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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).
N-(2-Deoxy-β-D-glucopyranosyl)-N`-(4-aminomethyl-2-imino-1,3-thiazoline)urea 유도체의 합성
한호규 ( Hoh Gyu Hahn ),마혜덕 ( He Duck Mah ),신동윤 ( Dong Yun Shin ),허정회 ( Jeong Hoe Heo ),한민수 ( Min Soo Han ),남기달 ( Kee Dal Nam ) 한국키틴키토산학회 2009 한국키틴키토산학회지 Vol.14 No.2
N-(2-Deoxy-β-D-glucopyranosyl)-N`-(4-aminomethyl-2-imino-1,3-thiazoline)urea 유도체 7을 isocyanato-β-D-glucopyranose6와 4-aminomethyl-2-phenylimino-1,3-thiazoline 유도체 4로부터 합성하였다. β-D-glucopyranosyl isothiocyanate 6은 β-D-glucosamine 염산염 5을 탈염산화 한 다음 triphogene과 반응시켜 합성하였으며 상온에서 불안정하여 분리할 수 없었다. 4-Phthalimidyl-1,3-thiazoline 유도체 3은 α-bromoketophthalimide1과 상응하는 N-methyl-N`-phenylthiourea 유도체 2를 반응시켜 합성하였고, 이것의 프탈리미드 보호그룹을 methylamine으로 처리하여 탈보호하여 4-aminomethyl-1,3-thiazoline 4 유도체를 합성하였다. 본 연구에서는 β-D-glucopyranose 6의 C-2 위치에 ureido 기능기를 도입할 수 있는 효과적인 방법을 제시하였다. N-(2-Deoxy-β-D-glucopyranosyl)-N`-(4-aminomethyl-2-imino-1,3-thiazoline)urea derivatives 7 were synthesized from a reaction of isocyanato-β-D-glucopyranose 6 with 4-aminomethyl-2-phenylimino-1,3-thiazoline derivatives 4.β-D-glucopyranosyl isothiocyanate 6 was obtained by a dehydrochlorination of β-D-glucosamine hydrogenchloride salt 5 followed by the reaction of triphogene, which was unstable to isolate at room temperature. 4-Phthalimidyl-1,3-thiazoline dervitives derivatives 3 were prepared by a reaction of α-bromoketophthalimide 1 with the corresponding N-methyl-N`-phenylthioureas 2, of which phthalimidyl protecting group was deprotected by the treatment of methylamine to give the 4-aminomethyl-1,3-thiazolines 4. The effective methodology for synthesis of β-D-glucopyranose derivatives in which ureido function was introduced at C-2 was presented from this study.