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개념도 작성이 예비 초등교사들의 과학 교수 효능감과 과학 학습관에 미치는 효과
홍정림,김재영 한국초등과학교육학회 2003 초등과학교육 Vol.22 No.3
This study is to find out effects of concept mapping on preservice elementary school teachers' self-efficacy for teaching and learning views on science. Teachers are majoring as elementary school teachers in college and experienced reflective thinking in the process of making concept maps before teaching and designing instructions. Activity of making concept maps before they have to teach and make designing instructions have positive effect on enhancing level of self-efficacy in science teaching and constructivist learning view centered on active learning processes of learners.
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염수분무 환경에서 알루미늄-크롬 용융도금강판의 부식생성물이 내식성에 미치는 영향
임병문,홍승현,정재인,최장현,정원섭 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.10
The effect of corrosion products of hot-dip Al-Cr steel sheet on the corrosion resistance were investigated. The results of XRD and XPS measurements showed that there was not found a hydroxide type corrosion product on the surface of aluminized steel after salt spray test(SST) but there was found some cracks in the surface layer which accelerates corrosion during SST. In Al-Cr coated steel case, the main phase of the corrosion products after salt spray test was found to be Al(OH)₃. The polalization curves of aluminized steel after SST shows that there was no passivation layer. For the Al coated layer, a porosity in the Al-oxide film on the surface layer leads to preferential corrosion. After the Al coated layer was completely removed, the Al_(5)Fe₂layer was selectively corroded and then, the steel substrate was exposed to the electrolyte. However, the polalization curves of Al-Cr coated steel after SST shows that the passivation layer was formed, which could increase the corrosion resistance of Al-Cr coated steel. In case of the Al-Cr coated layer, the densely covered hydroxide layer of Al(OH)₃and the intermetallic compound layer of Al_(13)Cr₂became a barrier against further corrosion after the Al layer was removed. In this case, corrosion was not proceeded even through the same current density. The densely covered hydroxide of Al(OH)₃and the intermetallic compound layer of Al_(13)Cr₂were considered to be one of the reasons of high corrosion resistance for Al-Cr coating.
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임영식,이홍재,이도진,허종수,손보균,조주식 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12
This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using ozonation process. For raw water, Nakdong River was used. By conducting batch test of ozonation efficiencies of the ozonation were 94 to 92%, respectively. Removal efficiencies of single VOC compound or mixed VOC compounds in the raw water were 80% to 90% by the ozonation with 2 mg/ℓ dosage and 10 minutes contact time. Removal efficiencies of ABS by the ozonation with 1 mg/ℓ, 3 mg/ℓ dosage and 20 minutes contact time were 83% to 96%, respectively. Almost 67% of chlorophyll-a at the concentration of 38.㎍/ℓ was removed by ozonation at ozone dosage of 1mg/ℓ for 20 min. considering the efficiency of ozone utilization and water treatment, the most effective ozonation could be obtained with high ozone dosage and short and short contact time.
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홍장표,임희용,이재학 龍仁大學校 武道硏究所 1998 武道硏究所誌 Vol.9 No.1
This study is aimed at finding a possibility to make folk game developed as the traditional physical education by classifying folk game types in terms of the physical education on the basis of preceding studies and literatures, and preparing the foundation of a physical education historical study of folk games. To let folk games and the physical education approached, folk games was generally classified by realms of amusements and military sports, and a realm of a physical education historical study by amusements and military. Amusements were classified by united games/groups/individuals, and martial arts by military sports/martial arts. S study on united games out of amusements in the physical education history is extremely poor. A study on traditional physical exercises conforming to the purpose not only for the individual harmony of group lives but also for the harmony and combination of groups out of targets of physical education activities intended by the modern physical education is required, and most individual amusements are in the brink of disappearing due to the mechanical civilization these days. In the end, a study on traditional games in the physical education history may form a new game culture required by the modern society, and so their restoration as one of life physical educations is urgently required. A study realm of military arts was classified by military sports martial arts, the physical education historical study for development courses/forms/methods of traditional/drilling military arts is required. Such a traditional/drilling study still be the important data to find the intrinsic meaning of martial arts. However most studies are performed on the center of martial arts converted into now sport events.
