6-hydmxydopamine 파킨슨병 모델에서 Apomorphine의 투여에 따른 회전운동 변화의 시간적 추이

홍근식,김병곤,전범석,윤병우,이광우,노재규,이상복,명호진 대한신경과학회 1999 대한신경과학회지 Vol.17 No.1

힘과 운동 관련 선 그래프 해석과 이해에 관한 학생들의 오류 유형 검사 도구의 개발

문충식,김범기 한국교원대학교 과학교육연구소 1999 청람과학교육연구논총 Vol.9 No.1

선 그래프의 논리적이고 상징적인 특징 때문에 선 그래프는 과학, 특히, 물리에서 유용하고 중요한 수단으로 활용되고 있다. 그러나 학생들은 그래프를 해석하고 이해하는 데에 상당한 어려움이 존재한다. 본 연구는 힘과 운동 관련 선 그래프 해석과 이해에 관한 학생들의 어려움을 조사하기 위하여 면담 연구 등의 선행 연구에서 산발적으로 개발되어 사용되고 있는 문항을 바탕으로 신뢰롭고 타당한 검사 도구를 개발하는 것이다. 본 연구에서 개발된 힘과 운동 관련 선 그래프 해석과 이해에 관한 검사도구는 물리 교육과 과학 교육을 전공하는 대학원생들과의 세미나를 통하여 문항 목표와 문항 내용 그리고 내용 타당도를 검토하였으며, 3차에 걸친 예비 검사를 통하여 문항의 변별도와 신뢰도를 검토하였다. 검사 도구의 신뢰도(KR-20)는 0.92이고, 변별도 평균은 0.46이다. Line graphs are important in science, especially, in physics because of their logical and symbolic characteristics. However, students have difficulty interpreting and understanding line graphs. The aim of this study was to develop a reliable and valid instrument for identifying various problems with students' interpreting and understanding line graphs based on the items which had been used in previous studies, such as interviews and pencil and paper tests. The objective of the study and the contents of the items were identified through seminars attended by graduate students with science and physics education majors, Also, the reliability and the descriptive index of the items were tested three times through pilot tests. The reliability (KR-20) of this instrument was 0.92, and the average was 0.46.

Fe-Sn系 燒結合金의 諸性質에 미치는 Sn粉의 粒度 및 配合量의 影響

홍범식,김윤채 三陟大學校 1997 論文集 Vol.30 No.1

Effects of particle size and content of tin powder on the properties of iron-tin sintered alloy for porous bearing were investigated in comparison with those of iron powder compact. The results obtained are as follows; 1) The effect of particle size of tin powder : When the particle size becomes finer, the compact shrinks a little and pore-structure becomes finer and then, the strength increases considerably. 2) The effect of tin powder content : When content of tin powder increases, the compact expands a little and also the pore-structure grows a little. But the strength decreases especially with increasing of the tin content above 1.5wt&. Therefore, it is desirable that the particle size is -350mesh and the content is about 1.0wt%.

數値解析을 利用한 粘性土地盤에서의 Retaining Wall의 擧動에 關한 硏究(Ⅰ)

劉範植,金仁培 안성산업대학교 1989 論文集 Vol.21 No.-

This paper deals with the behavior of retaining wall on soil condition and wall stiffness in clay soils. The results of study are as follows. 1. The passive earth pressure in low stiffness sheet pile is larger than it in high stiffness diaphram wall and elasto-plastic limit depth is deepened at the excavation depth of 5.5m above. 2. The deflection in deaphragm wall is more small than sheet pile and the more cohesion increased without relating wall stiffness, the more max, deflection is decreased, also, bending moment in deaphragm wall is lager than sheet pile. 3. When the retaining wall in clay in designed, there is need to design by introducing earth pressure modeling of elasto-plastic equilibrium state.

시멘트기초법에 의한 重金屬 固定效果에 關한 硏究

劉範植,金仁培 안성산업대학교 1994 論文集 Vol.26 No.-

This research evaluated Compressive Strength characteristic and Heavy Metal fixation by Cement-Based Solidification of waste. The Compressive Strength of solidified samples are related to Heavy Metal Elution and the more Compressive Strength is high, the more Heavy Metal is fixed. The Effect of Heavy Metal Fixation is high, specially at above 15% of stabilizer addition. The Compressive Strength is increased with curing times and stabilizer addition. Amount of Heavy Metal Elution by TCLP Method is higher than KSM Method because it is difference of experimental rule.

다짐한 不飽和 粘性土의 剪斷 强度 特性에 관한 硏究

劉範植 안성산업대학교 1992 論文集 Vol.24 No.-

This study carried out to investigate characteristics of compacted unsaturated cohesive soils widely used for construction of fill dam, road, residential and industrual site. It is performed undrained unconsolidation compression test, isotropic triaxial compression test and average principal stress test in constant condition. Testing conditions are ; 1) dry density is constant, variable water content, 2) water content is constant, variable dry density. The results of study are as follows ; 1. The stress conditions in triaxial compression test are considered average principal stress component and purely shear component. 2. The shear stress of soil used in evaluated smaller about 20% in accordance with correction of volumetric strain by shear component. 3. Volumetric change in accordance with average principal stress increment are corrected by time effect only considered, exist doubt on a propriety. 4. The difficult problem in unsaturated soil on theory are remained today, therefore this results are useful for analysis of unsaturated soils behaviour.

