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作者： Shen, Jian Shen, Jun Li, Xiong Wei, Fushan Li, Jiguo Department of Jiangsu Engineering Center of Network Monitoring Jiangsu210044 China Technology and Engineering Center of Meteorological Sensor Network Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing Jiangsu210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing210044 China Hunan University of Science and Technology Hunan410082 China PLA Information Engineering University Henan450002 China Hohai University Nanjing210098 China

The rapid development of cloud storage has caused a wave of research craze. To improve cloud user experience, a large number of schemes are proposed with various practical performances, like long-term correct ensurence and dynamic support. In most works, however, authors seem to completely ignore that data owner alone could not have enough energy to discover and correct all inappropriate data outsourced. Others considered it and gave more than one user both read and write permissions, leading to chaotic management of multiusers. In this paper, we propose a novel algorithm, where data owner and authenticated assistants form a team to support data dynamics. Assistants are in charge of detecting problems of data and discussing a corresponding modification suggestion, while data owner is responsible for the implementation of the modification. Additionally, our algorithm supports identity authentication, malicious assistant revocation, and lazy update. Sufficient numerical analysis validates the performance of our algorithm. Copyright © 2017 Inderscience Enterprises Ltd.

关键词： Cloud storage

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Internal and external optical feedback effect in fiber linear lasers

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Journal of networks 2013年第9期8卷 1990-1996页

作者： Zhou, Junping Xia, Jingming Ge, Yixian Chernoff, Eric Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China Hangzhou International School Hangzhou China

In this paper, models of internal and external optical feedback effect in fiber linear lasers have been presented. The effects of optical feedback could be equivalent to the variation of laser cavity loss, and the output expressions of two models are deduced. According to the simulation results, the optical feedback system in fiber linear lasers has the same phase sensitivity as the traditional self-mixing effect in semiconductor lasers. The experimental results show a good agreement with the simulated results. Comparing the output of internal structure with that of external structure, we can conclude that the internal optical feedback system can get higher output gain and stripe depth, which reveals that the internal feedback structure has better sensing characteristics. © 2013 ACADEMY PUBLISHER.

关键词： Fiber lasers

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UWB autocorrelation receiver based on average differential transmitted reference

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Journal of networks 2012年第11期7卷 1868-1875页

作者： Wang, Feng Ji, Xuande Wang, Yuyan Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China Department of Electrical Engineering and Automation Luoyang Institute of Science and Technology Luoyang China

There are strong noise components included in the reference signal and the received signal of the ultra- wideband (UWB) differential transmitted reference (DTR) autocorrelation receiver, which impact on the receiver's performance seriously. Therefore this paper proposes a autocorrelation receiver based on average differential transmitted reference (ADTR). This receiver averages the received signals within every frame of the previous symbol period to form the new reference signal. The received signals within each frame of the current symbol interval are also averaged to construct the new received signal, which is correlated with the new reference signal to restore the transmitted symbols. Theoretical analysis and simulation results confirm that BER performance of ADTR autocorrelation receiver is better than the DTR receiver. Compared with DTR receiver, the signal to noise ratio gains of the ADTR receiver are 1.1dB with Ns=3 and 2.1dB with Ns=6 respectively when BER=10-4. © 2012 ACADEMY PUBLISHER.

关键词： Signal to noise ratio

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Compressed Sensing MRI via a Multi-scale Dilated Residual Convolution network

arXiv

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arXiv 2019年

作者： Dai, Yuxiang Zhuang, Peixian Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Technology and Engineering Center of Meteorological Sensor Network School of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing210044 China

