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무선통신용 LTCC 다층기판의 수동소자 라이브러리 구현
조학래,구경헌 한국항행학회 2019 韓國航行學會論文誌 Vol.23 No.2
This paper has designed, fabricated, and analyzed the passive devices realized using low temperature co-fired ceramic (LTCC) multi layer substrates by dividing into the shrinkage process and the non-shrinkage process. Using two types of ceramic materials with dielectric constant 7 or 40, we have fabricated the same shape of various elements in 2 different processes and compared the characteristics. For the substrate of dielctric constant 40, compared with the shrinkage process which has 17% shrink in the X and Y directions with 36% shrink in the Z direction, the non-shrinkage process has 43% shrink in the Z direction without shrink in the X and Y directions, so high dimensional accuracy and surface flatness can be obtained. The inductances and capacitances of the fabricated elements are estimated from measurement using empirical analysis equations of parameters and implemented as a design library. Depending on the substrate and the process, the inductance and capacitance depending on the turn number of winding and unit area have been measured, and empirical polynomials are proposed to predict element values. 본 논문에서는 LTCC 다층기판으로 구현할 수동 소자를 수축공정과 무수축공정으로 구분하여 설계, 제작하고 분석하였다. 유전율 7 또는 40의 두 종류 세라믹 소재를 사용하여 기본 형태의 수동소자를 다양하게 두 가지 공정으로 제작하여 특성을 비교하였다. 유전율 40 기판을 사용할 때 수축공정은 X, Y 방향에서 17%, Z 방향에서 36%의 수축율을 보이는 것과 비교하여, 무수축공정은 X,Y 방향에서 변화하지 않고 Z 방향으로만 43% 수축하여 평면상에서 높은 치수 정밀도와 표면 평탄도를 얻을 수 있다. 측정값으로 부터 매개 변수를 이용한 경험적 해석 식을 이용하여 제작한 LTCC 소자의 인덕턴스 및 커패시턴스를 추정하였으며 설계 라이브러리 형태로 구현하였다. 유전율과 제작 공정에 따라 인덕터의 권선수와 단위 면적에 따른 커패시턴스를 측정하여 권선수 및 단위면적에 따른 소자값을 예측할 수 있는 다항식을 제시하였다.
조학래 서울産業大學校 1997 논문집 Vol.45 No.1
Engineers are different from scientists. Few researcher recognize this difference, and the failure to distinguish scientists and engineers would create confusion in the literature and over the applicability of research results to specific real life situations. In this article, the literature studying the behavior of scientists and engineers are reviewed, and suggested that engineers differ from scientists in their professional activity, their attitudes, and their orientations, and even in their personality characteristics. The results of this review would be the foundations for empirical study about value orientations of R & D personnel in Korean situation
조학래,신진한 동의공업대학 1999 論文集 Vol.25 No.1
Developing for the carrot vinegar, the carbohydrate of carrot was hydrolyzed with the hydrolyzing enzymes such as Termamyl, Dextrozyme and Viscozyme using for the substrates of alcohol and acetic acid fermentation. For retaining the native color and flavour of carrot in the final vinegar product, minimal heat treatment of crushed carrot was introduced, In the course of pasteurization treatment of crushed carrot for 30minutes at 70℃, Termamyl was added to it for the enzymatic hydrolysis reaction. After that, the temperature of the crushed carrot solution was reduced to the optimum temperature of each hydrolyzing enzymes, step by step. The temperature of carrot solution was reached to 60℃. Dextrozyme was added and maintained for 1 hour at the temperature. Then Viscozyme was added and remained for 1hour at 45℃. After the enzymatic hydrolysis reaction, the reducing sugar concentration 7.0% of crushed carrot was acquired. The carrot hydrolysate was adjusted reducing sugar concentration to 20.0% by adding Dextrose. In ethanol fermentation of the carrot hydrolysate, sterilization of the carrot hydrolysate could be omitted by inoculation of large amount of the seed culture of Sacchromyces cerevisiae to the hydrolysate, as the initial viable cell count of ferment was 10^(8)/ml and initial ethanol concentration was 1.0%. The ethanol concentration of the hydrolysate was reached to 11.0% by cultured for 7days at 30℃. The carrot hydrolysate adjusted to ethanol concentration 6.0% with water was inoculated with Acetobacter aceti and cultured statically for 30days at 30℃. The maximum acidity 6.8% of the solution was acquired.
趙鶴來 서울産業大學校 1991 논문집 Vol.34 No.1
This paper brings together results of a number of studies of communication in R & D organizations. These studies show the relationships of communication patterns, project work characteristics, and technical performance, and emphasize the importance of getekeeper in R & D communication. The results presented here should form the basis for further study for R & D organizations in our country.