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김철환,채원탁 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.14 No.5
beam of composite structure composed of the RC structure in the end part and steel structure in thecentral part were investigated during cyclic loading, in order to evaluate strength, stifness, and deformational capacity. The parameters used in this study include the amount of reinforced steel bar between the steel beam and RC structure and the existence of the sticking plate. Test results showed that all specimens had stabilized hysteresis loops. Likewise, the specimens with sticking plate had higher load-carrying capacity compared with the one without it. In addition, the stifness of the composite structure was higher than the steel structure. All specimens also showed good rotational capacity. 본 연구에서는 단부 철근콘트리트구조와 중앙부 철골구조로 이루어진 복합구조 보를 대상으로 내력 및 강성 , 변형능력을 평가하기 위해 반복재하 실험을 행하였다 . 주된 실험변수는 철근콘크리트와 철골보의 이종구조 이음부부의 응력전달을 위해 철골보에 접합되는 철근의 개수와 단부 콘크리트를 구속하여 강성을 상승시킬 목적으로 설치되는 부착판의 설치유무이다 . 실험결과 모든 실험체가 방추형의 이력 거동을 나타내며 안정된 거동을 하였으며 , 내력에 있어서는 부착판 설치 실험체의 경우가 기본형 실험체 보다 높게 나타났다 . 또한, 강성에 있어서도 단부에 부착판을 설치한 실험체가 설치하지 않은 실험체에 비하여 보다 높게 나타났으며 , 모든 실험체가 최대 내력시의 부재각이 0.03rad..
실현화 이론의 주요 원칙과 국제화 성과에 영향을 미치는 역량 간의 관계 연구
김철환,박증남 한국통상정보학회 2024 통상정보연구 Vol.26 No.1
Recently, securing the capabilities of small and medium-sized enterprises has been recognized as an important study. Much research has been done on the importance of international entrepreneurial orientation and network capabilities to achieve internationalization results, but little research has been done on the impact of effectuation. This study aims to analyze the impact of effectuation on internationalization performance by matching the main principles of effectuation with international entrepreneurial orientation, network capabilities, and previously undefined improvisational response capabilities. For this survey, an online survey was conducted from December 11, 2023 to January 15, 2024, after calling companies included in the 2022 list of exporters and importers to check whether they could respond. SPSS 26.0 and Amos 26.0 programs were used for statistical processing for empirical analysis. The results of the study showed that, in addition to the use of ownership means, the effectuation principles are related to capabilities that affect internationalization performance. When it comes to internationalization performance, network capabilities show that strength is more important than size, and improvisation response capabilities show that speed is more important than flexibility. The reason why the risk sensitivity hypothesis was rejected is that it was a difficult time to take risks and internationalize during the COVID-19 crisis.
김철환,박배훈,정창현 ( C . H . Kim,B . H . Park,C . H . Jung ) 한국수학교육학회 1988 수학교육 Vol.26 No.2
Mathematics education is generally to cultivate mathematical thought. Most meaningful thought is to solve a certain given situation, that is, a problem. The aim of mathematics education could be identified with the cultivation of mathematical problem-salving ability. To cultivate mathematical problem-solving ability, it is necessary to study the nature of mathematical ability and its aspects pertaining to problem-solving ability. The purpose of this study is to investigate the relation between problem-solving ability and classificational viewpoint of mathematical verbal problems, and between the detailed abilities of problem-solving procedure and classificational viewpoint of mathematical verbal problems. With the intention of doing this work, two tests were given to the third-year students of middle school, one is problem-solving test and the other classificational viewpoint test. The results of these two tests are following. 1. The detailed abilities of problem-solving procedure are correlated with each other : such as ability of understanding, execution and looking-back. 2. From the viewpoint of structure and context, students classified mathematical verbal problems. 3. The students who are proficient at problem-solving, understanding, execution, and looking-back have a tendency to classify mathematical verbal problems from a structural viewpoint, while the students who are not proficient at the above four abilities have a tendency to classify mathematical verbal problems from a contextual viewpoint. As the above results, following conclusions can be made. 1. The students have recognized at least two fundamental dimensions of structure and context when they classified mathematical verbal problems. 2. The abilities of understanding, execution, and looking-back effect problem-solving ability correlating with each other. 3. The instruction emphasizing the importance of the structure of mathematical problems could be one of the methods cultivating student`s problem-solving ability.
김철환,Kim, Cheol-Hwan 한국방위산업진흥회 2000 國防과 技術 Vol.- No.251
북한의 대량파괴무기 개발은 미국과 일본으로 하여금 TMD 계획을 추진하게 함으로써 미-중, 일-중 및 미-러간의 대결을 조장하여 동아시아지역의 안정을 해치고 있다. 특히 일본은 2002년경까지 감시위성 4기 발사 및 미국과 TMD체계 공동연구계획을 발표함으로써 동북아에서 군비경쟁이 실감나게 재현되고 있는 것이다. 일본의 TMD 체계 및 첩보위성 무장과 자위대 역할 확대가 현실화되면 동북아지역에서 새로운 첨단 군비경쟁을 촉발할 가능성은 얼마든지 있다.