고온에서 HAN 계열 추진제 액적의 거동에 대한 연구

황창환(Chang Hwan Hwang),백승욱(Seung Wook Baek),한조영(Cho Young Han),김수겸(Su Kyum Kim),전형열(Hyung Yeol Jeon) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45

The droplet behavior of 83.9 wt.% HAN water solution was investigated experimentally with various ambient temperature and nitrogen environment. At the initial stage of evaporation under thermal decomposition temperature of HAN, gradual decreasing of droplet diameter was observed. After that, the droplet started to expand due to the internal pressure build up by water nucleation inside the droplet. The micro explosion was observed at higher temperature than the decomposition temperature of HAN and the remaining droplet showed similar behavior of single composition droplet. The decreasing rate was augmented as the ambient temperature increasing.

초등학생들이 체육수업 시간에 경험하는 성평등 갈등에 대한 탐구

전영한(Young Han Jeon) 한국스포츠교육학회 2023 한국스포츠교육학회지 Vol.30 No.3

본 연구는 초등학생들이 체육수업 시간에 경험하는 성평등 갈등에 대한 것을 탐구한 것이다. 수집된 자료로는 선행연구, 교사 및 학생 연구 참여자들과의 면담, 참여관찰, 기타 행정 자료 등이 있으며, 이 자료들은 김영천과 정상원(2017)이 제시하고 있는 개방형 코딩과 귀납적 범주화를 사용해 분석하였다. 연구의 결과는 다음과 같다. 수업의 계획(내용) 단계에서 교사와 학생, 학생 간의 성평등과 관련된 갈등은 발생하고 있지 않았다. 수업의 실천 단계에서는 성별에 따라 다르게 적용되는 경기 규칙, 움직이기 싫어하는 학생과 교사, 수업 기자재의 준비와 정리하기, 게임의 승패, 운동 능력의 차이, 개인감정 등이 원인이 된 성평등 갈등이 발생하고 있었다. 평가 단계에서는 남녀 간의 다른 평가 기준, 성별에 따른 과제 참여도의 차이가 성평등 갈등의 원인으로 분석되었다. 하지만 연구 참여 초등학교에서는 교사와 학생, 학생과 학생 사이의 성평등과 관련된 갈등이 성인 사회처럼 서로 강하게 대립하는 양상을 보이지는 않았다. 끝으로 성평등에 대한 학교 교육의 지속적 강화와 급변하는 사회적 상황, 학생들의 발육 발달 시기가 앞당겨짐 등을 고려했을 때 이 주제와 관련한 지속적 관심과 연구가 요구되었다. This study explores what conflict gender equality are occurring between teachers and students in elementary school physical education classes. The collected data include previous studies, interviews with teachers and student research participants, participation observation, and other administrative data, which were analyzed using the data analysis methodology presented by Kim Young-cheon and Jung Sang-won (2017) in Qualitative Research Methodology(open coding and inductive categorization). The results of the study are as follows. At the planning (content) stage of the class, there was no conflict gender equality between teachers, students, and students. In the practice stage of the class, conflicts conflict gender equality were caused by gender-specific rules, preparation and arrangement of the class, students and teachers who did not want to move or take action, the game outcome, differences in athletic ability, and personal emotions. In the evaluation stage causes of the conflict gender equality include different evaluation criteria between men and women and problems such as students who did not participate in tasks, etc. However, in elementary schools participating in the study, conflicts between teachers and students, and between students and students were divided into men and women as can be seen in adult society, and did not show a pattern of confrontation with each other. Given the ongoing need for continuous strengthening of gender equality in school education, considering the rapidly changing societal circumstances and the advancement of students growth and development, sustained interest and research are demanded in this topic.

강원도 화천군 수달(Lutra lutra) 서식지의 식생 구조

서형수 ( Hyung Soo Seo ),신영섭 ( Young Seob Shin ),이경은 ( Kyung Eun Lee ),김윤미 ( Yoon Mi Kim ),전미나 ( Mina Jeon ),남택우 ( Taek Woo Nam ),한성용 ( Sung Yong Han ),정연숙 ( Yeonsook Choung ) 한국하천호수학회 2014 생태와 환경 Vol.47 No.special

