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구리이온을 도입한 Acrylonitrile-Acrylic Acid계 공중합체의 도전성에 관한 연구
손원근,맹기석,김동철,송해영 忠南大學校 産業技術硏究所 1987 산업기술연구논문집 Vol.2 No.2
The AN-AA copolymer-Cu(Ⅱ) and Amidated AN-AA copolymer-Cu(Ⅱ) complex were the most stable in the pH range of 9. The morphology of Cu(Ⅱ) complex and CuxS-induced had changed into compact form. The thermal stability for Cu(Ⅱ) complex and CuxS-induced had been determined through DTA and TGA measurement. As result, it has been observed that thermal stability for Cu(Ⅱ) complex were stabilized less than that of copolymer. The Cu(Ⅱ) complex exhibited surface resistivity around 10Ω㎝ when modified iodine in acetone. The resistivity was significantly affected by the amounts of added cupric chloride, iodine and results were statisfactorily obtained by adding more than 20wt% of Cupric chloride and about 1.0wt% iodine. The optimum condition for the introducing of CuxS was at the CuSO₄concentration of 30g/ℓ and the reaction time of 3hrs. The CuxS-induced electrical conductivity of copolymer was higher by order of 10 than that of the Cu(Ⅱ) complex.
폴리비닐 슬폰산-디비닐벤젠의 합성과 이온교환성질에 관한 연구
서구원,윤종태,맹기석 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1
Radical copolymerization of the complexed vinylacetate-divinyl benzene initiated by azobisisobutyronitrile was carried out in toluene at 98℃ for 7hours. Polyvinylalcohol-divinylbenzene resin was prepared by transesterificating vinylacetate-divinylbenzene copolymer with a 1% methanolic sodium hydroxide solution. Sulfonated polyvinylalcohol-divinylbenzene(SPALDVB) was prepared by sulfonating vinylalcohol-divinylbenzene resin with conc-sulfuric acid. The composition of each synthetic resin were identified by means of infrared adsorption spectroscopy. 1) SPVALDVB possess exchange capacity of 7.8 meq/g. 2) Adsorption of SPVALDVB were increased when pH is increased. 3) The determination of the distribution coefficient was carried out in 0.1-1.0 N hydrochloric acid solution containing 20-90% of the ethanol, ethylene-glycol. Increasing hydrochloric acid concentration, Kd is decreased. 4) The separation of Co(Ⅱ), Ni(Ⅱ), Cd(Ⅱ)ion is possible in 40% ethanol with 0.5N hydrochloric acid mixture.
김맹기,이학영,김종원 한국환경과학회 1993 한국환경과학회지 Vol.2 No.1
This study was carried out to find the relationships between species pairs in the vegetation of eastern valley vegetation in Mt. KumJung from September 20, 1991 to October 15, 1992. Eight sites were selected, each being divided into 5 quadrats, and thus 40 quadrats were in total. To know the correlation among plant species the x^2 values were calculated by using the method of Yates, and the results were analyzed by cluster analysis according to Sneath and Sokal, and the following conclusions were obtained. The species examined can be subdivided into five groups according to the relationships. However, the relationships are not correlated with pH, water-content, maximum water holding capacity and mineral content of soil probably due to the environmental discontinuity.
工業敎育大學 工業化學敎育科의 敎科課程 改善에 관한 硏究
송해영,홍원표,맹기석,윤석호,노재성,강용 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)
The methods for the improvements of curriculum of the Department of Industrial Chemistry Education were examined in some detail discussing the following items; 1) Comparison and analysis of the new curriculum with the old of the Department of Chemical Industry in technical high school. 2) Examination of the current curriculum of the Department of Industrial Chemistry Education in Industrial Education College. 3) Suggestion of the improved curriculum suitable for the students in the Department of Industrial Chemistry Education.
宋周鎬,李昌岬,洪元杓,孟琦錫,任洪彬,李廷玟,李載元,李來烈,權五憲,金振淳,李文洙 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.1
This paper aims at providing a concrete plan to improve technical and vocational teacher education in the College of Industrial Education of Chungnam National University. It is intended to propose a practical four-year regular and short-term course. Also, the estimated required facilities is included in this study as well as their management. The main conclusions and recommendations are summarized as follows; 1) The numbers of students enrollment should be reduced to 220 students which is the approximate number of future demand. 2) In order to offer to the students a broader education and to cope with the increase/decrease in demand of technical and vocational teacher within a specific field, the 8 department existing at the present (Department of Architecture Engineering Education, Civil Eng. Educ., Metallurgical Eng. Educ., Mechanical Eng. .Educ., Electrical Eng. Educ., Electronic Eng. Educ., Industrial Chemistry Educ. and Industrial Technology Educ.) would be combined into 5 (Department of Construction Engineering Education, Mechanical Eng. Educ., Electrical Eng. Educ., Industrial Chemistry Educ. and Industrial Technology Educ.). 3) The short-term course program is recommened to provide additional training and education to those candidates who already have experience in technical fields to meet an occasional demand. 4) It is necessary to add the Teaching Profession Section in the administrative organization of the College.
