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Novel K/Ka Bandpass Filters using LIGA Micromachined Process
Park, K. Y.,Park, J. Y.,Choi, H. K.,Lee, J.C.,Lee, B.,Kim, J. H.,Kim, N. Y.,Park, J. Y.,Kim, G. H.,Kim, D. W.,Bu, J. U.,Chung, K. W. The Korean Institute of Electromagnetic Engineerin 2000 한국전자파학회논문지 Vol.11 No.6
New class of three dimensional (3-D) micromachined microwave planar filters at K and Ka-band are presented using LIGA micro-machined process. The K-and Ka-band filters show wide bandpass characteristics of~36% and ~39% with the insertion loss 1.26dB at 19.11GHz and 1.7dB at GHz, respectively. These filters can be applicable in high power MMIC of MIMIC.
오리피스형 분사노즐에서 작동유체의 온도변화에 따른 K-factor에 관한 연구
배강영(K. Y. Bae),김찬희(C. H. Kim),정희택(H. T. Chung),김형범(H. B. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In the present study, the numerical simulation has been performed to investigate K-factor for temperature variation of working fluid in spray nozzle with orifice. The commercial CFD software, Fluent with the proper modeling was applied for analyzing the internal of the spray nozzle. Numerical result for K -factor at 20℃ agrees with the experimental result that it applied n=0.5 within about 7% error. The pressure drop inside nozzle is showed 20% passing swirler, 70% in the region between the outlet of swirler and the orifice and 10% at the outlet of orifice. As the operating pressure is increased, K -factor is decreased by effect of flow resistance at the inlet of swirIer passing it. The temperature increase of working fluid reduced the flow rate according to reducing of density, and average 1.23% decrease is showed in the present research.
PCR - RFLP 기법을 이용해 젖소개량을 위한 유전적 표지로서 K- Casein 좌위의 유전자형 분석
정의룡(E . R . Chung),김우태(W . T . Kim),최석호(S . H . Choi),임태진(T . J . Rhim),한상기(S . K . Han) 한국축산학회 1995 한국축산학회지 Vol.37 No.1
Genotypes of K-casein(K-CN) locus as a genetic marker linked to quantitative trait loci affecting traits of economic importance in dairy cattle were determined by PCR-RFLP method. Genomic DNA was prepared from blood of Holstein cows. The PCR was used to amplify an 874 by region between nucleotides 10592 and 11466 from exon IV to intron IV of the bovine K-CN gene using sense primer(5`-GTGCTGAGTAGGTATCCTAG-3`) and antisense primer(5`GTAGAGTGCAACAACACTGG-3`). After amplification, PCR products were digested with four restriction enzymes, Hind III, Rsa I, Taq I, and Pst I, and the fragments were separated by agarose gel electrophoresis for RFLP analysis of K-CN locus. In addition to screening for the known Hind III and Rsa I restriction site polymorphisms of K-CN locus, we have found additional RFLPs specific for the K-CN A and B alleles in Taca I and Pst I enzymes. The amplified DNA product digested with each restriction enzyme generated specific RFLP pattern that allowed precise identification of K-CN AA, BB or AB genotypes. The K-CN genotypes determined for cows by the PCR-RFLP method agreed completely with the phenotypes obtained from milk samples of the same individuals. Thus, PCR amplification and RFLP analysis was shown to be a rapid and sensitive method for the discrimination of K-CN genotypes directly at the DNA level in dairy cattle of any age or sex. Consequently, the PCR-RFLP method presented in this study can be used as a valuable tool for early selection of AI bulls and calves with desirable K-CN B gene or K-CN BB genotype affecting superior milk production traits for genetic improvement of Holstein dairy cattle.
