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检索条件"机构=Beijing Key Laboratory for Network System Architecture and Convergence"

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Implementation of a Chinese Word Segmentation in Big Data Environment

Implementation of a Chinese Word Segmentation in Big Data En...

引用

International Conference on Intelligent Human-Machine systems and Cybernetics, IHMSC

作者： Shijie Ruan Gang He Dechen Yu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781509007691

A Chinese word segmentation is implement in big data environment in this paper. We develop a word segmentation system based on Double-Array Trie tree for dictionary and improving N-Gram algorithm for OOV words discovery. This paper also present a improving Omni-segmentation by using the feature of Double-Array Trie tree. Encapsulate this Chinese word segmentation system to an Elasticsearch plugin. Practical results show the system has a better performance compare with the existing system.

关键词： Dictionaries Indexes Big data Algorithm design and analysis Hidden Markov models Context Heuristic algorithms

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WiCloud: Innovative uses of network data on smart campus

WiCloud: Innovative uses of network data on smart campus

引用

International Conference on Computer Science & Education (ICCSE)

作者： Hongxing Li Guochu Shou Yihong Hu Zhigang Guo Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781509022199

Mobile Edge Computing (MEC) aims to provide mobile and cloud computing capabilities within the radio access network, and emphasizes the openness of the internet which can transfer the real-time radio network information into context-related services. In this article, we research the state-of-the-art technology of mobile and cloud convergence, then propose WiCloud, a MEC platform, which integrates an edge data center into wireless network to provide edge networking, proximate computing and data acquisition for innovative services. Moreover, we do a series experiment to verify the performance of WiCloud, and according to the campus scenes, we developed four kinds of applications to demonstrate the capability of the ecosystem to promote the process of Smart Campus.

关键词： Mobile communication Cloud computing Servers Mobile computing Bandwidth Virtualization Streaming media

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Relationship Analysis of network Virtual Identity Based on Spark

Relationship Analysis of Network Virtual Identity Based on S...

引用

International Conference on Intelligent Human-Machine systems and Cybernetics, IHMSC

作者： Shaowu Lan Gang He Dechen Yu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781509007691

With the development of Internet, there are massive network accounts on Internet when people tend to contact with each other by network applications. We define these network accounts as network Virtual Identities (NVIs). According to previous methods, we will propose a method based on Spark to analyze the relationships between NVIs. In order to analyze relationships and handle large-scale data, our approach will implement the parallelized overlapping community detection algorithm COPRA, based on GraphX, a graph-parallel computation framework on spark. Then we develop a strategy to divide the relationships to different strength levels.

关键词： Sparks Data mining Data processing Algorithm design and analysis Detection algorithms Social network services Telecommunications

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A cross-polarization discrimination compensation algorithm based on polarization modulation for the power amplifier energy efficiency improvement

A cross-polarization discrimination compensation algorithm b...

引用

International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Jinjin Yuan Fangfang Liu Caili Guo Chunyan Feng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781509053773

In the dual-polarized channel, the power amplifier (PA) energy efficiency is decreased by cross-polarization discrimination (XPD) effect which introduces cross power leakage and then reduces the BER performance of polarization modulation (PM). Therefore, an XPD compensation algorithm based on PM for the PA energy efficiency improvement is proposed. Firstly, the effect of energy efficiency caused by XPD is derived. Then the compensation factor is employed to compensate for the state of polarization (SOP) of the received signals based on channel state information (CSI) estimation. Moreover, the effect of the energy efficiency caused by the channel estimation error is analyzed. Finally, theoretical analyses and simulation results show that the XPD compensation algorithm can improve the PA energy efficiency effectively.

关键词： Channel estimation Algorithm design and analysis Wireless communication Nonlinear distortion Channel state information Energy consumption Receivers

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Mobile Edge Computing: Progress and Challenges

Mobile Edge Computing: Progress and Challenges

引用

IEEE International Conference on Mobile Cloud Computing, Services, and Engineering (MobileCloud)

作者： Hongxing Li Guochu Shou Yihong Hu Zhigang Guo Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

Mobile Edge Computing (MEC) provides mobile and cloud computing capabilities within the access network, and aims to unite the telco and IT at the mobile network edge. This paper presents an investigation on the progress of MEC, and proposes a platform, named WiCloud, to provide edge networking, proximate computing and data acquisition for innovative services. Furthermore, the open challenges that must be addressed before the commercial deployment of MEC are discussed.

关键词： Mobile communication Cloud computing Mobile computing Servers Wireless communication Smart phones Wireless sensor networks

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CONNECTIVITY FOR OVERLAID WIRELESS networkS WITH OUTAGE CONSTRAINTS

CONNECTIVITY FOR OVERLAID WIRELESS NETWORKS WITH OUTAGE CONS...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Yang Liu Chengzhi Li Changchuan Yin Huaiyu Dai Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China 100876

ISBN: (纸本)9781479999897

We study the connectivity of overlaid wireless networks where two users can communicate if the signal-to-interference ratio is larger than a threshold subject to an outage constraint. By using percolation theory, we first specify a 2-dimensional connectivity region defined as the set of density pairs--the density of secondary users and the density of primary users--within which the secondary network is percolated. Several interesting properties of this region are also revealed. Our work provides a new perspective for better understanding of the connectivity of large-scale overlaid networks.

