마이크로웨이브 플라즈마 화학기상증착법에 의한 탄소나노튜브의 성장특성

최성헌,이재형,Choi Sung-Hun,Lee Jae-Hyeoung 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.6

Carbon nanotubes (CNTs) were grown with a microwave plasma enhanced chemical vapor deposition (MPECVD) method, which has been regarded as one of the most promising candidates for the synthesis of CNTs due to the vertical alignment, the low temperature and the large area growth. MPECVD used methane ($CH_4$) and hydrogen ($H_2$) gas for the growth of CNTs. 10 nm thick Ni catalytic layer were deposited on the Ti coated Si substrate by RF magnetron sputtering method. In this work, the pretreatment was that the Ni catalytic layer in different microwave power (600, 700, and 800 W). After that, CNTs deposited on different pressures (8, 12, 16, and 24 Torr) and grown same microwave power (800 W). SEM (Scanning electron microscopy) images showed Ni catalytic layer diameter and density variations were dependent with their pretreatment conditions. Raman spectroscopy of CNTs shows that $I_D/I_G$ ratios and G-peak positions vary with pretreatment conditions.

마이크로 웨이브를 이용한 탄소나노튜브 성장시 바이어스 전압의 효과

최성헌(Sung-hun Choi),이재형(Jaehyeung Lee),양종석(Jong-Seok Yang),박대희(Da-Hee Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7

In this study, we synthesized CNTs(carbon nanotubes) on the glass substrate by microwave plasma enhanced chemical vapor deposition (MPECVD), Effect of bias voltage on the grown behavior and morphology of CNTs were investigated. Recently, it has been proposed that aligned CNTs can also be achieved by the application of electric bias to the substrate during growth, the first time reported the bias effect such that the nanotube alignment occurred only when a positive bias was applied to the substrate whereas no aligned growth occurred under a negative bias and no tube growth was observed without bias. On the country, several researchers reported some different observations that aligned nanotubes could also be grown under negative substrate biases. This discrepancy as for the effect of positive and negative bias may indicate that the bias effect is not fully understood yet. The glass and Si wafers were first deposited with TiN buffer layer by r.f sputtering method, and then Ni catalyst same method, The thickness of TiN and Ni layer were 200 ㎚ and 60 ㎚, respectively. The main process parameters include the substrate bias (0 to - 300 V), and deposition pressure (8 to 20 torr).

마이크로웨이브를 이용한 탄소나노뉴브의 성장시 플라즈마 압력의 효과

최성헌(Sung-Hun Choi),이재형(Jaehyeong Lee),양종석(Jong-Seok Yang),박대희(Dae-Hee Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10

Carbon nanotubes (CNTs) have recently attracted great attention because of their excellent physical properties, such as high mechanical strength, thermal stability, and electronic properties. These useful properties of carbon nanotubes make themselves good candidates for various application field, such as a transistor, battery, field emission display, nanoscale inter-connects, and so on. Gas-phase techniques offer the unique ability to synthesize well-oriented arrays of CNTs. However, it is seldom reported that the pressure influences on the growth of CNTs under low substrate temperature. In this work, the effect of the working pressure and the influence of the catalyst preparation on the properties of CNTs grown by microwave plasma chemical vapor deposition (MPCVD) were investigated.

셀룰로오스 디아세테이트/몬모릴로나이트 나노복합체의 제조 및 기계적 물성

조미숙(Mi Suk Cho),최성헌(Sung Hun Choi),남재도(Jae Do Nam),이영관(Young Kwan Lee) 한국고분자학회 2004 폴리머 Vol.28 No.6

마이크로웨이브 화학기상합성법을 이용한 압력에 따른 탄소나노튜브의 성장 효과

이재형(Jae-Hyeoung Lee),최성헌(Sung-Hun Choi),최원석(Won Seok Choi),김정태(Jungtae Kim),홍병유(Byungyou Hong) 대한전기학회 2005 대한전기학회 학술대회 논문집 Vol.2005 No.7

