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A General Framework for Intelligent IoT Data Acquisition and Sharing in an Untrusted Environment Based on Blockchain

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China communications 2024年第3期21卷 137-148页

作者： Lu Yin Xue Yongtao Li Qingyuan Wu Luocheng Li Taosen Yang Peipei Zhu Hongbo College of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of EducationNanjing 210003China Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China Research Institute of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing 210003China Bell Honors School Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Automation Nanjing University of Posts and TelecommunicationsNanjing 210023China

Traditional Io T systems suffer from high equipment management costs and difficulty in trustworthy data sharing caused by *** provides a feasible research direction to solve these problems. The main challenge at this stage is to integrate the blockchain from the resourceconstrained Io T devices and ensure the data of Io T system is credible. We provide a general framework for intelligent Io T data acquisition and sharing in an untrusted environment based on the blockchain, where gateways become Oracles. A distributed Oracle network based on Byzantine Fault Tolerant algorithm is used to provide trusted data for the blockchain to make intelligent Io T data trustworthy. An aggregation contract is deployed to collect data from various Oracle and share the credible data to all on-chain users. We also propose a gateway data aggregation scheme based on the REST API event publishing/subscribing mechanism which uses SQL to achieve flexible data aggregation. The experimental results show that the proposed scheme can alleviate the problem of limited performance of Io T equipment, make data reliable, and meet the diverse data needs on the chain.

关键词： blockchain data sharing Internet of Things Oracle

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A Coverage Control Algorithm Based on Probability Model for Three-Dimensional wireless sensor networks

A Coverage Control Algorithm Based on Probability Model for ...

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The Eleventh International Symposium on Distributed Computing and Applications to Business,Engineering and Science(DCABES2012)(第十一届分布式计算及其应用国际学术研讨会)(原名:电子商务、工程及科学领域的分布式计算和应用国际学术研讨会)

作者： Junqing Zhang Ruchuan Wang Yisheng Qian Qianyi Wang College of Computer Nanjing University of Posts and TelecommunicationsNanjing Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationChina

The main study of traditional probability coverage problem in wireless sensor networks(WSNs)is aiming at twodimensional space,however,most practical applications of wireless sensor network is placed in a three-dimensional sensor ***,probability model is introduced for three-dimensional *** paper presents a method that using Voronoi divide to control the Scheduling of the probability model nodes in the target ***,a coverage control algorithm based on probability model(PMCCA)is *** verify the effectiveness and the practice of PMCCA algorithm by comparing PMCCA algorithm to another algorithm in simulation experiment.

关键词： wireless sensor networks three-dimensional coverage probability model Voronoi divide

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Energy efficient subchannel pairing for buffer-aided multi-relay MIMO-OFDM networks

Energy efficient subchannel pairing for buffer-aided multi-r...

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Shuang Yang Yueming Cai Junquan Hu Wendong Yang Lei Wang Weiwei Yang College of Communications Engineering PLA University of Science and Technology Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education

ISBN: (纸本)9781467376884

In this paper, we consider the buffer-aided multi-relay MIMO-OFDM networks and propose a joint space-time-frequency subchannel pairing scheme, in which subchannels of the source to relay links and relay to the destination links are paired in time, frequency, and space domain (TPFPSP) simultaneously. TPFPSP scheme can increase the equivalent channel gains between source and destination. We derive new expressions for the energy efficiency, the system capacity and the outage probability to examine the performance of TPFPSP scheme. Our analytical and numerical results outline that this TPFPSP scheme brings higher capacity, energy efficiency and better outage probability performance to our system. This work reported here provides detailed insights into the design of new subchannel pairing scheme, which achieves full diversity in space, time and frequency domains.

关键词： Relays MIMO Fading OFDM Eigenvalues and eigenfunctions Energy efficiency wireless communication

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A siamese network tracking algorithm based on hierarchical attention mechanism

A siamese network tracking algorithm based on hierarchical a...

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2020 International Symposium on Automation, Information and Computing, ISAIC 2020

作者： Zhang, Hu Hu, Dong Qiu, Yingcan Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing210003 China Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing210003 China Education Ministry’s Engineering Research Center of Ubiquitous Network and Heath Service Nanjing210003 China Nanjing University of Posts and Telecommunications Nanjing210003 China

A siamese network tracking algorithm based on hierarchical attention mechanism is proposed in this paper. In order to obtain more robust target tracking results, different layer features are fused effectively. In the process of extracting features, attention mechanism is used to recalibrate the feature map, and AdaBoost algorithm is used to weight the target feature map, which improves the reliability of the response map. Besides, the Inception module is also introduced which not only increases the width of the network and the adaptability of the siamese network to the scale, but also reduces the parameters and improves the speed of network training. Experimental results show that this method can effectively solve the impact of background clutter and improve the accuracy of tracking. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Target tracking

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An improved packet sending algorithm based on LTP in Delay Tolerant networks

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Journal of Computational Information Systems 2014年第12期10卷 5279-5286页

作者： Liu, Yan Wang, Kun Xu, Lili Yu, Yue Ouyang, Zhiyou College of Automation and Electrical Engineering Nanjing University of Technology Nanjing 210009 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

In DTN (Delay Tolerant networks), bundle and block shred data to cope with frequent interruption. However, it remains a problem of what impact will be generated on transmission efficiency by the size of bundle and block as well as how to achieve maximum efficiency by adjusting Bundle and block size in terms of environment. This paper focuses on Bundle and LTP (Licklider Transmission Protocol) in transmission layer of DTN and the impact of block size on transmission efficiency. Then a packet sending algorithm is proposed that dynamically varies its strategy to achieve the best transmission efficiency. Finally, simulation results illustrate the advantages of our proposed scheme. Meanwhile, selecting optimum size of block in proposed algorithm can increase the transmission efficiency. 1553-9105/Copyright © 2014 Binary Information Press.

