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International Conference on Electronics, computers and Artificial Intelligence (ECAI)

作者： Diana Popa Emil Simion Automatic Control and Computer Science University Politehnica of Bucharest

The impressive amount of recent technological advancements in the area of information systems have brought along, besides the multitude of positive aspects, some negative aspects too. The most obvious one is represented by the fact that the technological innovations are prone to various categories of threats. Making sure that information stays safe, unaltered and secret is an integral part of providing technology that behaves in the manner it is supposed to. Along with researching techniques of effectively securing the communication, other aspects that also deserve to receive attention are authentication, authorization and accounting. One security aspect that has been the most intensely researched in the past from the three, is authentication. From the various methods used in verifying the identity of users, one more recent one is biometrics that can significantly heighten the safety and security of a system. However, authenticating the user into an information system may not be entirely safe all the time. The aim of this paper is to present an overview of the different plausible methods of combining cryptography related concepts and biometrics techniques. This additional attachment of cryptography has proven to make the process of gaining access to an information system much more secure. The problem tackled in this paper will be presented from a two way perspective: on one hand, it will be discussed how biometrics can make use of cryptography-specific solutions in order to enhance its powers and, on the other hand, it will be presented how cryptography aspects can use the specific biometric data of a user to generate encryption keys that are much harder to decipher or to obtain. After this methods are presented, the theoretical basis for measuring performance of a biometric system will be presented and a survey on current performance results on fuzzy vault techniques will be enumerated and described.

关键词： Biometrics (access control) Encryption Databases Bioinformatics Transforms

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Partial Parallel Encoding and Algorithmic Construction of Non-Binary Structured IRA Codes

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China Communications 2016年第8期13卷 103-116页

作者： Wojciech Sulek Marcin Kucharczyk Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology

The non-binary(NB) Irregular Repeat Accumulate(IRA) codes, as a subclass of NB LDPC codes, potentially have an excellent error-correcting performance. They are also known to provide linear complexity of encoding, but the basic encoding method with the serial rate-1 accumulator significantly limits the encoder throughput. Then the objective of the research presented in this paper is to develop an encoding method pro- viding significantly increased throughput of an NB-IRA encoder altogether with a flexible code construction methods for the structured(S-NB-IRA) codes eligible for the proposed encoding method. For this purpose, we reformulate the classic encoding algorithm to fit into the partial parallel encoder architecture. We propose the S-NB-IRA encoder block diagram and show that its estimated throughput is proportional to the submatrix size of the parity check matrix, which guarantees a wide complexity- throughput tradeoff. Then, in order to facilitate the S-NB-IRA coding systems design, we present a computer search algorithm for the construction of good S-NB-IRA codes. The algorithm aims at optimizing the code graph topology along with selecting an appropriate non-binary elements in the parity check matrix. Numerical results show that the constructed S-NB-IRA codes significantly outperform the binary IRA and S-IRA codes, while their performance is similar to the best unstructured NB-LDPC codes.

关键词： channel coding LDPC codes non-binary LDPC IRA codes LDPC encoding LDPC encoder design

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Crash Detection Using IMU Sensors 21

Crash Detection Using IMU Sensors

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21st International Conference on control Systems and computer science, CSCS 2017

作者： Cismas, Alexandru Matei, Ioana Ciobanu, Vlad Casu, George Faculty of Automatic Control and Computer Science University Politehnica Bucharest Bucharest Romania Faculty of Military Electronic and Information Systems Military Technical Academy Bucharest Romania

ISBN: (纸本)9781538618394

More than 50% of the motorcycle accidents are fatal for the rider. 70% of those are due to the time needed for the emergency service to arrive at the accident. This leads us to a necessity in finding a device able to detect accidents. This document explains how to use the MPU6050 IMU sensor in an embedded device for measuring the Euler angles (roll, pitch, yaw) and also the G Forces on different axes. © 2017 IEEE.

关键词： Accidents

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Modelling the ignition system of combustion engines with two-port network 18

Modelling the ignition system of combustion engines with two...

