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성인 음낭수종의 치료로서 Window Operation의 효용성
서병욱,박영호,이남규,전윤수,김민의,김영호,송윤섭,구자현 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.1
We intended to determine the usefulness of window operation for adult hydrocele repair. We reviewed medical records of 132 patients from January 1995 to June 1998 with primary hydrocele and evaluated complications and recurrence rates of eversion and/or excision, plication, and internal drainage technique. Recurrence rate was highest in internal drainage technique as 85.2%, and those of eversion and/or excision and plication technique were 1.3% and 4%, respectively. Complication rate was highest in eversion and/or excision technique, and lowest in internal drainage technique. Although complication rate was lowest in window operation, this operation could not be successful due to high recurrence, and we suggest that this operation should be abandoned for hydrocele repair.
구자현,서병욱,김영호,송윤섭,전윤수,김민의,이남규,박영호 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.2
We intended to know whether all of the patients with asymptomatic microscopic hematuria should be urologically investigated routinely. We reviewed the medical records with asmptomatic microscopic hematuria from January 1995 to December 1997. Urological studies included intravenous urography or ultrasonography, urine cytology, cystoscopy and biopsy, urine AFB smear and culture and urine PCR for AFB. The age with patients ranged from 9 to 74 years(mean age: 39.7 years). Benign diseases were found in elderly patients and patients with high degree of hematuria, but there was no patients who had urological malignant disease. According to the results, we suggest that follow-up with urine cytology is sufficient to younger patients or low degree of hematuria with asymptomatic microscopic hematuria.
김해숙,한동준,임재명,전은주,최용범,김병욱,강성환,신혜영 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-
본 연구는 폐기물의 형태로 현재 산과 계곡에 투기되어 있는 석탄페석을 이용하여 중금속 흡착과 난분해성 COD 및 색도제거 가능성을 검토하고, 간단한 열처리를 통한 흡착능 개발 실험을 위하여 수행되었다. 실험 결과 천연상태의 석탄폐석은 약 20∼30%의 중금속 흡착능을 지니고 있는 것으로 나타났으며, 탄화 공정인 간단한 열처리 만으로도 약 2 ∼ 5배의 흡착능 향상이 이루어졌다. 그리고 석탄폐석의 열처리 조건 변화에 따른 중금속 흡착능 실험에서는 500℃ 에서 6시간 반응시킨 것이 가장 우수하였다. 칼럼실험에 있어 기존의 입상활성탄 보다 처리효율이 저조하나 석탄폐석은 무가공 상태로도 약 30 ∼ 60%의 COD 및 색도를 제거할 수 있었다. 500℃에서 6시간 열처리된 폐석의 컬럼실험에서 생물학적 유출수의 색도 제거에 우수함을 알 수 있었으며, 중금속 및 COD제거에 있어서는 여과 속도에 따라 많은 차이를 보였다. 본 연구에서는 열처리 공정만 적용한 기초 실험이였으나, 석탄폐석의 흡착제 개발의 가능성을 알 수 있었으며, 활성화 공정을 적용할 경우 흡착능은 더욱 향상될 것으로 판단된다. This reaserch aims to remove the heavy metals, NBDCOD, and color using the coal waste. The expermental by heat treatment. was performed to advance the adsorption capacity. The results are as follows ; ⅰ) The coal waste had the adsorption capacity of heavy metals and the rates were in the range of 20 to 30 percents. ⅱ) The heat treatment was the optimum condition that the reaction time was 6 hours at 500 ℃. ⅲ) In the column experimental, non-treated coal waste removed the COD and color in the range of 20 to 60 percents. ⅳ) Heat-treated coal waste showed the high removal rate of the color in biological effluent, but heavy metal and COD removal rates were changed by the filteration rates.
박영호,송윤섭,임용순,김영호,이남규,구자현,서병욱,김민의,전윤수 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.2
Although ureteroscopy(URS) has been used widely to remove ureteral calculi, there is an argument against the belief that anesthesia or admission is needed for URS. We evaluated the experience of URS without anesthesia in female patients. From September 1997 to July 1998, URS was performed in 31 female patients without anesthesia. EHL(Electrohydraulic Lithotripsy) was used in 21 patients with impacted or large stone over 5mm. All patients were given oral antibiotics for 3 days and follow-up KUB was taken to confirm successful removal of the stone one week after the procedure. Successful treatment was defined as complete removal of the stone or residual fragments less than 2mm. Overall success rate was 96.7%(30 cases among 31 cases). All but one patient tolerated with analgesia through the entire procedures. There were only minimal complications such as mild flank pain and hematuria. So, we recommend that non-anesthetic ureteroscopic removal of stone as the first choice for treatment of lower ureteral stones in female based on the minimal morbidity, high success rate and low cost.
Enzymatic Conversion of CO₂ Reduction into Molar-scale Formate in the Flow Cell
Byoung Wook JEON,Jungki RYU,Yong Hwan KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Electrochemical CO₂ reduction is a challenging issue for its fixation and utilization toward carbon-neutralization. Despite excellent catalytic activity and selectivity, electrochemical CO₂ reduction by enzymes has progressed rather slowly relative to that by electrochemical catalysts due to poor O₂-tolerance and the undesirable reversibility. In this study, we report efficient and scalable production of formate on a molar concentration level by electrochemical reduction of pure CO₂ and even real waste gas of steel mill using a formate dehydrogenase (FDH) from Methylobacterium extorquens AM1 (MeFDH1). Electrochemical analyses demonstrated that remarkable characteristics of MeFDH1 (e.g., high affinity for reduced electron mediators, limited reversibility, and high O₂-tolerance) allow for such notable utility. To apply this system in industrial field, the flow cell system is essential. Unlike batch system, flow cell allows the reaction system to be continuous to produce formate and to modulate each component (e.g., immobilized enzyme, electrolyte volume, the structure of cathode cell) independently. In further, ion-exchange (IEX) resin was set up for in-situ separation of produced formate from electrolyte selectively. Due to the reversibility of FDH activity, increased concentration of formate in the electrolyte led to decline CO₂ reduction rate. in-situ separation in flow cell system proved that dominant factor for declined productivity in CO₂ reduction is from reversible product inhibition, exhibiting a stable current in long-term operation. This result suggested not only efficient in-situ separation process but also the long-term stabilization of formate productivity.