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Analysis of Insulation Diagnosis for Generator‑Motor Stator Winding in Pumped Storage Power Plant
Soo‑Hoh Lee,Tae‑Sik Kong,Hee‑Dong Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3
In this study, insulation diagnostic tests were conducted on pumped storage power plant (PSPP) generator-motor stator bars with artifcially simulated defects in order to improve solutions to perform preventive maintenance and track insulation diagnostic data for generator-motors by proving the efectiveness of insulation indices. Moreover, ozone (O3) concentration was estimated in order to relate it to partial discharge (PD) in laboratory to ensure the efectiveness of ozone as another index for insulation deterioration. By performing an ofine PD test and ultraviolet (UV) observation on one of the generator-motors during overhaul, and an ozone concentration measurement for the identical machine after the overhaul, it was concluded that ozone estimation could be a powerful index for insulation diagnosis under actual operational conditions. It was further developed that ozone measurement is useful to detect not only discharges in slots as mentioned in some studies but also discharges at the end-winding as proven in this study. The fndings of this study are expected to contribute to more reliable maintenance of generator-motors in PSPPs by achieving elaborate insulation diagnosis via multiple diagnostic indices.
김보배,노은경,박서영,박영,오승희,전영란,차현진,윤희상,김수지,이자형 이화여자대학교 간호과학대학 2004 이화간호학회지 Vol.- No.38
This study surveyed and analyzed comparatively college students-knowledge' attitude, was to cultivate the right knowledge and attitude on sex, and serve the foundational data for the suitable sex education. The purpose of the study was to identify and examine: 1) students; sexual knowledge and sexual attitude; 2) the differences between variables of gender, age, and self-perceived sexual knowledge in relation to sexual knowledge and sexual attitude; and 3) the relationship between sexual knowledge and sexual attitude. For this study the questionaires were given to 300 students from five different universities located seoul areas. the questionaires were collected Jenuary 8th to 15th in 2004. Two hundred and nigty one samples were analyzed for the study. The adapted SKAT(saxual knowledge & attitude test; Lief & Reed, 1986) was used to determine sexual knowledge and the students' sexual attitude. Collected data were analyzed statistically by means of percentage, t-test, ANOVA test, and pearson correlation analysis with SPSS 12.0 package program. The main results of this analysis are as follows: Participants consisted of male(48.1%) and female(51.9%) which were mainly between the ages of 21.25(71.8%) with an age range of 19 to 30. Knowledge of sexual disease was scored highest of 92.4%, and konwledge of the knowledge of the male and female's anatomy was the lowest at 60.9%. The respondents' level of sexual attitude was tolerant as on average 3.66(on the basis of 5) Relating to the items, the respondents' score of the sexual curiosity was 4.16, sexual behavior 3.85, self-consolation 3.81, aborthon 3.23, virgine 3.19, extramarital experiences 3.17. There were no significant differences in sexual knowledge between male and females, between younger and older students, residence, sexual experience, and how students mainly obtained their sexual knowledge. But a significant difference was also found religion in their sexual attitude(p<.005). In addition, results showed the relationship between sexual knowledge and sexual attitude(P=0.332).
이승훈,황응수,김익상,차창용,국윤호,최강원,김윤원 대한미생물학회 1985 大韓微生物學會誌 Vol.20 No.1
The advantages of enzyme-linked immunosorbent assay(ELISA) are its senstivity and simplicity in detecting IgM and IgA antibody. To apply ELISA to diagnosis of typhoid fever, antigen such as lipopolysacc-haride of Salmonella typlii or killed whole cell must be coated on solid phase. It is easy to coat lipopolysaccharide on ELISA plate but troublesome to purify it. As it is easy to obtain the killed whole cells, the development of the appropriate method by which those antigens of S. typhi are optimally coated on solid phase is needed. To establish the appropriate method, carbonate buffer, methanol or poly-L-lysine was applied as binding substance on polystyrene or polyvinylchloride plate as solid phase when the killed whole cell antigens of .S. typhi varided as follows: 10_6, 10_7, 10_8 and 10_9 cell/ml. The criteria of the optimal method were determined as follows: 1. The optical density of positive sera is above 1.0(0.6 in IgM) at 1: 10 serum dilution and is 0.3(0.2 in IgM) higher than that of negative sera: 2. The C3.D. of sera is flat or lowering according to serum dilution; 3. It must be that the O.D. of negative sera is lower than 0.2 at the point of serum dilution where the O.D. of positive sera is higher than 1.0 (0.5 in IgM). The results obtained were summarized as follows; 1. The methods which fitted the above criteria were to use poly-L-lysine as binding substance, polyvinylchloride plate as solid phase and 10 cell/ml as antigen concentration of Z typhi (poly-L- lysine/ polyvinylchloride/10 and poly-L-lysine/polyvinylchloride/10 in detecting IgG antibody, methanol/ po-lystyrene/10_9, poly-L-lysine /polyvinylchloride/10_8 and poly-L-lysine /pilyvinylchloride /10_9 in IgM and carbonate buffer/polystyrene/10, carbonate buffer/polystyrene/10_8, methanol/polystyrene/10_5, methanol/ polyvinylchloride/10_9, methanol/polyvinylchloride/10_9, poly-L-lysine/polyvinylchloride/10_9 and poly-L-1ysine/polyvinylchloride/10_9 in IgA. 2. The coating method using poly-L -lysine, polyvinylchloride plate and 10_9 cell/ml was best toassay gG, IgM and IgA antihcody all in one. By this method, to assay the each immunoglobulin calss with an appropriate fixed serum dilution, 1: 320 dilution was best.
