學生用 自動記錄計에 關한 硏究

崔錫南,姜庸煥 공주대학교 사범대학 과학교육연구소 1981 과학교육연구 Vol.13 No.1

A low cost student type recorder have been developed for measurement of temperature of chemical system. This instrument measure a temperature range from 0℃ to 100℃ And this instrument could be applied to measure the thermochemical reaction.

[논문]실험시설 기초의 진동사용성 분석

최형석,전법규,김남식,정진환 釜山大學校生産技術硏究所 2007 生産技術硏究所論文集 Vol.66 No.-

건물에 작용하는 진동하중은 구조물 자체의 성능에 영향을 미칠 뿐만 아니라 거주하는 사람이나 작업기계 동에 나쁜 영향을 가져올 수 있다. 본 연구에서는 이러한 진동에 대한 영향을 평가하는 국내외의 기준에 대하여 고찰하고 다양한 하중과 주파수 대역에서 실험이 가능한 대형지진모사 실험센터에 대한 진동영향 평가를 수행하여 사용성 저하 여부를 확인하였다.

기-액 계면에서 고분자용액의 거동 및 박막의 구조특성

南錫泰,崔成符 龍仁大學校 1993 용인대학교 논문집 Vol.9 No.-

본 연구는 수면전개법으로 고분자 박막을 제조하기 위한 연구로서 셀룰로즈아세테이트(CA), 폴리염화비닐(PVC), 폴리스티렌(PS) 용액의 수면전개 거동과 생성된 박막의 구조특성을 검토하였다. 고분자용액의 수면전개성은 고분자용액의 용매선정에 따른 표면장력, 점도의 변화와 고분자의 농도변화에 따라 영향을 받았다. 또한 수면온도가 증가함에 따라 전개성은 저하되었다. 수면전개 박막의 구조는 고분자농도가 증가할수록 치밀하였으며, 막의 응집상태는 공기면측과 수면측이 다르게 나타나 공기면측의 상태가 다소 치밀하였다. 또한 수면의 온도가 증가할수록 막의 구조는 더 치밀함을 보였다. 혼합박막의 구조는 공기면측에 소수성의 PS가, 수면측에 는 친수성인 PVC가 배향된 직렬혼합구조였으며, 한편 3 wt%의 CA 용액으로부터 0.1㎛의 두께를 갖는 박막을 얻었다. The ultrathin membranes of Cellulose Acetate,Polyvinylchloride and Polystyrene were prepared by the method of water -casting. The spreading ability of polymer solutions on water was decreased with increasing the surface tention and the viscosity of polymer solutions, and the temperature of water surface, respectively. The aggregation states of water -casting membranes were more dense as increasing the concentration of polymer solutions and the temperature of water surface. The surface structure of the air sides showed more dense than that of the water sides. The structure of polyblend laminated membranes showed series model, where PS rich phase was formed at air side and PVC rich phase was at water side. In the case of the 3 wt% Cellulose Acetate /Acetone system, the thickness of the membrane was about 0.1㎛.

50% 아세토니트릴 수용액에서 p-Nitrotoluene의 전기화학적 환원

최석남,박병빈,한명종 공주대학교 사범대학 과학교육연구소 1998 과학교육연구 Vol.29 No.1

순환전압전류법과 조절전위전기분해법을 이용하여 50% 아세토니트릴 수용매에서 p-nitrotoluene의 전기화학적 거동을 연구하였다. p-nitrotoluene은 50% 아세토니트릴 수용매에서 1전자 2단계 환원 반응을 나타내었다. 순환 전압 전류법으로 전극전위, 산화봉우리와 환원봉우리 전류, 전류함수값, 봉우리전위를 살펴본 결과 p-nitrotoluene의 환원반응에서 1 환원파는 확산지배적인 반응이나 2 환원파는 약간의 반응성 전류가 포함된 반응으로 나타났다. 순환전압전류법에서 제 1 환원파는 유사 가역적이었으며, 제 2 환원파는 가역성에서 벗어나 비가역적임이었다. 정전위 분해 결과와 생성물 분석을 통하여 p-nitrotoluene 1전자 2단계 환원을 하며 환원생성물은 4, 4´-dimethylazobenzene이 되는 것을 알 수 있다. The electrochemical behaviors of p-nitrotoluene in 50% acetonitrile aqueous solution were studied by using a cyclic voltammetry and a controlled potential coulometry. In 50% acetonitrile aqueous solution, the reduction of p-nitrotoluene proceeded two one-electron step. In order to investigate of the type of reduction current at every reduction step, dependencies of peak current on the scan rate and concentration of p-Nitrotoluene have been examined. The results were shown that the 1st reduction wave was considerably diffusion controlled reaction and the 2nd one contained a little kinetic current. From the cyclic voltammetry it was investigated peak current and peak potential, it found that the 1st reduction wave was quasi-reversible and the 2nd one was irreversible. In orther to explain the reduction mechanism, the number of the electrons for each reduction step was measured by controlled potential coulometric techanique and the electrolysis products were identified by UV spectroscopy. The result was shown that the reduction of p-nitrotoluene proceeds to give the corresponding azo compound, 4, 4´-dimethylazobenzene

