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진의봉(U. B. Jin),주영석(Y. S. Joo),김시영(S. Y. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The scale correction was analyzed for model to prototype with roughness effects in the pipe. The flow law of log and law of the wall were used by theoretical analysis to calculate the scale correction with surface roughness effects. For the surface roughness in the pipe flow for marine pipe fittings in boiler, heat exchange and the velocity field in the turbulent boundary layer on the wall is determined by scale for law of log and law of the wall. In this study, the calculation for the variation of diameter for roughness effects with variation velocity was investigated to design the facility of the ship. It was shown that the surface roughness effects in scale effects for model to prototype relation could be applied depending on scale ratio in model to prototype.
진의남(Ieu Nam Jin) 대한공업교육학회 1995 대한공업교육학회지 Vol.20 No.2
The objective of this study is to develop the practice evaluation standard, and to plan the detailed contents in each step of practice evaluation procedure model. To accomplish the above objectives, this study was carried out as following. (1) The tentative solutions were drawn out by collecting, analyzing, and synthesizing the related literature. (2) In order to verify the validity of the tentative solutions, twenty-two experts evaluated the solutions, and finally the researcher reviewed, revised and replenished them by the evaluated results. The tentative solutions by the researcher were asked to twenty-two experts to evaluated them, and twenty (7 professors and 13 teachers) of them had given the response back. The researcher sent the evaluation check list and the summary of study to them by mail. The evaluation check list was proposed to rate according to the degree of validity with Likert scale, five steps, about 9 items. if evaluator had alternatives or better improvements, they could directly describe them in the evaluation sheet. The results to rate with five step-scale were scored as follow : the mean and standard deviation were calculated by the scores. According to the results of the study from the evaluators, means of the hypothetic plan of each domain measures 3.80-4.20. Therefore, we can say that the validity is on high degree. In conclusion, the study synthesized the results from rating the hypothetic plan and the opinion provided with explanatory and other space, keeping the basic framework as it is and then suggestion of establishing the domain of practice evaluation.
진의덕(E. D. Jin),최진승(J. S. Choi),탁계래(G. R. Tack),이봉수(B. S. Lee),이법이(B. Y. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Recently intradiscal electrothermal therapy is introduced, which is a new and minimally invasive technique for the treatment of discogenic low back pain. This procedure involves the percutaneous threading of a flexible catheter into the disc under fluoroscopic guidance. The catheter, composed of thermal resistive coil, heats the posterior annulus of the disc, causing contraction of collagen fibers and destruction of afferent nociceptors. This study tries to investigate the effects of the important factors of this procedure such as heat source temperature and heat applying time on the temperature distribution within the intervertebral disc. This study utilized both computer simulation and the experiment for the verification of finite element analysis. FE analysis was carried out with ANSYS v7.0 (ANSYS Inc, USA) using 10,980 number of brick element and 12,551 number of node. The functional spinal units of 5 month old swine were used for the experiment and the temperature was monitored using 10 channel temperature measurement device MV200. Through this study, it was able to analyze the temperature range of inner intervertebral disc by two mechanisms which are known to alleviate pain clinically. The results showed that when the heat source temperature was kept up 80 degree for 1,020 seconds, the temperature of inner annulus reached at 45 degree up to the distance of 15.6㎜ from heat source, which explains coagulation of inner annulus by heat. When the same heat source was used, the temperature of inner nucleus reached at 60 degree up to the distance of 9㎜ from heat source, which explains contraction of inner nucleus by heat.
진의,김영순,Jin, Eui,Kim, Young Soon 대한화학회 1998 대한화학회지 Vol.42 No.6
By using the spray pyrolysis method, zinc oxide(ZnO) was produced from zinc acetate, the surface morphology of the prepared films was investigated by using scanning electron microscopy. The thickness of ZnO thin film was increased up to 460$^{\circ}C$ and it was 833 nm. The maximum wavelength of absorption was obtained at 365 nm, and the maximum peak of fluorescence at 475 nm and 505 nm. ZnO film have been characterized by XPS, XRD, and SEM. XRD results show that all the films are preferred orientation along the (002) plane which is depend on the substrate temperature. The optimal temperature to produce ZnO was determined at around 460$^{\circ}C$ from measurements of XPS, XRD and photocurrent. It was also shown that the homogeneous particles had the higher photocurrent. 아세트산아연으로부터 ITO유리전극위에 열분무법을 이용한 산화아연의 박막을 만들고, 박막 표면의 형태는 SEM으로 조사하였다. 산화아연 박막의 두께는 온도를 증가시키면 약 833 nm까지 증가하다가, 480$^{\circ}C$ 부터는 오히려 감소하는 경향을 나타내었다. 분광 흡광도는 365 nm에서 관측되었고 형광 특성은 475 nm, 505 nm에서 최대의 세기를 나타내었다. 산화아연의 생성은 X선 광전자 분광 스펙트럼으로 확인하였으며, X선 회절 무늬로부터 (002) 면이 기질온도에 따라 우세한 방향으로 성장함을 알 수 있었다. 산화아연의 합성 최적의 온도는 X선 회절 무늬와 광전류의 측정값으로부터 460$^{\circ}C$ 부근임을 확인하였다. 또한 산화아연의 입자의 크기가 균일할수록 광전류가 증가함을 알 수 있있다.
진의,김영순,후지시마 아키라,Jin, E.,Kim, Y.S.,Fujishima, Akira 대한화학회 1998 대한화학회지 Vol.42 No.1
Titanium dioxide $(TiO_2)$ thin film samples were prepared by using spray pyrolysis methodology and were by using X-ray photoelectron spectroscopy and X-ray diffraction analysis. It was found that anatase prepared by the hydrolysis of titanium(Ⅳ) oxyacetylacetonate exhibited the largest specific surface area. The particle size increased with increasing temperature, while the thickness decreased. Titanium dioxide $(TiO_2)$ in the anatase form was prepared at $400^{\circ}C$ and the photoconductivity was determined using photocurrent measurements. Photoelectrochemical properties of the $TiO_2$-phthalocyanine system were measured in a three-electrode system. The photocurrent action spectrum in the visible region coincided with intrinsic absorption spectrum of phthalocyanine. The crystal structure of phthalocyanine is considered to be a very important property in the photogeneration phenomena. 산화티탄을 전극 재료로 사용하기 위해서는 투명하고 수용액에 안정한 재료가 필요하다.아세틸 아세톤 티탄(IV)으로부터 분사방법을 이용하여 산화티탄의 안정한 박막을 얻었다. 결정 모양은 구형을 나타내었으며, 결정의 크기는 온도가 증가함에 따라 증가하였고 두께는 감소하는 경향을 나타내었다. XRD 데이타로부터 아나타제 결정이 400$^{\circ}C$ 에서부터 얻어지기 시작함을 관찰하였다. 440$^{\circ}C$ 에서 만들어진 산화티탄이 고유 광전류가 최대값을 나타냈으며 가시광 영역에서 광전류가 증가하는 결과를 나타냈다. 가시광 영역에서의 광전류는 프탈로시아닌의 흡수 스펙트럼과 같은 ${\lambda}$max 위치에서 얻어졌고 이와 같은 결과는 프탈로시아닌의 결정 특성에 따른 광전류 특성으로 나타났다.