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Suppressing the endemic equilibrium in SIS epidemics: A state dependent approach

IFAC-PapersOnLine 2021年第15期54卷 163-168页

作者： Yuan Wang Sebin Gracy Hideaki Ishii Karl Henrik Johansson Division of Decision and Control Systems School of Electrical Engineering and Computer Science KTH Royal Institute of Technology and Digital Futures Stockholm Sweden Department of Computer Science Tokyo Institute of Technology Yokohama Japan

This paper considers the susceptible-infected-susceptible (SIS) epidemic model with an underlying network structure and focuses on the effect of social distancing to regulate the epidemic level. We demonstrate that if each subpopulation is informed of its infection rate and reduces interactions accordingly, the fraction of the subpopulation infected stays below half for all time instants. To this end, we first modify the basic SIS model by introducing a state dependent parameter representing the frequency of interactions between subpopulations. Thereafter, we show that for this modified SIS model, the spectral radius of a suitably-defined matrix being not greater than one causes all the agents, regardless of their initial sickness levels, to converge to the healthy state; assuming non-trivial disease spread, the spectral radius being greater than one leads to the existence of a unique endemic equilibrium, which is also asymptotically stable. Finally, by leveraging the aforementioned results, we show that the fraction of (sub)populations infected never exceeds half.

关键词： Epidemic processes Infection reduction Characterization of endemic equilibrium Suppressing endemic equilibrium

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Assessment of the effects of wind farms connected in a power system

Assessment of the effects of wind farms connected in a power...

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Power Tech Conference

作者： M.A.B. Amora U.H. Bezerra NESC-Nucleus of Engineering in Supervision and Control of Systems Department of Electrical and Computer Engineering Federal University of Para Belem Para Brazil Department of Electrical and Computer Engineering Federal University of Para Belem Para Brazil

In this work, the authors present the results of transient stability studies, which are accomplished when assessing the effects of the connection of wind farms in a power system. For the execution of those studies, a software environment for stability simulation was developed in MATLAB/sup TM/ with a friendly user interface, that allows the execution of different cases studies, e.g. sudden disconnection of the wind farm or part of the wind farm, operation under turbulent wind, operation under wind gust, short circuits in the network, loss of conventional generation and reduction of loads. Results of simulation studies are shown to illustrate the use of the software developed and to evaluate the effects on the stability of a test power system, of the integration of a wind farm into the electric grid.

关键词： Wind farms Power systems Power system stability Power system simulation Power system transients Circuit stability Circuit simulation MATLAB User interfaces Wind energy generation

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Iterative-analytic redundancy resolution scheme for a cable-driven redundant parallel manipulator

Iterative-analytic redundancy resolution scheme for a cable-...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Yousef B. Bedoustani Hamid D. Taghirad Advanced Robotics and Automated Systems (ARAS) Department of Systems and Control Faculty of Electrical and Computer Engineering Khaje Nasir Toosi University of Technology Tehran Iran

In this paper, redundancy resolution of a cable-driven parallel manipulator is solved by an iterative-analytic scheme. The method can be applied to all kind of redundant manipulators either parallel or serial with constraint caused through their dynamics. However, for sake of simulation the proposed method is implemented on a cable-driven redundant parallel manipulator (CDRPM). The redundancy resolution problem is formulated as a convex optimization with equality and non-equality constraints caused by manipulator structure and cables dynamics. Karush-Kuhn-Tucker theorem is used to analyze the optimization problem and to find an analytic solution. Subsequently, a tractable and iterative search algorithm is proposed to solve the redundancy resolution of such redundant mechanisms. Furthermore, it is shown through the simulation that, the elapsed time required to implement the analytical redundancy resolution scheme in a closed-loop structure is considerably less than that of other numerical optimization methods.

关键词： Redundancy Optimization Equations Actuators Manipulator dynamics Jacobian matrices

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A new watershed algorithm for protein spot detection in 2DGE images using the notion of fuzzy relations

A new watershed algorithm for protein spot detection in 2DGE...

