PECVD μc-Si:H 막을 이용한 박막트랜지스터의 제조

문교호,최시영 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1

Top gate μc-Si:H TFTs were fabricated and the electrical charactristics were analyzed using current-voltage measurements. μc-Si:H films were deposited by PECVD at the various condition such as hydrogen dilution ratio, temperature and RF power density. Then we studied their electrical and optical properties. In this study, field effect mobility of TFT was 0.94cm^(2)/Vs and-on/off was ~10^(4) and threashold voltage was 5.06V.

江原道 旌善郡의 地名에 관한 연구 : 촌락명을 중심으로

文恩京,盧美慶 동국대학교 지역환경연구소 1994 地域環境 Vol.- No.12

흰쥐 재생간의 알콜대사효소들의 활성치

문교철,곽춘식,정성광,김여희 啓明大學校 醫科大學 1988 계명의대학술지 Vol.7 No.2

A study was made on the change in the activities of the following during 10 post-operative days: alcohol dehydrogenase of regenerating rat livers after 70% (median and left lateral lobes) partial hepatectomy. After partial hepatectomy in the rats, activities of regenerating liver alcohol dehydrogenase significantly increased in the sixth day. The activities of microsomal ethanol-oxidizing system in the regenerating liver markedly increased from the third day after partial hepatectomy. However, no significant changes in hepatic catalase was noted throughout the experiments. The activities of cytosolic and microsomal aldehyde dehydrognease in the regenerating liver significantly increased from the sixthe day and the third to the sixth day respectively, but mitochondrial aldehyde dehydrogenase showed no change.

가을보리 재배기간중의 기상변화

심교문,이정택,윤성호,황규홍 한국농림기상학회 2000 한국농림기상학회지 Vol.2 No.3

The northward shift of the cultivation region of winter barley has been considered because of consecutive warm winters from the middle of 1980's. There was 1.02℃ rise in mean air temperature during winter barley cropping season from 1975 to 1998. During this period, the maximum air temperature affected the mean air temperature rise rather than the minimum air temperature. The amount of mean precipitation was 513.3mm during winter barley cropping season from 1975 to 1998 and was least in 1992. Sunshine hours has increased little by little in the all regions except rural regions. The air temperature during winter barley cropping season from 1987 to 1999 in which the winter was warm was higher than the normal air temperature(1961∼1990). On the other hand, the air temperature during winter barley cropping season from 1974 through 1986 was similar to the normal air temperature. The amount of mean precipitation during winter barley cropping season from 1987 through 1999 was similar to the normal precipitation except April. During this period, the amount of mean precipitation of April was lower by 26mm than the normal year(1961∼1990). Sunshine hours during winter barley cropping season from 1987 to 1999 decreased generally in comparison with a normal year. Considering the air temperature rise during wintering from 1987 to 1998, it might be possible to extend the cropping area of winter barley northward.

CO_2 초임계 유체/전도성 에멀젼용액을 이용한 구리판에 대한 니켈 나노도금에 관한 연구

홍교민,홍성철,김문선,정재관 한국공업화학회 2002 응용화학 Vol.6 No.2

In this study, experiments of a nickel elecroplating were performed by a conductive emulsion solution of CO_2/electrolyte/surfactant/entrainer in the supercritical nanoplating system to investigate the effect of the resistivity on plating properties. Resistivity values decreased 60, 35, and 22 Ω at 20, 30, and 50 wt% electrolyte, respectively, and over 60 wt%, the resistivity value was kept constant at 20 Ω. Surface properties of nickel film electroplated by the emulsion solution with 60 wt% electrolyte at 8 MPa was better than that at atmospheric pressure.

Supercritical Nano-Plating 시스템에서 전기도금된 니켈 막의 표면특성에 관한 연구

홍교민,김문선,정재관 한국공업화학회 2003 응용화학 Vol.7 No.2

In this study, experiments of a nickel electroplating were performed in a supercritical nano-plating(SCNP) system using CO₂as a supercritical fluid. Surface properties of nickel film electroplated by the electrolyte solution with 0.2 vol% surfactant and volume ratio of CO₂and electrolyte as 1:9 was the best in the plating properties, where surface roughness(Ra) of nickel film plated for 30 min by SCNP was 0.021 ㎛. The property of plated film with this new method was better than that by a conventional method.

