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International Conference on Computer Science and Information Technology (CSIT)

作者： Xian Wu Lan-fang Dong De-tang Lu University of Science and Technology of China Hefei Anhui CN Anhui Province Key Lab of Software in Computing and Communication Hefei China Institute of Engineering and Science Software University of Science and Technology Hefei China Institute of Engineering and Science Software University of Science and Technology of China Hefei China

A modified physics-based method is adopted to control the water waves, and the discretization of the governing 2D N-S equation is taken as the interaction between the variables in spaces, based on the idea of spreading though the neighboring regions. Meshing model of the water surface is based on a terrain LOD scheme called Tiled Quad-tree. With that the region of water surface can be extended unboundedly. A new controlling strategy is used, that the driving parameters of the water movement is taken separately, so it's easy to change parameters in real time while generating various water waves. Reflection and refraction of rays in water is simulated to improve the visual impression. It is shown that these methods can efficiently produce realistic movement of various water waves in real-time.

关键词： Computational modeling Navier-Stokes equations Animation Layout Automatic control Computer graphics Fluid dynamics Shape control communications technology Control system synthesis

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An immune based algorithm for Chinese network short text clustering

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Zidonghua Xuebao/ Acta Automatica Sinica 2009年第7期35卷 896-902页

作者： He, Tao Cao, Xian-Bin Tan, Hui School of Computer Science and Technology University of Science and Technology of China Hefei 230027 China Key Laboratory of Software in Computing and Communication Anhui Province Hefei 230027 China School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 China

Network short text clustering is a major technology in network content security. Since Chinese network short text is less of keywords and full of anomalous writings, the traditional text clustering method is not directly suitable for network short text clustering. This paper presents an immune network regulation based method to cluster Chinese network short texts. First, Chinese N-gram chunks are extracted and transformed to Chinese pinyin to form the feature representation to each Chinese network short text, so as to relieve these two characteristics' bad influence on the clustering performance. Then, the network short text set is constructed as a dynamic network and an immune network learning mechanism is used to learn the similarity among short texts and therefore to gain a better clustering result. Experiments show our method can get better performance in Chinese network short text clustering, compared with traditional method such as K-means. © 2009 Acta Automatica Sinica. All rights reserved.

关键词： Cluster analysis

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An Energy-Efficient TDMA MAC for Wireless Sensor Networks

An Energy-Efficient TDMA MAC for Wireless Sensor Networks

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IEEE Asia-Pacific Conference on Services computing (APSCC)

作者： Rong Gang Bai Yu Gui Qu Yang Guo Bao Hua Zhao Department of Electronic Engineering and Information Science University of Science and Technology Hefei Anhui China Department of Computer Science Anhui Province Key Laboratory of Software in Computing and Communication University of Science and Technology Hefei Anhui China

This paper proposes an energy-efficient and collision-free medium access control protocol TDMA-WSN for wireless sensor networks. The protocol is based on time division multiple access (TDMA) principle and reduces energy consumption by avoiding overhearing, collision and idle listening. Nodes in TDMA-WSN build schedules based on information about their neighborhood to determine when they can transmit to their neighbors and when they should listen to the channel or sleep. TDMA-WSN proposes a novel resolution with three-d-hop neighborhood information to avoid collision caused by the two-hop collision-free principle used in some protocols. TDMA-WSN can accelerate passing message by arranging schedule based on routing information from the upper-layer. The simulation results indicate that TDMA-WSN outperforms contention-based protocols (e.g., S-MAC) and scheduling-based protocols (e.g., NAMA) with significant energy savings.

关键词： Energy efficiency Time division multiple access Wireless sensor networks Access protocols Media Access Protocol Wireless application protocol Energy consumption Sleep Energy resolution Acceleration

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Link-weighted and distance-constrained channel assignment in single-radio wireless mesh networks

Link-weighted and distance-constrained channel assignment in...

