• 한국수학교육학회지시리즈E:수학교육논문집
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• 제32권2호
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• pp.147-174
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• 2018

본 연구에서는 STAD 협동학습 모형을 수학교과에 적용하여 학생들의 자신감 함양 및 학습동기를 유발하여 수학적 성향 및 학습태도의 향상을 도모하고자 한다. 본 연구에서의 구체적인 목적은 아래와 같다. 첫째, 학생들의 자신감 함양 및 학습동기 유발을 위하여 STAD 협동학습 모형을 구안하고 적용한다. 둘째, STAD 협동학습 모형을 적용하여 자신감 함양 및 학습동기를 유발한 수업이 수학적 성향 및 학습태도에 미치는 효과를 검증한다. 본 연구의 구체적인 목적 달성을 위한 연구문제는 아래와 같다. 첫째, 학생들의 자신감 함양 및 학습동기 유발을 위한 수학과 STAD 협동학습 모형을 설계한다. 둘째, STAD 협동학습 모형을 적용하여 자신감 함양 및 학습동기를 유발한 수업이 수학적 성향 및 학습태도에 미치는 영향을 본 연구에서 조사한다. 결론을 다음과 같이 제시 할 수 있다. STAD 협동학습 모형을 적용하여 자신감 함양 및 학습동기를 유발한 수업을 한 집단과 전통적인 교과서 위주의 설명식 수업을 한 집단을 서로 비교 분석하여 본 결과 STAD 협동학습 모형을 적용하여 자신감 함양 및 학습동기를 유발한 수업을 한 집단에서 수학적 성향과 학습태도에 유의미한 변화가 있음을 밝혔다.

• 한국태양에너지학회 논문집
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• 제27권2호
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• pp.111-119
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• 2007

The annual mean temperature of South Korea has risen by $1.3^{\circ}C$ for last 100 years by urbanization and industrialization. Especially, the frequency of unusual hot weather in summer increases for a long time and the frequency of unusual cold weather in winter clearly decreases. In recently, The considerable portion of curtain wall system is appled to building skin in domestic. As related to this, the Korea Institute of Construction Technology devised the box typed double skin facade(It is occasionally called as FDFS : Functional Double Facade System) as an alternative that reflects the distinctive local climate and saves cooling energy. Two mock-ups($49m^*4.9m$) applied to single skin(curtain wall) and double skin each were monitored under the outdoor condition. Therefore, the characteristics of natural ventilation and cooling energy consumption of each window had been analyzed in real time. The results of this study are summarized as follow, Analysis of the experiment on an air conditioner: the indoor temperature of the chamber with FDFS is lower than that of the chamber with single skin facades by $3{\sim}6$ degrees(C). A temperature variation of about $1{\sim}2$ degrees between the 0.2m and 1.7m height of the mock-up occurs in FDFS, while that of about maximum 7 degrees occurs in single skin facade at noon with abundant intensity of solar accident. Also, 67 percent of energy consumption for air conditioning has been saved.

• Nuclear Engineering and Technology
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• 제48권4호
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• pp.881-892
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• 2016

Following the Fukushima accident and its extended station blackout, attention was brought to the importance of the spent fuel pools' (SFPs) behavior in case of a prolonged loss of the cooling system. Since then, many analytical works have been performed to estimate the timing of hypothetical fuel uncovery for various SFP types. Experimentally, however, little was done to investigate issues related to the formation of a flammable gas mixture, distribution, and stratification in the SFP building itself and to some extent assess the capability for the code to correctly predict it. This paper presents the main outcomes of the Experiments on Spent Fuel Pool (ESFP) project carried out under the auspices of Swissnuclear (Framework 2012-2013) in the PANDA facility at the Paul Scherrer Institut in Switzerland. It consists of an experimental investigation focused on hydrogen concentration build-up into a SFP building during a predefined scaled scenario for different venting positions. Tests follow a two-phase scenario. Initially steam is released to mimic the boiling of the pool followed by a helium/steam mixture release to simulate the deterioration of the oxidizing spent fuel. Results shows that while the SFP building would mainly be inerted by the presence of a high concentration of steam, the volume located below the level of the pool in adjacent rooms would maintain a high air content. The interface of the two-gas mixture presents the highest risk of flammability. Additionally, it was observed that the gas mixture could become stagnant leading locally to high hydrogen concentration while steam condenses. Overall, the experiments provide relevant information for the potentially hazardous gas distribution formed in the SFP building and hints on accident management and on eventual retrofitting measures to be implemented in the SFP building.