The Antigenic and Genomic Variation of Human Cytomegalovirus(NHCNV) Isolated in Korea
Eung-Soo Hwang(황응수),Hong-Bock Lee(이흥복),Dong-Gyun Lim(임동균),Ju-Young Seoh(서주영),Chung-Gyu Park(박정규),Jae-Won Park(박재원),Hyun-Soon Jong(정현순),Yoon-Hoh Kook(국윤호),Hoan-Jong Lee(이환종),Byoung-Kook Kim(김병국),Chang- 大韓微生物學會 1994 大韓微生物學會誌 Vol.29 No.6
Filtered Backprojection에서 정착자를 사용한 고주파 감쇠
이수진,김용호,Lee, Soo-Jin,Kim, Yong-Hoh 배재대학교 공학연구소 1997 공학논문집 Vol.2 No.1
Emission computed tomography에 있어서 Bayesian방법에 근거한 통계학적 영상 재구성법이 수년간에 걸쳐 중요한 관심사로 대두되어 왔다. 이는 Bayesian 접근 방법을 사용할 경우 영상 재구성 알고리즘에 재구성하고자 하는 영상에 대한 사전정보를 포함시킬 수 있기 때문이었다. 이러한 방법은 경우에 따라 향상된 성능을 보이고 있으나, 막대한 계산시간으로 인해 실제 임상에 적용되기가 매우 어려운 상황이다. 한편, filtered backprojection(FBP)은 알고리즘 자체가 간단하고 계산시간도 매우 단축되므로 대부분의 임상에 널리 적용되고 있다. 본 연구에서는 Bayesian 영상 재구성에서 매우 유용하게 사용되는 spline 모델을 FBP의 고주파 감쇠를 위한 정칙자로 사용함으로써 FBP 영상 재구성에 Bayesian 방법과 유사한 효과를 얻을 수 있음을 보인다. In emission computed tomography, statistical reconstruction methods in the context of a Bayesian framework have been a topic of interest over the last decade. This was mainly due to the fact that Bayesian approaches can incorporate a priori information into the reconstruction algorithm. Although these approaches can exhibit good performance, their applications to the clinic is hindered mainly by their high computational cost. On the other hand, the speed and simplicity of the filtered backprojection (FBP) algorithm have led to its widespread use in most clinical applications. In this work, we use spline models, which have been quite useful in Bayesian reconstruction, as regularizers for high-frequency apodization in FBP algorithm and show that the effects of using spline models as priors in Bayesian reconstruction can also be achieved in FBP reconstruction.
결핵균 및 기타 3종 Mycobacteria 의 파쇄추출항원과 교차반응하는 폐결핵환자의 항체분석
황응수,조명제,심영수,김익상,차창용,국윤호,이승훈,한용철,배길한,김상재 대한미생물학회 1985 大韓微生物學會誌 Vol.20 No.1
It is important to discriminate between tuberculosis and tuberculosis-like disease by Mycobacteria other than tuberculosis in the serodiagnosis of tuberculosis. But because common antigens share among Mycobacteria, their antigenicities to human are similar. Therefore degree of cross-reactivity of anti-body in the sera of patients with tuberculosis between M. tuberculosis and Mycobacteria other than tu- berculosis should be checked to increase the specificity in the serodiagnosis of tuberculosis. The activity levels of IgG antibody in the sera of 106 patients confirmed as active pulmonary tuber-culosis and 30 normal healthy control person to the pressate extract antigen (TE, BE, AE, and FE antigen) from M. tuberculosis, M. bovis, M. avium, and M. fortuitum were measured by enzyme-linked immunosorbe:nt assay and the crossreactivity of IgG antibody with mycobacterial species was analysed. The results were as follows; 1. The activity level (O.D. at 492nm) of 1gG to TE antigen in sera of patients with pulmonary tuber- culosis was 0.228±0.167 in minimal tuberculosis; moderately advanced, 0.556±0.616; far advanced, 1.116±0.651 and 0.315±0.245 in miliary tuberculosis. 2. The actiivity level (O.D. at 492nm) of IgG to BE antigen in sera of patients with pulmonary tu-berculosis was 0.190+0.162 in minima1 tuberculosis; moderately advanced, 0.337+0.361; far advanced, 0.713+0.460 and 0.204±0.162 in miliary tuberculosis. 3. The activity level (O.D. at 492nm) of IgG to AE antigen in sera of patients with pulmonary tu-berculosis was 0.165±0.114 in minimal tuberculosis; moderately advanced, 0.392±0.494; far adven- ced, 0.751±0.512 and 0.2330.191 in miliary tuberculosis. 4. The activity level (O.D. at 492nm) of IgG to FE antigen in sera of patients with pulmonary tub- erculosis was 0.280±0.227 in minimal tuberculosis; moderately advanced, 0.460±0.564; far advan- ced, 0.845±0.573 and 0.257±0.103 in miliary tuberculosis. 5. The activity level (O.D. at 492nm) of IgG in sera of healthy control person was 0.126±0.084 to TE antigen, 0.105±0.041to BE antigen, 0.103±0.052 to AE antigen, and 0.095±0.061 to FE antigen. 6. Degree of correlation(r) in activity level of IgG between TE antigen and BE antigen was 0.905; between TE antigen and AE antigen, 0.760; between TE antigen and FE antigen, 0.790, and be- tween AE antigen and FE antigen,0.945. 7. As O.D. above 0.200 was determined positive for the serodiagnosis of pulmonary tuberculosis, the sensitivity and specificity in ELISA using TE antigen were 80% and 87% respectively, whereas in the case of using BE antigen, 66% and 100%; in the case of using AE antigen, 62% and 100 %, and in the case of using FE antigen, 72% and 93%, respecitively.