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.

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.

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.

인터넷 광고의 활성화 방안

오성동,류주식 朝鮮大學校 2002 經營經濟硏究 = Management and economics research Vol.25 No.1

벗나무속 수종간의 핵 리보솜 DNA의 ITS Ⅰ 염기서열 비교

오유성,김기옥,정용환,오문유,한상현,고미희 제주대학교 생명과학연구소 1998 제주생명과학연구 Vol.1 No.-

Comparison of four species (Prunus yedoensis, P. sargentii, P. pendula for. ascendens, P. serrulata var. quelpaertensis) and one cultivar of P. yedoensis were carried out by comparing their nucleotide sequences from the internal transcribed spacers (ITS) I of nuclear ribosomal DNA (rDNA). The length of the ITS I region was ranged from 229 to 236 base pairs (bp). The G+C contents of ITS I ranged from 58.5 to 60.2%. The value of nucleotide divergence across for four Prunus species and one cultivar ranged from 0.4 to 6%. The pairwise distance between P. pendula for. ascendens and P. yedoensis was 0.004 showing the lowest value among any other pairs. On the other hand, the pairwise distance betwen P. yedoensis and cultivated P. yedoensis was 0.026. The nucleotide analysis based on ITS I sequence was considerably similar to previous studies on the basis of random amplified polymorphic DNA (RAPD).

소아의 하악과두 골절 치료의 예후에 관한 장기추적조사연구

오승환 大韓顎顔面成形再建外科學會 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.6

This study is to evaluate and compare the long-term functional and gnathological results between conservative and surgical treatment methods of the pediatric condyle fracture patients, and finally to find out that, which is most important and predictable factors in the constructing the treatment plan for the pediatric condylar fracture. In the period from 1985 to 1998, total 30 pediatric condylar fracture patients and 37 joints below 15 years old were follow up examined to the period of 13 years(mean 5.2 yrs) For the analysis of functional and gnathological disturbance after treatments, the FDI(Functional Disturbance Index) and GDI(Growth Disturbance Index) of patients were established and analyzed according to the ages, treatment methods, and types of fracture displacements. The functional and growth disturbances of patients were very little or ignorable in general when they are treated with conservative methods, but in early teens and late children, the development of disturbances were slightly increased even after conservative treatments. And there were distinct increase of it when fracture was developed in the condyle head surface or the fracture fragments was severely dislocated regardless of treatment methods. Additionally, in the surgical patients, mild functional and growth disturbances were developed at any ages and at any types of fracture displacements. The severity of injury around the condyle head and condyle surface is(traumatically or surgically) more important in determining the prognosis of conservative treatment of pediatric condyle fracture patients and the surgical treatmenr should not be operated if possible in pediatric patients.

제주해역의 미기록 집게류 4종

오상철 濟州敎育大學 科學敎育硏究所 1997 科學敎育硏究誌 Vol.13 No.-

제주산 집게류에 관한 연구는 Yokoya(1933), Kamita(1954), 金(1958, 1960, 1963, 1964, 1970, 1972, 1973, 1974, 1977, 1978, 1985,), 吳(1981, 1983, 1990, 1993, 1994, 1995), 金, 吳, 金, 金, 이(1994) 등에 의해서 9과 16속 37종이 기재되고 있는데 제주시 소재 오라초등학교에 근무하는 高錫文(1995)교사가 1994년 3월부터 1995년 6월까지 제주도 연안의 22개 潮間帶와 眞沿岸帶에서 채집한 집게류 3,000여 개채중에 100여 개체를 동정한결과 제주해역에서 처음으로 발견되는 Diagenes edwardsii, 넓적왼손집게. D. nitidimonus, 긴왼손집게, Pagurus middendorffi, 긴다리참집게. Porcellana, 매끈이게붙이 4종이 지역적 ?? 확인되어 이를 제주만 목록에 추가 기록 하였다. It has been reported that there are 9 families, 16 genera 37 species of Hermit crabs in Cheju Island. Ko, Suk-Moon has collected about 3.000 Hermit crabs and identified 100 of them. As a result, 4 new specimens, Diogenes edwardsii, D. nitidimanus, Pagurus middendorffi, Porcellana pulchra, were discovered in the sea surrounding Cheju island, and have been added to the list of Hermit crab species in Cheju island.