• Journal of Radiation Protection and Research
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• 제42권1호
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• pp.48-55
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• 2017

Background: Simultaneous detection of neutrons and gamma rays have become much more practicable, by taking advantage of good gamma-ray discrimination properties using pulse shape discrimination (PSD) technique. Recently, we introduced a commercial CLYC system in Korea, and performed an initial characterization and simulation studies for the CLYC detector system to provide references for the future implementation of the dual-mode scintillator system in various studies and applications. Materials and Methods: We evaluated a CLYC detector with 95% $^6Li$ enrichment using various gamma-ray sources and a $^{252}Cf$ neutron source, with validation of our Monte Carlo simulation results via measurement experiments. Absolute full-energy peak efficiency values were calculated for gamma-ray sources and neutron source using MCNP6 and compared with measurement experiments of the calibration sources. In addition, behavioral characteristics of neutrons were validated by comparing simulations and experiments on neutron moderation with various polyethylene (PE) moderator thicknesses. Results and Discussion: Both results showed good agreements in overall characteristics of the gamma and neutron detection efficiencies, with consistent ~20% discrepancy. Furthermore, moderation of neutrons emitted from $^{252}Cf$ showed similarities between the simulation and the experiment, in terms of their relative ratios depending on the thickness of the PE moderator. Conclusion: A CLYC detector system was characterized for its energy resolution and detection efficiency, and Monte Carlo simulations on the detector system was validated experimentally. Validation of the simulation results in overall trend of the CLYC detector behavior will provide the fundamental basis and validity of follow-up Monte Carlo simulation studies for the development of our dual-particle imager using a rotational modulation collimator.

• 대한디지털의료영상학회논문지
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• 제10권1호
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• pp.5-6
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• 2008

In this study, using an experiment, in certified an error between each system of SUV (standardized uptake value) that is one of the main analyses to diagnose a tumor in PET/CT, so, it would assure reliability and help to diagnose any lesions accurately. That is, a detailed analysis progressed. as all images reconstructed every setting time, then, clinical reliability between each system was expressed numerically at MBq/mL and SUV. Therefore, this study is considered that flexibility of follow-up using diverse system was insured, and it helps to offer accurate and beneficial information for diagnosis of various fields.

• 한국환경교육학회지:환경교육
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• 제24권3호
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• pp.1-17
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• 2011

The purpose of this study was to develop and apply the pro-environmental housing life educational program to improve of pro-environmental attitude for upper grade of elementary school and to verify its effectiveness and influence. To achieve the purpose, documentary and investigatory research was conducted and thereafter the program developed and implemented following 5 stages of analysis, design, development, implement and evaluation. The experiment was made progress as two-group pretest-posttest design, and the program was applied to a class for two hours every week in discretionary activity class for 6 weeks. A reconstructed questionnaire through Kim et al.(2000)'s test tool was used to survey the effects of students's attitudes on environment. The major results were as follows. First, the developed program focused on the main contents of pro-environmental housing life based on ESD. Second, this program had a positive effect on elementary school students' environmental attitude. Third, this program had a positive correlation(.588~.712) among the 3 subdomains of verbal commitment, actual commitment and affect. Fourth, according to qualitative analysis, students appear to be more concerned and interested in the pro-environmental housing life and environmental problem. In conclusion, the pro-environmental housing life educational program based ESD has a positive effect on elementary school students' environmental attitude. Therefore, more intensive research and follow-up study on teaching and learning methods should be highly considered.

• 자원ㆍ환경경제연구
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• 제30권1호
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• pp.1-26
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• 2021

본 논문의 목적은 그 동안 연구가 거의 진행되지 않았던 비수도권 지역의 거주자들을 대상으로 녹지공간 경제가치를 평가하는 것이다. 주거 공간의 특징이 명확하게 대비되는 비수도권 대도시와 농촌지역의 주민들이 가지는 어메니티 가치를 주택 유형별, 녹지 유형별로 비교하기 위해서 선택실험을 적용하였다. 연구 결과에 의하면, 전주시와 같은 비수도권 대도시뿐만 아니라 완주군과 같은 농촌지역에서도 녹지공간에 대한 명확한 선호가 있다는 것을 검증하였다. 아파트 거주자들의 경우 하천과 산림을 중심으로 조망의 가치는 서울시의 경우보다 작았지만, 접근성의 가치는 유사하거나 더 크게 추정되었다. 단독주택 거주자들의 경우 하천에 대한 접근성을 제외하고는 서울시보다 전주시가 월등하게 높은 어메니티 가치를 가지고 있어서, 녹지관리 정책에 있어서 그 원인과 대안의 제시가 필요해 보인다. 또한, 완주군과 같은 농촌지역에서도 녹지공간에 대한 접근성에 대한 전반적인 수요가 있어서 체계적인 관리정책이 요구된다.