In order to determine whether vegetation would be one of the factors for the selection of otter home range, vegetation structure and other potential factors were studied in Hwacheon, Korea. Thirteen sites, otter’s activity found and not found, were investigated in North Han River and connected tributary streams of Hwacheon-gun. Three types of vegetation were classified by cluster analysis, which is short grass, tall grass and shrub type. Vegetation zone of each channel is composed of either one type, or mosaic of tall grass and shrub type. Short grass type is common in Lake Paro and upper North Han-river where water level is highly variable throughout a year. Therefore, annual species such as Persicaria nodosa, Fimbristylis dichotomam and Chenopodium ficifolium are the most dominant. Shrub type is common at the downstream sites of Jichon stream and along mainstream of North Han River down Lake Paro. A shrub species, Salix koreensis, is the most common. Tall grass type is dominant occupying the most vegetation zone of the tributary channels. Phragmites japonica is absolutely dominant. Due to its dense cover, a few plant species are co-existed. Otter activity was found in all three vegetation types and no marked activity was found at some sites of tall grass type. There is no difference in species composition and physiognomy between tall grass sites with and without otter activity, while it shows significant difference in fish availability between two groups. Overall we found that home range of otters in the region is along the mainstream and downstream of tributary streams with high fish availability in all vegetation types and in various human activity levels.

창원대생의 문화유형과 그 형성배경

전영길,양병한,정영애 창원대학교 학생생활연구소 1994 학생생활연구 Vol.7 No.-

여고생의 자아 이미지와 의복구매 행동에 관한 연구

全英信,韓明淑 服飾文化學會 1998 服飾文化硏究 Vol.6 No.1

The objective of this study is to measure self-image of adolescence, analyze empirically clothing-purchasing-behavior of adolescence and clarify correlation of two variables, self-image and clothing-purchasing-behavior, For this purpose, the techinques involve theoretical studies and researches based on historical data obtained from previous related studies and surveys. 431 high school female students who reside in Seoul are asked to answer selected survey questions to examine three aspects, clothing-purchasing-behavior, self-image and demographics. The evaluation of surveyed information is analyzed by statistical techniques to improve the accuracy of data, Statistical methods used are as follows: Descriptives (frequency, mean, percentage), Factor Analysis(varimax rotation), Crosstabs(Chi-square), T-test, One-Way ANOVA, Correlation Analysis, Reliability Analysis and Duncan's Multiple Range Test. The major results of this study were as follows : Firstly, there is a discrepancy between real self-image and ideal self-image. Furthermore more significant differences is seen from physical aspects than psychological aspects, Consequently, research proves that the difference derived from their ideal situation and leads to psychological unstableness, In addition, making their real self-image is dependent upon several elements such things as family economic level, pocket money, expenditure on clothing. Therefore, it is critical to combine all factors in order to decide how much to spend for children's clothing and pocket money in parents point of view. Secondly, research shows that there is correlated relationship between average expenditure on clothing and presence of mother's job. Average expenditure on clothing is, generally, influenced by vogue which is tend to be changed seasonally. It, also, shows that there is positive linear regression between expenditure on clothe and sensitivity for vogue. That is to say, dependent vriable, expenditure on clothing, is varied as independent variable, sensitivity for vogue, changes, Female high school students are likely to give much value on brand, moreover people who are spending more money on clothes have higher tendencies in prompt purchases than who are not. Thirdly, the analysis of clothing-purchasing-behavior and self-image shows that the difference between real self-image and ideal self-image draws the main reason of dissatisfaction after purchase of clothes. As a consequence, their unfilled needs lead them to keep making another purchase to satisfy themselves. Therefore, it is strongly recommended that parents' advices and directions on their children's money spending on clothes are imperative to establish well-behaved purchasing patterns.

