检索结果-内蒙古大学图书馆

Blind users' assistive technology based on the Android platform

学校读者我要写书评

暂无评论

International Journal of Innovative Computing and Applications 2017年第3期8卷 162-171页

作者： Al-Nabulsi, Jamal Ma'touq, Jumana Abdallah, Emad E. Haloubi, Tarek Manasra, Ali Biomedical Engineering Department Faculty of Engineering Hashemite University Jordan Al-Ahliyya Amman University Amman19328 Jordan Institute of Automatic Control Leibniz Universität Hannover Germany Department of Computer Information System Faculty of Information Technology Hashemite University Jordan Biomedical Engineering Department Faculty of Engineering Al-Ahliyya Amman University Jordan

Because of the wide use of smartphones in our daily activities, a wide range of mobile applications have been developed to serve as assistive technologies. However, there is a lack of applications in the Arabic language to assist disabled people. The main aim of this paper is to build a simple yet accurate Arabic language application that is capable of helping blind users in real-Time. In the proposed technology, the blind user captures a photo and records his/her voice inquiry. The query is instantly sent with the captured photo to a set of volunteers. The volunteers answer the blind user enquiries and send the answers back. Fifteen visually impaired persons and ten volunteers were used in the experimental testing. The scenarios were carefully created based on realistic situations. The subjects were then asked to answer a questionnaire to test if their queries were answered effectively and efficiently. The early results are promising because all blind users found the proposed technology useful and 80% of them wanted to use it on a daily basis. In addition, all volunteers found the application easy to use with clear instructions and 80% of them were excited about using it to assist blind users. Copyright © 2017 Inderscience Enterprises Ltd.

关键词： Mobile computing

Resilient estimation and control on k-nearest neighbor platoons: A network-theoretic approach

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Pirani, Mohammad Hashemi, Ehsan Fidan, Baris Simpson-Porco, John W. Sandberg, Henrik Johansson, Karl Henrik Department of automatic control KTH Royal Institute of Technology Stockholm Sweden Department of Mechanical and Mechatronics Engineering University of Waterloo ONN2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo WaterlooON Canada

This paper is concerned with the networktheoretic properties of so-called k-nearest neighbor intelligent vehicular platoons, where each vehicle communicates with k vehicles, both in front and behind. The network-theoretic properties analyzed in this paper play major roles in quantifying the resilience and robustness of three generic distributed estimation and control algorithms against communication failures and disturbances, namely resilient distributed estimation, resilient distributed consensus, and robust network formation. Based on the results for the connectivity measures of the k-nearest neighbor platoon, we show that extending the traditional platooning topologies (which were based on interacting with nearest neighbors) to k-nearest neighbor platoons increases the resilience of distributed estimation and control algorithms to both communication failures and disturbances. Finally, we discuss how the performance of each algorithm scales with the size of the vehicle platoon. Copyright © 2018, The Authors. All rights reserved.

关键词： Motion compensation

Complex Issues in Regulator Designing

学校读者我要写书评

暂无评论

Complex Issues in Regulator Designing

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

Design of a UDE Frequency Selective Filter to Reject Periodical Disturbances

学校读者我要写书评

暂无评论

IFAC-PapersOnLine 2017年第1期50卷 7824-7829页

作者： Gadelovits S. Zhong Q.-C. Konstantopoulos G.C. Kadirkamanathan V. Department of Automatic Control and Systems Engineering The University of Sheffield Sheffield S1 3JD United Kingdom Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL 60616 United States

In this paper a new filter design for the Uncertainty and Disturbance Estimator (UDE) is proposed to reject periodical disturbances when a limited bandwidth is required for the control output. The motivation comes from several applications where the system actuator may introduce a bandwidth limitation, as a result of internal delays, or when the actuator itself is a limited bandwidth closed-loop system. When the traditional UDE approach is applied in these systems, the stability requirements impose a limitation over the effective bandwidth of the UDE filter and therefore disturbances cannot be fully rejected by the filter. In the case where the expected disturbance is periodical with a known fundamental frequency, the proposed UDE filter is designed as a chain of filters to match selected bands of the expected disturbance spectrum and fully reject them while maintaining the desired stability margins. A design example of a power inverter application is investigated and extensive simulation results are provided to verify the proposed UDE filter design. © 2017

关键词： disturbance estimator disturbance rejection limited bandwidth design power systems stability margins Uncertainty

A poincaré-bendixson theorem for hybrid systems

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Clark, William Bloch, Anthony Colombo, Leonardo Department of Mathematics University of Michigan 530 Church Street Ann ArborMI United States Department of Automatic Control School of Electrical Engineering and Computer Sciences KTH Royal Institute of Technology StockholmSE-100 44 Sweden

The Poincaré-Bendixson theorem plays an important role in the study of the qualitative behavior of dynamical systems on the plane;it describes the structure of limit sets in such systems. We prove a version of the Poincaré-Bendixson Theorem for two dimensional hybrid dynamical systems and describe a method for computing the derivative of the Poincaré return map, a useful object for the stability analysis of hybrid systems. We also prove a Poincaré-Bendixson Theorem for a class of one dimensional hybrid dynamical systems.34A38, 34C25, 34D20, 70K05, 70K20, 70K42 Copyright © 2018, The Authors. All rights reserved.

