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International Conference on wireless communications and Signal Processing (WCSP)

作者： Peiqing Bai Ziguan Cui Zongliang Gan Guijin Tang Feng Liu Image Processing & Image Communication Lab Nanjing University of Posts & Telecommunications Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts & Telecommunications Nanjing China State Key Laboratory for Novel Software Technology Nanjing University Nanjing China

ISBN: (纸本)9781509028610

Visually salient object or region detection in images is an active research field in recent years. Inspired by that curvelets can provide multi-scale sparse representation of objects with edges and textures, in this paper, we propose a novel saliency detection model based on fast discrete curvelet transform (SDCT) to detect more compact salient objects in an image. First, fast discrete curvelet transform is used to acquire multi-scale representation of feature maps in CIElab.color space. Then the feature maps are transformed to feature salient maps based on dissimilarity measure between patches in a global manner. Finally, the complementary feature salient maps at each scale and each color channel are merged linearly to obtain unitary saliency map. Experimental results on MSRA saliency benchmark database show that the proposed SDCT model outperforms the most state-of-the-art saliency detection models in spatial and frequency domain with higher overall performance, especially acquires more compact salient object and suppresses background saliency effectively, which is desirable for many computer vision applications.

关键词： Transforms Feature extraction Image color analysis Frequency-domain analysis Computational modeling Visualization Image edge detection

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An improved flooding protocol based on network coding

An improved flooding protocol based on network coding

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

作者： Zhang, Li Na Zhang, Deng Yin Ji, Ying Tian Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China

ISBN: (纸本)9781138027176

network coding allows network node to process data by the traditional method of data forwarding, which can effectively improve network throughput, robustness and reliability. In this paper, we propose an improved flooding protocol NCFD (network coding of flooding), which combines network coding technology with flooding protocol, adopting linear network coding technology based on multipath propagation. Computer simulation results show that NCFD could significantly reduce network energy consumption and data redundancy. © 2015 Taylor & Francis Group, London.

关键词： network coding

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Direct measurement of the concurrence for two-qubit electron spin entangled pure state based on charge detection

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Chinese Physics B 2015年第7期24卷 125-129页

作者：刘炯周澜盛宇波 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications College of Mathematics and Physics Nanjing University of Posts and Telecommunications

We propose a protocol for directly measuring the concurrence of a two-qubit electronic pure entangled state. To complete this task, we first design a parity-check measurement（PCM） which is constructed by two polarization beam splitters（PBSs） and a charge detector. By using the PCM for three rounds, we can achieve the concurrence by calculating the total probability of picking up the odd parity states from the initial states. Since the conduction electron may be a good candidate for the realization of quantum computation, this protocol may be useful in future solid quantum computation.

关键词： quantum computation parity check measurement entanglement

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Fast multi-copy entanglement purification with linear optics

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Chinese Physics B 2015年第12期24卷 232-237页

作者：蔡春周澜盛宇波 Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and Telecommunications Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications College of Mathematics and Physics Nanjing University of Posts and Telecommunications

We describe an entanglement purification protocol for a polarization Bell state. Different from the previous protocols,it does not require the controlled-not gate, and only uses linear optical elements to complete the task. This protocol requires multi-copy degraded mixed states, which can make this protocol obtain a high fidelity in one purification step. It can also be extended to purify the multi-photon Greenberger–Horne–Zeilinger（GHZ） state. This protocol may be useful in future long-distance communication.

关键词： quantum computation entanglement purification entanglement

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Channel measurement and modeling for the 15-GHz radio band in an indoor corridor environment

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Journal of communications and Information networks 2016年第2期1卷 102-108页

作者： XU Hui ZHANG Wuxiong YANG Yang Key Lab of Wireless Sensor Network and Communication Chinese Academy of SciencesShanghai 200050China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Shanghai Research Center for Wireless Communications Shanghai 201210China

Traditional mobile communication systems mainly work on the licensed frequency band near or below 3 GHz;however,this band is becoming increasingly *** the other hand,there are abundant unlicensed spectrum resources in higher frequency bands,e.g.,6 GHz,15 GHz,and 28 GHz,and if those bands are applied,the current spectrum shortage problem could be effectively ***,the wireless channel characteristics and models are important but still unknown,and thus in this study,extensive measurements and modeling have been conducted to study the characteristics of the high-frequency 15-GHz ***,a PN(Pseudo Noise)sequence based time-domain measurement system was built and applied to measure the propagation characteristics of the LOS(Line-of-Sight)and NLOS(Non-Line-of-Sight)scenarios in an indoor corridor at 15 ***,in-depth analysis and modeling on the large-scale characteristics of wireless channels,the relationship between distance and path loss,the path loss exponent,and the shadow fading standard variance are ***,the relationship between received power and different elevation angles was *** the measurement,two 25-dBi horn antennas with a 10 half-power beam width are used to change elevation angles in the transmitting terminal and azimuth angles in the receiving terminal for all measurement *** findings and results in this work will serve as a reference and basis for future theoretical studies of the 15-GHz band.

