이종 계면저항 저감 구조를 적용한 그래핀 양자점 기반의 고체 전해질 특성

황성원,Hwang, Sung Won 한국반도체디스플레이기술학회 2022 반도체디스플레이기술학회지 Vol.21 No.3

The stabilized all-solid-state battery structure indicate a fundamental alternative to the development of next-generation energy storage devices. Existing liquid electrolyte structures severely limit battery stability, creating safety concerns due to the growth of Li dendrites during rapid charge/discharge cycles. In this study, a low-dimensional graphene quantum dot layer structure was applied to demonstrate stable operating characteristics based on Li+ ion conductivity and excellent electrochemical performance. Transmission electron microscopy analysis was performed to elucidate the microstructure at the interface. The low-dimensional structure of GQD-based solid electrolytes has provided an important strategy for stable scalable solid-state lithium battery applications at room temperature. This study indicates that the low-dimensional carbon structure of Li-GQDs can be an effective approach for the stabilization of solid-state Li matrix architectures.

청소년을 위한 '이동과학교실' 사례연구를 통한 재미있는 과학의 특성 연구

황성원,최정훈,황북기,Hwang, Sung-Won,Choi, Jung-Hoon,Hwang, Book-Hee 한국초등과학교육학회 2005 초등과학교육 Vol.24 No.5

The 'Mobile Science Lab' is a public program designed to bring teenagers to be engaged in the activities of science and technology. In this study, we attended to elementary school students' participating actions in the program and intended to understand their enjoyment of science from sociocultural and practical perspectives. By drawing on case materials culled from our database, we articulated the features of the enjoyable science activities in the form of two major claims. First, students had rich opportunities to communicate emotionality, which therefore grounds emerging actions on the positive emotional valence. Second, ongoing actions opened up new action possibilities not only to the actors themselves, but also to other community members. The results of this study constitute theoretical frameworks for understanding enjoyment without dichotomizing emotion and cognition, and thereby contribute to designing enjoyable activities of learning science.

PVP GQD / HfOx 구조를 갖는 전도성 필라멘트 기반의 저항성 스위칭 소자 특성

황성원,Hwang, Sung Won 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.1

A composite active layer was designed based on graphene quantum dots, which is a low-dimensional structure, and a heterogeneous active layer of graphene quantum dots was applied to the interfacial defect structure to overcome the limitations. Increasing to 1.5~3.5 wt % PVP GQD, Vf changed from 2.16 ~ 2.72 V. When negative deflection is applied to the lower electrode, electrons travel through the HfOx/ITO interface. The Al + ions are reduced and the device dominates at low resistance. In addition, as the PVP GQD concentration increased, the depth of the interfacial defect decreased, and the repetition of appropriate electrical properties was confirmed through Al and HfOx/ITO. The low interfacial defects help electrophoresis of Al+ ions to the PVP GQD layer and the HfOx thin film. A local electric field increase occurred, resulting in the breakage of the conductive filament in the defect.

InGaN/GaN Micro-LED구조를 위한 그래핀 양자점 기반의 산화막 기판 특성

황성원,Hwang, Sung Won 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.3

The core-shell InGaN/GaN Multi Quantum Well-Nanowires (MQW-NWs) that were selectively grown on oxide templates with perfectly circular hole patterns were highly crystalline and were shaped as high-aspect-ratio pyramids with semi-polar facets, indicating hexagonal symmetry. The formation of the InGaN active layer was characterized at its various locations for two types of the substrates, one containing defect-free MQW-NWs with GQDs and the other containing MQW-NWs with defects by using HRTEM. The TEM of the defect-free NW showed a typical diode behavior, much larger than that of the NW with defects, resulting in stronger EL from the former device, which holds promise for the realization of high-performance nonpolar core-shell InGaN/GaN MQW-NW substrates. These results suggest that well-defined nonpolar InGaN/GaN MQW-NWs can be utilized for the realization of high-performance LEDs.

언어,교육 : 프랑스 시민대학, "대학 밖 대학" 특성과 운영

황성원 ( Sung Won Hwang ) 경희대학교 비교문화연구소 2011 비교문화연구 Vol.25 No.-

Civil college is a public educational institute for theoretical and practical learning. This study examines the social context behind France`s civil college and how it is being operated. Many studies have been conducted in Korea to examine Germany in terms of lifelong learning or adult learning, but there is almost no study on France. Therefore, this study was conducted to analyze the history and operation of civil college, the "college outside college," in France and what Korea should learn from it. · The civil college of France can be discussed in two contexts: first, it is AUPF, which stands for the French association of civil colleges, and it was mostly influenced by Northern Europe and Germany. Second, it is Caen Civil College, which was established by M. Onfray based his philosophical collaboration. The European civil college opened almost 1,000 courses in 2010-2011 for a variety of subjects, including Foreign Languages, Mother Tongue, the Dialects of Alsace, Philosophy, Cosmology, History, Art History, Psychology, Sociology, Astronomy, Botany, and Natural Science. Courses in Fine Arts include drawing, painting, sculpture, photography, music, and theater. For another form of civil college, Philosopher M. Onfray has been operating Caen Civil College since 2002 for general education and cultural education. It is not acknowledged by conventional philosophers, but it is contributing to the popularization of philosophy. In conclusion, the civil college in France has brought in-depth philosophical discussions out of the lecture rooms in an effort to popularize learning, making lifelong learning more accessible to the general public.