Magnetic resonance imaging (MRI) reconstruction is an active inverse problem which can be addressed by conventional compressed sensing (CS) MRI algorithms that exploit the sparse nature of MRI in an iterative optimization-based manner. However, two main drawbacks of iterative optimization-based CSMRI methods are time-consuming and are limited in model capacity. Meanwhile, one main challenge for recent deep learning-based CSMRI is the trade-off between model performance and network size. To address the above issues, we develop a new multi-scale dilated network for MRI reconstruction with high speed and outstanding performance. Comparing to convolutional kernels with same receptive fields, dilated convolutions reduce network parameters with smaller kernels and expand receptive fields of kernels to obtain almost same information. To maintain the abundance of features, we present global and local residual learnings to extract more image edges and details. Then we utilize concatenation layers to fuse multi-scale features and residual learnings for better reconstruction. Compared with several non-deep and deep learning CSMRI algorithms, the proposed method yields better reconstruction accuracy and noticeable visual improvements. In addition, we perform the noisy setting to verify the model stability, and then extend the proposed model on a MRI super-resolution task. Keywords: MRI Reconstruction, Dilated Convolution, Residual Learning, Copyright © 2019, The Authors. All rights reserved.

关键词： Magnetic resonance imaging

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A FEM Model for Interactive Simulation of Guide Wire Navigation in Moving Vascular Structures

A FEM Model for Interactive Simulation of Guide Wire Navigat...

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International Conference on Intelligent System Design and engineering Application (ISDEA)

作者： Zhang Qiukui Pascal Haigron Jiangsu Technology & Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing Jiangsu China LTSI University of Rennes 1 Rennes France

In this paper a FEM model is proposed to simulate the guide wire navigation procedure in moving vascular structures. The virtual instruments are discretized with the multi-body representation, while the moving vascular structures are represented by a sequence of binary volumes segmented from the patient's data sets. The corresponding potential fields can be obtained by applying distance transform to the dynamic volumes. The collision and interaction between instruments and the moving vascular structures can be efficiently simulated with the potential fields and the FEM model, which drastically reduce the complexity of computation and makes interactive simulation possible. Comparing with mesh-based methods, the approach is both efficient and robust. Experimental results show the approach significantly improves the performance of simulation, especially in the circumstance of guide wire navigation in moving vessels.

关键词： Wires Instruments Navigation Solid modeling Computational modeling Force Torque

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Weighted Multi-Modulus Blind Equalization Algorithm Based on Momentum Term

Weighted Multi-Modulus Blind Equalization Algorithm Based on...

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2011 International Conference on Mechanical engineering and technology(ICMET 2011)

作者： Shijie Guo Fang Xu Wencai Xu Kang Fan College of Physics and Electronic Information Huaibei Normal University Nanjing University of Information Science & Technology Jiangsu Technology and Engineering Center of Meteorological Sensor NetworkJiangsu Key Laboratory of Meteorological Observation and Information Processing

In order to overcome the defects of traditional constant modulus blind equalization algorithm in equalizing higher-order QAM(Quadrature Amplitude Modulation) signals, on the basis of combining the momentum term algorithm and the weighted multi-modulus blind equalization algorithm, Momentum term based Weighted Multi-Modulus blind equalization Algorithm(WMMA) is proposed. In the proposed algorithm, weighted multi-modulus blind equalization algorithm is used to adjust the modulus of the cost function adaptively and momentum term is employed to improve the convergence speed. The simulation results in the underwater acoustic channel show that the proposed algorithm has higher convergence speed and accuracy than Multi-Modulus blind equalization Algorithm(MMA) and Constant Modulus blind equalization Algorithm(CMA).

关键词： blind equalization algorithm,weighted multi-modulus algorithm,momentum term

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Application of Composite Hermitian Operator Eigenfunctions on Analysis of RCS

Application of Composite Hermitian Operator Eigenfunctions o...

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IEEE International Workshop on Electromagnetics

作者： You-Bao Wang Xiang Wang Yue-Fei Rao Shun Xiao Jiangsu Key Laboratory of Meteorological Observation and Information Processing Jiangsu Technology & Engineering Center of Meteorological Sensor Network Nanjing University of Information Science & Technology Nanjing China. Post Code: 210044.

ISBN: (纸本)9781467381956

The technique to integrate the composite hermitian operator eigenfunctions (CHOEs) with the general asymptotic waveform evaluation (GAWE) is proposed for computing the radar cross section (RCS) of a perfect electric conductor (PEC). In the analysis, the orthogonal and complete properties of the CHOEs are used to construct the solution space of a matrix equation. Hence, the solution of the equation can be obtained by combining the based-vectors of the solution space with a set of coefficients, which can be determined by the GAWE technique at a given frequency. The results of numerical examples prove that the novel technique is effective in computing RCS.

