检索结果-内蒙古大学图书馆

Complete logic Bell-state analysis assisted with photonic Faraday rotation

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

来源：评论

学校读者我要写书评

暂无评论

Improved medical image registration based on mutual information and gradient information

Improved medical image registration based on mutual informat...

引用

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

来源：评论

学校读者我要写书评

暂无评论

Approaching the ideal quantum key distribution with two-intensity decoy states

引用

Physical Review A 2015年第2期92卷 022332-022332页

作者： Chun-Hui Zhang Sun-Long Luo Guang-Can Guo Qin 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 Academy of Mathematics and Systems Science Chinese Academy of Sciences 100190 Beijing China Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China

We present a scheme for the practical decoy-state quantum key distribution with heralded single-photon source. In this scheme, only two-intensity decoy states are employed. However, its performance can approach the asymptotic case of using infinite decoy states. We compare it with the standard three-intensity decoy-state method, and through numerical simulations, we demonstrate its significant improvement over the three-intensity method in both the final key rate and the secure transmission distance. Furthermore, when taking statistical fluctuations into account, a very high key generation rate can still be obtained even at a long transmission distance.

关键词： QUANTUM mechanics PHOTON number COMPUTER simulation DISTRIBUTION (Probability theory) PARAMETER estimation

来源：评论

学校读者我要写书评

暂无评论

An Improved DV-Hop Positioning Algorithm for wireless sensor network

An Improved DV-Hop Positioning Algorithm for Wireless Sensor...

引用

2015 IEEE International Conference on Progress in Informatics and Computing(PIC 2015)

作者： Jiuhu Zheng Huanyan Qian Lie Wang School of Computer Science and Engineering Nanjing University of Science and Technology School of Information Technology Jiangsu Institute of Commerce Key Lab of Broadband Wireless Communication and Sensor Network Technology ( Nanjing University of Posts and Telecommunications) Ministry of Education National Mobile Communications esearch Laboratory Southeast University

In the view of the DV-Hop positioning algorithm which relies on the distance vector and beacon nodes, several aspects are improved: the average hop distance and hop count are corrected;a method to detect the abnormal distribution of beacon nodes is used to avoid the influence of the abnormal distribution on the positioning performance. The proposed algorithm is simple and effective. Simulation results show that compared with the traditional DV-Hop algorithm, the performance of the proposed algorithm is greatly *** performance is even even superior to that of the algorithm mentioned in literature [10]

关键词： wireless sensor network DV-Hop algorithm node positioning positioning accuracy

来源：评论

学校读者我要写书评

暂无评论

Clustered Spatio-Temporal Compression Design for wireless sensor networks

Clustered Spatio-Temporal Compression Design for Wireless Se...

引用

International Conference on Computer communications and networks (ICCCN)

作者： Siguang Chen Chuanxin Zhao Meng Wu Zhixin Sun Jian Jin Department of Electrical and Computer Engineering The University of British Columbia Vancouver Canada Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China School of Electrical Engineering and Computing Curtin University Perth Australia

Since the temporal and spatial correlations of sensor readings are existent in wireless sensor networks (WSNs), this paper develops a clustered spatio-temporal compression scheme by integrating network coding (NC) and compressed sensing (CS) for correlated data. The proper selections of NC coefficients and measurement matrix are designed for this scheme. This design guarantees the reconstruction of clustered compression data successfully with an overwhelming probability and unifies the operations of NC and CS into real field successfully. Moreover, in contrast to other spatio-temporal schemes with the same computational complexity, the proposed scheme possesses lower reconstruction error by employing the independent encoding in each sensor node (including the cluster head nodes) and joint decoding in sink node. At the same time it has lower computational complexity as compared with JSM-based spatio-temporal scheme by exploiting the temporal and spatial correlations of original sensing data step by step. Finally, the simulation results verify that the clustered spatio-temporal compression scheme outperforms the other two compression schemes significantly in terms of recovery error and compression gain.

关键词： Correlation wireless sensor networks sensors Encoding Computational complexity Decoding Security

来源：评论

学校读者我要写书评

暂无评论

Outage analysis of OFDM full Duplex relaying systems

Outage analysis of OFDM full Duplex relaying systems

引用

International Conference on wireless communications and Signal Processing (WCSP)

作者： Songqing Wang Wendong Yang Wei Xu Jinling Hospital Nanjing University School of Medicine Nanjing China College of Communications Engineering PLA University of Science and Technology Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications). Ministry of Education Nanijing China PLA 95269 Troop Guangzhou China

ISBN: (纸本)9781467376884

This paper focuses on decode-and-forward (DF) OFDM full duplex relaying (FDR) systems with multiple relays, where residual loop interference is taken into account. Closed-form and high-SNR approximate expressions for the outage probability are derived. Simulations are carried out to validate the derived outage performance and compare the performance of OFDM FDR with that of OFDM half duplex relaying (HDR) systems.

