水溶液에서 染料의 오존 酸化

曺秉樂,吳圭天,李培光 대구보건대학 1987 대구보건대학 論文集 Vol.10 No.-

This study provides the optimum condition for the removal of the dyes, Acid Red, Metanil Yellow and Methyl violet, in aqueous solution with ozone oxidation at semi-batch reactor. 1. The ozone oxidizing reaction of dyes, Acid Red and Metanil yellows acid solution, Methyl violet in alkali solution, obey good first order kinetics. 2. The degradation rate of the dyes are proportional to "ozone dose rate" R and C the concentration of each dye. so that the kinetics equation 7 is encounted. 3. The removal rate constant, k, of Acid Red was 0.042 min.^(-1), and that of Metanil Yellow and Methyl violet was 0.056 min.^(-1), 0.072min.^(-1), respectively.

Cement 粉碎效果에 Allyl alcohol이 미치는 影響

金昺圭 成均館大學校 1979 論文集 Vol.26 No.-

所要粉碎動力費를 節減하기 爲하여 有機溶媒를 粉碎助劑로 擇하고 液相接觸으로 그 粉碎效果를 向上시키는 硏究는 여러學者들에 進行되어왔다. 筆者는 이에 立脚하여 우리나라에서 動力費節減이 要求되는 Cement 製造를 對象으로 하고 손쉽게 얻을 수 있는 飽和一價 Alcohol類를 粉碎助劑로 擇하고 接觸確率을 增加시키기 爲하여 氣相接觸으로 飽和一價 Alcohol類 또는 有機溶媒를 粉碎助劑로 製品品質의 影響이 없고 粉碎效果가 좋은 100℃附近에서 Cement粉碎效果를 硏究하였다. 더욱 今番實驗에서는 工場에서 操作하는 比率을 擇하여 Cement Clinker에 2.5% 石膏를 添加한 後에 不飽和一價 Alcohol인 Allyl alcohol(b.p 97℃)을 粉碎助劑로 擇하여 相互 粉碎效果를 比較하고 原因으로 推定되고 吸着現象도 아울러 測定하여 그 粉碎效果와의 關係를 對照檢討하였다. 그結果 不飽和 一價 alcohol이 飽和一價 alcohol 中 가장 粉碎效果가 좋은 n-propyl alcohol보다 더 增加시켰고 또 粉碎效果增加는 吸着量과 比例됨을 認知하였다. 그러나 物性인 引張强度. 壓縮强度는 前者가 後者보다 減少되지만 그 減少率이 극히 少量인고로 構造物로의 許容 範圍內에서 使用可能함을 今番實驗結果로서 確信을 얻었다. Most expenses of production in cement industry are electric power, therefore many scientists had researched through various ways for saving power cost. Especially, they are an urgent problem, for Korea electric power cost so expensively. As one means of saving power, by crushing aid of organics(i.e. primary, secondary alcohol series, fat, or resins), it was atempted to prevent the growth of secondary particles on liquid contacting system. But it was not sufficient on heterogeneous dispersion system. In this experiment, the increasing of crushing effect was investigated in gaseous contacting system and 100℃ of not influencing upon cement products. Then, organic crusing aid were used Allylalcohol, in range of 0.1-0.5% (wt%) concentration. Thus, saving power and properties of structures depend on factory data. On standard of comparing data, continuous method in dry crushing was adopted to practical operation condition. Therefore, it must be analysed by batch mothod in possible application because it is better than continuous method. treated on computation of power should be done by crushing ratio, directly, but was tendency of specific surface mean diameter of particles according to hour limit. Also, the increment of crushing effect had been refered to the adsorption phenomena on cement particles by the vapor of organic solvent with crushing aid in the experiment of crushing. Then, the adsorption phenomena has researched by Gaschromatography method, because of it's convenience and accuracy. Organic solvent had been used as the adsorbate (i,e. allylalcohol) Through the experimental investigation, the following results were obtained: 1) Saving power were increased by the increase of temperature and amount of organic crushing aid. Also it was increased up to 26%, by the adsorption of Allyl alcohol vaper 0.5 wt. %. 2) The adsorptivity of unsaturated alcohol (allyl allyl alcohol) is more than saturated alcohol (n-propyl alcohol) 3) Adsorption phenomena of these organic solvents have the similar tendency to the Freundlich's adsorption isotherm equation. 4) After 6 hours of the crushing time when the difference of the crushing effect had taken place, the amount of adsorption has rapidly increased. But, before this time the amount of adsorption has not almost increased. 5) Crushing effect has been increased with the increment of amount of adsorption.