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International Conference on computer Technology and Development (ICCTD)

作者： Shaheera Rashwan Talaat Faheem Amany Sarhan Bayumy A.B. Youssef Informatics Research Institute Mubarak City of Science and Technology Alexandria Egypt Computer Science and Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt

An important issue in the analysis of two-dimensional electrophoresis images is the detection and quantification of protein spots. The main challenges in the segmentation of 2DGE images are to separate overlapping protein spots correctly and to find the abundance of weak protein spots. To enable comparison of protein patterns between different samples, it is necessary to match the patterns so that homologous spots are identified. In this paper we describe a new robust technique to segment and model the different spots present in the gels. The watershed segmentation algorithm is modified to handle the problem of over segmentation by initially partitioning the image to mosaic regions using the composition of fuzzy relations. The experimental results showed the effectiveness of the proposed algorithm to overcome the over segmentation problem associated with the available algorithms.

关键词： Image segmentation Zinc Databases Pixel

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Multivariable fuzzy control for the simultaneous administration of the anaesthetic and the analgesic drugs

Multivariable fuzzy control for the simultaneous administrat...

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European control Conference (ECC)

作者： C. S. Nunes M. Mahfouf D. A. Linkens J. Peacock Department of Applied Mathematics University of Porto Porto Portugal Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom Anaesthetic Department Royal Hallamshire Hospital Sheffield United Kingdom

A multivariable fuzzy controller developed for the simultaneous administration of the anaesthetic drug (propofol) and the analgesic drug (remifentanil), is presented. The controller was designed in order to achieve a steady state level of depth of anaesthesia (DOA) and to reduce the amount of drug infused. The multivariable fuzzy controller is based on linguistic rules that interact with three decision tables, one of which represents a fuzzy PI controller. Optimisation using genetic algorithms was used to determine the scaling factors of the fuzzy PI controller. According to the different possibilities for the DOA level and for the surgical stimuli, the multivariable controller defines the required change in the infusion rates of the two drugs. A patient model remifentanil was used to test the multivariable controller. The controller was able to adjust the remifentanil infusion rate according to the stimulus intensity, and takes advantage of the synergistic interaction to the change adequately the propofol infusion rate. The multivariable fuzzy controller was tested under different simulations, and responded efficiently to different induction profiles, set point changes and disturbances.

关键词： Drugs Brain modeling Anesthesia Maintenance engineering Niobium Surgery Genetic algorithms

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Abstracting Linear Stochastic systems via Knowledge Filtering

Abstracting Linear Stochastic Systems via Knowledge Filterin...

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IEEE Conference on Decision and control

作者： M.H.W. Engelaar L. Romao Y. Gao M. Lazar A. Abate S. Haesaert Department of Electrical Engineering (Control Systems Group) Eindhoven University of Technology The Netherlands Department of Computer Science University of Oxford United Kingdom

In this paper, we propose a new model reduction technique for linear stochastic systems that builds upon knowledge filtering and utilizes optimal Kalman filtering techniques. This new technique will reduce the dimension of the noise disturbance and will allow any controller designed for the reduced model to be refined into a controller for the original stochastic system, while preserving any specification on the output. Although initially the reduced model will be time-varying, a method will be provided with which the reduced model can become time-invariant if it satisfies some minor technical conditions. We present our theoretical findings with an example that supports the proposed framework and illustrates how model reduction and controller refinement of stochastic systems can be achieved. We finish the paper by considering specific examples to analyze both completeness with respect to controller synthesis and model order reduction with respect to the state.

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On interpolation with units in H/sub /spl infin//

On interpolation with units in H/sub /spl infin//

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： B.M. Patre S.D. Agashe S. Jayakumar B. Bandyopadhyay Research Scholar Systems and Control Engineering Indian Institute of Technology Bombay India Department oi Electrical Engineering Indian Institute of Technology Bombay India Cranes software International (P) Limited Bangalore India Systems and Control Engineering IIT Bombay India Automatic Control Laboratory Ruhr University of Bochum Bochum Germany

The problem of finding a unit in H/sub /spl infin// i.e., an H/sub /spl infin// function the inverse of which is also H/sub /spl infin//, which interpolates to given points in the right-half plane has important applications in a number of feedback stabilization problems, i.e., strong stabilization (stabilization by a stable compensator) and simultaneous stabilization (finding a common fixed compensator which stabilizes a finite set of possible plants). The present paper gives an overview of the interpolation theory and some remarks observed with different mappings used in literature to find a unit in H/sub /spl infin//. A new algorithm is also presented to construct a unit in H/sub /spl infin//.

