염소 처리된 저밀도 폴리에틸렌 필름의 산화 및 기계적 완화 특성

황명환,박동화,박구범 한국산업안전학회 1991 한국안전학회지 Vol.6 No.3

이 논문은 폴리에틸렌 필름을 염소처리해서 부분방전에 대한 내산화특성 및 염소처리필름과 γ선조사 필름의 분자운동에 대해 조사한 것이다. 1. 염소 처리한 PE 필름의 표면을 연마해서 C-Cl 이 10㎛ 깊이까지 분포하고 있음을 알았다. 2. 염소화가 진전하면 결정화도가 감소하며 가교가 발생한다. 3. 염소화 PE는 부분 방전에 의해 생기는 오존의 산화를 억제하고, 자신은 결합했던 염소를 잃는다. 4. 염소처리를 행하면 PE의 CH2 주쇄의 운동인 γ 흡수가 염소치환에 의해 감소한다. This paper is for the properties of the oxidation-proof of the partially discharged and of the molecular motion on chlorinated PE Film. this paper also shows the properties of the molecular motion of the γ ray irradiated PE Film. 1. In the surface of the PE Film enforce chlorination, C-Cl be distributed up to 10 ㎛ deep. 2. In according to the development of the chlorination, the measure of crystalization decreased and cross link occured 3. Chlorination PE Film control the oxidation on ozone to occuration by partial discharge and it lost bonding chlorine. 4. In according to chlorination, γ absorption in motion of CH2 main chain of PE decreased by chlorine stbstitution.

그릿의 요인구조 분석 및 목표 구체화를 통한 그릿의 효과: 고등학교 영어학업성취도를 중심으로

황명환,이희경 팬코리아영어교육학회 2018 영어교육연구 Vol.30 No.3

This study aims to investigate the most appropriate grit factor structure for Korean high schoolstudents and to see the impact of goal-specific grit (English grit) on English achievementcompared to that of general grit. The data were obtained from a total of 488 Korean high schoolstudents by using the Grit-S(Grit-Short) and an adapted Grit-S for English grit. ConfirmatoryFactor Analysis and Structural Equation Modeling were applied to analyze the data. The resultssuggested that two-correlated factor structure of grit outperformed its rival models such as onefactorand bi-factor models. In addition, the sub-constructs comprising goal-specific English gritwere found to be more influential predictors than those of general grit in predicting Korean highschool students’ English achievement. The results were consistent with the outcomes from priorstudies. Lastly, pedagogical implications were further proposed. This study aims to investigate themost appropriate grit factor structure for Korean high school students and to see the impact of goal-specific grit(English grit) on English achievement compared to that of general grit. The data were obtained from a total of 488 Korean high school students by using the Grit-S(Grit-Short) and an adapted Grit-S for English grit. Confirmatory Factor Analysis and Structural Equation Modeling were applied to analyze the data. The results suggested that two-correlated factor structure of grit outperformed its rival models such as one-factor and bi-factor models. In addition, the sub-constructs comprising goal-specific English grit were found to be more influential predictors than those of general grit in predicting Korean high school students’English achievement. The results were consistent with the outcomes from prior studies. Lastly, pedagogical implications were further proposed.

유기박막트랜지스터 응용을 위해 플라즈마 중합된 Styrene 게이트 절연박막

황명환,손영도,우인성,바산바트호약,임재성,신백균,Hwang, M.H.,Son, Y.D.,Woo, I.S.,Basana, B.,Lim, J.S.,Shin, P.K. 한국진공학회 2011 Applied Science and Convergence Technology Vol.20 No.5

