암민코발트(Ⅲ) 착이온의 수소이온해리반응에 미치는 온도의 영향

오상오,박유철,이동철 慶北大學校 物理化學硏究所 1984 硏究論文集 Vol.5 No.-

The acid ionization constants of cis-aquo-bis(ethylenediamine)cobalt(Ⅲ) complexes have been spectrophotometrically (at 500 nm) measured in aqueous solution. According to curve fitting method, the equilibrium constants of reaction(1) and (2), K_1 and K_2 were measured at a various tempratures from analyzing the extinction coefficients of Co(Ⅲ) complex ions in a wide range of pH. 〔Co(en)_2(H_2O)_2〕^3+ ⇔ 〔Co(en)_2(OH)(H_2O)〕^2+ + H^+ (1) 〔Co(en)_2(OH)(H_2O)〕^2+ ⇔ 〔Co(en)_2(OH)_2〕^+ + H^+ (2) K_1 and K_2 values increased with increasing the temperature, were 1.5×10 exp(-6) and 1.5×10 exp(-10) respectively at 30℃ in 1M sodium nitrate solution :ΔH_1=7.5㎉/mole, ΔH_2=6.5㎉/mole and, ΔS_1=-2e.u., ΔS_2=-23.6 e.u. The enthalphy and entropy changes indicate that the acid-base equilibria of Co(Ⅲ) ions are endothermic process and the effect of solvation is controlled over the reactions.

암민코발트(Ⅲ) 착이온의 수소이온해리반응에 미치는 온도의 영향

오상오,박유철,이동철 慶北大學校 1982 論文集 Vol.33 No.-

The acid ionization constants of cis-aquo-bis(ethylenediamine)cobalt(Ⅲ) complexes have been spectrophotometerically (at 500 nm) measured in aqueous solution. According to curve fitting method, the equilibrium constants of reaction(1) and (2), K_1 and K_2 were measured at a various tempratures from analyzing the extinction coefficients of Co(Ⅲ) complex ions in a wide range of pH. 〔Co(en)_2(H_2O)_2〕^3+??〔Co(en)_2(OH)(H_2O)〕^2++H^+ (1) 〔Co(en)_2(OH)(H_2O)〕^2+??〔Co(en)_2(OH)_2〕^++H^+ (2) K_1 and K_2 values increased with increasing the temprature, were 1.5×10 exp (-6) and 1.5×10 exp (-10) respectively at 30℃ in 1M sodium nitrate solution : ΔH_1=7.5Kcal/mole, ΔH_2=6.5Kcal/mole and, ΔS_1=-2e.u., ΔS_2=23.6 e.u. The enthalphy and entropy changes indicate that the acid-base equilibria of Co(Ⅲ) ions are endothermic process and the effect of solvation is controlled over the reactions.

회분식 반응기에서의 공정변수 변화에 의한 침강성 탄산칼슘 제조

신보철,한상오,김주호,송지훈,송근호,이광래 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

For the preparation of calcium carbonate particles from aqueous Ca(OH)2 slurry, carbonation reaction of aqueous Ca(OH)2 slurry was carried out by batch method the CO2 into reactor filled with aqueous slurry of Ca(OH)2. The concentration of Ca(OH)2 varies from 1.00 to 7.00wt%, reactor temperature at 20 and 40℃, and reactor pressure from atmospheric pressure to 6.0kgf/cm2. Crystal structure of calcium carbonate was of calcite, the particle size were about 0.05 ∼2.0㎛, and the particle shape was cubic and spindle. When reactor temperature was higher, particle size of calcium carbonate was bigger and particle share was varied, but reaction rate was increased. When reactor pressure was higher, particle size of calcium carbonate was smaller, particle shape was cubic, and reaction ramie was increased.

분사법에 의한 탄산칼슘 제조

신보철,한상오,김주호,송지훈,송근호,이광래 강원대학교 석재복합신소재제품연구센터 2001 석재연 논문집 Vol.6 No.-

본 연구는 탄산가스화법에 의한 탄산칼슘 입자 제조 공정에 있어서, 탄산가스로 채워진 반응기에 수산화칼슘 슬러리를 분사하는 방법으로 탄산칼슘 입자를 제조하였다. 수산화 칼슘의 농도(0.25~1.0wt%), 분사압력(0.5kgf /㎠~1.5kgf /㎠) 및 반응기 온도(20℃, 28℃)의 변화에 따른 생성된 탄산칼슘을 관찰하였다. 수산화 칼슘의 농도가 비교적 높으면(0.75wt%, 1.0wt%), 생성물의 pH와 전도도는 높게 나타났다. 분사압력에 의한 탄산칼슘 제조의 변화는 분사압력이 높아질수록(1.5kgf /㎠), pH와 전도도는 높게 측정되었다. 그러나, 수산화 칼슘의 농도와 분사압력의 변화가 탄산칼슘의 입자크기, 형태, 결정구조에 영향을 미치지는 않았다. 반응기의 온도가 28℃에서 생성된 탄산칼슘은 1.0㎛이하의 칼사이트 상 입자가 제조되었으며, 20℃에서 생성된 탄산칼슘은 0.5㎛이하의 칼사이트 상 입자가 제조되었다. 반응기의 온도가 낮아질수록 탄산칼슘 입자의 크기가 작아짐을 알 수 있었다. For the preparation of calcium carbonate particles from aqueous Ca(OH)2 slurry, carbonation reaction of aqueous Ca(OH)2 slurry was carried out by spouting the aqueous slurry of Ca(OH)2 into reactor filled with CO2 gas. The concentration of Ca(OH)2 varies from 0.25wt% to 1.0wt%, nozzle pressure from 0.5kgf /㎠ to 1.5kgf /㎠, and reactor temperature were set at 20℃ and 28℃. With relatively high concentration of 0.75wt% and 1.0wt% of Ca(OH)2, pH and conductivity of product-stream were observed high value. High pH and conductivity were observed at high nozzle pressure of 1.5kgf /㎠. The concentration of Ca(OH)2 and nozzle pressure, however, did not change the particle size and shape of calcium carbonate synthesized by carbonation reaction. The reaction temperature affected particle size. At reactor temperatures of 28℃ and 20℃, the particle sizes were about 1.0㎛ and 0.5㎛, respectively. Crystal structure of calcium calcium carbonate was of calcite. When reactor temperature was lower, the size of calcium carbonate particle was smaller.

