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김주승,박민철 대한고유수용성신경근촉진법학회 2018 PNF and Movement Vol.16 No.3
Purpose: The purpose of this study was to investigate whether the respiratory function of patients with stroke was different on the ground and under water. Methods: We recruited 14 adults who had experienced a stroke (12 male, 2 female) for our study. We measured forced vital capacity, forced expiratory volume at one second, maximum inspiratory pressure, and maximum expiratory pressure when the participants breathed on the ground and under water. On the ground, the participants were safely supported using a table and chair and were measured in a standing posture. For measuring under water, the participants were immersed in water in a standing position to clavicle height. The participants were measured while standing, and the assistant supported them when they needed help. The collected data were analyzed by a paired t-test. Results: Forced vital capacity and forced expiratory volume at one second were significantly lower in water than on the ground when breathing at maximum. Maximum inspiratory pressure was not significantly different when standing on the ground or in water, but maximum expiratory pressure was significantly higher in water than on the ground. Conclusion: It has been confirmed that the hydrostatic pressure affecting stroke patients immersed in water affects the forced expiratory volume at one second while reducing the forced vital capacity and increasing the maximum expiratory pressure.
Chitosan-based biofilms for the use of bone substitutes
김주승,강경아,김현승,이민희,노형원,이우걸 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Chitosan is a naturally derived polymeric substance and has been widely applied in various industrial fields, including biomaterial engineering. In this study, we fabricated chitosan-based films combined with drug and polymer to improve their biofunctinality. The surface properties of these films, such as roughness and hydrophilicity, were characterized. The biocompatibility and cytocompatibility of these complexes were examined to proliferation and differentiation of osteoblast. Results showed that the improved cell responses.
LB법으로 첨가한 Poly(3-hexylthiophene)을 발광층으로 사용한 전계발광소자의 발광특성
김주승,이경섭,구할본 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.9
We studied emitting properties of organic electroluminescent devices fabricated using the spin-coating and Langmuir-Blodgett(LB) technique. The LB technique has the advantage of precise control of the thickness better than spin-coating method. LB monolayer of poly(3-hexylthiophene)(P3HT) was deposited 27 layers onto the indium-tin-oxide(ITO) substrate as Y-type films by the vertical dipping method. In the absorption spectra, the λ$\_$max/ of P3HT-AA LB films and of spin-coating films showed about at 510, 545 and 590 nm corresponding to 2.43, 2.28, 2.10eV. And we observed that the turn-on voltage of devices deposited by LB method(10V) was higher than that of spin-coating method(8.5V) in voltage-current-luminance characteristic. In the logV-logJ characteristics of ITO/P3HT-AA LB/Al device, we confirmed that El device fabricated by LB method follows three conduction mechanisms: ohmic, space-charge-limited current(SCLC) conduction and trapped-carrier-limited space-charge current(TCLC) conduction.
Fabrication of alendronic acid-loaded PLCL scaffolds for hard tissue repair
김주승,김응석,이정인,임진익,이우걸 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Caprolactone and L-lactide are basic materials for the preparation of various biomaterials. We synthesized poly(L-lactide-co-caprolactone) (PLCL) using these two monomers. PLCL is a biodegradable polymer and can be readily fabricated into various structures. Alendronic acid is a therapeutic agent widely used for repair of various bone-related diseases. In this study we investigated the effects of incorporation of alendronic acid in PLCL scaffold on physical and biological properties. Various analytical methods, including SEM, EDX, and FT-IR, were utilized to examine the physicochemical properties of the scaffolds. In vitro assessments were performed to analyzed the cellular responses using an osteoblastic cell-line. <sup>**</sup>This research was supported by the Ministry of Trade, Industry and Energy(MOTIE), KOREA, through the Education Program for Creative and Industrial Convergence. (Grant Number N0000717)
Improvement of biocompatibility of chitosan scaffold via biological surface modification
김주승,박창희,허송이,허송이,임진익,이우걸 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Bisophosphonate is a medicine widely used in the treatment of osteoporosis. Chitosan can be obtained by treating chitin with alkali sodium hydroxide. Chitin is the structural component of crustaceans. In this investigation, we fabricated chitosan scaffold and characterized the structural and chemical properties. The cellular morphology upon adhesion and proliferation was monitored in order to examine the effect of modifications. The improved cell viability and differentiation indicate that the current modification method can effectively up-regulate cellular responses.
Investigation on the effects alendronic acid concentration on osteoblast growth in chitosan scaffold
김주승,허송이,박창희,이종호,김지혜,이우걸 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Chitosan is a polysacchride of D-glucosamine and N-acetyl-D-glucosamine. Chitosan is obtained from deacetylated chitin which is major component of arthropod exoskeleton. Chitosan is biocompatible, easily fabricated into a desired shape, and can improve cell immunity. Alendronic acid is used as a strong inhibitor of bone resoprtion in osteoporosis and increase bone affinity toward calcium ions so that can reduce bone fracture. In this study, we investigated the effects of alendronic acid concentrations on osteoblastic responses, including proliferation and differentiation. The physicochemical properties of the prepared scaffold, i.e chemical state and hydrophilicity, were analyzed.
Immobilization of TiO2 nanoparticles on a silica glass
김주승,김범석,김대현,정인철,임진익,이우걸 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Air pollution is rapidly increasing due to extensive industrialization of our society. It is desirable to develop efficient method to treat organic pollutants. Photocatalyst such as TiO2 can be one of choice to deal with this problem. In this study, we investigated a method to prepare a monolayer of anatase TiO2 nanoparticles on silica glass using PVA as a binder. The immobilization of TiO2 nanoparticles on silica was confirmed using scanning electron microscope, energy dispersive X-ray spectroscope, Fourier transform infrared spectroscope, and goniometer. Immobilization of TiO2 nanoparticles significantly changed surface properties of silica glass.