충진전해법에 의한 염색폐수 중의 총 질소 제거에 관하여

조병락,권기홍,최진균 영남이공대학 산업기술연구소 2003 産業技術硏究 Vol.15 No.-

A major pollutant, total nitrogen(T-N) in water quality mostly causes eutrophication and red-tide. A cotton/rayon-producing factory adopting a coagulation-activated sludge method is still producing a significant level of 400~1,500mg/1 T-N component in the secondary treatment effluent. In this work, a packed-electrolysis method was further teeted for the removal of T-N(216.3~285.1mg/1), which was residual, firstly treated by a decomposition-air stripping process from the secondary wastewater effluent. Experimental results showed that about 55~60% of T-N was removed in the conditions of 60min electrolysis, 25mm electrode distance, 25 A, together with C/Al electrode. T-N removal efficiency increased with increasing the amount of NaCl, where about 58% removal was achieved with the input of 6,000mg/1 NaCl. The range of pH 4-7 is generally good for electrolysis, but further increasing over pH 8 showed detrimental effects, and 70% removal of T-N was recorded with pH 5. The effects of packing materials revealed that activated carbon was proper for T-N, on the other hand, zeolite material was more effective for NH₃-N component. An activated carbon packed-electrolysis method is better than non-packed system in which the increase of ΔpH=1 and Δt=4.7℃ was noticed, and positive electrode packing type was better.

偏心攪拌에 있어서 Impeller類型에 따른 所要動力과 混合時間의 比較

金昺圭,朴永玉 成均館大學校 科學技術硏究所 1985 論文集 Vol.36 No.2

Though the off-centered mixing is now being widely used in mixing of the bulk liquid a few studies have been reported about the agitation power and mixing time, and the suitable number of baffle plates and vessel arrangement for the off-centered mixing with the various impeller types. It was repored by Shinji Nagata and Masabumi Nishikawa that both the baffle plates and off-centered distance greatly influenced the agitation power and mixing time only for the paddle type impellers. In this paper, the effects of the off-centered distance on the agitation power and mixing time are reviewed, and the effect of the baffle plates on off-centered mixing used for the variouse impeller type is also studied. In order to measure the agitation power and mixing time watt meter was used and the method of acid-alkali reaction was employed respectively. Three-types of impeller were used: a six-blades-turbine, a four-blades-paddle and a three- blades-propeller. The results are as follows: 1. For all types of impellers employed in this experiment, the increase in number of the baffle plates caused an increase agitation power and a decrease in mixing time. In addition, an increase in off-centered distance also caused an increase in agitation power and a decrease in mixing time. 2. Regardless of the baffle plate number and off-centered distance, the three-blades-propeller type impeller required a lower agitation power compared to other types of of impellers. However, the six-blades-turbine impeller required the highest agitation power with a relatively lower mixing time. 3. For all types of impellers employed in this experiment, the agitation power required for mixing with two baffle plates was almost the same as that with four plates of baffle. In addition, at the off-centered distance over a half of diameter of impellers, there existed little difference in the agitation power in spite of the number of the baffle plates. 4. For all types of impeller used in this experiment, the mixing time consumed with two baffle plates also was almost the same as that with four plates of baffle. Futher, the off-centered distance over a half of diameter of impellers did not affect mixing the off-time. For complete mixing, therefore, it is unnecessary to be equipped over two plates of baffle and centered distance of a half diameter of impeller. 5. When the values of the agitation power and mixing from the four-blades-paddle type impeller were compared to those of Nishikawa's, it was observed that the trend of the former was in accordance with that of the latter with regard to the agitation power and mixing time.

