• KEPCO Journal on Electric Power and Energy
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• 제8권1호
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• pp.5-7
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• 2022

KEPCO's plan is undergoing a trial operation to replace the open-loop section with ring main units configuration where underground distribution lines are installed, by linking the multi-way circuit breakers auto (MCA) on the power side of each pad-mounted transformer. However, ring main units application mentioned above may cause the ripple effects, when implementing the configuration without a study of protection coordination. Because ring main units with classical pre-set protection devices contribution in fault condition didn't consider yet. For the reliable ring main units operation, it is necessary to resolve several protection issues such as the protection coordination with substation side, prevention of the transformer inrush current. These issues can radically deteriorate the distribution system reliability Hence, it is essential to design proper protection coordination to reduce these types of problems. This paper presents a scheme of ring main units' configuration and MCA's settings of time-current curves to preserve the performance of protection coordination among the switchgears considering constraints, e.g. prevention of the ripple effects (on the branch section when a transformer failure occurs and the mainline when a branch line failure occurs). It was confirmed that the propagation of the failure for each interrupter segment could be minimized by applying the proposed TCC and the interrupter settings for the MCAs (branch, transformer). Further, it was verified that the undetected area of the distribution automation system (DAS) could be supplemented by having the MCA configurated ring main units operate first, instead of the internal protection equipment in the transformer such as the fuse, STP when a transformer failure occurs.

• International Journal of Human Ecology
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• 제17권1호
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• pp.39-51
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• 2016

This pilot study examined programs for early childhood education and care in three Chinese cities. The samples for this study were one university-based kindergarten, one private kindergarten (rural area), and one public kindergarten (urban area). Six types of instruments were used to assess early childhood education and care services regarding quality matters. Most questions asked were open-ended; consequently, the interview answers by kindergarten directors or teachers (as well as observations made by the researcher) formed the basis for collecting the data. Quality components for each program were determined by a comparison method. The comparison allowed the researcher to understand the range of quality education and care available as well as the variability of existing kindergarten programs in China. The findings of the investigation revealed important information on; (a) demographic information (fees, class hours, total weeks of class, vacation, number of children and staff, class size, and teacher-child ratio) (b) teacher characteristics, (c) health practices, (d) safety practices, (e) work environment, (f) physical settings, (g) play materials, (h) parent involvement, (i) nutrition, (j) daily schedule. Implications within the Chinese context for quality practices and issues to further develop and strengthen early childhood education and care systems are discussed.

• 보건교육건강증진학회지
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• 제30권1호
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• pp.41-52
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• 2013

Objectives: Rural-urban differences in suicide have been observed in many settings. However, there has been little research addressing what factors can explain these differences. The purpose of this study was to analyze which compositional factors and contextual factors in local areas might be related to local suicide. Methods: The study design was cross-sectional. The data for 251 primary local governments on their age-standardized suicide mortality and their predefined indicators of compositional factors and contextual factors were obtained from Korean Statistical Information Service as of year 2010. Bivariate analysis including one-way ANOVA and chi-square test were used to identify the differences in local features by area type. Seven poisson regression models for each of total, males, and females were used to analyze which compositional and contextual factors were related to suicide. Results: There were differences in suicide between gu and goon in total, male, and female groups. For total, compositional factors including divorce and smoking rate, and contextual factors including financial independency, water and waterwaste coverage, and number of wastewater discharge factories were found to explain the urban-rural differences. Conclusions: This study provided some evidence that contextual factors at the local level as well as compositional factors are useful for predicting local suicide mortality.

• 한국조경학회지
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• 제23권1호
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• pp.157-173
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• 1995

Seowons were first established during the Koryo Dynasty and contain primate shrines for the service of ancestors and ancient sages. Seowons were located in a scenic or rural place some distance from a residential area. The direct motive for building the Seowon came from the need for transcendental concealment and evasive retirement which developed as a result of oppression of scholars The indirect motivations were the development of loaming in an idyllic natural settings and the creation of a beautiful natural environment. he purpose of tai study is to investigate the characteristics and transformation process of the location of Seowon in the Chosen dynasty. The results of this research are summarized as fellows : 1. Seowons were in hilly areas with good geographical features including a nice view of the mountains and waters. Beowons were also built on the relation place of an ancient sage and of destroyed Buddist temples. 2. The location patterns of seowon in the Choson dynasty underwent three stages with the change of time Political and social phenomena influenced the transformation of the location patterns Research in this area is at an early stage. The present study was confined to an examination of 7he characteristics and transformation process of the location of seowons. However, it is hoped that this study will offer meaningful guide for further research.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.71-76
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• 2006