An Analysis of Direct Inflow at Agricultural Reservoir during Flood Season
Ki Won Lee,Hyun Seok Lee,Hyung Jin Shin,Seung Jin Maeng 위기관리 이론과 실천 2019 Crisisonomy Vol.15 No.12
본 연구에서는 버들 농업용 저수지를 대상으로 직접유출량을 조사하였다. 강우량과 증발량은 저수지와 가장 가까운 화성시 양감면사무소에 위치한 기상관측소 자료를 사용하였다. 한편, 강우자료와 저수지내 용적량이 포함하고 있는 상대적으로 작은 관측 오차들은 무시하고 저수지 유역에 형성된 4개의 하천 중 유입량 조사가 가능한 2개 하천의 유량과 면적비를 이용하여 유입량을 산정하였다. 유역면적의 71%를 차지하는 2개 하천을 반시계 방향 순으로 Stream-①과 Stream-②로 구분하였다. 표면유속은 비접촉식 레이다유속계로 관측하였다. Stream-①의 표면유속은 3점유속법으로 구한 평균유속환산계수인 0.65로 보정하고, Stream-②의 평균유속은 평균유속환산계수인0.325로 보정하였다. 저수지로 유입 된 직접유출량은 2개 하천을 포함하고 있는 수계에 내린 강우량 대비 18.5 %임이 확인되었다. 한편 2개의 하천을 통한 유입량은 강우량 대비 22.6 %로 조사되었다. 많은 가정이 포함되어 있지만, 직접유출량은 면적비를 고려한 유입량에 비해 122.5 % 차이를 보였다. 유입량과 직접유출량의 차이에는 많은 원인이 있겠으나, 표면유속을 평균유속으로 환산하는 계수의 신뢰도 부족이 가장 큰 원인 중 하나라는 사실을 확인하였다. In this study, runoff was investigated in Beodeul agricultural reservoir during flood season. The precipitation and evaporation data collected from Yanggam weather station were utilized, while the inflow was estimated based on discharge and area ratio of the two investigatable streams in the reservoir basin. The two streams, whose catchment area was 71% of total basin, were categorized into stream-① and stream-② according to inflow direction. Surface velocity was measured by a non-contact radar current meter. The surface velocity of the stream-① was corrected by 0.65 as an average velocity conversion coefficient obtained by the three-point velocity method, whereas the surface velocity of the stream-② was corrected by 0.325 as a correction factor. The rate of direct runoff to the reservoir was estimated at 18.5% of the rainfall in the catchment areas of the two streams, and the inflow ratio through the two streams was 22.6%. Despite many assumptions behind these estimates, the inflow rate considering the area ratio was found overestimated by 22.5%. One of the main reasons of the difference between inflow and direct runoff was found to be a low reliability of the surface velocity correction factor .
孟琦錫,洪元杓 忠南大學校 1974 論文集 Vol.13 No.1
We have made an experiment on the physical properties such as the lmpact strength; weathering test, changes of weight, permeability and tensile strength of the commercial polyvinyl chloride film and the heat shrinkable p. v. c film-immersed in various kinds of chemical reagents. And the experiment appeared as below : (1) The change of weight is proportioned in accordonce with the change of concentration and temperature of inorganic acids, alkali and orgainc solvents, (2) The p.v.c. film immersed in the solution of flowing state is bigger in the change of weight than in that of resting state. (3) The heat shrinkable p.v.c. film and the heat shrunken p.v.c. film are less than original p.v.c. film in the change of weight and permeability. (4) In genera, p.v.c film immersed in various chemical reagents is lower in tensile strength than original p.v.c. film. (5) It is posible that the additives in p.v.c. films were measured using I.R.spectrum of p.v.c. films treated with organic solvents. The structures of p.v.c. film immersed in chemical reagents, which were com pared with those of the orginal p.v.c. film, were assigned to being determined by Infrared spectrum and we discussed on carbonyl group of additives from p.v.c. film immersed in chemical reagents.