프랑스 교육의 특성에 따른 교사교육의 변화

황성원(Hwang Sung-Won),사영숙(Sa Young-Sook) 한국비교교육학회 2006 比較敎育硏究 Vol.16 No.4

  프랑스는 1789년 프랑스 혁명이념에 대중 교육의 필요성을 포함하여 공교육을 일찍부터 시도하였으나 왕정과 공화정을 번복하는 사이에 공교육 제도는 100년이 지난 1882년에 성립되었다. 공교육 체제를 법제화하면서 교원 양성 기관도 설립하여 오늘날까지 이어져 오고 있었으나 교육정책에 따라 교원양성 체제는 조금씩 변화 및 발전하여왔다.<BR>  이 연구에서는 이러한 프랑스 학교교육의 특성을 바탕으로 초등학교와 중등학교 교사들이 어떠한 과정으로 양성되어 오고 있으며, 오늘날에 논의되고 있는 교원 양성 체제의 개혁은 무엇인지 살펴보고자 한다.<BR>  교육의 질을 결정하는 교사들이 어떻게 교직을 지원하고, 어떠한 과정으로 양성되고 있으며, 어떠한 자격시험을 통해 선발되는지에 대한 지식과 정보는 우리나라 교원 양성 체제의 향후 개편 방향에 매우 의미 있는 시사점을 제공해 줄 수 있다.   France started public education from the early in the history for the ideology of the French Revolution in 1798 included the necessity of public education. However, the system of public education was established in 1882, 100 years later, because the imperial regime and the republican governments repeated. As the system of public education became legislated, the institution to cultivate teachers was established and has continued to be in service until these days. The teacher cultivating system has been gradually changed and developed according to the education policies.<BR>  In this study, it is attempted to investigate through what courses primary and secondary school teachers are cultivated and what renovation is discussed these days for the teacher cultivating system in France education.<BR>  The knowledge and information about how teachers, who determines the quality of education, apply for teaching positions, what courses they are cultivated through, and what kinds of qualification exams they are selected by will provide significant information to be referenced for the improvement of teacher cultivating system in our country.

노인의 일상생활장애 정도에 따른 고령친화제품 분류 특성 연구

황성원 ( Hwang Sungwon ),모정현 ( Mo Jeong Hyun ),이윤희 ( Lee Yunhee ) 한국디자인트렌드학회 2011 한국디자인포럼 Vol.33 No.-

고령사회 진입을 앞두고 노년기의 생활의 질에 대한 관심이 점차 증가함에 따라 고령친화산업은 매우 확장 가능성이 큰 분야로 전망되고 있다. 그러나 고령친화제품은 제품별 기능과 성능 위주로 공급되어 정확한 사용방법과 가이드라인이 마련되어 있지 않다. 따라서 본 연구는 고령친화제품의 제품 분류 기준을 사용자의 일상생활장애 정도, 생활공간별 분류 기준틀을 제안한다. 이는 노화로 인한 일상생활수행능력이 떨어지는 노인들의 장애 정도에 따른 올바른 제품선택을 돕는 기준이 되고 고령친화제품체험관 전시체험 프로그램에 반영하여 좀 더 효율적인 정보전달이 가능하도록 한다. 이러한 연구결과는 생활공간별, 장애등급별 제품 개발의 필요성을 파악해 고령친화산업 발전방향 제시에 기초 자료로 활용될 것이다. In Korea, welfare needs brought on by the rapidly growing of elderly population. Also, the senior group with spare time, wealth and health is increasing. Currently, the people have known about needs welfare system for improving quality of life during senescence personally and socially. In addition to the senior friendly industry, having distinction with simple approach medical services, will be great expanding after 2010. And there will be a new welfare services plan supporting long term care insurance for senior citizens. But we don`t have prepared systematically organized senior friendly industry and products yet. So, the purpose of the study is to analyze systematically the classification characteristics of the senior friendly products according to the difficulty of daily living for senior citizens. Above all, the study finds out the senior friendly products characteristics according to the consumer`s various situations about health and housing space. Therefore the result of the study reveals that the simulation guidelines for choosing the products depend on the customer`s needs are essential and useful to improve senior friendly industry. And the post evaluation data of senior friendly products would be put to practical use in the industry.

CFD를 이용한 핀의 열 사이에 간극을 가지는 Offset Strip Fin의 성능 해석

황성원(Seongwon Hwang),정지환(Ji Hwan Jeong) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.8

The off-set strip fins (OSF) have been widely used to construct plate-fin heat exchangers. Conventional OSF is constructed in successive rows of fins. New OSF structure is suggested to have a gap between adjacent rows of fins. The gap is intended to reduce fouling by allowing small objects to flow through fins. The objective of this work is to investigate the performance of off-set strip fins with gap between successive rows. Results showed that the performance of OSF with gap can’t be predicted by previous correlation.

강화학습과 시각 어텐션에 따른 군중 시뮬레이션 구현

황성원(Sungwon Hwang),강형엽(Hyeongyeop Kang) Korean Institute of Information Scientists and Eng 2023 한국정보과학회 학술발표논문집 Vol.2023 No.12

전기와 자기에 대한 중학생들의 개방적 탐구에서 과제 유형에 따른 탐구 수행 분석

황성원(Sung Won Hwang),박승재(Sung Jae Pak) 한국과학교육학회 2001 한국과학교육학회지 Vol.21 No.2

The purpose of this study is to analyse the eighth grade students` performance of open investigations for two kinds of tasks: the qualitative one which involves the descriptive approach through observation, and the quantitative one which involves the quantitative data processing through control of variables. Researcher`s observation, interview data as well as students` investigation reports, self-evaluations were analysed. The difficulties of qualitative open investigation lie in detecting and dealing with unexpected observations, of which the acceptance and interpretation were influenced by preconceptions. On the other hand, managing several variables, making reliable and valid measures, and quantitative data processing constituted main difficulties of quantitative open investigation. Some students could recognize the deficiencies of their methods and findings in qualitative one, but few in quantitative one. These results suggest the teaching point for each task of open investigations.