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Fog-assisted multi-user swipt networks: Local computing or offloading

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arXiv 2019年

作者： Zheng, Haina Xiong, Ke Fan, Pingyi Zhong, Zhangdui Letaief, Khaled Ben School of Computer and Information Technology Beijing Key Lab of Traffic Data Analysis and Mining Beijing Jiaotong University Beijing China Beijing Key Laboratory of Security and Privacy in Intelligent Transportation Beijing Jiaotong University Beijing100044 China National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing100084 China State Key Lab of Rail Traffic Control and Safety Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications Beijing Jiaotong University Beijing100044 China Clear Water Bay Hong Kong

This paper investigates a fog computing-assisted multi-user simultaneous wireless information and power transfer (SWIPT) network, where multiple sensors with power splitting (PS) receiver architectures receive information and harvest energy from a hybrid access point (HAP), and then process the received data by using local computing mode or fog offloading mode. For such a system, an optimization problem is formulated to minimize the sensors' required energy while guaranteeing their required information transmissions and processing rates by jointly optimizing the multi-user scheduling, the time assignment, the sensors' transmit powers and the PS ratios. Since the problem is a mixed integer programming (MIP) problem and cannot be solved with existing solution methods, we solve it by applying problem decomposition, variable substitutions and theoretical analysis. For a scheduled sensor, the closed-form and semi-closedform solutions to achieve its minimal required energy are derived, and then an efficient multi-user scheduling scheme is presented, which can achieve the suboptimal user scheduling with low computational complexity. Numerical results demonstrate our obtained theoretical results, which show that for each sensor, when it is located close to the HAP or the fog server (FS), the fog offloading mode is the better choice;otherwise, the local computing mode should be selected. The system performances in a frame-by-frame manner are also simulated, which show that using the energy stored in the batteries and that harvested from the signals transmitted by previous scheduled sensors can further decrease the total required energy of the sensors. Copyright © 2019, The Authors. All rights reserved.

关键词： Energy harvesting

Detecting multi-oriented text with corner-based region proposals

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arXiv 2018年

作者： Deng, Linjie Gong, Yanxiang Lin, Yi Shuai, Jingwen Tu, Xiaoguang Zhang, Yuefei Ma, Zheng Xie, Mei School of Information and Communication Engineering UESTC Chengdu China National Key Laboratory of Fundamental Science on Synthetic Vision Sichuan University Chengdu China Chongqing Institute of Public Security Science and Technology Chongqing China

Previous approaches for scene text detection usually rely on manually defined sliding windows. This work presents an intuitive two-stage region-based method to detect multi-oriented text without any prior knowledge regarding the textual shape. In the first stage, we estimate the possible locations of text instances by detecting and linking corners instead of shifting a set of default anchors. The quadrilateral proposals are geometry adaptive, which allows our method to cope with various text aspect ratios and orientations. In the second stage, we design a new pooling layer named Dual-RoI Pooling which embeds data augmentation inside the region-wise subnetwork for more robust classification and regression over these proposals. Experimental results on public benchmarks confirm that the proposed method is capable of achieving comparable performance with state-of-the-art methods. The code is publicly available at https://***/xhzdeng/crpn. Copyright © 2018, The Authors. All rights reserved.

关键词： Aspect ratio

Time domain acoustic scattering from locally perturbed flat substrates 1st

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Time domain acoustic scattering from locally perturbed flat ...

1st International Conference on Smart Vehicular technology, Transportation, communication and Applications, VTCA 2017

作者： Chen, Bo Zhang, Fuquan Xu, Lin Liu, Minghui College of Science Civil Aviation University of China Tianjin China Fujian Provincial Key Laboratory of Information Processing and Intelligent Control Minjiang University Fuzhou China School of Software Beijing Institute of Technology Beijing China Innovative Information Industry Research Institute Fujian Normal University Fuzhou China School of Criminal Investigation and Counter Terrorism People’s Public Security University of China Beijing China

ISBN: (纸本)9783319707297

This paper is concerned with the analysis of the time domain acoustic scattering from locally perturbed flat substrates. For this three dimensional scattering problem with unbounded scatterer, boundary integral equation is directly established on the boundary of the unbounded scatterer without application of the symmetric continuation. The well-posedness of the time domain boundary integral equation is proved. © Springer International Publishing AG 2018.

