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Enhancement of mechanical properties in graphene-metal nanocomposites
이진섭,황재원,김정모,전석우 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Graphene, two dimensional layered structure of carbon atoms is interesting in ideal reinforced nanomaterial due to their excellent mechanical properties (Monolayer graphene has a Young`s modulus of 1 TPa and a tensile strength of 130 GPa) facilitating numerous potential applications. Recently, several groups reported to graphene/polymer and graphene/metal composite resulting in enhanced mechanical properties. However, the limited control mixing process and the use of low quality graphene flake without precise reinforcement mechanism make it difficult to achieve the true mechanical properties of nano-composites. In this research, we propose a new approach by molecular-level mixing process and spark plasma sintering process to avoid the major problem of dispersion and thermal damage of graphene flakes during the synthesis of graphene/metal nano-composite. It also showed improved mechanical properties with the reinforcement effect of graphene in metal matrix nanocomposites.
이진섭,정해덕,백형래 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1
This paper describes a new digital control system based on the model state equations and a prediction method of the load current for PLW inverter with DC link. A new technique used dead beat theory to obtain a sinusoidal PWM inverter output voltage with LC filter has been presented. The dead schemes possess one sample delay in theses controlled signal which can compensate by prediction of the reference wave of the load current at next sample time. Load current prediction which has quick response is applied to compensate the random and high frequency components. This proposed control inherently is verified vary good sinusoidal output wave synthesis of voltage and current, providing accurate phase positioning for various load and excellent transient response. The experimental implementation of the system uses a real time TMS320C31 DSP(Digita1 Signal Processor)based digital controller.