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探究的 科學學習을 위한 中·高等學校 科學室 운영 실태에 대한 考察
李官敎 조선대학교 기초과학연구소 1981 自然科學硏究 Vol.4 No.1
The trend of modern science education is to study science investigatively by virtue of experiment in the laboratory, by the students themselves rather than the teacher. Accordingly, this paper is an attempt to grasp the actual condition of supervision of science laboratories in secondary schools through questionaires given to science teachers in secondary schools and an inquiry into improvement measures for establishing an investigative environment and furthering degree of the student participation in experimental learning.
Hot Wall Epitaxy (HWE)법에 의한 CuInse<sub>2</sub> 단결정 박막 성장과 열처리 효과
이관교,홍광준,Lee Gyungou,Hong Kwangjoon 한국재료학회 2004 한국재료학회지 Vol.14 No.11
A stoichiometric mixture of evaporating materials for $CuInse_2$ single crystal thin films was prepared from horizontal electric furnace. To obtain the single crystal thin films, $CuInse_2$ mixed crystal was deposited on thoroughly etched semi-insulating GaAs(100) substrate by the hot wall epitaxy (HWE) system. The source and substrate temperatures were $620^{\circ}C\;and\;410^{\circ}C$, respectively. The temperature dependence of the energy band gap of the $CuInse_2$ obtained from the absorption spectra was well described by the Varshni's relation, $E_{g}(T)=1.1851 eV - (8.99{\times}10^{-4} eV/K)T^2/(T+153 K)$. After the aa-grown $CuInse_2$ single crystal thin films was annealed in Cu-, Se-, and In-atmospheres, the origin of point defects of $CuInse_2$ single crystal thin films has been investigated by the photoluminescence(PL) at 10 K. The native defects of $V_{cu},\;V_{Se},\;Cu_{int},\;and\;Se_{int}$ obtained by PL measurements were classified as a donors or accepters type. And we concluded that the heat-treatment in the Cu-atmosphere converted $CuInse_2$ single crystal thin films to an optical n-type. Also, we confirmed that In in $CuInse_2$/GaAs did not form the native defects because In in $CuInse_2$ single crystal thin films existed in the form of stable bonds.
이관교,유상하,홍광준 조선대학교 동력자원연구소 1987 動力資源硏究所誌 Vol.9 No.2
The single crystak if CdTe was grown by the Bridgman method and lattice constant = 6.48Å was determined from X-ray diffraction. Temperature dependence of the energy band gap have been found for measurements of transmission, photoconductivity and photocurrent variations versus wavelength at 50˚K∼300˚K. The energy band gap was measured to be Eg=1.61 eV at 0˚K by extrapolation method, and temperature coefficient β was -4.×10^-4 eV/˚K by photoconductivity experiments.
베이커리 전문점의 기능성 제품속성에 따른 지각된 가치가 구매행동에 미치는 영향 - 광주광역시를 중심으로 -
이관교,최상호 한국호텔리조트학회 2023 호텔리조트연구 Vol.22 No.2
This study is a study on the effect of perceived value on purchase behavior according to the functional product attributes of bakery specialty stores. From June 1st to June 30th, 2022, 275 copies (92 %) of the questionnaire was finally used for empirical analysis. Hypothesis verification was conducted using the program of SPSS 21.0. First, it was found that the functional product attributes of bakery specialty stores had a partially significant effect on the perceived value. Second, it was found that functional product attributes of bakery specialty stores had a partially significant effect on purchase behavior. Third, perceived value was found to have a significant effect on purchase behavior. Therefore, if product development is continued with an emphasis on the development of functional products with healthiness, quality, originality, and diversity, it gives consumers a sense of value and satisfaction and increases their desire to purchase, suggesting that purchasing behavior is achieved.
