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셀룰로스 나노결정/키틴 나노섬유 혼합 분산액의 유변학적 거동 및 이방성 필름의 물리적 특성
김민형,이다래,김형섭 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.6
In this study, the effect of chitin nanofiber (ChNF) on the physical behaviors ofcellulose nanocrystal (CNC) in suspension and solid states was investigated using polarizedoptical microscopy, rotational rheometry, and wide-angle X-ray scattering system. ChNFshowed a significant effect on the cholesteric phase of CNC suspension, mainly owing tothe electrostatic attraction and hydrogen bonding between ChNF and CNC. In turn, theincrease of ChNF content reduced the size of the cholesteric domain. The applied shearforce on the suspension changed the cholesteric phase to a nematic structure that wasmaintained after the solidification. This improved the mechanical strength of the resultedfilm along the shear direction.
김민형,정동영,강윤식,이명재,신희종,김미주,박수빈,성영은 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Fuel cell has been regarded as one of the most attractive future energy conversion device due to its energy efficient and environmentally friendly properties. However, the price of fuel cell device is extremely high because the precious metal, such as platinum, has been used as essential part of fuel cell catalysts. Therefore, many researchers have investigated the synthesis of non-precious-metal catalysts (NPMCs) for replacing the platinum-based catalysts. In this study, we synthesized metal-nitrogen- carbon (M-N-C) NPMC by pyrolysing the mixture of metal, nitrogen and carbon precursors with various heat-treatment times and compared the oxygen-reduction-reaction (ORR) activity of each catalyst. From this, we wanted to verify the effect of pyrolysis-duration on catalyst synthesis process.
김민형 한국국방연구원 2019 The Korean Journal of Defense Analysis Vol.31 No.2
The main goal of this article is to explain the American failure of deterring North Korean nuclear proliferation. Specically, it examines the underlying reasons for which U.S. inhibition policy toward North Korea has failed, despite the numerous attempts by U.S. administrations (both Republicans and Democrats) to prevent North Korea’s nuclear development. The central thesis of the article is that while there were multiple reasons for the American failure of North Korean proliferation, the most important ones were U.S. misperceptions about both North Korea’s and China’s intentions and U.S. distraction by the war on terror. These factors, along with Pyongyang’s shrewd strategies to manipulate Washington, Seoul, and Beijing, played a key role in the emergence of a nuclear North Korea.
김민형,김기룡,곽승철 한국아동심리재활학회 2015 놀이치료연구 Vol.19 No.2
This study was to analyze the counselling program and study trends for children with special needs. Data were collected from 36 counselling studies since 2000. The selected studies were analyzed focusing on general study trend, contents and methods of counseling, and actions considering disability. The reliabilities were verified by 3 experts. Findings were as follows. First, in the general study trend, art counseling was the largest proportion of all types of counseling, and the study of mental retardation showed the most common type of all disability types. The study of elementary school was the largest proportion of all school courses. In research design, experimental research was implemented more than single subject research. Second, in the contents and methods of counseling, developing interpersonal relationship skill was treated mostly as the goal of counseling, and group counseling was more preferred than personal counseling. Under twenty sessions and sixty minutes were most chosen for proper counseling time. Third, in the actions considering disability, difficulty adjusting, causing interest, interaction promote as adjustments of contents, reducing session, moderator role time as those of practices, and placements, seat exchange, sound control as those of environments were adapted. It was suggested that finding of this study is basis data to develop counseling program for children with disabilities. 이 연구에서는 2000년 이후부터 수행된 장애아 대상 상담 연구 36편을 상담이론에 기반하여 일반적인 연구 동향, 상담내용과 상담방법 운영 현황, 장애아의 특성과 요구를 고려한 조치의 특성을 중심으로 장애아 상담 연구를 분석하고자 하였다. 일반적인 연구 동향을 분석한 결과, 상담유형 중 미술치료 상담이 가장 많았고, 장애유형은 정신지체가 가장 많았다. 학교과정은 초등학교 과정이 가장 많았고, 연구설계는 단일대상연구보다는 실험연구설계를 사용한 연구가 많았다. 상담내용과 상담방법 운영 현황을 분석한 결과, 대인관계 능력 신장을 상담목표로 선정한 연구가 가장 많았고, 상담형태는 집단상담이 개인상담보다 더 많았다. 상담회기는 20회기 미만, 상담시간은 60분 운영된 경우가 많았다. 장애아를 고려한 조치의 특성을 분석한 결과, 내용적인 측면에서는 난이도조절, 흥미유발, 상호작용 촉진, 표현활동 촉진, 단계조절을 고려하였고 실행 측면에서는 회기와 진행자 역할을 가장 많이 고려하였다. 환경 측면에서는 장소변경, 교실 내 환경수정, 진행자 고려를 조치한 것으로 나타났다. 연구결과를 바탕으로 장애아 상담 연구의 특성을 제시하고 후속 연구의 필요성을 제시하였다.