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.

Captopril과 Nifedipine 병합요법의 강압효과에 관한 임상적 연구

이영수,문언수,김준호,공수정,정시진,주용진,정상만 건국대학교 의과학연구소 1993 건국의과학학술지 Vol.3 No.-

Background: The hypotensive effect of captopril(angiotensin converting enzyme inhibitor) and nifedipine(calcium channel blocker) was studied. Method: Captopril(75mg) and nifedipine(30mg) were administered in 30 hypertensive adults during twelve weeks after a week observation for washout with stepwise increments of the dose according to the patient's blood pressure in every two weeks. Result: The supine blood pressure were decreased from 169.5±22.3/104.0±20.3 mmHg to 130.4±21.3/82.4±19.5mmHg at the end of twelve weeks during therapy.(p<0.05) The standing blood pressure were also decreased conferrably and to the some lower level. Hematologic examination and blood chemistry revealed no discernible abnormal findings before and after the treatment. During the period of the study a few probably drug-related symptom such as cough and headache, gastrointestinal disturbance developed but not troublesome enough to administering. Conclusion: Captopril and nifedipine regimen is well tolerated and effective in the treatment of hypertensive patients.

유아 성폭력 예방교육활동의 적용효과에 관한 연구

최민수 ( Choi Min-soo ),공양님 ( Kong Yang-nim ) 열린부모교육학회 2016 열린부모교육연구 Vol.8 No.3

본 연구는 유아 성폭력 예방교육활동을 통하여 만 5세 유아의 성지식 및 성태도에 미치는 효과를 검증하여 유아교육현장에 실효성 있는 유아 성폭력 예방교육활동의 적용 가능성을 모색하기 위한 목적으로 이루어졌다. 이러한 목적을 위하여 G광역시에 소재하는 K어린이집 유아 18명에게는 유아 성폭력 예방교육활동을 적용하였고, B어린이집 유아 19명에게는 일상적인 누리과정에 따른 교육활동이 적용되었다. 유아의 성지식과 성태도를 조사하기 위해 사용한 검사도구는 백라지(2004), 한선희(2005), 우민정(2010)이 사용한 도구를 김수미(2012)가 재구성하여 사용한 검사도구를 사용하였다. 자료분석은 독립표본 t검증으로 분석하였고, 통계적 유의도 수준은 .05 이상으로 하였다. 연구결과 유아 성폭력 예방교육활동의 적용효과는 유아의 성지식과 성태도에서 실험집단이 통제집단에 비해 통계적으로 유의미하게 높은 것으로 나타났다(p < .001). 본 연구결과를 통하여 유아 성폭력 예방교육활동 적용은 유아의 성지식 및 성태도를 증진하는데 효과적인 것으로 입증되었다. 즉, 유아 성폭력 예방교육활동을 체계적으로 경험한 유아들은 그렇지 않은 유아들에 비하여 성폭력 안전에 관련된 위협적인 상황이 발생했을 때 더 안전하게 위협에 대처할 수 있는 능력이 증진되었음을 나타내는 증거로 해석될 수 있다. 이러한 결과는 유아들에게 보다 적극적으로 성폭력 예방교육을 실시해야 할 시사점을 제공하고 있다. This study was carried out for the purpose of grouping the possibility of applying realistic, effective prevention education activities from infant sexual violences in infant education fields by verifying influencing effects on infants` sexual knowledge and sexual attitudes of 5-year in full through prevention education activities from infant sexual violences. For doing so, prevention education activities from infant sexual violences were applied to 18 infants in K Daycare Center located in G Metropolitan City, and educational activities according to daily Nuri process were applied to 19 infants of B Daycare Center. For the test tool having been used to investigate sexual knowledge and sexual attitudes, it was utilized after Kim Soo-mi (2012) recomposed the using tool by Back La-gi (2004), Han Seon-hee (2005), and Woo Ming-jeong (2010). Data analyse were done by independent sampling t-Test, and statistical significance level was made to over .05. Research results are same as follows. Prevention education activities from infant sexual violences appeared higher significantly at the experimental group than the control group in sexual knowledge and sexual attitudes.(p<.001). This finding indicates that prevention education activities from infant sexual violences was turned up as giving positive influences to whole sexual knowledge and sexual attitudes relatively rather than educational activities centering on life theme in Nuri process, and there were prominent differences from coping capabilities in the process of groping ways of doing practices when situations of doing threats on safety of sexual violences in infant education fields occur.

