• Steel and Composite Structures
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• 제32권3호
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• pp.347-359
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• 2019

Modular construction has been increasingly used for mid-to-high rise buildings attributable to the high construction speed, improved quality and low environmental pollution. The individual and repetitive room-sized module unit is usually fully finished in the factory and installed on-site to constitute an integrated construction. However, there is a lack of design guidance on modular structures. This paper mainly focuses on the evaluation of the initial stiffness of corrugated steel plate shears walls (CSPSWs) in container-like modular construction. A finite element model was firstly developed and verified against the existing cyclic tests. The theoretical formulas predicting the initial stiffness of CSPSWs were then derived. The accuracy of the theoretical formulas was verified by the related numerical and test results. Furthermore, parametric analysis was conducted and the influence of the geometrical parameters on the initial stiffness of CSPSWs was discussed and evaluated in detail. The present study provides practical design formulas and recommendations for CSPSWs in modular construction, which are useful to broaden the application of modular construction in high-rise buildings and seismic area.

• 한국식품영양학회지
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• 제30권6호
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• pp.1245-1251
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• 2017

The objective of this study is to investigate the satisfaction of elementary, middle and high school nutrition teachers in the Chungnam province concerning the free school food service. We surveyed satisfaction related to policies on school food service and the school food service center. Satisfaction on the school food service center was separated according to four dimensions; perception, food materials, operational system and service. Furthermore, we analyzed factors that affect satisfaction with the school food service center with a multiple regression model. First, satisfaction about the free school food service and dietary life education are higher than the total average of satisfaction with the policy about the school food service. Second, satisfaction about a variety of food materials and reasonable prices are lower than total average of satisfaction with the school food service center. Third, when more teachers have a high level of a positive perception and have higher satisfaction with the operational system of the school food service center, then they also subsequently display higher satisfaction with the school food service center. Therefore it is necessary to improve or make up for pricing and diversity on food materials by the school food service center.

• 대한지역사회영양학회지
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• 제20권3호
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• pp.165-177
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• 2015

Objectives: Based on individual and environmental characteristics of low-income children, we developed a nutrition education program for school-aged children from low-income families according to effective use in social welfare centers. Methods: We conducted in-depth group interviews to assess program needs in 28 participants, 10 low-income school-aged children and 9 of their care givers, 9 social workers and 9 care-givers. Theoretical backgrounds of our program were heath belief model and social cognitive theory considering motivation, action and environment characteristics. Results: Based on the findings of this qualitative study, we developed major program themes and contents. Five selected key themes were 'balanced diet', 'processed food', 'food hygiene and safety', 'Korean healthy traditional diet', and 'family cooking' to induce changes in dietary behaviors. Main findings of in-depth group interviews included 'child's active participation', 'simple and easy to understand messages', and 'environmental constraints' such as a lack of child care at home, limited budget of social welfare centers, and less qualified educators for nutrition and health. Each lesson was constructed as a 1-hour program particularly emphasizing activity-based programs, including cooking and teamwork exercises. Program contents in each session consisted of activities that could induce outcome and value expectations, self-efficacy, perceived benefits, and barriers and cues to actions regarding diet behavior. Conclusions: We developed a nutrition education programthat is rarely available for low-income children in Korea, considering theoretical bases. Further studies are needed to validate our program.

• 한국가정과교육학회지
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• 제15권4호
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• pp.115-132
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• 2003

