• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1999년도 제29회 춘계학술대회
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• pp.53-60
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• 1999

As the flying height decreased, it is essential that hard disk drives perform reliable under various environmental conditions. In this paper the tribological characteristics of a head/disk interface are investigated under various temperature, relative humidity, altitude and outgas conditions. Specially, Contact-Start-Stop(CSS) tests were performed to assess the stiction, acoustic emission, slider take-off behavior, and track average amplitude(TAA). It is shown that the surface damage and head failure are accelerated by high temperature and humidity as well as low ambient pressure.

• Wind and Structures
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• 제18권2호
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• pp.117-134
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• 2014

It is believed that offshore wind farms may satisfy an increasing portion of the energy demand in the next years. This paper presents a comparative study of the fatigue performances of tripod and jacket steel support structures for offshore wind turbines in waters of intermediate depth (20-50 m). A reference site at a water depth of 45 m in the North Atlantic Ocean is considered. The tripod and jacket support structures are conceived according to typical current design. The fatigue behavior is assessed in the time domain under combined stochastic wind and wave loading and the results are compared in terms of a lifetime damage equivalent load.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.423-426
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• 2005

Steel reinforced concrete (SRC) columns, which are widely employed in high-rise buildings, exhibit particular time-dependent behavior due to creep and shrinkage of the concrete, and this behavior may cause problems related to serviceability and structural stability. SRC columns also exhibit a time-dependent, cross-sectional relative humidity distribution that differs from reinforced concrete (RC) columns, due to the presence of an inner steel plate, which interferes with the moisture diffusion of concrete. This differential moisture distribution of SRC columns may reduce the drying shrinkage and the drying creep as contrasted with RC columns. Therefore, we propose that the differential moisture distribution be taken into account to accurately predict SRC column shortening.

• Nuclear Engineering and Technology
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• 제50권5호
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• pp.758-766
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• 2018

We developed numerical models to efficiently simulate the low-cycle fatigue behavior of a pipe elbow. To verify the model, in-plane cyclic bending tests of pipe elbow specimens were conducted, and a through crack occurred in the vicinity of the crown. Numerical models based on the erosion method and tie-break method are developed, and the numerical results are compared with experimental results. The calculated results of both models are in good agreement with experimental results, and the model using the tie-break method possesses two times faster calculation speed. Therefore, the numerical model based on the tie-break method would be beneficial to evaluate the strength of piping systems under seismic loadings.

• 한국초등과학교육학회지:초등과학교육
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• 제33권3호
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• pp.524-535
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• 2014

The purpose of this study was to develop the creative hands-on activities using EM (effective microorganisms) that can enhance the environmental literacy of learners, and to examine the effect of its application. The program was composed of 10 sessions, including biological knowledge and ecosystem status of microorganisms, practical activities that stimulate the environmental behavior and emotion of elementary school students, and career design related to their aptitude and occupation in future. This program can also be connected to the domains of creative hands-on activities, that is, career activities, club activities, self-regulated activities and voluntary service activities. In this study, two classes of 3th grades of elementary school in Seoul were selected and divided into two groups. The experimental group to undergo the program of creative hands-on activities using EM showed higher environmental literacy than the control group. In the concrete, it is proven that this program contributed to the improvement of learners' environmental emotion, skill, and behavior. When interviewed with experimental group, we found that sustained EM hands-on activities were conducted in collaboration with their families, and they became more aware of the utilities of EM and could participate in the activities more interestingly. In conclusion, the creative hands-on activities program was very effective and helped elementary students to change their environmental literacy in positive ways.

• 한국식생활문화학회지
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• 제22권5호
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• pp.582-589
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• 2007

The purpose of this study was to measure the causal relationships among affective belief, environmental belief, subjective norm, attitude and meat consumption behavior. A total of 318 questionnaires were completed. Structural equation model was used to measure the causal relationships among the constructs. Results of the study demonstrated that the structural analysis result for the data also indicated excellent model fit. The effects of affective belief, environmental belief and subjective norm on attitude were statistically significant. The effects of affective belief, environmental belief and subjective norm on meat consumption were statistically significant. As expected, attitude had a significant effects on behavioral intention. Moreover, attitude played a mediating role in the relationship between affective belief and meat consumption, environmental belief and meat consumption, subjective norm and meat consumption. Consumption played a mediating role in the relationship between attitude and behavioral intention. In conclusion, based on structural analysis, a model was proposed of interrelations among affective belief, environmental belief, subjective norm, attitude, meat consumption and intention. It should be noted that the original model was modified and should, preferably, be validated in future research. Other variables may be incorporated to form models that consist of new antecedent and consequence pairs.

• 환경위생공학
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• 제22권4호
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• pp.105-117
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• 2007

The research was conducted based on the 1012 cases questionnaire for the purpose of to evaluate the change effect of university student's consciousness and behavior before and after lecture on environmental problems. And this questionnaires were performed with self-administered by the university student who made a application for liberal arts related to environmental subjects. The results were as follows. According to the analysis results the most students responded that the most serious problem of environmental pollution before the lecture on environmental education was a genetic modified organism(3.64/4.00), but the most serious problem of environmental pollution was changed to the topic of water pollution(3.96/4.00) after the lecture on environmental problem. And also according to the analysis results dributed by gender were that boy students show a higher concerning(170%) than that of girl students(150%). The most good results obtained after lecture on environmental problem were water pollution(23.0%), air pollution(11.5%), waste material pollution(10.9%), food additives (10.0%), genetic modified organism(8.0%), endocrine disrupter(7.5%), respectively. And according to the analysis results distributed by a grade were that the concerning of a low grade(freshman, sophomore)were higher than that of a high grade(junior, senior) in the topic of water pollution, air pollution, waste material pollution. But there were high level of awareness on the topic of food additives, genetic modified organism, endocrine disrupter to the all students(freshman to senior). And according to the analysis results distributed by a major field of study were that students who major in art & athletics, liberal art and etc(public health) were show a deep concerning than that of science & engineering. Finally, the environmental education during the university class were effectively contribute to increase the awareness of the seriousness of environmental pollution problem(8.2%) and also contribute to the practical life after class also increase their consciousness of environmental problem(59.8%).