关键词： 5G mobile network 15 GHz high frequency channel measurement channel modeling

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Invisible cloak fails: CSI-based passive human detection 1

Invisible cloak fails: CSI-based passive human detection

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1st ACM Workshop on Context Sensing and Activity Recognition, CSAR 2015

作者： Xiao, Fu Xie, Xiaohui Zhu, Hai Sun, Lijuan Wang, Ruchuan School of Computer Nanjing University of Posts and Telecommunications China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks China Key Lab of Broadband Wireless Communication and Sensor Network Technology China

ISBN: (纸本)9781450338424

WiFi signals have attracted extensive attention for context-aware due to its ubiquity. Traditional WiFi sensing methods mainly adopt Received Signal Strength Indication (RSSI), however the coarse features hamper its expansion. To achieve more finger-grained information, Channel State Information (CSI) is introduced for sensing, based on which, we design a directional human detection scheme via data prediction, which aims to visualize the variations of CSI when human appears. However, this scheme suffers from the limitations caused by the link-centric architecture of WiFi. Considering the demands for omnidirectional coverage of some scenarios (e.g. museum exhibition), we propose a omni-directional detection scheme based on fingerprinting utilizing the relationship between the CSI signal features and locations. Experiments are processed in actual scenarios and experimental results verify the feasibility of our two schemes. © 2015 ACM.

关键词： Channel state information

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A hybrid image registering algorithm of improved Powell algorithm and simulated annealing algorithm 4th

A hybrid image registering algorithm of improved Powell algo...

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4th International Conference on Electronics, communications and networks, CECNet2014

作者： Ji, Yingtian Zhang, Dengyin Tan, Lipin Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education NanjingJiangsu China

ISBN: (纸本)9781138028302

With the development of computer technology and Biomedical Engineering, the image registering technology is widely used in healthcare and the disease diagnosis and clinical care demand higher registering precision and speed. In this paper, against the defect that the Powell method is prone to obtain a local extremum, we propose an improved Powellalgorithm which can improve the registering precision and robustness with the simulated annealing algorithm in a multi-resolution strategy. The experiment demonstrates our method is an effective way to reduce the registering error. © 2015 Taylor & Francis Group, London.

关键词： Simulated annealing

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The hybrid encryption algorithm of lightweight data in cloud storage

The hybrid encryption algorithm of lightweight data in cloud...

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International Symposium on Agents, Multi-Agent Systems and Robotics (ISAMSR)

作者： Chengliang Liang Ning Ye Reza Malekian Ruchuan Wang College of Computer Nanjing University of Posts and Telecommunications Nanjing China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing China Department of Electrical Electronic and Computer Engineering University of Pretoria Pretoria South Africa Key Lab of Broadband Wireless Communication and Sensor Network Nanjing University of Post and Telecommunications Nanjing China

In this paper, we proposed a hybrid encryption algorithm in order to solve the security problems on lightweight data on the cloud storage service. This paper first improves the RSA algorithm in the cloud environment by increasing the length of the RSA key to an extent that it can quickly generate big primes. Then, we merge AES and RSA algorithms on the basis of the improved RSA algorithm. This is called a hybrid encryption algorithm which is suitable for security of the lightweight data in cloud storage environment in order to further enhance the confidentiality of data in the cloud. The experimental result shows that the hybrid encryption algorithm has advantages of fast encryption and decryption, more secure, and it is also able to settle the security problems of users' lightweight data in a certain extent.

关键词： Encryption Cloud computing Algorithm design and analysis Public key Access control

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A novel Terahertz Integrated Horn Antenna on Silicon Substrate

A novel Terahertz Integrated Horn Antenna on Silicon Substra...

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2016 2nd International Conference on Advances in Mechanical Engineering and Industrial Informatics(AMEII 2016)

作者： Lin Guo Haixia Tang Lian Ji Yongpeng Wu Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationCollege of Internet of ThingsNanjing University of Posts and Telecommunications College of Energy Nanjing University of Technology College of Communication and Information Engineering Institute for Digital CommunicationsUniversitüt Erlangen-Nürnberg

ISBN: (纸本)9781510823808

This paper reports the design and analysis of a novel pyramidal horn antenna based on Micro Electro Mechanical Systems(MEMS) technology,which is used in terahertz(THz) *** structure of the antenna includes two parts,pyramidal horn structure and rectangle waveguide for feed,the fabrication of the structure needs only one wafer,and the antenna can be easily integrated with other parts of on-chip *** are many tunable parameters of the horn,so that high performance THz antenna can be achieved by optimizing these *** proposed antenna can be manufactured by MEMS processing with low fabrication cost,suitable for many terahertz systems.

关键词： Terahertz(THz) wave micro-electromechanical Systems(MEMS) silicon substrate On-chip antenna horn antenna

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Convergence analysis and application of the central force optimization algorithm

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Science China(Information Sciences) 2015年第5期58卷 208-210页

作者： MENG Chao GONG Jing LIU SanMin SUN ZhiXin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education College of Mathematics & Physics Nanjing University of Posts and Telecommunications College of Computer and Information Anhui Polytechnic University

Dear editor,The Central Force Optimization(CFO)[1]is a new heuristic *** contrast with the stochastic algorithms such as Particle Swarm Optimization(PSO)[2],Ant Colony Optimization[3]and other such algorithms[4–6],CF... 详细信息

关键词： CFO Convergence analysis and application of the central force optimization algorithm

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