survey. The most four meaningful results of the study were as follows; First, there was influenced to relationship between participation of Taekwondo and self-dentity. Second, there was influenced to relationship between participation of sport for all and academic achivement. Third, there was influenced to relationship between self-identity and academic achivement. Fourth, there was influenced to causual relationship among participation of sport for all, self-identity and academic achivement.

다문화 청소년들의 스포츠 프로그램 참여 경험에 관한 근거이론적 접근

김동학(Kim, Dong-Hak),남윤신(Nam, Youn-Shin) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.3

The purpose of this study is to present the process of experience as a theoretical paradigm through the empirical and in-depth analysis of the experience of participating in a sports program of multicultural youth. To execute the study, a grounded theoretical approach was used. As a result, the participants of the study were selected, fifteen of them were multicultural youths who their parents’ country of origin is from the China, Uzbekistan, Pakistan, England, Russia, two researchers who are program operators, and two lecturers, a total of nineteen participants were selected as the study participants. Interviews were utilized as the main data. The collected data are derived to obtain the results through the following theoretical analysis methods: open coding, axial coding, and selective coding. First, through the open coding, a total of sixty-nine concepts, thirteen subcategories, and six top categories were derived respectively. Second, we found six paradigms of casual condition, contextual context, central phenomenon, interventional condition, interaction strategy, and result through axis coding. Third, through the selection coding, we derived the core category of ‘Multiculturalism from One Culture’ and presented the theoretical paradigm through the outlined story.

다문화청소년들의 사회통합을 위한 스포츠 프로그램 개발연구

김동학(Kim, Dong-Hak),신상현(Shin, Sang-Hyun) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.4

The purpose of this study is to develop a sports program for social integration of multi-cultural youth. To do this, we conducted the following five steps of development process. In the first stage of goal setting, the satisfaction knowledge(pleasure), performance knowledge(physical), relationship knowledge(affective), conceptual knowledge(cognitive), four goals were set as goal elements of sports program for social integration through investigation and analysis of expert group and learner needs. The second stage program consisted of ten lecture programs in consideration of learner, instructor, facilities and curriculum. The program consisted of know-my-body, matting exercise, sports dodge ball, flying disk, broadcast dance, kin ball, ball game, golf, horse riding, and athletic track meet. In the application of the third stage program, the ten lecture programs was applied to thirty multi-cultural youth. In the fourth stage of verification and evaluation, analysis was made by the participants’ reports, interviews, and observation logs. As a result, satisfaction knowledge, performance knowledge, relationship knowledge, and conceptual knowledge were derived and knowledge of social integration was derived through categorization. In the fifth stage of final development, the program consisted of eighteen programs in total, including two programs in 10th grade with four elements of sports participation goal and knowledge of social integration. The contents consisted of initiation of know-my-body, physical moving, team-play 1, team-play 2, play with music, new sports 1, new sports 2, outdoor sports, sports favorites, and sports festival.

AODV기반의 지역경로탐색을 이용한 노드 비중첩 다중 경로 검색 기법

김동학,김영락,김종근,Jin, Dong-Xue,Kim, Young-Rag,Kim, Chong-Gun 한국정보처리학회 2007 정보처리학회논문지 C : 정보통신,정보보안 Vol.14 No.1

모바일 Ad hoc 네트워크에서 AODV와 DSR을 포함한 대표적인 표준 라우팅 프로토콜들은 대부분 난일 최단 경로를 구축하고 사용한다. 이러한 단일 경로 라우팅은 경로가 단절되었을 때 경로를 처음부터 다시 재구축해야 하는 번거로움과 이에 따른 부하 발생이 불가피하다. 이런 문제점들을 해결하기 위한 방법으로 빠른 대체 경로 이용이 가능한 다중 경로 라우팅 프로토콜에 관한 연구들이 활발하게 진행되고 있다. 본 논문에서는 AODV 기반의 지역 경로 탐색에 의한 노드 비중첩 다중 경로 검색 기법을 제안한다. 이는 송신지로부터 수신지로의 완전 분리된 노드 비중칩 다중 경로들을 최대한 많이 찾아 구축함으로 경로의 강건함을 확보하고 보다 안정적인 라우팅을 제공한다. In mobile ad hoc networks the most popular on demand routing protocols are the Dynamic Source Routing (DSR) protocol and the Ad hoc On demand Distance Vector (AODV) routing protocol. These and other representative standard routing protocols are designed to find and maintain only a single path. Whenever there is a link break on the active route, source node has to invoke a route discovery process from the beginning and it causes a lot of overhead. Multipath routing protocols, which can alleviate these problems by establishing multiple alternative paths between a source and a destination, are widely studied. In this paper we propose a node disjoint multipath discovery technique based on AODV local route discovery. This technique can find and build completely separated node disjoint multi paths from a source to a destination as many as possible. It will make routing more robust and stable.

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.