Guosheng Cheng

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Neural stem cell (NSC) based therapy provides a promising approach for neural regeneration. For the success of NSC clinical application, a scaffold is required to provide three-dimensional (3D) cell growth microenvironments and appropriate synergistic cell guidance cues. Here, we report the first utilization of graphene foam, a 3D porous structure, as a(More)
In this paper, a parametrization of two-dimensional wavelet filter system is used as a method to protect wavelet-based watermarks against unauthorized detection. This system is developed in terms of a novel transformation-Shift Unitary transform (SUT) of Conjugate Quadrature filter (CQF). The commonly used wavelet filters are only special cases of this(More)
Engineered topographical manipulation, a paralleling approach with conventional biochemical cues, has recently attracted the growing interests in utilizations to control stem cell fate. In this study, effects of topological parameters, pattern and size are emphasized on the proliferation and differentiation of adult neural stem cells (ANSCs). We fabricate(More)
In this paper, we embed watermark into wavelet DC components. The DC area is not suitable for embedding watermark because of severe visual degradation. We overcome degradation problem by performing median filtering to the lowest frequency sub-band of wavelet transform, and embed watermark into visually insensitive locations. To embed a visually meaningful(More)
Based on Schnorr cryptosystem, this paper proposes a new forward-secure threshold signature scheme. It ensures that both the signature's secret key and the signature are forward-secure through efficiently hiding the current secret key in the signature phase and using the time-parameter effectively in the verification phase. This scheme has the new property(More)
Recent results from network theory show that complexity affects several dynamical properties of networks that favor synchronization. Here we show that synchronization in 2D and 3D neuronal networks is significantly different. Using dissociated hippocampal neurons we compared properties of cultures grown on a flat 2D substrates with those formed on 3D(More)