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检索条件"机构=Science and Technology on Commuication Information Security Control Laboratory"

共 589 条记录，以下是441-450 订阅

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A New Important-Place Identification Method

A New Important-Place Identification Method

引用

2015 IEEE International Conference on Computer and Communications(ICCC 2015)

作者： Chun-lai Ma Tao Ma Hong Shan Electronic Engineering Institute Science and Technology on Communication Information Security Control Laboratory

For the problem that the location of LBSN users was sparse because of it was updated sporadically. An important place identification method was studied by improving the clustering algorithm. Firstly, a velocity pruning algorithm was applied to remove interference points from source data. Secondly, clustering algorithm based on density peak named CFSFDP was selected. To solve the problem that it is unable to decide the cluster number with CFSFDP, an improved algorithm was presented. With a cluster center automatic choosing strategy, the algorithm searched for the ‘turning points' with the trends of cluster center weights changing. Then we could regard a set of points which weight is bigger than turning points' as cluster center. As a result, the error brought by ruling in the Decision Graph could be avoided with the strategy. Thirdly, reverse geocoding technology was applied to translate coordinate in semantic place. Check-in data of Foursquare user was set as an example in experiment, the result show that the improved algorithm had higher accuracy rate and lower computation compared to CFSFDP and DBSCAN. It also proved that the feasibility and effectiveness of the method proposed in the paper.

关键词： Velocity pruning Density based clustering Density peak Clustering center

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Profiling and Identifying Users' Activities With Network Traffic Analysis

Profiling and Identifying Users' Activities With Network Tra...

引用

2015 6th IEEE International Conference on Software Engineering and Service science(ICSESS 2015)

作者： Ma Tao Ye Chun ming Chen Juan Science and Technology on Communication Information Security Control Laboratory Army Officer Academy

Traffic identification technique is used for classification of different network protocols and applications even with detection of users' network activities. In this paper, we conduct our study on some typical users' network activities and present a traffic identification method to describe the feature about users' behaviors. We convert users' network activities information into different sequences with frame size and interarrival time just like HMM model does. Then we use latent dirichlet allocation model to extract potential characterization from these activity sequences. We use some machine learning algorithms to classify different activities in the data, and we suggest a method to evaluate the mixed activities within a sequence. Our research shows that it is possible to distinguish exact users' on-line activities without inspection to packet payloads, and users' privacy may need more protection against traffic analysis.

关键词： User Activity Traffic Identification Privacy

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Tunnel moving target detection based on local structure of image and gray scale information

Tunnel moving target detection based on local structure of i...

引用

IEEE International Conference on Intelligent Transportation Engineering (ICITE)

作者： Haiyang Yu Yawen Hu Hongyu Guo Lin Fang People's Republic of China Key Laboratory of Urban ITS Technology Optimization and Integration Ministry of Public Security Hefei China School of Transportation Science and Engineering Beihang University Beijing China Infrastructure Systems and Safety Control Beihang University Beijing China Information Industry Co. Ltd. Beijing China

ISBN: (纸本)9781467390491

Tunnel moving target detection is subject to the influence of light condition and motion blur, the traditional motion detection method based on pixel points can not be very good at segmenting moving target. To solve this problem, frame difference detection method based on local structure of image and gray level information is proposed. The local mean difference information of the image is calculated by the improved algorithm, and then the similarity measure function and the gray scale measure function are constructed. The similarity measure function effectively describes the structural features of moving objects, and reduces the influence of image background information. The gray scale function is better to highlight the contrast of the target brightness, to increase the division of the target area and the background parts, and to realize the moving target detection correctly. The experimental results show that the detection method of the fusion structure and the gray level information can effectively segment the moving object.

关键词： Image segmentation Object detection Brightness Electronic mail Motion segmentation Lighting Transportation

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On the Achievability of Interference Alignment for Three-Cell MIMO Interfering Broadcast Channel

On the Achievability of Interference Alignment for Three-Cel...

引用

2015 IEEE 16th International Conference on Communication technology(ICCT 2015)

作者： Xiaofeng Xu Caowei Wang Science and Technology on Communication Information Security Control Laboratory Beijing University of Posts and Telecommunications

Interference alignment(IA) is a promising technique to effectively mitigate interference in wireless communication *** this paper,a novel IA based scheme is proposed,which is jointed design of transmit precoding matrices and receive beam forming matrices for the three-cell multiple-input multiple-output(MIMO).Gaussian interfering broadcast channels(MIMO-IFBC) with constant channel between each node,where each base station(BS) is equipped with M antennas,each mobile station(MS) is equipped with N antennas on the cell boundary,and each BS sends d data streams to each user in its *** corresponds to a down link scenario for cellular networks,where K users with the user cooperation in each *** is also analytically shown that total 3Kd degrees of freedom(Do F)is achievable if M = N≥*** simulations demonstrate the sum-rate of our proposed scheme also out performs those of conventional techniques,especially in the high signal-to-noise ratio(SNR)regime.

关键词： Interference Alignment Degrees of Freedom Multi-User MIMO Eigenvector Solution

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Uncertain dynamic skyline queries for uncertain databases

Uncertain dynamic skyline queries for uncertain databases

引用

International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： ZhiBang Yang XiaoNiu Yang Xu Zhou Science and Technology on Communication Information Security Control Laboratory Zhejiang Jiaxing 314001 China Science and Technology on Communication Information Security Control Laboratory Zhejiang Jiaxing China College of Mathematics and Information Engineering Jiaxing University Zhejiang Jiaxing China

ISBN: (纸本)9781467376839

In this paper, we research the relationship between the probabilistic products and customer preferences, which has not been studied before. In order to find out products which can meet a customer's maximum demand, we present an uncertain dynamic skyline (UDS) query, and propose effective pruning strategies to reduce the search space of the UDS query processing. In addition, effective algorithms are presented by integrating the proposed pruning strategies. Extensive experiments illustrate the efficiency and effectiveness of our proposed algorithms with a variety of experiments settings.