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임영성,강관호,이홍재,서동철,허종수,손보균,조주식 한국환경농학회 2002 한국환경농학회지 Vol.21 No.3
상수원수를 보다 효과적으로 처리함으로서 양질의 수돗물을 공급하기 위한 기초자료를 얻고자 낙동강 상수원수를 대상으로 활성탄처리에 의한 공탐체류시간 및 활성탄 여층 깊이에 따른 수처리 효율과 생물활성탄으로서의 이용 가능성을 조사한 결과는 다음과 같다. 공탑체류시간(EBCT)에 따른 수처리 효율은 EBCT가 증가할수록 증가되었으나 운전시간이 경과함에 따라 활성탄 흡착능력은 감소되어 처리효율도 서서히 감소하였다. 활성탄 여층깊이에 따른 pH 변화는 활성탄 층 깊이에 따라 거의 없었으며, D0는 활성탄 층 깊이가 깊을수록 서서히 감소하였다. KMnO^4 소비량, UV254 흡광물질 DOC 및 THMFP 처리효율은 활성만 표층으로부터 하부로 내려갈수록 증가하였으며, 운전시간이 경과할수록 활성탄 상층부에 형성되어 있던 흡착대파 하부로 이동하였다. DOC의 상당 부분이 활성탄여과지에 서식하는 미생물 작용에 의해 분해 제거되는 것으로 나타났으며, 운전개시 126일 후의 BAC에서 활성탄 표층으로 부터깊이 20 cm 부근에 미생물이 1.1*10^7 cell/cm^3 이상 존재하는 것으로 관찰되어 생물활성탄 조건을 만족시키고 있었다. This study was carried out to evaluate the pollutant removal efficiencies of the advanced drinking water treatment using mated carbon process. For raw water, Nakdong river was used. From the activated carbon adsorption experiment, the following results were obtained. The efficiency of water treatment enhanced with increase in empty bed contact time. Variation of pH was not detected to the bed depth, but DO content gradually decreased with the bed depth, Removal efficiency of KMnO₄ consumption, UV254 absorption, DOC and THMFP also were increased by increasing in the bed depth. Transition of adsorption zone from upper parts of the bed to the lower parts were detected as treatment periods increased. Large portion of DOCs were degraded and removed by the microbes growing on the surface of activated carbons. Cell numbers of microbes were estimated over 1.1 × 10 exp(7) cell/㎤ at the depth of 20 ㎝ from the surface 126 days after starting operation. The results shown that the activated carbon filter was successfully acted as a biofilm filter.
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林再澤,鄭弘燮 釜山大學校 學生生活硏究所 1982 硏究報 Vol.18 No.1
The present study is an attempt to find some informations of the under-graduate students who were probated or dismissed by BNU for unsatisfactory academic reasons since the Graduation Quota Policy. The variables considered in this research were several life backgrounds, college entrance examination score, attitudinal characteristics, and personality of the students. The subjects were 1961 students (1330 freshmen and 631 sophmores) who were probated or dismissed by the BNU regulations for Spring and Fall semesters of Academic Year 1981 and Spring semester of Academic Year 1982. The Groduation Quota Policy refers to a new educational system in which, out of 130% of college entrees, only 100% of the students are supposed to be given bacelers degree, whereas the rest of students (30%) are supposed to drop out of college programs since the Academic Year 1981 in case of every College and University in Korea. According to the implementation of this policy. students with a cumulative undergraduate course average below 1.8, or two or more grade F for two or more times before the graduation of the college are removed their name from the register by the school. The life backgrounds and the attitudinal characteristics of the subject were measured on the questionaries which were established by the Student Guidance Center at BNU, and their Personality Characteristics were measured on the Standardized Personality Diagnostic Test by Sang Ro Lee et al. These data including the subjects' college Enterance examination scores were collected at the beginning of the subjects' college entrance. As a reference, we constrasted some variables of the subjects with those of the other equivalent students including the subjects at BNU. The major findings are as follows: 1) The students who were probated or dismissed for unsatisfactory academic reasons after implementation of Grduation Quota System relatively increased more than those before the implementation of Graduation Quota System, that is, 11.7% to 1.8%, 11.2% to 1.9%, and 10.3% to 0.8% at Spring and Fall semesters of Academic Year 1981 and Spring semester of the Academic Year 1982 respectively. 2) By the analysis of data in terms of the place of residence family atmosphere, and socio-economic status, there were no significant difference between the distribution of the subjects and that of the other equivalent general students. But the propotion of the rural subjects were significantly higher that of urban subjects on the .005 level of significance. 3) There were no significant differences between the distribution of the subjects and that of the other general students according to the liberal high schools and the specialized high schools including commercial, technical, agricultural schools. 4) The less college entrance examination scores the subjects earned, the higher proportion of them were probated or dismissed by BNU concerned for unsatisfactory academic performance reasons. 5) There were a little significant relations between college entrance examination score and the subjects involved. That is, the subjects who have earned less college entrance examination scores appeared more dominant in the order of humannities, physical sciences, social sciences, engineering, and arts area. 6) Students who earned the college entrance examination scores under the lower 30 percentile in each department were equal to 41.9% of all the probated and dismissed students. and the propotion of the subjects who were higher than 20 percentile of college entrance examination score distribution of the whole students each department appeared 9.8 percent of the total subjects. 7) Where were no significant differences between the distribution of the subjects and that of the other general students in terms of types of perception of the social problems, levels of satisfaoften with their areas of study, level of interest in circle activities, and personality traits
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