• Proceedings of the KIEE Conference
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• 2006.07c
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• pp.1502-1504
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• 2006

본 연구는 $SF_6$와 Dry-air(건조공기)가 혼합된 절연매체의 절연 특성과 부분방전 특성 연구를 위하여 기초실험용 쳄버와 70kV급 GIS mock up 을 이용하여 교류전압을 인가하여 실험이 수행되었다. 전자의 경우, Sphere gap 및 Needle/Plate 전극시스템을 이용하여 순수 $SF_6$가스와 Dry-air의 절연내력을 비교하고, 챔버의 압력을 5기압으로 유지한 상태에서 Dry-air와 $SF_6$가스의 혼합비를 변화시키면서 절연내력이 측정되었다. 후자의 경우, 기초실험에서 도출된 $SF_6$가스와 Dry-air의 최적의 혼합비율을 선택한 후, 방전 개시전압과 부분방전 양상을 순수 $SF_6$가스의 결과와 비교 분석하기 위한 실험을 수행하였다. 이를 위하여 GIS 사고의 주요원인이 되는 결함들, 즉 Protrusion, Floating, Free moving particle 들을 인위적으로 모의하여 Mock up 내부에 설치하고 내부 압력을 5기압으로 유지한 상태에서 수행되었다. 전자의 경우, $0.5{\sim}5$ 기압 범위내 에서 Dry-air 압력을 변화시켰을 때 절연내력은 전극시스템에 무관하게 순수 $SF_6$가스의 결과치의 $40{\sim}50%$정도이다. 또한 챔버 압력이 5기압일 경우, Needle/Plate 전극을 이용했을 경우, Dry-air 가 80% 혼합된 절연매체는 순수 $SF_6$가스 절연내력의 80%정도이다. 후자의 경우, 인가전압을 고정 시켰을 때, 부분방전 패턴과 방전크기는, 순수 $SF_6$가스와 Dry-air 가 80% 혼합된 절연매체는 동일한 패턴과 방전크기를 나타내고 있다. 이러한 결과를 근거로, 가스 압력이 5기압에서 운전되는 전력기기의 절연 매체로서 혼합가스를 사용할 경우, $SF_6$가스와 Dry-air의 혼합비는 2:8정도가 적절한 것으로 제안한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.15-15
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• 2015

기존 기후변화 영향평가 불확실성 연구들은 거의 대부분 GCM의 불확실성이 가장 크다고 결론내리고 있으나, ES 불확실성과의 정량적 비교는 하지 못했으며, 기존 접근방법은 민감도 분석 수준에 머무르고 있다. 이에 본 연구에서는 기후변화 영향평가 각 단계별 불확실성을 포괄적으로 정량화하고 수행단계별 불확실성의 전파정도를 추정할 수 있는 새로운 approach를 제안하였다. 첫째, 전체 불확실성, 각 단계별 불확실성 증가 정도, 각 단계별 불확실성의 비율을 제시할 수 있는 새로운 approach를 제안하였다. 또한 불확실성을 정량적으로 추정할 수 있는 방법으로 maximum entropy(이하 ME)를 선정하였으며, 이를 본 연구에서 제시한 approach에서 적용성을 살펴보았다. 둘째, 본 연구에서는 기후변화 영향평가 불확실성 단계별 정량화를 위해 2개 배출시나리오, 4개 GCM 시나리오, 2개 상세화기법, 2개 수문모형을 사용하여 기본적 기후변화 영향평가 단계를 모두 수행하였다. 기존 approach에서는 GCMs의 변화율(89.34)이 가장 커 GCMs의 불확실성이 가장 큰 것으로 나타났으나 제시한 approach에서는 배출시나리오의 불확실성이 전체 대비 58.66 %로 기후변화 영향평가에서 가장 큰 불확실성 발생 원인으로 파악되었다. 모형 불확실성에서는 GCMs의 불확실성(전체 대비 33.57 %)이 가장 높게 나타났다. 또한 배출시나리오의 ME는 3.32, GCMs의 ME는 5.22, 상세화기법의 ME는 5.57, 수문모형의 ME는 5.66으로 단계적으로 불확실성이 증가하였다. 다음으로 유량과 강수를 이용하여 불확실성 정량화를 수행하였으며, 강수를 이용한 불확실성 정량화에서는 유량을 이용한 결과와 다르게 배출시나리오 다음으로 상세화기법의 불확실성이 큰 것으로 나타나 어떤 수문변수에 초점을 두느냐에 따라 불확실성 정량화저감 노력 대상이 달라질 수 있음을 제시하였다. 마지막으로 자연변동성에 의한 불확실성이 기후변화 전체 불확실성의 45.47 % 정도로 나타났으며, 이는 미래 기후변화에 의해 발생하는 불확실성이 과거 자연변동보다 2배 이상으로서, 기후변화에 의한 미래전망의 불확실성이 매우 크게 증가한다는 매우 중요한 결과를 제시하였다.

