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2015 IEEE/CIC International Conference on communications in China - Workshops, CIC/ICCC 2015

作者： Guo, Yunfei Wang, Kun Liu, Shidong Guo, Jinghong Lu, Heng Smart Grid Research Institute State Grid Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing210003 China

ISBN: (纸本)9781467397018

The power communication networks is a relatively complex system with high security, which is performed in a number of ways, such as safety of power generation equipment, security of transmission and distribution lines, as well as data transmission security. The core of power communication networks security is context-aware data processing. With continuously extending in scale of the power communication networks, power communication data process become more complicated. In order to realize automatization of data processing of the power communication networks, this paper proposed a Context-aware Data Processing Model in power communication networks (CDPM). In this three-layer architecture, a Distributed Database Based on Data Categorization (DDB-DC) is designed in storage layer, which is able to choose the most efficient approach to store the context-aware data from the gathering layer according to different context-aware data types. Then, a Real-time Feature Extraction algorithm (RFE) for context-aware systems is presented in the computing layer to process the context-aware data stream. The model is a new data processing method in power communication networks. © 2015 IEEE.

关键词： Feature extraction

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Feedback free distributed video coding rate control algorithm

Feedback free distributed video coding rate control algorith...

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International Conference on Information technology and Computer Application Engineering, ITCAE 2014

作者： Zhang, Deng Yin Ma, Teng Sci-tech Park of Internet of Things Nanjing University of Posts and Telecommunication Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication Ministry of Education Nanjing China

ISBN: (纸本)9781138027176

In this paper, based on the feedback free distributed video coding system, a rate control algorithm was proposed for Wyner-Ziv frames. First, calculate the maximum correlation of coefficient band level between the source WZ frames and adjacent key frames in DCT domain, and the quantization matrix was determined based on maximum correlation and the QP of the key-frames;then, according to the generated low-complexity side information and source WZ frame with DCT transformation and quantization, allocate the bit plane rate. Experimental results show, compared with the existing rate control algorithm without feedback channel, the proposed algorithm can effectively improve the Rate-Distortion performance of the feedback free system with little additional complexity. © 2015 Taylor & Francis Group, London.

关键词： Feedback

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An all dynamic MAC protocol for wireless Body Area network

An all dynamic MAC protocol for Wireless Body Area Network

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11th International Conference on wireless communications, networking and Mobile Computing (WiCOM 2015)

作者： Jun Wang Yutian Xie Qiong Yi Key Lab of Broadband Wireless Communication and Sensor Network Technology NJUPT Nanjing Jiangsu China

ISBN: (纸本)9781510821279

wireless Body Area network (WBAN) is considered as a special type of WSN. It consists of low-power wireless sensor nodes, which are placed on or implanted in the body for continuous health monitoring. MAC protocol is responsible for conflict detection, processing, priority control, timeslot assignment, transmission order etc. So the design of MAC protocol plays an important role in the reliability and efficiency of WBAN. In order to increase the energy efficiency and reliability of WBAN, a new wireless body area network MAC protocol-AD-MAC protocol is proposed. The proposed protocol adopts dynamic priority control, dynamic timeslot allocation mechanism and dynamic length allocation mechanism of different access periods to achieve reliable transmission in the situation of low latency and low power consumption. The simulation results show that AD-MAC protocol is superior to IEEE802.15.6 MAC and CA-MAC in terms of throughput, power consumption and delay.

关键词： Energy-Efficiency IEEE802.15.6 wireless Body Area network body area networks MAC protocol Methotrexate-Actinomycin-Chlorambucil Regimen Energy efficiency wireless dynamic priority conflict detection

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An improved static B+ tree index adaptive to cloud environment for analytic application 5th

An improved static B+ tree index adaptive to cloud environme...

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5th International Conference on Environmental Science and Information Application technology, ESIAT 2014

作者： Wan, Mingxiang Ren, Chunshao Zhang, Dengyin Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication Ministry of Education Nanjing China Sci-tech Park of Internet of Things Nanjing University of Posts and Telecommunication Nanjing210003 China

ISBN: (纸本)9781138028142

B+ Tree is a special balanced multiway tree with flexible structure and node pages linking to each other. It supports not only rapid random query, but also range query. But B+ Tree index cannot be directly migrated since data storage architecture is different in cloud environment. Based on the characteristics of cloud computing master-slave architecture and combined with the characteristics of the columnar storage in the cloud environment, this paper proposes an improved secondary index of B+ Tree. In this index, primary key still uses key-Value style hash index, which can not only get high search efficiency, but also maintain load balance;other property columns will apply improved B+ Tree index, which can solve the problem of high time complexity when querying non-primary key and also support range query of non-primary key property. © 2015 Taylor & Francis Group, London.

关键词： Flexible structures

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Distributed cooperative spectrum sensing based on consensus among reliable secondary users

Distributed cooperative spectrum sensing based on consensus ...