본 연구는 제 7차 실과교육과정의 6학년 재활용품 만들기 단원에 창의적 문제해결 수업모형을 적용하여 환경의식 및 창의성을 증진시킬 수 있는가를 실험적으로 검증함으로서 초등 실과 환경 단원의 교수-학습 방법에 관한 기초 자료를 제공하는데 연구의 목적을 두었다. 본 연구는 초등실과환경 단원에 적용한 창의적 문제해결 수업 안의 효과를 알아보기 위하여 실험집단에는 창의적 문제해결 수업안을 적용한 교수-학습 계획안을, 비교집단에는 전통적 수업모형을 적용한 교수-학습 계획안을 적용하였다. 본 연구에서는 창의적 문제해결 수업안을 적용한 실험집단과 전통적 수업모형을 적용한 비교집단간의 환경의식의 차이를 검증하기 위하여 t-검증을 실시하였다. 연구 결과 다음과 같은 결론을 내릴 수 있었다. 첫째, 초등실과 환경단원의 창의적 문제해결 수업모형을 적용한 실과수업을 받은 아동은 환경의식 점수가 의의 있게 향상되어, 창의적 문제해결 수업이 아동의 환경의식 증진에 효과가 있음을 알 수 있다. 이는 환경단원의 창의적 문제 해결 수업이 실천적이고 일상 생활에서 일어나는 생활 습관에 관련된 교육 내용이 많이 포함되어 있어 환경 보존 실행의지가 강화되고, 스스로 찾은 여러 가지 환경 문제를 파악하고 해결하기 위해 다양한 학습을 전개하고 환경관련 주제에 대해 다양한 기능이 배양된 것으로 학생들의 환경의식과 실천태도가 향상되었음을 알 수 있다. 또한 환경문제를 해결하기 위한 재활용 만들기가 우리 생활에 긍정적인 영향을 미치는 것을 눈으로 확인함으로서 환경에 대한 인식이 긍정적으로 형성된 것으로 본다. 둘째, 실과교과에의 창의적 문제해결 수업의 적용은 아동의 창의성 검사결과 유의한 결과가 나타나 창의적 문제해결 수업이 아동의 창의성 향상에 효과가 있음을 알 수 있다. 이는 주변의 환경에 대해 민감한 관심을 보이고 이를 통해 새로운 탐색 영역을 넓히려는 민감성이 생겨났고, 의식적, 무의식적 강박 관념을 없애고 일단 떠오르는 모든 생각들을 수용하고 활용함으로써 특정한 문제 상황에서 가능한 한 많은 양의 아이디어를 산출할 수 있는 능력이 커졌으며, 자신에게 익숙한 관점에만 고착되어 문제를 해결하거나 결론을 내리는 경향에서 벗어나 고정적인 사고의 틀을 깨고 발상 자체를 전환시켜 유연하고 융통성 있게 생각이 변환되어 자기만의 독특한 아이디어를 산출할 수 있는 능력이 형성된 것으로 본다. 이상의 연구 결과를 볼 때, 초등실과환경 단원의 창의적 문제 해결 수업 모형의 적용은 아동의 환경의식과 창의성을 신장시킨다고 할 수 있다.

• Advances in concrete construction
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• 제10권1호
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• pp.81-92
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• 2020

Flexural and splitting strength behavior of conventional concrete can significantly be improved by incorporating the fibers in it. A significant number of research studies have been conducted on various types of fibers and their influence on the tensile capacity of concrete. However, as an important property, tensile capacity of fiber reinforced concrete (FRC) is not modelled properly. Therefore, this paper intends to formulate a model based on experiments that show the relationship between the fiber properties such as the aspect ratio (length/diameter), fiber content, compressive strength, flexural strength and splitting strength of FRC. For the purpose of modeling, various FRC mixes only with steel fiber are adopted from the existing research papers. Automated neural network search (ANS) is then developed and used to investigate the effect of input parameters such as fiber content, aspect ratio and compressive strength to the output parameters of flexural and splitting strength of FRC. It is found that the ANS model can be used to predict the flexural and splitting strength of FRC in a sensible precision.

• Environmental Engineering Research
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• 제25권3호
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• pp.281-289
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• 2020

Environmental fate of ionizable organic pollutants such as perfluoroalkyl acids (PFAAs) are of increasing interest but has not been well understood because of uncertain values for parameters related with atmospheric interphase partitioning behavior. In the present study, not only the values for air-water partition coefficient (K_AW) and dissociation constant (pKa) of PFAAs were induced by adjusting to in situ measurements of air-water distribution coefficient between vapor phase and rainwater but also gas-particle partition coefficients were also estimated using three-phase partitioning model of ionizable organic pollutants, in situ measurements of PFAAs in aerosol and air vapor phase, and obtained parameter values. The pKa values of PFAAs we obtained were close to the minimum values suggested in literature except for perfluorooctane sulfonic acids, and COSMOtherm-modeled K_AW values were assessed to more appropriate among suggested values. When applying parameter values we obtained, it was predicted that air particle-associated fate and transport of PFAAs could be negligible and PFAAs could distribute ubiquitously along the transection from urban to rural region by pH-dependent phase transfer in air. Our study is expected to have some implications in prediction of the environmental redistribution of other ionizable organic compounds.

