발전기 고정자 권선용 마이카/에폭시 수지의 표면 및 구조분석

이상교,심재선,정의남,송우창,박하용,심상흥,임윤희,박종국,심낙순 三陟大學校 1998 論文集 Vol.31 No.1

The purpose of this study is to determine the ageing mechanism of Mica/Epoxy composite material for large generator stator windings in order to estimate remaining life of generator. X-ray analysis is performed to investigate the position and structure of mica crystal in insulation materials. The phase change of aged and sound specimen under each atmosphere isn't observed. Surface analysis of insulation materials by optical microscope also show that the sound and aged specimen, sliding phenomenon by shear and thermal stress is observed both interface between mica and epoxy.

(Sr·Ca)TiO₃계 세라믹의 절연파괴 특성

심상흥 三陟大學校 2000 論文集 Vol.33 No.1

The (Sr0.85·Ca0.15)TiO₃+0.006Nb₂O5 ceramics were fabricated to form semiconducting ceramics by sintering at about 1350[℃] in a reducing atmosphere. After being fired in a reducing atmosphere, metal oxides(CuO) was painted on the both surface of the specimens to diffuse to the grain boundary. XRD analysis results showed that the specimens used in this study have the cubic perovskite structure. The Voltage-current characteristics of specimens used in this study appears that it is due to space charge condensed to interface between grain and grain boundary. The conduction mechanism of the specimens observed in the temperature range of 20~125[℃], and is divided into three regions having different mechanism as the current increased: the region I shows the ohmic conduction. The region II can be explained by the Poole-Frenkel emission theory, and the region III is dominated by the tunneling effect.

α-ZnAl₂S₄단결정의 Energy Gap의 온도 의존성에 대한 열역학적 함수 추정

심상흥,심낙순,박종국,오재한,박광호 三陟大學校 1999 論文集 Vol.32 No.1

In this work ? single crystals were grown by the chemical transporting reaction(CTR) method using high purity(6N) elements. The structure of grown ZnAl2S4 single crystals were cubic structure. The optical energy band gap was indirect band gap and the temperature dependence of optical energy gap was fitted well to Varshni equation. Also, the entropy, enthalpy and heat capacity were deduced from the temperature dependence of optical energy gap.

방향성 결합형 광 소자의 최적화 해석

심상흥,이상교,박종국,박하용 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.1

Optimum conditions for the optical coupling phenomenon were studied through the BPM simulation technique for the design of directional optical divice which consists of the directional coupler. The parameters used in the simulation mere 1.5[㎛] wavelengths for light source, 3[㎛] of waveguide width. 2.25 of waveguide refractive index. 2.2 of substrate refracvive index, 3[㎛] of gap between wareguides and 18[V] of applied voltage respectively. Therfore. the optical paramaters will become efficient and easy using the electrode process to the optical device(modulator) fabrication.

내외통제성, 인지정서조절 전략과 주관적 안녕감에 관한 연구

정상원,심흥섭 西江大學校 學生生活相談硏究所 2008 人間理解 Vol.29 No.-

본 연구에서는 내외통제성, 인지정서조절 전략과 주관적 안녕감의 관계에 대해서 알아보았다. 연구대상은 경기, 서울, 기타 지역에 소재하고 있는 공립유치원 교사 256명이며 설문조사를 실시하였다. 결과는 다음과 같다. 첫째, 내적통제가 높은 사람은 낮은 사람보다 주관적 안녕감이 높은 것으로 나타났다. 그러나 주관적 안녕감 하위 요인별로 살펴보았을 때는 정적 정서에서만 유의미한 차이를 보였다. 둘째, 적응적 전략을 많이 사용할수록, 부적응적 전략을 덜 사용할수록 주관적 안녕감이 높은 것으로 나타났다. 그러나 주관적 안녕감의 하위 요인별로 살펴보았을 때, 적응적 전략을 많이 사용할 경우에는 삶의 만족도, 정적 정서, 부적 정서 모두에서 차이를 보였으나 부적응 전략을 덜 사용할 경우에는 삶의 만족도와 부적 정서에서만 차이를 보였다. 셋째, 내적통제가 높은 사람은 낮은 사람보다 적응적 전략을 더 많이 사용하는 것으로 나타났다. 넷째, 내외통제성과 인지정서조절 전략이 주관적 안녕감에 미치는 영향을 살펴본 결과 인지정서조절 전략이 내적통제성보다 주관적 안녕감을 더 잘 예측하는 변인이었다. The purpose of this study was to investigate the relations among internal-external locus of control, cognitive emotion regulation strategies and subjective well-being. For the study, 256 public kindergarten teachers in Seoul, Kyounggi & other areas participated. The results of this study were as follows; First, subjects who have high internal locus of control scored higher on subjective well-being than subjects who have low internal locus of control. Second, in case of using more adaptive strategies or using less maladaptive strategies, subjective well-being were higher. Third, subjects who have high internal locus of control used more adaptive strategies. Fourth, Cognitive Emotion Regulation Strategies rather than internal-external locus of control could better predict subjective well-being.