忠淸地域鑛泉水(藥水)의 成分調査(Ⅱ)

崔錫南,韓麟傳 공주대학교 사범대학 과학교육연구소 1979 과학교육연구 Vol.11 No.1

This study was dealt with the water quality of the most famous six mineral springs and one warm spring located in Chung-chung district, near Dae-jon. Tests were made three times in July and Octover, 1978 and in December, 1979. Testes were included twenty two itemes. The obtained results were summerized as follows. 1. The quality of mineral water at six places new overwhelm the limitation of drinking water. 2. But, these were rather proper for the specific drinking water at Bu-gang for illness just like Fe is good for the anaemia. 3. The quality of the mineral water at Cho-jeong was good and proper for making soda drinks.

데침조건에 따른 참나물의 생리활성 성분 변화

최남순,오상석,이종미 한국식생활문화학회 2001 韓國食生活文化學會誌 Vol.16 No.4

Wild edible plants are consumed as raw and/or processed. Analytical data for raw biologically functional compounds were relatively well established. The changes on functional compounds during processing are, however, not well studied. This study was carried out to investigate the change of the quality of wild edible plants, Pimpinella brachycarpa(Chamnamul) at various conditions. Samples were blanched at the salt concentration of 0%, 1% or 2% for 1, 2, and 3 minutes each. The biologically active compounds, vitamin C, β-carotene, chlorophyll, flavonoids, polyphenols and minerals were analyzed. The concentration of vitamin C in Chamnamul decreased as blanching time increased. Beta-carotene in Chamnamul showed high concentration when Chamnamul was treated under longer blanching time. Higher salt concentration of blanching water, however, resulted in the increased concentration of β-carotene in the blanched Chamnamul. Higher salt concentration of blanching water also reduced the loss of total flavonoids and total polyphenols from the blanched Chamnamul. The change of colors in the blanching water seemed to be corresponding to those of total flavonoids and total polyphenols concentrations in the blanching water.

p-Nitrocinnamaldehyde의 가수분해 반응 메카니즘에 관한 반응속도론적 연구

최석남,윤세중,홍춘표 공주대학교 사범대학 과학교육연구소 1984 과학교육연구 Vol.16 No.1

The rate constants of the hydrolysis of p-nitrocinnamaldehyde were determined by ultraviolet spectrophotometer, and a rate equation which could be applied over wide range of pH was obtained. The reaction machanism of hydrolysis of p-nitrocinnamaldehyde especially the catalytic contribution of hydroxide ion, hydroxide ion and water which was not yet studied carefully before in acidic media, could be fully explained by the equation obtained. The rate equation reveals that : below pH 6.0 the reaction is initiated by hydronium ion to p-nitrocinnamaldehyde, at pH 7.0∼9.0 the reaction is initiated by water and hydronium ion competitively and at obove pH 10.0 the reaction is initiated by hydroxide ion to p-nitrocinnamaldehyde.

