Richard Y. M. Li

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In this paper, we propose an innovative algorithm, namely block-overlapping parity check (BOPC), that can be applied to the existing halftone image data hiding algorithms data hiding smart pair toggling (DHSPT) to achieve improvement in visual quality. The proposed algorithm utilizes the properties of block-overlapping parity check to reduce the number of(More)
In the atmosphere, volatile organic compounds such as glyoxal can partition into aqueous droplets containing significant levels of inorganic salts. Upon droplet evaporation, both the organics and inorganic ions become highly concentrated, accelerating reactions between them. To demonstrate this process, we investigated the formation of organo-nitrogen and(More)
Hierarchical carbon fibers (CFs) sheathed with radial arrays of carbon nanotubes (CNTs) are promising candidates for improving the intra- and interlaminar properties of advanced fiber-reinforced composites (e.g., graphite/epoxy) and for high-surface-area electrodes for battery and supercapacitor architectures. While CVD growth of CNTs on CFs has been(More)
We propose a ring polymer molecular dynamics method for the calculation of chemical rate constants that incorporates nonadiabatic effects by the surface-hopping approach. Two approximate ring polymer electronic Hamiltonians are formulated and the time-dependent Schrodinger equation for the electronic amplitudes is solved self-consistently with the ring(More)
Two-dimensional (2D) materials can uniquely span the physical dimensions of a surrounding composite matrix in the limit of maximum reinforcement. However, the alignment and assembly of continuous 2D components at high volume fraction remain challenging. We use a stacking and folding method to generate aligned graphene/polycarbonate composites with as many(More)
We propose a soft-decision color demosaicking algorithm with direction vector selection which effectively minimizing color artifacts. Since our interpolation uses soft decision and decision making bases on direction vectors which consists of three primary colors together with same direction, it not only maintains the direction consistency, but also(More)
We propose a novel color demosaicking algorithm using direction categorization. Each pixel is classified as vertical, horizontal or smooth before interpolation. The categorization is based on gradient change within same channel, color differences and neighbors categories, so it explores relationship between intra-and inter-color channels. Color artifacts in(More)