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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 Originality/value - The paper presents a new, so far unpublished composition of DS with very high concentration of phosphorus, which can be applied using a spray-on method.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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Optimal weight allocation of dynamic distribution networks and positive semi-definiteness of signed laplacians

arXiv

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

arXiv

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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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Bayesian enhanced ensemble approach (BEEA) for time series forecasting

Bayesian enhanced ensemble approach (BEEA) for time series f...

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2018 IEEE Biennial Congress of Argentina, ARGENCON 2018

作者： Rivero, Cristian Rodriguez Pucheta, Julian Otano, Paula Juarez, Gustavo Franco, Leonardo Patino, Daniel Velazco, Raoul LIMAC-Laboratorio de Investigacion Matematica Aplicada A Control FCEFyN Universidad Nacional de Cordoba Argentina Departamento de Sistemas Universidad Tecnologica Nacional Argentina Artifitial Intelligence Laboratory FACET- Universidad Nacional de Tucuman Argentina Computer Science Department ETSI Informatics University of Malaga Spain Institute of Automatic INAUT Universidad Nacional de San Juan Argentina Laboratoire TIMA - CNRS GRENOBLE Cedex France

ISBN: (纸本)9781538650325

We propose a new ensemble forecasting method, Bayesian enhanced ensemble approach (BEEA), to model neural networks for time series forecasting. Motivated by looking to get better prediction algorithms, our proposed algorithm can effectively integrate the data from different methods modified by Bayesian learning. A dataset of univariate time series (seasonal and non-seasonal) is used to forecast short-long prediction horizons, mainly 3 and 18 out-of-sample. Comparative simulations of our method with ten existing linear and nonlinear forecasting approaches, namely, Energy associated to series (EAS), Energy associated to series modify by Renyis's entropy (EASmod), Bayesian approach (BA), Bayesian enhanced (BEA), Bayesian enhanced modified by Renyi's entropy (BEMA), Bayesian enhanced modified by relative entropy (BEAmod.) is presented. Relative advantages and limitations of the ensemble approach in contrast with some reported in the literature illustrates the effectiveness of the Bayesian enhanced ensemble approach (BEEA) through different forecasting horizons in both, the learning process and the validation test using the MASE, SMAPE and RMSE forecast error metrics to highlight the performance and limitations of the BEEA approach. © 2018 IEEE.

关键词： Neural network models

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Complex Issues in Regulator Designing

Complex Issues in Regulator Designing

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International Russian Automation Conference (RusAutoCon)

作者： Vadim A. Zhmud Wolfram Hardt Lubomir V. Dimitrov Hubert Roth Department of Automation Novosibirsk State Technical University Novosibirsk Russia Department of Computer Science Chemnitz University of Technology Chemnitz Germany Technical University of Sofia Sofia Bulgaria Department of Automatic Control Engineering University of Siegen Siegen Germany

ISBN: (纸本)9781538649398

The problem of control object with the use of feedback loop is extremely relevant, because only this method provides for the accurate control. It happened that the theory of automatic control paid much attention to the methods of regulators design based on mathematical transformations, using a mathematical model of the object. It describes the transformation of an input signal into an output signal inside the object. The methods were imperfect, so one of the following simplification methods was the most frequently used: the mathematical model of the object was simplified, or the calculations were carried out with approximation, for example, the oscillations in the system were studied by the amplitude and phase of the first harmonic only. Therefore, the result of using such regulators in practice did not exactly correspond to the theory provisions. To get mathematical and experimental basis of system developer tool, a solution of the elementary sub-problems was required. Among them there are tasks of the control of an object of the first and second order. Today the situation has changed. There is a means of sufficiently accurate mathematical modeling of the behavior of the system consisting of the loop with an object and a regulator. There are software and mathematical means for regulator calculating by the method of numerical optimization. Now there is sufficient software for calculating the regulators of the object, having a rather complex mathematical model. However, this did not change the situation. A lot of articles are still published, in which it is suggested performing additional fine tuning to achieve the required parameters after calculating the regulator and its technical implementation. Quite a big number of articles is still being published; they consider the methods of the empirical tuning of regulators based on the parameters of the transient process with a given fixed gain coefficient. This situation demonstrates insufficient using of the important t

关键词： Regulators Task analysis Cost function Mathematical model Numerical models Automation

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Fractional Differential Equation Solvers in Octave/Matlab

Fractional Differential Equation Solvers in Octave/Matlab

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International Conference on Methods and Models in Automation and Robotics

作者： Marcin Sowa Aleksandra Kawala-Janik Waldemar Bauer Faculty of Electrical Engineering Silesian University of Technology Gliwice Poland Faculty of Electrical Engineering Automatic Control and Informatics Opole University of Technology Opole Poland Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Kraków Poland

This paper concerns solvers for time fractional differential equations in Matlab and Octave. The main analysis revolves around a time step size adaptive solver basing on the numerical method called SubIval. The basis of SubIval is explained and formulae for the step size adaptivity are given. The solver is compared with others basing on: fractional linear multistep methods, product integration rules and the Grunwald-Letnikov approximation.

关键词： Fractional calculus Differential equations Electrical engineering Electronic mail Matlab Capacitors Coils

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Hybrid petri net model based decision support system

arXiv

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arXiv 2017年

作者： Culita, Janetta Caramihai, Simona Munteanu, Calin Politehnica" University of Bucharest Dept. of Automatic Control and Computer Science

It is well known that the complex system operation requires the use of new scientific tools and computer simulation. This paper presents a modular approach for modeling and analysis of the complex systems (in communication or transport systems area) using Hybrid Petri nets. The performance evaluation of the hybrid model is made by a simulation methodology that allows building up various functioning scenario. A Decision Support System based on the above mentioned methodologies of modeling and analysis will be designed for performance evaluation and time optimization of large scale communication and/or transport systems. Copyright © 2017, The Authors. All rights reserved.

关键词： Decision support systems

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VLAN-PSSR: Port-switching based Source Routing using VLAN tags in SDN data centers

UPB Scientific Bulletin, Series C: Electrical Engineering an...

引用

UPB Scientific Bulletin, Series C: Electrical Engineering and computer science 2017年第2期79卷 15-24页

作者： Poncea, Ovidiu Mihai Moldoveanu, Florica Asavei, Victor Dept of Computer Science and Engineering Faculty of Automatic Control and Computers University POLITEHNICA of Bucharest Romania

Source Routing allows a node in the path of a packet to specify partially or completely the route taken by that packet. The route is appended to packet header as a list of nodes to traverse, therefore making simple, stateless forwarding decisions. In this paper, we present a novel approach of Source Routing in SDN that uses stacked VLAN tags. Our solution was validated in Mininet using the Ryu controller and proven to have multiple advantages over other forwarding methods.

关键词： Mininet Networking SDN Source Routing VLAN

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