이온교환막을 통한 전해질 용액의 이동 특성

박형관,한정우,선용호,조영일 연세대학교 산업기술연구소 1989 논문집 Vol.21 No.1

The transport characteristics of electrolyte osmosis through the perfluorinated cation exchange membrane, Nafion NX-430, was inverstigated. The order of electrolyte permeation velocities of single valent ions was:??>??>??>??. At constant concentration ratio the electrolyte fluxes have shown maximum and minimum values with respect to electrolyte concentration, which is called anomalus osmosis. The correlations between potassium ion fluxes and concentration ratios was shown as follows. ?? The effective charge density calclated from membrane potential was 1% of the fixed charge concentration.

완전뇌허혈후 재관류시에 국소뇌혈류, 체성감각유발전위 및 신경학적 회복에 대한 Mannitol과 Thiopental의 효과

박춘근,이상원,박영섭,최승진,허필우,정동섭,강준기,최창락 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.2

The cardiopulmonary bypass or cerebral circulation arrest is often used in the treatment of complex aneurysm or of arteriovenous malformation to decrease the risk of intraoperative aneurysm rupture. Although experimental studies have suggested that some drugs may protect the brain from ischemic injury, there are limitations in maintaining cerebral perfusion arrest without incurring neurologic deficits due to the initiation of detrimental processes including excitotoxic neuronal injury, activation of phospholipases, influx of calcium, and generation of damaging free radicals. The purpose of this study is to determine wheter mannitol or thiopental has any favorable effects on the recovery of neurologic deficits and on the regional cerebral blood flow(rCBF), somatosensory evoked potential(SEP) and electroencephalogram(EEG) in cats which underwent 15 minutes-complete global ishcemia-reperfusion. The complete global ischemia was produced in 38 cats by temporary intrathoracic occlusion of the innominate artery and the subclavian artery following ligation of bilateral mammary arteries and simultaneous induction of hypotension. The cats were allocated randomly to one of 4 treatment groups : (1) control group, 8 cats received equal volume of saline solution : (2) thiopental group, 10 cats received 45㎎/㎏ thiopental intravenously, (3) mannitol group, 10 cats received 2g/㎏ mannitol intravenously, (4) combined mannitol and thiopental group, 10 cats received equal dose of mannitol and thiopental intravenously. The drugs were administrated in a equally divided dosage before and after the ischemic episode. The results were as follos : 1) Eight animals which received saline showed the severe postischemic hypoperfusion and poor recovery of SEP and EEG, and 6 of them died within 6 hours after the ischemia. 2) Ten thiopental-treated animals also showed the severe postischemic hypoperfusion and poor recovery of SEP and EEG, and 6 of them died within 6 hours the ischemia. 3) Both mannitol-and combined treated groups showed early recovery of EEG, good recovery of SEP and EEG without the severe postischemic hypoperfusion, and 7 of 10 mannitol-treated animals and 8 of 10 combined treated animals were significantly recovered in all parameters. There were not significant differences in all parameters between the mannitol-and combined treated groups. 4) Thirty-four of 38 animals involved in this 15 minutes-ischemia resulted in the severe neurologic deficits inspite of treatment with mannitol, thiopental or both of them. These results suggest that, in cats, mannitol treatment is effective but not thiopental in preventing severe neurologic injury following complete global ischemia and the duration of complete ischemia should be far less than 15 minutes.

코일형 곡관에서 층류맥동유동의 전단응력분포

박우룡,유영태,모양우,최주호 順天大學校 1992 論文集 Vol.11 No.1

The characteristics of the shear stress distributionsrare studied theoretically and experimentally for the laminar steady flow and the laminar pulsating flow generated by butterfly valve in the coiled pipes with the curvature ratio of 30. The shear stress distributions are abruptly changed from θ = -60˚~-40˚ in the plane direction. The shear stress distributions for the laminar steady flow and the pulsating flow increase abruptly near the wall.

