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Thai Thanh Hoang Thi,이윤기,Phuong Le Thi,박기동 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Adhesive hydrogels offer considerable potential in biomedical applications because of the excellentintegration between materials and tissues. Horseradish peroxidase (HRP)-catalyzed hydrogelation, withadvantages that include ease of handling, simplicity in material design, high biocompatibility, andprocessability, is becoming a promising candidate to be engineered as an adhesive hydrogel. This reviewsummarizes recent development of HRP-mediated hydrogelation towards the bioadhesivefield, andother applications requiring the tissue adhesion of hydrogels. From the viewpoint of adhesive hydrogeldesignation, the basic chemistry of the adhesive mechanism, combinations of interactions, and currentlycommercial bioglues are summarized. The review recapitulated the adhesive hydrogel applications, theclinical translation ability, the controlling hydrogelation kinetics, the related physicochemicalcharacteristics, cytotoxicity, and animal studies. Looking to the future, to make more substantialcontributions to the bioadhesivefield, or to various biomedical applications, higher adhesion should becontinuously improved, and greater emphasis should be placed on clinical trials.
Thai Thanh Hoang Thi,Binh D.T. Trinh,Phuong Le Thi,Dieu Linh Tran,박기동,Dai Hai Nguyen 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
Because of the toxic glutaraldehyde, the chitosan-glutaraldehyde hydrogels are seriously limited inbiomedical applications. In this study, exploiting bioactive compounds of Aloe barbadensis Miller, the chitosan/Aloe barbadensis Miller-glutaraldehyde (CS/AV-GDA) hydrogels were fabricated with 4-fold lowerglutaraldehyde concentration without compromising hydrogel characteristics. The gelation time wascontrolled from a few seconds to several hours. The elastic modulus was varied from 483 to 99940 Pa. The CS/AV-GDA hydrogels could release the natural nitrite amount from 24.0 to 89.6 lM within the firsthour for antibacterial activity, then continuously deliver a few lM every next hour for cell activities. Theantibacterial test against Escherichia coli and Staphylococcus aureus revealed that the CS/AV-GDA hydrogelscould kill the planktonic bacteria 5-fold more highly than control and prevent bacteria attachmenton hydrogel surface effectively. Although the CS/AV-GDA hydrogels consumed only 0.25% glutaraldehydeconcentration, their antibacterial capacities were comparable to chitosan-only hydrogels with 2% glutaraldehyde. For cytotoxicity tests, the CS/AV-GDA hydrogels using 0.25% glutaraldehyde concentrationinduce the human dermal fibroblasts proliferation significantly. All CS/AV-GDA hydrogels with glutaraldehydecrosslinker less than 1% showed non-cytotoxicity. As a result, the new CS/AV-GDA hydrogelsmight become an attractive candidate for medicine regeneration and tissue engineering.
Applying Model Predictive Control to SMES System in Microgrids for Eddy Current Losses Reduction
Thai-Thanh Nguyen,Hyeong-Jun Yoo,Hak-Man Kim Institute of Electrical and Electronics Engineers 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>This paper presents a model predictive control for the superconducting magnetic energy storage (MPC-based SMES) system, which can be applied to a voltage source converter and a dc/dc chopper in the SMES system together. The SMES system is implemented in a microgrid to control the constant power flow at the point of common coupling, frequency, and voltage of microgrid. The control performance of the MPC-based SMES system is compared with that of the proportional-integral (PI) control method. The harmonics involved in dc current for the superconducting coil are analyzed to estimate the reduction of the eddy current losses compared to PI technique. The efficacy of the proposed control system is verified via simulations in the MATLAB/Simulink environment.</P>
Evaluatinon of the Surface Water in Southwest Area of Vietnam
Thai Thanh Luom 한국환경영향평가학회 2009 환경영향평가 Vol.18 No.6
This study surveys the surface water environment in Southwest sea areas of Vietnam in order to evaluate the current environment. It collects and analyzes experimental results of programs, scientific subjects, and international projects relevant to ecological areas and coastlines of Kien Giang province. The methods analyzed and discussed by specialists are evaluated according to pollution coefficients established by the World Health Organization (WHO), sampling methods, and case study analyses. Comparison between the scale of pollution levels and the surface water quality in experimental areas of Long Xuyen Quadrangle shows a light-moderate pollution level. In Ca Mau Peninsula, the surface water source is only slightly polluted. Sea areas and islands are also light-moderately polluted. Computing results from water quality indices (WQI) show the level of pollution in experimental sites. Activities such as constructing infrastructures for tourism, exploiting minerals, and increasing population accelerate environmental pollution by deteriorating inherently sensitive ecosystems like corals, sea grass, mangrove swamps, and Melaleuca forests. Surveying and evaluating the present situation of surface water are fundamental solutions for environmental protection in the Southwest sea areas of Vietnam.