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김근묵 수원대학교 기초과학연구소 1992 基礎科學論文集 Vol.1 No.-
CdS/InP solar cells are fabricated and characteristics are investigated. The current-voltage characteristics measured reveals the knee voltage and the breakdownvoltage to be 1.0 volt and 11 volts. And the spectral respons of photovoltage are nearly uniform form 500 nm to 1㎛ range. The photocurrent-photovoltage curve obtained short curicut current density, J_sc and open curcuit voltage, V_oc 5 ㎃/㎠ 0.5 volt under the irradiation of 50 ㎽/㎠ shows the filling factor 0.6 and power conversion efficiency 1.2 % respectively.
부호화한 주파수 도약 대역 확산 통신 네트워크의 성능 분석
김근묵,정영지,홍은기,황금찬 한국통신학회 1992 韓國通信學會論文誌 Vol.17 No.7
본 논문에서는 AWGN, 협대역재밍, 페이딩, 사용자간간섭이 혼재하는 채널에서 FH/SSMA시스템의 성능을 분석하였다. 다수의 사용자가 존재할 때 나타나는 주파수총돌(사용자간 간섭)을 고려하면서,채널의 보조정보를 이용할 경우와 이용하지 않을 경우를 구분하여 부호별 에러확률과 처리능력을 계산하였다. 분석 결과, 복합적인 간섭이 혼재하는 채널환경에서 RS부호가 길쌈부호보다 우수하며, 쇄상 부호는 같은 부호화율인 RS부호와 거의 동일한 성는을 나타냈다. 페이딩이나 협대역재민등 복합적인 간섭이 존재하는 채널환경에서는 에러정정용 부호로서 RS 부호가 최적인 것으로 나타났다. This paper alms to analyse the performance of frequency hopping /spread spectrum multiple access system by employing the channel with mixture of AWGN, partial band Jamming, fading and user interference. The performance analysis of FH /SSMA system, taking account of frequency 'hit'(user Interference ) which occurs in the presence of multiple user, produces the following numerical results by computing error probability and throughput of each code in two cases whether the side Information about channel is used or not. The numerical results are as follows : When composite interferences coexist In channel, RS code Is significantly superior to convolutional code in terms of performance. Concatenated code provides the same performance as RS code. The above results show that RS code is pertinent as error-correction code.
X-선 회절법에 의한 CdS 분말과 박막의 구조에 관한 연구
김근묵,한은주 수원대학교 기초과학연구소 1997 基礎科學論文集 Vol.6 No.-
The heat-treatmented CdS powder samples had been changed their X-ray spectra depending on their heat-treated temperature. There were no differences between the as-grown sample and the heat-treated samples for the temperature range of 300℃~450℃. But the new peaks of Cd_2SiO_4 were appeared over 450℃ and the peaks were very clear at 570℃. The heat-treatment conditions of the CdS thin film samples affected to their X-ray spectra. In the cases of atmosphric condition, it was shown that the superposition of CdS thin film spectra and CdO spectra in the X-ray diffraction pattern.
金根默 水原大學校 2005 論文集 Vol.23 No.-
Cu/AsSe glassy semiconductor fabricated by thermal evaporation method were investigated for the dependence of thickness ratio, temperature, and response time of the Cu/semiconductor hetero-layers. The thickness ratio of Cu-AsSe system being equal to 8 the limiting rates of Cu-diffusion into the AsSe semiconductor layer are reached. The dependence of surface resistance of the Cu/AsSe sample for the ratio of dAsSe/dCu= 8. which is above critical and equals to 270 K. And the response time of the same sample at 340 K. and 310 K are measured 7 sec and 30 sec respective.
WO₃박막에서 CdSSe-interlayer의 광학적 효과
김근묵 수원대학교 기능성생명소재연구소 2007 자연과학연구논문집 Vol.6 No.1
As the color ation phenomena depending upon the wavelength of a tungsten oxide is suitable to a material for photochromic windows and can be used for the windows of automotives and aircrafts, since it was presented by S. K. Deb in 1973 many researches have been under way in this area. In this research, despite the merit that WO₃ materials the high energy gap of 3.25eV and the transparent and strong light absorption state the absorption center has a bias toward the near UV region, and therefore in order to move the absorption center to the visible region, using the heat vapor deplation method a CdSSe-interlayer was inserted and vapor deposited, by which a photochromic thin film has been produced. As a result of X-Fay diffraction measurement, the structure of CdSSe was hexagonal and at 22.9˚ there appeared a diffraction line corresponding to a plane (020) but WO₃ showed an amorphous state. Therefore it is thought that it may be possible to produce a discoloration element that is moved to the visible region from the UV region by making use of the CdSSe-interlayey for the windows of photochromism.