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Bayesian cognitive trust model based self-clustering algorithm for MANETs

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science china(Information sciences) 2010年第3期53卷 494-505页

作者： WANG Wei1,2,3.& ZENG GuoSun1,2,3.Department of computer science & technology, Tongji {3., Shanghai 200092, china 2Tongji Branch, National Engineering & technology Center of High Performance computer, Shanghai 200092, china 3.ey Loboratory of Embedded System and Service Computing, Ministry of Education, Shanghai 200092, china 1. Department of computer science & technology Tongji University Shanghai 200092 China2. Tongji Branch National Engineering & Technology Center of High Performance Computer Shanghai 200092 China3. Key Loboratory of Embedded System and Service Computing Ministry of Education Shanghai 200092 China

With the introduction of mobile Ad hoc networks (MANETs), nodes are able to participate in a dynamic network which lacks an underlying infrastructure. Before two nodes agree to interact, they must trust that each will satisfy the security and privacy requirements of the other. In this paper, using the cognition inspired method from the brain informatics (BI), we present a novel approach to improving the search efficiency and scalability of MANETs by clustering nodes based on cognitive trust mechanism. The trust relationship is formed by evaluating the level of trust using Bayesian statistic analysis, and clusters can be formed and maintained autonomously by nodes with only partial knowledge. Simulation experiments show that each node can form and join proper clusters, which improve the interaction performance of the entire network. The essence of the underlying reason is analyzed through the theory of complex networks, revealing great scalability of this method.

关键词： trust model MANET self-clustering Bayesian method cognitive mobile

Gray physical interference model based link scheduling algorithms

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science china(Information sciences) 2012年第6期55卷 1337-1350页

作者： SU JinZhao 1,2,CAO Jing 1,2 & WU Wei 1,2 1 State Key Laboratory of Virtual Reality and Systems,beijing 100191,china 2 School of computer {3. and Engineering,Beihang university,beijing 100191,china 1. State Key Laboratory of Virtual Reality and Systems Beijing 100191 China2. School of Computer Science and Engineering Beihang University Beijing 100191 China

To improve the concurrent data transmission capability of wireless multi-hop networks,this paper proposes adopting a gray physical interference model instead of using the threshold physical interference *** model allows non-ideal links to be involved in scheduling,under the premise of not affecting the quality of existing transmission *** addition,we design two greedy algorithms to schedule more links with SINR values located in the transition *** results show that a gray physical interference model is more accurate than a threshold physical interference one,the concurrent transmission capability of a network based on the gray physical interference model is significantly increased,and network throughput is increased by 20%.

关键词： gray physical interference model threshold physical interference model link scheduling concurrent transmission TDMA

Adaptive joint configuration optimization for collaborative inference in edge-cloud systems

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science china(Information sciences) 2024年第4期67卷 335-336页

作者： Zheming yang wen JI Zhi WANG Institute of Computing technology Chinese Academy of Sciences university of Chinese Academy of sciences Peng Cheng Laboratory Tsinghua Shenzhen International Graduate School Tsinghua University

With the rapid development of technologies such as deep learning and the Internet of Things(IoT), the deployment and application of various IoT devices are becoming increasingly widespread, resulting in the inference tasks generated increasing dramatically [1]. Many deep neural network(DNN) models are deployed on servers for performing inference tasks.

关键词： Inference engines

AutoProc: An automatic proactive replication scheme for P2P storage

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science china(Information sciences) 2011年第6期54卷 1151-1160页

作者： yang Zhi & DAI YaFei computer science Department, Peking {3., beijing 100871, china 1. computer science Department Peking University Beijing 100871 China

Due to the prevalence of peer departures, P2P storage systems need to constantly generate replicas for high durability. However, few existing systems are able to select the right replication rate that balances replication cost and durability, e.g., minimizing replication cost without threatening the durability target. In this paper, we propose a method called AutoProc to automate the replication process in P2P storage systems. AutoProc employs two key techniques to enable cost-effective replication: correctly adapting replication rate with a reliability model, and replicating objects at the right order with a reliability indicator. Extensive simulations based on the real system failure trace show that AutoProc achieves the near-optimal performance.

关键词： P2P storage churn durability fault tolerance proactive replication resource usage

Software structure evaluation based on the interaction and encapsulation of methods

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science china(Information sciences) 2012年第12期55卷 2816-2825页

作者： ZHENG QingHua 1,2,OU ZhiJiang 1,2,LIU Ting 1,yang ZiJiang 3.HOU YuQiao 1,2 & ZHENG Chao 1,2 1 MOE Key Laboratory for Intelligent Networks and Network Security,Xi'an Jiaotong university,Xian 710049,china 2 Shaanxi Key Laboratory of Satellite-terrestrial Network {3. R&D,Xi'an Jiaotong university,Xian 710049,china 3.Department of computer science,Western Michigan university,Michigan,USA 1. MOE Key Laboratory for Intelligent Networks and Network Security Xi’an Jiaotong University Xian 710049 China2. Shaanxi Key Laboratory of Satellite-terrestrial Network Technology R&D Xi’an Jiaotong University Xian 710049 China3. Department of Computer Science Western Michigan University Michigan USA

Software structure is the most important factor affecting the quality of a *** evaluation of software structure is a foundational technique for software ***,the traditional evaluation criteria,such as "high cohesion and low coupling",are no longer appropriate for the new web applications,which are designed with a hierarchical framework.A novel approach is proposed in this paper to evaluate software quality based on the interaction and encapsulation of *** particular,two criteria for high quality software,the functional and hierarchical structure,are proposed to support widely used web *** cohesion and coupling and layer matching ratios between methods within a software package are calculated to determine whether the package is well implemented in terms of functional or hierarchical *** approach enables us to quantify the quality of a software system according to the structural types of its *** were carried out on 18 versions of Struts and six open-source software *** evaluation concurs with the intuition that minor upgrades,aimed at fixing bugs and adding minor functionality quickly,reduce software quality,whereas major upgrades,which normally clean up messy code and re-construct the software,improve software quality.

