• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제51권2호
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• pp.62-67
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• 2002

This paper provides the results of accelerated aging test of 18kV ZnO lightning arresters to investigate the leakage current characteristics. It was impossible to establish the replacement criterion for field operating lightning arrester because conventional aging test was only focused on the aging of ZnO elements. In general, it is possible to replace the aged arresters before the failure in the field using the leakage current measurement because it must be increased by the aging. But we can not use the method because we don't know the characteristics of the installed lightning arresters. Therefore in this paper we applied operating voltage and accelerating cycle which consists of temperature and humidity to the arresters. Then we measured the variation of total and resistive leakage current and found out the characteristics of the acted lightning arresters.

• 한국작물학회지
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• 제41권6호
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• pp.656-664
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• 1996

광산, 진주와 밀양에서 수확된 사천006, 두산12 호와 두산2002 종자를 인위노화시켜 종자세를 조절하였다. 이들 종자로서 표준발아검사(standard germination test), 저온발아검사(cold germi-nation test), 전기전도도검사(electroconductivity test)와 Tetrazolium 검사(TZ vigor test)를 실시하여 포장출아율 및 수량과의 관계를 구명하고자 하였다. 9가지 seed lot을 이용한 맥주보리의 포장출아율 예측에는 표준발아검사에서의 발아율만으로 65%의 예측효과가 인정되었고 표준발아검사에서의 유묘세와 저온발아검사에서의 유묘세와 발아율 parameter 또한 효과적인 방법임을 다중회귀분석으로 알 수 있었다. 수량 예측에는 TZ검사에서의 종자세 지수와 표준발아검사에서의 발아율과 TZ검사에서의 예측발아율이 효과적 인 parameter임을 알 수 있었다.

• 한국실내디자인학회논문집
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• 제24권3호
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• pp.165-175
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• 2015

Korean medical welfare facilities for the elderly provide the conveniences to care geriatric illness such as dementia and stroke. The medical welfare facility categorizes elderly care facilities, nursing homes, and geriatrics hospitals based on the Korean welfare of the aged act. The government makes an effort to secure feed rate and finances of medical welfare facilities. However, the qualitative improvement of facilities is inadequate. The purpose of this study is to analyze the conditions and problems of existing facilities using an environmental evaluation and to discuss the improvement direction related to the daycare centers for the elderly. The method of this study is literature review and field survey. Firstly, we analyzed the previous studies to develop the tool, evaluating the environment of day care centers for the old. Secondly, the items of environmental evaluation are deduced. Thirdly, we select the facilities to conduct field survey and analyze the results of field survey. Lastly, We discussed the problems and improvement directions through the results. It is judged that this study is an useful as the basic guideline to strengthen the minimum legal standards of day care center for the elderly due to the suggestion of insufficient environmental evaluation items.

• 대한영양사협회학술지
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• 제15권2호
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• pp.113-127
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• 2009

This study was conducted to evaluate the sanitary performance and education of middle and high school foodservice employees in Seoul, South Korea in order to ensure the foodservice safety and identify why some employees cannot apply learned knowledge in real work situations. Subjects consisted of 217 school foodservice employees who attended a regular sanitary education program under the auspices of the Seoul Gangdong and Gangseo district offices. The sanitary performance was assessed with 5 dimensions (personal hygiene, ingredient control, process control, safety management and sanitary education), and was self-evaluated using a Likert 5 point scale. The data were analyzed using the SPSSWIN Version 12.0 package. The main results of the study showed that according to the general characteristics of middle and high school foodservice employees, 98.2% of respondents were women, and 64.1% of them aged 40-49. A total mean score of 5 items of sanitary performance for middle and high school employees was 4.74. Ingredient control field score was 4.83, process control 4.80 and personal hygiene 4.74. In contrast, the sanitary education field score was 4.56, significantly lower than the total mean score. Safety management field score was 4.71. Verbal education was the main method performed as a sanitary education in schools.

• The Journal of Asian Finance, Economics and Business
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• 제8권12호
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• pp.191-201
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• 2021

The objective of this research is to investigate how the board of directors' characteristics influence sustainability disclosures with the mediating effect of corporate governance. The independent variables are the characteristics of the board of directors, which consist of the presence of women on the boards, presence of directors aged over 50 years old, education level, education field, board tenure, and compensation. The dependent variable is sustainability disclosures, which is measured by the GRI standard disclosure, whereas the mediator variable is the CG score. Research samples are 460 companies listed on the Stock Exchange of Thailand (SET). Path Analysis is used to examine the correlation between the board of directors' characteristics, CG score, and GRI standard disclosure. The research findings show that senior boards, the education field, and compensation motivation have an effect on sustainability disclosures, whereas corporate governance is a mediator of the effect of the education field of boards on sustainability disclosures. This finding should help shareholders to choose individuals with suitable characteristics to serve on the board of directors, and, as a result, shareholders should anticipate a profitable result to be generated, while the business of the company is conducted in a sustainable way.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.589-592
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• 2008

