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이용택,정헌규,안효성,송인호,전현수,정동재 한국막학회 2007 멤브레인 Vol.17 No.4
비다공성 중공사막 접촉기를 이용하여 수용액 내 용존 산소의 농도를 조절하고자 하였으며, 용존 산소의 농도를 전산모사를 통하여 예측하였다. 공급 기체와 공급 수용액이 같은 방향으로 흐르는 병류 흐름 시스템에 대한 분리막 접촉기 공정 지배 미분 방정식을 5차 Runge-Kutta-Verner 법으로 해석하였다. Compaq Visual Fortran 6.6 소프트웨어로 용존 산소농도 예측 프로그램을 개발하였다. 개발된 프로그램을 사용하여 수치해석을 수행한 결과, 분리막 수가 16,000개로 일정하며 공급기체의 유속이 0.536 mol/sec이고 압력이 486 kPa이며 공급 수용액의 유속이 16.69 mol/sec이고 산소의 몰분율이 0.995으로 유지된 상태에서, 분리막의 길이가 0.4에서 1.2m로 증가함에 따라 용존 산소는 30에서 64 ppm으로 증가하였음을 알 수 있었다. 분리막의 길이가 0.4 m일 때 공급수용액의 유속이 9.26에서 26.85 mol/sec로 증가함에 따라 용존 산소가 40에서 20 ppm으로 감소함을 알 수 있었다. 또한 공급 기체 압력이 298에서 847 kPa으로 증가함에 따라 용존 산소는 33에서 69 ppm으로 증가함을 알 수 있었다. A nonporous hollow fiber membrane contactor was used to control the concentration of oxygen dissolved in an aqueous solution, which was predicted along the hollow fiber membrane using a computer simulation. The governing ordinary differential equations were derived for the occurrent flows of the feed aqueous solution and the feed gas mixture in a membrane contactor and they were numerically solved using the 5th Runge-Kutta-Verner method with a personal computer, where the program was coded utilizing a software of the Compaq Visual Fortran 6.6. It is found that the concentration of oxygen dissolved in water increases from 30 to 64 ppm as the length of the hollow fiber increases from 0.4 to 1.2 m when the membrane of fibers are equal to be 16,000; the flow rate of the feed gas is kept to be 0.536 mol/sec; its pressure is maintained to be 486 kPa; the flow rate of the water is 16.69 mol/sec. As the flow rate of the water increases from 9.26 to 26.85 mol/sec, the concentration of oxygen decreases from 40 to 20 ppm with the constant fiber length of 0.4 m. Finally, it is observed that the concentration of oxygen increases from 33 to 69 ppm as the pressure of the feed gas increases from 298 to 847 kPa.
이용택,류영우,이동민,박상욱,염승희,한준현 대한비뇨의학회 2011 Investigative and Clinical Urology Vol.52 No.11
Purpose: This study was conducted to perform a comparative analysis of the efficacy and safety of conventional transurethral resection of the prostate (TUR-P), transurethral resection in saline (TURIS), and TURIS-plasma vaporization (TURIS-V) when performed by a single surgeon for benign prostatic hyperplasia (BPH). Materials and Methods: The clinical data of 73 consecutive men who underwent conventional TUR-P (39), TURIS (19), or TURIS-V (15) for BPH were retrospectively analyzed. All procedures were carried out by a single surgeon between October 2007 and April 2010. The patients were assessed preoperatively and perioperatively and were followed at 1, 3, and 6 months postoperatively. Patient baseline characteristics, perioperative data, and postoperative outcomes were compared, and major complications were recorded. Results: In all groups, significant improvements in subjective and objective voiding parameters were achieved and were sustained throughout follow-up. TURIS-V had the shortest operation time compared with conventional TUR-P and TURIS (p=0.211). TURIS-V significantly decreased procedural irrigation fluid volume, postoperative irrigation duration, catheter duration, and hospital stay compared with conventional TUR-P and TURIS. There were no significant differences between the groups in hemoglobin levels or serum sodium levels before and after the operations. There were three transfusions and four clot retentions in the TUR-P group, and one transfusion and one clot retention in the TURIS group. The TURIS-V group had no complications. Conclusions: TURIS and TURIS-V were effective for the surgical treatment of BPH in addition to conventional TUR-P. TURIS-V was not inferior to conventional TUR-P or TURIS in terms of safety.
칼륨 이온으로 치환된 NaA형 제올라이트 분리막의 투과증발 특성
이용택,윤미혜,정헌규,정동재,안효성 한국막학회 2008 멤브레인 Vol.18 No.3
열적, 기계적, 화학적 안정성이 우수한 제올라이트 분리막의 물/에탄올 선택도를 이온교환 실험을 통해 더욱 효과적으로 높이고자 하였다. KA형 제올라이트 분리막을 직접 합성하는 것은 용이하지 않으므로 NaA형 제올라이트 분리막을 합성한 후 이를 다시 이온교환 하여 KA형 제올라이트 분리막을 제조하였다. 공급되는 에탄올의 농도 변화 및 투과 증발실험 온도의 변화가 투과플럭스와 물 선택도에 미치는 영향을 고찰하였다. 이온교환 실험 후 전체 투과플럭스는 감소하였고 물 선택도는 증가함을 관찰할 수 있었다. Zeolite A have been known to be chemically, mechanically and thermally quite stable. The ion-exchanged membranes were tested for the removal of water from ethanol/water mixtures by pervaporation. Since it is quite difficult to prepare the potassium form of zeolite A by a direct synthesis, it was obtained by the ion-exchange method from NaA zeolite. The effects of concentration of ethanol at the feed side and the temperature were studied on the permeation flux and the separation factor of water. After Na+ ion was exchanged to K+ ion, it was found that the total flux decreased and the separation factor increased.