• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권12호
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• pp.649-654
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• 2003

The simplest method for measuring output currents of the three phase inverters is to measure them with three current sensors such as hall sensors. This method requires at least two current sensors, and these types of sensors are somewhat expensive. More economical method is measuring DC link current with a simple shunt resistor, then, reconstructing output current using the DC link current value and the switching status. However, in low speed region, the measurement becomes difficult and even impossible due to the requirement of minimum switching duration for A/D conversion. These problems can be overcome by limitation of switching duration. Limitation of switching, however, causes voltage and current distortion. Owing to compensation, distortion can be effectively suppressed. However these increase acoustic noise due to increment of current ripple. In this paper, a current measurement method is proposed, which can reduce minimum switching duration resulting in reduction of acoustic noise. The validity of proposed method is confirmed through experiment.

• 한국식생활문화학회지
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• 제20권5호
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• pp.525-531
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• 2005

This study was carried out to establish the consumer-centric food labeling system by investigating usage state, importance evaluation, problems and satisfaction, etc. on the current food labeling system by consumer. For usage state of checking the food label, 50.2% of respondents were replied ‘mostly check the label’, and they were indicated a significant difference on ‘education level(p<.05)’, and in case of married respondents, most were relied 'absolutely check the label', For the reason to check the food label, 61.8% of respondents were replied 'to determine whether it is stable or not', and they were indicated a significant difference on age(p<.01), marital status(p<.01), and job(p<.01). For the item considered as important things on the label of the whole food, 49.8% of respondents were replied that 'expiration and manufacture date is important', and they were indicated a significant difference(p<.001) on age, marital status, job. For item considered as important things on the label of each food, it was indicated that they considered food company as important thing in case of snack, soft drink, edible oils, and noodles, and food company in case of ice cream, and expiration and manufacture date in case of milk product and meat product. For the problems on the current food labeling system, the clauses 'Poor marking on food additives and materials contents' and 'untrue marking of nutrition contents' were indicated a significant difference on age(p<0.05, p<0.001), and the clause 'untrue marking of nutrition contents' were indicated a significant difference on marital status(p<.01) and job(p<.01).

• The Plant Pathology Journal
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• 제17권1호
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• pp.1-8
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• 2001

The technique of plant transformation has started to show off its great power in the area of plant breeding by commercially successful introduction of transgenic varieties such as herbicide tolerant soybean and insect resistant corn in USA with an unimaginable speed. However, in contrast with the great success in the commercialization of herbicide tolerance and insect resistance, the transformation works on disease resistance has not yet reached the stage of full commercialization. This review surveys the current status of molecular breeding for plant disease resistance and their limits and problems. Some novel ideas and approaches in molecular breeding for disease resistance are introduced.

• 한국치위생학회지
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• 제20권6호
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• pp.865-874
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• 2020

Objectives: This study aimed to analyze the current status and educational contents of the geriatric-related curriculum in dental hygiene departments at colleges across the country. Methods: To analyze the current status of geriatric curriculum, it was investigated by searching the websites of colleges across the country where dental hygiene (curriculum) department was available. Furthermore, a literature review of domestic and foreign textbooks related to geriatric dental hygiene was conducted to analyze the contents of geriatric dental hygiene curriculum. Results: Among colleges that offer dental hygiene (curriculum) department, 8 four-year and 12 three-year colleges (24.4%) offered geriatric dental hygiene courses. A comparison of the contents of the textbooks titled "Geriatric dental hygiene" published by Goonja, Daehan Narae, and Komoonsa showed that basic contents such as the characteristics, health problems, and oral health problems of elderly -people were described in the same context. However, there was a difference in the volume and importance of the concerned contents also. Conclusions: Universities and related organizations which offer dental hygiene curriculum should continue to conduct studies for the development of geriatric hygiene curricula. Moreover, heightened efforts are needed to ensure that geriatric dental hygiene education is more systematically offered.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 하계종합학술발표회논문초록집
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• pp.431-431
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• 2004

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.553-554
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• 2007