Ⅲ급 부정교합의 치료후 예후에 관한 후향적 고찰

성재현,권오원,김상두 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.2

본 연구는 치료후 빈번한 재발로 인해 치료에 어려움을 겪는 Ⅲ급 부정교합의 치료후 예후를 예측하는데 도움을 주고자, 교정치료후 관찰기간동안 측모와 교합이 양호한 상태로 유지된 안정군(Stable group, n=12)과 그렇지 않고 재발의 경향을 보인 재발군(Relapse group, n=13)으로 나누고 초진시 계측항목을 이용한 t-test, 상관분석 그리고 판별분석을 시행한 결과 다음과 같은 결론을 얻었다. 1. 상하악골의 전후방적인 위치와 관계를 나타내는 항목인 SNA, SNB, ANB, Angle of convexity 그리고 APDI에서 두 군간 통계학적으로 유의성 있는 차이를 보여주지 않아 (p<0.05) 두군간 전후방적인 골결형태에 있어서는 차이가 나지 않음을 알 수 있었다. 2. 교합평면의 경사도와 관련된 항목인 Wits, AB to Occlusas plane angle 그리고 Occlusal plane to Mandihular plane angle에서 두 군간 통계학적으로 유의성있는 차이를 보여 (P>0.05)재발군의 교합평면이 안정군에 비해 전하방으로 많이 경사져 있음을 알 수 있었다. 3. 상하치열관계를 나타내는 항목인 Overjet에서 안정군이 재발군에 비해 절대치로 더 커(P<0.01) 전후방 골격부조화에 의한 것이 아닐 경우 치열의 전후방부조화가 클수록 치료후 예후가 좋음을 알 수 있었다. 4. 상관분석결과 Overjet과 Occlusal plane to Mandibular plane angle만이 통계학적으로 유의성있는 상관관계를 보여주었다(P<0.001, P<0.01). 5. 판별에 기여도가 높은 3항목 즉 Overjet, AB to Occlusas plane angle 그리고 Articular angle을 이용한 판별식을 도출하였으며, 이를 이용할때 본 연구에 사용한 표본의 88%를 올바르게 판별할 수 있었다. The purpose of this study was to predict the prognosis of class Ⅲ malocclusion treatments. 25 patients selected for this study were devided into two groups by the stability of dentitional, skeletal and soft tissue profile improvement. One was stable group which consisted of 12 children and the other was relapse group with 13 children. Various measurements in initial cephalogram were calculated and analyzed by t-test, correlation coefficient and discriminant analysis. The results of this study were summarized as follows: 1. In both stable and relapse groups, there was not distinct difference in the antero-posterior skeletal relationship(p<0.05). 2. As the result of wits, AB to occlusal plane angle and occlusal plane to mandubular plane angle, the occlusal plane of relapse group was slopper than that of the stable group. 3. In correlation coefficient analysis, the overjet and the occlusal plane to mandibular plane angle showed significant correlations(P<0.001, P<0.01). 4. The discriminant function was obtained from three major influential measurements; overjet, AB to occlusal plane angle and articular angle, and this function could discriminate correctly in 88% of these samples.

안모의 수직적 양태에 따른 골격 및 치조골의 위치 관계에 관한 연구

오중식,국윤아,김상철 대한치과교정학회 1999 대한치과교정학회지 Vol.29 No.3

교정 증례의 분석 예후 추정은 두개골의 수평 및 수직적인 관계가 동시에 고려되는 입체적 관점에서 평가되어야 한다. 따라서 본 연구에서는 성장이 완료된 성인 남녀 각 100명을 추출하여 두부 방사선 사진을 채득한 후 하안면 고경과 상안면 고경의 비율로 안모의 수직적 수직적 형태를 구분하여 군을 설정하였으며 이들 군간의 골격 및 치조골의 크기와 위치 관계를 비교하고 상호 관련성을 조사하여 다음과 같은 결과를 얻었다. 1. 치조고경, 안면 고경, lower gonial angle, 그리고 FMA 항목에서 하안면 고경이 큰 군의 것이 작은 군에 비하여 유의하게 크게 나타났다. 2. 치조고경, 안면고경, 하악지 고경, 그리고 Jarabak ratio 항목에서 남서이 여성에 비하여 유의하게 크게 나타났다. 3. 치성 및 골격성의 수직계측항목과 UAFH/LAFH의 상관관계 조사에서 치조고경,안면고경, lower gonial angle, FMA 그리고 Bjok's Sum 항목이 UAFH/LAFH와 유의한 상관관계를 보였다. The purpose of this study was to investigate the variations of the skeletal and dentoalveolar dimensions in relation to vertical facial patterns. Lateral cephalogram of 200 cases (100 cases of male and 100 cases of female, average age of which was 23.2 years) were traced and some measurements of skeletal and dentoalveolar dimensions were measured. The ratio of UAFH/LAFH was employed to classify the samples into groups of excess and short lower anterior facial height. And the comparison between two groups were taken statistacally. The following results were obtained. 1. The dentoalveolar height, lower anterior facial height, lower gonial angle, and FMA in the excess-lower-anterior-facial-height group were significantly larger than those in short-lower-anterior-facial-height group. 2. The dentoalveolar height, ramus height, and Jarabak ratio in the male subjects were significantly larger than those in the female subjects. 3. The UAFH/LAFH ratio showed a significant correlation to upper, lower facial height, AUDH, PUDH, ALDH, PLDH, Lower gonial angle, FMA, and Bjork's Sum.