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.

수평 2중관 열교환기내에서 R-22와 그 대체냉매의 응축 열전달 특성

오후규,박기원,문정욱,노건상,이상훈 麗水水産大學校産業技術硏究所 1997 産業基術硏究所 論文集 Vol.6 No.-

Compared experimental results for forced convection condensation of R-22 and its alternative refrigerants inside a horizontal smooth tube are presented. The pure refrigerant, azeotropic refrigerant mixtures and binary and ternary non-azeotropic refrigerant mixtures are used as the test fluids and a double pipe heat exchanger is used. The refrigerant mass flow rate and temperatures were measured. Using the data, the heat flux, quality and local and mean heat transfer coefficients for the condensation have been obtained. Local heat transfer coefficients for R-22 and its alternative refrigerants were measured at top, side and bottom of the test tube. The results indicated that the heat transfer coefficient of pure and azeotropic refrigerant mixtures was higher than at top of the tube. Non-azeotropic refrigerant mixtures, however, were higher than side and top of the tube. Mean heat transfer coefficients for non-azeotropic refrigerant mixtures increased with refrigerant mass velocity and quality, but were considerably lower that of pure refrigerant and azeotropic refrigerant mixtures.

정밀가공 부품의 진원도 특성 평가에 관한 연구

오상록,이갑조,김종관 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

The dimensions and forms of precise machined parts are different to kinds of machine. It will be variant according to machine wear, tool form, cutting method and cutting condition at the same machine. At that time, the most important things are controlled and measured by appropriate measuring instruments. This paper aims to contribute to improving measurement accuracy through evaluation and consideration about various roundness in the machining company.

精神分裂症患者의 幻覺에 對한 精神病理學的 考察 : Hun Adaptation of Bender-Gestalt Test 및 Mini-Mental Test를 중심으로

오상우,이귀행,박종호 大韓神經精神醫學會 1992 신경정신의학 Vol.31 No.2

To evaluate the state of perceptual distortion experienced by Schizophrenic hallucinations the Hutt Adaptation of the Bender-Gestalt test(HABGT) and Mini-mental test were performed on two subgroups of schizophrenics. 28 hallucinated schizophrenics(hallucinated group) and 28 nonhallucinated schizoprirenicsCcontrolled group). Psychopathology scale. Adience-abience scale. Regression level were applied to the results of HABGT of both groups. The results of Mini-mental test suggested that hallucinated group had less organic brain damage than controlled group. The results of HABGT suggested that hallucinated group had better ability in external object perception, reasonable ego function, adaptation and emotional control than controlled group. The clinical and psychopathological meanings of these findings were discussed.

두경부자세 및 혀, 설골의 위치가 두개안면형태에 미치는 영향에 관한 연구

오진섭,태기출,국윤아,김상철 대한치과교정학회 1998 대한치과교정학회지 Vol.28 No.4

두경부 자세 및 혀, 설골의 위치와 두개안면골격간의 연관성을 알아보기 위해, 원광대학교 치과대학 재학생 중 선천적 두경부 이상이나 결손치가 없고 과거 교정 치료나 보철치료의 경험이 없는 남자 50명과 여자 40명을 대상으로 natural head position(NHP)상태에서 두부방사선 사진을 채득하여 전통적인 두개내 참고선과 두개의 진성 참고선을 이용하여 계속한 결과 다음과 같은 결론을 얻었다. 1. 두경부 자세변수들에서는 남녀간 차이가 없었으나, 설골의 위치는 남자가 여자에 비해 더 전하방에 위치하였으며, 더 큰 전하방 경사도를 보였다. 2. 경추의 경사도가 클수록 NHP에서 안면돌출도는 작게 나타났으며, 경추의 전방만곡이 증가할수록 수직적인 안모형태를 보였다. 3. 두경부각이 작을수록 두개저에 대하여 설골이 전방에 위치하였으며, 두경부각과 설골의 수직적인 위치는 연관성을 보이지 않았다. 4. 하악골이 전돌될수록 설골은 전방에 위치하였으며, 두개안면형태와 설골의 수직적인 위치는 미약한 연관성을 나타냈다. The purpose of this study was to examine the associations of head posture, the position of the tongue or the hyoid bone to craniofacial structure. Cephalograms taken in Natural head position(NHP) of 90 dental students (50 in male, 40 in female, 20 to 30 years in age) were traced and measured using the extracranial true horizontal and vertical lines. The obtained results were as follows; 1. There was no sex difference in head posture, but the hyoid bone was placed anteroinferiorly in male more than in female and anteroinferior inclination of the hyoid bone showed greatly in male. 2. The more inclined was the cervical column, the less prognathic was the face in natural head posture, and the larger cervical curvature, the more vertical pattern of the face. 3. The less small showed craniocervical angulation, the more anteriorly placed was the hyoid bone to the cranial base, and there was no significantly association between craniocervical angulation and the vertical position of the hyoid bone. 4. The more prognathic was the mandible, the more anteriorly placed was the hyoid bone, and there was slightly association between the craniofacial morphology and the vertical position of the hyoid bone.