경사하중이 작용하는 연약지반의 압밀침하 산정에 관한 연구

박춘식,장정욱,김범수 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

This study determined consolidation settlement in soft ground with the tilted load by means of Terzaghi's one-dimensional consolidation theory and FEM. It was also compared with field measured value. The conclusions are summarized in the following. ⅰ) The consolidation settlement from Terzaghi's one-dimensional consolidation theory differ considerably from the measured value, but showed almost similar to that from FEM. ⅱ) Terzaghi's one-dimensional consolidation theory showed variable consolidation settlement according to methods to obtain △P. ⅲ) Consolidation settlement determined by FEM turned out to better evaluate the field settlement than Terzaghi's one-dimensional consolidation theory.

벽체의 뒷채움이 제한되어 있는 경우의 토압산정이론식

유범식,김훈제 안성산업대학교 1996 論文集 Vol.28 No.-

In case that the length of Backfill behind wall is confined, the active earth pressure acting wall will be reduced as compare with that calculated by conventional active earth pressure theories. Consequently, in this research , the theoritical formula of active earth pressure is proposed and conclusions are following. The angle of failure plane, 'α' of backfill soil is inclined to reduce as 'B/H' increase regardless of the angle of internal friction of backfill soil and earth pressure increase as the angle of internal friction reduce. The reduction effect of active earth pressure according to backfill length increase as 'B/H' more reduce than 'B/H=0.6'.

선 그래프 해석과 이해의 지각·인지 과정에 관한 모형 : 힘과 운동 관련 선 그래프를 중심으로

문충식,김범기 한국교원대학교 과학교육연구소 1998 청람과학교육연구논총 Vol.8 No.1

선그래프는 과학에서 정보를 전달하는 수단으로써 뿐만 아니라 실험의 결과를 해석하는 수단으로 유용하게 활용된다. 그러나 학생들은 그래프의 시각적이면서도 추상적인 특징 때문에 해석이나 이해에 상당한 어려움이 있다. 따라서 선그래프 이해의 지각ㆍ인지 과정을 분석하는 것이 매우 중요하다. 본 연구의 목적은 선그래프 해석과 이해에 관한 지각ㆍ인지 과정에서의 한 모형을 제시하는 것이다. 이 모형은 Pinker의 그래프 도식 이론과 Fisher의 정보 처리 이론에 기초를 두고 있으며, Lohse, Shah, Winn 등의 연구를 참고하여 제시하였다. 그리고 이 모형의 특징은 선그래프 문제를 해결하는 과정을 내용 독립적인 선그래프 해석과정과 내용 의존적인 선그래프 이해과정으로 나누었다. Line graphs are particularly effective in communicating relationships. They can convey vast amounts of information that cannot be communicated effectively by words or numbers alone. Thus, line graphs allow us to communicate scientific information and to see scientific data analyses. However, students are weak in their ability to comprehend line graphs because the features of line graphs are visual and abstract. McDermott et al. (1983) have shown that this is a problem even for many university students in the sciences. Then, it is very important to analyze the perceptual and cognitive processes in the comprehension of line graphs. The purpose of this study is to propose a model of line graph comprehension that includes perceptual and cognitive processes. This model is based on the graph schema theory of Pinker (1990) and the information processing theory of Fisher (1992). The major processes are the interpretation process and the comprehension process. In the interpretation process of line graphs, defined that the visual information of graphs is assimilated with the graph schema and is simultaneously accommodated to graph schema. The comprehension process of line graphs is one in which the result of the graph interpretation is assimilated with the existing conceptual schema on graphs and is simultaneously accommodated to the existing conceptual schema on graphs.

粘性土의 一次元壓密에 관한 實驗的 硏究

劉範植,趙成敏 안성산업대학교 1993 論文集 Vol.25 No.-

Many scholars studied about the consolidation character of clay through oedometer test to find out the various phenomena. These studies can be explained by Terzaghi's consolidation theory, the effective stress theory studied by Gibson and Mikasa, Hansbo's theory about critical hydraulic gradient and Mitchell's clogging phenomenon. These researches could not explain the consolidation behavior adequately because of the unskilled manufaturing techniques of test apparatus. So the research of one-dimensional consolidation using adequate consolidometer is needed to get the more precise results. This paper analyzes the one-dimensional consolidation behavior through the loading, unloading and reloading using the oedometer test and triaxial compression consolidometer Generally, it is hard to get the precise stress path and the consolidation behavior of the each part of the specimen by odeometer because of the effect of side friction and unsaturation. To reduce these problems, the specimen is saturated by the increase of the back pressure during the unloading. Using this specimen, the test of normal consolidation and overconsolidation is analyzed. The results strongly support the principle of effective stress. Under the normal consolidation, the coefficient of compression Cc is constant regardless of the loading stages, but the 24-hour compression curve is nonlinear under the overconsolidation. therefore, the constitutive equation under the normal consolidation can not be applied to that under the overconsolidation.