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Chemical Bath Deposition 방법으로 제작한 CdSe 박마의 특성
신영진,홍광준,이상열,유상하,서상석,문종대,신현길,김택성,송정훈,유기수,정태수 한국센서학회 1993 센서학회지 Vol.2 No.1
Polycrystalline CdSe thin films were grown on ceramic substrate using a chemical bath deposition (CBD) method. They were annealed at various temperature and X-ray diffraction patterns were measured by X-ray diffractometer in order to study CdSe polycrystal structure. Using extrapolation method of X-ray diffraction patterns for the CdSe samples annealed in N₂ gas at 450℃ it was found hexagonal structure whose lattice parameters a_o and c_o were 4.302 A and 7.014 A, respectively. Its grain size was about 0.3 ㎛. Hall effect on this sample was measured by Van der Pauw method and studied on carrier density and mobility depending on temperature. From Hall data, the mobility was likely to be decreased by piezo electric scattering at temperature range of 33 K and 200 K, and by polar optical scattering at temperature range of 200 K and 293 K. We measured also spectral response, sensitivity (γ), maximum allowable power dissipation and response time on these samples.
비육중인 HOLSTEIN 수소에 있어서 저질 조사료의 에너지 이용성에 관한 연구
한인규,김홍대,하종규,김완영,Yanglian, Feng 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.5
본 연구는 저질 조사료의 에너지 가치 및 이용성을 평가하기 위해서 평균체중이 400㎏인 비육중인 Holstein 수소 4두를 공시하여 수행하였다. 공시동물은 각각 호흡대사실에서 4가지 사료를 4×4 Latin square 방법으로 공급받았다. 대조구는 농후사료(50%)와 Chinese wildrye hay(50%) 사료를 사용하였으며, 처리구는 저질 조사료구로서 무처리 볏짚(100%). 요소처리 볏짚(100%) 및 Chinese wildrye 건초(100%) 등 3가지 사료를 이용하였다. 처리구간의 에너지소화율에 있어서는 유의적 차이가 나타나지 알았지만, 대조구는 처리구에 비하여 에너지소화율이 유의적으로 높게 나타났다(P<0.05). Chinese wildrye 건초만을 에너지 섭취수준을 달리하여 급여한 결과, 에너지섭취가 증가할수록 에너지소화율은 감소하였다. 또한 같은 시험에서, 조사료 입자가 감소할수록 에너지소화율이 증가하는 경향을 보였다. 메탄과 뇨를 통한 에너지 손실에 있어서 처리구 및 대조구간에 차이는 없었지만, 사료중의 NDF가 증가할수록 메탄생성이 증가하였다. 요소처리 볏짚과 Chinese wildrye 건초 처리구간에 K_m과 K_f 모두 비슷하였으며, 대조구의 K_f가 가장 높게 나타났다. 단백질과 지방의 체내축적은 대조구, Chinese wildrye 건초구, 요소처리 볏짚구 및 무처리 볏짚구 순으로 높았다(P<0.05). 본 연구 결과는 화학처리 볏짚이 에너지소화율과 이용성에 면에서 무처리 볏짚보다 우수하게 나타났으며, 특히 값비싼 Chinese wildrye 건초를 에너지 이용성 면에서 값싼 화학처리 볏짚으로 대체할 수 있는 가능성을 보였다. Four steers weighing average of around 400㎏ were used in a 4 × 4 Latin square design to study energy values of low quality roughages. The energy digestibilities of rice straw, treated rice straw, and Chinese wildrye hay were not significantly different. However, the digestibility of control diet (concentrate + Chinese wildrye hay) was significantly higher (P<0.05) than those of low-quality roughages. The energy digestibility of rice straw was not improved due to the treatment of urea-Ca(OH)₂. The result showed N digestibility tended to be higher in the steer fed treated rice straw. When effects of particle sizes of low quality roughage, Chinese wildrye hay, on energy digestibility were determined, there were no significant differences in GE intakes among the treatments of four particle sizes of the hay. Results also showed that energy digestibility tended to slightly increase as the particle size reduced. Methane production in relation to DE was the highest in the treatment of untreated rice straw, and the lowest with control diet. However, there were no significant differences among four feeding treatments. Urine excretion showed similar trends with methane production. Total energy loss via methane and urine against DE were 12.26, 22.93, 16.35, and 14.88 % in control diet, untreated rice straw, treated rice straw, and Chinese wildrye hay, respectively. The efficiency of utilization of DE was not significantly different among the treatments, but untreated rice straw showed the lowest efficiency. The results also showed that K_m, among untreated rice straw, treated rice straw, and wildrye hay were similar. These data also showed that both the K_m, and K_f from treated rice straw and Chinese wildrye hay were remarkably similar. This similarity clearly showed that treated rice straw had no effect on the efficiency of ME utilization for either K_m and K_f in fattening steers. The K_f of control diet was the highest among the treatment. With regard to body deposition of protein and fat, the results showed the higher values in the order of control diet, Chinese wildrye hay, treated rice straw, and rice straw. Based on these observations, this study regarding energy utilization clearly shows that a portion of expensive forages in the diet could be replaced with low-quality roughages such as treated rice straw.
