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On The Redesign of Continuous Approximation in Sliding Mode Control
Ming Wu,Jian-Shiang Chen 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
A redesign of continuous approximation is proposed in this article. For the redesign, a smooth saturation had been formulated by four axioms and an illustrative sine saturation that satisfied the four axioms is thus formulated and applies to a sliding mode controller. The generalized sliding mode with boundary layer can provide SMC with significantly reduced chatters but with the price of robustness. Through the redesign the robustness can be improved and chatter can be alleviated as well. Simulation results on a wheeled-vehicle have shown its efficiency further.
( Yuan-yu Tsai ),( Jian-ting Chen ),( Yin-chi Kuo ),( Chi-shiang Chan ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.9
Jung and Yoo proposed the first image interpolation-based reversible data hiding algorithm. Although their algorithm achieved superior interpolation results, the embedding capacity was insufficient. Lee and Huang proposed an improved algorithm to enhance the embedding capacity and the interpolation results. However, these algorithms present limitations to magnify the original image to any resolution and pixels in the boundary region of the magnified image are poorly manipulated. Furthermore, the capacity and the image quality can be improved further. This study modifies the pixel mapping scheme and adopts a bilinear interpolation to solve boundary artifacts. The modified reference pixel determination and an optimal pixel adjustment process can effectively enhance the embedding capacity and the image quality. The experimental results show our proposed algorithm achieves a higher embedding capacity under acceptable visual distortions, and can be applied to a magnified image at any resolution. Our proposed technique is feasible in reversible data hiding.