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IEEE International Conference on Cognitive Informatics

作者： Wei Hou Yuan Huang Kao Zhang National Computer Network and Information Security Management Center Beijing China National Digital Switching System Engineering & Technology R&D Center Zhengzhou China

ISBN: (纸本)9781467372916

research on the diffusion effect of micro-blog plays an important role in improving marketing efficiency, strengthening monitoring public opinion and accurately discovering hotspot etc. To solve the problems not taking users' differences into consideration in the previous research, this paper proposes an algorithm to predict scale and depth of retweet massages based on analysis of retweet behavior. With the combination of Lr algorithm and nine related features extracted from micro-blog users themselves, their relationships and micro-blog contents, we proposes a prediction model of retweet behavior. Based on this model, we proposes an algorithm to predict the diffusion effect, which considers the character of information spreading along users and does statistical analysis of adjacent users iteratively. Experimental results on Sina micro-blog dataset show that the algorithm has a prediction accuracy of 87.1% and 81.6% in scale and depth respectively, which indicates the model works well.

关键词： Blogs IEL

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On stochastic geometry modeling of WLAN capacity with dynamic sensitive control

On stochastic geometry modeling of WLAN capacity with dynami...

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International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt)

作者： Zhiwei Zhang Yunzhou Li Kaizhi Huang Chen Liang China National Digital Switching System Engineering and Technological R&D Center State Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information Science and Technology Beijing China Department of Electronic Engineering Tsinghua University

ISBN: (纸本)9781467366823

recently, wireless local area networks (WLANs) have become ubiquitous. In high density WLANs, interference resulting from neighbor cells is a challenging problem which would affect the network performance. To get higher throughput, it is important to improve spatial reuse of the channels. Since transmit power control (TPC) may cause asymmetric links unless carefully designed, we demonstrate that dynamic sensitive control (dSC) can be used to improve capacity in dense environment. In order to reduce the influence of inter-cell interference and achieve fairness, an adaptive dSC scheme is proposed to provide the edge users with higher clear channel assessment (CCA) threshold. The CCA adaptation strategy for access point (AP) is presented as well, and a stochastic geometry model is introduced in this paper. Coverage probability and average throughput derived based on the analytical model are used to measure the network performance. Furthermore, simulations show that the proposed dSC method can provide considerable performance improvement compared with the existing methods.

关键词： Interference Throughput Signal to noise ratio receivers Wireless networks downlink radio transmitters

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Energy efficiency analysis of energy harvesting relay-aided cooperative networks

Energy efficiency analysis of energy harvesting relay-aided ...

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International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt)

ISBN: (纸本)9781467366823

Cooperative relaying is a promising technology which can improve the energy efficiency of cellular networks. However, the relays' static power consumption may cancel out the energy saved by the deployed relays. Energy harvesting (EH) technique is introduced for relay nodes in cellular networks in order to deploy flexibility and reduce the energy charge. due to the EH property, relay nodes cannot maintain a stable energy flow and keep active with a certain probability, which would degrade the benefit from relay-aided cooperative transmission. In this paper, an analytical model is proposed to investigate the energy efficiency of cellular networks aided by EH relay nodes. Meanwhile, the closed-form expressions of coverage probabilities and mean achievable rates for different links are derived. Numerical results show that EH relays bring more improvement on energy efficiency compared with non-EH relayed transmission. The influence of the density and transmit power of stations is also given through numerical simulation.

关键词： relays Energy efficiency Power demand Interference Signal to noise ratio Energy harvesting Batteries

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An image reconstruction strategy for truncated projections of planar object in cone-beam CT

An image reconstruction strategy for truncated projections o...

