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권충진(Chung-Jin Kwon),김도영(Do-Young Kim),임봉수(Bong-Su Lim) 대전대학교 환경문제연구소 2011 환경문제연구소 논문집 Vol.15 No.-
We performed water analysis at the water quality measuring points of Gap Stream and Youdenug Stream to examine the water quality impact by the Youdeung Stream inflow to Gap Stream Lake Park due to moving of movable weir. As analytical results, the SS concentration was found to be high during a rainy season, but during a dry season COD and TP concentrations were found to be high. Especially, the TP was higher after the moving of movable weir. From the measuring results of sediments of Gap Stream Lake Park, the concentration of organic matter due to the decrease of flow rate of water was higher than a non-freshwater period, and the downstream concentration of organic matter was found to be higher than the upstream of Lake Park during a fresh water period. The analytical results of water quality for the inflow of Yudeung Stream for maintaining utility water of Daejeon Stream showed no concentration difference according to the points in organic matters and nutrient salts, but the COD and SS concentrations were found to be partially high in the Okgye Bridge outfall. In case of heavy metals they were not mostly detected, so their effects were not high.
오존산화법에 의한 제지폐수 활성슬러지공정 유출수의 유기물질 제거효율
임봉수(Bong-Su Lim),권충진(Chung-Jin Kwon),김준영(Joon-Young Kim),강아람(A-Ram Kang) 대전대학교 환경문제연구소 2010 환경문제연구소 논문집 Vol.14 No.-
We used a conventional activated sludge process to treat a paper wastewater, and then the effluent was treated with an ozone oxidation process as advanced process to remove non-degradable materials. It was found that the removal efficiency rates of the organic matter has been rapidly increased initially, and then it was almost constant after this period. The concentration of ozone should be recommended to maintain approximately 8.3 mg/L during this operation to keep the CODmn value below 100 mg/L and ozone contact time longer than 60 min.
체외충격파를 이용한 두부손상 모델에서 ¹H 자기공명 영상의 변화와 ^(31)P 자기공명분광법으로 관찰한 뇌의 고에너지 인 대사에 관한 실험적 연구
권양,황충진,최길수 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.12
The purpose of this study is to describe the ¹H MR imaging findings of focal brain injury by ESWL(Extracoporal Shock Wave Lithotripsy) and to evaluate the changes of high energy phosphate metabolism of the injury using ^(31)P MR spectroscopy. Spectral changes of high energy phosphate metabolites. including Pi(inorganic phosphate). PCr(phosphocreatine). and Adenosine Triphosphate(ATP) were monitored in both trauma(n=5) and control(n=5) groups over 8 hour period following injury. And 'H MR imagings were obtained to evaluate the focal cerebral lesions(n= 10) and compared with the gross and histologic findings of the specimen. The results were as follows : 1) In proton density-weighted MR images. focal areas of high signal intensity were seen in the cerebral hemispheres in S out of 8 traumatized cats(24KV. 500x shock wave). There were corresponding edematous changes in the white and gray matter and petechial hemorrhage in the cortex on gross and histopathologic studies. In 2 traumatized cats(24KV. 1000x shock wave). there were large hematomas in the cerebrum. 2) The decrease of brain pH was maximum in 30 minutes after ESWL injury in the trauma group(n=5) when compared with the control group, but statistical difference between two groups was insignificant. 3) In the trauma group. initial decrease of PCr/Pi was found in 30 to 60 minutes with return to control levels by 2 hour after injury(p<0.05). followed by a second decline in 4 hour that persisted for the remaining 5 hour observation period(p<0.05). 4) No significant changes in ATP concentration were observed during the experimental period. In conclusion, the changes seen above after focal brain injury using ESWL may be indicative of altered energy production, which may account for the reduced capacity of the cell to recover from traumatic injury.
권양,이정교,권병덕,이동준,황충진 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.4
In recent years, an increasing number of patient with AOVMs have been recognized using MRI. When an AOVM is located in a region associated with an unacceptable surgical risk, stereotactic radiosurgry offers an alternative treatment. We treated 21 patients with AOVM using gamma knife radiosurgery from June, 1990 to December, 1993 at Asan Medical Center. The indications for radiosurgery were as follows : 1) Patients who had episodes of hemorrhage from a lesion that had the characteristic images of AOVM in MRI. 2) Patients who had seizures and the focus of these seizures corresponded to the lesion. 3) Patients were excluded if the lesions were located superfically or were accessible to microsurgery. Nine patients presented with hemorrhages and twelve with seizures. The marginal dose was ranged from 10 to 25 Gy at or above the 50% isodose line. Of eight patients followed 12 months or less after radiosurgery, two patients had improved neurologic deficits and one had decreased the seizure frequency with mediciation. Among seven patients followed 12-24 months, MRI showed a reduction of the lesion in one patient and no change in five patients. One patient had perifocal edema. In two patients with seizures, one patient was seizure free without medication and one patient was controlled with medication. In six patients between 24 and 44 months, two patients had smaller lesions and three patients had perifocal edema. Among four patients who had seizures, one patient was seizure free without medication and three had decreased the seizure frequency with medication. Postoperative complications developed two patients, but one patient showed improvement of neurologic deficits after a short period of steroid medication. Stereotactic radiosurgery offers a treatment to a selective patients with intracranial AOVMs.