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회전자형 위치센서를 갖는 스위치드 릴럭턴스 전동기의 속도 제어
최규하,최기원,장도현 건국대학교 1996 學術誌 Vol.40 No.2
This paper describes the practical implementation of switched reluctance motor drive for a wide range of operation speeds. Turn-on/off angle of phase switches and magnitude of current depend upon the speed and load variations. The angle controller is designed with one-chip microprocessor 8051 for various real time applications. Turn-on/off angle is controlled by timer/counter mode 2 of 8051. Position sensor for SRM drive consists of the rotor shaped slot-disc and opto-interrupter. Algorithm to control the speed of SRM with rotor type position sensor and to maintain the speed under the changed load is proposed. Experiments are executed to verify the proposed algorithm.
인버터 구동 유도전동기의 가창소음 저감을 위한 새로운 펄스폭 변조기법
최규하,신우석,함연창 建國大學校 附設 産業技術硏究所 1992 논문집 Vol.17 No.-
The PWM inverter system are widely used to control the induction motor, and their switching frequency rises to the higher for better performances. But the upper should be limited for safe operation as well as switching loss reduction in the power transistor inverters. This makes the level of the audible noise much increased. In order to overcome such noise problem, a new PWM control technique is proposed in the power transistor inverters, of which carrier frequency is to change a according to the slope of the sine wave reference signal. As a result the frequency spectra are improved and hence the audible noise couble be reduced greatly.
Choe, Chang-Yong,Kim, Jung-Gon,Cho, Sang-Rae,Son, Dong-Soo,Kim, Young-Keun,Balasubramanian, S,Choe, Sang-Yong,Rho, Gyu-Jin Blackwell Verlag GmbH 2006 Reproduction in domestic animals Vol.41 No.1
<P>Contents</P><P>The success of AI technology is based on both semen quality and freezing process. In order to establish the semen freezing techniques in Korean native bucks, factors affecting the success were evaluated in the present study. Semen collected by electro-ejaculation from bucks during four distinct seasons was evaluated for semen volume and pH, sperm motility and survivability. The semen volume, concentration and total cell were higher in spring, summer and less in winter. Yet, there were no seasonal differences in the proportional data of live sperm, motility score and pH of semen among seasons. The percentage of live sperm after thawing was found to increase with increased concentration of lactose in Tris-Egg yolk-glycerol (TY-G), being highest in TY-G supplemented with 180 m<SMALL>M</SMALL> lactose (TYL180-G), but did not differ between TY-G and TYL120-G. Sperm motility was enhanced by employing 2.0 h equilibration time with rapid freezing method. In conclusion, semen could be frozen with high success rates for further use of AI in breeding techniques and to preserve the Korean native bucks.</P>
만성 간질환 환자에서 간섬유화의 정도와 혈청 히알루론산치를 이용한 간섬유화의 예측
김창욱 ( Kim Chang Ug ),윤승규 ( Yun Seung Gyu ),조병식 ( Jo Byeong Sig ),신주엽 ( Sin Ju Yeob ),장정원 ( Jang Jeong Won ),최종영 ( Choe Jong Yeong ),한남익 ( Han Nam Ig ),이창돈 ( Lee Chang Don ),정규원 ( Jeong Gyu Won ),선희식 ( 대한소화기학회 2003 대한소화기학회지 Vol.42 No.6
Backgrounds/Aims: The extent of hepatic fibrosis is important in chronic liver disease. Liver biopsy is essential for diagnosis of fibrosis. However, biopsy is invasive and may not represent the whole liver state. Serum hyaluronic acid (HA), a major component of connective tissues, was introduced as a useful non-invasive index of hepatic fibrosis. The aim of this study was to evaluate the relationship among HA, the degree of fibrosis, several hematologic and biochemical parameters in patients with chronic liver diseases or post state liver transplantation (PSLT). Methods: Total 102 cases were divided into 4 groups: 57 chronic hepatitis (CH), 12 cirrhosis, 21 hepatocellular carcinoma (HCC), 12 PSLT. HA was measured by enzyme-linked binding protein assay and evaluated in relation the degree of fibrosis, several hematologic and biochemical parameters. Results: Among four groups, HCC showed the highest HA and HA of HCC significantly higher than that of CH. The degree of fibrosis were correlated with HA. HA was correlated with age, platelet count and albumin but, not with ALT and PT. There is no significant relation between HA and the presence of acute rejection in liver transplantation. Conclusions: In chronic liver diseases, HA is a useful non-invasive index of hepatic fibrosis and disease severity. (Korean J Gastroenterol 2003;42:510-518)
Proteomic Analysis of Differentially Expressed Proteins in Bovine Endometrium with Endometritis
Choe, Chang-Yong,Park, Jeong-Won,Kim, Eun-Suk,Lee, Sung-Gyu,Park, Sun-Young,Lee, Jeong-Soon,Cho, Myung-Je,Kang, Kee-Ryeon,Han, Jae-Hee,Kang, Da-Won The Korean Society of Pharmacology 2010 The Korean Journal of Physiology & Pharmacology Vol.14 No.4
Endometritis is one of the primary reasons for reproductive failure. In order to investigate endometritis-associated marker proteins, proteomic analysis was performed on bovine endometrium with endometritis. In bovine endometritis, desmin, $\alpha$-actin-2, heat-shock protein (HSP) 27, peroxiredoxin-6, luteinizing hormone receptor isoform 1, collectin-43 precursor, deoxyribonuclease-I (DNase-I), and MHC class I heavy chain (MHC-Ih) were up-regulated. In contrast, transferrin, interleukin-2 precursor, hemoglobin $\beta$ subunit, and potassium channel tetramerisation domaincontaining 11 (KCTD11) were down-regulated in comparison to normal endometrium. The proteomic results were validated by semiquantitative-PCR and immunoblot analysis. The mRNA levels of desmin, transferrin, $\alpha$-actin-2, HSP27, KCTD11, and MHC-Ih were up-regulated by over 1.5-fold, and showed a pattern similar to their proteomic profiles. Desmin and $\alpha$-actin-2 protein showed positive correlations between proteomic analysis and immunoblot analysis. These results suggest that desmin and $\alpha$-actin-2 may play important roles in endometritis-related function, and could be useful markers for the diagnosis of bovine endometritis.