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이대철,최학주 한밭대학교 건설안전기술연구소 2001 건설안전기술논문집 Vol.1 No.-
Most of korea rivers have a wide flood plain land that is useful area in the urban area. This study was conducted about using a high level bern which is useful to green area and is able to plant a tree at the Yudung stream in the urban passing at the Daejeon City. Input data to analyze is hydrological data of Yudung stream basin and meteorological data. In the end, flood flow stability of base bank and planting freeboard height of standard cross section is same follow. Using the HEC-RAS program. The drop based on project flood level after the planting at 400 which is placed the cross section pints were 0.82m. In this time, The drop due to bank height after the planting is showed 0.99m. Standard of project flood level and minimum freeboard height based on "Ministry of Construction and Transportation" or "River Institute Guide" was specified higher 1.0m. In that case, planting is unaccepted at the points. But when the cross section points are placed in other points. High level bern will is considered as the planting for a useful green area.
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李大喆 전북대학교 공업기술연구소 1985 工學硏究 Vol.16 No.-
In the manufacturing process for obtaining reduced iron from pickling-oxide with the charged carbon, the production of reduced iron in controlled by the prereduction process of the charged carbon-oxide pellet by carbon. consequently, for the increase of this product, the basic knowledge of the reduction mechanism packed pellet has to be reviewed. In this paper, time dependences of fractional reduction for a pellet at 800℃-1,100℃ were measured for charged carbon-oxide pellet with 2.25%, 4.5% charged carbon and added reducing agent BaCO_3(1-55), using reducing agent carbon. Fraction reduction is measured for ratio outer diameter of unreacted part and that of reduced iron.
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李大喆,李圭澤 전북대학교 공업기술연구소 1977 工學硏究 Vol.7 No.-
In the process for obtained reduced iron from iron-ore pellet, production of reduced iron is controlled by reduction process of hydrogen gas. Consequently, for the increase of this product, fundamental knowledge of reduction percentage by hydrogen has has to be reviewed. In this paper, time temperature, volume of hydrogen and various particle size dependances of reduction percentage for a iron oxide pellets were measured. Then, results were calculated by applying oxygen lost in the pellets. The results obtained are as follows. 1. particle size in the pellet : 65 100mesh 2. suitable reduction temperature ; 750℃ 3. Reduction time ; proportional 4. volume of reducing gas ; proportional
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黃酸암노늄-黃酸法에 의한 Bentonite系 粘土에서 아루미나 抽出
李大喆 全北大學校 1974 論文集 Vol.16 No.-
This report, evaluating ammonium sulphate-sulphuric acid process, is the third of a series evaluating process for the production of alumina. The first report describes extraction of alumina from domestic alunite by sulphuric acid and caustic soda process, the second describes extraction of alumina from clay mineral by isoprophyl ether process. This test makes possible the sulphate treatment of alumina-bearing minerals. In this process, ground bentonite clay is mixed with ammonium sulphate to suitable molecular ratio. The charge is roasted in an electric muffle furnace and leached with dilute sulphuric acid solution at proper temperature. The leached solution is filtrated to remove the silica mud. In montmorillonite-bentonite sample used, the proper resulting variants treated by the ammonium sulphate-sulphuric acid process were as followed. 1) sample grade : from-48 to-100 mesh 2) molecular ratio of flux : 1:6 3) roasting condition : 45min. at 600℃ 4) extraction condition : 30min. at 60℃ of 3%H_2SO_4 50ml.
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李大澈 大田工業專門大學 1983 論文集 Vol.32 No.-
With the tendency of the expe31sion of DAE JEON city and the in creasing of population in this city and to live as the cultural cifizen fine - environment of this city and to ruralize and now being flowing in the dirty state, the Gab cheon , to make it fresh water there fore using the drinking water at the drainage basin naturally , to use it in case and to inherit the clear water to our descendents we concluded that we should set up the basic plan of sythesis development of river which we have to investigate and to analyse and to arrange to be ideal and unique as the first wark for these things .
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流路 彎曲部의 曲率半徑에 따른 흐름特性과 河床變化(Ⅱ) 實驗 및 適用
李大撤,이종석 大田産業大學校 1995 한밭대학교 논문집 Vol.12 No.0201
李 等이 誘導한 關係式으로부터 구한 K1과 K2를 사용하여 豫測한 값과 移動河床을 갖는 單彎曲 實驗水路를 통해 實測한 값과의 比較結果는 만곡시점 부근에서는 좋은 결과를 보였으나 중앙 부근과 종점 부근에서는 다소의 오차를 보였다. 또한 수로중심선의 曲率 半徑이 각각 陽과 陰 1개인 複鷺曲 現場水路에서의 실측된 흐름특성과 河床變化의 비교 결과는 대체로 좋은 결과를 나타냈으며, 他 模型(Johannesson과 Parker)과의 비교에서도 양호한 결과를 나타내었다. 그러므로, 河川의 대부분인 彎曲水路에서 본 모형을 이용하여 흐름특성과 하상의 변화를 예측할 수 있을 것이며, 또한 水工構造物과 수로의 設計 및 河道의 改補修時에 有用한 情報를 提供할 수 있을 것으로 思料된다 The comparison of predicted results using K1 and K2 with derived from a companion paper (Lee et al.) measured ones in the movable single-bend experiment channel had a good agreement at the starting point of the channel, but had a little errors at the middle or end point of it. Also, the comparison of predicted results with measured flow characteristics and bedform changes in a multi-bend field chanrlel, with the curvature radius of centerline have the sign of positive and negative, respectively and a small channel showed good agreement. The comparison with other model (Johannesson and Parker) showed same good results, too. Therefore, this model will be used to forecast the flow characteristics and bedform changes in natural meandering channels, and also be able to give the useful information for the design, maintenance of hydraulic structures and channel alignments in meandering channels.
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