关键词： OFDM Relays Interference Approximation methods Signal to noise ratio wireless communication Broadband communication

来源：评论

学校读者我要写书评

暂无评论

Defense technology of Wormhole Attacks Based on Node Connectivity

Defense Technology of Wormhole Attacks Based on Node Connect...

引用

IEEE International Conference on Smart City/SocialCom/SustainCom (SmartCity)

作者： Jiu-hu Zheng Huan-yan Qian Lei Wang School of Information Technology Jiangsu Institute of Commerce Nanjing Jiangsu China School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing Jiangsu China National Mobile Communications esearch Laboratory Southeast University Nanjing Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing Jiangsu China

ISBN: (纸本)9781509018949

After wormhole attacks the routing mechanism of wireless sensor network (WSN) is damaged, then the hop count and distance between nodes cannot be well matched, so that the WSN becomes the anisotropic sensor network, resulting in security treats for WSN. Considering that wormhole attacks can cause the changing of node connectivity, through the theoretical analysis and derivation, the paper has proposed a method which detects wormhole attacks with the connected relation of high connectivity nodes, and optimizes routing with the help of the normal nodes outside the wormhole. Simulation results show that the algorithm can well detect wormhole attacks and has better localization accuracy In addition, the effect is more obvious in the case of the wormhole nodes with large communication radius and long distance.

关键词： wireless sensor networks Routing Probability Algorithm design and analysis Security Simulation Computer science

来源：评论

学校读者我要写书评

暂无评论

Preparation of biomedical Ag incorporated hydroxyapatite/titania coatings on Ti6Al4V alloy by plasma electrolytic oxidation

引用

Chinese Physics B 2014年第3期23卷 427-434页

作者：周澜吕国华毛菲菲杨思泽 College of Mathematics & Physics Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Institute of Physics Chinese Academy of Sciences Department of Oral and Maxillofacial Surgery Interdisciplinary LaboratoryPeking University School of Stomatology Fujian Key Laboratory for Plasma and Magnetic Resonance Department of AeronauticsSchool of Physics and Mechanical & Electrical Engineering Xiamen University

Nano-Ag incorporated hydroxyapatite/titania （HA/TiO2） coatings were deposited on Ti6A14V substrates by the plasma electrolytic oxidation process. Compared with the substrate, the deposited coatings display attractive mechani- cal and biomedical properties. First, the coatings have stronger wear resistance and corrosion resistance. Second, they show a strong antibacterial ability. The mean vitality of the P. gingivalis on the coating surfaces is reduced to about 21%. Third, the coatings have good biocompatibility. The mean viability of the fibroblast cells on the coating surface is increased to about 130%. With these attractive properties, Ag incorporated HA/TiO2 coatings may be useful in the biomedical field.

关键词： hydroxyapatite corrosion resistance antibacterial ability biocompatibility

来源：评论

学校读者我要写书评

暂无评论

C-PESA: An improved comentropy-based PESA algorithm

引用

2012 International Conference on Electrical and Electronics Engineering, ICEE 2012

作者： Wang, Kun Wang, Linlin Zhang, Yuhua Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China College of Overseas Nanjing University of Posts and Telecommunications Nanjing 210003 China

ISBN: (纸本)9781461449805

To solve the increasing complexity with the growth of solution sets number in PESA, we present a comentropy-based PESA algorithm (C-PESA), which is an evolutionary algorithm of multi-objective optimization. In C-PESA, the gradual development and maturity of the solution sets can be observed with the continuous calculation of entropy values. This determines whether to stop the optimization process, and accordingly simplifies the run-time complexity of the algorithm to a certain degree. Simulation results show that the calculation amount of C-PESA increases linearly with the increasing number of population, and the efficiency of evolutionary algorithm also improves. © 2014 Springer Science+Business Media New York.

关键词： Evolutionary algorithms

来源：评论

学校读者我要写书评

暂无评论

An improved DV-Hop positioning algorithm for wireless sensor network

An improved DV-Hop positioning algorithm for wireless sensor...

引用

IEEE International Conference on Progress in Informatics and Computing (PIC)

作者： Jiuhu Zheng Huanyan Qian Lie Wang School of Information Technology Jiangsu Institute of Commerce Nanjing Jiangsu China School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing Jiangsu China School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing Nanjing Jiangsu China National Mobile Communications esearch Laboratory Southeast University Nanjing Jiangsu China Ministry of Education Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Nanjing Jiangsu China

In the view of the DV-Hop positioning algorithm which relies on the distance vector and beacon nodes, several aspects are improved: the average hop distance and hop count are corrected; a method to detect the abnormal distribution of beacon nodes is used to avoid the influence of the abnormal distribution on the positioning performance. The proposed algorithm is simple and effective. Simulation results show that compared with the traditional DV-Hop algorithm, the performance of the proposed algorithm is greatly improved. The performance is even even superior to that of the algorithm mentioned in literature [10].

关键词： wireless sensor networks Mobile communication Hardware Maximum likelihood estimation Mathematical model Computer science Broadband communication

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：