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오영현,류현정,김태정,최민수,이태선 대한금속·재료학회 2019 대한금속·재료학회지 Vol.57 No.11
Resistance Element Welding (REW) is a novel processing technology developed to join dissimilar materials such as aluminum and steel. It uses an auxiliary steel rivet (element) inserted into an aluminum sheet that forms a resistance spot weld with the steel sheet, and the aluminum work piece is mechanically joined by the interlocking rivet. The versatility and agility of REW is advantageous, especially in the automotive industry. However, the head of the rivet often extends out externally over the work piece, and the misalignment of the electrode with the head can be problematic since inserting the head and the weld are performed in separate stages. In the present paper, we performed REW using a headless rivet which has minimal to no overhanging part above the aluminum surface. The lap-shear strength of REW is higher than self-piercing rivets, which makes REW a promising solution for extending applications of multi-material structures. The microstructure of the joint involves a fusion zone which mainly consists of martensite, and the failure occurs near the heat affected zone. This study finds that the electrode-rivet alignment needs to be optimized to manage the optimal nugget size and to avoid current arcing through the aluminum work piece.
오영현,송영혜 대구대학교 특수교육재활과학연구소 2009 再活科學硏究 Vol.27 No.1
본 연구는 공격성향의 시설아동을 대상으로 분노조절 프로그램을 실시하여 공격성의 변화를 보는 것이다. 연구대상은 K군 소재 청소년의 집에서 생활하는 초등학교 6학년 아동으로 선정방법은 ‘공격성 진단 검사’와 ‘공격욕구검사’로 공격성의 정도가 심한 아동 6명을 선정하여 실험집단과 통제집단에 각각 3명씩 무선배정 하였다. 프로그램은 이완활동, 문제해결훈련을 지도하는 토론, 회기 목표와 관련된 구조화된 활동, 자유놀이 단계로 구성되었다. 프로그램의 참여도를 높이고 최상의 학습 상태를 받아들일 수 있도록 하기 위해 프로그램 초반에 이완활동으로 신체적․정서적 긴장을 해소하고 즐거움을 주는 신체놀이를 했다. 분노조절을 위해 사회적 기술훈련, 인지-행동적 접근, 자기교시훈련, 자기주장훈련과 문제해결 기술훈련, 긴장이완훈련의 보편적인 방법을 사용하였고, 프로그램의 진행은 한 회기 60분, 주 2회, 총 10회기 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 분노조절 프로그램은 공격성 검사에서 공격성을 감소시켰고 하위영역의 공격행동(신체적, 언어적, 우회적공격성, 부정성, 흥분성, 적의성)을 모두 감소시켰다. 둘째, 회기 내에서 시설아동의 공격행동(신체적, 언어적, 우회적공격성, 부정성, 흥분성, 적의성)을 감소시켰다. The aim of the study is to examine changes in aggression level of the aggressive children residing in an institution by applying an anger control program. Children residing in an Institution for Minor in K county who were in the sixth grade of the elementary school were subjected to an 'aggression diagnose test' and a 'desire for aggression test.' Total six children with high aggression scales were selected by the test, and three were randomly assigned in a control group and the rest three in a test group. The program was comprised of relaxation activity, discussion to guide problem solving ability, structured activity related to a goal specific to each session, and free play. To encourage an active participation in the program and enable an optimal reception of the learning, a relaxation activity with fun physical play was conducted at the beginning of the program for releasing physical and emotional tension. A universal method was used to control anger including cognition-behavioral approach and training for social skill, self-instruction, self assertion, problem solving skill, and tension release. The program was implemented twice a week for 60 minutes per session for ten weeks in total. The research tasks were as follows: first, to examine whether the anger control program reduces aggression of the children in an institution; second, whether the program reduces physical, verbal, and indirect aggression, denial, rage, or hostility as sub-categories of the aggression; and third, whether the program reduces aggressive behavior of the institutionalized children within a session. Changes of the aggression according to the research tasks were measured and compared before, after, and as a follow up of the program. To measure aggressive behavior such as physical, verbal, indirect aggression, denial, rage, and hostility, frequency of such aggression was recorded in a free play environment. The results of the study are as follows. First, the anger control program reduced the aggression according to the aggression test. It also reduced all aggressive behaviors such as physical, verbal, indirect aggression, denial, rage, and hostility. Second, it reduced aggressive behavior of the institutionalized children within a session such as physical, verbal, indirect aggression, denial, rage, and hostility. Although the study was a case study of a relatively small number of participants with limitations for a generalization, the results of the study showed that the anger control program had a positive effect on reducing the aggression of the children in an institution.
오영현 ( Young Hyun Oh ),김우생 ( Woosaeng Kim ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.1
최근 소비자가 컴퓨터는 물론 각종 전자기기를 구매하는데 있어 UI(User Interface) 및 UX(User eXperience)가 매우 중요한 요소로 자리 매김하고 있다. 터치스크린이나 각종 센서들이 탑재되고 있는 전자기기에서 볼 수 있듯이 HW의 눈부신 발전과 함께 더불어 UI의 다양성도 확대 되고 있다. 본 논문은 이러한 기대에 부응하기 위해 게임에서 많이 사용되는 물리엔진을 UI에 적용시켜 보았다. 여러 물리엔진들 중에 본 연구에 적합한 Box2D를 채택하여 UI에서 응용할 수 있는 10가지 모듈을 제시하였으며 활용할 수 있는 예도 제안하였다.