RTCVD 법으로 성장한 Si1-xGex 에피막의 특성
김광일,배영호,강봉구,정욱진,군영규,손병기 한국센서학회 1996 센서학회지 Vol.5 No.2
The growth and characterization of heteroepitaxial Si_(l-x)Ge_x films grown by the RTCVD (Rapid Thermal Chemical Vapor Deposition) method were described. For the growth of Si_(l-x)Ge_x heteroepitaxial layers, SiH₄/ GeH₄ / H₂ gas mixtures were used. The growth conditions were varied to investigate their effects on the Si / Ge composition ratios, the interface abruptness and crystalline properties. The experimental data shows that the misfit threading dislocation in Si_(l-x)Ge_x / Si heteroepitaxial film of about 400 A thickness was not observed at the growth temperature of as low as 650℃, and the composition ratios of Si / Ge changed linearly with SiH₄ / GeH₄ gas mixing ratios in our experimental ranges. In the in-situ boron doping experiments, the doping abruptness would be controlled within several hundreds Å/decade.
고주파 마그네트론 스펏터링법으로 제조한 ZnO 박막의 기판에 따른 효과
김영진,김기완,권오준,유상대 한국센서학회 1996 센서학회지 Vol.5 No.6
ZnO thin films were prepared on glass and (012) sapphire substrates by rf magnetron sputtering. Polycrystalline ZnO films with a (002) orientation were obtained on glass substrates. (110) ZnO films were epitaxially grown on the (012) sapphire substrates. Surface acoustic wave properties were also measured for propagating along the c axis of ZnO film on the glass and sapphire substrates. The phase velocities (V_P) on glass and sapphire substrate at center frequency were 2&80 m/sec and 5980 m/sec and the effective coupling coefficient (k²) on the 0th mode were 0.98 % and 1.43 % respectively.
김두환,한석규,안세희 한국산업안전학회 1998 한국안전학회지 Vol.13 No.4
Welding structures will be occurred sudden crack or failure by reduced fracture toughness in case of low temperature. To protect these unstable fracture is very important. Because fracture of welding part come from welding faults or residual stress, critical stress intensity factors are acquired at temperatures between 22℃ and -70℃ from base metal, welding metal and H.A.Z. It was studied effectiveness of annealing and affection of residual stress under low temperatures. In case of fracture toughness test, it showed that fracture toughness value decreased, according to the decrease of temperature. Expecially In case that compressive residual stress was existed, K_c increased.
양극수소 충전이 Al 8092 합금의 파괴특성에 미치는 영향
김상식,장우길,신광선 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.11
Effects of cathodic hydrogen charging on fracture behavior of Al 8090 alloy were examined as functions of charging time, displacement rate, aging condition, applied potential and specimen orientations. Fatigue precracked SEN(single edge notch) specimens with various orientations were cathodically hydrogen charged in 0.1N HCl solution for 12 to 48 hours at an applied potential of -1800 and -2000mV vs. SCE, respectively. It was found that the cathodic hydrogen charging substantially reduced the initial fracture toughness value, K_(th), of Al 8090, while the reduction in K_(th) value was linearly proportional to (charging time)½. The dominant fracture mode of Al 8090 was intergranular dimpled rupture, and the plasticity around the dimples on the intergranular facets appeared to be reduced with hydrogen charging. The sensitivity to hydrogen assisted fracture of Al 8090 was greatly affected by specimen orientation, applied potential and aging condition. Like other high-strength Al alloys, the resistance to hydrogen assisted fracture was increased with increasing aging time. The reason for the improved resistance with prolonged aging in Al 8090 is believed to be related to the precipitate free zone formed along the grain boundaries.
