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서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)
김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.
차병열(Byung Yul Cha),홍병규(Byung Que Hong),조현수(Hyun Su Jo),손호선(Haw Son Sohn),박영철(Yeong Chyll Park),양원석(Won Seok Yang),최옥인(Ok In Choi) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.1
Stomach contents of 518 specimens of the yellow goosefish, Lophius litulon caught by the off-shore stownet in the southern waters of Korea were examined by means of the calculation of the frequency of occurrence, number and weight percentages, and index of relative importance (IRI) in each prey organisms. Prey organisms of the yellow goosefish consist of fishes, crustaceans, cephalopods. Fishes were dominant prey group, and occupied 98.8% in IRI of prey organisms. Four species of fish, Pseudosciaena manchurica, Collichthys niveatus, Engraulis japonica, Trichiurus lepturus were dominant as to the IRI and occupied 87.2% of the total IRI. P. manchurica was a dominant prey organism in predator`s stomach through the year, and the other dominant prey organisms occurred intermittently with seasonal progress. P. manchurica was a dominant prey organism to all fish size, too. C. niveatus and E. japonica decreased in importance in the diet as the fish size increased, concomitant with an increase in importance of T. lepturus. Mean species number and mean individual number of prey organisms increased with the fish size.
Expression of Placenta-Related Genes (Cdx2 and GATA6) in Cloned Porcine Development
Cha, Byung-Hyun,Hwang, Seong-Soo,Lee, Hwi-Cheul,Park, Mi-Rung,Im, Gi-Sun,Woo, Jae-Seok,Park, Soo-Bong,Cho, Jae-Hyeon,Ko, Yeoung-Gyu The Korean Society of Animal Reproduction 2009 Reproductive & developmental biology Vol.33 No.4
Abnormal development and fetal loss during the post-implantation period are key concerns in the production of cloned animals by somatic cell nuclear transfer (SCNT). We hypothesized that the problems in cloned porcine offspring derived from SCNT are related to interactions between the conceptus and the endometrial environment. In the present study, we investigated expression patterns in the formation of placenta-related genes (Cdx2 and GATA6) in whole in vivo normal porcine embryos (from single cell to blastocyst) and each tissue of a normal fetus at Days 25, 35 and 55 by quantitative mRNA expression analysis using real-time PCR. The expression of Cdx2 and GATA6 mRNA increased to around the blastocyst stage. These genes were gradually decreased from the peri-implantation to post-implantation stage. Moreover, we examined the expression patterns of Cdx2 and GATA6 in Day 35 normal and SCNT cloned fetuses by the same methods. And, the level of Cdx2 and GATA6 gene expression in the extraembryonic tissue of SCNT was significantly higher than that of control tissues. From the present results, it can be postulated that the aberrant expression of Cdx2 and GATA6 genes in the endometrial and extraembryonic tissues at pre- and peri-implantation stages may be closely related to the lower efficiency of animal cloning.
A Design of Guard Lamp Using Solar Cell
Byung-Bog Kang,In-Su Cha,Seok-Jong Kim,Yong-Hoon Sim 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
A guard lamp system has been installed at the PV positive center, located at Gwangju in Korea. Digital environment that is represented to internet is displacing business way of industry and business achievement way with the fast speed being giving great change on life whole, improve existence business process utilizing internet and Web connection technology, information superhighway to tradition industrialist manufacture and e-transformation's propulsion that wish to maximize productivity and administration efficiency is spread vigorously. In this paper, we wish to accomplish generation equipment's heighten stability and believability through remote monitoring and control of guard lamp system. This paper describes the design of the monitoring system for the sensing data and indirect controlling of the guard lamp system. Most of the conventional monitoring systems depend on the special hardware and software. The essential design of monitoring system is to provide the convenience for the user and the portabilit for the system. In order for the system to fulfill its requirements, it was designed using Labview GUI facility based on the Windows 2000 environment of IBM PC compatible and Add-on card based on the TCP/IP protocol. Advantage of the monitoring system are a personnel expenses curtailment effect, free of the place restriction and unmanned system of the generation plants, etc..