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Conference on Local Computer Networks (LCN)

作者： Junfeng Jin Baohua Zhao Hao Zhou School of Computer Science University of Science and Technology Hefei Anhui China Province Key Laboratory of Software in Computing and Communication Hefei Anhui China School of Computer Science University of Science and Technology of China Hefei Anhui

In this work, we study a link-weighted and distance-constrained channel assignment problem in multi-channel mesh networks with stationary router nodes, such as community wireless networks. A good channel assignment is given as the one which can minimize interference of each link from its neighboring links and subsequently improve the network throughput. In response to it, we introduce an interference metric, namely, min-max i-value of an edge (MMIE), to explicitly accounts for interference among links that are at distance one. In addition, we further show that the link-weighted and distance-constrained channel assignment problem with respect to the interference metric is NP-hard in computation. This guides us to propose a new heuristic channel assignment algorithm called LD-CA algorithm. We study the performance of our algorithm by implementing it in a wireless simulation environment consisting of 25 nodes, each equipped with one 802.11 wireless card. The ns-2 simulation results show that in a multi-channel environment, the LD-CA algorithm significantly outperforms previously proposed channel assignment schemes by minimizing MMIE of all links.

关键词： Wireless mesh networks Interference Mesh networks Throughput Spread spectrum communication laboratories Computational modeling Switches Conferences Computer network management

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Capture expression-dependent AU relations for expression recognition

Capture expression-dependent AU relations for expression rec...

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IEEE International Conference on Multimedia and Expo Workshops (ICMEW)

作者： Jun Wang Shangfei Wang Mengdi Huai Chongliang Wu Zhen Gao Yue Liu Qiang Ji Key Lab of Computing and Communication Software of Anhui Province University of Science and Technology of China Hefei Anhui P.R.China University of Science and Technology of China Hefei Anhui CN Department of Electrical Rensselaer Polytechnic Institute Troy NY USA

ISBN: (纸本)9781479947164

To date, there is only limited research that explicitly exploits the relationships among Action Units and expressions for facial expression recognition. In this paper, we propose an facial expression recognition method through modeling the expression-dependent AU relations. First, the incremental association Markov blanket algorithm is adopted to select crucial action units for a certain expression. Second, a Bayesian Network (BN) is constructed to capture the relationships between a certain expression and its crucial action units. Given the learned BNs and measurements of AUs and expression, we can then perform expression recognition within the BN through a probabilistic inference. Experimental results on the CK+ and MMI databases demonstrate the effectiveness and generalization ability of our method.

关键词： Gold Markov processes Databases Training Accuracy Face recognition Bayes methods

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Scheduling Model for Cognitive Radio

Scheduling Model for Cognitive Radio

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3rd International Conference on Cognitive Radio Oriented Wireless Networks and communications (CrownCom 2008)

作者： Ping Zhu Jinglong Li Xufa Wang Department of Computer Science and Technology Anhui Province Key Laboratory of Software in Computing and Communication University of Science and Technology Hefei Anhui China Department of Computer Science and Technology University of Science and Technology of China Hefei Anhui China

ISBN: (纸本)9781424423019

The priority queue model divides CR (cognitive radio) system users into primary user and secondary user. The primary user has preemptive priority over secondary user, while the same priority level users are FIFO served. This paper models the CR system based on scheduling technology. The secondary users are further divided into different priority levels. A hybrid priority dynamic policy, which indicates primary user's preemptive priority and secondary user's nonpreemptive priority, is developed to reduce spectrum switch overhead during spectrum leasing process. Theoretical analyzing shows that hybrid priority reduces the spectrum switch overhead and the hybrid priority improvement is a non-negative mono-increasing function of priority level. Based on the proposed policy, CR scheduling model is built and CR scheduling rule is provided and proved. Experimental comparison between CR scheduling and priority queue shows that CR scheduling gets a smaller weighted staying time sum than priority queue and the improvement increases as system becomes more congested.

关键词： Cognitive radio Priority queue CR schedule

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A Lightweight OS-Level Virtualization Architecture Based on Android

A Lightweight OS-Level Virtualization Architecture Based on ...

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2017 2nd International Conference on Computer, Network Security and communication Engineering(CNSCE2017)

作者： Bo-wen LIU Nai-jie GU De-he GU School of Computer Science and Technology University of Science and Technology of China Institute of Advanced Technology University of Science and Technology of China Anhui Province Key Laboratory of Computing and Communication Software

All kinds of intelligent terminal equipment emerge in endlessly and grow explosively. Typical devices, such as smartphones and tablets, are becoming more and more popular, furthermore, intelligent equipment market share has more than that on PCs. And on mobile devices area, the demand for virtualization technology is gradually increasing. As an important branch of computer technology development, operating system level virtualization is becoming a hot spot of current research due to its low overhead and the advantages of lightweight. In this paper, based on the Android system on mobile devices, implement a prototype which can run multiple virtual system instances on only an Android OS by modifying the namespace mechanism in the Linux kernel to and expand into driver namespace mechanism. In addition, put forward a model called the active-inactive model guaranteeing the process if and only if in the active namespace to operate the device drivers, which was designed and implemented a new scheme of operating system level virtualization.