전라남도사회서비스원 종합재가센터 운영방안 연구

용태희(Yong, Tae-hee),최성헌(Choi, Sung-Hun) 한국지역사회복지학회 2021 한국지역사회복지학 Vol.- No.78

본 연구는 전라남도사회서비스원 개원을 앞둔 시점에서 종합재가센터의 초기 안착 및 안정적 운영을 위한 방안을 제시하는 것이 연구목적이다. 이를 위해 문헌조사, 사례조사, 심층인터뷰 등을 통해 전라남도 재가서비스 수급현황, 타 시도 종합재가센터 특성 및 운영상 당면 이슈, 전라남도사회서비스원 종합재가센터 운영방안을 제시하였다. 보건복지부(2020)의 사회서비스원 종합재가센터의 사업범위에 따른 장애인활동지원사업, 가사‧간병방문지원사업, 장기요양재가급여사업의 분석결과 장애인활동지원사업 기관당 잠재 이용자 수는 무안군, 고흥군, 목포시 순으로 많게 나타났다. 가사‧간병방문지원사업 기관당 잠재 이용자 수는 순천시, 여수시, 목포시 순으로 많게 나타났다. 방문요양 서비스 기관당 잠재 이용자 수는 구례군, 여수시, 목포시 순으로 많게 나타났다. 타 시도 사회서비스원 종합재가센터 담당자 심층인터뷰 결과 운영체계 구축, 운영상의 어려움, 내‧외부 자원체계와 협업방법, 공공성을 위한 노력 4가지의 상위 범주(개념)가 도출되었다. 이와 같은 연구결과를 바탕으로 지역사회통합돌봄 선도사업을 수행 중인 지자체 또는 복지접근성이 떨어지는 농산어촌 및 도서지역 지자체에 종합재가센터 우선 설치를 제안한다. 또한 초기에는 민간과의 경쟁 구도보다는 돌봄서비스 사각지대에 보전적인 개념으로 접근하고, 거점지역에 시범사업 형태로 설치ㆍ운영 후 성과 및 효과성을 파악하기 위해 노력이 요구된다. The purpose of this study is to present measures for the initial settlement and stable operation of the Comprehensive Welfare Center at Home ahead of the opening of the Jeonnam public agency Social Service. For this study, management methods were presented, such as the current status of supply and demand for home services in Jeollanam-do, characteristics of centers in other cities and provinces, and current issues in operation through literature research, case studies, and in-depth interviews. According to an analysis of the scope of the Ministry of Health and Welfare"s comprehensive social service center (2020), the number of potential users of Personal Assistance Services for People with Disabilities, household and nursing services, and long-term care services for the elderly were as follows. It is shown in the order of Muan-gun, Goheung-gun, and Mokpo City. The number of potential users per household and nursing services was shown in the order of Suncheon City, Yeosu City, and Mokpo City. The number of potential users per visiting long-term care services for the elderly was shown in the order of Gurye-gun, Yeosu City and Mokpo City. As a result of in-depth interviews with people in public agency for Social service to Comprehensive Welfare Center at Home in other cities and provinces, four concepts were derived: establishment of an operating system, difficulties in operation, methods of collaboration with internal and external resource systems, and efforts for publicness. Based on these research results, it is proposed to first install the Comprehensive Welfare Center at Home in local governments performing community care services or in rural and island local governments with poor access to welfare. In addition, it should initially support blind spots rather than competition with the private sector. Efforts are required to identify performance and effectiveness after installation and operation in some areas in the form of pilot projects.

전력케이블용 XLPE절연체/ 나노 반도전층 재료의 열적 특성

양종석(Jong-Seok Yang),최성헌(Sung-hun Choi),박장현(Jabg-Hyeon Park),성백룡(Baek-Ryong Sung),이재형(Jaehyeung Lee),박대희(Dae-Hee Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10

To improve the mean-life and the reliability of power cable, we have investigated specific heat (Cp). Specific-heat measurement temperature ranges of XLPE insulator were from 20[℃] to 90[℃], and the heating rate was 1[℃/min]. In case of semiconducting materials, the measurement temperature ranges of specific heat were from 20[℃] to 60[℃], and the heating rate was 1[℃/min]. From these experimental results, both specific heat were increased by heating rate because volume of materials was expanded according to rise in temperature. We could know that a small amount of CNT has a excellent thermal properties.

노인돌봄서비스 이용 노인의 돌봄 욕구와 안녕감에 관한 연구 : 사회적가치지향성의 효과를 중심으로

김가원(Ka-Won Kim),최성헌(Sung-hun Choi) 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.4