수용액에서 γ형 알루미나 표면에 대한 니켈이온(Ⅱ)의 흡착특성

홍교민,김문선,정재관 한국공업화학회 2003 공업화학 Vol.14 No.3

γ형 알루미나의 흡착특성을 구명하기 위하여 본 실험에서는 수용액에서 γ형 알루미나를 흡착제로 이용하여 온도와 pH가 니켈이온(Ⅱ)의 흡착능에 미치는 영향을 관찰하고 알루미나 표면과 니켈이온(Ⅱ) 간의 Langmuir와 Freundlich 흡착등온식과 Lagergren 흡착속도식을 결정했다. 5 g Al_2O_3/L의 조건에서 니켈이온은 10 h에 흡착평형상태에 도달했다. PH 2~6의 범위에서 pH가 증가할 때 흡착량은 급격히 증가하다가 PH 6에서 최대 흡착량을 나타냈으며 pH 6~9의 범위에서는 pH가 증가하여도 흡착량은 일정했다. 온도 20℃에서는 흡착량이 적었으나 30℃에서 급격히 흡착량이 증가하였으며 30~50 ℃의 범위에서는 온도 증가에 따라 흡착량이 완만하게 증가했다. Freundlich 흡착등온식의 결정계수는 0.9489로 Langmuir식의 0.9265보다 높았으며 Lagersen 흡착속도식에서의 k_ad값은 0.0023 h^-1으로 결정계수는 0.9497이였다. In this paper, Langmuir and Freundlich adsorption isotherms, and Lagergen adsorption rate were determined and the effect of temperature and pH on the adsorptivity of Ni(Ⅱ) ions were investigated in order t() stud)'the adsorption characteristics of γ-type alumina. For 5 g Al_2O_3/L, the adsorption equilibrium was obtained in 10 h. The adsorption amount increased rapidly when pH incrteased from 2 to 6, and the maximum adsorption amount was observed at pH 6. For pH 6 to 9, however, the adsorption amount remained constant. The adsorption amount was low at 20℃. However, The adsorption amount increased with increased in temperature; the amount increased rapidly at 30℃ and increased linearly with temperature from 30 to 50℃. The correlation coefficient (R_2) for Freundlich adsorption isotherm was 039489%, and this was higher than that for Langmuir adsorption isotherm of 0.9268%. The adsorption coefficient (k_ad) of lagergen equation was 0.0023h^-1, and the correlation coefficient (R^2) was 0.9497.

진공포장한 한우와 홀스타인 도체 B₂및 D등급 냉장육의 품질특성

이교연,문윤희 慶星大學校 1998 論文集 Vol.19 No.2

This study was conducted to investigate the quality characteristics of vacuum-packaged and chilled beef. Four kinds of beef prepared from carcass grade B2, D of Korean native cow and Holstein. The physicochemical characteristics and palatability of beef loins were compared on the 30th day chilled with vacuum-package. The pH of Korean native beef B2, D grade on the 30th day chilled with vacuum-package were 5.74 and 5.92, Hostein beef B2, D grade were 5.71 and 5.83 by Korean native beef. D grade was highest. the lactic acid contents of Korean native beef B2, D grade were 295.30 and 290.63, Holstein beef B2, D grade were 307.33 and 369.02㎎/100g by Holstein beef D grade was highest. The hardness of Korean native beef B2, D grade on the 30th day chilled with vacuum-package were 109.12 and 165.42, Holstein beef B2, D grade were 105.27 and 167.15㎏/㎠ by Holstein beef B2 grade was lowest, and chewiness of Korean native beef B2, D grade on the 30th day chilled with vacuum-package were 187.11 and 213.62, Holstein beef B2, D grade were 111.38 and 207.62g by Holstein beef B2 grade was lowest, and myofibilar fragmentation index(MFI) were 68.27 and 65.27, Holstein beef B2, D grade were 77.47 and 69.40 by Hosstein beef B2 grade was highest. The inosine(Hx) of Korean native beef B2 D grade on the 30th day chilled with vacuum-package were 58.37% and 55.47%, Holstein beef B2, D grade 54.75% and 52.26% by Korean native beef B2 grade was highest, and those were increased compared on the 2nd day after slaughtering. the monounsaturated fatty acid(MUFA)/saturated fatty acid(SFA) ratios of Korean native beef were 1.48 and 1.32, Holstein beef 1.44 and 1.41 by Korean native beef B2 grade was highest, and B2 carcass grade were higher than D carcass grade. The cooking loss and cooking shortening ratios of Korean native beef B2, D grade on the 30th day chilled with vacuum-package were 15.41%, 14.70% and 19.51%, 26.61%, Holstein beef B2, D grade were 15.63%, 15.27% and 18.59%, 33.20% by Korean native beef B2 grade was lowest. The texture and palatability of cooked meat of on the 30th day chilled with vacuum-package were good in order Korean native beef B2 grade, Holstein beef B2 grade, Korean native beef D grade, and Hostein beef D grade.

AM 放送의 指向性 안테나의 特性에 關한 硏究

李門浩,김종교 全北大學校 1981 論文集 Vol.23 No.-

The field radiated by any small linear antenna (=nondirectional antenna) is distributed uniformly. This type of radiated pattern is desirable for many broadcasting applications, but it is undesirable for point-to point and preferred coverage applications. The field strength can be increased in selected directions by appropriately exciting several antennas simultaneously. That is applications in which it is desired to radiate most of the energy in one direction, for example toward population city.

모델 추종형 적응 퍼지 제어기의 설계

남문현,김낙교,손재현 건국대학교 산업기술연구원 1995 건국기술연구논문지 Vol.20 No.-

In this paper, reference-model following fuzzy controller (RMFFC) was proposed in order to overcome the difficulty of extracting rules and defects of the adaptation performance in the FLC. RMFFC comprised inner feedback loop consisting of the FLC and plant, and outer loop consisting of adaptation mechanism which of the FLC. A Referenced-model was used for design criteria of a fuzzy controller which characterizes and quantizes the control performance required in the overall control system. Tuning control rules of FLC is performed by the adaptation mechanism. For this, the fuzzy model for tuning the control rules is designed in accordance with the feature of error information. Proposed algorithm was verified through simulation for various plant models which have different characteristics. And the results are obtained as follows. 1) Control performance required by a skilled operator was reflected to the control. 2) Unnecessary rule modification did not occur in steady-state, after completion of learning, by using the following error information 3) Performance of RMFFC was improved in various disturbances, comparing with conventional FLC and MRAC.