유산소성 운동 강도가 혈중 알코올 농도에 미치는 영향

오승렬,오상덕,김태욱,박원화 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

This study was to examine the most effective exercise intensity to decrease blood alcohol level under the condition of the same exercise volume after alcohol ingestion The subjects of the study were 7 students who enrolled in physical education major at H University, The blood alcohol levels of subjects were recorded and analyzed in different exercise condition, which were without exercise, HRmax 50% aerobic exercise, HRmax 70% aerobic exercise at each exercise situation(before, immediately after, 65rnins after, and 120mins after exercise). The effects of aerobic exercise on blood alcohol level and the changes in blood alcohol concentration level according to aerobic exercise intensity were as follows : 1. The blood alcohol levels in non-exercise group, HRmax 50% exercise group, and HRmax 70% exercise group illustrated significant difference(p<.05), In post hoc test, there was significant difference between non-exercise group and HRmax 50% exercise group (p<.05). In addition, there was significant difference between non-exercise group and HRmax 70% exercise group(p<.05). However, the blood alcohol levels in HRmax 50% exercise group and HRmax 70% exercise group did not show significant difference(p>.05). 2. The levels of decreasing blood alcohol concentration in the exercise situation(before, immediately after, 60mins after, and 120mins after exercise) showed significant difference(p<.001). 3. The interactive effect between exercise group and exercise situation illustrated significant difference(p<.001). As mentioned above, aerobic exercise was effective to decrease blood alcohol level after alcohol ingestion but under the condition of the same exercise volume the change of blood alcohol levels according to exercise intensity did not show significant difference. In conclusion, the most effective and fastest way to decrease blood alcohol level was HRmax 50% aerobic exercise, that is low intensity, rest after the exercise, and slight physical activity.

배추좀나방의 유충 기생봉 프루텔고치벌의 기생특성

오미록,김상수,박종대,백종철,김도익 順天大學校 1997 論文集 Vol.16 No.1

배추좀나방의 유충 기생봉인 프루텔고치벌의 기생특성에 대해 조사한 결과는 다음과 같다. 프루텔고치벌은 배추좀나방 유충의 모든 영기에 기생하였으나, 주로 2령과 3령충을 선호하였다. 온도별 프루텔고치벌은 배추좀나방 유충에 대한 기생율은 18, 20, 25, 30℃에서 각각 41.9, 66.0, 86.0, 68.7%였다. 프루텔고치벌은 배추좀나방 유충의 밀도가 증가함에 따라 기생수는 증가하나 그 증가율은 감소하는 Holling의 제2형(포화형) 기능반응을 나타내었다. This experiment was conducted to investigate the parasitic characteristics of Cotesia plutellae Kurdjumov, a larval parasitoid of Plutella xylostella L. Although C. plutellae parasitized all 4 instars of P. xylostella, it parasitized mainly the second and third instars. Parasitisms of C. plutellae at different temperatures were 41.9, 66.0, 86.0, and 68.7% at 18, 20, 25, and 30℃, respectively. The parasitic response curve of C. plutellae to the host density indicated Holling' type Ⅱ(saturation type) functional response: the parasitism of host by C. plutellae increased with the host density but the parasitic rate decreased.