본 연구는 기존 노인돌봄서비스의 사회적가치지향성과 서비스 이용 노인의 안녕감을 평가하고, 돌봄 욕구에 대한 수요를 확인하여 우리나라 노인돌봄 정책의 발전 방향을 모색하고자 실시되었다. 2019년 10월 기준 3개월 이상 노인돌봄기본서비스를 이용한 노인 1,501명을 편의표집하였으며, 빈도분석 및 기술통계분석, t-검정, 분산분석 등을 실시하였다. 분석 결과 돌봄 서비스의 사회적가치지향성은 평균 90.93점이며, 돌봄 서비스 이용 노인의 안녕감은 71.29점으로 나타났다. 분산분석 및 사후분석 결과 사회적가치지향성을 보다 높다고 인식한 집단에서 노인들의 안녕감이 통계적으로 유의미하게 높았다. 한편 돌봄 서비스 중단 시 우려되는 점에 대해 “외로움”, “고독사”, “안전” 등의 키워드가 도출되었으며, 향후 필요한 서비스로 ‘일상생활 지원 서비스’에 대한 욕구가 가장 높았다. 본 연구결과를 토대로 노인돌봄서비스의 발전 방향 모색 및 노인돌봄 체계 구축에 기초자료로 활용될 수 있을 것이다. This study evaluates the social value orientation, well-being of the elderly and care needs of elderly that elderly care services are identified and seeks future service development directions through a desire survey. As of October 2019, 1,501 elderly living alone who used basic care services for the single elderly households for more than 3 months were sampled, and frequency analysis, technical statistical analysis, t-test, and variance analysis were conducted. The survey found that social value orientation averages 90.93, and the sense of well-being of the elderly is 71.29 points. As a result of the analysis of variance and post-hoc analysis, the well-being of the elderly was statistically significant in groups well aware of their social value orientation. In addition, key words such as “loneliness”, “lonely Death”, and “safety” were derived for concerns that may arise when the service is discontinued. Based on the results of this study, it could be used as basic data to explore the development direction of the new elderly care services” and to establish a care system for senior citizens in preparation.

다문화청소년의 무단결석 예측요인에 관한 연구

김희찬 ( Kim Hee-chan ),최성헌 ( Choi Sung-hun ) 한국청소년학회 2023 청소년학연구 Vol.30 No.2

이 연구는 무단결석이 청소년 비행 행동과 학업 중도 탈락의 배경적 역할을 할 수 있다는 점에 기반하여 다문화청소년의 무단결석 경험 추이를 파악해 보고 예측요인을 탐색해 보고자 했다. 이를 위해 다문화청소년패널 데이터를 활용하여 무단결석 추이와 무단결석에 미치는 영향요인을 파악했다. 분석결과 다문화청소년 무단결석 경험은 대체로 시계열적 증가 추이를 보였다. 학급별로 살펴보면 고등학교 시기의 무단결석 경험 비중이 중학교 시기보다 더 큰 것으로 나타났다. 또한, 무단결석 영향요인을 파악한 결과 우울, 무단결석을 경험한 주변 친구 및 선후배, 학교만족도, 국가정체성이 유의한 영향을 미치는 변수라는 점을 확인했다. 우울할수록, 무단결석을 경험한 주변 또래가 없는 경우에 비해 있으면, 학교만족도가 낮을수록, 국가정체성이 낮을수록 무단결석을 경험할 가능성이 커졌다. 이러한 결과를 기반으로 무단결석자에 대한 심리·정서적 지원과 학교생활만족도 향상 그리고 국가정체성 정립을 위한 지원의 필요성을 강조했다. Based on the fact in which the truancy could be working as background of delinquent behaviors and drop-out of adolescents, this study aimed to understand the trend of experiencing truancy of multicultural adolescents, and then to explore the factors affecting it. For this, this study performed the binomial logistic regression analysis using the data of the Multicultural Adolescents Panel in 2019. In the results of the analysis, the experience in truancy of multicultural adolescents mostly showed the trend of time-sequential increase. Examining it in each school level, the percentage of experiencing truancy was more highly sown in high school period than middle school period. As a result of identifying the factors influencing truancy, it was confirmed that depression, friends and seniors and juniors who experienced truancy, school satisfaction, and national identity were variables that had a significant effect. The more depressed, when there are peers who experienced truancy, the lower the school satisfaction, and the lower the national identity, the higher the possibility of experiencing truancy. Based on these results, the need for psycho-emotional support for truants, improvement in school life satisfaction, and support for establishing national identity was emphasized.

수질자동측정기기 측정값의 성능기준 개선 연구

서원학 ( Won Hak Seo ),송기봉 ( Ki Bong Song ),최종우 ( Jong Woo Choi ),유은진 ( Eun Jin Yoo ),최성헌 ( Sung Hun Choe ),박재구 ( Jae Koo Park ),이영준 ( Young Joon Lee ) 한국환경분석학회 2007 환경분석과 독성보건 Vol.10 No.3