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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 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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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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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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A novel saliency detection model based on curvelet transform

A novel saliency detection model based on curvelet transform

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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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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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Scheme for realizing passive quantum key distribution with heralded single-photon sources

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Physical Review A 2016年第3期93卷 032312-032312页

作者： Qin Wang Chun-Hui Zhang Xiang-Bin Wang 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 Nanjing 210003 China Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China Department of Physics and State Key Laboratory of Low Dimensional Quantum Physics Tsinghua University Beijing 100084 China Jinan Institute of Quantum Technology Shandong Academy of Information Technology Jinan China

We present a scheme for realizing passive quantum key distribution with heralded single-photon sources. In this scheme, the idler light from the parametric down-conversion process is split into two parts and sent into two local detectors individually. Then all the clicking and nonclicking events are used to herald the arrival and nonarrival of the signal light. As a result, a precise estimation of the behavior of the single-photon pulses can be achieved without changing the light intensity. Furthermore, we compare our scheme with other existing methods with the Bennett-Brassard 1984 (BB84) protocol through numerical simulations. Our simulations demonstrate that the performance of our scheme can greatly overcome other existing practical methods and approach very close to the asymptotic case of using infinite-decoy-state methods.

关键词： Quantum cryptography

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T-QoS-aware based parallel ant colony algorithm for services composition

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Journal of Systems Science & Complexity 2015年第5期28卷 1100-1106页

作者： Lin Zhang Kaili Rao Ruchuan Wang College of Computer Nanjing University of Posts and Telecommunications Institute of Computer Technology 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 Nangjing University of Posts and Telecommunications

In order to make cloud users get credible, high-quality composition of services, the trust quality of service aware(TQoS-aware) based parallel ant colony algorithm is proposed. Our approach takes the service credibility as the weight of the quality of service, then calculates the trust service quality T-QoS for each service, making the service composition situated in a credible environment. Through the establishment on a per-service T-QoS initialization pheromone matrix, we can reduce the colony's initial search time. By modifying the pheromone updating rules and introducing two ant colonies to search from different angles in parallel,we can avoid falling into the local optimal solution, and quickly find the optimal combination of global solutions. Experiments show that our approach can combine high-quality services and the improvement of the operational success rate. Also, the convergence rate and the accuracy of optimal combination are improved.

关键词： services composition trust service quality ant colonyalgorithm parallel

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International Symposium on Computational Intelligence and Design, ISCID

作者： Lijun Yang Chao Ding Meng Wu College of Internet of Things Nanjing University of Posts and Telecommunications Nanjing China College of Computer Science Nanjing University of Posts and Telecommunications Nanjing China Key Lab of “Broadband Wireless Communication and Sensor Network Technology” of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781509035595

The node replica attack is known to be dangerous to wireless sensor networks (WSNs) because it enables the adversary to extend the damage throughout the network with very low cost. To stop such attack, we propose a similarity estimation based scheme with group deployment knowledge. Compared with prior works, our proposal provides extra functionality that prevent replica from generating false location claims. Through simulation experiment, we evaluate the performance of the proposed scheme and demonstrate that our scheme achieves effectiveness and efficiency under different situations and attack strategies.

关键词： wireless sensor networks Authentication Telecommunications Electronic mail Measurement Encoding

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Deterministic realization of collective measurements via photonic quantum walks

arXiv

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arXiv 2017年

作者： Hou, Zhibo Tang, Jun-Feng Shang, Jiangwei Zhu, Huangjun Li, Jian Yuan, Yuan Wu, Kang-Da Xiang, Guo-Yong Li, Chuan-Feng Guo, Guang-Can Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Naturwissenschaftlich-Technische Fakultät Universität Siegen Siegen57068 Germany Beijing Key Laboratory of Nanophotonics Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China Institute for Theoretical Physics University of Cologne Cologne50937 Germany Department of Physics Center for Field Theory and Particle Physics Fudan University Shanghai200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing210003 China

Collective measurements on identically prepared quantum systems can extract more information than local measurements, thereby enhancing information-processing efficiency. Although this nonclassical phenomenon has been known for two decades, it has remained a challenging task to demonstrate the advantage of collective measurements in experiments. Here we introduce a general recipe for performing deterministic collective measurements on two identically prepared qubits based on quantum walks. Using photonic quantum walks, we realize experimentally an optimized collective measurement with fidelity 0.9946 without post selection. As an application, we achieve the highest tomographic efficiency in qubit state tomography to date. Our work offers an effective recipe for beating the precision limit of local measurements in quantum state tomography and metrology. In addition, our study opens an avenue for harvesting the power of collective measurements in quantum information processing and for exploring the intriguing physics behind this power. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum optics

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