微生物膜 流動層反應器內 合成廢水의 脫窒化

金昺圭,金炳佑 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.2

This study has been done to investigate the effect of biofilm thickness and carbon source on the denitrification of synthetic wastewater in the fluidized bed biofilm reactors. Based on the data on growth and denitrification of Pseudomonas denitrificans (ATCC 13867) in the batch cultures containing different carbon sources, it has been found that methanol can be used as a good industrial carbon source in the reactors. Experiment was done mainly to examine several models in view of film thickness. Main conclusions of this study are as follows; 1) Methanol is effective as an industrial carbon source to reduce the overgrowth of biofilm on fluidized media, as the chief mechanism for nitrate removal is respiratory action rather than assimilation 2) In batch culture of methanol a suitable lag time is needed before denitrification, and an acclimation period is also required. Upon stabilization of the bacteria in fluidized bed, however, the denitrification is vigorous. 3) As biofilm thickness increases toward a steady state limit, the rate of substrate conversion becomes faster. If biofilm grows more than 150 micron, the bioparticles are floating and swept away. Therefore, effective thickness should be less than 150 micron, up to which the growth is supported by such C-source as yeast extract-peptone mixtures. 4) It has been found that the flow rate 7±2ml/sec is optimum in this system. While increase of flow rate causes the decrease of nitrate removal, the decrease of the rate results in the breakdown of fluidized system owing to plugging by N_2 & CO_2 gas. 5) The reactor performance parameter, K is 0.011 by applying the W.K. Shieh model to this system. 6) In order to reduce the high concentration of nitrate (2,000mg/l) discharged in nuclear fuel cycle to U.S.E.P.A. criterion (40mg/l less), it is recommended that such reactors as this system be connected in series, or a new reactor of large capacity be designed on the basis of the data and parameters obtained from this study.

인터넷 웹 기반의 초등학교 학급경영 홈페이지 자동화시스템 구현

황병기,최재원 경성대학교 2001 論文集 Vol.22 No.1

While the teaching method is affecting the whole of education through making the most of internet, the necessity of the teacher's home-page becomes influential. However, most of teachers are incapable in making their own home-page or can't even conceive the idea of running their home-page owing to the burden that they should invest much time beyond working hours. Therefore, it was to study on the realization of home-page automation system for the elementary school teachers on the basis of the internet web possible to make the class home-page with the input of a minimum information although a non-majors or the beginners, who are rarely capable to make the home-page. Under this circumstance, it has analyzed the requirements of the class home-page for the class management by the elementary school teacher and designed the standard model of the class home-page to realize the dynamic home-page possible to link to the school and home. Also, it has analyzed the requirements of home-page automation system on the basis of design of home-page proposed and then realized an automation system, using the JSP programming method. On the ground of the results from this system, it is able not only to construct the home-page by the elementary school teacher after this but to become the little basis of education information as making the most of educational supplementary means for the class management.

PLA/TPS 블렌드의 물성과 형태학에 관한 연구

정병욱,신창호,김영진,신부영 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1

본 연구에서는 polylactide(PLA)/thermoplastic starch(TPS) 블렌드를 3가지 공정으로 제조하여 블렌드의 물성과 형태학의 변화를 조사하였다. 본 목적을 위하여 PLA와 TPS를 이축압출기로 단순히 블렌드한 단순 블렌드, PLA를 TPS와 블렌드하기 전에 maleic anhydride와 개시세로 먼저 말레익화 시킨 maleated PLA (MPLA)를 TPS와 블렌드한 MPLP/TPS 블렌드와 PLA, TPS, MA 및 개시제를 동시에 브렌드하는 in-situ PLA/TPS 블렌드를 제조하였다. DSC로 측청한 유리전이온도(Tg)의 변화가 없는 것으로 보아 블렌드 공정에 따른 상용성의 변화는 없었다 인장강도와 탄성율은 TPS의 함량에는 의존하나 블렌딩 공정에는 영향이 없었다. 형태학의 변화는 블렌딩 공정에 따라 큰 변화를 보였다. In-situ PLA/TPS 블렌드의 경우 분산상의 크기가 고르고 분산이 잘되었으며 계면접착 또한 아주 좋았다. 이는 상분리는 일어나지만 기계적 상용성이 있음을 보여준다. To study the effect of blending process on the properties and morphology of PLA/TPS blends, simple PLA/TPS blend, maleated PLA/TPS blend, and in-situ PLA/TPS/MA/initiator blend were prepared. Glass transition temperature of PLA in blends was not changed by the blending process and the composition of TPS. This may be the lack of compatibility between PLA and TPS. Tensile strength and modulus of blends were depend on the composition of TPS whereas, blending process did not effect on the tensile properties. The morphology of blends was highly depends on the blending process. In situ blend showed a good dispersion of TPS in matrix and a good interfacial adhesion between TPS and PLA matrix. This may be mechanically compatible but phase-separated.

