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arXiv 2019年

作者： He, Xingkang Johansson, Karl H. Fang, Haitao Division of Decision and Control Systems School of Electrical Engineering and Computer Science KTH Royal Institute of Technology StockholmSE-100 44 Sweden LSC NCMIS Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China School of Mathematical Sciences University of Chinese Academy of Sciences Beijing100049 China

We study distributed filtering for a class of uncertain systems over corrupted communication channels. We propose a distributed robust Kalman filter with stochastic gains, through which upper bounds of the conditional mean square estimation errors are calculated online. We present a robust collective observability condition, under which the mean square error of the distributed filter is proved to be uniformly upper bounded if the network is strongly connected. For better performance, we modify the filer by introducing a switching fusion scheme based on a sliding window. It provides a smaller upper bound of the conditional mean square error. Numerical simulations are provided to validate the theoretical results and show that the filter scales to large networks. Copyright © 2019, The Authors. All rights reserved.

关键词： Mean square error

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A New Anti-Spam Model Based on E-mail Address Concealment Technique

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Wuhan University Journal of Natural Sciences 2018年第1期23卷 79-83页

作者： ZHANG Yuqiang HE Jingsha XU Jing Beijing Institute of Aerospace Control Devices Beijing100039 China College of Computer Science and Technology Beijing University of Technology Beijing 100124 China School of Software Engineering Beijing University ofTechnology Beijing 100124 China Department of Automation Tsinghua University Beijing100084 China

To deal with the junk e-mail problem caused by the e-mail address leakage for a majority of Internet users, this paper presents a new privacy protection model in which the e-mail address of the user is treated as a piece of privacy information concealed. Through an interaction pattern that involves three parties and uses an e-mail address code in the place of an e-mail address, the proposed model can prevent the e-mail address from being leaked, thus effectively resolving the junk e-mail problem. We compare the proposed anti-spam method with the filtering technology based on machine learning. The result shows that 100% spams can be filtered out in our scheme, indicating the effectiveness of the proposed anti-spam method.

关键词： spare e-mail address protection model e-mail address code

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A review of research on object detection based on deep learning

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Journal of Physics: Conference Series 2020年第1期1684卷

作者： Jun Deng Xiaojing Xuan Weifeng Wang Zhao Li Hanwen Yao Zhiqiang Wang Xi'an University of Science and Technology School of Safety Science and Engineee Xi'an Shaan Xi Xi'an University of Science and Technology School of Computer Science and Technology Xi'an Shaan Xi Xi'an University of Science and Technology School of Energy and Power Engineering Xi'an Shaan Xi Xi'an University of Science and Technology School of Electrical and Control Engineering Xi'an Shaan Xi

As one of the important tasks in computer vision, target detection has become an important research hotspot in the past 20 years and has been widely used. It aims to quickly and accurately identify and locate a large number of objects of predefined categories in a given image. According to the model training method, the algorithms can be divided into two types: single-stage detection algorithm and two-stage detection algorithm. In this paper, the representative algorithms of each stage are introduced in detail. Then the public and special datasets commonly used in target detection are introduced, and various representative algorithms are analyzed and compared in this field. Finally, the potential challenges for target detection are prospected.

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Research on Early Warning System of Power Network Overloading under Serverless Architecture 2

Research on Early Warning System of Power Network Overloadin...

引用

2nd IEEE Conference on Energy Internet and Energy System Integration, EI2 2018

作者： Geng, Xinzhou Ma, Oiuzhe Pei, Yunman Xu, Zhibo Zeng, Wenjing Zou, Jing State Grid Economic and Technological Research Institute Co. Ltd State Grid Corporation of China Beijing China Institute of Network and Information Systems School of Control and Computer Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781538685495

Under the background of massive computing resources in power grid, smart grid has become the direction and trend of power industry development. In order to ensure the safe and stable operation of smart grid, the monitoring of the grid load should be strengthened and a reasonable solution should be arranged in time when the grid load exceeded the standard. So early warning system of power network overloading under serverless architecture was proposed. The main advantages of the combination of smart grid and serverless architecture were analyzed in detail, and the technical feasibility and economic feasibility of the early warning system for grid overload under the serverless mode were analyzed by examples. © 2018 IEEE.

关键词： Smart power grids

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Integrated Route and Charging Planning for Electric Vehicles Considering Nonlinear Charging Functions

Integrated Route and Charging Planning for Electric Vehicles...

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International Conference on computer Supported Cooperative Work in Design

作者： Ying Zhang Qunfei Ma Xin Zhang Minghe Gao Puhai Yang Hui He Xiang Hu Baltabay Aliya School of Control and Computer Engineering North China Electric Power University Beijing China School of Computer Science and Technology Changchun University of Science and Technology Changchun China

Considering the carbon emission reduction and energy saving, the electric vehicles (EVs) have been identified as a promising alternative to classical fossil fuel-driven vehicles. Consequently, the Electric Vehicle Route Planning with Recharging (EVRC) problem extends traditional routing problems to take the limited capacity of the vehicle's battery into consideration. In order to avoid the depletion of battery, planned detours should be introduced to recharge the battery. As the previous research works mainly focused on the three assumptions: (1) EVs will be fully charged when they get a CS; (2) The charging time rises linearly as the battery charge level ascends;(3) Serve time is not considered in the whole process. However, in the actual situations, the location of the used charging stations and the amount of charge are decision variables. In addition, the charging function is not linear. In this work, we propose an integrated route and charging planning for EVs, and take partial charging, nonlinear charging functions as well as serve time into consideration. The experimental result shows that it leads to infeasible or excessively costly solutions when the serve time and the features of partial and nonlinear charging process are ignored.