With the rapid development of spatial infrastructure in US, Europe, Japan, China and India, there is no doubt that the next generation Global Navigation Satellite System (GNSS) will improve the integrity, accuracy, reliability and availability of the position solution. GNSS is becoming an essential element of personal, commercial and public infrastructure and consequently part of our daily lives. However, the applicability of GPS in supporting a range of location-sensitive applications such as location based services in an urban environment is severely curtailed by the interference of the 3D urban settings. To characterize and gain in-depth understanding of such interferences and to be able to provide location-based optimization alternatives, a high-fidelity 3D urban model of Melbourne CBD built with ArcGIS and large scale high-resolution spatial data sets is used in this study to support a comprehensive simulation of current and future GNSS signal performance, in terms of signal continuity, availability, strength, geometry, positioning accuracy and reliability based on a number of scenarios. The design, structure and major components of the simulator are outlined. Useful time-stamped spatial patterns of the signal performance over the experimental urban area have been revealed which are valuable for supporting location based services applications, such as emergency responses, the optimization of wireless communication infrastructures and vehicle navigation services.

• 대한치매학회지
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• 제23권1호
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• pp.11-21
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• 2024

Background and Purpose: Although dementia with Lewy bodies (DLB) is the second most common cause of neurodegenerative dementia, its clinical prevalence is low. We developed a short and easy-to-complete DLB screening questionnaire (DLBSQ) to raise diagnostic sensitivity in routine clinical settings. Methods: A total of 501 participants were retrospectively enrolled, including 71 controls, 184 patients without DLB, and 246 patients with probable DLB. All patients underwent clinical evaluation, including core features of DLB, the DLBSQ, brain magnetic resonance imaging, and detailed neuropsychological assessments. The diagnostic performance of the DLBSQ for probable DLB was investigated using a receiver operating characteristic curve analysis. Results: Total DLBSQ score was associated with visuospatial and frontal/executive dysfunction and the diagnosis of probable DLB. The area under the receiver operating characteristic curve for total DLBSQ score was 0.727. Youden's method revealed an optimal cutoff value of 3. The sensitivity and specificity of the DLBSQ were 68.7% and 62.4%, respectively. Its discriminating performance improved when cognitive test profiles were additionally considered (area under the curve: 0.822, sensitivity: 80.6%, and specificity: 70.4%). Conclusions: The DLBSQ might be a useful screening tool for DLB in routine clinical practice with good sensitivity and specificity.

• Corrosion Science and Technology
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• 제23권4호
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• pp.324-333
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• 2024

Atmospheric corrosion poses a significant threat to durability of metallic materials and safety of structures, making precise prediction of corrosion rates crucial in industrial and engineering settings. Understanding the exact rate of corrosion is essential. However, accurate inclusion of various environmental factors that can influence atmospheric corrosion in the calculation of corrosion rate is a complex challenge. This study introduces a physics-based model that incorporates electrochemical methods and considers active surface area affected by surface contaminants to estimate atmospheric corrosion rate of carbon steel. The model can evaluate corrosion levels using key factors such as chloride deposition rate, relative humidity, and the presence of surface particles. By integrating these considerations, this model moves beyond empirical estimations, providing a more stable prediction of corrosion rate that is less susceptible to environmental variations. This model provides a robust tool for defense applications, offering precise insights into the dynamics of atmospheric corrosion that could enhance the maintenance and safety of weapon systems.