초등학교 체육과 교육과정의 관심도와 활용도에 대한 연구

공기화,김수희 부산교육대학교 교육대학원 2003 논문집 Vol.5 No.-

The study was to define in quantify and quality the relationship of the current stages of concern and levels of use toward of the 7th physical education curriculum in elementary school as a teacher in Busan. In the quantitative research, teachers who work in Busan in total 300 are questioned to get the answers over the questions I suggested and I got 290 for the analysis. In the qualitative research the total 4 teachers. who were selected subjects who wanted to joint with pleasure. The statistic methods used for the data analysis depended upon on foctor analysis, pearson correlation, t-test. one-way ANOVA and Duncan post-test. From the analysis of data. this study reached the following conclusion. First. stages of concern over the 7th physical education curriculum of elementary school show that most teachers aren't interested in it or don't know about it. Second, the utilization level for the 7th physical education curriculum in elementary school show partly difference to statistical disproportion of population. In the sex male is placed higher level for utilization of feature. materials On the other hand, female is placed higher level for utilization of theory. method. In the teaching experienced one has, the higher level he is placed for utilization of purpose, theory, method Third. a significant difference was found between the stages of concern and levels of use toward of the 7th physical education curriculum in elemantary school. Fourth, most teacher feel so hard to teach the 7th physical education curriculum in elemantary school. These facts suggest that supplies of the teaching materials and equipment for operating the physical curriculum should be increased.

CRW형식 무인항공기 추진시스템의 밸브작동을 고려한 비행모드 전환에 따른 천이성능 특성 연구

공창덕,박종하,강명철,양수석 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1

본 연구는 CRW형식 무인항공기 추진시스템의 밸브작동을 고려한 비행모드에 따른 천이 성능특성을 파악하기 위해 SIMULINK를 이용하여 모델링 하였다. 주 엔진시스템의 천이 모사에는 ICV방법이 적용되었다. 그리고 밸브시스템은 로터리 덕트와 메인 덕트로 빠져나가는 유량을 제어하는 시스템으로서 밸브를 통해 로터리 덕트로 빠져나가는 유량과 메인 덕트를 빠져나가는 유량의 합은 터빈의 출구 유량과 같다는 가정하에 수행되었으며, 이 때 밸브각 변화에 따른 손실, 유량 및 유효면적 등이 고려되었다. 성능해석은 비행 천이 영역인 고도 1Km 비행마하수 0.1에서 엔진최대회전수시 회전익 모드에서 고정익 모드로 변환시외 고정익 모드에서 회전익 모드로 변환 경우들이 수행되었다. In order to investigate transient behaviour of the CRW(Canard Rotor Wing) type UAV(Unmanned Aerial Vehicles) propulsion system during flight mode transition considering flow control valve operation, the propulsion system was modelled using SIMULINK commercial program. For transient simulation of the main engine system, the ICV(Inter-Component Volume) method was applied. The valve system is to control the gas flow of the rotary duct system and the main duct system, and the analysis was performed with an assumption that the total gas mass flow of the main engine is the same as summation of the rotary duct flow and the main duct flow, and with consideration of valve loss, flow rate and effective area in valve angle variation. The performance analysis was carried out during flight mode transitions from the rotary flight mode to the fixed wing flight mode and vice versa mode at altitude of 1Km, flight Mach number 0.1 and maximum engine rpm.

남·북한 간의 초등학교 체육과 교육과정의 비교 연구

공기화,김수봉 부산교육대학교 초등교육연구소 2006 초등교육연구 Vol.21 No.-

The purpose of this study was two-fold; to enhance mutual understanding by analyzing in physical education and provide basic source for an integrated in physical education for unified country. To do this, the curriculum of elementary physical education was analyzed to overcome heterogeneity and antagonism between South Korea and North Korea, and to recover homogeneity and to increase understanding each oher. The conclusions were as follow; First, the curriculum of physical education has changed 7times in the South, but in North it has been frequently changed by influences of both ideology and idolization for Il-sung Kim and Jung-il Kim. Second, in terms of curriculum goals the South has focused on realizing a wish to move, enhancing physical strength, understand knowledge about exercise and health, and fostering impassioned communists as able builders of the socialist-communist country. Third, learning content of the curriculum in the South consists of four areas for grades 3 and 4, and six areas for grades 5 and 6. In the North, walking, running, disciplinary exercise, exercising with balls, throwing, up and down, and cultural exercises are the main contents of the curriculum. Especially, it is noticeable that some kinds of exercises related to the national defense such as ocean exercise and the training for height - growing are implemented. Fourth, physical education in the south is based on the National common basic Curriculum consisting of 10 subjects, but grades 1 and 2 are run as integrated subjects; On the basis of 34 weeks, 3 hours per week, and a total of 102 hours per year. The curriculum of th North consists of 10 subjects. On the basis of 38 weeks, classes for physical education are 2 hours per week from grade 1 to grade 4; thus, a total of 76 hours per year, and 304 hours for four years. It means that physical education takes th 8.4 percent of the total subjects. Finally, in the South assessment of physical education viewed as part of a circular process of education rather than as the termination of education was breaked down in detail and systematically presented. In the North, rather than assessing physical education all the students should take compulsory The Common people Fitness Test.