关键词： Boundary integral equations

The strength of structural diversity in online social networks

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arXiv 2019年

作者： Zhang, Yafei Wang, Lin Zhu, Jonathan J.H. Wang, Xiaofan Pentland, Alex Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China Department of Media and Communication School of Data Science City University of Hong Kong Hong Kong Hong Kong Department of Automation Shanghai University Shanghai 200444 China Media Lab Massachusetts Institute of Technology CambridgeMA02139 United States

Understanding the way individuals are interconnected in social networks is of prime significance to predict their collective outcomes. Leveraging a large-scale dataset from a knowledge-sharing website, this paper presents an exploratory investigation of the way to depict structural diversity in directed networks and how it can be utilized to predict one’s online social reputation. To capture the structural diversity of an individual, we first consider the number of weakly and strongly connected components in one’s contact neighborhood and further take the coexposure network of social neighbors into consideration. We show empirical evidence that the structural diversity of an individual is able to provide valuable insights to predict personal online social reputation, and the inclusion of coexposure network provides an additional ingredient to achieve that goal. After synthetically controlling several possible confounding factors through matching experiments, structural diversity still plays a nonnegligible role in the prediction of personal online social reputation. Our work constitutes one of the first attempts to empirically study structural diversity in directed networks and has practical implications for a range of domains, such as social influence and collective intelligence studies. Copyright © 2019, The Authors. All rights reserved.

关键词： Social networking (online)

Block encryption of quantum messages

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arXiv 2018年

作者： Liang, Min Yang, Li Data Communication Science and Technology Research Institute Beijing100191 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing100093 China University of Chinese Academy of Sciences Beijing100049 China

In modern cryptography, block encryption is a fundamental cryptographic primitive. However, it is impossible for block encryption to achieve the same security as one-time pad. Quantum mechanics has changed the modern cryptography, and lots of researches have shown that quantum cryptography can outperform the limitation of traditional cryptography. This article proposes a new constructive mode for private quantum encryption, named EHE, which is a very simple method to construct quantum encryption from classical primitive. Based on EHE mode, we construct a quantum block encryption (QBE) scheme from pseudorandom functions. If the pseudorandom functions are standard secure, our scheme is indistinguishable encryption under chosen plaintext attack. If the pseudorandom functions are permutation on the key space, our scheme can achieve perfect security. In our scheme, the key can be reused and the randomness cannot, so a 2n-bit key can be used in an exponential number of encryptions, where the randomness will be refreshed in each time of encryption. Thus 2n-bit key can perfectly encrypt O(n2n) qubits, and the perfect secrecy would not be broken if the 2n-bit key is reused for only exponential times. Comparing with quantum one-time pad (QOTP), our scheme can be the same secure as QOTP, and the secret key can be reused (no matter whether the eavesdropping exists or not). Thus, the limitation of perfectly secure encryption (Shannon’s theory) is broken in the quantum setting. Moreover, our scheme can be viewed as a positive answer to the open problem in quantum cryptography "how to unconditionally reuse or recycle the whole key of private-key quantum encryption". In order to physically implement the QBE scheme, we only need to implement two kinds of single-qubit gates (Pauli X gate and Hadamard gate), so it is within reach of current quantum technology. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum cryptography

Image Encryption Using 2D Sine-Piecewise Linear Chaotic Map

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Image Encryption Using 2D Sine-Piecewise Linear Chaotic Map

International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR)