尿素溶液에서의 二酸化黃의 吸收

韓英鎬,全英哲 釜山水産大學校 1984 釜山水産大學 硏究報告 Vol.24 No.2

SO₂가스를 吸收除去하는 濕式脫黃法에서 尿素를 吸收劑로 사용하였을 때 吸收劑의 濃度와 溫度에 따른 吸收能力, 吸收된 氣體 중의 SO₂의 分壓 및 吸收液 중의 SO₂의 濃度, CO₂가스의 影響등을 實驗한 結果를 要約하면 다음과 같다. 1. 吸收液으로서 蒸溜水 100 mol에 尿素 0.1 mol을 溶解시킨 것을 사용하여 SO₂가스 (3.530ppm)를 吸收시킨 結果 尿素(一酸鹽基) 1.0mol에 대하여 溫度 30℃에서는 吸收되는 SO₂量이 0.48mol 이어서 理論當量(0.5mol)과 거의 같고, 50℃에서는 0.44mol, 70℃에서는 0.35mol, 80℃에서는 0.26mol로서 理論當量의 1/2정도였다. 2. 吸收液으로서 各各 0.9mol, 1.0mol, 1.1mol, 1.2mol의 尿素를 蒸溜水 100mol에 溶解시킨 것을 사용하여 SO₂를 吸收시킨 結果 各 一定 農度 吸收液의 0.1mol씩 減少함에 따라 SO₂의 減少量은 같다. 3. 吸收液으로서 蒸溜水 100mol에 尿素 1.0mol을 용해시킨 것을 사용하여 SO₂와 CO₂를 함께 吸收시킨 結果 CO₂의 影響은 없었다. The study was carried out to investigate SO₂gas absorbing capacity using urea solution as absorbent at different conditions such as temperature and various conditions of absorbent. The effects of CO₂gas for absorbing capacity were also examined. The following results could be summarized: 1. When SO₂gas, of which initial condition was 3,530 ppm, was absorbed in absorbing solution made by dissolving 1.0 mole urea in 100 moles distilled water, at the temperature of 30, 50, 70 and 80℃, the amounts of the absorbed SO₂gas per 1.0 mole of urea were 0.48 mole at 30℃, 0.44 mole at 50℃, 0.35 mole at 70℃ and 0.26 mole at 80℃ respectively. The quantity of absorbed SO₂gas at 30℃ were nearly approached to the theocratical equivalent of 0.5 mole, while other was about half of the equivalent at 80℃. 2. The reduced quantity of the absorbed SO₂gas due to the reduction of urea concentration at every 0.1 mole unit seemed to be constant at a given temperature. 3. The result that SO₂and CO₂were absorbed to the absorbent which 1.0 mole urea were dissolved in 100 moles distilled water was that the influence of CO₂gas had no significance.

영일만에 출현하는 부유성 난과 자치어의 종조성 및 계절변화

한경호,홍지선,김영섭,전경암,김영숙,홍병규,황동식 한국어류학회 2003 韓國魚類學會誌 Vol.15 No.2

경상북도 영일만 연안에서 2001년 2월, 5월, 8월 및 11월에 계절별로 채집된 부유성 난과 자치어의 종조성 및 계절변화를 연구하였다. 채집된 부유성 난은 총 9개 분류군으로, 멸치가 출현량의 63.4%로 가장 우점하였고, 다음 까나리는 23.7%를 차지하였으며, 나머지는 7개 분류군이 12.9%를 차지하였다. 자치어는 총 7목 28과 37개의 분류군이 출현하였는데, 그 중 32개 분류군은 종 수준까지, 3개 분류군은 속 수준까지, 2개 분류군은 과 수준까지 동정하였다. 2월에는 2목 7과 12종, 5월에는 3목 5과 7종, 8월에는 6목 18과 21종, 11월에는 6목 14과 16종이 출현하였다. 주요 출현종으로서는 까나리가 자치어 출현량의 22.7%를 차지하여 가장 우점하였으며, 다음은 멸치가 16.7%, 동갈양태속 어류가 14.1%를 차지하였고, 노래미와 쥐노래미가 각각 5.7%와 5.5를 차지하였다. The ichthyoplanktons in coastal waters of Yongil Bay were sampled during four different months (February, May, August and November 2001) to study their distribution. The collected fish eggs were identified as belonging to nine species. The most dominant species Engraulis japonicus accounted for 63.4% of the total fish eggs, followed by Ammodytes personatus (23.7%) and Sardinops melanostictus (9.2%). The collected larvae and juveniles were identified into 37 taxa (28 families, 7 orders). Of these, 32 were identified to species, three were identified to genus and two were identified to family level. The dominant species Ammodytes personatus accounted for 22.7% of the total larvae and juveniles, followed by Engraulis japonicus (16.7%), and Repomucenus sp. (14.1%). These three taxa constituted 53.5% of the total collected larvae and juveniles.