ITO가 코팅된 유리 기판 위에 플라즈마 중합법으로 styrene 고분자 박막을 제작하고 상부 전극을 진공 열증착법으로 제작된 Au 박막으로 한 MIM (metal-insulator-metal) 소자를 제작하였다. 또한, 플라즈마 중합된 styrene 고분자 박막을 유기 절연박막으로 하고 진공열증착법으로 pentacene 유기반도체 박막을 제작하여 유기 MIS (metal-insulator-semiconductor) 소자를 제작하였다. 플라즈마 중합법으로 제작된 styrene (ppS; plasma polymerized styrene) 고분자 박막은 styrene 단량체(모노머) 고유의 특성을 유지하면서 고분자 박막을 형성함을 확인하였으며, 통상적인 중합법으로 제작된 고분자 박막 대비 k=3.7의 높은 유전상수 값을 보였다. MIM 및 MIS 소자의 I-V 및 C-V 측정을 통하여 ppS 고분자 박막은 전계강도 $1MVcm^{-1}$에서 전류밀도 $1{\times}10^{-8}Acm^{-2}$ 수준의 낮은 누설전류를 보이고 히스테리시스가 거의 없는 우수한 절연체 박막임이 판명되었다. 결과적으로 유기박막 트랜지스터 및 유기 메모리 등 플렉서블 유기전자소자용 절연체 박막으로의 응용이 기대된다. Plasma polymerized styrene (ppS) thin films were prepared on ITO coated glass substrates for a MIM (metal-insulator-metal) structure with thermally evaporated Au thin film as metal contact. Also the ppS thin films were applied as organic insulator to a MIS (metal-insulatorsemiconductor) device with thermally evaporated pentacene thin film as organic semiconductor layer. After the I-V and C-V measurements with MIM and MIS structures, the ppS revealed relatively higher dielectric constant of k=3.7 than those of the conventional poly styrene and very low leakage current density of $1{\times}10^{-8}Acm^{-2}$ at electric field strength of $1MVcm^{-1}$. The MIS structure with the ppS dielectric layer showed negligible hysteresis in C-V characteristics. It would be therefore expected that the proposed ppS could be applied as a promising dielectric/insulator to organic thin film transistors, organic memory devices, and flexible organic electronic devices.

IPA와 어휘네트워크 분석을 활용한 한국어교육실습 수업 만족도 분석 연구- 비대면 모의실습을 중심으로 -

황명환,민진영 연세대학교 언어정보연구원 2024 언어사실과 관점 Vol.61 No.-

This study aimed to examine the factors of improvement, satisfaction, and dissatisfaction in non-face-to-face Korean language teaching practicums, particularly micro-teaching sessions, for prospective Korean language teachers under the Academic Credit Bank System. and ultimately to suggest pedagogical strategies to enhance the satisfaction levels of future non-face-to-face micro-teaching programs in Korean language education. To fulfill these objectives, data were gathered from 132 trainees via self-report surveys, and subsequently analyzed using Importance-Performance Analysis (IPA) and lexical network analysis methods. The summarized outcomes of the analysis are as follows. Firstly, the IPA highlighted key areas for improvement, which included enhancing the experience of 'auxiliary material development', providing more in-depth 'feedback on technical skills', and fostering a deeper comprehension of the 'educational field'. Secondly, the primary factors contributing to satisfaction were identified in several areas, encompassing the class methodology, the learner factors, and the class content. Thirdly, the principal elements leading to dissatisfaction were observed across multiple areas, including the class organization, the class content, and the learner factors. This study holds significance as it offers targeted recommendations for enhancing online micro-teaching training sessions, grounded in the results obtained, and establishes a foundational dataset for subsequent research in this area. 본 연구는 학점은행제 교육기관에서 예비 한국어교원들을 대상으로 실시되는 비대면 한국어교육실습 중 모의실습에 대한 개선점, 만족도 및 불만족도 요인을 조사하고, 향후 한국어교육에서의 비대면 모의실습의 수업 만족도를 높이기 위한 방안을 제시하고자 실시되었다. 이러한 목적을 달성하기 위해 자기보고식 설문을 통해 132명의 실습생들로부터 데이터가 수집되었으며, IPA 및 어휘네트워크 분석 기법을 통해 데이터를 분석하였다. 분석 결과를 요약하면 다음과 같다. 첫째, IPA 분석 결과로서 중점 개선 영역에는 ‘보조자료제작’ 경험의 제공, 보다 풍부한 ‘기술영역에 대한 피드백 제공’ 및 더욱 충분한 ‘교육 현장에 대한 이해 도모’가 포함되었다. 둘째, 주요 만족도 요인으로서 수업방법 요인, 학습자 요인 및 수업내용 요인 측면에서 다양한 세부 만족도 요인이 확인되었다. 셋째, 주요 불만족 요인으로서 수업구성 요인, 수업내용 요인 및 학습자 요인 측면에서 다양한 세부 불만족 요인이 관찰되었다. 본 연구는 탐색된 연구 결과를 바탕으로 비대면 모의실습 수업 개선 방안에 대한 제언점을 제공하며, 향후 관련 연구를 위한 기초자료를 제공했다는 측면에서 그 의의가 있다.