关键词： Probabilistic logic Vehicle dynamics Heuristic algorithms Vehicles Databases information security Context

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Research and Software Realization of Broadband Multi-channel and Multi-rate Signal Demodulation

Research and Software Realization of Broadband Multi-channel...

引用

2015 IEEE 16th International Conference on Communication technology(ICCT 2015)

作者： Wei Shi Jinfang Meng Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of CETC

Demodulation of multi-channel and multi-rate broadband signal is an important technology in digital communication and reconnaissance processing. Based on the design concept of software radio, after the study of symbol synchronization and carrier synchronization technology in demodulation process, this paper proposed a automatic demodulation scheme of multi-channel and multi-rate broadband signal. According to the AltiVec technology, the CACHE technology, the accelerating optimization softwarein of multi-core collaborative stream processing, this demodulation algorithm is realized on the digital processing platform of T4240 multicore processors. Finally QPSK signal is taken as an example to complete the experiment and result *** results show that the performance of demodulation algorithm is higher, and the method of multi-channel and multi-rate broadband signal demodulation in software way has the advantages that the software is easier to implement, the algorithm is easier to upgrade and maintain, the parameters of demodulation signal are more easily to be configurated. According to optimizing processing, the real-time processing ability of the algorithm is stronger, and it can meet the demodulation performance requirements of more channel and wider broadband signal.

关键词： Symbol synchronization Carrier synchronization Software radio T4240 AltiVec

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A Compact Complex-valued MIMO Detector and its FPGA Implementation

A Compact Complex-valued MIMO Detector and its FPGA Implemen...

引用

2015 IEEE 16th International Conference on Communication technology(ICCT 2015)

作者： Yu Han Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of CETC

This paper presents a compact and efficient hard output MIMO detection and its FPGA implementation. Our method is based on a complex-valued decomposition and a highly compact expansion, which needs least number of visited nodes and a half of tree depth than previously published K-best designs. We propose a fully pipelined architecture,combining with resource sharing to realize the ***, our complex-valued MIMO detector is implemented and validated on a Xilinx FPGA device for a 16-QAM modulation and 4×4 antenna *** implementation results show that the proposed detector is hardware efficient and has a 395 Mbps throughput with about 0.2dB performance loss.

关键词： MIMO Hard detection FPGA implementation Pipelined architecture

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Study on Network Topology Evolution Model and Strategies in Hostility Surroundings

Study on Network Topology Evolution Model and Strategies in ...

引用

2015 IEEE 16th International Conference on Communication technology(ICCT 2015)

作者： Hong-wa Yang Min Wang Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of CETC

Multi-hop wireless network is one of the most important military communication networks. In hostility environment, the network topology evolution is driven by both attacker and defender. In order to reveal the law of network topology evolution, the network architecture is analyzed at first. Secondly, the network mathematic model and dynamic topology evolution model are established. After that the validity evaluation rules of network topology are proposed. Finally, some offensive and defensive strategies are given. The proposed model and strategies can be used in both network attack and defending.

关键词： Multi-hop wireless network Topology evolution model Network attack and defend strategies

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A Kind of Better Adjacent Channel Suppression Multiple Frequency Shift Keying Signal Simulation Method Based on MATLAB

A Kind of Better Adjacent Channel Suppression Multiple Frequ...

引用

2015 IEEE 16th International Conference on Communication technology(ICCT 2015)

作者： Huan Li Wenhua Ye No.36 Research Institute of CETC Science Technology on Communication Information Security Control Laboratory

Frequency shift keying（FSK） modulation function in MATLAB without filter function, leading to poor adjacent channel suppression, which causes aliasing after a non-linear device easily. Based on FSK modulation signal generation principle, designing a better adjacent channel suppression function in this paper, which verified by demodulating through Agilent’s vector signal analyzer（89600S）, this function gets achieved more satisfactory results in the application of semi physical simulation.

关键词： Frequency shift keying（FSK） Modulation Adjacent channel suppression

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A new important-place identification method

A new important-place identification method

引用

International Conference on Computer and Communications (ICCC)

作者： Chun-lai Ma Tao Ma Hong Shan Electronic Engineering Institute Hefei China Science and Technology on Communication Information Security Control Laboratory Hefei China

ISBN: (纸本)9781467381277

For the problem that the location of LBSN users was sparse because of it was updated sporadically. An important place identification method was studied by improving the clustering algorithm. Firstly, a velocity pruning algorithm was applied to remove interference points from source data. Secondly, clustering algorithm based on density peak named CFSFDP was selected. To solve the problem that it is unable to decide the cluster number with CFSFDP, an improved algorithm was presented. With a cluster center automatic choosing strategy, the algorithm searched for the `turning points' with the trends of cluster center weights changing. Then we could regard a set of points which weight is bigger than turning points' as cluster center. As a result, the error brought by ruling in the Decision Graph could be avoided with the strategy. Thirdly, reverse geocoding technology was applied to translate coordinate in semantic place. Check-in data of Foursquare user was set as an example in experiment, the result show that the improved algorithm had higher accuracy rate and lower computation compared to CFSFDP and DBSCAN. It also proved that the feasibility and effectiveness of the method proposed in the paper.

关键词： Clustering algorithms Algorithm design and analysis Turning Market research Social network services Global Positioning System Target tracking

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