关键词： Virtualization Android Namespace

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Empirical Study of Population-Based Dynamic Constrained Multimodal Optimization Algorithms

Empirical Study of Population-Based Dynamic Constrained Mult...

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IEEE Symposium Series on Computational Intelligence (SSCI)

作者： Xin Lin Wenjian Luo Yingying Qiao Peilan Xu Tao Zhu Anhui Province Key Laboratory of Software Engineering in Computing and Communication School of Computer Science and Technology University of Science and Technology of China Hefei China School of Software Engineering University of South China Hengyang China

ISBN: (数字)9781728124858

ISBN: (纸本)9781728124865

There are many dynamic optimization problems in real-world applications. Although many variants of evolutionary algorithms and swarm intelligence have been proposed to solve such problems, little work has been conducted to address the dynamic constrained multimodal optimization problems (DCMMOPs). In DCMMOPs, there exist multiple optimal solutions corresponding to each environment that the algorithm is required to find. Sometimes, it is also necessary to identify the accepted local optima. Therefore, for each environment, the decision maker can select one from among multiple returned solutions according to his/her domain knowledge and/or preferences. The objective of this paper is to test the performance of various combinations of several population-based dynamic multimodal optimization algorithms and popular constraint handling techniques. First, the typical dynamic constrained optimization problems are slightly modified to be in the form of the dynamic constrained multimodal optimization problems. Second, four different population-based dynamic multimodal optimization algorithms, and five different constraint handling techniques, are pairwise tested in the experiments. Experimental results demonstrate that, among the candidates, DCMM-CSA-SR performs most successfully at all accuracy levels.

关键词： Heuristic algorithms Optimization Vehicle dynamics Sociology Statistics Evolutionary computation Clustering algorithms

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Extending CDFR for Overlapping Community Detection

Extending CDFR for Overlapping Community Detection

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International Conference on Data Intelligence and Security (ICDIS)

作者： Nannan Lu Wenjian Luo Li Ni Hao Jiang Weiping Ding Anhui Province Key Laboratory of Software Engineering in Computing and Communication University of Science and Technology of China Hefei China Centre for Artificial Intelligence University of Technology Sydney Broadway NSW Australia

ISBN: (纸本)9781538657638

In many real-world networks, a node often belongs to multiple communities. Therefore, overlapping community detection is an important task in social network analysis. CDFR is an efficient algorithm recently proposed for non-overlapping community detection. In this paper, CDFR is extended for overlapping community detection, and the extended algorithm is called as OCDFR. In OCDFR, CDFR is first called to obtain a non-overlapping community partition. Then, find the kth NGC (k=1, 2, 3,...) node for each node, and record the fuzzy relations between them. Based on the fuzzy relation between a node and its kth NGC, five decision methods are proposed to determine whether it can join the communities to which its kth NGC belongs. Experimental results on real-world networks and synthetic networks demonstrate that OCDFR is effective and highly competitive.

关键词： Heuristic algorithms Social network services Partitioning algorithms Clustering algorithms Nickel Complex networks Security

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Estimating properties of chaotic system based on S-NURBS resampling method

Estimating properties of chaotic system based on S-NURBS res...

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International Conference on Measurement, Information and Control (MIC)

作者： Chenxi Shao Qingqing Liu Tingting Wang Binghong Wang Anhui Province Key Laboratory of Software in Computing and Communication University of Science and Technology of China Hefei China Computer Science and Technology Department University of Science and Technology of China Hefei China

ISBN: (纸本)9781479913916

Physical properties of the chaotic system play important roles on studying the innate character and deciding the practical predictability of the dynamics. For a short piece of undersampled chaotic signals, it is very hard to abstract the physical properties of the signal source from the sequence. In this paper, we model this type of data with global S-NURBS method to reconstruct a smooth trajectory and resample the trajectory to get enough series. In this way, the problem of estimating the physical properties from small undersampled data is turned to the work of calculating the properties of the resampled time series. The new interpolation method is named as S-NURBS resampling method, and the simulation experiment demonstrates that the new method has a good performance in studying physical systems from the observed time series.

关键词： Time series analysis Interpolation Trajectory Chaos Splines (mathematics) Surface topography Surface reconstruction

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