LiNb_3O_8의 고주파 유전특성

윤상옥,윤종훈,심상흥,강기성 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-

Recently many Microwave devices have been newly developed as the demands for mobile communication and satellite broadcasting have been increased. Microwave dielectrics can be use in dielectric resonator, duplexer filter, VCO, GPS antenna and so on. The dielectric properties required for such application are high dielectric constant(ε_r), high Q value and low temperature coefficient of resonant frequency(τ_f). These requirement correspond to necessities for size reduction, excellent frequency selectivity, good temperature stability of devices. This study was focussed on the improvement and understanding for low-temperature sinterbility and microwave dielectric properties in LiNb_3O_8 compositions. The main topics of this study was the relationship between sinter behavior and microwave dielectric properties on LiNb_3O_8 system. As a result, the dielectric constant and Q×f_0 increased linearly with increase in the sinter density. The dielectric constant is about 34 and the Q×f_0 at a microwave frequencies is over 58000.

LCC형 고주파 공진 인버터의 특성해석에 관한 연구

이경호,심상홍,심낙순,원재선 三陟大學校 2001 論文集 Vol.34 No.1

This paper describes characteristics and operating principles of inverter according to the variable capacitance of the DC voltage source separated capacitor use in the conventional HB type high frequency resonant inverter. In the case of variable capacitance of the DC voltage source separated capacitor, the analysis of inverter circuit has generally described by using normalized parameter and operating characteristics has been evaluated in term of switching frequency and parameters. According to the calculated characteristics value, a method of the circuit designs and operation characteristics of the inverter is proposed. Also, We performed an experiment to prove the validity of the characteristics analysis of proposed inverter. The theoretical results are in good agreement with the experimental ones. In the future, this proposed inverter shows that it can be practically used as a power source system for the lighting equipment of discharge lamp. DC-DC converter etc.

열처리에 따른 Cd₁-xZnxS/In 박막의 광학적 및 전기적 특성 분석

송우창,이경호,심상흥,이상교,심재선,박종국 三陟大學校 2002 論文集 Vol.35 No.-

In this thesis, effects of the thickness of indium films and the annealing temperature on optical and electrical properties of chemically deposited CdZnS films for the efficiency of the Cd1-xZnxS/CdTesolar cells were investigated. To improve the electrical conductivity of Cd1-xZnxs films, thin indium films(10-4Onm thickness)were evaporated on the suface of Cd1-rZnxs films. Experimental parameters such as indium film thickness, Zn mole fraction, and the annealing temperature in terms of structural and electrical properties of Cd1-xZnxs films were investigated. The diffusion process was carried out by heating the sample in air at 150-550℃ for 20 minute As the indium film thickness is increased, the resistivity decreases and the lowest value(0.3 O -cm)is obtained for Cd1-xZnxs films annealed at 450℃ with 40nm of the thickness.

RF 스퍼터링법에 의한 SCT박막의 전기적 특성

김원종,정의남,심상흥,박하용 三陟大學校 2001 論文集 Vol.34 No.1

In this study, The (Sr1-xCax)TiO3(SCT) thin films are deposited on Pt-coated electrode (Pt/TiN/SiO2/Si) using RF magnetron sputtering method with substitutional contents of Ca at various substrate temperature. The structural properties of SCT thin films are analyzed using SEM, XRD, and EDS, and the electrical properties are studied by measuring the dielectric properties and the electrical properties are studied by measuring the dielectric properties and electrical conduction. The experimental results of electrical properties are summarized as follow. The dielectric constant is increased with increasing the substitutional contents of Ca, while it is decreased if the substitutional contents Ca exceeded over 15[mol%]. The maximum dielectric constant of thin film is obtained by annealing at 600[℃]. The dielectric constant changes almost linearly in temperature ranges of -80~+90[℃]. The temperature properties of the dielectric loss have a stable value within 0.1 independent of the substitutional contents of Ca. The capacitance characteristics had a stable value within ±5[℃]. The drastic decrease of dielectric constant and increase of dielectric loss in SCT thin films is observed above 200[㎑]. All SCT thin films used in this study show the phenomena of dielectric relaxation with the increase of the increase of frequency. Ⅴ-Ⅰ characteristics of SCT thin films show the increasing leakage current with the increases of deposition temperature.

비장의 상피양 낭종 : 1예 보고 A Report of A Case

양기화,강창석,심상인,김선무,함흥정 최신의학사 1986 最新醫學 Vol.29 No.12