This paper proposes the method to increase the current direct load control program by inspecting the problems of the DLC program. In order to increase the number of the customers participating DLC program, a raise of the base incentive and the direct load control incentive is suggested based on the interruption cost of electric power considering the characteristics of kinds of load.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제10권1호
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• pp.1-10
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• 2007

Outcome of liver transplantation for children with end liver disease has been improved markedly during last two decades. Improvement of immunosuppressive agent and its strategy to use in children, development of innovative surgical technique, and better understanding of the course of liver transplantation attributed to better outcome of pediatric liver transplantation. Therefore this review article will focus on the problems which can occur during pre- and post-transplantation period, current strategy to use immunosuppressive agent for the better understanding of pediatrician who is not involved in transplantation but takes care of the children pre- and postoperatively.

• 농촌지도와개발
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• 제8권2호
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• pp.263-271
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• 2001

The purpose of this study were to review the current problems of rural welfare and to suggest desirable direction for development of welfare in rural Korea. Specific objectives of the study were to investigate the current status and problems of rural welfare and to search for the desirable directions for rural welfare development in Korea. The major findings of the study were as follows ; 1. Some of the current problems of rural welfare were; (1) difficulty in getting a job for stable income, (2) seriousness of medical care and aging of rural population, (3) decrease in number of rural school children and unfavorable educational environment, and (4) insufficiency in facility, manpower and program for recreation and cultural activities in rural area. 2. Problems of rural welfare were not independent in rural Korea, but the most of the problems were interrelated to each other. Integrated and comprehensive approach would be necessary to solve the problems of rural welfare. 3. Clean environment, stable and rewarding life, pride and self esteem of rural occupation should be the goals of better integrated rural welfare development, and healthfulness and quality of life should be ensured in rural society. 4. Urban oriented national policy based on urban centered political power was one of the causes of under development in rural welfare by creating rapid decrease in rural population and aging. Various problems in economic, educational, cultural and medical aspects of rural society should be solved. Further research on rural welfare should be conducted to increase and to strengthen rural welfare development in Korea.

• 한국의상디자인학회지
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• 제15권3호
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• pp.199-211
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• 2013

Glasses industry has great growth potential from the future-oriented perspective in Korea. In consideration of the fact that the ratio of aging population increases in this aging society, people have more and more interest in health. Also, their recognition on the cycle to change glasses is changing, and the utility of them as fashion items is increasing day by day, it is expected that the demand for glasses will be even more extended afterwards. Of course, presently it suffers from the gap between cheaper items and expensive ones provided by overseas prominent brands due to the bi-polarization of the market. However, they are pursuing the 2nd growth as export-leading items in the past through international glass exhibitions based on knowhow accumulated for a long time. Therefore, this study aims to examine the current status of glasses design industry in Korea reflecting the actual situations we have now and also understand the problems and limitations internalized in our glass design industry through the research process. As a result, the study has drawn the following conclusions. This paper intends to point out first, the phenomenon of bi-polarization of the glass market in Korea. Second, unequal distribution by region centering around Daegu. Third, the limitations of brand identity. Fourth, the limitations of information, planning, and marketing power. Fifth, passive conduction of international events and their insufficient effects. This study concludes that all these problems can be solved through 'planning and design, and marketing power'.

• 한국도서관정보학회지
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• 제43권4호
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• pp.317-346
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• 2012

이 글의 목적은 우리나라 대학도서관정책의 외형과 속내를 들여다 보면서, 현재 대학도서관계가 당면해 있는 문제의 본질과 원인을 정책적 관점에서 밝혀내고, 향후 대학도서관정책의 건강성을 회복하기 위해 선결해야할 과제에 대해 논의하는데 있다. 이를 위해 이 연구에서는 첫째, 우리나라 대학도서관정책의 문제점을 정책의 로드맵인 '발전계획' 등을 통해 세밀히 검토하고, 둘째, 문제의 원인을 정책의 근간인 관련 법규와 제도, 정책추진체계의 핵심 요소인 정책기구, 행정조직, 전문직 단체 등의 역할과 기능을 통해 분석하며, 마지막으로, 우리나라 대학도서관정책이 제대로 서려면 정책의 내용과 추진체계에 있어 어떠한 개선책이 필요한지에 대해 제언하고 있다.