기능성 킬레이트 고분자 Ⅳ -VSA-VP-DVB 킬레이트 수지의 이온교환 특성-

김공수, 심상무, 김경호, 김영식 忠北大學校 1986 論文集 Vol.32 No.-

-본문참고-

Methylene-bis-salicylaldehyde 誘導體를 基礎로한 高分子schiff鹽基의 金屬킬레이트에 關한 硏究

김공수,孟琦錫 충남대학교 1977 工業技術開發硏究所論文集 Vol.4 No.2

Several derivatives of methylene-bis-salicyladehyde were prepared by treating salicyladhyde and nitrosalicylaldehyde with trioxane in presence of sulfuric acid catalyst in acetic acid media. These methylene-bis-salicylaldehyde derivatives were converted to polymeric schiff bases with molecular weight of about 1×10^4∼1.2×10^4 by polycondensation with diamines, ethylenediamine, hexamethylenediamine, p-phenylenediamine and m-phenylenediamine in tetrahydrofuran-aceticacid media. The divalent metal, Cu(Ⅱ), Zn(Ⅱ), Fe(Ⅱ), Co(Ⅱ) and Ni(Ⅱ) chelates of polymeric schiff bases have been prepared, and their thermal stability were also studied. 1. In the preparation of methylene-bis-salicylaldehyde derivatives were also found the optimum reaction condition, and the yield of dialdehyde was related to the amount of sulfuric acid catalyst used, and a low sulfuric acid concentration helped the ratio of reactant favorable for the preparation of methylene-bis-salicylaldehyde derivatives. 2. It was evident that the electron withdrawing substituent in nitrosalicylaldehyde accerelated the rate of reaction, and in the reaction with trioxane of p-nitrosalicylaldehyde proceeded rather rapid than that of o-nitrosalicylaldehyde under the same reaction condition. 3. These metal chelates of polymeric schiff bases exhibited the maximum absorption in the 380mm∼525mm region. 3. The metal chlates of polymeric schiff bases prepared from methylene-bis-salicylaldehyde derivatives with p-, and m-phenydenediamine showed higher thermal stability and decomposed in air over 300℃. 5. The thermal stability increased in the order Co(Ⅱ), Cu(Ⅱ), Fe(Ⅱ), Ni(Ⅱ), to Zn(Ⅱ) chelate of poly(3,3'-methylene-5,5-dinitro-N,N'-bis-salicylaldehyde)-p-phenylenediimine, and in the order Co(Ⅱ), Cu(Ⅱ), Ni(Ⅱ), Zn(Ⅱ) to Fe(Ⅱ) chelate of poly (5,5'-methylene-3,3'-dinitro-N, N'-bis-salicylaldehyde)-p-phenylenediimine when heated in the open air at 250℃ for periods up to 3 hrs.

신경망 제어기에 의한 고정도 위치제어

이수성,하홍곤 東義大學校産業技術開發硏究所 1998 産業技術硏究誌 Vol.12 No.-

In this paper, the design-method of controller using a neural network to compensate a error signal between a reference signal and a system-response is proposed in the I-PD control system with a pre-compensator. A neural network which is used here is a neural network with mixed structure the error signal is compensated by the feedback values of a delayed error signal, a plant-input and a system-response and the algorithm to correct the coupling coefficients which connect each layer is derived by using the back propagation. We can obtain the good characteristics by choosing the adjustment-constant on the feedback-coefficient of plant-input, the adjustment-constant on the feedback-coefficient of system-response, the initial condition on the feedback-coefficient of plant-input, and the initial condition on the feedback-coefficient of system-response.

지식사회에서의 조직구조 설계방안에 관한 연구

김공수 군산대학교 지역개발연구소 2000 地域開發硏究 Vol.12 No.-

Firms face with new challenges and crises resulting from the hyper-turbulent and chaotic environments. They must search for new management paradigms for surviving and overcoming these threats. The purpose of this study is to describe the organization structure of knowledge-based society in 21C. We can expect that the locus of organizational exemplars has shifted from capital-intensive industries to information-intensive industries and now toward innovation-driven industries where competitive advantage lies mostly in the effective use of human resources. And each major era in industries history has featured a particular form of organization. Early hierarchical, vertically integrated organization have largely given way to network organizations that link the assets and know-how of numerous upstream and downstream industry partners. A number of leading companies today are experimenting with a new way of organizing, self-organizing form. Self-organizing form are built on the design principles of holographic system that are included the principle of redundant functions, the principle of requisite variety, the principle of learning to learn and the principle of minimum critical specification. In the future, holographic organization will be used in situations requiring continuous learning and innovation.