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병류흐름의 비다공성 중공사막 접촉기를 이용한 산소 용해 공정 수치해석
정동재,안효성,송인호,정헌규,전현수,이용택 충남대학교 바이오응용화학연구소 2007 응용화학공학 Vol.1 No.1
분리막 접촉기는 액-액, 기-액과 같이 두개의 다른 상 사이에 막이 상 계면 혹은 상 장벽의 역할을 수행하여 두 상간의 물질전달이 이루어지게 하는 장치이다. 이러한 특성을 지닌 비다공성 중공사막 접촉기를 이용한 산소 용해 공정의 특성을 전산모사를 통해 예측하였다. 공급물과 투과물이 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 흡수 거동 예측 프로그램을 개발하였다. 개발된 프로그램을 사용하여 수치해석을 수행한 결과, 산소 용해 공정에 중요한 인자로 산소 기체의 투과 구동력, 유효 막면적과 체류 시간임을 알 수 있었다.
Control of oxygen concentration in water using a hollow fiber membrane contactor
이용택,Dongjae Jeong,Mihye Yun,Ina Yum 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.3
A novel theoretical analysis was performed to regulate the oxygen concentration in water using a membrane contactor composed of nonporous hollow fibers. The governing ordinary differential equations were derived for the countercurrent flow of the feed water and the feed gas in a membrane contactor. The governing equations were regarded as a two point boundary value problem. The nonlinear ordinary differential equations were simultaneously solved using a finite difference method. The computer program was coded in Fortran language using the Compaq Visual Fortran Software. It was found that the concentration of oxygen dissolved in water increases from 28.9 to 64.3 ppm as the area of the membrane increases from 1.24 to 3.73 m2 at the given typical operating condition: the flow rate of the feed gas is kept to be 1.0 L/min; its pressure is maintained to be 4 atm; the flow rate of the water is 15 L/min. It is observed that the concentration of oxygen increases from 48.2 to 56.2 ppm as the concentration of the feed gas increases from 0.75 to 0.95 mole fraction. As the flow rate of the water increases from 15 to 25 L/min, the concentration of oxygen decreases from 56.2 to 38.6 ppm with a constant membrane area of 3.11 m2.
Combination Treatment of Hepatic Arterial Infusion Chemotherapy and Sorafenib
( Chai Ho Jeong ),( Seung Hoon Kim ),( Dongjae Lee ),( Myeong Jun Song ) 대한내과학회 2015 대한내과학회 추계학술발표논문집 Vol.2015 No.1
Patients with advanced HCC, although sharing a median survival of less than a year, may present with heterogeneous performance statuses and different tumor burdens, from single nodules associated with limited portal vein thrombosis (PVT) to multiple intrahepatic metastasis associated with extrahepatic spread. For patients with advanced HCC, sorafenib is the current standard treatment. Other alternative therapies are required due to limited treatment response and tolerability of sorafenib. Clinical trials of hepatic artery infusion chemotherapy (HAIC) has shown favorable efficacy and tolerability for advanced HCC patients in Korea. However, the synergistic effect of HAIC and sorafenib have not been clarified. We report a case of 58-year-old female who showed a partial response after hepatic artery infusion chemotherapy (HAIC) combined with sorafenib. She showed a decrease of tumor size and tumor marker after 3 cycle of HAIC. After combined treatment, the patient showed better treatment response and favorable overall survival. This case showed the favorableefficacy and survival benefit of combination treatment of HAIC and sorafenib in advanced HCC patients with PVT. In the future, randomized trial to identify the efficacy and safety of combined treatment is necessary.
( Jung Wha Chung ),( Dongjae Jeong ),( Namkyu Kang ),( Eun Sun Jang ),( Sook-hyang Jeong ),( Jin-wook Kim ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Hepatocellular carcinoma (HCC) is one of the adverse clinical outcomes of alcoholic liver disease, but the risk is relatively low compared to those of chronic viral hepatitis. Alcohol increases the risk of colorectal adenoma and adenocarcinoma. In this study, we evaluated the relationship between detection of colorectal neoplasm and subsequent risk of HCC in alcoholic liver disease patients. Methods: This retrospective cohort study enrolled all consecutive patients with alcoholic liver disease who underwent colonoscopic screening in our institute. The risk of HCC development was compared by Kaplan-Meier analysis with log-rank test. Cox proportional hazard analysis was used to identify independent risk predictors for HCC. Results: A total of 1,294 patients were included. The median duration of follow-up was 62.3 months (range 12.1-163.9). Colonoscopic screening revealed hyperplasia, low-grade dysplasia, high-grade dysplasia and adenocarcinoma in 10.7, 37.2, 0.9 and 2.2% of patients, respectively. The cumulative incidence of HCC was 0.8%, 2.1% and 3.1% at 3, 5, 10 years, respectively after initial colonoscopic screening. Univariate analysis showed that old age, low albumin, high AFP, prolonged prothrombin time, daily alcohol consumption amount, smoking and history of colorectal adenocarcinoma was associated with significant increased risk for HCC. Cox analysis showed that low albumin, high AFP, prolonged prothrombin time and history of colorectal adenocarcinoma were independent HCC risk predictors with hazard ratio of 0.39, 2.33, 5.59 and 3.73, respectively. Conclusions: Detection of colorectal adenocarcinoma increased the risk of subsequent development of HCC in patients with alcoholic liver disease.
Hong, Sungwon,Kim, Dongjae,Jeong, Yanghwan,Kim, Eunjoo,Jung, Jae Chil,Choi, Nakwon,Nam, Jaewook,Yip, Alex C. K.,Choi, Jungkyu American Chemical Society 2018 Chemistry of materials Vol.30 No.10
<P>It is quite challenging to avoid microdefect formation during hydrothermal growths and/or calcination processes, while manufacturing high-quality zeolite membranes in a reproducible manner. Even less than 1% of defects, which generally provide nonselective pathways, will considerably worsen the intrinsic, high molecular sieving-based separation performance of a continuous zeolite membrane. Herein, we propose a simple and reliable method for blocking defects using water-soluble dye molecules, which were originally used for the visualization of nonzeolitic, defective structures in a zeolite membrane. Because the dye molecules are ∼1 nm in size, they cannot diffuse into the zeolitic pores and selectively access the defects. For the demonstration of dye-based defect healing, we chose a siliceous chabazite type SSZ-13 zeolite membrane (pore size = 0.37 × 0.42 nm<SUP>2</SUP>) with some degree of defects and investigated the effect of defect healing on the final CO<SUB>2</SUB> separation performance. Because the defects were gradually filled by the dye molecules, both CO<SUB>2</SUB>/N<SUB>2</SUB> and CO<SUB>2</SUB>/CH<SUB>4</SUB> separation performances were concomitantly increased. Intriguingly, the CO<SUB>2</SUB> perm-selectivity test with ternary mixtures including H<SUB>2</SUB>O vapor (the third largest component in the flue and natural/shale/bio gas streams) in the feed diminished CO<SUB>2</SUB> separation performance. This could be ascribed to inhibited transport of the fast permeating species, here CO<SUB>2</SUB>, from the adsorbed H<SUB>2</SUB>O molecules on the dye-treated and water-friendly (relatively hydrophilic) membrane surface. On the contrary, the intact, siliceous (water-repelling or hydrophobic) SSZ-13 membranes showed improved CO<SUB>2</SUB> perm-selectivities in the presence of H<SUB>2</SUB>O vapor, seemingly due to defect blocking by the physisorbed H<SUB>2</SUB>O molecules.</P> [FIG OMISSION]</BR>