• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.2
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• pp.360-369
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• 2008

The solar cells should be operated at the maximum power point because its output characteristics were greatly fluctuated on the variation of insolation, temperature and load. It is necessary to install an inverter among electric power converts by means of the output power of solar cell is DC. The inverter is operated supply a sinusoidal current and voltage to the load and the interactive utility line. In this paper, the proposes a photovoltaic system is designed with a step up chopper and single phase PWM voltage source inverter. Synchronous signal and control signal was processed by one-chip microprocessor for stable modulation. The step up chopper is operated in continuous mode by adjusting the duty ratio so that the photovoltaic system tracks the maximum power point of solar cell without any influence on the variation of insolation and temperature for solar cell has typical dropping character. The single phase PWM voltage source inverter is consists of complex type of electric power converter to compensate for the defect, that is, solar cell cannot be develop continuously by connecting with the source of electric power for ordinary using. It can be cause the efect of saving electric power, from 10 to 20%. The single phase PWM voltage source inverter operates in situation, that its output voltage is in same phase with the utility voltage. The inverter are supplies an ac power with high factor and low level of harmonics to the load and the utility power system.

• The Journal of the Korea Contents Association
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• v.7 no.11
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• pp.175-181
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• 2007

Design prototype is described from the stately aspect as a principle of formative art, and from the shapeable aspect of physical feature. The prototype can be a common denominator which is contained in one nation's culture, art and life, as the thing which corresponds to the daily industrial craft, architecture and art's production intention and activity with the thought and background of the culture. We have formed the design prototypes with time and space in the process which absorbs and integrates the new culture. Modern Korean design's prototype can be seen in the late Chosun. As the upper culture and sub-culture were combined, the active culture was developed. Nobody can deny that Chosun's culture and art becomes a basis of today's design and Korea's beauty. In creating the design prototype, the natural environmental factors such as topography and climate are the most important. Such natural environmental factor led the design recognition of art and craft art, as well as an architecture and indoor environment's form. Korea design produced the artisan sprite which is devoted to a moral duty and instinct as our nation's nature and emotion, and ensured the emotional process not the rational process. So, it created naturalism which accepted the material and shape. Our design prototype's path tracking as an energy of future society's new design identity, can be the important theme for our design development.

• The Journal of the Korea Contents Association
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• v.12 no.7
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• pp.394-405
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• 2012

This study is aimed at developing a tool to measuring school police's job performance, and verifying its credibility and validity. This study collected the sample to 250 subjects using a significance collection method to parents of elementary schools school police work. But excluding dishonestly responding data, this used total 210 people for the final analysis. This study executed experts' meeting, exploratory and confirmatory factor analysis, and item analysis to verify reliability, and verification of internal consistency and reliability. This study extracted and confirmed 7 factors for specialization, attitude, program, prevention activity of school violence, effect, basic duty, teaching for school time and home time, and correlation with related people. Through the above research approach and procedure, this study arrived at the following conclusion. First, validity to school police's job performance and measurement tool to job performance is very high. That is, school police's job performance was explored and confirmed through correlation with specialization, attitude, program, prevention activity of school violence, effect, basic job, teaching for school time and home time, and related people, and of them, explanation of attitude is the highest. Second, reliability to the measurement scale for school police's job performance is very high. That is, school police's job performance has high correlation between items, sub-factors, and total scores, and reliability of internal consistency, Cronbach's ${\alpha}$ value, is over .708. Putting them together, measurement scale for school police's job performance is a questionnaire sheet with very high level of validity and reliability.

• Korea journal of population studies
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• v.34 no.1
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• pp.1-25
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• 2011

There are two main purposes in this study. First, we compare the effects of wives' characteristics with the effects of the husbands' characteristics on the induced abortion. Second, we analyze whether the determinants of the induced abortion have changed according to parity and conception period. The main findings are follows. First, both wives' and husbands' socioeconomic characters have insignificant effects on the induced abortion at parity 0, in the 1997 and 2000 Korean Fertility Survey data. Second, during the periods of the lowest-low fertility, after 2000 in Korea, wives' employments have positive effects at parity 0 and 1, while husbands' educational levels have negative effects at parity 1 on the induced abortion. The implications are as follows. First, having children had been the universal social phenomenon before 2000 in Korea. however, after 2000, reproductions have become the women's choice, lather than the duty of married women. Women must weight the balance between the benefits and the costs of children so that women's fertility behaviors become a rational choice. Women's employment is the most important factor in these rational calculations. Second, both Western individualism and the traditional Korean familism have significant effects on the fertility behavior and the induced abortions in Korea. This rejects the diffusion theory, which tells that the traditional familism must be replaced by the Western individualism in order to decline the fertility rates in developing countries.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.12
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• pp.1380-1393
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• 2010