• 문화기술의 융합
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• 제8권5호
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• pp.241-249
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• 2022

본 연구는 테크놀로지를 활용하여 PBL의 적용가능성을 확대한 e-PBL의 교육적 효과를 탐색하기 위하여 수행되었다. 연구 목적을 달성하기 위하여 C교육대학교의 전공 선택 교과목의 한 학기 수업활동 중 4주 분량의 활동을 체계적 설계 절차에 따라 e-PBL 활동으로 재구성하여 운영하였다. e-PBL 운영 기간 동안 참여 수강생의 반응 자료를 수집하여 분석하였다. 분석 결과 참여 수강생들은 초기의 어려움과 혼란스러움을 극복하고 점진적으로 e-PBL 활동에 동화되는 모습을 보여주었으며 전반적으로 e-PBL 활동 경험에 대하여 만족스러워했다. 참여 수강생들은 e-PBL을 통해 이루어진 실제적인 문제해결을 통해 주인의식을 갖고 활동에 참여하였고, 팀 구성원들과의 빈번한 소통과 협력을 통해 문제해결을 효율적이고 효과적으로 수행할 수 있었다. 본 연구 결과를 통해 e-PBL을 활용한 교원양성대학의 교육혁신 가능성을 확인할 수 있었다. 본 연구 성과를 바탕으로 e-PBL 적용 수업을 확대하여 분석하고 이를 통해 e-PBL의 교육적 효과를 추가적으로 검증하기 위한 후속연구가 수행될 필요가 있다.

• 인간식물환경학회지
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• 제22권3호
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• pp.255-268
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• 2019

Horticultural therapy, as a kind of complementary alternative therapies using nature as a medium, is an intervention method that can be applied to various subjects by utilizing horticultural activities that anyone can enjoy as a leisure activity. This research defined the resilience of individuals as a personal characteristic, and examined differences in the intervention effect of horticultural activities depending on the level of resilience. The results obtained in this study can be utilized in planning a horticultural activity program and setting the purpose and goals of horticultural activity programs. The subjects of this study were divided into the high resilience experimental group (Group A), the low resilience experimental Group (Group C), the high resilience control group (Group B), and the low resilience control group (Group D). The experiment was conducted in the campus of G University from September to November 2017, and the experimental group participated in the program once per week, a total of 10 sessions. The Korean version of the Connor-Davidson Resilience Scale, autonomic nervous assessment, and the interpersonal relationship change scale were carried out as pre- and post-assessment. Statistical analysis was performed using a non-parametric test. Group A showed statistically significant positive changes in relaxation of physical tension and stability. In conclusion, those with high resilience showed the higher intervention effects of horticultural activities on physical relaxation and stability than those with low resilience. However, there were some possible limitations in this study. Since the number of subjects was small and subjects were limited to college students, it is impossible to generalize the results of this study. Therefore, it is necessary to conduct follow-up studies to address and overcome these limitations.

• 한국토양비료학회지
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• 제45권6호
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• pp.877-881
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• 2012

대관령 지역에 많이 분포하고 있는 두 토양, 석비레 (Saprolite) 토양과 차항통 (Chahang series) 토양을 사용하여 경사면이 균일한 나지 토양에서 경사도 0.5, 7, 15, 30%와 강우강도 20, 60, $90mm\;hr^{-1}$의 조합으로 12처리를 하여 토양 유실에 대한 인공강우실험을 하였다. 그 결과를 요약하면 다음과 같다. 석비레 (Saprolite) 토양에서는 경사도 7% 까지는 토양유실이 적게 나타나다가 7% 이상의 경사면에서는 급격하게 증가하였고 차항통 (Chahang series) 토양은 경사도, 강우강도 증가와 함께 유실이 점증하였고, 경사도와 강우강도가 적은조합에서도 유실이 다소 크게 나타났다. 경사도 15, 30%와 강우강도 60, 90mm/hr의 조합처리에서는 두 토양 모두 토양유실이 크게 일어나고, 두 토양 간에 큰 차이는 없었다. 차항통 (Chahang series) 토양은 경사도, 강우강도가 적은 조합에서도 유실이 일어날 위험성이 크므로 토양관리에 주의를 요한다.