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Seroepidemiology of HBV Infection in South Korea , 1995 through 1999
(Myoung Kuk Jang),(Ja Young Lee),(Jin Heon Lee),(Yong Bum Kim),(Hak Yang Kim),(Myung Seok Lee),(Choong Kee Park),(Jae Young Yoo) 대한내과학회 2001 The Korean Journal of Internal Medicine Vol.16 No.3
N/A Background: We analyzed serologic data that were obtained from the Korea Association of Health from 1995 to 1999 to estimate the reliable prevalence of HBV in South Korea. Methods: 603, 375, 639, 465, 621, 476, 612, 705 and 650, 398 serum samples were annually tested for HBsAg. Of HBsAg positive persons whose serum samples were available, HBeAg positivity was checked. Results: HBsAg positivities among subjects between 6 and 19 years old were 8.2 %, 3.9 %, 2.1%, 2.6 % and 1.3 %. HBsAg positivities among subjects above 20 years old were 8.9 %, 6.4 %, 5.9 %, 5.4 % and 5.4 %. The positive rates of HBeAg were 39.8 to 62.9 % among subjects between 6 and 19 years old, and 18.3 to 37.9 % among persons above 20 years old, in each year. In both subgroups, HBsAg positivity in the latter year was significantly lower than that in the former year (p<0.001). It also showed that HBsAg positivities among subjects between 6 and 19 years old have been significantly lower than those among subjects above 20 years old, but those of HBeAg the exact reverse of HBsAg since 1996. Conclusions: It was observed that prevalence of HBV infection in the late 1990s, especially in the group between 6 and 19 years old, was conspicuously lower than that in the past. The nationwide vaccination programme might be one of the most important contributors to this tendency in Korea.
Chemical Compositions and Pyrolysis Characteristics of Oil Shales Distributed in Korea
Yang, Moon Yul,Yang, Myoung Kee,Lee, Sang Hak,Wakita, Hisanobu 한국분석과학회 1995 분석과학 Vol.8 No.4
The chemical compositions and pyrolysis characteristics of oil shales and source rocks distributed in the southwestern and southeastern parts of the Korean peninsular have been investigated. In order to compare the results of Korean samples with those of shales giving high oil yields, two Colorado oil shale samples and one Paris source rock samples were also investigated. Chemical compositions of the samples were analysed by means of gravimetry, CHN analysis, X-ray diffraction method, inductively coupled plasma atomic emission spectrometry and atomic absorption spectrometry. A custom made pyrolyser and a Rock-Eval system were used for the pyrolysis studies. Pyrolyses of the samples were carried out by means of a temperature controlling device to $600^{\circ}C$ at a heating rate of $5^{\circ}C/min$ with a helium flow rate of $1200m{\ell}/min$. The results of pyrolysis study indicated that Colorado shale samples belong to type I and all the other samples belong to type II.
한국인의 위궤양 및 십이지장궤양 환자에서 Helicobacter pylori 감염 빈도
장명국(Myoung Kuk Jang),김학양(Hak Yang Kim),조병동(Byung Dong Cho),장웅기(Woong Ki Jang),김동준(Dong Jun Kim),김용범(Yong Bum Kim),박충기(Choong Kee Park),신형식(Hyung Sik Shin),유재영(Jae Young You) 대한내과학회 1997 대한내과학회지 Vol.52 No.4
N/A Objectives: Peptic ulcer is the major condition that affect numerous individuals every year. In 1983, Warren and Marshall presented the evidence that H. pylori was associated with gastritis and peptic ulcer. Thereafter, K. pylori infection is thought to be a important factor in the pathogenesis of gastric and duodenal ulcer. In western studies, about 58% to 100% of patients with peptic ulcer disease were infected with H. pylori. But in Korea, there is no study about the prevalence of H. pylori infection in peptic ulcer disease despite of its high prevalence and importance. The aim of this study was to investigate the prevalence of H. pylori infection in case of gastric and duodenal ulcer disease in Korea. Methods - We surveyed the prevalence of H. pylori infection of 1031 patients, who were diagnosed as gastric or duodenal ulcer by gastrofiberoscopy. H. pylori infection was evaluated with Rapid Urease Test(CLO test) and/or histology by Wright-Giemsa staining. Results: 1) Peptic ulcer was more frequently developed in males than females, as the frequency of peptic ulcer was 77% in males, and 23% in females. But in view of the prevalence of H. pylori infection, there was no significant difference between males and females, 73% in males and 71% in females. 2) Gastric ulcer was most common in sixth decade(29.8%), but the prevalence of H. pylori infection was peak in fourth(76%), and fifth decade (73%). 3) Duodenal ulcer was most common in fourth decade(26.3%), but the prevalence of H. pylori infection was peak in teenagers(93%) and third decade(87%). 4) The patients who had both gastric ulcer and duodenal ulcer concurrently were most common in sixth decade(27.9%), but the prevalence of H, pylori infection was peak in third decade(100%). Conclusion: We concluded that the majority of peptic ulcer patients in Korea had H. pylori infection. Particularly, young aged patients had higher H. pylori infection rate than old aged.
최종기(Jong-Kee Choi),안용호(Yong-Ho Ahn),윤용범(Yong-Beum Yoon),오세일(Sei-ill Oh),곽양호(Yang-Ho Kwak),이명희(Myoung-Hee Lee) 대한전기학회 2013 전기학회논문지 Vol.62 No.7
Power system fault analysis is commonly based on well-known symmetrical component method, which describes power system elements by positive, negative and zero sequence impedance. In case of balanced fault, such as three phase short circuit, transmission line can be represented by positive sequence impedance only. The majority of fault in transmission lines, however, is unbalanced fault, such as line-to-ground faults, so that both positive and zero sequence impedance is required for fault analysis. When unbalanced fault occurs, zero sequence current flows through earth and skywires in overhead transmission systems and through cable sheaths and earth in cable transmission systems. Since zero sequence current distribution between cable sheath and earth is dependent on both sheath bondings and grounding configurations, care must be taken to calculate zero sequence impedance of underground cable transmission lines. In this paper, conventional and EMTP-based sequence impedance calculation methods were described and applied to 345kV cable transmission systems (4 circuit, OF 2000mm2). Calculation results showed that detailed circuit analysis is desirable to avoid possible errors of sequence impedance calculation resulted from various configuration of cable sheath bonding and grounding in underground cable transmission systems.