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高周波 大電力을 얻기 위해 DC를 AC로 變換하는 T.R. inverter의 應用
崔鳳煥 慶北工業專門大學 1970 論文集 Vol.7 No.-
This article describes a transistorized inverter circuit primarily designed to be used in conjunction with piezoelectric transducer for ultrasonic cleaning. The advantage of the circuit is the comparatively low switching loss and favourable collector load line during switching which eliminates the risk of secondary break down in power transistors when switching high power at high frequency.
Tunnel Diode 를 利用한 Delta 變調方式의 簡易化에 關한 硏究
崔鳳煥 慶北工業專門大學 1980 論文集 Vol.17 No.-
Delta modulation is an attractive method of analoge to digital conversion in applications where simple and economical designs must be realized without sacrificing conversion quality. This unit consists of a Goto pair and double integrator which can provide a digital communication channel with the SNR of 70 dB under sampling frequency. This paper reports the designing details circuit construction and results of the series of tests conducted on the developped unit.
崔鳳煥 慶北工業專門大學 1977 論文集 Vol.14 No.-
The auther has developped a relatively simple DM codec unit suitable for the field telephone system. The unit consisting from a Goto pair and a single integrator as the coder while a monostable multivibrator as the decoder was proved to be simple yet reliable DM codec, which can provide a digital communication channel with the SNR of dB under various sampling frequencies. In this paper, the auther reports the designing details, circuit construction and the result of the series of tests conducted on the developped unit.
돼지 H-FABP 유전자의 다형성 및 경제 형질과의 연관성 구명
최봉환,김태헌,이지웅,조용민,이혜영,조병욱,정일정 한국동물자원과학회 2003 한국축산학회지 Vol.45 No.5
The purpose of this study was to detect association between genetic variation and economic trait in the porcine heart type fatty acid-binding protein gene as a candidate gene for the traits related with growth and meat quality in pigs. The H-FABP is a 15-kDa protein expressed in several tissues with high demand for fat metabolism such as cardiac and skeletal muscle and lactating mammary gland. H-FABP is small intracellular protein involved in fatty acid transport from the plasma membrane to the site of β-oxidation and/or triacylglycerol or phospholipid synthesis. In this study, H-FABP PCR-RFLP was performed in F_(2) population composed of 214 individuals form an intercross between Korean Native Boars and Landrace sows. PCR products form tow primer sets within H-FABP gene were amplified in 850bp and 700bp. Digestion of PCR products with the restriction digestion enzymes HaeⅢ and Hinf Ⅰ, revealed fragment length polymorphisms(RFL. Ps). The genotype frequencies from H-FABP/HaeⅢ was .29 for genotype DD, .53 for genotype Dd, and .15 for genotype dd, respectively. The genotype frequencies of HH, Hh, and hh from H-FABP(hinf Ⅰ was .38, .41, and .20, respectively, in the population.Relationships between their genotypes and economic traits were estimated. In H-FABP/HaeⅢ locus, there were specific genotypes(Dd and dd) associated with economic traits such as body weight. In H-FABP/Hinf Ⅰ Iocus, Genotypes of HH and Hh associated with growth traits such as body weights at 5, 12, and 30 week of age (p<.05 or p<.001) and back fat thickness, body fat including abdominal and trimmed fat (p<.001) and intramuscular fat(p<.05). The 'H'allele was positivecly associated with gaining of body weight and fatness deposition. In conclusion, a significant association of the H-FABP gene from its genetic variation was found on body weight, intramuscular fat and backfat thickness.
崔鳳煥 慶北工業專門大學 1974 論文集 Vol.11 No.-
Study on noise characteristic of high frequency elements, noise and noise flgure of transistor and input impedance. Which in clude internal noises of electronics circuits.
돼지 leptin receptor내 초위성체 다형성과 경제형질과의 연관성 구명
최봉환,김태헌,조용민,이혜영,전진태,정일정 한국동물자원과학회 2003 한국축산학회지 Vol.45 No.5
The leptin receptor gene(LEPR) produces a high affinity receptor that mediates the regulation of the leptin gene. Leptin secreted from adipose tissue plays an important role in regulating feed intake and energy balance. In this study, a microsatellite marker within LEPR was selected and genotyped for the F_92) population composed of 354 individuals from an intercross between Korean Native boars and Landrace sows. Totally, six alleles (255,259, 261, 263, 265 and 267bp) and nineteen genotypes were detected in the population, of which the CE (261/265), CC (261/261) and EE (265/265) types were observed by 20.0%, 10.1% and 9.6% respectively. Relationships between their genotypes and economic traits were analyzed. We found specific genotypes associated with economic traits such as body weight at 12 weeks of age/body fat including abdominal and trimmed fat/shear force (p<0.001), body weight of 30 weeks of age (P<0.01) and body weight of 3 weeks of age/back fat thickness (P<0.05). The DD (263/263) and DF (263/267) types were associated with body weight at 3, 5, 12 and 30 weeks of age. The DF (263/267) type showed a highly singificant effect on back fat thickness and body fat including abdominal and trimmed fat. The DF (263/267) type showed positive effect on shear force, whereas the BB (259/259) and DD (263/263) types negatively affected on tenderness.