• 전력전자학회논문지
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• 제10권3호
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• pp.274-281
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• 2005

압전소자를 에너지원으로 사용하여 자립형 전기전자시스템에 에너지를 공급하는 에너지 획득(Harvesting) 개념의 구현을 위하여, 새로운 AC/DC 공진형 펄스 컨버터를 제안한다. 컨버터는 정류기와 DC 컨버터의 2단계로 구성되었으며, AC/DC 변환을 위한 정류기는 MOSFET의 3상한 동작 특성을 이용하여 구현하고, N형 및 P형 MOSFETs을 사용하여 DC/DC 부스트 컨버터를 구현하였다. 제안된 컨버터 시스템의 동작원리 및 동작모드를 스위칭 소자의 기생캐패시턴스를 고려하여 해석하고, 시뮬레이션을 통하여 해석결과를 검증하였다. CMOS IC 칩으로 제작된 본 시스템의 실험 결과는 수십 uW 용량에서 에너지 획득 개념의 구현 가능성을 제시하였다.

• The Journal of Asian Finance, Economics and Business
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• 제7권4호
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• pp.317-324
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• 2020

The study aims to analyze the theoretical background of the economic growth and sustainable development; systematization of scientists view on monitoring and economic and innovative evaluation, analysis and diagnosis of factors affecting these processes. Rating characteristics of the level of innovative resources development obtained based on the comparative analysis of Kazakhstan regions. Calculations were done based on official statistics during 2010 and 2015-2017. Based on obtained data there has been grading of the country regions and their ratings were determined by the level of development of innovative resources. This research identifies areas and mechanisms to ensure balanced sustainable development of the national economy. The findings suggest that sustainable development of the state is affected by the innovative activity of the regions, the sustainable development of which is ensured by innovative enterprises. Transition to the model of sustainable territorial development involves the formation of such conditions and the use of mechanisms under which the natural base of this development is not destroyed, the environment suitable for human existence is preserved and reproduced. The findings of this research support for pursuing a national policy of reducing regional imbalances, and promoting a more balanced and sustainable development of the whole country.

• Restorative Dentistry and Endodontics
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• 제43권1호
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• pp.13.1-13.7
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• 2018

Dental erosion is frequently overlooked in clinical practice. The management of erosion-induced damage to the dentition is often delayed, such that extensive occlusal rehabilitation is required. These cases can be diagnosed by a careful clinical examination and a thorough review of the patient's medical history and/or lifestyle habits. This case report presents the diagnosis, categorization, and management of a case of gastro-esophageal reflux disease-induced palatal erosion of the maxillary teeth. The early management of such cases is of utmost importance to delay or prevent the progression of damage both to the dentition and to occlusal stability. Non-invasive adhesively bonded restorations aid in achieving this goal.

• Nuclear Engineering and Technology
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• 제33권4호
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• pp.441-456
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• 2001

ABB-CE＇s regionalization methodology for the core inlet flow distribution map is reviewed. This methodology merges the test data of fuel assembly locations which are either in symmetry or strongly correlated with others. It increases the number of available test data for each regional flow factor It makes up effectively for the deficiency due to limited number of test data. It also contributes to making the core inlet flow distribution smoother not only locally but also over the entire core, and to relieving the impacts of test errors that may happen due to some do- calibrated local pressure measurement taps. As a result, the core inlet How distribution data becomes more statistically useful and thus the conservatism involved in handling the core inlet flow factors for the thermal margin analysis is expected to be reduced. Meanwhile, the regionalized map may lose the unique local characteristics in core inlet flow distribution too much. By an alternative approach introduced in the present work, it is shown that such a disadvantage can be mitigated somewhat if the engineering judgement is made more

• 통상정보연구
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• 제15권1호
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• pp.309-330
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• 2013

4개 국가의 지역 무역협정으로 시작된 환태평양연대협정(TPP)은 미국의 적극적 참여와 일본이 참여 의사를 밝히면서 거대규모의 무역협정으로 확대되었다. 한국은 아직 유보적인 입장이지만 미국의 꾸준한 요청과 아시아 태평양 지역을 아우르는 규모를 감안하여 참여를 타진할 것으로 생각된다. 미국이 주도하는 TPP의 협정내용은 기존에 체결된 FTA를 기반으로 하여 구성될 것으로 예상되고 있다. 꾸준한 발전이 기대되는 전자상거래 분야는 이를 선도하고 있는 미국이 자신들이 유리한 부분을 적극적으로 제시할 것으로 예상되는 바, 한국이 참여한다면 한 미 FTA 등의 기존 협정 분야에서 우리에게 유리했던 부분 등을 적극 제시하고 향후 한국이 전자상거래 시장을 선도하는 방향으로 협상에 임하는 것이 중요하다.

• 가정간호학회지
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• 제29권1호
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• pp.40-49
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• 2022

Purpose: This study aimed to analyze the effects of fatigue, resilience, and self-leadership on nursing service quality of local medical center nurses who nursed COVID-19 patients. Methods: The participants were 135 nurses who worked at regional public hospitals located in H-gun, G, and C-city in province C. The collected data were analyzed using descriptive statistics, t-test, analysis of variance (ANOVA), Pearson's correlation coefficients, and stepwise multiple regression using IBM SPSS Statistics version 25. Results: The participants' nursing service quality showed significant positive correlation with resilience (r=.53, p<.001), and self-leadership (r=.60, p<.001). The factors affecting participants' nursing service quality were commitment to self-leadership (β=.57, p<.001) and work position (chief nursing officer) (β=.26, p<.001), which explained 42% of the participants' nursing service quality. Conclusion: During a crisis such as the COVID-19 pandemic, it is necessary to help nurses enhance their self-leadership skills and build their career continuously by developing relevant policies, systems, and nursing intervention programs. Future studies could expand the knowledge base by including more participants to explore other ways to improve nursing service quality during the COVID-19 pandemic.

