• Nuclear Engineering and Technology
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• 제49권4호
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• pp.760-768
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• 2017

The transition temperature shift (TTS) of the reactor pressure vessel materials is an important factor that determines the lifetime of a nuclear power plant. The prediction of the TTS at the end of a plant's lifespan is calculated based on the equation of Regulatory Guide 1.99 revision 2 (RG1.99/2) from the US. The fluence factor in the equation was expressed as a power function, and the exponent value was determined by the early surveillance data in the US. Recently, an advanced approach to estimate the TTS was proposed in various countries for nuclear power plants, and Korea is considering the development of a new TTS model. In this study, the TTS trend of the Korean surveillance test results was analyzed using a nonlinear regression model and a mixed-effect model based on the power function. The nonlinear regression model yielded a similar exponent as the power function in the fluence compared with RG1.99/2. The mixed-effect model had a higher value of the exponent and showed superior goodness of fit compared with the nonlinear regression model. Compared with RG1.99/2 and RG1.99/3, the mixed-effect model provided a more accurate prediction of the TTS.

• 응용통계연구
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• 제28권2호
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• pp.289-294
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• 2015

생동성 시험과 같은 임상약리학분야의 연구는 일반적으로 한 개체 내에서 반복하여 측정된 자료구조를 사용하므로 선형혼합모형을 이용하여 분석하는 것이 보편적이다. 이러한 모형에서 랜덤효과는 개체 내 관측 자료 사이의 상관관계를 설명하고, 공분산행렬은 개체-내 변동을 설명한다. 생동성 분석은 두 약물의 약동학적 변수인 Cmax와 AUC의 기하평균비에 대한 90% 신뢰구간이 동등성 한계인 [0.8, 1.25] 범위에 드는지 알아보는 분석으로, 고정효과에는 시기, 순서군, 치료효과를, 랜덤효과에는 개체효과를 가지는 선형혼합모형을 이용하여 분석한다. 이러한 분석이 적용된 실제 예를 살펴보기 위하여 레보플록사신 연구의 자료를 활용하였다.

• 한국융합학회논문지
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• 제12권12호
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• pp.479-490
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• 2021

본 연구는 코로나-19 상황에서 간호대학생의 임상실습을 대체하는 혼합실습 경험의 본질을 파악하기 위해 시도되었다. 2020년 12월 17일부터 2020년 12월 31일까지 간호대학생 8명을 대상으로 심층 인터뷰를 개별적으로 시행하여 자료 수집을 하였고 Colaizzi의 현상학적 분석 방법론을 적용하여 자료를 분석하였다. 간호대학생의 혼합실습 경험을 통해 '불안 속 수용하기', '전면에 드러난 자율성', '마음을 졸인 비대면 실습', '지식 채워나가기', '목표달성이 가능한 다양한 접근', '아쉬움이 남은 최선의 실습'의 6가지 범주가 나타났다. 감염병 대유행 상황에서 간호대학생은 혼합실습에 대한 불안과 우려를 가지고 임상실습 대체를 받아들였으며, 자기주도적인 학습을 통해 실습 적응 방법을 모색하고 임상실습의 목표를 달성하는 경험을 하였다.

• 한국재난정보학회 논문집
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• 제4권1호
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• pp.86-100
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• 2008

It is needed to classify the kinds of construction and demolition(c&d) debris to 6 catagories of waste concrete, waste asphalt concrete, waste wood, scraps, combustible waste and incombustible waste in order to properly do a separate discharge and to estimate unit generation rate in construction site. Also, in this case, the unit treating cost for mixed wastes should be applied with the unit treating cost for combustible waste. The construction standard materials estimation data is used for basic data for estimating unit generation rate. The mixed wastes in this data should be classified to waste wood, combustible waste and incombustible waste, and their ratio is obtained by using the unit generation rate of Asia Pacific Environment and Management Institute and Seoul Metropolitan Development Institute. The waste amounts generated from newly-built construction can be obtained from multiplying the loss rate by the amount of materials used from construction standard estimation data. Also, those from dismantling construction can be obtained by subtracting waste amount generated during newly-built construction from total input amount of materials in newly-built construction. Those in two cases can be used in construction site. It can be used for estimating the amount generated and establishing the treating plan in the case of setting up the policy of waste management and doing the environment impact assessment.