关键词： Delay tolerant networks

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Evaluation for IPTV service based on poor-quality model

Evaluation for IPTV service based on poor-quality model

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International Symposium on wireless Personal Multimedia communications (WPMC)

作者： Rui Li Zhifeng Wu Ruochen Huang Xin Wei Yi Qian ZTE CORPORATION China Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education China

ISBN: (纸本)9781509053773

This paper proposes an integrated poor-quality model to find the potential relationship between elected STB (set-top boxes) indicators and network conditions. The target is to make the IPTV network fault diagnosis more accurately and efficiently, especially for the sudden pause or blurred screen. The integrated poor-quality model consists of indicator, record and user model. Firstly, the poor-quality indicator model is in charge of selecting the effective indexes from candidate STB indicators. From the result of experiment, we conclude that jitter, abend-number and MLR (media loss rate) are the most important QoS (Quality of Service) parameters in our scenario. Secondly, the poor-quality record model has responsibility for adjustment of threshold values in order to meet the needs of higher accuracy rate with lower misjudgment ratio. Finally, the poor-quality user model takes customer's viewing time parameter into account, which can reflect end user's quality of experience objectively.

关键词： IPTV Quality of service Correlation Jitter Indexes Multimedia communication

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Virtual network embedding by node-splitting

Virtual network embedding by node-splitting

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2013 15th IEEE International Conference on communication technology

作者： Jiandong Huang Qian Wu Yu Liu Bing Wang Wennai Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education College of Telecommunication & Information Engineering Nanjing University of Posts and Telecommunications

network virtualization,as a fundamental technology of Future Internet Architecture,has been used to overcome the ossification of the current *** paper focuses on virtual nodes splitting for aggregating the diverse physical resources in the issue of virtual network embedding(VNE),which is used for the resource allocation in network virtualization.A mixed integer programming(MIP) problem has been proposed by taking both path-splitting and node-splitting into *** feasibility of virtual node splitting is analyzed and a corresponding formal expression is *** VNE performance is evaluated using by a generic MIP solver over a NSFNET *** numerical evaluations in this paper show that,comparing with the approaches for VNE without node-splitting,the proposed algorithm is beneficial to reduce VNE cost,as well as to increase VN acceptance ratio.

关键词： network virtualization Virtual network mapping Node splitting Performance simulation Acceptance ratio

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Trustworthy web services discovery via supervised services representation and collab.rative QoS prediction

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Journal of Computational Information Systems 2012年第21期8卷 8835-8846页

作者： Chen, Lei Yang, Geng Zhang, Yingzhou Wang, Tao Mou, Bolin College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China

With the exponential growth of web services, the researches on how to accurately find the trustworthy services become increasingly important. Currently, some researchers have utilized the idea of services classification to minimize the services discovery duration, but seldom employed category lab.l information to further improve services representation. In addition, the existing researches always assume that the nonfunctional QoS characteristics are known, which is actually impossible in reality. In this paper, in order to address these problems, we present a trustworthy web services discovery framework named *** with the existing approaches, the TWSDisC has the two advantages. First, by using the prior category lab.l information, the TWSDisC imports the supervised Inverse Category Frequency term weighting scheme to facilitate services representation. Second, the TWSDisC adopts the state-of-the-art matrix completion technique to predict the missing QoS values and correct the corrupted ones. Experimental results performed on the real-world web services collection demonstrate the feasibility of the proposed approaches. © 2012 Binary Information Press.

关键词： Websites

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3D shape segmentation via shape fully convolutional networks

arXiv

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arXiv 2017年

作者： Wang, Pengyu Gan, Yuan Shui, Panpan Yu, Fenggen Zhang, Yan Chen, Songle Sun, Zhengxing State Key Lab for Novel Software Technology Nanjing University Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications

We design a novel fully convolutional network architecture for shapes, denoted by Shape Fully Convolutional networks (SFCN). 3D shapes are represented as graph structures in the SFCN architecture, based on novel graph convolution and pooling operations, which are similar to convolution and pooling operations used on images. Meanwhile, to build our SFCN architecture in the original image segmentation fully convolutional network (FCN) architecture, we also design and implement a generating operation with bridging function. This ensures that the convolution and pooling operation we have designed can be successfully applied in the original FCN architecture. In this paper, we also present a new shape segmentation approach based on SFCN. Furthermore, we allow more general and challenging input, such as mixed datasets of different categories of shapes which can prove the ability of our generalisation. In our approach, SFCNs are trained triangles-to-triangles by using three low-level geometric features as input. Finally, the feature voting-based multi-lab.l graph cuts is adopted to optimise the segmentation results obtained by SFCN prediction. The experiment results show that our method can effectively learn and predict mixed shape datasets of either similar or different characteristics, and achieve excellent segmentation results. . Copyright © 2017, The Authors. All rights reserved.

关键词： network architecture

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Spectrum sensing for cognitive OFDM system using free probability theory

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Journal of Information and Computational Science 2011年第10期8卷 1847-1859页

作者： Wang, Lei Zheng, Baoyu Cui, Jingwu Meng, Qingmin Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education China

Free probability theory as a main branch of random matrix theory is a valuable tool for describing the asymptotic behavior of multiple systems, especially for those with large random matrices. In this paper, by using free probability theory, a new spectrum sensing scheme for cognitive OFDM system is proposed, which shows how asymptotic free behavior of random matrices and the property of Wishart distribution can be used to assist spectrum sensing for cognitive radios in such scenario. Simulation results show that the proposed scheme has a better detection performance than the energy detection technique and the maximum-minimum eigenvalue scheme even for the case of a small sample of observations. © 2011 by Binary Information Press.

关键词： Cognitive radio

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