連續回分式 反應器에서 基質과 암모니아除去에 미치는 溫度의 影響

朴永圭,金鐘佑 嶺南大學校 環境問題硏究所 1984 環境硏究 Vol.4 No.2

The tempetrature effects were investigated in this research on the substrate removal during the fill period and nitrification during the aeration period for the treatment of the synthetic wastewater by sequencing batch reactor process. The substrate removal rate was ?? during the fill period at 30℃ in the case of the low-loading COD of 508mg/ℓ, and its of the high-loading COD of 1,021mg/ℓwas ??. It was found that the removal efficiency of COD was obtained more than 93% after the aeration period, and also that the substrate removal efficiency was not affected during the aeration period by temperature such as 25℃,30℃,35℃and 40℃ but the ammonia removal was affected by temperature. The specific nitrification rate was ?? at 30℃for the low-loading and its for the high-loading was ?? respectively. After the aeration period, sludge volume indexes(SVI)for the low and high-loading were 113~133 and 68~82, respectively.

코일형 곡관에서 층류맥동유동의 압력분포

박우룡,모양우,최주호,유영태 順天大學校 1992 論文集 Vol.11 No.1

The characteristic of the pressure distributions are studied theoretically and experimentally for the laminar steady flow and the laminar pulsating flow generated by the butterfly valve in the coiled pipes with the curvature ratios of 7 and 30. The pressure gredient ratios affact with Wormersley numbers, Dean numbers, velocity amplitude ratios and time averaged Reynolds numbers. The pressure gredient ratios of oscillatory components increase according to increasing the Wormersley number and the velocity amplitude ratio.

심부전증에서 Doppler Tissue Image를 이용한 비동시성 심실수축(Myocardial Dyssynchronicity)의 측정 : 심전도와비교 Comparison with EKG

구소영,조구영,한성우,최승혁,박우정,두영철,홍경순,오동진,이영 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.4

돼지감자에 있어서 系統別 栽植距離와 主莖切斷詩期가 生育 및 收量에 미치는 影響

高永友,吳現道,朴昌奎 濟州大學校 亞熱帶農業硏究所 1987 亞熱帶農業硏究 Vol.4 No.-

돼지감자의 系統別 栽植距離와 主莖切斷時期를 달리하여 生育, 收量 및 糖含量의 變化를 調査하였다. 그 結果를 要約하면 다음과 같다. 白色種보다 赤色種이 株當 塊莖數가 顯著히 많았으며, 塊莖數量도 많았고, 塊莖의 크기도 컸다. 疎植하였을때에 比하여 密植하였을 경우 10a當 地上部와 塊莖收量은 增加하는 傾向이었다. 二系統에 있어서 株當 塊莖種은 草長, 莖直徑, 莖當 節數, 株當 分枝長, 地上部 收量, 株當 塊莖 乾物重과 相關關係가 있었다. 株當 塊莖數는 白色種에서 다른 形質과 有意的인 相關關係는 없었으나 赤色種에서는 다른 形質과 有意的인 相關이 있었다. 主莖切斷時期에 있어서 切斷區에 比해서 無切斷區가 地上部와 塊莖收量이 많았으며, 切斷時期가 이를 수록 약간 增收하는 傾向을 보였다. 白色種이 赤色種보다 糖含量이 높았으며 收穫時期別 糖含量이 變化는 거의 없었다. 貯藏中의 糖含量이 變化는 貯藏期間에 따라 거의 變化 없었으며, 長期間 貯藏이 可能하였다. Field experiment was conducted to determine the effects of spacing in row and main stem cutting date on growth and yield of Jerusalem artichoke. Investigated were also the effects of harvesting date and storage period on sugar content of tuber. The results obtained are as follows; The red line had more tubers per plant and smaller tuber than the white line but the white had more tuber yields than the red line. Top and tuber yield of two lines increased with decreasing spacing in row. Fresh weight of tuber per plant correlated with plant length, diameter of stem, number of nodes per stem, length of branch per plant, fresh and dry weight of top per plant and dry weight of tubers per plant in two lines. Significant correlations between the number of tubers per plant and the other characters were observed in the red lines but were not in the white lines. Top and tuber yield of two lines were decreased by main stem cutting dates and tended to decrease with delaying cutting date of main stems. The white line had a higher sugar content than the red line. Sugar content of two lines was not affected by harvesting date. There was almost no change of sugar content during the storage period indicating that storage of tuber for a long time is possible.

