• Journal of the Korean Statistical Society
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• 제23권2호
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• pp.271-292
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• 1994

The comparison of statistical experiments with a common parameter and parameter space is discussed using the concept of the Blackwell's sufficiency and the Shannon's entropy. Binomial and censored experiments are considered as applications. The loss of information is studied under teh aggregated experiments and truncated experiments, and summerized in some tables which make it possible to indicate the choice of an appropriate experiment.

• 대한지구과학교육학회지
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• 제13권1호
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• pp.53-63
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• 2020

본 연구는 2019년도에 적용 2년차를 맞이한 고등학교 과학과 공통과목인 통합과학과 과학탐구실험의 2차 년도 적용 현황을 분석하고 이를 토대로 향후 과학과 고등학교 교육과정 개발을 위한 제언을 도출하는 것을 목적으로 한다. 이를 위해 총244개의 과학중점고와 일반고를 대상으로 설문조사를 실시한 결과를 2018년도 1차 년도 조사결과와 양적으로 비교하였다. 또한 초점집단을 구성하는 9명의 과학교사들과 심층면담을 실시하여 2차 년도 적용현황에 대한 심층 답변을 논의하였다. 연구결과에 따르면, 1차 년도와 마찬가지로 적용 2년차에도 통합과학은 대부분 6~8단위로 운영하고 있었으며, 학급당 통합과학을 담당하는 교사는 3~4명이 대부분인 것으로 나타났다. 교사 초점집단 면담에서 현장교사들은 통합과학이 통합적 지도를 필요로 하며 학생의 흥미와 관심 유발에도 좋지만, 평가공정성 확보 등의 문제로 과정중심 평가 등을 구현하기는 어렵다고 주장하였다. 과학탐구실험의 경우 대부분 학기당 1단위로 2개 학기로 운영하고 있었으며, 가르치는 사람이 달라서 통합과학과 과학탐구실험을 거의 연계하지 않는 것으로 나타났다. 2019년도부터 과학탐구실험의 학교생활기록 기재 방식이 절대평가로 변경되어서 상대평가로 성적산출을 하지 않아도 되므로 학생들의 만족도나 수업의 흐름이 기대한 것보다 훨씬 좋고, 부담없이 가르칠 수 있다고 교사들은 말하였다. 연구결과를 토대로 과학과 공통과목인 통합과학과 과학탐구실험 교육과정 안착을 위한 지원방안, 차기 과학과 교육과정 개정에서 통합과학과 과학탐구실험 과목의 개선 방안 등을 제안하였다.

• 한국과학교육학회지
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• 제25권3호
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• pp.346-352
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• 2005

이 연구에서는 문제 해결을 강조한 탐구적 일반화학 실험을 개발하여 그 적용 효과와 학생들의 실험에 참여하는 태도에 미치는 영향을 알아보는데 목적을 두고 있다. 문제 해결을 강조한 일반화학 실험이 실험에 참여하는 태도 변화에 효과가 있었는데, 맹목적 참여자에서 비판적 참여자로 변화한 수가 실험집단에서 3배 가까이 많았다. 또한, 차별성 인식, 탐구 정도, 토론의 유용성 부분에서 유의미한 차이를 보였다.

• 한국초등과학교육학회지:초등과학교육
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• 제37권1호
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• pp.12-26
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• 2018

The purpose of this study was to investigate the characteristics of reasoning in which $3^{rd}$ grade elementary school students form ideas, design experiments, and interpret the results to solve problems in small group argumentation. For this purpose, 12 3rd-grade students' small group argumentations including experiments were observed. The researchers analyzed students' pre- and post-open questionnaires, field notes, and video recordings of small group argumentation. The results of the research are as follows. First, in the initial opinion formation process, a hasty unification of opinions and a transformation of inquiry problem occurred. In the design and execution of experiments, verification experiments and unplanned and arbitrary experiments were performed. They also selectively noticed or accepted claims, evidence, interpretation, and criticism. They could distinguish between the condition and the cause, but they were confused by using inaccurate terms and tended to keep the initial opinions when interpreting the results and drawing conclusions.