This paper presents a design, fabrication and the test results of planar active electronically scanned array(AESA) radar prototype for airborne fighter applications using transmit/receive(T/R) module hybrid technology. LIG Nex1 developed a AESA radar prototype to obtain key technologies for airborne fighter's radar. The AESA radar prototype consists of a radiating array, T/R modules, a RF manifold, distributed power supplies, beam controllers, compact receivers with ADC(Analog-to-Digital Converter), a liquid-cooling unit, and an appropriate structure. The AESA antenna has a 590 mm-diameter, active-element area capable of containing 536 T/R modules. Each module is located to provide a triangle grid with $14.7\;mm{\times}19.5\;mm$ spacing among T/R modules. The array dissipates 1,554 watts, with a DC input of 2,310 watts when operated at the maximum transmit duty factor. The AESA radar prototype was tested on near-field chamber and the results become equal in expected beam pattern, providing the accurate and flexible control of antenna beam steering and beam shaping.

• Journal of dental hygiene science
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• v.17 no.2
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• pp.168-174
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• 2017

This study was conducted to provide basic data on the relationship between the happiness and job satisfaction of dental hygienists. The research subjects were 264 dental hygienists in Busan and Gyeongsangnam-do. The study was conducted using structured questionnaires and the collected data were analyzed using IBM SPSS software, ver. 20.0. The happiness index, which was based on general characteristics, showed the greatest significant differences in life satisfaction (p<0.05) among adults over 36 years of job experience, negative emotions (p<0.01) among adults under 25 years of job experience, and negative emotions (p<0.05) among adults with 4~10 years of job experience. The factors that improved the job satisfaction of dental hygienists were life satisfaction, prime duty at the work place, and a positive effect. On the contrary, negative emotions lowered the job satisfaction. The happiness of the dental hygienist is an important factor not only for the improvement of the hygienist's personal quality of life, but also the patient's health. It is necessary for dental hygienists to maintain good relationships with coworkers during in the workplace, as well as employers, to have an administrative system that offers proper compensation, improvement of the work environment, and opportunities to improve professionalism at the workplace.

• Journal of Korean Academy of Nursing Administration
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• v.10 no.4
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• pp.495-513
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• 2004

As this study is the descriptive research study that tries to present the basic data aiming to establish a role of nurses for the Community Welfare Center, by surveying the role expectation and the degree of role performance towards nurses for the Community Welfare Center that nurses for the Community Welfare Center and social workers recognize, it carried out the Questionnaire research targeting nurses who are working for the Community Welfare Center located in Seoul and social workers of institutions where nurses are working, and then analyzed the results, and the study results are as follows. Both the group of nurses and the group of social workers were highly recognizing the necessity and the importance of nurses for the Community Welfare Center, and expected that more effective services will be possible to be offered by means of that nurses do work for the Community Welfare Center. However, compared to the degree that social workers recognize a nurses specialty, the nurses thought that their specialty is not acknowledged in the Community Welfare Center, and even in case of duty friction between groups being felt while social workers and nurses are working together, nurses were experiencing further friction of duties. While nurses are well recognizing their roles, they are statistically and significantly recognizing the degree of role performance lower than expected, thus the difference between the role expectation and the role performance could be seen. Also, the group of nurses showed the higher role expectation towards nurses than the group of social workers, and in relation to roles of a counselor, referral resource, an advocator, an educator, a case manager, a and a coordinator, the degree of role expectation by the group of nurses is statistically and significantly higher than the group of social workers, thus it could be seen that there is difference in the expectation degree between both groups, as to a role of nurses for the Community Welfare Center. In particular, as to a role of universally medical services, the expectations between nurses and social workers showed mutual agreement, but in relation to a role of nurses for community in the more expanded sphere, social workers did not show a receptive attitude, thus it was indicating that there exists an element of role conflict. In relation to the role performance of nurses for the Community Welfare Center, nurses were feeling the disorder degree more than social workers, in all items of disorder factors, and there was difference in recognition between nurses and social workers, as to the priority of disorder factors. Because of, through this study, having been found the difference in recognition of role expectation, the degree of role performance, and a disorder factor between nurses and social workers, as to the nurses for the Community Welfare Center, it is required a study with a more diversified method on a role of nurses for the Community Welfare Center.