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International Conference on Fuzzy systems and Knowledge discovery (FSKd)

作者： Feng Zhang Bin Yan Lei Li Xiaoqi Xi Hua Jiang Siyu Chen Jinxian Cui dan Cong Ying Tian National Digital Switching System Engineering &Technology R&D Center Zhengzhou China Troop Shenyang China Urumqi Ethnic Cadres' College Urumqi China

ISBN: (纸本)9781467376839

In the field of cone-beam computed tomography (CT), truncation artifacts caused by projection truncation will decrease the quality of reconstruction image. For planar object with large area to thickness ratio, projections are truncated at some views but not all views. reconstruction of planar object is a special problem and rarely discussed ever before. In this paper, an image reconstruction strategy based on back-projection filtration (BPF) algorithm and projection onto convex set (POCS) method for truncated projections of planar object is developed. By considering the relationship between thickness of planar object and scan orbit radius, two cases are discussed in the strategy. In the first case, PI-lines parallel to the thickness direction which are non-truncated are selected and reconstructed using the BPF algorithm. In the second case, PI-lines parallel the thickness direction with no truncations are selected and reconstructed by use of BPF method firstly. And then, with the reconstructed result as a priori knowledge in the first reconstruction, PI-lines parallel to the width direction are selected and reconstructed by use of the POCS method. The proposed strategy is validated by simulations and real experiments. results show that reconstruction image quality of our method is superior to that of the conventional FdK algorithm.

关键词： Image reconstruction Computed tomography Band-pass filters Image quality Printed circuits data models detectors

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基于OpenFlow的流分片负载均衡算法(英文)

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China Communications 2014年第12期11卷 72-82页

作者：王鹏兰巨龙陈庶樵 National Digital Switching System Engineering and Technological R&D Center(NDSC)

Today’s data center networks are designed using densely interconnected hosts in the data *** are multiple paths between source host and destination ***,how to balance traffic is key issue with the fast growth of network *** lots of load balancing methods have been proposed,the traditional approaches cannot fully satisfy the requirement of load balancing in data center *** main reason is the lack of efficient ways to obtain network traffic statistics from each network *** a solution,the OpenFlow protocol enables monitoring traffic statistics by a centralized ***,existing solutions based on OpenFlow present a difficult dilemma between load balancing and packet *** achieve a balance between load balancing and packet reordering,we propose an OpenFlow based flow slice load balancing *** introducing the idea of differentiated service,the scheme classifies Internet flows into two categories:the aggressive and the normal,and applies different splitting granularities to the two classes of *** scheme improves the performance of load balancing and also reduces the number of reordering *** the trace-driven simulations,we show that the proposed scheme gains over 50%improvement over previous schemes under the path delay estimation errors,and is a practical and efficient algorithm.

关键词： OpenFlow traffic splitting load balancing packet reordering splitting granularity

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A blind extraction method of FH signals based on improved symmetric co-occurrence matrix in HF channel

A blind extraction method of FH signals based on improved sy...

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International Conference on Vehicle and Mechanical engineering and Information Technology, VMEIT 2014

作者： Gu, Pei Wang, Bin National Digital Switching System Engineering and Technological R and D Center Zhengzhou China

ISBN: (纸本)9783038350606

To remove the noise and interference signals in the blind detection of FH signals from HF channel, this paper gives a FH signals extraction method based on the improved symmetric GLCM, by combining the time-frequency analysis with the threshold method of GLCM. Firstly, the paper defines the calculation of improved symmetric GLCM on the direction of frequency and time. Then, the noise threshold is estimated based on the noise probability in the improved GLCM of frequency and the FH signals from the improved GLCM of time can be extracted by using the noise threshold. Simulation results show that the method can extract integrated FH signals under low SNr without any prior information, and that the estimation of noise threshold is more accurate and stable. Furthermore the method is simple with a small amount of computation, which is easy to be applied in the engineering. © (2014) Trans Tech Publications, Switzerland.