HgGa<sub>2</sub>S<sub>4</sub> 단결정의 광학적 특성연구
이관교,이상열,강종욱,이봉주,김형곤,현승철,방태환 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.11
HgGa$_2$S$_4$ single crystals were grown by the chemical transport reaction method. The HgGa$_2$S$_4$ single crystal crystallized into a defect chalcopyrite structure (I 4). The lattice constants of the single crystal were found to be a = 5.635 $\AA$ and c = 10.473 $\AA$. The direct and indirect optical energy gaps were found to be 2.84eV and 2.78eV, respectively. Photoluminescence peaks of HgGa$_2$S$_4$ single crystal were observed at 2.37 eV, 2.18 eV, and 1.81 eV. In the single crystal, the donor level of 0.25 eV, the acceptor levels of 0.97 eV and 0.41 eV were obtained by TSC, PICTS, and absorption measurements. The photoluminescence peaks were analyzed to relate to the indirect conduction band, the donor level, and the acceptor levels.
경계점에서 파동의 속도변화 원인에 관한 고찰 : Coil Spring 파동을 중심으로
이관교 朝鮮大學校 師範大學 1974 師大論文集 Vol.5 No.-
When pulse is given to a coil spring, the cause of variables of velocity of pulse at the boundary of the coil spring and the velocity of pulse transmitted to the coil spring are proportional to the tension. Take two coil springs of equal length. If one of them is extended by force, the velocity of pulse of the extended coil spring is proportionally faster to extension than that of the unextended one. From the point of view of pulse transmission, each of the two coil springs may be said a completely different medium from the other. When two pulses collides each other, the velocity of pulse equals the composition of the two variable positions; the maximum variable position also equals the sum of the two pulses.
Comparison of the AM and FM wave forms
Lee,Kwan Kio,Wee,Sung Dong 朝鮮大學校 師範大學 1974 師大論文集 Vol.5 No.-
In every superposition wave, it can be shown that the sine waves collects into a single band wave through the experiment of an oscilloscope. In the AM waves the amplitude varies every hour but in the FM waves the frequency varies momentarily, and the right path modulaion in the AM waves indicates the ratio of the modulation, while the right path modulation in the FM waves indicates an index of the modulation. The frequency of the FM waves varies according to the signal of the modulation every hour, but the frequency of the AM waves does not vary. The FM wave is complex compared with the production of the band wave in AM waves. In AM and FM waves, we can see directly that the modulation of actual waves of takes place when the frequency deviation expresses a vector under the modulation condition. A vector of an FM wave seems to indicate a composition of a medium vector and a side vector.
環境放射能 測定 : 光州東部 地域을 中心으로 on the eastern part of Gwang Ju
金炫九,李官敎 조선대학교 원자력연구소 1981 原子力硏究 Vol.1 No.-
A systematic survey on the environmental radioactivity at Chosun University and its surrounding areas during the year of 1981 was carried out through various environmental samples, which were precipitation, surface soil, stream water, pine needles, and others. Out of these samples natural background radiation was surveyed. No significant radioactive materials from the Atomic Energy Research Institute attached to Chosun University and the Radioisotopes Laboratory of Chosun University Hospital were detected during this period.
HWE 방법에 의한 CdSe 박막 성장과 광전기적 특성
홍광준,이관교,이상열,유상하,신용진,서상석,정준우,정경아,신영진,정태수,김택성,문종대,김혜숙 ( K . J . Hong,K . K . Lee,S . Y . Lee,S . H . You,Y . J . Shin,S . S . Suh,J . W . Jeong,K . A . Jeong,Y . J . Shin,T . S . Jeong,T . S . Kim,J . D 한국센서학회 1997 센서학회지 Vol.6 No.4
The CdSe thin films were grown on the Si(100) wafers by a hot wall epitaxy method (HWE). The source and substrate temperature are 600? and 430 respectively. The crystalline structure of epilayers was investigated by double crystal X-ray diffraction(DCXD). Hall effect on the sample was measured by the van der Pauw method and studied on the carrier density and mobility dependence on temperature. From Hall data, the mobility was increased in the temperature range 30K to 150K by impurity scattering and decreased in the temperature range 150K to 293K by the lattice scattering. In order to explore the applicability as a photoconductive cell, we measured the sensitivity(γ), the ratio of photocurrent to darkcurrent(pc/dc), maximum allowable power dissipation(MAPD), spectral response and response time. The results indicated that the photoconductive characteristic were the best for the samples annealed in Cu vapor compare with in Cd, Se, air and vacuum vapour. Then we obtained the sensitivity of 0.99, the value of pc/dc of 1.39 X 10^7, the MAPD of 335mW, and the rise and decay time of l0ms and 9.5ms, respectively