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18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF 2017

作者： Rozowicz, Sebastian Kielce University of Technology Department of Electrical Engineering Automatic Control and Computer Science al. Tysiaȩclecia Państwa Polskiego 7 Kielce Poland

ISBN: (纸本)9781538616611

The aim of the paper is to develop a model of the ignition system for combustion engines with spark ignition described by two-port network equations. The mathematical calculations based on generalized parameters of a two-port network were used to develop the model. This allowed for the analysis of voltages and currents on the terminals of the model (without calculating voltages and currents inside the two-port network). The results of simulations for the developed model are presented. © 2017 IEEE.

关键词： Ignition systems

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Ensemble kalman filtering for online Gaussian process regression and learning

arXiv

引用

arXiv 2018年

作者： Kuzin, Danil Yang, Le Isupova, Olga Mihaylova, Lyudmila Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom Department of Electrical and Computer Engineering University of Canterbury Christchurch New Zealand Department of Engineering Science University of Oxford Oxford United Kingdom

Gaussian process regression is a machine learning approach which has been shown its power for estimation of unknown functions. However, Gaussian processes suffer from high computational complexity, as in a basic form they scale cubically with the number of observations. Several approaches based on inducing points were proposed to handle this problem in a static context. These methods though face challenges with real-time tasks and when the data is received sequentially over time. In this paper, a novel online algorithm for training sparse Gaussian process models is presented. It treats the mean and hyperparameters of the Gaussian process as the state and parameters of the ensemble Kalman filter, respectively. The online evaluation of the parameters and the state is performed on new upcoming samples of data. This procedure iteratively improves the accuracy of parameter estimates. The ensemble Kalman filter reduces the computational complexity required to obtain predictions with Gaussian processes preserving the accuracy level of these predictions. The performance of the proposed method is demonstrated on the synthetic dataset and real large dataset of UK house prices. Copyright © 2018, The Authors. All rights reserved.

关键词： Gaussian distribution

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Spray-on glass solution for fabrication silicon solar cell emitter layer

Spray-on glass solution for fabrication silicon solar cell e...

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作者： Filipowski, Wojciech Wrobel, Edyta Drabczyk, Kazimierz Waczynski, Krzysztof Kulesza-Matlak, Grazyna Lipinski, Marek Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland Institute of Electronics Silesian University of Technology Gliwice Poland Institute of Metallurgy and Materials Science Polish Academy of Science Krakow Poland

Purpose - The main aim of this study was a preparation development of dopant solution (DS) which can be deposited by a spray-on method and subsequently allows obtaining the no emitter layer with surface resistance in the range of 65-80 ω1. The intention of chosen spray-on method was to gain a cheaper way of dopant source deposition, compared to the commonly used methods, which is of particular importance for the new low-cost production processes. Design/methodology/approach - This paper presents the sequence in producing a spray-on glass solution (DS) with very high concentration of phosphorus, which allows to perform diffusion doping at relatively low temperatures. DS contained deionized water, ethyl alcohol, tetraethoxysilane and othophosphoric acid. Findings - The sequence in producing a DS was performed with respect to enabling the application to silicon wafers by spray-on method. Furthermore, the equations defined density and viscosity of DS in term of storage time were referred to determine the possibility of applying this solution by spray-on method. Besides, the dependence of the emitter surface resistance on the doping (diffusion) time was determined. Accordingly, optimal process conditions were specified. Originality/value - The paper presents a new, so far unpublished composition of DS with very high concentration of phosphorus, which can be applied using a spray-on method. Moreover, original are also investigations respecting some properties of obtained DS relative to storage time. © 2017 Emerald Publishing Limited.

关键词： Silicon solar cells

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Fuzzing the Linux Kernel

Fuzzing the Linux Kernel

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Computing Conference

作者： Costin Carabas Mihai Carabas Faculty of Automatic Control and Computer Science University "POLITEHNICA" of Bucharest

ISBN: (纸本)9781509054442

The development of Linux is one of the most prominent examples of free and open-source software collaboration. The kernel is used in many projects including Android which has over 82% in market share worldwide. Therefore, Linux's kernel security has a lot of impact on IT&C industry. This paper presents an audit solution over the Linux kernel in order to discover security vulnerabilities. Therefore, fuzzing campaigns are performed through system calls. This choice was made due to the fact that system calls are the natural way user space communicates with the kernel space and a real life scenario can be reproduced.