• 한국식품조리과학회지
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• 제15권2호
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• pp.146-157
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• 1999

본 연구는 뉴욕 뉴저지 주에 살고 있는 재미한인 주부들을 대상으로 하여 우리 나라 의례음식과 상차림에 대한 의식과 실행을 알아보아 미국생활에서의 한국전통음식문화를 얼마만큼 보전 계승하고 있는지 조사하였다. 1. 의례음식과 상차림의 중요성은 응답자의 57.9%가 중요하다고 생각했고, 의례음식과 상차림을 알게 된 경위는 49.8% 친정어머니, 24.7%가 시어머니한테 배웠다고 응답하였다. 2. 의례음식과 명절차례상차림에 대한 견해는 응답자의 78%가 간소화되어야 한다고 생각했으며 의례음식이 계승발전하기 위하여 중점을 두어야 할 교육은 50.6% 가정교육, 27.3% 대중홍보교육으로 가정교육을 가장 강조하였다 3. 재미 한인 주부들이 가장 잘 알고 있는 상차림은 생일상차림(66.8%), 돌상차림 (43.5%), 백일상차림 (42.4%), 설날과 추석의 차례상차림(52.8%)으로 나타났고, 장국상 차림(21.0%), 주안상차림(23.6%), 혼례시 폐백상차림 (21.4%), 제사상차림(29.2%)으로 나타났으며, 반상차림, 죽상차림, 교자상차림, 회갑상차림은 잘 아는 정도가 17% 미만이었다. 4. 자녀의 돌상차림에 관한 견해는 응답자의 60%가 평소보다 음식을 더 준비하여 가족과 함께 축하해 주었고, 38%는 전통적인 돌잡이 상을 차려 축하하였다. 자녀의 생일상차림은 응답자의 40%는 친구를 집으로 초대하여 생일 잔치해 주고, 37%는 간단하게 집에서 미역국 끓여먹고 선물해 준다고 하였다. 5. 어른들의 생신상차림은 49%가 친척 친지를 초대하여 식사를 대접하여 축하해 드리고, 38%는 집에서 가족끼리 축하해 드린다고 응답했으며, 부모님의 회갑상차림은 41.3%가 친척 친지와 연회장에서 축하해 드리고, 26.6%가 전통적인 큰상차림으로 친척 친지와 함께 가정에서 축하해 드린다하였다. 6. 결혼식의 폐백음식은 50.9%가 폐백을 준비해주는 집에 맡긴다고 하였고, 30.3%는 일부는 집에서 만들고 일부는 맡긴다고 했으며, 14%만이 전통적인 폐백음식을 집에서 준비한다고 하였다. 결혼식 때의 손님접대 음식 준비에 관한 견해는 66.4%는 연회장에서 대접한다, 29.9%는 집에서 음식을 준비하고 연회장에서 대접한다고 조사된 것으로 보아 결혼음식 준비방식이 상업화되고 있음을 알 수 있었다. 7 제사상차림에 관한 견해는 40.2%가 전통적인 상차림으로 제사를 지내고 32.5%가 교회 식으로 지내며, 설날과 추석의 차례상차림에 관한 견해는 41.7%는 전통적인 상차림을 하고 31.7%는 조상 님들이 평소에 좋아하시던 음식을 간단하게 마련하여 지낸다고 했으며, 24.7%는 교회 식으로 지낸다고 응답한 것으로 보아 이들 음식은 집에서 전통적으로 차리는 주부가 많았음을 알 수 있었다. 재미한인 주부들의 우리 나라 의례음식과 상차림에 대한 중요성에 대한 인식은 비교적 높은 편이나 알고 있으며 행하는 정도는 몇몇 상차림을 제외하고는 많은 상차림에 대하여 낮았음을 볼 수 있었다. 집안의 여러 가지 풍속과 생활습관, 음식솜씨들을 친정어머니와 시어머니를 통하여 물려받는다는 것을 알 수 있었는데 이러한 맥락에서 다양한 문화와 함께 살고 있는 재미 2세들의 한국 전통음식문화의 계승은 어려움이 많으리라 사료된다. 주부 자신들의 전통음식에 대한 진정한 이해와 함께 우리음식의 뿌리를 내리고 외국음식과 조화를 이루어 나가도록 하는 적극적인 노력이 필요할 것이다. 그러므로 또한 재미한인 사회에서의 한국전통음식에 대한 홍보, 교육 강화와 함께 재미교포들 모두 관심과 실행이 촉구되어져야 하겠다.