• 펄프종이기술
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• 제48권3호
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• pp.5-13
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• 2016

This study investigated the effects of different factors on the migration of a fluorescent whitening agent (FWA) from paper treated with FWAs to non-fluorescent papers. FWA migration experiments were carried out in vertical and friction contacts between the papers dyed with FWAs and non-fluorescent papers. During the experiments, we identified the effects of the addition and types of FWAs, contact time, temperature, and relative humidity (RH) on FWA migration. The fluorescence indices of the non-fluorescent papers were measured before and after the migration experiments, and the Student's t test, a statistical tool, was utilized to compare results from different migration experiments. In vertical contact experiments, FWA migration to non-fluorescent paper was observed at $30^{\circ}C$ and 70% RH; this was attributed to the high moisture content of the paper. FWA migration did not occur significantly at $23^{\circ}C$ and 50% RH. In the friction contact experiments, FWA migrations were identified at both temperature conditions and RH percentages. The addition and types of FWAs did not increase the fluorescence index of non-fluorescent papers. Therefore, it was concluded that the moisture content of paper and the friction contact affected FWA migration from the papers containing internal and surface FWAs.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2008년도 춘계학술논문발표회 논문집
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• pp.251-254
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• 2008

The fact that the major cases of life casualties are from smoke in the fire accidents and the expected steep increase of skyscrapers, huge spaces, multiplexes and huge scaled underground spaces demand establishment of efficient smoke countermeasure. The field experiments on two high buildings of 20 stories and 21 stories are carried out to evaluate the field performance of pressure differential systems for smoke management and the results of experiments are presented.

• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 2005년도 춘계 학술발표회 논문집
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• pp.174-174
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• 2005

• 한국자기공명학회논문지
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• 제19권3호
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• pp.112-118
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• 2015

Hsp31 protein is one of the members of DJ-1 superfamily proteins and has a dimeric structure of which molecular weight (MW) is 62 kDa. The mutation of DJ-1 is closely related to early onset of Parkinson's disease. Hsp31 displays $Zn^{+2}$-binding activity and was first reported to be a holding chaperone in E. coli. Its additional glyoxalase III active has recently been characterized. Moreover, an incubation at $60^{\circ}C$ induces Hsp31 protein to form a high MW oligomer (HMW) in vitro, which accomplishes an elevated holding chaperone activity. The NMR technique is elegant method to probe any local or global structural change of a protein in responses to environmental stresses (heat, pH, and metal). Although the presence of the backbone chemical shifts (bbCSs) is a prerequisite for detailed NMR analyses of the structural changes, general HSQC-based triple resonance experiments could not be used for 62 kDa Hsp31 protein. Here, we prepared the per-deuterated Hsp31 and performed the TROSY-based triple resonance experiments for the bbCSs assignment. Here, detailed processes of per-deuteration and the NMR experiments are described for other similar NMR approaches.

• Structural Engineering and Mechanics
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• 제77권3호
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• pp.305-314
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• 2021

In order to reduce enormous cost of real-scale underwater explosion experiments on ships, the mechanical response of the ships have been analyzed by combining scaled-down experiments and Hopkinson's scaling law. However, the Hopkinson's scaling law is applicable only if all variables vary in an identical ratio; for example, thickness of ship, size of explosive, and distance between the explosive and the ship should vary with same ratio. Unfortunately, it is infeasible to meet such uniform scaling requirement because of environmental conditions and limitations in manufacturing scaled model systems. For the facile application of the scaling analysis, we propose a generalized scaling law that is applicable for non-uniform scaling cases in which different parts of the experiments are scaled in different ratios compared to the real-scale experiments. In order to establish such a generalized scaling law, we conducted a parametric study based on numerical simulations, and validated it with experiments and simulations. This study confirms that the initial peak value of response variables in a real-scale experiment can be predicted even when we perform a scaled experiment composed of different scaling ratios for each experimental variable.

• 과학교육연구지
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• 제44권2호
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• pp.197-204
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• 2020

이 논문에서는 2차원 미학적 모델의 적합성과 유용성을 찾기 위하여 과학자들이 아름답게 생각하는 10가지 과학 실험들을 과학의 미학적 공간에 표상하였고 동시에 10가지 과학 실험을 바탕으로 과학 실험의 그림을 함께 제시하는 리커트 척도의 측정 도구를 개발할 수 있었다. 이를 통해 과학의 미학적 모델을 기반으로 과학의 본성을 지도하는 방안과 그 방안의 효과 측정에 대한 활용 가능성을 제안하는 바이다.