关键词： Security Fuzzing Linux Kernel

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Optimal weight allocation of dynamic distribution networks and positive semi-definiteness of signed laplacians

arXiv

引用

arXiv 2018年

作者： Wei, Jieqiang Johansson, Alexander Sandberg, Henrik Johansson, Karl H. Chen, Jie Department of Automatic control School of Electrical Engineering and Computer Science KTH Royal Institute of Technology StockholmSE-100 44 Sweden Department of Electronic Engineering City University of Hong Kong Hong Kong Hong Kong

In this paper, we consider the robustness of a basic model of a dynamical distribution network. In the first problem, i.e., optimal weight allocation, we minimize the H∞- norm of the dynamical distribution network subject to allocation of the weights on the edges. It is shown that this optimization problem can be formulated as a semi-definite program. Next we consider the semi-definiteness of the weighted graph Laplacian matrix with negative weights on the edges. A necessary and sufficient condition, using the effective resistance matrix, is established to guarantee the positive semi-definiteness of the Laplacian matrix. Furthermore, the bounded real lemma is derived for state-space symmetric systems. Copyright © 2018, The Authors. All rights reserved.

关键词： Laplace transforms

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Alternating iterative secure structure between beamforming and power allocation for UAV-aided directional modulation networks

arXiv

引用

arXiv 2018年

作者： Shu, Feng Lu, Zaoyu Lin, Jinyong Sun, Linlin Zhou, Xiaobo Liu, Tingting Zhang, Shuo Cai, Wenlong Lu, Jinhui Wang, Jin School of Electronic and Optical Engineering Nanjing University of Science and Technology 210094 China School of Computer and information Fujian Agriculture and Forestry University Fuzhou350002 China Beijing Aerospace Automatic Control Institute Beijing100854 China

In unmanned aerial vehicle (UAV) networks, directional modulation (DM) is adopted to improve the secrecy rate (SR) performance. Alice, a ground base station, behaves as a control center, and Bob is a UAV of flying along a linear flight trajectory who optimizes its SR performance by dynamically adjusting its beamforming vectors and power allocation (PA) strategy. Per fixed time interval during the Bob’s flight process, the transmit beamforming vectors for useful messages and AN projection are given by the rule of maximizing signal-to-leakage- and-noise ratio (Max-SLNR) and maximizing AN-and-leakage-to-noise ratio (ANLNR), and the optimal PA strategy is based on maximizing SR (Max-SR). More importantly, an alternating iterative structure (AIS) between beamforming and PA is proposed to further improve the SR performance. Simulation results show that the proposed AIS converges rapidly, and can achieve substantial SR gains over Max-SLNR plus Max-ANLNR with fixed PA such as PA factor β = 0.5, and 0.9. In particular, in the case of small-scale antenna array, the SR performance gain achieved by the proposed AIS is more attractive. Additionally, as the number of antennas tends to be large-scale, the average SR performance of the proposed AIS approaches an SR ceil. Copyright © 2018, The Authors. All rights reserved.

关键词： Beamforming

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Closed Loop Fault Detectability Based on a Gap-Metric

Closed Loop Fault Detectability Based on a Gap-Metric

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control Technology and Applications (CCTA),

作者： André Sekunda Steven Ding Niels Kjølstad Poulsen Henrik Niemann Department of Electrical Engineering Automation and Control Tech. University of Denmark Denmark Dept. of Automatic Control and Complex Systems University of Duisburg-Essen Duisburg Germany Dept. of Applied Mathematics and Computer Science Tech. University of Denmark Kgs. Lyngby Denmark

Systems are often controlled using feedback loops. Fault diagnosis schemes are usually designed assuming that there is no feedback loop. Therefore fault diagnosis methods need to accommodate for the feedback loop. One such method is active fault diagnosis based on a fault signature system. This method is derived using the YJBK parametrisation, named after Youla, Jabr, Bongiorno and Kucera. It uses the derived fault signature system to determine the detectability of possible faults in the system. Deriving the fault signature system requires knowledge about the controller. This paper demonstrates the possibility of estimating the detectability of faults in the fault signature system using a gap-metric. The gap-metric has the advantage of only requiring knowledge about the plant. By using the gap-metric it is possible to estimate the detectability of faults without using information about the controller.

关键词： Fault diagnosis Measurement Kernel Closed loop systems Fault detection Sensors

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