• Convergence Security Journal
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• v.17 no.2
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• pp.173-183
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• 2017

This study is for presenting the factors about success attribution that fit the korean security service conditions and developing the actual analysis of measurement tools by investigating the success factors of the security service agents. To this end, conducted a meeting from the fully open questionnaire at first, and then formed the semi-structured questionnaire, finally carried out the survey from the closed questionnaire and analyzed data from SPSS 21.0, AMOS 21.0 and developed the measurements. It was conducted from December, 2014 to June, 2015. This survey was conducted of 170 security guards after the verification of the content validity though the pilot survey and presented the success attribution factors and standards on the basis of the result form this survey. At the first and second analysis process, the success attribution factors of the guards consisted of inner qualities, external qualities, induction factors for inner qualities, and induction factor for external qualities. On analysis of the final data and documents, however, at the third analysis, the success attribution factors of the guards consisted of 'martial arts and physical ability'(4 questions), 'attitudes to work'(3 questions), 'support for the working environment'(3 questions), 'organized business skills'(3 questions), 'attitudes to the duty'(3 questions), and 'coping with crises(2 questions).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.6
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• pp.449-458
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• 2017

This research is a descriptive correlation research for comprehending the end of life care stresses, work environment, and reduction of nurses in geriatric hospitals and analyzing the factors influencing their burnout. We recruited 195 nurses from 8 geriatric hospitals in B metropolitan city and collected data on the end of life care stress, work environment and reduction using organized questionnaires. The data were analyzed with SPSS WIN 21.0 program. The average grade of end life care stress was $3.84{\pm}0.56$, nursing work environment $3.25{\pm}0.60$, and burnout $2.93{\pm}0.52$. There was a positive correlation between the end of life care stress and reduction(r=.206, p=.004) but a negative correlation between nursing work environment and reduction(r=-.431, p<.001). The most influential factor on the reduction was nursing satisfaction(${\beta}=-.302$), followed by work environment(${\beta}=-.294$), age(${\beta}=.286$), duty style(${\beta}=-.17$), and end of life care stress(${\beta}=.164$). The overall explanatory power was 41.2%.These results suggest that in order to minimize the reduction of nurses in geriatric hospitals, the provision of a supportive work environment which enhances their pride and responsibility as a nurse and offers incentives is required with effective distribution of duties, development of the end of life nursing education and administrative tools for reducing their stress.

• Journal of Distribution Science
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• v.14 no.4
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• pp.67-79
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• 2016

Purpose - Over recent years, we have concerned about safety and quality on food products because of delivery complexity. The dependence of foreign food products escalate supply of products. And there are often negligent accident of marine and agricultural products. Therefore, the complexity increases the importance of safety on food and information quality for consumers. In spite of the interest augmentation of various interested parties, there is decrease in reliability and effectiveness, if it would be established without the right directivity. For the study, we tried to examine the first considerations the point of - view in service environment and information quality with accepting and diffusing the Traceability System. Then, we tried to verify the relationships between the factors of TS and the determinants of behavior decision. Next, we made efforts to find the mutual relationship among distributors, producers, consumers and the other prerequisite factors from the point of view in service environment and information quality in order to operate effectively the information perspective and system. Research design, data, and methodology - For the purpose of this study, the samples of consumers were targeted to Traceability System, and 661 people have been investigated. Through theoretical discussion of previous research, nine hypotheses were established, the influence of Continuous User Intention in TS. In order to test the hypotheses, a survey had conducted for 661 consumers as opinion leaders in their 20s-60s as data, and structural equation modeling was used. The difference analysis between Agricultural and Marine Products in TS; SPSS 22.0 and AMOS 22.0 were used for statistical analysis. Results - The major findings from this study were as follow; all factors of information quality excluding completeness and a social-impact had effects on the ease of use; all factors excluding understand ability in information quality and a social-impact had effects on the usefulness; completeness and social-impact had effects on perceived value; the ease of use had effects on usefulness and perceived value; usefulness had effects on perceived value and the intention of continuous use. From the results of different analysis, the CPLT(Completeness) factor has positive effects on Easy of USE and PV(Perceived Value) strongly in agricultural products. On the other hand, Social Duty has positive effects on Easy of Use strongly in marine products. Conclusion - In the age of information overflowing, TS will be a burden for users if it places too much emphasis upon accessibility. To accept and diffuse TS safely, therefore, Information System should be settled first into initial market formation. In addition, if TS elements are considered in conjunction with information factors and user environment, the acceptance and diffusion of TS would make synergy effect, even better. That is, this study contributes to the acceptance and diffusion of Traceability System. Accordingly, information quality will be settled into initial market formation. Also, social-impact element will be considered in conjunction with information quality's factors, and it will make synergy effect.