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양석환,이영주,차민석,신상훈,홍영택,오성근,이장용 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Reverse electrodialysis system can fulfill the current global electricity demand. Important requisites for ion exchange membrane in RED systems are high power density. UV-curing has easy process and performance improvement. In this study, anion exchange membranes are prepaered by UV-curing process. Specifically membranes were formed by copolymerization of brominated poly(2,6-dimethyl-1,4-phenylene oxide) as backbone and 2- (Dimethylamino) ethyl acrylate as the active polymer, using UV irradiation. Membrane properties, such as ion exchange capacity, water uptake, pH tolerance, permselectivity, area resistance were measured. In conclusion, lab-made membrane that we proposed showed excellent power density relatively greater than commercial AMV membrane under the same condition.
양석환,이영주,차민석,신상훈,홍영택,오성근,이장용 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The oceans have been investigated to obtain various forms of renewable energy for decades. One of the ocean energy sources is salinity gradient energy, which is available from the change in Gibbs energy during mixing of seawater and river water. The main components of a reverse electrodialysis system are ion exchange membranes such as CEM, AEM. CEM requires low electric resistance, high permselectivity. Semi-interpenetrating network have high mechanical property and good chemical stability. In this study, cation exchange membranes based on semi-IPNs were prepared for RED application. Membrane properties, such as ion exchange capacity, water uptake, morphology, permselectivity, area resistance were measured. In conclusion, lab-made membrane showed excellent power density relatively greater than commercial CMV membrane under the same condition.
Retrospective study about the postoperative stability of zygomaticomaxillary complex fracture
양석환,조진용,심우철,김성범 대한악안면성형재건외과학회 2021 Maxillofacial Plastic Reconstructive Surgery Vol.43 No.-
Background: The aim of this study is to evaluate the postoperative stability of zygomaticomaxillary complex (ZMC)fractures according to the number of fixation sites and to investigate the direction of postoperative displacement ofthe unfixed part of the fractured segment. Methods: This study was retrospectively performed on 38 patients who were treated by open reduction andinternal fixation of ZMC fractures and were taken postoperative computed tomography (CT) between February2012 and July 2019. The patients were classified into 3 groups: 1-point fixation, 2-point fixation, 3-point fixationaccording to the number of fixations. The postoperative displacement of the fractured segment was evaluated bythe superimposition between postoperative CT and follow-up CT, and the postoperative stability according to thefixation sites was investigated through the amount of postoperative displacement. In addition, it was investigatedin which direction the location of the fractured segment was changed in the unfixed fractured segment accordingto the fixation sites. Results: The amount of postoperative displacement of the fractured segment was 0.75 ± 1.18 mm on average. In the postoperative displacement of the distal area according to the number of fixation of the fracture, there wasno statistically significant difference in the amount of displacement of the fracture (p = 0.574). As for the direction of the change in the location of the fractured segment, 12 patients among 38 patients with thechange in the location of the fractured segment were investigated, and the displacement in the medial direction (n= 11, 91.67%) was the most common in all three fixation methods. Conclusion: In patients with a ZMC fracture who were treated by open reduction and internal fixation, the numberof fixations did not make the difference in the postoperative displacement of the fracture. In addition, the fracturedsegment mainly changes in the medial direction after surgery, and this fact can be used as a reference for thereduction direction during surgery for the stable prognosis.