정상 인체피부섬유모세포종에 대한 벤조산의 독성효과

전주원,손영우,서부일,한두석 대한본초학회 2004 大韓本草學會誌 Vol.19 No.1

Objective : The aim of this study was to evaluate cytotoxic effect of benzoic acid on normal human skin fibroblast cell line , Detroit 551. Methods : The cytotoxicity was determined by colorimetric assays such as MTT assay or XTT assay. The microscopy was carried out to observe Detroit 551 cell line. Cells were incubated with various concentrations of benzoic acid in CQ incubator controlled with 37 c for 48 hours. Results : The cytotoxic effect of benzoic acid on Detroit 551 did not show a positive significance at 50 uM and 100 uM benzoic acid by MTT assay or X T T assay compared with control. MTTB and XTTg were 900.6 uM and 974.6 uM, respectively. In microscopic study, Detroit 551 treated with benzoic acid showed a slightly decreased cell number, while the morphological changes of cell was not showed. Conclusion : Above the results, the cytotoxicity of benzoic acid was midtoxicity on normal human skin fibroblasts cell line. Detrit 551

米穀生産에서 利潤函數에 의한 規模의 經濟性 分析

전영길,한승희 안성산업대학교 1994 論文集 Vol.26 No.-

This aims at testing statistically and estimating the economies of size for each farm size. Total of 137 rice farmers at three Counties besides the Oak Gue in the Chun Buk province had been interviewed on the spot and mail-interviewed. The results are in summary as follows By using the data, the normalized, restricted, translog profit function has been applied to investigate the above mentioned purposes, based on the rejection of C-D hypothesis test at the 1% significance level. Also the co-efficients of the model has been estimated by OLS and SUR(A.Zellner,1962) under restricted and unrestricted conditions respectively. The results of parameter estimates have shown that estimation by SUR was more suitable than by OLS, and estimates under the restricted condition was statistically better than under the unrestricted. This implies, among other things, that the sample farms, on the average, maximize profits, thus supporting empirically the assumption of profit maximization. And the statistical test has been carried out to test for constant return to size to fixed factors of production. Again the hypothesis could be rejected at 3% significance, implying that the sample farmers have experienced economies of size. The estimated parameters for fixed inputs, land and machinery, have +1.3656 and +0.0231 respectively, suggesting that the economies of size be, for the most part, ascrived to land input. Referring to each farm size, only the middle farms were experiencing economies of size, but small and large farms diseconomies of size. It has been due to the enlargement of farm-size for middle farms, to added machinery and equipment for large farms.

폴리에스테르 필름의 그라프트 중합 Ⅲ

全東源,韓英淑 梨花女子大學校 韓國生活科學硏究院 1987 韓國生活科學硏究院 論叢 Vol.39 No.-

BPO를 개시제로 하여 PET필름에 스티렌 또는 스티렌/아크릴산 온합 단량체를 그라프트 공중합 시킬 때 9종의 용매를 물과 혼합하여 첨사시키고 용매의 종류, 용매의 농도, 반응온도 및 반응시간 등의 제반조건이 그라프트 공중합에 미치는 영향을 조사하였다. 용매의 종류와 첨가량에 따라서 그라프트율이 현저히 변화되는데 물만을 매체로 사용했을 때에 비해서 메탄올, 에탄올, 이소프로판올, 아세톤 등에서는 그라프트율이 상승되며 테트라클로로에탄, 클로로포름, 카본테트라클로라이드, 벤젠 벤질 알코올 등에서는 그라프트율이 오히려 저하되는데 물과 용매와의 상용성과 용매의 고유한 유전율이 가장 중요한 원인으로 작용하였다. 물과 용매의 비율이 20/80인 경우 반응온도 80∼85℃, 반응시간 6∼8시간에서 최대 그라프트율을 얻을 수 있었다. The graft polymerization of styrene and styrene/acrylic acid (AA) mixture onto polyethylene terephthalate (PET) films using benzoyl peroxide (BPO) as an initiator was carried out in the presence of various solvent/water mixture instead of the aqueous medium. The effect of solvent, solvent concentration, reaction temperature, and reaction time on grafting were studied. The kind of solvents and solvent concentration influence to the graft yield(%) significantly. Addition of methanol, ethanol, isopropanol, and acetone to the polymerization system increase graft yield as compared to the aqueous medium. But addition of tetrachloroethane, chloroform, carbontetrachloride, benzene, and benzyl alcohol decrease the graft yield. The most important factor that influence to the graft yield was the misci-bility with water and the nature of solvent dielectric constant. The highest graft yield (%) was obtained by in the 20/80, reaction temperature at 80∼85℃, and reaction time for 6∼8 hours.