• 한국환경교육학회지:환경교육
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• 제5권1호
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• pp.34-46
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• 1993

The international environmental activity and environmental education began in 1970's. Environmental education in Korea was emphasized since the Forth National Curriculum. The Environmental Curriculum was regarded as one of the most important part in the Sixth National Curriculum in Korea. Environment-related reference texts of Elementary school were already developed. Soon, 'Environment' of middle school and 'Environmental Science' of high school will be developed. The purpose of this study were to analyse environment-related texts in the Fifth National Curriculum and to measure how much environmental education has achieved. As a environmental text for regular class, selected the environmental part in 'Science Part 1' and as environment-related reference text, 'Survival and Environment'. The environmental part of 'Science Part 1' was unit [Life and Environment]. According to the analysis of objectives, most of unit objectives were not stated in a detailed and precise manner. When the goals of environmental education were divided into four fields as follows, knowledge and information, skill, thinking and attitude, behavior and participation, unit objectives were mostly emphasized on knowledge and information of environment, exactly 44.5% of unit objectives and 89.6% of subunit objectives. The degree of relationship between unit objectives and contents was low. All the Check up-problems were about knowledge and information of environment. Environment-related reference text, 'Survival and Environment' was the only reference text for high school students in Korea and was organized in the form of the regular curriculum text. It was developed in Korean Education Development, Center with support of Korean Environmental Ministry in 1990. According to the analysis of 'Survival and Environment', the objectives of units and subunits were less stressed on knowledge and information than those of unit [Life and Environment] in the environmental part of 'Science Part 1' On the other hand, they were a little more stressed on skill, thinking and attitude, behavior and participation. And fifteen of all the seventy subunit objectives were not related with contents. In organization, this text included Thinking problems, Experiments and Inquiries, Reading, Developed studies and Check up-problem etc. It was remarkable that Inquiries leaded to individual activities and Developed studies to group discussions or individual inquiries. And as Check-up problems were presented as a form of activities, students could achieve many various objectives at the same time by solving one problem. To measure the achievement of environmental education by questionnaire, 497 high school students in total were selected from five different schools. Scores in subtest 'behavior and participation' and subtest 'thinking and attitudes' were 13.19 and 18.18, respectively. Actually, most students had a positive thinkings and attitudes in their hearts about environmental problems, but many of them actually did not take actions to solve environmental problems and to protect environment. Scores in subtest 'knowledge and information' and subtest 'skill' were 10.76 and 10.81, respectively. The higher the score students got in 'knowledge and information', the higher the score in 'skill'. It implies that learning of skills is based on learning of knowledges and informations about environment has not always ensured positive thinkings and attitudes or active behaviors and participations to solve environmental problem.

• 한국철학논집
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• 제28호
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• pp.155-182
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• 2010

환경 윤리에 대한 윤리학적 의견이 분분하기는 하지만 인간과 자연에 관한 관계의 재정립, 인간의 자연에 대한 의식 및 인식의 전환, 도덕적 의무와 책임의 확대 등이 도덕·윤리과에서 담당해야 할 환경 윤리 교육의 공통된 주제로 모아진다. 곧 '환경 교육'은 전 교과에서 시행될 수 있지만, '환경 윤리 교육'은 도덕·윤리과의 정체성적 성격을 갖는다고 할 수 있다. 『도덕』 교과서에서 환경 문제에 관한 단원은 외형적인 틀은 체계를 갖추었다고 할 수 있다. 하지만 모순되는 관점의 병렬적 진술, 문명과 자연의 이분구도, 동양 사상에 대한 비주류적 접근 혹은 개인적 태도에 초점을 맞춘 진술 등이 문제점으로 지적될 수 있을 것이다. 윤리와 사상에서도 생태주의와 인간 중심주의의 대결구도, 인간을 환경 혹은 생태계의 암적인 존재로 몰아가고 있는 것이 문제점으로 지적될 수 있다. 교수-학습 과정에 있어서 윤리 교육은 '지정행(知情行)'의 통합 교육이 되어야 한다. 그런데 환경 문제의 근원적인 원인을 '인식'에 둔다면, 고등학교 환경 윤리 교육의 교수-학습의 중요도는 '인지>정의, 행동'으로 되어야 한다. 고등학생은 환경 윤리학에 대한 고차의 지식과 관점을 비판적으로 검토할 수준이 되기 때문이다. 동양 사상의 자연관도 기왕의 환경 윤리학의 '관점'의 틀을 통해 동일차이를 설명하는 방식이 되어야 한다. 또 유학, 도가, 불교를 묶어서 '동양'이라는 틀로 설명할 것이 아니라 각각의 사상이 갖고 있는 자연에 대한 관점이 비교되어야 한다. 즉 환경 윤리학의 관점과의 동일-차이/ 유, 불, 도의 동일-차이가 종횡으로 설명된다면 기왕의 환경 윤리학을 보완 내지는 제3의 방식이 제시될 수도 있을 것이다.

• 한국환경교육학회:학술대회논문집
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• 한국환경교육학회 2003년도 전반기 정기 학술발표대회 발표논문집
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• pp.80-98
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• 2003