• 지역사회간호학회지
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• 제30권4호
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• pp.414-425
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• 2019

Purpose: The purpose of this study was to examine the effects of psychosocial wellbeing status and self efficacy on health-promoting behavior of nursing students, and to explore the experiences related to health-promoting behavior. Methods: For this study, an explanatory sequential mixed method design approach was used with survey data collected from 148 nursing students. In addition, qualitative data for exploration of health-promoting behavior experience were collected from three focus-group interviews of 17 participants. Quantitative data were analyzed with SPSS/WIN 25.0 and qualitative data were analyzed by making contents analysis with Nvivo 12.0. Results: The results showed that psychosocial wellbeing status, self efficacy, grade, and regularity meal explained 43.0% of the variance in health-promoting behavior. And seven themes from the collected significant statements about experience of health-promoting behavior included the daily life going on without delay; changes in body which is felt; recognizing the necessity of health care; making efforts to increase physical activities; revising eating habit; looking for the way to relieve stress; and attempting to divert my thoughts. Conclusion: Based on the results of this study, it is necessary to develop and verify health program in order to improve nursing students' health-promoting behavior. And university authorities and government should make an effort to improve nursing students' health-promoting behavior.

• 대한건축학회논문집:구조계
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• 제34권5호
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• pp.13-18
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• 2018

In this research, regarding the type three blast furnace slag (BS) regulated by KS F 2563 and supplied to actual ready mixed concrete plant, the fineness on specification and actually measured fineness by Blain test were compared, and by applying the hydrometer method used for early prediction of concrete strength, the feasibility of the hydrometer method for acquisition inspection of BS was analyzed. Additionally, the influence of various fineness of BS on properties of cement mortar was also assessed. According to the experimental results of this research, correlation of fineness values between specification and actually measured data were not matched. In the case of the rapid evaluation method using hydrometer, a good relation was shown between the fineness data obtained from hydrometer and Blain test. furthermore, from the cement mortar properties test, there was a good relation was obtained between fineness data from rapid evaluation method by hydrometer and cement mortar properties, while there was no clear relation between fineness data from specification and cement mortar properties. Hence, as a qulity controlling method of BS fineness, a rapid evaluation method using hydrometer is suggested as a new method.

• Child Health Nursing Research
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• 제30권1호
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• pp.31-44
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• 2024

Purpose: This study aimed to identify the infant-rearing experiences of parents during the coronavirus disease 2019 (COVID-19) pandemic and provide foundational data for the development of infant-rearing support programs during pandemic situations. Methods: Convergent mixed methods were used to better understand the research outcomes by converging both quantitative and qualitative data. A total of 149 parents with infant-rearing experiences during the pandemic responded to a self-report survey, and 10 parents participated in the interviews. Data were analyzed using Colaizzi's method, descriptive statistics, t-test, one-way analysis of variance, the Scheffé test, Pearson correlation coefficients, and hierarchical regression. Results: Analysis of qualitative data yielded the following three categories: five theme clusters, ten themes, and thirty-nine subthemes. The factors influencing infant-rearing behavior were nuclear family (β=.34, p<.001) and rearing stress (β=-.39, p<.001). The explanatory power of the regression equation was 26.6%. Conclusion: Infectious disease disasters, such as the COVID-19 pandemic, can quickly alter infant-rearing conditions, causing heightened parental anxiety. This may affect infant-rearing behaviors and hinder healthy infant development. Future research should develop a comprehensive tool to measure holistic health-related parenting behaviors across the different stages of child development. Additionally, pediatric nurse practitioners can play an active role in educating parents, supporting parenting, and promoting healthy infant development in their communities, making pediatric nurse practitioners a highly relevant and necessary healthcare profession during infectious disease disasters. Thus, there is a need to improve institutions and build infrastructure at the national level to support them.