关键词： Interpolation control engineering Feedback Simultaneous localization and mapping Closed loop systems Hafnium Transfer functions Equations

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Efficient Approach for Face Detection in Video Surveillance

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Journal of Donghua University(English Edition) 2003年第4期20卷 52-55页

作者：宋红石峰 Department of Computer Science and Engineering Beijing Institute of Technology Beijing 100081 China Department of Computer Science and Engineering Beijing Institute of Technology Beijing 100081 Chinaecurity access control systems and automatic video surveillance systems are becoming increasingly important recently and detecting human faces is one of the indispensable processes. In this paper an approach is presented to detect faces in video surveillance. Firstly both the skin-color and motion components are applied to extract skin-like regions. The skin-color segmentation algorithm is based on the BPNN (back-error-propagation neural network) and the motion component is obtained with frame difference algorithm. Secondly the image is clustered into separated face candidates by using the region growing technique. Finally the face candidates are further verified by the rule-based algorithm. Experiment results demonstrate that both the accuracy and processing speed are very promising and the approach can be applied for the practical use.

Security access control systems and automatic video surveillance systems are becoming increasingly important recently,and detecting human faces is one of the indispensable *** this paper,an approach is presented to detect faces in video ***,both the skin-color and motion components are applied to extract skin-like *** skin-color segmentation algorithm is based on the BPNN (back-error-propagation neural network) and the motion component is obtained with frame difference ***,the image is clustered into separated face candidates by using the region growing ***,the face candidates are further verified by the rule-based *** results demonstrate that both the accuracy and processing speed are very promising and the approach can be applied for the practical use.

关键词： face detection skin-color segmentation BPNN frame difference region growing

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Introducing Digital controllers to Undergraduate Students using the TCLab Arduino Kit

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IFAC-PapersOnLine 2020年第2期53卷 17524-17529页

作者： P.B. de Moura Oliveira John D. Hedengren J.A. Rossiter INESC-TEC Department of Engineering University of Trás-os-Montes and Alto Douro (UTAD) Vila Real Portugal Department of Chemical Engineering Brigham Young University Provo UT USA Department of Automatic Control and Systems Engineering University of Sheffield S1 3JD UK

Many undergraduate engineering students have just a single introductory feedback control course in their study list. Often the curricula found in such courses is totally based on continuous time-domain classic control techniques. However, currently most control design techniques are implemented in digital machines. Thus, digital control concepts should be covered in introductory control courses. In this paper, the issue of how to implement and test digital industrial controllers is addressed. Teaching experiments based on the APMonitor temperature control lab (TCLab) are proposed. It will be shown that TCLab as an Arduino based portable kit, provides an excellent means to test digital controllers, as it is a compact and portable lab to be used by lecturers and students. While there are many low-cost and portable hardware options for teaching dynamics and control, a novel aspect of this paper is the digital control education methods that are validated with classroom experience, particularly with Biomedical and Bioengineering students. Preliminary results are presented.

关键词： On-off control PID control control engineering Education Arduino

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Spider monkey optimization (SMO): A novel optimization technique in electromagnetics

Spider monkey optimization (SMO): A novel optimization techn...

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IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： Ali A. Al-Azza Ammar A. Al-Jodah Frances J. Harackiewicz Electrical Engineering Department University of Basrah Basrah Iraq Department of Electrical and Computer Engineering SIUC Carbondale IL USA Control and Systems Engineering Department University of Technology Baghdad Iraq

Introducing and using the spider monkey optimization (SMO) as an optimization technique for the electromagnetics and antenna community is the main goal of this paper. The SMO is a new swarm intelligence technique which models the foraging behavior of spider monkeys. To show the efficiency of the SMO, different examples are presented in this work. The optimization procedure is used to synthesize the array factor of a linear antenna array and to optimally design a coaxial feeding patch antenna for wireless applications. The obtained results show that SMO is efficient in reaching the optimum solutions with few number of experiments.

关键词： Microwave antennas Decision support systems Linear antenna arrays Indexes Wireless communication Microwave propagation

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