원주 TIG 용접에서 이면비드 추정에 관한연구

오성원,장희석 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-

Recently TIG(Tungsten Inert Gas) welding of pipe is widely used in many industrial fields. Especially. TIG welded LNG pipelines are being rapidly spread since LNG is recommended as a "clean" energy source. But it is difficult to guarantee good weld quality due to unfavorable working condition on the welding sites. Furthermore, labor cost for qualified welder is getting higher and higher. Therefore, automatic orbital TIG welding system would be good alternative. The change of surface temperature near molten pool proved to have significient effect on the back bead size. in this study, the back bead shape is estimated by ANN(Artificial Neural Net), and sampled welding process variables including surface temperature are fed into the trained neural networks to generate height and width of the back bead. The estimated back bead size shows good agreement with the actual size.

이익지속성이 이익반응계수에 미치는 영향

오세도,홍성학 충남대학교 경영경제연구소 2000 경영경제연구 Vol.23 No.2

본 연구는 회계정보와 주가사이의 관계를 연구하는 실증적 연구에서 회계정보가 자본시장에서 유용하다는 관점에 중점을 두어 연구를 시작하였다. 기업의 연구개발비는 신기술과 신제품의 개발에 영향을 주어 기업의 초과가치를 향상시킬수 있고, 또한 광고선정비도 기업의 초과가차에 영향을 줄것으로 가정하여 이들 변수들간의 상관관계를 검증하였다. 기업의 상대적초과가치는 자보시장에 정보효과를 주어 누적초과수익률과는 임의 관계가 있을 것으로 가정하고 이 두변수간의 상관관계를 분석하였다 주기검증기간을 결정하기 위해 감사보고서일을 기준으로 하여 일별초과수익률을 구하고 변수와 가장 유의성이 높은 기간을 대상으로 하였으며, 상대적초과가치비율과 감사보고서일을 기준으로 한 일별초과수익률·누적초과수익률과의 관계를 회귀분석방법으로 실증분석하였다. 실증분석시 이익지속성 변수로 상대적초과가치비율을 이용하여 분석하였다. 실증분석 결과는 연구개발비는 상대적초과가치비율에 유의적인 양(+)의 상관관계를 보여주나 광고선전비는 상대적초과가치와 음(-)의 상관관계를 나타내며 유의적이지도 않았다. 초과수익률 산정시 감사보고서일을 기준으로 유의성이 높은 +2일에서 +23일을 검증기간으로 하였고, 이 검증기간의 상대적초과가치비율과 누적초과수익률에서는 지속적으로 음(-)의 상관관계를 보이고 있는데 이는 IMF로 인한 주가하락에 기안한 결과로 본다. 본 연구의 결과는 이익공시일의 결정에 있어서 감사보고서일의 전 후 유의성을 검증하여 회계정보의 누출여부를 검증하였고, 이들 회계정보가 이를 필요로 하는 정보이용자에게 유용한 정보가 될 것으로 본다.

사과'후지' 生理障害果에 있어서 果汁內 이온 濃度와 과실조직의 無機含量과의 관계

吳成都,崔東根 全北大學校 1994 論文集 Vol.37 No.-

Relationship between ion concentrations in fruit Juice and total contents of nitrogen, potassium and calcium in the fruit tissue was investigated in the physiological disordered apples in order to know whether juice ion measurement can be used to estimate the cause of physiological disordered Fuji apples (Malus domestics Borkh.). Juice ion concentrations were analyzed of pH/ion meter. Significant relationship between nitrate ion concentration of juice and total nitrogen was existed, while correlation coefficient was lower than that of normal fruits. There was no relationship between potassium and calcium. Total contents of N, K and Ca were lower in physiological disordered fruits than in normal fruits. Consequently, total contents of N, K and Ca in the fruit tissue can not be estimated by measuring ion concentrations in fruit juice of physiological disordered apples.

南北朝道敎의 민중적 전개 : 南北朝시기 道·佛 교류의 一端

吳相勳 부산대사학회 1988 역사와 세계 Vol.- No.12

運轉者 意識分析에 의한 都心地域의 不法駐車對策에 관한 硏究 : 釜山市 西面地域을 中心으로 in Seo-Myeon Area of Pusan

吳錫氣,高祥善 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.1

Nowadays, most of cities in Korea are faced with illegal parking problem, however, it is difficult to find out efficient countermeasures. In order to solve this problem, driver's opinions about illegal parking has to be taken into consideration. In this study, a questionnare for drivers in illegal parking in Seo-Myeon area of Pusan was carried out to know the reasons of illegal parking and so on, and was analyzed by the quantification Ⅱ. The summarization of the result in this study is as follows : 1) It was possible to analyze drivers' opinions about illegal parking. 2) Existence of drivers' opinions about illegal parking problem was related to kinds of vehicles and parking purposes. 3) It was necessary to be established and enforced comprehensive illegal parking management.

차의 생리활성

오상룡 中央大學校 食糧資源硏究所 1992 食糧資源硏究所 論文集 Vol.4 No.1