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Semantic QoS Ontology and Semantic Service Ranking Approach for IoT services

Journal of Harbin Institute of technology(New Series) 2014年第6期21卷 102-112页

作者： Nwe Nwe Htay Win Jian-Min Bao Gang Cui Purevsuren Dalaijargal School of Computer Science and Technology Harbin Institute of Technology Key Lab of Broadband Wireless Communication and Sensor Network Technolog Jiangsu Provincial Engineering Research Center of Telecommunications and Network TechnologyMinistry of Education

Due to a rapid increase in the number of functionally equivalent web services at open and dynamic Io T service environment,Qo S has become a major discrimination factor to reflect the user's expectation and experience of using a *** are different languages and models for expressing Qo S advertisements and requirements among service providers and ***,it leads to the issues of semantic interoperability of Qo S information and semantic similarity match between a semantic description of the service being requested by the service consumer,and a formal description of the service being offered by the service *** this paper,we propose a hierarchical two-layer semantic Qo S ontology to promote the description and declaration of Qo S-based service information in detail for any domain and ***,we develop a semantic matchmaking algorithm to compare the web services according to their Qo S information and adopt analytical hierarchy process( AHP) to make decision for the ranked services depending on the Qo S *** comparison study and experimental result show that our proposed system is superior to other service ranking approaches.

关键词： IoT service environment semantic QoS ontology semantic matchmaking algorithm QoS-based service information analytical hierarchy process

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A QoS-aware routing algorithm based on ant-cluster in wireless multimedia sensor networks

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Science China(Information Sciences) 2014年第10期57卷 77-92页

作者： HUANG HaiPing CAO Xiao WANG RuChuan WEN YongGang College of Computer Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications School of Computer Engineering Nanyang Technological University

QoS-aware routing algorithm is important in wireless multimedia sensor networks. This paper formulates a generalized QoS-aware routing model on the basis of multiple routing metrics and priorities of packets. We first introduce a 2D plain-based routing algorithm IPACR which improves the standard ant colony algorithm by optimizing the initial distribution of artificial pheromone in order to accelerate the algorithm convergence rate. Then a clustering-based routing algorithm ICACR is presented which can be well applied in a large scale network. ICACR is a variation of IPACR because it can be suitable for clustering cases to satisfy the larger scale situations. Both the numerical algorithm performance analysis and simulation of IPACR and ICACR are given. The results show that ICACR outperforms IPACR in terms of both network lifetime and QoS-aware routing metrics in large scale wireless multimedia sensor networks. Moreover, the simulation based on the real video traces shows that by extending the multi-path to ICACR for different priorities of video frames better performance can be achieved.

关键词： ant colony clustering-based multi-path QoS-aware routing algorithm wireless multimedia sensor networks

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Utilization-based VM Consolidation Scheme for Power Efficiency in Cloud Data Centers

Utilization-based VM Consolidation Scheme for Power Efficien...

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International Conference on communication Workshop

作者： Qi Chen Jianxin Chen Baoyu Zheng Jingwu Cui Yi Qian Key Lab. of Broadband Wireless Commun. & Sensor Network Technol. of Minist. of Educ. Nanjing Univ. of Posts&Telecommun. Nanjing China

ISBN: (纸本)9781467363068

Cloud computing offers utility-oriented services to users, which is supported by large-scale data center. Although virtualized data centers provide high performance computing service, they also consume enormous amount of power. To solve the problem, dynamic consolidation of Virtual Machines (VMs) is considered as an efficient way to reduce power consumption and guarantee Quality of Service (QoS). Live migration is applied into the dynamic consolidation, which allows VMs to be migrated to other hosts and aims to minimize the number of hosts in data centers. However, the migration overhead is essential to be taken into account and massive migrations will lead to performance degradation and extra power consumption. In this paper, we propose a utilization-based migration algorithm (UMA) to migrate VMs to stable hosts, which efficiently reduces migration time and power consumption. Experiment results show that our UMA can reduce about 77.5%-82.4% migrations and save up to 39.3%-42.2% power consumption compared with the MinPower policy.

关键词： VMs QoS UMA

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Flexible user-centric service selection algorithm for Internet of Things services

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Journal of China Universities of Posts and Telecommunications 2014年第SUPPL. 1期21卷 64-70页

作者： Nwe, Nwe Htay Win Bao, Jian-Min Cui, Gang School of Computer Science and Technology Harbin Institute of Technology Harbin 15001 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China

In Internet of Things (IoT), the similar functional services are evolving in different quality of services (QoS) due to the widespread deployment of spatially distributed things on dynamic networks through the web. Therefore, the user involvement in service selection systems becomes a vital role to enhance the system performance by taking into account of subjective factors. This paper proposes a flexible QoS-based service selection algorithm (FQSA) which mainly targets to the users to be able to give their subjective preferences in an easy and friendly manner. The FQSA algorithm selects the services based on subjective information provided by the service consumers and objective information supported by the service providers. It adopts artificial neural network backpropagation algorithm to find the objective factors and applies similarity aggregation method to evaluate the creditability of the user subjective factors which have already been evaluated by ontological reasoning with the help of proposed QoS ontology. The comparative study and experimental results show that our FQSA algorithm is superior to other service selection approaches. © 2014 The Journal of China Universities of Posts and Telecommunications.

