• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.383-385
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• 2006

This paper summarizes the results of these efforts by offering a photovoltaic system structure in 50kW large scale applications installed in Chosun University dormitory roof and simulation tool. This describes configuration of utility interactive photovoltaic system which generated power supply for dormitory. In this paper represent 50kW utility PV system examination result.

• Proceedings of the KIEE Conference
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• 2008.04c
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• pp.199-201
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• 2008

This paper persents charge/discharge system for small PV using micro-processor. Charge/discharge system designs a Buck converter and using constant voltage charge system because regular voltage is rather high a condenser. Besides, we did compensate for charge voltage of condenser through a temperature compensation circuit. We consists of a 170W stand-alone PV system to observe charge/discharge system character. In the result of search about output character we know that charge and discharge are smoothly running.

• Proceedings of the KIPE Conference
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• 1997.07a
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• pp.380-385
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• 1997

The primary concern in designing any PV system is the determination of its optimum size. It is generally inadequate to use monthly or daily average insolation, and estimated number of continuous no sun days to determine array and battery capacities because the dynamic behavior of PV system and the stochastic nature of solar radiation also significantly influence the required array and storage capacity. Simulation method uses hourly meterological data and hourly load data to simulate the energy flow in a PV system, and predicts the system reliabilities under assumed array and battery sizes. Stand alone system for operating efficiency analysis of Photovoltaics system were discribed in this paper.

• Proceedings of the KIPE Conference
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• 1997.07a
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• pp.141-147
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• 1997

The variable speed drive system of a electric motor is popular in industry due to its economical aspect and simplicity of implementation, comparing with a steam turbine or the other engine driven. For a large pumping load like a feedwater pump rated about or more than 20,000㎾, a synchronous motor could be primarily considered. In this paper, we studied the modelling of a variable speed drive system consisted with a load commutated inverter(LCI) and a brushless sailent pole rotor synchronous motor(SM) using MATLAB/SIMULINK. Simulation was performed with a small SM motor parameters.

• Journal of the Korean Home Economics Association
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• v.38 no.7
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• pp.79-92
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• 2000

The purpose of this study is to verify the soundness of homelife and the stress of home management perceived by housewives living in Seoul as well as to investigate how the soundness of home life affects the stress of home management. In total, 914 housewives were studied to serve as a data sources. The major result are as follows : 1. Communication variables huts the strongest effect on the soundness of home life. 2. Wife's self-actualization influences the soundness of home life and home management stress. 3. Wife's internal-external control has an positive effect on the soundness of home life and home management stress. 4. The soundness of home management variables-family unification, time, psychological health, human ability, physical health should be developed as human capital.

• Journal of Korean Academy of Nursing Administration
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• v.20 no.5
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• pp.492-504
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• 2014

Purpose: The purpose of this study was to understand the meaning and essence of happiness by exploring and describing career nurses' lived experiences. Methods: Qualitative research was used in this study. Hospital nurses who had 3~5 years of experience in the clinical setting were interviewed and the data were analysed using Giorgi's phenomenological method. Results: Six main meanings and seventeen themes emerged. The six main meanings were as follows: self-confidence as a professional nurse, passion for self-realization, feeling of satisfaction in performance of nursing care, being grateful for working environment, emotional intimacy in interpersonal relationships, and taking delight and pleasure in leisure life. Conclusion: The results of this study provide deep understanding of happiness as positive experiences that increase job satisfaction and aid retention to the nursing profession. These results can be used in the development of effective strategies to improve and expand nurses' happiness.

• Journal of the Korean Home Economics Association
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• v.33 no.1
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• pp.45-60
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• 1995

The purpose of this study is to investigate some influencing factors related to the perception and the management behavior on the environmental pollution of the housewives in the metropolis. small city and Kun. This study is also to provide some knowledge and information on the environmental preservation. 2300 questionaires were distributed to the housewives from the end of April to the end of May in 1994. The 1850 quentionaires were obtained and the 1490 data were analyzed by frequency, percentage, mean, t-test, F-test, Duncan's prohoc test, stepwise multiple regression, path analysis and pearson's correlation. The most hypotheses of this study were accepted. Based on the findings of this study, the degree of concerns on the environmental provlems, the enviromental education, the einvironmental articles and the paticipation of the environmental events were the most important factors on the knowledge of the environmental preservation and the perception of the environmental pollution. And these factors were exerted important effects on the management behavior on the environmental preservation.

• Journal of Korean Academy of Nursing
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• v.37 no.4
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• pp.459-466
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• 2007

Purpose: This study was to identify predictors of quality of life in breast cancer patients. Physical and pscyhological factors like stress, mood, and fatigue with sociodemographic factors like education, income, job and stage of disease were used to predict quality of life. Methods: One hundred eleven patients with breast cancer participated in this study? The functional Assessment of Cancer Therapy-Breast(FACT-B) was used to assess quality of life. Results: The mean age of the patients was 46.7 years. The FACT-B mean score was 89.89(SD:17.31) Education, income, job and stage of disease were significantly associated with QOL. In a regression analysis, mood, income, and fatigue were significant predictors for QOL where as, stress was not significant. Among the subscales of QOL, physical well-being, functional well-being, emotional well-being, and the breast cancer subscale were included as predictors of QOL Conclusion: Physical and psychological factors were strong predictors of QOL. These results demonstrate the need for interventions to improve QOL in breast cancer survivors.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.11a
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• pp.217-219
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• 2012

In this study, the experiment was conducted in the level of mortar as one of the basic studies on pre-cast concrete which acceleration curing is not done. This study has the purpose to develop the strength of mortar into 20MPa within 6 hours in the condition of room temperature using admixtures which can accelerate C3S hydration reaction. In this experiment, W/C was fixed into 20%, PCE which can stimulate C3S was used as an accelerating admixture. From the results of this experiment, maximum content of accelerating admixture was 1%. Also, as more than 20MPa was measured through 6-hour compressive strength, it can be known that strength can be developed without steam-curing.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1394-1395
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• 2011

Now a days has problem of energy resource shortage and environmental pollution. We are looking up various solution plans regarding this problem. Solar power is one of the solution to solve the energy shortage problem. But solar power is affected by the weather. So variation weather we can use Maximum Power Point Tracing device for solar PV system. In this paper, New MPPT method is proposed to tracking MPP at low and high insolation by combining constant voltage method with Newton Method method.