• 유통과학연구
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• 제19권8호
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• pp.13-24
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• 2021

Purpose: This research is aimed to explore factors affecting on Kazakhstan's pharmaceutical distribution industry, selection of various factors and assessment of the level of their influence. Based on the literature review it was defined that there is a great variety of scientific works relating to pharmaceutical distribution industry competitiveness and management improvement. Research design, data and methodology: There is very little research, which to determine the issues of pharmaceutical industry distribution in developing countries, in particular EAEU countries. The algorithm was chosen for research provision: statistical and comparative analysis, correlation, and regression analysis. The data of 1993-2020 obtained from the World Bank, Bureau of National Statistics, National Bank of Kazakhstan, which is expressed by 19 factors as macroeconomic indicators. Results: The chosen variables were selected non-randomly, these economic indicators had the most reliable, unique, and utmost for the whole research period complete information. Conclusions: There could be made adequate conclusions of the research, there is a strong positive relationship for six factors: population, GDP per capita, average annual US dollar exchange rate, the minimum pension, average assigned monthly pension, minimum wage. Pension and wage are the most significant factors affecting on the pharmaceutical distribution industry in Kazakhstan.

• 대한설비공학회지:설비저널
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• 제14권3호
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• pp.187-199
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• 1985

The low-temperatured radiant heating System like a panel heating system is recognized as nice means to make comfortable indoor environment. Perhaps, 'Ondol' would be a typical example of the Panel heating system. Nevertheless. Occupants in a radiantly heated Space which has an asymmetric radiant field may feel thermally discomfort due to the asymmetric radiation. The aim of this Study is to suggest the fundamental technical data for establishing Standards of thermally comfortable environment when designing a radiant heating System. Thermal distribution of indoor environment and the skin temperature of the occupants were measured at experimental room in KIER (Korea Institute of Energy and Resources). Whole/Regional thermal and comfort Sensation votes of the occupants were taken simultaneously in order to investigate the relationships between thermal environmental factor and the occupants' responses. The effect of an asymmetric radiation on thermal environment and the occupants' responses was analyzed by using a v.r.t.(vector radiant temperature). By this means, the thermally neutral limits for the ambient air temperature and the floor surface temperature by the occupants' responses were Obtained. And the recommended temperature limits of the indoor surface were derived from the experimental work and the theory of radiant and will provide thermal neutrality for man without any discomfort on the part of the body.

• Advances in nano research
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• 제16권1호
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• pp.91-109
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• 2024

Carbon nanotubes are drawing wide attention of research communities and several industries due to their versatile capabilities covering mechanical and other multi-physical properties. However, owing to extreme operating conditions of the synthesis process of these nanostructures, they are often imposed with certain inevitable structural deformities such as single vacancy and nanopore defects. These random irregularities limit the intended functionalities of carbon nanotubes severely. In this article, we investigate the mechanical behaviour of double-wall carbon nanotubes (DWCNT) under the influence of arbitrarily distributed single vacancy and nanopore defects in the outer wall, inner wall, and both the walls. Large-scale molecular simulations reveal that the nanopore defects have more detrimental effects on the mechanical behaviour of DWCNTs, while the defects in the inner wall of DWCNTs make the nanostructures more vulnerable to withstand high longitudinal deformation. From a different perspective, to exploit the mechanics of damage for achieving defect-induced shape modulation and region-wise deformation control, we have further explored the localized longitudinal and transverse spatial effects of DWCNT by designing the defects for their regional distribution. The comprehensive numerical results of the present study would lead to the characterization of the critical mechanical properties of DWCNTs under the presence of inevitable intrinsic defects along with the aspect of defect-induced spatial modulation of shapes for prospective applications in a range of nanoelectromechanical systems and devices.

• 농촌지도와개발
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• 제13권1호
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• pp.29-47
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• 2006

The objectives of this study were to explore rural elderly's perception on rural area as a proper place to live for the elders and to find out their residential satisfaction and its related variables. The data were gathered through the questionnaire survey from 241 rural elderly over 70 aged living in Gyeonggi province during July 2005. The major findings of this study were as follows: 1) Those who are men, having experience living in urban area, and favorable perception to social relation with other residences prefer the rural area to urban area as living place for the elderly ; 2) Those who are subjectively perceived healthy and favorable perception to social relation with other residences tend to be in higher residential satisfaction than other groups ; 3) Such variables as age, educational background, living term in community and urban area were not significant to rural elderly's perception on rural area as a proper place to live for the elders and residential satisfaction; 4) Such variables as identification as community residences, people-oriented personality, sex and having experience living in urban area explained 26.4% of variance in rural elderly's perception on rural area as a proper place to live for the elders ; 5) Such three variables as identification as community residences, relationship with the primary group and age explained 55.2% of variances in residential satisfaction; 6) In shortly, the most influential factor to rural elderly's perception on rural area as a proper place to live for the elder and residential satisfaction was their identification as community residences.