遷移金屬觸媒를 利用한 SO₃의 分解反應

崔成符,南錫泰 龍仁大學校 1991 용인대학교 논문집 Vol.7 No.-

연료로 사용할 수 있는 수소를 얻는 방법에는 여러가지가 있다. SO2와 I2를 사용하여 물을 열화학적으로 분해시키는 것(SO2- I2-Water System)도 수소를 얻는 한가지 방법이다. 이 Cycle은 H2SO4 분해 그리고 HI 분해의 두 단위 분해반응을 갖는다. 본 연구는 고온에서 황산의 촉매 분해에 관한 연구이다. 황산을 360℃에서 분해시켜 얻은 SO3를 Al2O3, ZnO 및 SnO2를 담체로 한 10wt %의 Fe2O3, CuO와 Cr2O3촉매가 담긴 반응기로 보내어 1기압, 450℃~850℃의 온도 범위에서 반응시켰다. SO3의 분해율은 700℃~750℃에서 급격히 증가 하였으며, Fe2O3- Al2O3 촉매가 다른 촉매들 보다 분해효과가 가장 좋았다. 실험결과 Fe2O3- Al2O3 촉매에 대한 활성화 에너지는 11.3kcal/mol ˚K, 빈도인자 값은 4.9×104hr-1이었으며 850℃에서 최고 분해율 62.5%를 얻었다. There are many methods to obtain hydrogen which can be used as a fuel. The thermochemical water splitting method using SO2 and I2, so called SO2-I2-water splitting cycle, is also one of the methods to get the hydrogen. This cycle includes two unit decomposition reactions such as H2SO4 decomposition and HI decomposition. This paper is a study on the high temperature catalytic decomposition of sulfuric acid. The SO3 generated by sulfuric acid decomposition at 360℃ is delivered and reacted in the reaction vessel which is packed with 10wt% Fe2O3, CuO, Cr2O3 catalyst to be supported on Al2O3, ZnO and SnO2 carrier in the temperauture range from 450℃ to 850℃ at 1 atm. The decomposition rate of sulfur trioxide increases from 700℃ ∼750℃ sharply. Fe2O3- Al2O3 catalyst has the best decomposition effect than other catalysts. As a result, the activation energy for Fe2O3- Al2O3 catalyst is obtained 11.3 Kcal /mol ˚K and the pre-exponential factor is obtained 4.9×104 hr-1. The maximum decomposition rate was 62.5% at 850℃.

정상인과 정신지체인의 치아우식증과 치아우식 원인균, 타액내 면역항체의 비교

최세원,양규호,최남기,강미선,임회순,오종석,김선미 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.3

정신지체학교 고등부 다운증학생의 직업흥미에 관한 연구

박남숙,최국환 국립특수교육원 2004 특수교육연구 Vol.11 No.2

본 연구는 서울특별시 소재 정신지제(단일장애) 특수학교 12개교 고등부에 재학하고 있는 남·여 다운증 학생 52명을 대상으로 이들의 일반 직업흥미영역을 살펴보고, 성별·학년별·사회연령별로 직업흥미영역을 비교·분석하기 위하여 실시되었다. 「KEPAD 그림직업흥미검사 Ⅰ(2003)」이 본 연구에 사용되었다. 연구결과, 다운증학생들은 7개의 직업흥미영역 중 세탁, 제조작업, 청소, 정리, 음식제공, 대인서비스, 농축화훼 영역 순으로 직업흥미도를 보였고, 남학생은 세탁 영역에서 여학생은 제조작업 영역에서 가장 선호도가 높게 나왔다. 그러나 학년 및 사회연령에 따른 직업흥미 선호도는 통계적으로 유의미한 차이가 없었다. 본 연구의 시사점과 제한점이 논의되었다. This study was performed to identify the vocational interest areas of high school students with Down Syndrome according to the variables of gender, grade and social age. A total of 52 high school students with Down Syndrome participated in this study, and the Pictorial Vocational Interest Test for the mentally retarded, developed by Korea Employment Promotion Agency for the Disabled(KEPAD, 2003), was used. The common vocational interest areas of students with Down Syndrome were as follows: Laundry Service, Manufacturing Industry, Cleaning Service, Arrangement Service, Eating Service, Personal Service, and Horticulture. There was a gender difference in this study in which the male students with Down Syndrome showed more strong vocational interests in the area of Laundry Service, and the female students with Down Syndrome showed more strong vocational interests in the area of Manufacturing Industry. There were no differences in the variables of students' grade and social age. Recommendations and limitations of the study were discussed.