• 한국문헌정보학회지
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• 제51권3호
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• pp.189-213
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• 2017

본 연구의 목적은 정보이용환경 모형을 적용하여 교육열 높은 지역 고등학생들의 특성과 전형적인 정보문제들을 확인하고 그 문제해결을 위한 정보원, 그리고 이용환경을 분석하는 것이다. 이를 위해 서울 K구 소재 중산층과 사교육기관이 밀집한 지역 3개 고교 220명의 학생들에게 설문지를 배포하고 188부의 유효응답 설문지를 회수하였고, SPSS24를 이용하여 기술통계, 상관분석, T-검증, 카이제곱 교차분석, 탐색적 요인분석을 하였다. 수집된 데이터를 사람들, 정보문제, 문제해결, 이용환경의 네 요소로 나누어 분석한 결과, 이 지역 고등학생들은 학교교육, 대학진학, 변화와 혁신에 대체로 긍정적인 태도를 갖추고 있으며 여러 정보원 중에 인터넷커뮤니티와 포털을 가장 선호하였다. 학생들의 전형적인 정보문제는 7개 자아범주의 21개 문제임이 도출되었으며 이들은 감정적 자아와 인지적 자아 범주의 문제들을 가장 중요하다고 인식하였다. 이 두 자아범주의 문제해결을 위해서는 부모, 형제, 자매가 주요정보원이었는데 이 결과는 학생들이 가장 선호하는 정보원이 인터넷 커뮤니티와 포털이라는 조사 결과와는 달라 흥미롭다. 학생들의 주중 일상적 이용환경은 집과 학교이며 그 외 스마트기기, 사교육학원, PC 또는 노트북 등의 순이었고 학생들의 주말 일상적 이용 환경은 집 외에 사교육학원, 음식점, PC 또는 노트북 등의 순이었다. 또한 이용환경은 성별과 학년에 따라 유의미한 차이를 나타냈다. 본 연구는 후속 연구를 위해 연구 결과로부터 파생된 여러 연구 질문을 남겼으며 다양한 맥락에 적용가능한 정보이용환경 모형을 교육열이 높은 지역 고등학생들에게 적용했다는 점에서 의의가 있다.

• 대한간호학회지
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• 제26권2호
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• pp.483-496
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• 1996

The purpose of this study was to describe how Korean nurses overcome the language barrier while working in the U.S. hospital settings. Twelve Korean nurses living in New York metropolitan area were asked open-ended, descriptive questions to collect the data. The interviews were done in Korean. All interviews were audiotaped under the permission of the participants and were transcribed verbatim. The data were analyzed using grounded theory analysis. The research process consisted of two phases. In the first phase 8 Korean nurses were interviewed and analyzed. In the second phase, further data were collected to verify categories and working hypotheses that were emerged from the first phase. The results of this study show that all Korean nurses experienced severe psychological stress such as confusion, anxiety, frustration, loss of self-confidence, embarrassment, guilt, depression, anger, and fear. Among the mode of communication such as listening, speaking, leading, and writing, they had the most difficulty in speaking. Speaking ability was especially important for them because of the emphasis of individualism and self-defense in the U.S. Among the verbal communication modes, non-face-to-face communications such as phone conversation and body language were the most difficu1t for them to overcome. It took at least 2 years for the participants to initially overcome the language barrier in U.S. hospitals. After 2-5 years they began to feel comfortable even in non-face-to-face communication. They could actively search for the better place to work after 5 years. They finally felt comfortable in English and in their job almost after 10 years. The factors that influenced the English improvement were ‘the years of clinical experience in Korea’, ‘the decade they came to the U.S.’ ‘coming to U.S. alone or with other Korean nurses’, ‘racial homogeneity or heterogeneity of the working unit’, and ‘the degree of social support’. The strategies Korean nurses used to overcome the language barrier included depending on the written communication, using ‘nunchi’, working and studying hard, and establishing good interpersonal relationships with co-workers. They also employed assertive behavior of the U.S., such as using more explicit verbal language and employing smiles and eye contact with others during the conversation. The results of the study may help Korean nurses and nursing students who try to work in U.S. hospital settings by understanding problems other Korean nurses faced, factors that influenced their English improvement, and strategies they used. They may also help U.S. nurses and administrators in developing and implementing efficient programs for newly employed Korean nurses by understanding major problems and feelings the Korean nurses experienced and strategies they used to overcome the language barriers.