关键词： Image processing

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Network View and Cognitive Mechanism for Virtual Network resource Management Based Intelligent

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Chinese Journal of Electronics 2014年第3期23卷 574-578页

作者： WU Xiaochun WU Chunming WANG Bin QIAN Yaguan LAN Julong Computer Science College Zhejiang University Institute of Network and Communication Engineering Zhejiang Gongshang University National Digital Switching System Engineering & Technology R&D Center

Network virtualization has been a particularly important driving force behind the development of NGN. Finding effective ways to control self-adapting virtual networks has become a research hot spot. This paper tries to find an efficient way in combining dynamic resource sensing with traffic character and requirements in virtual network, based on that an intelligent cognition based virtual network resources management model has been put forward. We design a network topology view by coloring network topology matrix with current resources model. We present an intelligent virtual resource management mechanism based on the proposed network topology view. Experiment results illustrate that the proposed mechanism can improve VN capacity by automatic resource adjustment, which can obtain high utilization of VN resources without increasing computational expenses.

关键词： Intelligent cognition Self-adapting Virtual network

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OpenFIow Based Flow Slice Load Balancing

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China Communications 2014年第12期11卷 72-82页

作者： WANG Peng LAN Julong CHEN Shuqiao National Digital Switching System Engineering and Technological R&D Center (NDSC) Zhengzhou He'nan 450000 China

Today's data center networks are designed using densely interconnected hosts in the data *** are multiple paths between source host and destination ***,how to balance traffic is key issue with the fast growth of network *** lots of load balancing methods have been proposed,the traditional approaches cannot fully satisfy the requirement of load balancing in data center *** main reason is the lack of efficient ways to obtain network traffic statistics from each network *** a solution,the OpenFlow protocol enables monitoring traffic statistics by a centralized ***,existing solutions based on OpenFlow present a difficult dilemma between load balancing and packet *** achieve a balance between load balancing and packet reordering,we propose an OpenFlow based flow slice load balancing *** introducing the idea of differentiated service,the scheme classifies Internet flows into two categories:the aggressive and the normal,and applies different splitting granularities to the two classes of *** scheme improves the performance of load balancing and also reduces the number of reordering *** the trace-driven simulations,we show that the proposed scheme gains over 50%improvement over previous schemes under the path delay estimation errors,and is a practical and efficient algorithm.

关键词： OpenFlow traffic splitting load balancing packet reordering splitting granularity

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City-Level Geolocation Based on routing Feature

City-Level Geolocation Based on Routing Feature

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Fan Zhao Yuhan Song Fenlin Liu Ke Ke Jingning Chen Xiangyang Luo Zhengzhou Information Science and Technology Institute China National Digital Switching System Engineering and Technological R&D Center Zhenazhou Henan China Zhengzhou Information Science and Technology Institute State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Henan China

For the problem that traditional approaches for IP geolocation based on delay measurement are difficult to apply to network with weak connectivity such as China's Internet, in this paper, we utilize its hierarchical topology and proposed an approach of City-level geolocation based on routing feature. Taking IPs with known geographical location as reference nodes, this approach extracts identifying IPs of candidate regions or cities based on decision tree learning algorithm. We match the path of the target with IPs above called identifying features, and then select the region or city whose identifying feature is contained on the target's path as geolocation result. This approach improves the average accuracy for the Internet with weak connectivity hierarchical topology to 93% vs. 73% for the previous learning-based geolocation approach.

关键词： Geology Cities and towns IP networks delays Internet Topology Network topology

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A leading routing mechanism for neighbor content store 9

A leading routing mechanism for neighbor content store

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9th International ICST Conference on Testbeds and research Infrastructures for the development of Networks and Communities, TridentCom 2014

作者： Chuan-Zhen, du Yan, Zhang Ju-Long, Lan National Digital Switching System Engineering Technological R and D Center Zhengzhou450002 China

ISBN: (纸本)9783319133256

It is very easy for the nodes in Named data Networking to ignore the neighbor nodes. To solve this issue, this paper proposes a leading routing mechanism for neighbor content store. Firstly, through building the interest clusters, the nodes are partitioned to different reigns to announce the information of content store. Secondly, the packets and the fast routing tables are designed. Finally, the best path is chosen to send the interest packets. The theoretical analysis and the simulation results show that this mechanism adequately uses the neighbor content and effectively decreases the average network delay. The server load is reduced by 30%. © Institute for Computer Sciences, Social Informatics and Telecommunications engineering 2014.

关键词： Network routing

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