염색폐수처리에서 유동성 메디아를 사용한 산소활성슬러지법의 평가

김우항,박영규 木浦海洋大學校 2000 論文集 Vol.8 No.1

The dyeing wastewater containing biologically recalcitrant and color producing compounds such as dyes and surfactants, is generally considered to be one the most complex wastewater with regard to treatability. At present, the activated sludge process following the chemical coagulation process is being usually used for the treatment of dyeing wastewater. Thus, it is necessary to develop the more simple treatment process to treat refractory organic pollutants color form the effluent. Oxygen activated sludge process with fluidized midia (OASFM) was tested to evaluate design parameters. In this study, the complex dyeing wastewater containing average COD_(Mn) 660 mg/l and BOD 1730 mg/l were treated by the OASFM process which operated at nearly constant MLSS 5000 mg/l. Hydraulic retention time of this process was changed from 12 to 24 hours. The effluent COD of OASFM process was 124-175 mg/l less than 161-225 mg/l of OAS process. In the OASFM process, the optimum conditions were 20 % of media packing rate and 30℃ of temperature. At that condition, the BOD removal efficiency was 99% and COD removal efficiency was 77%.

냉적응 생쥐의대식세포 활성화에 미치는 PKC 억제제와 Ca^(2+) Antagonist의 영향

정노팔,박한우,최인호,오영근,신형철 大韓免疫學會 1995 大韓免疫學會誌 Vol.17 No.3

Human thymus 조직으로부터 cDNA library를 만들었다. 무작위로 선별한 cDNA clone중에서 468개 염기로 된 cDNA clone (PTH209)을 검색한 결과 124개의 아미노산을 code하는 EAP(Epstein-Barr asseciated protein) 유전자임을 확인하였다. Thymus의 EAP와 Epstein-Barr 바이러스 positive 및 negative cell line의 RNP에서 분리한 EAP^(13)를 비교한 결과, coding region은 동일하였으나 3'UT region은 달랐다. 더구나 EBERs(Epstein-Barr encoded RNAs) 와 La 자가항원이 결합된 RNP의 EAP와 마찬가지로, thymus의 EAP는 sea urchin의 developmental stage-specific 단백질로 알려진 217^(2) 과 매우 유사한 아미노산 서열을 보였다. 이런 결과로 미루어 thymus의 EAP는 thymic development에 중요한 역할을 하는 것으로 사료된다. To study the adaptation of immune systems in the animals kept in cold temperature, the recovery rate of peritoneal exudated mouse macrophage was measured in mouse bred at room temperature(RT) or at cold(S±2 C). NBT-reduction activities and phagocytic activities were measured too, to the macrophages recovered. The results are as follows; More than 40% of cells were recovered in the cold treated groups compaired to the RT bred groups. The NBT-reduction activities were totally blocked at 10mM EGTA, and were below 10% of the control in H7 100pM and TMB-8 0.1mM. The NBT-reduction activity of cold treated groups were higher than RT group at lower concentration than H7100pM and TMB-8 0.1mM . The H7 resulted no changes in phagocytic activities both cold and RT groups at 0.1-100pM. The TMB-8 resulted in significant decrease in phagocytic activities at 0.1 mM and 1mM. The conclusions are 1) the cold treated animals showed an increase in the NBT-reduction activities and in the macrophage recovery rates, 2) H7 was unable to block phagocytosis of yeasts up to 10011M concentration, 3) lectin-like yeast cell surface molecules have different signaling mechanism form IgG molecules.

심실중격결손증-치험 1예-

조광현,우종수,황윤호,이양행,박철호,김종성,김철호,이경순,조영일,박태인 인제대학교 1985 仁濟醫學 Vol.6 No.4

A successful treatment of infants and children with congenital heart defects depends upon several factors: diagnosis must be accurate, the operative technique, including techniques of perfusion and myocardial preservation, must be suited to the needs of patients and intensive cares, including accurate anesthesia, must be applied through all stages of investigation and treatment, i.e. before, during and after the operation. Recently we performed a open heart surgery successfully for a six-years old girl who had suffered from frequent upper respiratory tract infection and mild to moderate exertional dyspnea with congenital heart defects (ventricular septal defect, Kirklin type II, with patent foramen ovale). The operation and postoperative course were very smooth. And now we report this with review of literatures.