• 한국산업보건학회지
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• 제28권1호
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• pp.117-123
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• 2018

Objectives: The aim of this study was to examine factors influencing health-related quality of life in women workers using the dataset of the Korean National Health and Nutritional Examination Survey(KNHANES 2th). There were 955 subjects. Methods: A multiple regression model was used to study the factors influencing health-related quality of life of women workers. Results: A positive relationship was found between education(b=0.014, p=0.029) and health-related quality of life in women workers and non-osteoarthritis(b=0.037, p<0.001) and health-related quality of life in women workers. Conclusions: The results of this study show the importance of improving the working environment and preventing osteoarthritis in non-regular employment.

• 보건교육건강증진학회지
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• 제31권5호
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• pp.159-166
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• 2014

Purpose: In spite of many Healthy Cities projects in Korea, there are few research about healthy urban planning. So we tried to use available recent models to a Healthy Cities project in a medium sized city in Gyeongnam province. Methods: Using mainly European Healthy Urban Planning Model and opinion leader survey, SWOT analysis, forum and discussion have been done to a city. Secondary city health indicator obtained from Ministry of Statistics. Results: There are strong need to develop health industry, green traffic and healthy living from survey using Healthy Cities policy direction of Korean Health Promotion Fund. Among the Healthy Urban Planning objectives, improvements of physical environments, prevention of accidents and crime, improvements of healthy esthetics rated highly. Although environmental pollution was problem local government push forward to the pilot healthy urban project as active healthy water-front development. Considering secondary healthy city indicators, change of external forces and internal capacity final task for healthy urban planning for Yangsan city were development of riverside physical education park and active living and anti-ageing environments etc. Conclusions: Comprehensive assessment and plan was possible through MAPP Model using European Healthy Urban Planning objectives to draw the direction of future urban planning for Healthy Cities Projects. Further research and formal introduction would be needed.

• 로봇학회논문지
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• 제18권1호
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• pp.122-126
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• 2023

An unexpected occlusion in a real life, not in a laboratory, can be more fatal to neural networks than expected. In addition, it is virtually impossible to create a network that learns all the environmental changes as well as occlusions. Therefore, we propose an alternative approach in which the architecture and number of parameters remain unchanged while adapting to occlusion circumstances. Learning method with the term Conversion Learning classifies them more robustly by converting the weights from various occlusion situations. The experiments on MNIST dataset showed a 3.07 [%p] performance improvement over the baseline CNN model in a situation where most objects are occluded and unknowing what occlusion will appear in advance. The experimental results suggest that Conversion Learning is an efficient method to respond to environmental changes such as occluded images.

• 한국과학교육학회지
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• 제26권4호
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• pp.546-558
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• 2006

본 연구의 목적은 지구환경적 문제를 해결하는 과정 중에 귀추법이 어떻게 활용되는가를 발견법적으로 확인하기 위한 것이었다. 현직 지구과학 교사, 사범대학의 예비 과학 교사, 그리고 고등학교 학생 등 서로 다른 배경을 지닌 참여자들이 총 32개 조를 이루어 끝이 열린 형태의 지구환경적 문제를 해결하였고, 그 과정에서 자신들의 추론 과정이 기록된 텍스트를 산출하였다. 이 텍스트에 포함된 추론 과정을 귀추법의 삼단논법적 형식에 따라 정리하고 귀추적 추론에서 사용된 사고 전략들을 반복적으로 분석하였다. 그 결과, 추론자들이 지구환경적 문제 해결 상황에서 귀추법을 사용하였으며, 그들은 다양한 사고 전략들을 활용하여 귀추적 결론을 낳게 하는 규칙을 추리해 내었음을 알 수 있었다. 이 전략들은 자료의 재구성, 연쇄적 귀추, 특이 정보의 채택, 모델 구성 및 조작, 인과적 결합, 제거, 사례 기반의 유추, 그리고 존재에 관한 전략 등이었다. 결론적으로, 학생들의 사고 능력을 증진시키고 지구과학과 지구환경적 문제 해결 과정의 특징에 대한 학생들의 이해를 함양하기 위하여 귀추적 추론 과제가 이용될 수 있다는 것을 시사 받을 수 있었다.