关键词： GAWE RCS PEC

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An enhanced ID-updating hash-based RFID authentication protocol with strong privacy protection

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Journal of Computers (Taiwan) 2016年第4期27卷 121-129页

作者： Shen, Jian Chang, Shaohua Tan, Haowen Ji, Sai Wang, Jin Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing China Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing University of Information Science and Technology Nanjing China School of Computer and Software Nanjing University of Information Science and Technology Nanjing China

RFID authentication has raised many concerns about the security risks and privacy issues due to its lightweight authentication properties. Many research achievements in RFID focus on strengthening the entire RFID system and solving the security problems. Recently, a hash-based RFID security protocol with the intension of updating the identifier of the tag in both the reader side and the tag side itself was proposed. However, there exists inherent risk in the ID-updating procedure. In the scenario that the adversary blocks the legal messages continuously for several times, the backend processing system (BPS) cannot recognize the tag due to the desynchronization of the identifier in last several sessions. Thus the tag will be invalid and cannot be reused again. In this paper, we propose an enhanced ID-updating hash-based RFID authentication protocol with strong privacy protection. In our protocol the ID-updating procedure is resistant to de-synchronization attack. Additionally, the possible feedbacks towards different cases of the tag are taken into consideration. Our proposed protocol is proved to be effective and secure in real applications. Above all, the de-synchronization attack towards the communication between the tag and reader can be prevented according to our design. The identifier of the RFID tag is assumed to be updated with cryptographic hash functions during every session. In this way the identifier can be synchronized in both the BPS side and the RFID tag side. The location privacy of the tag can be protected in our protocol. © 2016, Computer Society of the Republic of China. All rights reserved.

关键词： Radio frequency identification (RFID)

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Auditing Protocols for Cloud Storage: A Survey

Auditing Protocols for Cloud Storage: A Survey

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International Conference on Computational Intelligence Theory, Systems and Applications (CCITSA)

作者： Jun Shen Sai Ji Jian Shen Zhangjie Fu Jin Wang School of Computer & Software Nanjing University of Information Science & Technology China Jiangsu Technology &Engineering Center of Meteorological Sensor Network Naniing University of Information Science & Technologgy China

So far, cloud storage has been accepted by an increasing number of people, which is not a fresh notion any more. It brings cloud users a lot of conveniences, such as the relief of local storage and location independent access. Nevertheless, the correctness and completeness as well as the privacy of outsourced data are what worry could users. As a result, most people are unwilling to store data in the cloud, in case that the sensitive information concerning something important is disclosed. Only when people feel worry-free, can they accept cloud storage more easily. Certainly, many experts have taken this problem into consideration, and tried to solve it. In this paper, we survey the solutions to the problems concerning auditing in cloud computing and give a comparison of them. The methods and performances as well as the pros and cons are discussed for the state-of-the-art auditing protocols.

关键词： Cloud computing Protocols Data models Computational modeling Security Information science Scalability

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A Video Streaming Application Layer Multicast Protocol for WLAN

A Video Streaming Application Layer Multicast Protocol for W...

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The 2011 International Conference on Materials engineering for Advanced Technologies(ICMEAT 2011)

作者： CHENG Yong WEN Lei YANG Ling WANG Wei ZHOU Yong WANG Feng Jiangsu Technology and Engineering Center for Meteorological Sensor Network Nanjing University of Information Science & Technology Computer School Wuhan University Bin Jiang College Nanjing University of Information Science & Technology

The problem solved in this paper is to design a video streaming protocol which is accomplished by the application layer multicast in the WLANThis protocol, WVALM, divides the whole video streaming into small blocks, and achieves the requirement of streaming multicast by multicasting those small blocksThe receiver and the sender use streaming window and retransmit window respectively to coordinate their relationshipThrough experiment test, WVALM achieves the original object and could work well in the wireless environment.

关键词： video streaming,application layer multicast,WLAN,p2p

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