关键词： Neural networks

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Improved side information generation algorithm for Wyner-Ziv video coding

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The Journal of China Universities of Posts and Telecommunications 2014年第1期21卷 109-115页

作者： ZHANG Deng-yin WU Yuan-yuan WAN Ming-xiang Sci-Tech Park of Internet of Things Nanjing University of Posts and Telecommunication Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication

Side information has a significant influence on the rate-distortion（RD） performance of distributed video coding（DVC）. In the conventional motion compensated frame interpolation scheme, all blocks adopt the same side-information generation method regardless of the motion intensity inequality at different regions. In this paper, an improved method is proposed. The image blocks are classified into two modes, fast motion and slow motion, by simply computing the discrete cosine transformation（DCT） coefficients at the encoder. On the decoder, it chooses the direct interpolation and refined motion compensated interpolation correspondingly to generate side information. Experimental results show that the proposed method, without increasing the encoder complexity, can increase the average peak signal-to-noise ratio（PSNR） by up to 1~ 2 dB compared with the existing algorithm. Meanwhile, the proposed algorithm significantly improves the subjective quality of the side information.

关键词： DVC side information motion estimation motion compensation

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network traffic application type identification based on gravitational clustering

Network traffic application type identification based on gra...

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2013 International Conference on Management Innovation and Information technology, MIIT 2013

作者： Zhang, Dengyin Li, Xiuyun Liao, Jianfei Wang, Mingxiang Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications China

ISBN: (纸本)9781845649401

The application identification, which aims at classifying traffic accurately, is the basic of the analysis network traffic. Various improved clustering methods which based on k-means are widely used in the application identification of the network traffic. However, these algorithms are highly complex, and difficult to meet the real-time and high accuracy of the application requirements in traffic identification. By taking the k-means as the prototype and merging distance and density together, this paper proposes a gravitational clustering method to identify network traffic type which has resolved the localized solutions problem of the original clustering algorithm. The experiment result and analysis show that, traffic identification method based on this paper has higher recognition rate, faster convergence, and better clustering effect. © 2014 WIT Press.

关键词： Clustering algorithms

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A parallel HEVC encoder scheme based on Multi-core platform

A parallel HEVC encoder scheme based on Multi-core platform

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2015 4th National Conference on Electrical,Electronics and Computer Engineering(NCEECE 2015)

作者： Shu Jun Hu Dong Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry’s Engineering Research Center of Ubiquitous Network and Health Service System Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing University of Post and Telecommunications

ISBN: (纸本)9781510819085

In this paper, we propose a parallel HEVC encoder scheme based on multi-core platform, which provides maximized parallel scalab.lity by exploiting two-level parallelism, namely, the frame level parallelism and the CTB level parallelism. Inspired by the intra-CTB row level parallelism of WPP in HEVC, we investigate the inter-frame CTB prediction dependency to its reference CTBs, and find the inter-CTB correlation. Using this inter-correlation, we divide a frame into CTB units and create CTB-row level coding threads when their corresponding reference CTBs are availab.e. Each thread is bonded to a processing core, therefore, both intra- and inter-CTB rows can be encoded in parallel. Moreover, we introduce a priority scheduling mechanism to control the coding threads. Experiments on Tilera-Gx36 multi-core platform show that, compared with serial execution, the proposed method achieves 3.6 and 4.3 times speedup for 1080 P and 720 P video sequences, respectively.

关键词： HEVC multi-core platform parallel processing frame-level CTB-level

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Nanofabrication: Programmable Bidirectional Folding of Metallic Thin Films for 3D Chiral Optical Antennas (Adv. Mater. 19/2017)

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Advanced Materials 2017年第19期29卷

作者： Yifei Mao Yun Zheng Can Li Lin Guo Yini Pan Rui Zhu Jun Xu Weihua Zhang Wengang Wu National Key Laboratory of Science and Technology on Micro/Nano Fabrication Institute of Microelectronics Peking University Beijing 100871 P. R. China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 P. R. China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education College of Internet of Things Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210096 P. R. China Electron Microscopy Laboratory Peking University Beijing 100871 P. R. China Innovation Center for MicroNanoelectronics and Integrated System Beijing 100871 P. R. China

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Complete logic Bell-state analysis assisted with photonic Faraday rotation

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Physical Review A 2015年第4期92卷 042314-042314页

作者： Lan Zhou Yu-Bo Sheng College of Mathematics and Physics 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 Nanjing 210003 China Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China

The logic Bell-state which encodes many physical qubits in a logic qubit has great application potential in the future quantum communication field, for it is robust to the decoherence in a noisy environment. In this paper, we propose a complete logic Bell-state analysis (LBSA) with the help of the auxiliary single atoms trapped in the low-quality cavity. We construct the parity-check measurement gate based on the photonic Faraday rotation effect and complete the task combined with the Hadamard operation and single-qubit measurement. The number of physical qubits encoded in each logic qubit does not affect the analysis. We also discuss the application of this LBSA in the fields of quantum teleportation and logic-qubit entanglement swapping. Our LBSA protocol may have practical application in future long-distance quantum communication.

关键词： Quantum communication Faraday effect Qubits Decoherence (Quantum mechanics) Quantum teleportation

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Improved medical image registration based on mutual information and gradient information

Improved medical image registration based on mutual informat...

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2013 International Conference on Human Health and Medical Engineering, HHME 2013

作者： Zhang, Dengyin Tan, Liping Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781845648923

Image registration based on mutual information is widely employed in medical image processing. But this method may lead to the wrong result of registration due to the excessive local maximum points and low accuracy. As the imaging parameters of the same organs are changeless, the gray values from different images are related. Thus this paper constructed the weighted factors for the different gray pairs that represent the different registration accurate levels to improve the registration accuracy and robustness. Meanwhile, this paper introduced the difference between gradient modules which can reflect intensity of gray change on the basis of traditional gradient similarity metric function to improve accuracy. Tests prove that this new method has an improved attribute in aspects of the more obvious climaxes of parameters' curves, the finding of the extreme point, higher accuracy, and stronger robustness. © 2014 WIT Press.

关键词： Image registration

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