关键词： software structure evaluation method interaction method encapsulation functional structure hierarchical structure

A Hybrid Genetic Algorithm for Reduct of Attributes in Decision System Based on Rough Set Theory

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Wuhan university Journal of Natural sciences 2002年第3期7卷 285-289页

作者： Dai Jian\|hua 1,2 , Li Yuan\|xiang 1,2 ,Liu Qun 3.1. State Key Laboratory of Software Engineering, Wuhan university, Wuhan 43.072, Hubei,china 2. School of computer, Wuhan university, Wuhan 43.072, Hubei, china 3. School of computer science, Wuhan university State Key Laboratory of Software Engineering Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) Wuhan university School of Computer Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) Chongqing university of Posts & Telecommunications School of Computer Science Chongqing China (GRID:grid.411587.e) (ISNI:***)

Knowledge reduction is an important issue when dealing with huge amounts of data. And it has been proved that computing the minimal reduct of decision system is NP-complete. By introducing heuristic information into genetic algorithm, we proposed a heuristic genetic algorithm. In the genetic algorithm, we constructed a new operator to maintaining the classification ability. The experiment shows that our algorithm is efficient and effective for minimal reduct, even for the special example that the simple heuristic algorithm can’t get the right result.

关键词： rough set reduction genetic algorithm heuristic algorithm

Crystallization Mechanism of Na_2O-CaO-Al_2O_3.SiO_2-F Glass Containing Cr_2O_3

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International Journal of Minerals,Metallurgy and Materials 1999年第3期13卷 214-218页

作者： Lidong Teng Fuming Wang wenchao Li(Department of inorganic Materials, Shandong Institute of Light Industry, Jinan 250100, china)(Applied science School, {3. of science and technology beijing, beijing 100083. china) Department of Inorganic Materials Shandong Institute of Light Industry Jinan 250100 China Applied science School University of Science and Technology Beijing Beijing 100083 China

The effect of Cr2O3.on the nucleation and crystallization of Na2O-CaO-Al2O3.SiO2-F- glass has been investigated by means of ESR(Electron Spin Resonance), SEM(Scanning Electron Microscope), EDS(Energy Dispersive Specrometer) and so on. computer pattern recognition is applied to optimize the heat-treatment schedules. The experimental results show that the base glass containing more than 1 .5 % (mass fraction) Cr2O3.can be nucleated internally and converted to spheroidal crystal glass materials. The spheroidal crystal consisted of fibrous wollastonite crystals radiating from a center. The residual glass phase filled in the interstices between the fibers and between the spherulites. During heat treatment process, the valence states ofchromium changed from Cr6- to Cr3., and the Cr-spinel solidsolution [CaCr2O4] precipitated followed this valence change. At the primary stage of crystallization, the Cr-spinel could act as a nucleating center on which the principal or}stalline phase β-CaSiO3.grew epitaxially.

关键词： crystallized glass Na_2O-CaO-Al_2O_3.SiO_2 Cr_2O_3 pattern recognition

Multi-spectral image fusion method based on two channels non-separable wavelets

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science in china(Series F) 2008年第12期51卷 2022-2032页

作者： LIU Bin1,2 & PENG JiaXiong3.1 School of Mathematics and computer science, Hubei university, Wuhan 43.062,{3. 2 Key Laboratory of Applied Mathematics of Hubei Province, Wuhan 43.062,{3. 3.Institute of Image Recognition and Artificial Intelligence, Huazhong university of science and technology, Wuhan 43.074,{3. 1. School of Mathematics and computer science Hubei University Wuhan 430062 China 2. Key Laboratory of Applied Mathematics of Hubei Province Wuhan 430062 China 3. Institute of Image Recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan 430074 China

A construction method of two channels non-separable wavelets filter bank which dilation matrix is [1, 1; 1,-1] and its application in the fusion of multi-spectral image are presented. Many 4×4 filter banks are designed. The multi-spectral image fusion algorithm based on this kind of wavelet is proposed. Using this filter bank, multi-resolution wavelet decomposition of the intensity of multi-spectral image and panchromatic image is performed, and the two low-frequency components of the intensity and the panchromatic image are merged by using a tradeoff parameter. The experiment results show that this method is good in the preservation of spectral quality and high spatial resolution information. Its performance in preserving spectral quality and high spatial information is better than the fusion method based on DWFT and IHS. When the parameter t is closed to 1, the fused image can obtain rich spectral information from the original MS image. The amount of computation reduced to only half of the fusion method based on four channels wavelet transform.

关键词： image fusion non-separable wavelets multi-spectral image panchromatic image

Internal Curing Using Water-releasing Material for High Strength Micro-expansive Concrete

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Journal of Wuhan university of technology(Materials science) 2009年第3期24卷 510-513页

作者：吕林女 School of science Wuhan University of Technology

Due to its low water content, it is difficult for expansive agent to have an effective expansive effect on high strength concrete to compensate its extensive shrinkage and form a certain expansion. To solve this problem, water-releasing material with water storage and releasing characteristics was incorporated into high strength micro-expansive concrete to provide internal curing, and expansive effect of expansive agent was improved. Migration of water from initially saturated water-releasing material to the surrounding hydrating cement paste was investigated. Based on a given efficient diffusion distance of water stored in water-releasing material, the mass and real water-cement ratio of cured cement paste were estimated. At the same time, the effect of internal curing of water-releasing material on the volume deformation of high strength micro-expansive concrete was investigated.

关键词： water-releasing material high strength concrete expansive internal curing