• Journal of the Korean Society of Radiology
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• v.8 no.3
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• pp.105-110
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• 2014

Diagnostic radiation equipment diagnosis and treatment of disease of recent plays a central role, but this is based on the assumption of an appropriate balance of benefits and risks of diagnostic. If balance is not maintained has the potential to give an adverse effect on the health of the public. In the case of an overseas, the importance of (QA) quality assurance of medical equipment is growing, but evaluation criteria of quality assurance has not been clearly presented in domestic. Therefore, the modernization of medical equipment from the point at which the degree of cycle-by-cycle management system of foreign national to be suitable for diagnostic radiation generator entry and quality control standards by introducing a tailoring is necessary. In this study the most frequently used diagnostic radiation generator X-ray imaging apparatus of the general three-year periodic inspections at any time between the periodic inspection items and quality control methods and standards for the establishment of the United States, Canada and abroad, and international electronic literature search Technical Committee (International Electro-technical Commission, IEC) were compared with the provisions of item. Based on the national quality control items when opening frequent inspection items and standards presented as a basis for setting up study.

• Journal of The Korean Society of Grassland and Forage Science
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• v.37 no.4
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• pp.283-289
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• 2017

The present study was carried out to explore the potential effect of shading degrees on yields and nutritive values of forage in forest-grassland. This experiment was conducted this study under different natural shading at National Institute of Animal Science, Cheonan province in Korea, for 2 years (from 2015 to 2016). This experiment was consisted of four different shading degrees, such as full sunlight (control, 10% below), 25% of shading, 35% of shading, 50% of shading. Pasture species used in this study were orchardgrass 'Kodiwin', perenial ryegrass 'Linn', tall fescue 'Purumi', kentuky bluegrass 'Kenblue', and white clover 'Ladino'. Botanical composition of orchardgrass was higher than that of perenial ryegrass, tall fescue and kentuky bluegrass. Dry matter (DM) yields of forage decreased as increasing shading degrees. DM yields of forage significantly decreased as increasing shading degrees and lots of cutting times under increasing shading degrees decreased DM yields of forage. The content of crude protein increased as increasing shading degrees and the contents of acid detergent fiber (ADF), neutral detergent fiber (NDF), the activity of total digestible nutrient (TDN) and in-vitro digestibility (IVD), and relative feed value (RFV) were similar in control and different shading. This study suggests that orchardgrass is major component for forest-grassland and establishment of orchardgrass can be improved by increasing shading degrees.

• The Korean Journal of Pesticide Science
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• v.15 no.4
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• pp.529-544
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• 2011

Many international organizations, such as the International Organization for Standardization (ISO) and Collaborative International Pesticide Analytical Council (CIPAC), have published a guide to quality control requirements, proficiency testing and method validation for pesticide formulation. In general, proficiency testing is to determine the performance of individual laboratories from the comparison of test results and to monitor a laboratory's performance abilities. One of quality assurance (QA) scheme would be include the validation of analytical method that implies a performance characteristics, specificity, selectivity, linearity and so on. According to many international organizations, the quantification methods of active substance in formulated pesticide products are required to be reproducible, accurate and precise. This study was conducted to compare the international guidelines for the quality control, proficiency testing and method validation of analytical laboratories and to propose a general guidance for the establishment of quality control system in the analytical chemistry laboratories of pesticide formulation in domestic.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.220-227
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• 2016

This descriptive study was conducted to investigate the relationship between clinical practice stress, satisfaction with clinical practice, and clinical performance ability of nursing college students and the nursing profession. Data were collected from 240 students in the nursing college. Clinical performance ability (F=1.888, p=0.048) and the nursing profession (F=1.976, p=0.046) showed statistically significant differences depending on the satisfaction of majors. The nursing professional institution contained more population groups that were dissatisfied than satisfied with the majors. Additionally, clinical practice stress was reported to affect satisfaction by 41% of the respondents. Overall, stressful clinical practice, clinical practice satisfaction and clinical performance were found to significantly affect the degree of satisfaction by nursing students. Accordingly, the level of stress experienced during clinical training also affects the performance of clinical practice, and can therefore lead to mistakes. Thus, there is a need to develop future interventions that could reduce the stress experienced by clinical practice nursing students.

