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장동욱 ( Dong Wook Chang ) 대구가톨릭대학교 자연과학연구소 2012 자연과학연구논문집 Vol.10 No.1
We have studied the singlet oxygen meditated photo-oxidative degradation of amphiphilic dendrimers with oligo(phenylenevinylene) core branches and oligo(ethylene oxide) terminal chains. Due to the unique micellar aggregate structures of amphiphilic dendrimers in aqueous medium and their optimized structural features, they are highly susceptible to singlet oxygen meditated photo-oxidative degradation. Interestingly, their photo-oxidative degradation process is highly dependent on the types of additional photosensitizers. As a result, the degradation processes of amphiphilic dendrimers in aqueous medium were monitored by the UV-vis spectra as a function of the elapsed irradiation time. Furthermore the chemical and morphological changes of amphiphilic dendrimers during degradation process were also investigated by FT-IR and AFM studies
장동욱 ( Dong Wook Chang ) 대구가톨릭대학교 자연과학연구소 2013 자연과학연구논문집 Vol.11 No.1
The development of a simple preparation method for high-performance polymer gel electrolyte is an important issue for many energy-related applications such as batteries, fuel cells and solar cells. Herein, we report a versatile method to produce polymer gel electrolytes via simple thermal polymerization of vinyl monomers using radical initiator. In addition, multi walled carbon nanotubes (MWNTs) have been incorporated into 3-dimensional networks of polymer gel electrolyte as fillers. Poly (ethylene glycol dimethacrylate) based nanocomposite polymer gel electrolyte has been successfully obtained with enhanced stability and superior mechanical property. Therefore, this newly developed nanocomposite polymer gel electrolytes can be considered as good candidates for the next generation of energy related devices.
서성진(Seoung-Jin Seo),김광용(Kwang-Yong Kim),장동욱(Dong-Wook Chang) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this study, three-dimensional incompressible viscous flow analysis and optimization using response surface method are presented for the design of a jet fan. Steady, incompressible, three-dimensional Reynolds averaged Navier-Stokes equations are used as governing equations, and standard k-ε turbulence model is chosen as a turbulence model. Governing equations are discretized using finite volume method. Sweep angles and maximum thickness of blade are used as design variables for the shape optimization of the impeller in response surface method. The experimental points which are needed to construct response surface are obtained from the D-optimal design and Full Factorial design and relations between design variables and response surface are examined.