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정중현,김명욱,박승철,김근묵,엄영호,노삼규 연세대학교 자연과학연구소 1982 學術論文集 Vol.9 No.-
처음으로 반절연성 InP:Fe를 SSD법으로 생장시키었다. Fe를 각각 0.5와 1.0 wt-% 첨가한 결정의 비저항은 실온에서 각각 3.1×10^7와 1.5×10^7Ω·cm이었으며, 저항의 온도 위존성에서 얻은 Fe의 에너지 준위는 전도대의 바닥 아래로 0.66 eV이었다. For the first time we obtained the semi-insulating InP:Fe crystals grown by SSD method. Their resistivities were 3.1×10^7 and 1.5×10^7Ω·cm in the Fe-doped crystals with contents of 0.5 and 1.0 wt-%, respectively. Temperature dependence of the crystal revealed the energy level of Fe as 0.66 eV from the bottom of the conduction band.
청소년의 스마트폰 과의존 예방교육 경험에 대한 사례 연구
정중현,이미나 사단법인 한국융합기술연구학회 2024 아시아태평양융합연구교류논문지 Vol.10 No.3
본 연구는 청소년의 스마트폰 과의존 예방교육 경험에 대한 사례 연구이다. 청소년들은 스마트폰을 통해 관계형성, 학습, 놀이 등 다양한 활동을 한다. 본 연구는 2023년 5월 20일부터 2023년 8월 6일까지 2주에 1회씩 진행하였다. G지역에 거주하는 총 4명의 중고등학생(만13~18세)을 대항으로 총 6회기로로 구성되었다. 질문지의 내용은 심층인터뷰 질문 내용은 다음과 같다. 스마트폰 이용 시간 등의 기본 문항 외에는 신체적인 문제, 불안과 초조 경험, 타인의 스마트폰 사용 경험에 대한 인식, 관계적 욕구, 자기표현의 욕구, 외로움이나 심심함, 부정적인 감정 처리가 힘듦, 여가 활용 방법, 의사소통의 문제 등의 10문항이다. 스마트폰 예방교육 실시에 앞서 학생들 스스로가 스마트폰 과다 사용에 대해 인식하고, 학교에서는 스마트폰 사용에 관한 체계적인 교육을 실시하며, 올바른 스마트폰 사용에 대한 모듈을 개발하여 보급하는 노력이 필요하다. 스마트폰 과의존에 따른 청소년의 정신건강 문제와 이를 개선하기 위한 해결 방안을 제시하고 올바른 스마트폰 활용을 위한 예방교육프로그램을 제안하는데 기초연구를 제공하고자 한다. This study explores the experience of adolescent smartphone overdependence prevention education. Adolescents use smartphones to engage in various activities such as building relationships, learning, and playing. This study was conducted once every two weeks from May 20, 2023 to August 6, 2023. It involved four middle and high school students (ages 13 to 18) who lived in area G throughout the course of six sessions. The contents of the questionnaire and the in-depth interview questions are as follows: time spent using smartphones, physical problems, experiences of anxiety and nervousness, awareness of others' smartphone use experiences, relational needs, needs for self-expression, loneliness or boredom, difficulty processing negative emotions, and ways to use leisure time. There are 10 questions about communication problems, etc. Prior to implementing smartphone prevention education, efforts are needed to make students themselves aware of excessive use of smartphones, provide systematic education on smartphone use in schools, and develop and distribute modules on proper smartphone use. This study aims to provide basic research on youth mental health problems caused by overdependence on smartphones, suggest solutions to improve them, and propose preventive education programs for proper use of smartphones.
정중현,김진수,최병춘,문병기,전병억,조상복 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.3
Bismuth lanthanum titanate (Bi3.25La0.75Ti3O12, BLT) and W-doped bismuth lanthanum titanate (Bi3:25La0:75Ti2.95W0.05O12, BLTW) were prepared by using a solid state reaction method. The dielectric and the impedance relaxation were investigated by using dielectric and impedance spectroscopy. W doping on BLT decreased the low-frequency dielectric dispersions and electrical conductivity. Complex impedance plot of the BLT exhibits two impedance semicircular arc, while that of the BLTW ceramics exhibited one semicircular arc, which is related to the bulk properties of the grains. The low-frequency dielectric dispersion and the impedance relaxation for BLT and BLTW are explained by introducting an equivalent circuit.
정중현,김진수,최병춘,노영우,정수태,조상복 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.3
Bi4Ti3O12 (BIT), (Bi3.2Nd0.8)Ti3O12 (BNT), (Bi3.2Nd0.8)(Ti2.95Nb0.05)O12 (BNTN) and (Bi3.2 Nd0.8)(Ti2.95V0.05)O12 (BNTV) ceramics were prepared by using a solid state reaction method. The effects of Nd/Nb and Nd/V co-doping on the dielectric, ferroelectric and electrical properties were studied. Nd/Nb and Nd/V co-doping decreased the low-frequency dielectric dispersion and the electrical conductivity. The BNTN and the BNTV ceramics exhibited saturated P-E hysteresis loops and the corresponding remanent polarization increased. The Nd/Nb and Nd/V co-doping of BIT decreased its conductivity and improved its ferroelectric properties.
정중현,이종규 한국어업기술학회 1997 수산해양기술연구 Vol.33 No.3
The analytical solutions of the Fraunhofer Diffraction(FD) theory and the principle for measurement of the dispersion relation of plasma wave is presented. Especially, the method for measurement of low-frequency wave is discussed. The wavenumbers of the density fluctuations are obtained from the curve fitting between the expremental FD profile and theoretical one for each frequency component. In measurement of the wavenumber of the low -frequency region, the information of the wavenumber is easily obtained from the ratio of the intensity at = 0 to the intensity at =0.5. The millimeter wave FD apparatus was designed to measure low-frequency density fluctuations. The determined wavenumbers are in the range of =0.1~ 1.0cm. Thus, the millimeter wave FD method was shown to be useful for the measurement of low-frequency density fluctuations, which are impossible to be measured by using a convention. Thomson scattering. The obtained dispersion relations will be useful information for plasma waves.