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.

Poisson-Type 기동표적이 시스템 모델링 오류에 대한 추적 필터의 성능 해석

오상병,김상진,임상석 한국항행학회 2003 韓國航行學會論文誌 Vol.7 No.2

근래에 Poisson 형의 점프 프로세스를 이용하여 표적의 기동 운동을 모델링하고 이것을 이용한 반복형 최소분산 선형 필터가 제안되었다. 이 필터에서는 기동 표적의 모델링에 사용한 점프의 상태천이 파라미터가 미리부터 필터에 알려져 있다고 가정하였는데 실제는 이것을 모르는 경우가 많다. 본 논문에서는 이러한 기동 추적 과정에 수반되는 모델링 오류가 제안된 추적필터의 성능에 어떤 영향을 미치는지 고려한다. 정상적인 분석을 위해서 상태천이 파라미터를 실제와 다른 값을 사용하고, Monte-Carlo 시뮬레이션을 통해 필터의 성능을 해석한다. Recently Lim has proposed a linear, recursive, unbiased minimum variance filter for a maneuvering target based on the maneuver dynamics modeled as a jump process of Poisson-type. In the proposed filter it was assumed that the state transition parameters of the jump used for target maneuver modeling are a priori known to the filter. However, in most cases they are not known in practice. In this paper, we consider the influence of system (target) modeling error on the performance of the proposed tracking filter arising from the maneuver tracking. For qualitative analysis Monte-Carlo simulations are carried out against employing the maneuver model with different state transition parameters from the actual values.

磁性浦捉劑 δ-FeOOH의 製造와 이를 利用한 重金屬이온의 處理

오상오,박유철,구본권 慶北大學校 1980 論文集 Vol.30 No.-

자성포착제 δ-FeOOH는 황산철과 수산화나트륨 수용액을 반응시켜 얻은 수산화철 용액에 오존을 급격히 통하게 하여 합성했다. 실온에서 산화시간을 일정하게 하고 황산철에 대한 수산화나트륨의 농도 변화에 따른 δ-FeOOH의 생성에 대한 최적조건을 조사했다. 이러한 조건하에서 만든 산화철로써 폐수중의 중금속이온 즉 Cd^2+, Cr^6+, As^3+, Pb^2+, Hg^2+를 처리하고 그 결과를 보고한다. Magnetic seeding material, δ-FeOOH was prepared by passing through ozone to Fe(OH)_2, which is made by reaction the aqueous solution of the ferrous sulfate with the sodium hydroxide. In order to find the condition of formation of δ-FeOOH at room temperature, the variation of concentration of sodium hydroxide against ferrous sulfate was considered at constant oxidation time. Under these conditions, the degree of treatment for heavy metal ions, such as Cd^2+, Cr^6+, As^3+, Pb^2+, and Hg^2+ in waste water were discussed.

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.

욕창 환자에서 빈혈과 혈청 단백질의 변화

오상향,남기석,이상오,박상일,최은,이양균 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.1

Objective : To investigate the pathogenesis of anemia and serum protein alteration in patient with pressure ulcer and proper management method. Method : Eleven patients with pressure ulcer were investigated. To investigate the change of anemia and serum protein between pre- and post-treatment of pressure ulcer, we measured hemoglobin, hematocrit, serum iron, ferritin, transferrin, mean corpuscular volume(MCV), red cell count, serum albumin and globulin before and after healing of pressure ulcer. Result : There was significant increases of hemoglobin, hematocrit, red cell count, MCV, serum iron, ferrtin and transferrin after healing of pressure ulcer(p<0.05). The serum ablumin and A/G ratio were increased significantly(p<0.05). The total globulin and α1-globulin were decreased significantly(p<0.05). There was no statically significant relationship between the ulcer size and the degree of anemia and hypoalbuminemia. Conclusion : This research suggested that anemia and serum protein alteration in patient with pressure ulcer are thought result from chronic inflammatory process. So, anemia and alteration of protein does not require any treatment such as transfusion, iron and albumin supply.

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.

Molybdenum 錯物에 對한 硏究(Ⅲ)

吳相午 慶北大學校 1968 論文集 Vol.12 No.-

Molybdenum compounds have been prepared as new compound;M0O(CNS)3•2Py and M0O(OH)(CNS)3•2Py where Py= Pyridine. properties and configuration of the complexes were studied by the chemical and physical methods.

trans-Fluoroaquobis (ethylendiamine) Chromate(III) Cation 수화반응 속도에 대한 온도와 압력의 영향

吳相牛,李相協,林鍾完 慶北大學校 物理化學硏究所 1986 硏究論文集 Vol.7 No.-

착물 trans-〔Cr(en)_2F(H_2O)〕^2+의 hydrolysis에 대한 속도상수를 분광광도법으로 여러가지 온도와 압력에서 측정하였다. 온도 범위는 30℃에서 50℃까지이고 압력은 1 bar에서 1500bar까지 변화시켰다. 1bar, 30℃에서 측정된 속도상수는 2.632×10 exp(-5)sec^-1였다. 속도상수는 일정온도에서 압력이 증가함에 따라 감소하였다. 활성화 부피와 다른 활성화 파라미터들은 이러한 속도상수로 부터 계산되었다. 활성화 부피는 모두 양의값을 가졌으며 0.477에서 3.152㎤/mol내에 있고, 활성화 엔트로피는 작은 값을 가진다. 이 반응은 흡열반응이고, 실험적인 온도에서 엔탈피 지배반응이다. The rates of hydrolysis of the complex, trans-〔Cr(en)_2F(H_2O)〕2^-1, have been investigated using spectrophotometric method at various temperatures and pressure. Temperature was 30℃ to 50℃ and pressure was varied up to 1500bar. The rate constant measured at 30℃ is 2.632×10 exp(-5)sec^-1. The rate constants are decrease with increasing pressure at constants temperature. Activation volume and other activation parameters are calculated from these rate constants. The activation volumes are all positive and lie in the limited range 0.447∼3.152㎤/mol and the activation entropies are small values. From the results, it was found that this reaction was endothermic and enthalpy controlled reaction in the experimental temperature.

혼화재료로서 석분토의 재활용 가능성 평가

이상욱,김성원,오상균,김정길,마상준 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Stone-Dust are inevitable by-products of almost rocky mountains which produce artificial sands in korea. The annual amounts of Stone-Dust is over 80,000㎥ approximately. Almost pre-existing Stone-Dust piled up out in the open space on disposed of industrial waste, it can result in critical environmental problem. The aim of this study is to promote the recycling of industrial waste as a kind of material of admixture. This study conducted some experiments such as pozzolan reaction test and flow test, compressive strength of mortar using Stone-Dust in heat-treatment. As a result of, compressive strength of mortar using stone-dust in heat-treatment is superior in the case of 700℃ 90min.

의문사구의 이동과 그 흔적의 자질점검

이상오 대한언어학회 1994 언어학 Vol.2 No.-

Lee, Sang-oh(1995), The Movement and Feature-Checking of Wh-phrases. Linguistics, vol. 2. The purpose of this paper is to examine how the Case theory under the Minimalist Program tells about the traces left by the movement of wh-phrases and how it checks the features of them with the suggestion that PRO should be checked its Null Case.' The licensing way of wh-traces in wh-constructions is discussed in terms of chain referring to the effects of Subjacency and the Empty Category Principle(ECP).