关键词： CONNECTIVITY density pairs primary users

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Improving mobility prediction performance with state based prediction method when the user departs from routine

Improving mobility prediction performance with state based p...

引用

IEEE International Conference on Big Data Analysis (ICBDA)

作者： Airui Li Qiujian Lv Yuanyuan Qiao Jie Yang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications (BUPT) Beijing China

ISBN: (纸本)9781467395922

With the rapid increase of the mobile users, mobility prediction has attracted more and more attention. For the moment, a lot of location prediction methods have shown that humans are highly predictable in their movements. However, the method of predicting locations when the user's behavior unexpectedly transits from routine to irregular pattern is undiscovered. In this paper, we propose a practical model based on State Based Prediction (SBP) method to predict the place to be visited when the user departs from the routine. First, we predict the routine level of user locations to discover the irregular places. Second, we use Markov method to predict future locations. Then, when user departs from the routine, we use SBP method to conduct prediction, meanwhile the prediction results of the other places remain consistent with the output of the Markov predictor. Experiments with the real mobile dataset show that our prediction model outperforms other basic mobility predictors, for example, the accuracy of our method can reach more than 83%, which is higher than the accuracy of 60% achieved by Lempel-Ziv (LZ) predictor.

关键词： Trajectory Markov processes Predictive models Mobile communication Entropy Mobile computing systems architecture

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Detecting Malicious Domains by Massive DNS Traffic Data Analysis

Detecting Malicious Domains by Massive DNS Traffic Data Anal...

引用

International Conference on Intelligent Human-Machine systems and Cybernetics, IHMSC

作者： Shiqi Tian Cheng Fang Jun Liu Zhenming Lei Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications HAOHAN Data Technology Co. LTD. Beijing China

ISBN: (纸本)9781509007691

DNS (Domain name system) is one of the most prevalent protocols on modern networks and is essential for the correct operation of many network activities including the malicious operation. Monitoring the DNS traffic is an effective method to detect malicious activities. In this paper, we proposed an approach to detect malicious domains by analyzing massive mobile web traffic data. We used multiple features to classify, including the textual features and the traffic statistics features of domains and presented three typical classifiers to compare the classifying effect of each. Spark framework is leveraged to speed up the calculation of a large-scale DNS traffic. The efficiency of our system makes us believe the approach can help a lot in the field of network security.

关键词： Feature extraction Support vector machines Sparks Computational modeling IP networks Internet Monitoring

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Remote Video Interception system Implemented on USRP

Remote Video Interception System Implemented on USRP

引用

IEEE International Conference on Internet of Things

作者： Yuan Zhou Li Deng Weijun Hong Chen Zhang Shufang Li Zhen Wang Beijing Key Laboratory of Network System Architecture and Convergence Beijing Laboratory of Advanced Information Network Beijing University of Posts and Telecommunications Beijing China 100876

ISBN: (纸本)9781509058815

With the development of the technology, life is filled with increasing information equipment. When they work, a great deal of information will be radiated. For the leaked information, an interception system is built with USRP (Universal Software Radio Peripheral), and the line synchronization signal was extracted with a method called cepstrum. Compared with the method of autocorrelation, the new method is more conducive to find the interval between the neighboring peaks. And the system has more obvious advantages compared to the traditional system composed of AD (Analog-Digital) and DSP (Digital Signal Process) devices. It is small in size, inexpensive, reconfigurable, and it is convenient to operate. The results of experiments indicate that 16 fonts can be reconstructed clearly. It fully reflects its superior performance.

关键词： TEMPEST USRP information leakage line synchronization signal

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A fast handoff scheme for ieee 802.11 networks using software defined networking

A fast handoff scheme for ieee 802.11 networks using softwar...

引用

International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Biao Zhang Xiangming Wen Zhaoming Lu Tao Lei Xiaoguang Zhao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Beijing Laboratory of Advanced Information Network Beijing China

ISBN: (纸本)9781509053773

Due to the limited coverage range of access points (APs) and the mobility of stations (STAs), handoff occurs frequently in IEEE 802.11 wireless local area network (WLAN). However, traditional handoff mechanisms employed at STAs have inherent defects which make it hard to realize seamless handoff, it is a challenging issue for supporting seamless handoff service in WLAN. Extensions to Software Defined networking (SDN) framework for WLAN could provide new solutions to address this issue. In this paper, we propose a pre-scan based fast handoff scheme for SDN based WLAN system. The proposed scheme can help STA obtain the best alternative AP in advance after the pre-scan process, and when the handoff is actually triggered, STA can perform the authentication and reassociation process toward the alternative AP directly. Moreover, we adopt Kalman filter to minimize the fluctuation of received signal strength (RSS), thus reducing the unnecessary pre-scan processes and handoffs. Simulation results show that the proposed scheme can effectively reduce the handoff delay.

关键词： Wireless LAN Delays Probes Switches IEEE 802.11 Standard Authentication Wireless communication

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