• Journal of Technology Innovation
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• v.26 no.2
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• pp.129-149
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• 2018

Technology finance is an area in which financial authorities have introduced and implemented a strong policy will for the advancement of the financial industry and the development of SMEs. As a result, the Bank's own technology evaluation was conducted from September 2016. Technically superior companies are upgrading their credit ratings, and as a result, they benefit from financial transactions as much as their higher credit ratings through technology evaluation. Based on the data generated during this process, we analyze the degree to which credit ratings was upgraded by technology evaluation. The pre study handles 406 data from KEB Hana Bank's technology evaluation conducted in the second half of 2016. As a result of combining the credit rating with the calculated technology rating, J58 'Publishing Activities' technology-credit rating is raised by 1.05 rating, which is the highest, and C10 'Manufacture of Food Products' is the second highest. As a result, we were able to identify the sectors that benefited from the technology evaluation and confirmed the usefulness of technology evaluation by industry(KSIC). To expanding the study, 2,719 companies evaluated during the entire period were analyzed by technology grade, business experience and promising growth industry code. As a result of the analysis, technological power over T-4 grade companies had the highest credit rating upgrades. The companies belonging to promising growth industries designated for efficiency of policy support, it is confirm that the support of the promising business type was useful because the credit grade was upgraded through technology evaluation. The validity of the technology evaluation based on the five-year business experience was found to be insignificant. In the future, it will be possible to maximize the support effect by concentration on the companies with over T-4 grade and growth potential companies when supporting SMEs.

• The Journal of the Korea Contents Association
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• v.13 no.8
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• pp.324-333
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• 2013

The purpose of this study was to investigate the need of home modification for outpatient with stroke and spinal cord injury. The subjects of this study were 54 outpatients who have experience in rehabilitation therapy at hospitals in Seoul and Gyeonggi-do. A questionnaire was distributed and collected form January 2th to February 4th, 2012. Descriptive statistics and $x^2$-test were used to analyze data. There were statistically significant difference in stairs of access, in width of front door, in bathroom, space of room according diagnosis. There were statistically significant difference in light of sensor, tissue holder and socket cover in bathroom for the comparison of demands for home modification by living type. There were statistically significant difference in width and threshold of front door, tissue holder and towel bar, nonslip floor in bathroom, space and table, chair of kitchen, space and threshold of porch, light for the comparison of demands for home modification according score of MBI. Based on the results of the survey, needs of home modification is different according disability level, diagnosis, living type, ADL performance. The results of this study show a need for the further occupational therapy of home modification and supporting policies in home modification.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.11
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• pp.463-473
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• 2016

The purpose of this study was to investigate the relations between the cognitive functions, health conditions, activities of daily living, depression and sleep states among the elderly at care facilities. The subjects include 204 elderly people aged 65. The data collected were analyzed using descriptive statistics, the t-test, ANOVA, Pearson correlation, and hierarchical multiple regression. The findings show that the cognitive functions of the elderly at care facilities are related to their engagement in regular exercise, duration of residency, grade of care, lack of physical freedom, listening ability, state of teeth, urinary incontinence, activities of daily living, and state of sleep. Their cognitive functions had positive correlations with activities of daily living and negative correlations with state of sleep. Their cognitive impairment was significantly influenced by their engagement in regular exercise, duration of residency, grade of care, listening ability, ADL, IAD dependency, and sleep disorder. In short, the cognitive functions of the elderly at care facilities are highly related to their health conditions as perceived and felt by them. It is thus required to develop, apply, and consistently assess and manage cognitive rehabilitation training programs to provide interventions for the factors that influence their cognitive impairment.

• The Korean Journal of Pesticide Science
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• v.16 no.4
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• pp.350-356
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• 2012

Performance of proficiency testing and the validation of analytical method was included a scheme of quality assurance in analytical chemistry laboratory to monitor a laboratory's performance abilities and produce consistently reliable data. This study was assessed the applicability of proficiency testing scheme proposed for analytical laboratories of pesticide product in domestic. The validation of analytical methods, stability and homogeneity for formulated pesticide products (emulsifiable concentrate) of emamectin benzoate and lufenuron was confirmed for the proficiency testing. The z-score of 33 participation laboratories for emamectin benzoate were that the numbers of outlier were 2 laboratories (6.0%), z-score outside the range from -3 to 3 designated "unaccptable" were 2 laboratories and z-score in the ranges -2 to -3 and 2 to 3 designated "questionable" were 3 laboratories (9.0%). Three laboratories (9.0%) showed the z-score designated "questionable" for lufenuron. The additional proficiency testing for various product types will be needed to establish the scheme of quality control.