关键词： Batteries Charging stations Energy consumption Electric vehicles Planning Time-frequency analysis Routing

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Modeling and Simulation of Double Capacity Tank Level control System Based on Linear Graph Theory

Modeling and Simulation of Double Capacity Tank Level Contro...

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Chinese control Conference (CCC)

作者： Hui Leng Yue Zhang Hebei Power Generation Process Simulation and Optimization Control Engineering Technology Research Center Baoding China North China Electric Power School of Control and Computer Engineering Beijing

The double-capacity tank liquid level system has the characteristics of inertia, time delay and nonlinearity. Many practical industrial objects can be abstracted as the tank model to describe their working characteristics. Graphical techniques are widely used to assist in representing dynamic system models, while linear graphs represent the internal relationships between components in a system. According to the linear graph modeling theory, this paper takes the double-capacity water tank as the research object, and establishes the mathematical model of the tank liquid level control system. Then simulate the system on this basis, and the transfer function of the system is obtained based on the state space equation, the correctness of the transfer function is verified by the equivalent impedance method. The simulation results show that the modeling of linear graph theory can ensure that the model can better reflect the true characteristics of the system.

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Using Chinese characters to generate text-based passwords for information security

arXiv

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arXiv 2019年

作者： Yao, Bing Mu, Yarong Sun, Yirong Sun, Hui Zhang, Xiaohui Wang, Hongyu Su, Jing Zhang, Mingjun Yang, Sihua Zhao, Meimei Wang, Xiaomin Ma, Fei Yao, Ming Yang, Chao Xie, Jianming College of Mathematics and Statistics Northwest Normal University Lanzhou730070 China School of Information Engineering Lanzhou University of Finance and Economics Lanzhou730030 China College of Science Gansu Agricultural University Lanzhou730070 China School of Electronics Engineering and Computer Science Peking University Beijing100871 China Department of Information Process and Control Engineering Lanzhou Petrochemical College of Vocational Technology Lanzhou730060 China School of Mathematics Physics & Statistics Shanghai University of Engineering Science Shanghai201620 China Department of Mathematics Lanzhou City University Lanzhou730070 China School of Electronics and Information Engineering Lanzhou Jiaotong University Lanzhou730070 China

Graphical passwords (GPWs) are in many areas of the current world, in which the two-dimensional code has been applied successfully nowadays. Topological graphic passwords (Topsnut-gpws) are a new type of cryptography, and they differ from the existing GPWs. A Topsnut-gpw consists of two parts: one is a topological structure (graph), and one is a set of discrete elements (a graph labelling, or coloring), the topological structure connects these discrete elements together to form an interesting "story". It is not easy to remember passwords made up of longer bytes for many Chinese people. Chinese characters are naturally topological structures and have very high information density, especially, Chinese couplets form natively public keys and private keys in authentication. Our idea is to transform Chinese characters into computer and electronic equipments with touch screen by speaking, writing and keyboard for forming Hanzi-gpws (one type of Topsnut-gpws). We will translate Chinese characters into graphs (Hanzi-graphs), and apply mathematical techniques (graph labellings) to construct Hanzi-gpws, and next using Hanzi-gpws produces text-based passwords (TB-paws) with longer bytes as desired. We will explore a new topic of encrypting networks by means of algebraic groups, called graphic groups (Ablian additive finite group), and construct several kinds of self-similar Hanzi-networks, as well as some approaches for the encryption of networks, an important topic of researching information security. The stroke order of writing Chinese characters motivates us to study directed Hanzi-gpws based on directed graphs. We will introduce flawed graph labellings on disconnected Hanzi-graphs such that each Hanzi-gpw with a flawed graph labelling can form a set of connected Topsnut-gpws, like a group. Moreover, we introduce connections between different graphic groups that can be used to encrypt networks based on community partition. Copyright © 2019, The Authors. All rights reserved.