지역 농특산물과 소비자인식에 대한 상관성 분석 : 천안지역을 중심으로

함병은 동국대학교 사회과학연구원 2007 사회과학연구 Vol.14 No.1

본 논문은 천안지역 소비자를 중심으로 지역의 농특산물과 소비자들의 인식정도에 대한 상관관계를 분석하여 지역 농특산물의 소비를 촉진 시킬 수 있는 마케팅전략 방안을 제시하고 있다. 본 연구에서 분석한 결과를 바탕으로 특히 지역 친환경 농특산물 소비촉진을 위한 주요 마케팅 전략을 제시해 보면 품질강화, 신선도 유지, 집중적 홍보 및 판촉강화, 적정한 가격유지, 새로운 소비시장 개척으로 요약된다. 이러한 지역 농특산물의 마케팅전략을 추구함으로서 지역의 친환경농업은 물론 지역경제 활성화에 기여하게 될 것이다. In this study, the interrelationship of consumers' recognition regarding agricultural local products was observed. Therefore there are a little considration characters of satisfaction, purchase intention, fluctuation elements(price and quality), aborigines yes or no, and residential area between area consumers and agricultural local products, but there's a little or no interrelationship. Preferably it was analyzed that there's minus interrelationship with aborigines and residential area. So marketing to consumers, it is necessary to make national marketing strategy not centering area. And price policy is important , but it is desirable to execute in parallel the production and circulation policy which is considered qualities seriously. Also in case of Ch'onan area, there are agricultural specialities like the grapes of Geobong, the pear of Ch'onan and the walnut of Kwangduk. It is desirable to develop with national brand through supporting and rearing the specialities intensively.

有機物 液相 二成分 混合物에서 活性炭 吸着에 관한 硏究

金昺圭,朴炫度 成均館大學校 科學技術硏究所 1986 論文集 Vol.37 No.1

Theories and experimental data for adsorption equilibria in multicomponent solutions were investigated which were essential to study of separation process by adsorption on solid. Then, adsorption equilibria and characteristics of binary liquid mixtures on activated charcoal were studied in a batch system at 30℃ under standard atmosphere. The binary liquid mixtures were selected from two components out of ternary components such as benzene-toluene-n-hexane and benzene-toluene-cyclohexane systems. The results are as follows. (1) Relative adsorption selectivity in benzene-toluene-n-hexane system was in the order of benzene, toluene and n-hexane, and relative adsorption selectivity in benzene-toluene-cyclohexane system was in the order of benzene, toluene and holcycexane. (2) In each system of binary liquid mixture solutions surface excess is expressed as n_1^E = A + BX_1+ CX_1^2 + DX_1^3 + EX_1^4 + FX_1^5, and the surface excess coefficients are computed by means of computer calculation. (3) Experimental data were consistent with Everett model up to about 0.65 mole fraction in benzene toluene binary liquid mixtrures and up to about 0.70 mole fraction in benzene-n-hexane and benzenecyclohexane, but binary liquid mixtures of toluene-n-hexane and toluene-cyclohexan were not consistent with Everett model. (4) In benzene-toluene -n-hexane and benzene--toluene-cyclohexane systems, the experimental data of surface excess properties were well corresponded to thermodynamical calcuation. The activity coefficients calculated by Wilson's equation were corresponded to vapor-liquid equilibria data.

도시 고형폐기물의 지역별 쓰레기 성상 비교 : 서울 및 대구지역을 중심으로

曺秉樂,徐裕德,權起弘 영남이공대학 산업기술연구소 1995 産業技術硏究 Vol.8 No.-

This study was carried out to investigate the physico-chemical characteristics of municipal solid wastes generated in Seoul and Taegu area. Each waste sample was analyzed to obtain physical and chemical compositions. The average physical compositions of wastes in Seoul were garbage 54.7%, paper 18.1%, and plastics 12.1%, and those produced in Taegu were garbage 42.2%, paper 21.4%, and plastics 10.8%. The higher amount of papers and plastics is due to many office building. The annual generation rates of municipal solid wastes in Seoul and Taegu area were 1.16㎏/c.day and 1.04㎏/c.day. Bulk densities of municipal solid wastes made a difference at each sampling site and the average bulk densities of wastes produced in Seoul and Taegu area were 117㎏/㎥ and 114㎏/㎥, respectively. The average moisture contents of wastes from Seoul and Taegu area were 47.3% and 39.0%, and the volatile solids were 38.7% and 33.4%, respectively. The average low heating value of wastes from Seoul and Taegu area were 2,057kcal/㎏ and 1,877kcal/㎏.