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Economic response models for membrane design
Kwon, Soojin,Hwang, Sungwon,Binns, Michael Elsevier 2017 Journal of membrane science Vol.544 No.-
<P><B>Abstracts</B></P> <P>Membrane processes are typically analyzed to determine the most energy efficient and cost effective configurations and operating conditions. This can be achieved through simulation and optimization to identify the optimal designs for each case. In this study, a new approach is suggested for the visual analysis and comparison of the economic performance of different membrane configurations. The new methodology generates response surfaces for each configuration that can be used to show ranges of possible solutions. These solution surfaces can then be compared to show the conditions, under which each configuration become beneficial. This is demonstrated here through a case study using hollow fiber membrane separation systems to reduce the concentrations of CO<SUB>2</SUB> in natural gas.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hollow fiber membrane system for natural gas treatment is mathematically modeled. </LI> <LI> Response surface method for economic analysis of various membrane configurations. </LI> <LI> Interaction between the ROI, CH4 recovery and membrane area ratio is proposed. </LI> <LI> Economic performance is analyzed based on membrane configurations. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jung, Sungwon,Park, Sohyeon,Choi, Woojin,Heo, Jiwoong,Kwon, Jaesung,Choi, Sunghwan,Hong, Jinkee Elsevier 2020 Journal of industrial and engineering chemistry Vol.84 No.-
<P><B>Abstract</B></P> <P>Technologies that can overcome the poor mechanical properties of the coatings with bacterial anti-adhesion effect based on super-wetting properties are still challenging. In this study, we developed a durable superhydrophilic nanocomposite coatings composed of polysaccharide matrix and organosilicate (OS) compound filler. In brief, carboxymethylcellulose (CMC) and chitosan (CS)-based multilayer films were fabricated via Layer-by-layer (LbL) assembly then crosslinking for the films was performed to improve inner stability and induce superhydrophilicity. As second step, we synthesized a biocompatible and robust organosilicate compound via sol-gel reaction and incorporate it as reinforcing filler into the superhydrophilic films. Consequently, durable hybrid superhydrophilic nanocomposites were coated on the substrate, and various chemical analysis and performance evaluations of the coatings were performed. The mechanical properties of the composite coatings were significantly improved due to the OS acting as a reinforcing filler in the multilayer films. Furthermore, the coatings exhibited excellent biocompatibility and transparency and exerted antibacterial effect based on superhydrophilic property. This study presents a practical strategy to solve the poor durability, the limitation of super-wetting coatings widely applied in various fields.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hyun-Jung Kwon,Chan-Sik Kim,Sungwon Kim,Syn Hae Yoon,Jungho Koh,Young Ki Kim,Seong-Soo Choi,Jin-Woo Shin,Doo-Hwan Kim 대한통증학회 2023 The Korean Journal of Pain Vol.36 No.3
Background: Recent attention has been directed towards fatty infiltration in the cervical extensor muscles for predicting clinical outcomes in several cervical disorders. This study aimed to investigate the potential association between fatty infiltration in the cervical multifidus and treatment response following cervical interlaminar epidural steroid injection (CIESI) in patients with cervical radicular pain. Methods: The data of patients with cervical radicular pain who received CIESIs between March 2021 and June 2022 were reviewed. A responder was defined as a patient with a numerical rating scale decrease of ≥ 50% from the baseline to three months after the procedure. The presence of fatty infiltration in the cervical multifidus was assessed, along with patient characteristics, and cervical spine disease severity. To assess cervical sarcopenia, fatty infiltration in the bilateral multifidus muscles was evaluated at the C5–C6 level using the Goutallier classification. Results: Among 275 included patients, 113 (41.1%) and 162 (58.9%) were classified as non-responders and responders, respectively. The age, severity of disc degeneration, and grade of cervical multifidus fatty degeneration were significantly lower in responders. Multivariate logistic regression analysis revealed that pre-procedural symptoms (radicular pain with neck pain, odd ratio [OR] = 0.527, P = 0.024) and high-grade cervical multifidus fatty degeneration (Goutallier grade 2.5–4, OR = 0.320, P = 0.005) were significantly associated with an unsuccessful response to CIESI. Conclusions: These results suggest high-grade cervical multifidus fatty infiltration is an independent predictor of poor response to CIESI in patients with cervical radicular pain.