关键词： Graphic methods

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Performance Comparison of Load Frequency control for Power System by ADRC Approach and PID controller

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Journal of Physics: Conference Series 2020年第1期1510卷

作者： Mohammed. A. Abdalla Guotian Yang Congzhi Huang School of Control and Computer Engineering North China Electric Power University Beijing China Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power University Beijing China

Load Frequency control (LFC) is the main problem of power networks which outcomes because of mismatch between real power generation and consumption as the power consumption changes every period. therefore, the frequency of the power system may not be at rated value resulting in power quality problems. Hence, the aim of LFC is to reduce the transient changes of area frequency and tie-line power transfer maintaining them at steady state. Moreover, the external disturbances and uncertainty factors, as well as parameters of the power system, causes a big problem for controller design in LFC. Therefore, this research describes a comparative consideration for Active Disturbance Rejection control (ADRC) based LFC as an operational control strategy, which requires few information from the plant model and being robust against disturbances and uncertainties. Two intelligent controllers Particle Swarm Optimization (PSOA) Algorithm, Bacterial Foraging Optimization (BFO) mechanism are used for tuning Proportional Integral Derivative (PID) controller based LFC to acquire optimal values, taking into consideration single-area power system. The simulation results exhibit that the ADRC can obtain better performance than PID tuned by BFO and PSO in terms of frequency deviation and settling time.

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Resource allocation for device-to-device communications in multi-cell multi-band heterogeneous cellular networks

arXiv

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arXiv 2019年

作者： Chen, Yali Ai, Bo Niu, Yong He, Ruisi Zhong, Zhangdui Han, Zhu State Key Laboratory of Rail Traffic Control and Safety Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China University of Houston HoustonTX77004 United States Department of Computer Science and Engineering Kyung Hee University Seoul446-701 Korea Republic of

Heterogeneous cellular networks (HCNs) with millimeter wave (mm-wave) communications are considered as a promising technology for the fifth generation mobile networks. Mm-wave has the potential to provide multiple gigabit data rate due to the broad spectrum. Unfortunately, additional free space path loss is also caused by the high carrier frequency. On the other hand, mm-wave signals are sensitive to obstacles and more vulnerable to blocking effects. To address this issue, highly directional narrow beams are utilized in mm-wave networks. Additionally, device-to-device (D2D) users make full use of their proximity and share uplink spectrum resources in HCNs to increase the spectrum efficiency and network capacity. Towards the caused complex interferences, the combination of D2Denabled HCNs with small cells densely deployed and mm-wave communications poses a big challenge to the resource allocation problems. In this paper, we formulate the optimization problem of D2D communication spectrum resource allocation among multiple micro-wave bands and multiple mm-wave bands in HCNs. Then, considering the totally different propagation conditions on the two bands, a heuristic algorithm is proposed to maximize the system transmission rate and approximate the solutions with sufficient accuracies. Compared with other practical schemes, we carry out extensive simulations with different system parameters, and demonstrate the superior performance of the proposed scheme. In addition, the optimality and complexity are simulated to further verify effectiveness and efficiency. Copyright © 2019, The Authors. All rights reserved.

关键词： Heterogeneous networks

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Broadband Chaos Generation from Relaxation Oscillation-Free Polarization Mode of Vertical-Cavity Surface-Emitting Laser

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Guangxue Xuebao/Acta Optica Sinica 2025年第10期45卷

作者： Di, Chengzhen Liu, Qi Wang, Longsheng Zhao, Qingchun Guo, Yuanyuan Chang, Pengfa Jia, Zhiwei Wang, Anbang Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Shanxi Taiyuan030024 China College of Electronic Information and Optical Engineering Taiyuan University of Technology Shanxi Jinzhong030600 China Key Laboratory of Precision Measurement Physics Ministry of Shanxi Province Taiyuan University of Technology Shanxi Taiyuan030024 China School of Computer and Communication Engineering Northeastern University at Qinhuangdao Hebei Qinhuangdao066004 China Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education Guangdong University of Technology Guangdong Guangzhou510006 China

Objective Secure communication based on chaotic lasers has gained significant attention in recent years due to its high speed and compatibility with existing fiber-optic networks. Vertical-cavity surface-emitting lasers (VCSELs) are promising candidates, offering a compact structure and low power consumption. However, VCSELs are constrained by chaotic bandwidth limitations induced by relaxation oscillations, which reduce the secure transmission rate. Existing methods for broadening the chaos bandwidth often rely on complex external perturbations, which may hinder system synchronization. We propose a simplified method for generating broadband chaos by utilizing the relaxation-oscillation-free polarization mode of VCSELs. Methods We present a novel approach for generating broadband chaos by utilizing the relaxation-oscillation-free polarization mode of VCSELs. The experimental setup (Fig. 1) employs a custom single-mode VCSEL with a wavelength of 1550 nm and no internal isolator. The laser is powered by a low-noise current source and is equipped with precise temperature control to ensure stable operation. Optical feedback is provided via a fiber mirror, with its intensity regulated by a variable optical attenuator. Polarization controllers are used to align the feedback polarization, directing X mode feedback to the X mode and Y mode feedback to the Y mode. The output signals are separated into X+Y, X, and Y modes using polarization beam splitters. The spectral, temporal, and dynamic properties of the VCSEL are analyzed using an optical spectrum analyzer, a high-speed oscilloscope, and an electrical spectrum analyzer. Key parameters, including bias current and feedback strength, are systematically varied and optimized to investigate their effects on chaos generation, with the aim of identifying the optimal conditions for achieving broadband chaos with the desired characteristics. Results and Discussions We begin with an in-depth analysis of the free-running VCSEL to e

关键词： Optical feedback

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