Xiaochun Cheng

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In ad hoc wireless networks, to compute the transmission power of each wireless node such that the resulting network is connected and the total energy consumption is minimized is defined as a Minimum Energy Network Connectivity (MENC) problem, which is an NP-complete problem. In this paper, we consider the approximated solutions for the MENC problem in ad(More)
We propose a new efficient identity-based broadcast encryption scheme without random oracles and prove that it achieves selective identity, chosen plaintext security. Our scheme is constructed based on bilinear Diffie-Hellman inversion assumption and it is a good efficient hybrid encryption scheme, which achieves O(1)-size ciphertexts, public parameters and(More)
BACKGROUND/PURPOSE The purpose of this work was to demonstrate the use of the nonlinear spectral imaging technique with the image-guided spectral analysis function and the extracting channels function in visualizing the extracellular maxtrix (ECM) structures and sensing fibroblasts metabolism within fresh and untreated human dermis. METHODS A Zeiss LSM(More)
This paper presents a genetic algorithm with a penalty function for the job shop scheduling problem. In the context of proposed algorithm, a clonal selection based hyper mutation and a life span extended strategy is designed. During the search process, an adaptive penalty function is designed so that the algorithm can search in both feasible and infeasible(More)
With the completion of large scale genomic sequencing, a great number of non-conding RNAs (ncRNAs) have been discovered and capture the attention of the biological sciences community. All known ncRNAs may be divided into two groups, namely: i—small ncRNAs, which comprise microRNAs (miRNAs), PIWI-interacting RNAs (piRNAs) and short interfering RNAs (siRNAs),(More)
The Mandelbrot set (M-set) formulated by fc(z) = z + c is important in chaos theory. It has been extended into generalized M set (k-M set) fc(z) = z k + c by using different exponent k. The escape time algorithm is used to draw fractals, which need preset thresholds and a maximum iteration times as input. This paper presents and proves the upper and lower(More)
The emergence of ubiquitous learning requires new methods of generating and management of learning materials. In order to meet the needs of learning resources enquiry, resources reorganization and collaborative knowledge building, it calls for a new style of learning content management system in ubiquitous environment, which is the ubiquitous learning(More)