교회교육파노라마 : 수서교회 부부안식 플러스

황명환 장로회신학대학교 기독교교육연구원 2009 교육교회 Vol.377 No.-

과부하에 의한 전기화재

황명환,이덕출,Hwang, Myeong-Hwan,Lee, Deok-Chul 한국화재보험협회 1990 防災와 保險 Vol.46 No.-

방전 플라스마에 의한 CFC-12(CCl2F2)의 분해

황명환,우인성,조정국,강현춘,안형환,이한섭,강안수 한국산업안전학회 1999 한국안전학회지 Vol.14 No.3

Decomposition efficiency, power consumption, and applied voltage of CFC(Chlorofluorocarbon) were investigated by SPCY(surface induced discharge plasma chemical processing) reactor to obtain optimum process variables and maximum decomposition efficiencies. Decomposition efficiency of CFC-12 with various electric frequencies(5∼50㎑). flow rates (100∼1,000mL/min), initial concentrations(100∼1,000ppm), electrode materials(W, Cu. Al), electrode thickness(1, 2, 3mm) and reference gases(N₂, O₂, air) were measured and the products were analyzed with FT-IR. Experimental results showed that at the frequency of 10kHz, the highest decomposition efficiency of 92.7% for CFC-12 were observed at the power consumptions of 29.6W, respectively, and that decomposition efficiency decreased with increasing frequency above 20㎑ and decomposition efficiency per unit power were 3.13%/W for CFC-12. Decomposition efficiency was increased with increasing residence times and with decreasing initial concentration of pollutants. Decomposition efficiency was increased with increasing thickness of discharge electrode and the highest decomposition efficiency was obtained for the electrode diameter of 3mm. As the electrode material, decomposition efficiency was in order that tungsten(W), copper(Cu), aluminum (Al).

코로나 대전된 복합절연재료의 표면상태가 전위감소에 미치는 영향

황명환,정재희,조한구,송진호,이덕출 한국산업안전학회 1997 한국안전학회지 Vol.12 No.2

Especially, Fiber glass Reinforced Plastics(FRP) is the best composite insulating material which has been so far. Therefore, it's worthy of notice to investigate on the corona electrified composite insulating material by surface condition. And then some other materials will be focussed on. In this study, charge decay were measured with charging-time and grid voltage on FRP composite material surface in order to analyze the mechanism. As a result we have studied that the way of the composite glass fiber(GF) and Polymer and the condition of the contaminated surface was different. In case of the GF is mixed with vertical, charge decay speed is fast because the charge is easily leaked. On the other hand, the surface charge decay speed is depend on conductive or insulated of the contaminant.

유한 요소법을 이용한 저압 배전용 전선퓨즈의 I-t 특성 해석

황명환,박두기,이세현,한상옥 한국조명전기설비학회 1997 조명.전기설비 Vol.11 No.6

In this paper, we deal with the I -t characteristic of low voltage distribution fuse (line fuse). That fuse element has two parts;One is low temperature melting element(LTME) to put up with over current and the other is high temperature melting element (HTME) which put up with large current. Melting charateristic of fuse is determined by L TME and HTME. So we verified their properties of fuse design, mathematically, by simulating the thermal and electric characteristics of each other. We simulated the I-t characteristic of line fuse by using the numerical method;Finite Element Method(FEM). Then, we could acquire very similar result at the HTME and L TME area when compared the simlation result with experimental one. 본 논문에서는 저압 배전용 전선퓨즈의 I-t 특성을 다루었다. 전선퓨즈 엘리먼트는 과전류 영역을 담당하는 낮은 온도 용융영역(LTME)과, 대전류 영역을 담당하는 높은 온도 용융영역(HTME)으로 나누어 진다. 이들부분에 의하여 퓨즈의 용단특성이 결정되는 것이다. 따라서 이들 부분에 대한 열적, 전기적인 특성을 시뮬레이션하므로서, 퓨즈 엘리먼트 설계의 타당성을 이론적으로 검증하였다. 유한요소법(Finite Element Method)을 이용하여 전선퓨즈의 I-t특성을 시뮬레이션 하였다. 그리고 시뮬레이션 결과와 실혐결과를 비교해 보았을 때 대전류영역과 소전류영역에서의 상당히 유사한 결과를 얻을 수 있었다.

MR Imaging of Rat Glioma using Polysorbate-coated Magnetic Nanocrystals as a Blood-Pool Contrast Agent

황명환 한국실험동물학회 2012 한국실험동물학회 학술발표대회 논문집 Vol.2012 No.8