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Liu D.,China Academy of Information and Communications Technology | Zhou X.,China Academy of Information and Communications Technology | Ai B.,Beijing Jiaotong University | Guan K.,Beijing Jiaotong University | Li N.,Zhongxing Telecommunication Equipment Corporation
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2016

Aging of the in-vitro red blood cell (RBC) is a topic with great clinical interests. The gap for its clinical application was the lack of the efficient and effective method to obtain the massive flickering data from the microscopic frames. A new image processing method was developed to extract the grayscale intensity variation of the RBCs from different frames. By the method, the cell segmentation could be performed on one image. Scale-invariant feature transformation was used to remove the perturbed cells. The flickering complexity of the RBCs from 25 young adults (200 cells for each) was analyzed by multi-scale sample entropy. Meanwhile, adenosine triphosphate (ATP) concentration was measured. The results showed that the proposed image processing method was reliable and efficient to extract the flickering intensity of the RBCs. The aging process of the stored RBCs could be detected using the complexity analysis of the membrane flickering, which was much sensitive than ATP measurement. © 2016, Journal Northern Jiaotong University. All right reserved.

Lu J.,Harbin Engineering University | Li J.-J.,Zhongxing Telecommunication Equipment Corporation | Wang C.-C.,Harbin Engineering University | Xia G.-H.,Harbin Engineering University
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2015

For complex wrapped phase image, phase usually changes drastically and phase unwrapping computing is very time-consuming. In this paper, a fast and accurate unwrapping algorithm is designed to solve these problems. Firstly, the wrapped phase image is obtained through the three-step phase shift method. The quality map is calculated according to the wrapped phase. Then, the horizontal and vertical weight edges are constructed by using two neighboring pixels' quality value. The phase unwrapping path is guided by weight value of constructed edges. The unwrapping procedure uses two pixels as a unit. All the pixels are unwrapped successively by using a discontinuous path. The proposed algorithm in this paper can reduce the influence of region discontinuities, measurement occlusion and ambient noise on unwrapping accuracy effectively. Only by sorting all edges once, the order of phase unwrapping can be determined. So the efficiency of unwrapping phase is improved significantly. We also make further optimization on the unwrapping algorithm according to the characteristics of constructed weight graph. By this way, the redundant edges are removed. It can rapidly speed up the unwrapping process. Through the comparison of experiment results with other algorithms, it indicates that the proposed algorithm is faster and more accurate. ©, 2015, Board of Optronics Lasers. All right reserved.

Wang Y.,Shandong University of Science and Technology | Sun Y.-Q.,Shandong University of Science and Technology | Gao R.-R.,Zhongxing Telecommunication Equipment Corporation
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2012

Delegation is an assignment of authority and responsibility between persons for sharing resources and working collaboratively. Many models and solutions have been proposed with respect to delegation permanence, monotonicity, levels, granularity, and revocation etc. However, the important aspect of delegation agreement is less discussed which aims at carrying out delegation with consideration of the intention of both delegator and delegatee rather than the currently considering delegator only. In this paper, we propose delegation intention logic that is expressive, fine-grained and inferential in specifying the intentions of both sides and system security constraints. With the help of fuzzy logic, the proposed intention algorithm finds the most appropriate candidates for a delegation intention. Some experiments are performed to verify our method, as well as the implementation architecture is provided.

Fu W.-H.,Xidian University | Shi F.,Zhongxing Telecommunication Equipment Corporation | Liu N.-A.,Xidian University
Dianzi Keji Daxue Xuebao/Journal of the University of Electronic Science and Technology of China | Year: 2012

Aiming at the problem of blind source separation (BSS) in time varying channel, two real time BSS algorithms are presented: equivariant adaptive source separation via independence (EASI) BSS algorithm based on optimal selective function (EASI-function) and BSS based on optimal selective function algorithm with variable step-size based on kurtosis (EASI-function-KVS). EASI-function algorithm adopts the different estimate function in different stage to get the balance between divergence speed and steady-state performance. And the EASI-function-KVS algorithm changes the step-size adaptively based on kurtosis thought so as to improve the performance of algorithm. Simulation results show that the algorithms in the paper can trace the channel changes effectively and the performance is superior to that of conventional EASI algorithm.

Duan H.,University of Electronic Science and Technology of China | Zhan W.,University of Electronic Science and Technology of China | Min G.,University of Exeter | Guo H.,University of Electronic Science and Technology of China | Luo S.,Zhongxing Telecommunication Equipment Corporation
Concurrency Computation | Year: 2015

Summary With the rapid development of intelligent transportation technology, high-definition data storage, and processing of massive amounts of video surveillance have become key issues. When thousands of high-bit-rate video streaming concurrently writes, disk I/O throughput becomes a bottleneck. In addition, this leads to serious energy consumption and disk abrasion. To solve these problems, a new distributed file system for high concurrent and high-bit-rate writing is designed. It combines an optimized data storage model, efficient metadata management, and exquisite disk schedule mechanism. The optimized data storage model uses a file pre-allocation strategy and multiple-stream input modulating technology to convert the randomly concurrent writes on the disk into sequential writes; the metadata management provides an efficient means of retrieving the specified data; and the dual-partition schedule mechanism can ensure the disk stability with less abrasion. Through this distributed file system, the disk I/O throughput can be saturated in a high concurrent writing environment. The performance evaluation results demonstrate that the I/O throughput of a normal 7200RPM SATA III disk in our scheme can be stabilized at 150MB/s, easily to support 300 concurrent high-definition video streams (4Mbit/s each). The distributed file system with eight commodity servers can afford the ability of supporting 8000 high-definition video streams concurrently writing, which is far greater than the existing video surveillance storage solutions. © 2015 John Wiley & Sons, Ltd.

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