作者： Yan-Ru Zhong Hua-Yi Liu Xi-Yan Sun Ru-Shi Lan Xiao-Nan Luo School of Computer Science and Information Security Guilin University of Electronic Technology Guilin China School of Information and Communication Guilin University of Electronic Technology Guilin China Guangxi Colleges and Universities Key Laboratory of Intelligent Processing of Computer Image and Graphics Guilin University of Electronic Technology Guilin China

In this paper, a new image encryption algorithm is proposed by integrating Sine and piecewise linear chaotic maps. In order to realize the effect of encrypted image, the security key and 2D Sine-piecewise linear chaotic map (SPLCM) are used to encrypt the image by using random sequence and random matrix, and then using the replacement operation and the diffusion operation of the original image. The proposed image encryption algorithm is simple and practical, and the simulation results show that this algorithm is able to encrypt different types of digital images into unidentifiable random images. The security analysis also shows that this algorithm has a higher security level.

关键词： Encryption Two dimensional displays Digital images Chaotic communication

A new real-time calculating method for TDOA and FDOA passive location

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A new real-time calculating method for TDOA and FDOA passive...

2016年第二届能源设备科学与工程国际学术会议

作者： Yiming Zhou Jiawei Zhu No.36 Research Institute of CETC Science and Technology on Communication Information Security Control Laboratory

By researching on the differential evolution(DE)algorithm and passive localization model of two-station time difference of arrival(TDOA)and frequency difference of arrival(FDOA),a new calculating method based on DE algorithm is proposed for real-time *** precision position estimating employing time cumulate TDOA and FDOA values is also solved by this *** cases using both Instantaneous and multiple measurements are simulated,which show the more excellent performance on realtime effect and location precision comparing with unscented Kalman filter(UKF)*** location precision almost achieves the Cramer-Rao low bound(CRLB).Due to the simple principle and easy realization,this method is suitable for project application.

关键词： A new real-time calculating method for TDOA and FDOA passive location

Humidity Error Compensating of MEMS Gyros Based on A daptive Threshold Denoising and RBF Neural Network

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Humidity Error Compensating of MEMS Gyros Based on A daptive...

第37届中国控制会议

作者： Wang Xin-wang Shen Xiao-lin Cao Hui-liang Deng Bo-wen School of Electrical and Control Engineering North University of China IEEE Science and Technology on Electronic Test & Measurement Laboratory North University of China School of Information and Communication Engineering North University of China

The large random errors in a typical MEMS gyros under the ranges of relative humidity *** order to solve the large random error under the ranges of relative humidity,a method based on adaptive threshold denoising and neural net work is proposed in this *** relative humidity experiment is carried to test LSM6DS3 MEMS *** the adaptive threshold denoising is used to separate the drift error and drift data modeled with RBF neural *** experimental res ults show the effectiveness of the method,and it is of great significance in improving the performance of MEMS gyros.

关键词： MEMS gyroscopes relative humidity adaptive threshold function random error model error compensations radial basis function neural network

A Route Optimization Model Based on Link State Awareness in SDN

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Journal of Physics: Conference Series 2019年第4期1187卷

作者： Ran Li ZhaoWen Lin Jie Xu Yi Sun Network and Information Center Institute of Network Technology Beijing University of Posts and Telecommunications Beijing 100876 China 2 Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory Shijiazhuang 050081 China 3 National Engineering Laboratory for Mobile Network Security Beijing 100876 China

In addressing the routing issue in the SDN environment, an improved ant colony algorithm is proposed in this paper, in which the ants tend to balance the path with less pheromone. Besides, the Top-K optimal path algorithm is used to optimize the evaluation set, speed up the evaluation, collect the status of the link in the network, and dynamically adjust the evaporation speed of the pheromone to ensure the real-time accuracy of the routing strategy. The QoS requirements of the service are also guaranteed according to the collected link QoS requirements. In such a scheme, combining the advantages of probabilistic routing and deterministic routing, path optimization is better achieved. The simulation of the traffic shows that the model can significantly improve the throughput of traffic in the SDN network, reduce the packet loss rate, and effectively guarantee load balancing.

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