关键词： Hybrid systems

A decision-making framework for robust multi-agent systems in risky communication scenarios

学校读者我要写书评

暂无评论

A decision-making framework for robust multi-agent systems i...

AIAA Information Systems-AIAA Infotech at Aerospace, 2018

作者： Samiei, Arezoo Hu, Bin Zhao, Shiyu Sun, Liang Klipsch School of Electrical and Computer Engineering New Mexico State University Thomas & Brown Hall 1125 Frenger Mall Las CrucesNM88003 United States Department of Engineering Technology Old Dominion University Kaufman Hall 211C NorfolkVA23529 United States Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Department of Mechanical and Aerospace Engineering New Mexico State University Jett Hall Rm. 104 1040 S. Horseshoe Street Las CrucesNM88003 United States

ISBN: (数字)9781624105272

ISBN: (纸本)9781624105272

In this paper, we present a novel decision-making framework to characterize the communication status of a distributed multi-agent system. The theoretical package dropout probability (PDP) in communication is formulated as a function of the inter-distance between agents. A statistical representation is adopted to describe the actual value of the PDP. The communication status, formulated as a binary variable, is then determined by the comparison between the theoretical PDP and its statistical representation. To handle the unexpected degradation/loss of the communication network, an algorithm is proposed to quickly examine the robustness of the communication network in the case of single-node failure, i.e., the biconnectivity of a graph. The proposed framework is tested in scenarios of changing formation and temporary- and permanent-loss of communication. © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Multi agent systems

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

学校读者我要写书评

暂无评论

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

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

Optimal LQG control under delay-dependent costly information

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Maity, Dipankar Mamduhi, Mohammad H. Hirche, Sandra Johansson, Karl Henrik Baras, John S. Department of Electrical & Computer Engineering Institute for Systems Research University of Maryland United States Department of Automatic Control Royal Institute of Technology StockholmSE-100 44 Sweden Chair of Information-Oriented Control Technical University of Munich Arcisstraße 21 MünchenD-80290 Germany

In the design of closed-loop networked control systems (NCSs), induced transmission delay between sensors and the control station is an often-present issue which compromises control performance and may even cause instability. A very relevant scenario in which network-induced delay needs to be investigated is costly usage of communication resources. More precisely, advanced communication technologies, e.g. 5G, are capable of offering latency-varying information exchange for different prices. Therefore, induced delay becomes a decision variable. It is then the matter of decision maker's willingness to either pay the required cost to have low-latency access to the communication resource, or delay the access at a reduced price. In this article, we consider optimal price-based bi-variable decision making problem for single-loop NCS with a stochastic linear time-invariant system. Assuming that communication incurs cost such that transmission with shorter delay is more costly, a decision maker determines the switching strategy between communication links of different delays such that an optimal balance between the control performance and the communication cost is maintained. In this article, we show that, under mild assumptions on the available information for decision makers, the separation property holds between the optimal link selecting and control policies. As the cost function is decomposable, the optimal policies are efficiently computed. Copyright © 2018, The Authors. All rights reserved.

关键词： Decision making

Dispatchable Virtual Oscillator control for Decentralized Inverter-dominated Power Systems: Analysis and Experiments

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Seo, Gab-Su Colombino, Marcello Subotic, Irina Johnson, Brian Groß, Dominic Dörfler, Florian Power Systems Engineering Center National Renewable Energy Laboratory GoldenCO80401 United States Automatic Control Laboratory ETH Zurich Zurich8092 Switzerland Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States

—This paper presents an analysis and experimental validation of dispatchable virtual oscillator control (dVOC) for inverter-dominated power systems. dVOC is a promising decentralized control strategy that requires only local measurements to induce grid-forming behavior with programmable droop characteristics. It is dispatchable–i.e., the inverters can vary their power generation via user-defined power set-points and guarantees strong stability. To verify its feasibility, a testbed comprising multiple dVOC-programmed inverters with transmission line impedances is designed. With an embedded synchronization strategy, the dVOC inverters are capable of dynamic synchronization, black start operation, and transient grid voltage regulation with dynamic load sharing, and real-time-programmable droop characteristics for backward compatibility. All these features are experimentally verified. Copyright © 2018, The Authors. All rights reserved.

关键词： Synchronization