RIHSA와 131I-Hippuran으로 측정한 심박출량의 비교
김정일,고창순,이안기,길광수,박진영,김동섭 대한핵의학회 1970 핵의학 분자영상 Vol.4 No.2
저자들은 정상성인 남자 11예에서 방사성동위원소인 RIHSA와 (131)^I-Hippuran을 사용하여 체외계측법에 의한 심박출량을 측정하여 다음과 같은 결론을 얻었다. 1) RIHSA를 사용한 심박출량의 측정치는 6750±866ml/min, 심계수의 측정치는 3960±476ml/min./㎡이었다. 2) 131I-Hippuran을 사용한 심박출량의 측정치는 5940±764ml/min, 심계수의 측정치는 3490±396ml/min./㎡이었다. 3) (131)^I-Hippuran에 의한 심박출량의 측정치는 RIHSA를 사용한 심박출량의 측정치의 88%로 나타났으며 양자간의 차이는 통계학적의미를 가지고 있었다(P$lt;0.05). 4) (131)^I-Hippuran을 사용하여 심박출량측정이 가능함을 알 수 있었다. Repeated measurement of cardiac output in the same 11 normal individuals were done with (131)^I-Hippuran and RIHSA. Following results were obtained. 1) The cardiac output measured with RIHSA was 6750±866ml/min. 2) The cardiac output measured with (131)^I-Hippuran was 5940±764ml/min. 3) The relative value of cardiac output measured with (131)^I-Hippuran to that measured with RIHSA was 88 percent, and a statistical significance was found present in the difference.
EPDM/PP/Ionomer 삼원 블렌드로 된 열가소성 가황체의 파괴 인성
김영규,조원제,하창식,고진환 한국고무학회 1996 엘라스토머 및 콤포지트 Vol.31 No.5
The fracture mechanics investigation of the thermoplastic vulcanizates(TPV) from EPDM and PP/Ionomer ternary blends was performed in terms of the J-integral by measuring fracture energy via the locus method. The TPV from ternary blends consisting of EPDM, PP and ionomer were prepared in a laboratory integral mixer by blending and vulcanizing simultaneously. Vulcanization was performed with dicumyl peroxide (DCP) and the composition of EPDM and PP was fixed at 50/50 by weight. Two kinds of polyethylene-co-methacrylic acid)(EMA) Ionomers were used. The J-integral values at crack initiation, Jc, of the dynamically vulcanized EPDM and PP/EMA Ionomer ternary blends were affected by the cavion types (Na^+ or Zn^(2+)) and contents(5-20wt%) of the added EMA Ionomers. The ternary blend containing 20wt% zinc-neutralized EMA ionomer and 1.0phr DCP showed the highest Jc values of the blends.
홍기석,고창순,정준기,이홍규,김삼용,석창호,박성회,김용일 대한핵의학회 1978 핵의학 분자영상 Vol.12 No.2
저자들은 서울대학교 병원 내과에서 108례의 갑상선 침생검을 시행하여 8례(7.9%)의 아급성갑상선염을 진단할 수 있었다. 이를 임상경과, 갑상선기능 등으로 본 임상단계와 비교한 결과 다음과 같은 결론을 얻었다. Czernick 등이 시도하였던 임상단계와 침생검의 조직소견이 비교적 잘 대응하였다. 임상경과가 길거나 갑상선기능이 낮을수록 갑상선의 섬유화가 심하였고 여포성분의 감소를 보였다. 갑상선의 기능상태와 옥소섭취율 혹은 갑상선주사상의 섭취율은 역 상관관계를 보였다. 임상단계의 초기에 발견된 환자들은 기능항진증의 증상을 보였다가 기능저하증의 양상을 보인 후 회복되는 이형적인 경과를 보였다. 임상단게의 후기에 발견된 환자들은 4명중 3명이 기능저하증을 보였는데, 이는 경과로 보아 질환의 최종단계로 생각되었다. $quot; 8 cases of subacute thyroiditis was diagraiosed amormg 108 needle biopsy of the thyroid during the period from April 1976 to August 1978. Correlation of the histologic findings with the clinical staging proposed by Czernick was relatively well matched; cases with long clinical course or low thyroid hormone levels showed greater fibrosis and reduction of follicular elements in thyroid. Thyroid (131)^I uptake or the uptake as seen on the thyroid scanning correlated inversely with the thyroid hormone levels. The clinical course of the patients seen in their initial stage of disease followed the classical pattern; hyperthyroid-like, hypothyroid-like and recovery. 3 among the 4, who were seen in their later clinical course showed hypothyroidism, which seemed the final outcome of their diseases.