최근 구조물 품질관리 중요성이 높아짐에 따라 구조물의 피해 없이 품질평가가 가능한 비파괴시험의 사용이 증가하고 있다. 하지만, 다양한 현장조건에 대한 경험 및 이해가 충분치 않아 아직 실내 연구개발에 중점을 두고 있는 경우가 많다. 본 연구는 초음파 탐사법의 현장 적용성을 평가하기 위하여 현장 제작 후 증기양생 된 PC보에 본 기법을 적용하여 보았다. 현장 조건과 동일한 조건에서 양생된18개의 실린더를 제작하여 재령 60일까지 재료특성 변화를 관찰한 후, 이를 제작 후 인장작업 전의 34개의 PC보에서 측정한 초음파속도와 비교하였다. 측정 결과 현장 타설된 PC보의 압축강도 및 탄성계수를 합리적 범위 내에서 초음파탐사법을 사용하여 추정할 수 있었다. 하지만, 초음파 탐사법의 신뢰도를 높이기 위해서는 현장 조건에 대한 고려가 선행되어야 할 것이다.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2013년도 춘계학술대회 논문집
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• pp.79-80
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• 2013

The purpose of this study was to investigate $2^{nd} $nanotube formed surface observation of the Ti-25Ta-xZr alloys using ATO(anodic titanium oxide) technique. Ti-25Ta-xZr alloy was anodized in 1M $H_3PO_4$ electrolytes containing 0.8 Wt. % NaF at room temperature. After formation of nanotube was achieved out, nanotube was eliminated, and then anodization was carried out repeatedly. The microstructures, phase transformation, and morphology of nanotubular Ti-25Ta-xZr alloys and process of nanotube growth by using ATO method was examined by optical microscopy (OM), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM). The ${\alpha}$ phase and ${\beta}$ phases were affected to form the second nanotube morphology of Ti-25Ta-xZr alloys.

• 한국대기환경학회지
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• 제26권1호
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• pp.21-33
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• 2010

The objective of this study was to estimate the $PM_{2.5}$ source apportionment at the Pinnacles National Monument IMPROVE site in western coastal USA. The PMF was applied to identify the existing sources and apportion the $PM_{2.5}$ mass to each source. To analyze local source impacts from various wind directions, the NPR analysis was performed using source contribution results with the wind direction values measured at the site. Also, PSCF was applied to identify the locations by point sources relative to the back trajectories. A total of 1,634 samples were collected from March 1988 to May 2004 by IMPROVE sampler and 32 chemical species were analyzed by PIXE, PESA, XRF, IC, and TOR methods. The PMF modeling identified seven sources and the average mass was apportioned to gasoline vehicle, secondary sulfate, aged sea salt, secondary nitrate, wood/field burning, diesel emission, and soil, respectively. In this study, the average mass was apportioned to gasoline vehicle (33.0%), secondary sulfate (25.7%), aged sea salt (17.8%), and secondary nitrate (10.1%). Also, this study suggests the possible role for source apportionment study of $PM_{2.5}$ at similar areas such as wildness, national park, and coastal areas in Korea.

• 아동학회지
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• 제34권2호
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• pp.139-160
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• 2013

The purpose of this study was to examine the difference in perception among parents of preschoolers, parents of school aged children, teachers of child care centers and elementary school teachers regarding testing on the level of preparation for attending elementary school. Firstly, the results of the study revealed that elementary school teachers had notions regarding the level of preparation for entering school that were more specific than day care teachers and parents. Second, it was shown that effort and a sense of responsibility were most important for the improvement of the level of preparation for elementary school level studies. Third, the results of this study revealed that many respondents thought that there needs to be some form of testing of the level of preparation for school and the respondents further stated that this testing needed to be conducted by child care center teachers or experts in the field. Finally, it was shown that such a test of the level of preparation for school attendance should be developed by including questions on different areas of the intelligence, adaptability, function, tendencies and regulations in relation to the needs of preschoolers.

• 대한임상검사과학회지
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• 제44권4호
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• pp.178-183
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• 2012

We investigated the latest trend of u-Health and relations with clinical technologist. Since 2000, Korea has become an aging society. Korea will become an aged society by 2018, and it is expected to enter the ultra-high aged society by 2026. Increase in over 65 years population means that the desire of medical service and care demand for the elderly is greatly required. In addition, many predicted Korean national health insurance would falter financially. Medical suppression policies and regulations are also amended continuously. U-Health based on the IT industry and development of related technologies and industries contains the variety concepts of telemedicine, telehealth, e-health, u-healthcare and POCT. Especially, the use of POCT supplied quick clinical examination is extending steadily in medical center and hospital, which will generate the field friction between nurses and medical technologists. In the transition situation from provider-centric service to consumer-driven health care system, this study recommended the principal role and correspondence of clinical laboratory workers and offered information about changes in healthcare market and the basic concept of expert system, measurement and the diagnosis principle to clinical technicians throughout the investigation of the recent research and government policy trends.