Seok-Eon Joung,Byung-Gun Park,Dong-Seok Hyun,In-Ho Cha 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
this paper proposes an improved synchronization control scheme of a low cost 400㎐ power supply for No-Break Power Transfer. In the case of Aircraft application, the 400㎐ power supply called as ground power units (GPU) has been accepted as external electrical power system during stopovers in ground. When transferring from one power source to the other, there is a momentary break in supply. To transfer without a break, the two power sources are momentarily connected in parallel. The proposed synchronization control is achieved by connecting an existing synchronization bus to a voltage zero-crossing signal of a generator power with discrete logic ICs and analog circuits. Therefore, this proposed control scheme is rather simple and the cost may be decreased, compared with expensive controller such as DSP and CAN. The practical feasibility of the proposed control scheme is proved by simulation.
A Comparative Study of Two Different SnO<sub>2</sub>:F-coated Glass Substrates for CdTe Solar Cells
Cha, Eun Seok,Ko, Young Min,Choi, Yong Woo,Park, Gyu Chan,Ahn, Byung Tae Korea Photovoltaic Society 2017 Current Photovoltaic Research Vol.5 No.1
Two different fluorine-doped tin oxide (FTO)-coated glass substrates were investigated to find better suitability for CdTe solar cells. Substrate A consisted of FTO (300 nm)/$SiO_2$ (24 nm)/intrinsic $SnO_2$ (30 nm)/borosilicate glass (2.2 mm), and substrate B consisted of FTO (700 nm)/intrinsic $SnO_2$ (30nm)/borosilicate glass (1.8 mm). The overall thickness of the FTO/glass substrates was about 2.5 mm. The total light transmittance of substrate B was much higher than that of substrate A throughout the whole spectral region, even though the thickness of the FTO in substrate B was twice larger than that of the FTO in the substrate A. The short-circuit current greatly increased in substrate B and the external quantum efficiency (EQE) increased over the whole wavelength range. This study shows that the diffuse optical transmittance played a key role in the large EQE value in the blue wavelength region, and the direct transmittance played a key role in the large EQE value in the red wavelength region. The higher transmittance is due to the rough surface generated by the thicker FTO on glass. The conversion efficiency of the CdTe solar cell increased from 12.4 to 15.1% in combination of rough FTO substrate and Cu solution back contact.
Imprinted Gene mRNA Expression during Porcine Peri-implantation Development
Cha, Byung-Hyun,Kim, Bong-Ki,Hwang, Seongsoo,Yang, Byoung-Chul,Im, Gi-Sun,Park, Mi-Rung,Woo, Jae-Seok,Kim, Myung-Jick,Seong, Hwan-Hoo,Cho, Jae-Hyeon,Ko, Yeoung-Gyu Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.6
Imprinted genes are essential for fetal development, growth regulation, and postnatal behavior. However, little is known about imprinted genes in livestock. We hypothesized that certain putatively imprinted genes affected normal peri-implantation development such as embryo elongation, initial placental development, and preparation of implantation. The objective of the present study was to investigate the mRNA expression patterns of several putatively imprinted genes during the porcine peri-implantation stages from day 6 to day 21 of gestation. Imprinted genes were selected both maternally (Dlk1, IGF2, Ndn, and Sgce) and paternally (IGF2r, H19, Gnas and Xist). Here, we report that the maternally imprinted gene IGF2 was expressed from day 6 (Blastocyst stage), but Dlk1, Ndn, and Sgce were not expressed in this stage. These genes were first expressed between days 12 and day 14. All the maternally imprinted genes studied showed significantly high expression patterns from day 18 of embryo development. In contrast, paternally imprinted genes IGF2r, H19, Gnas, and Xist were first expressed from day 6 of embryo development (BL). Our data demonstrated that the expression of H19 and Gnas genes was significantly increased from day 14 of the embryo developmental stage, while IGF2r and Xist only showed high expression after day 21. This study is the first to show that the putatively imprinted genes were stage-specific during porcine embryonic development. These results demonstrate that the genes studied may exert important effects on embryo implantation and fetal development.