• 대한약침학회지
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• 제27권2호
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• pp.142-153
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• 2024

Objectives: This study aimed to analyze the educational needs of interns and residents in Korean medicine as the first step in developing an education program to improve their research competencies. Methods: A mixed-method design, incorporating both quantitative and qualitative data collection methods, was used to investigate the educational needs for research competencies among interns and residents working in Korean medicine hospitals nationwide. Data were collected through online surveys and online focus group discussions (FGDs), and processed using descriptive statistical analysis and thematic analysis. The study results were derived by integrating survey data and FGD outcomes. Results: In total, 209 interns and residents participated in the survey, and 11 individuals participated in two rounds of FGDs. The majority of participants felt a lack of systematic education in research and academic writing in postgraduate medical education and highlighted the need for nationally accessible education due to significant disparities in the educational environment across hospitals and specialties. The primary barrier to learning research and academic writing identified by learners was the lack of knowledge, leading to time constraints. Improving learners' research competencies, relationship building, autonomy, and motivation through a support system was deemed crucial. The study also identified diverse learner types and preferred educational topics, indicating a demand for learner-centered education and coaching. Conclusion: This study provides foundational data for designing and developing a program on education on research competencies for interns and residents in Korean medicine and suggests the need for initiatives to strengthen these competencies.

• 한국산학기술학회논문지
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• 제17권12호
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• pp.253-261
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• 2016

본 연구는 혼합연령학급의 현황과 학급 운영 실태를 파악하여, 혼합연령학급의 교사가 효과적으로 학급을 운영할 수 있도록 정책적 지원 방안을 모색하는데 목적이 있다. 이를 위해 먼저 전국 유치원의 혼합연령학급 운영현황 및 학급편성 기준을 분석하여 그 현황을 살펴보고, 다음으로 혼합연령학급 교사를 대상으로 설문조사를 통해 구체적인 어려움과 요구사항을 분석하였다. 설문조사는 유치원의 교육과정시간에 혼합연령학급을 운영하고 있는 담임교사 300명을 대상으로 웹조사로 실시하였으며, 빈도, 백분율, 교차분석을 실시하였다. 그 결과는 다음과 같다. 첫째 유치원의 혼합연령학급 편성이유는 취원 대상 유아의 수가 부족하다는 것이 가장 큰 이유였다. 둘째, 혼합연령학급 운영에서 지원인력의 부족, 교육(연수)제공 및 활용 기회 부족 등이 어려운 점으로 나타났다. 셋째, 혼합연령학급 운영에서 가장 필요한 운영지원으로는 수업인력 지원, 행정인력 지원 순으로 나타났다. 현재 이루어지고 있는 혼합연령학급 인력지원은 수업도우미, 행정도우미 순이었고, 유치원과 관련이 있는 유관 기관으로 지원 유무는 약 23.0%로 나타났고, 지원의 종류로는 교사연수, 인력예산, 컨설팅장학, 교재교구 등 수업자료 지원 순으로 나타났다. 이를 바탕으로 혼합연령학급 편성 시, 연령별 비율구성제시, 단계적 단일연령학급 편성유도, 혼합연령학급 교사 연수 기회제공 확대 등의 정책 지원방안을 제시하였다.

• 국제초고층학회논문집
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• 제9권2호
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• pp.197-212
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• 2020

In this study, POE(Post Occupancy Evaluation) evaluation indexes were selected into six categories through the consideration of theories and prior research. Therefore, qualitative supply can be achieved through POE according to the aspect of residential environment after the quantitative supply of mixed-use apartment complex by the population concentration in Seoul due to industrialization and urbanization. As the evaluation elements, detailed survey contents were selected for livability, convenience, comfort, safety, economy, and sociality. Based on the survey contents, six elements were evaluated and analyzed using Data coding and Likert scale after surveying 12 complexes (Urban areas and non-urban areas) in Seoul. As a result of the study, six categories selected as the POE showed that importance of quality of life and safety was developed in high recognition according to high satisfaction with convenience and safety. Sociality showed the lowest satisfaction in the following order : livability, comfort, economy and sociality. Residents' sense of community, interaction with neighborhood, etc., showed low satisfaction, and it seems that it is necessary to improve and supplement the system for the development of mixed-use apartment complex in the future. The detailed characteristics of livability showed high satisfaction of the living room, the front door and the main room which are main uses of housing, and low satisfaction in storage size. The analysis of convenience is that convenient public transportation was the highest, and educational environment and additional facilities were the lowest, showing the advantages and disadvantages of location characteristics. As a result of the analysis of comfort, satisfaction with the landscape area was low and it seems that green space is needed for the development of mixed-use apartment complex in the future. Lastly, regarding the safety, the satisfaction of the access control, the location of security office, etc. were high, however separation of circulation was low. Therefore, it is necessary to clearly separate the circulation between the residence and other facilities in the mixed-use apartment complex.