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International Conference on wireless communications and Signal Processing, WCSP 2015

作者： Wei, Ji Haixi, Cao Zhen, Yang College of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing210003 China

ISBN: (纸本)9781467376860

Cooperative spectrum sensing (CSS) is a key technology to improve the sensing performance. Fully distributed CSS has been applied in cognitive radio ad hoc networks with good detection performance. However, when the number of secondary users (SUs) is large and the range of cognitive radio network is wide, sensing overheads (e.g., time and energy consumption) will increase correspondingly. Meanwhile, the reliability of SUs will potentially influence the detection performance. In this paper, a fully decentralized cooperative spectrum sensing scheme based on consensus theory among reliable SUs is proposed. Firstly, belief vector is used for distinguishing the reliable SUs from the unreliables. Secondly, the sub network with most reliable SUs is chose as reliable region, in which sensing information of reliable SUs can be exchanged among their one-hop neighbors with finite iterations based on consensus theory. Lastly, SUs in consensus network will get a consensus sensing outcome which will be shared with SUs outside of consensus network. The proposed scheme does not need the prior knowledge of primary user in the entire process. Simulation results show that the proposed scheme has better detection performance than traditional methods. © 2015 IEEE.

关键词： Energy utilization

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Nonorthogonal object identification based on ghost imaging

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Photonics Research 2015年第5期3卷 238-242页

作者： Xiaofan Gu Shengmei Zhao Institute of Signal Processing & Transmission Nanjing University of Posts and Telecommunications (NUPT) Key Lab of Broadband Wireless Communication and Sensor Network Technology NUPT Ministry of Education

Ghost imaging could be used to make a quick identification of orthogonal objects by means of photocurrent correlation measurements. In this paper, we extend the method to identify nonorthogonal objects. In the method, an object is illuminated by one photon from an entangled pair, and the other one is diffracted into a particular direction by a pre-established multiple-exposure hologram in the idler arm. By the correlation measurements, the nonorthogonal object in the signal arm could be discriminated within a very short time. The constraints for the identification of nonorthogonal objects are presented, which show that the nonorthogonal objects can be discriminated when the overlapping portion between any two objects is less than half of all the objects in the set. The numerical simulations further verify the result.

关键词： Nonorthogonal object identification based on ghost imaging

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The Dynamic Index Design of network Management Data on HBase

The Dynamic Index Design of Network Management Data on HBase

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2015 International Conference on Advanced Management Science and Information Engineering(AMSIE 2015)

作者： J.D.Yang C.S.Ren W.Mao D.Y.Zhang Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationMinistry of Education

Aimed at the problems that data access delay and static index structure cannot meet the demand of frequent index update in the massive network management data,a dynamic index mechanism based on HBase and a special index table is designed in this *** key value of the table is comprised of key value and indexed column which come from original data,thus enforcing the map of the indexed column with the original *** address the problems in frequently adding and deleting data,an index update algorithm is established in which only changed data is *** results show that the index structure will be adjusted as the data is adding and deleting,rustling in the optimal search *** query efficiency based on the improved method raises 4.98 times in 100 thousand rows and 55.66 times in 1 million *** more the number of the rows increases,the more search efficiency obviously improves.

关键词： network management data HBase index

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A RGB-D Face Recognition Approach without Confronting the Camera

A RGB-D Face Recognition Approach without Confronting the Ca...

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

作者： Wei Zhou Jian-xin Chen Lei Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education

Face recognition research mainly focuses on traditional 2D color images, which is extremely susceptible to be affected by external factors such as various viewpoints and has limited recognition accuracy. In order to achieve improved recognition performance, as well as the 3D face holds more abundant information than 2D, we present a 3D human face recognition algorithm using the Microsoft's Kinect. The proposed approach integrates the depth data with the RGB data to generate 3D face raw data and then extracts feature points, identifies the target via a two-level cascade classifier. Also, we build a 3D-face database including 16 individuals captured exclusively using Kinect. The experimental results indicate that the introduced algorithm can not only achieve better recognition accuracy in comparison to existing 2D and 3D face recognition algorithms when the probe face is exactly in front of Kinect sensor, but also can increase 9.3% of recognition accuracy compared to the PCA-3D algorithm when it is not confronting the camera.

关键词： 3D face recognition Kinect RGB-D images XML file classifier

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New Evaluation Model on Web Site Credibility

New Evaluation Model on Web Site Credibility

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2015 International Conference on Computer Information Systems and Industrial Applications(CISIA2015)

作者： Y.Y.Ma F.Chen Z.X.Sun Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781510805750

In view of the existing web site credibility evaluation models failing to comprehensively consider the multiple attributes of trust,after learning the D- S evidence theory and fuzzy theory,a new web site credibility evaluation model is put forward in which the trust value is divided into historical trust value and the current trust *** study shows that the model can track the change of user preferences in real-time as well as can meet the dynamic nature of universal environment,so the trust assessment is more reasonable and accurate.

关键词： evaluation model d-s evidence theor fuzzy theory

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Performance analysis of two-hop-relay cellular systems with queueing capability

Performance analysis of two-hop-relay cellular systems with ...

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2015 International Conference on Information and communications Technologies, ICT 2015

作者： Lu, Weifeng Gu, Mengmeng Yang, Luxi College of Computer Nanjing University of Posts and Telecommunications Nanjing210023 China School of Information Science and Engineering SouthEast University Nanjing210096 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing Jiangsu210023 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu210023 China

ISBN: (纸本)9781849199940

In this paper, we present a two-hop-relay WCDMA cellular system with queueing capability, where a call can wait in the incoming buffer at the congested Base Transceiver Station (BTS) if no channel is immediately available, so as to reduce the call blocking rate. We develop an analytic model based on Multidimensional Markov chains. Then based on this model, we can obtain the average transmission rate and the queuing delay performance of the system respectively. Finally, through numerical calculation, we analyze the impact of the various parameters on the performance of the two-hop-relay WCDMA cellular system with queueing capability.

关键词： Queueing theory

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