한우와 샤로례 교잡종 미경산빈우에 있어서 발정기와 임신초기의 혈중호르몬수준 및 체중변화에 관한 연구
정영채,김창근,이근상 한국축산학회 1984 한국축산학회지 Vol.26 No.6
In order to study the changes in serum hormone levels and serum metabolite contents during day 2 before and after estrus and early pregnancy, jugular blood samples were taken from 8 cycling heifers, 4 Korean native cows (K×K) and 4 Charolais crossbreds (C×K). Their average body weight at 1st mating after puberty was 325.8 Kg for purebreds and 416.0 Kg for crossbreds. The live body weights of heifers were measured at monthly intervals from 3 months before 1 st mating to 5 months after mating. Eight heifers were divided into 2 groups according to breed. Serum hormones were assayed by radioimmuhoassay method and serum metabolite contents were analyzed by rapid blood analyser system. The results obtained were as follows: 1. Serum progesterone levels from day-2 to +2 estrus were 0.5-0.9 ng/㎖ for purebreds and 0.6-1.8 ng/㎖ for crossbreds and during the period day 20 to day 60 pregnancy their levels were 7.8-9.1 ng/㎖ for purebreds and 7.7-10.2 ng/㎖ for crossbreds, respectively. There were no significant differences in their levels between 2 breeds, but crossbreds exhibited larger variation among individuals than purebreds. 2. The maximum level of estradiol -17β was 16.9pg/㎖ fer purebreds and 18.4pg/㎖ for crossbreds at day 1 before estrus. These levels decreased at day 2 after estrus. Estradiol -17β levels during 60 days of pregnancy were 7.4-10.1 pg/㎖ for purebreds and 7.0-8.2 pg/㎖ for crossbreds. 3. Serum LH and FSH levels during day 2 before and after estrus and early pregnancy remained below 1.56mIU/ ㎖ and 1.25mIU/㎖ at all the investigated stages, respectively. 4. Serum prolactin levels were highest at the day of estrus in 2 breeds and the maximum level in purebreds and crossbreds were 13.2 ng/㎖ and 13.6ng/㎖, respectively. The stages of elevated serum prolactin level occurred later I days than those of estradiol -17β. Serum prolactin levels during the early pregnancy were 8-11ng/㎖ in 2 breeds and these levels were similar to those of day 2 after estrus. 5. In changes of live body weight during 5 months after mating, the body weight at 5 months of pregnancy increased by 9.1% for purebreds and 10.5% for crossbreds. The weights of crossbreds from 3 months before mating through 5 months of pregnancy were 23-25%~ heavier than those of purebreds. 6. Serum total protein levels during day 2 before and after estrus and early pregnancy were 6.0-6.5 g/㎗ and 5.9-7.0 g/㎗ for purebreds and 7.0-8.8 g/㎗ and 7.0-8.2g/㎗ for crossbreds. There were no significant differences in total protein concentration between 2 breeds and 2 physiological states, although total protein levels of crossbreds were 18-20% higher than those of purebreds. Globulin (G) level in total serum protein was higher than that of albumin (A) at day 2 before estrus and A/G ratio from day 1 before estrus to day 60 of pregnancy ranged 1.08 to 1.16. 7. Serum glucose levels were 43.0 ㎎/㎗ for purebreds and 44.8㎎/㎗ for crossbreds during before and after estrus, and 36.2㎎/㎗ for purebreds and 41.9㎎/㎗ for crossbreds during early pregnancy. Serum GOT levels of purebreds from day 2 before estrus through day 60 of pregnancy were higher than those of crossbreds, but there were not significant between 2 breeds.
연속파 레이저 스페클 寫眞法과 畵像處理에 의한 面內變位 測定에 관한 硏究
김충원,정낙규,나기대,김경석,김택현 한국비파괴검사학회 1990 한국비파괴검사학회지 Vol.10 No.1
This paper presents experimental results which explore the capability of a CW laser speckle photography for the measurement of in -plane displacement at high temperature. The serious restrictions on the application of the method seem to be the ambient air turbulence and the change of surface texture caused by the oxidation, as they tend to decorrelate the double exposured speckle patterns. In order to assess only the effect of air turbulence, a ceramics-coated stainless steel plate is heated in air and Ar-laser specklegrams are made with combination of temperature and lateral translation displacement. The slight reduction in visibility of Young's fringes i observed at 1000˚C. The analyses of Young's fringes are carried out by a image processing system using a TV-camera and computers, and the result agrees well with the micrometer reading. Futhermore, uncoated stainless steel and Hastelloy X plates are tested and the effect of oxidation is also evaluated. The experimental results demonstrate that a CW laser speckle photography is applicable at temperatures up to 1000˚C.
정길생,김정익,김종배,정병현,이훈택,정형민 건국대학교 동물자원연구센터 2001 動物資源硏究誌 Vol.17 No.-
These experiments were carried out to apply the embryo manipulation technique, embryo bisection and blastomere separation, to animal industry. Bovine embryos were prepared through the in vitro maturation, fertilization, and development of follicular oocytes obtained from ovaries of slaughtered cow. The results obtained were summarized as follows: 1) Total 385 demi-embryos were produced from embryos by bisection and 90.4% of them were morphologically normal. 2) The viabilities of demi-embryos with or without zona pellucida in culture were 75.4~84.6% or 57.1~66.0%, respectively. 3) The developmental rates its demi-embryos of morulae or blastocysts were 77.6% and 68.2%, respectively. 4) After removing zona pellucida by pronase treatment, the rates of blastomere separation from 2-, 4-, and 8-cell stage embryos were 91.0, 75.8, and 63.2% respectively. After removing zona pellucida by micromanipulation, the rates of those were 81.5, 77.4, and 56.3%, respectively, showing the lower than those of pronase treatment. In addition, the better ratio were found in the ealier stage of embryos. 5) The developmental rate of blastomere to morula or blastocyst stage were 60.9~61.3% in 1/2 blastomeres, 57.1~59.3% in 1/4 blastomeres, and 41.7~50.7% in 2/8 blastomeres, showing the better rates in the earlier stage blastomeres. 6) After incubating 1/2, 1/4, and 2/8 blastomeres in ovine oviduct for 3~3.5 days, the recovery rates were 58.8, 58.5, and 29.6%, respectively, and the developmental rates to the morulae or blastocyst stage were 65.0, 58.3, and 37.5%, respectively.