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Stability of On-line Compensated Real-time Scheduled control Tasks

IFAC Proceedings Volumes 2001年第22期34卷 319-324页

作者： Pau Martí Ricard Villà Josep M. Fuertes Gerbard Fobler Dept. of Automatic Control Technical University of Catalonia Pau Gargallo 5 08028 Barcelona SPAIN Ph.: 34-3-4011679 Fax: 34-3-4017045 Dept. of Computer Engineering Mälardalen University PO Box 883 SE-721 23 Västerås SWEDEN

Real-time scheduling methods introduce various types of jitter in task instance execution. For real-time computer-controlled systems, the introduced sampling jitter and sampling-actuation delays may degrade the system performance and even lead to instability in the system. The degradation of the system performance can be compensated on-line by updating the controller parameters at each controller task instance execution, in what we call the compensation approach. In this paper we present stability analysis for controller tasks that perform the compensation approach.

关键词： Real-time computer systems Real-time tasks Scheduling algorithms Discrete-time systems Stability analysis

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A WSN Based Monitoring System for Oil and Gas Transportation through Pipelines

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IFAC Proceedings Volumes 2012年第6期45卷 1796-1801页

作者： Petru Junie Octav Dinu Cristian Eremia Dan Stefanoiu Catalin Petrescu Ioan Savulescu “Politehnica” University of Bucharest Dept. of Automatic Control & Computer Science 313 Splaiul Independentei Bucharest-060042 ROMANIA (Tel: +40-21-316-9561 Oil and Gas University of Ploiesti Dept. of Drilling and Extraction 39 Bucuresti Blvd. Ploiesti-100680 ROMANIA (Tel: +40-244-573-171

This article introduces some results obtained in monitoring of long pipelines employed in oil and gas transportation. A mobile unit for signals acquisition, processing, identification and diagnosis (MUSAPID), based on wireless sensors networks (WSN) technology was employed. The MUSAPID architecture was adapted to match the configuration of monitoring system, inspired by the national energy dispatcher. Thus, the system includes four hierarchical levels assigned to: the central dispatcher, the zonal dispatcher, the local dispatcher and the sensor nodes. The sensors are acquiring the flow and temperature of oil from the monitored pipeline. Sensors distribution along the pipeline is of in-line type. Nevertheless, a cross-link schema between sensor nodes is proposed, in order to increase the exploitation safety and to reduce false alarms sending. Two independent monitoring approaches based on comparison between values of sensors in pairs of successive nodes allow controlling the occurrence of rifts and leaks in the pipeline network. One of the approaches is unconventional and uses inter-correlation between the data acquired from two successive sensor nodes, as well as auto-correlation of temperature data. A simple logic to avoid sending false alarms was also implemented.

关键词： WSN topology oil and gas pipelines monitoring (cross-)correlation analysis

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A Neural Network Approach to Failure Decision of Adaptively controlled Systems

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IFAC Proceedings Volumes 1994年第8期27卷 605-610页

作者： K. Kumamaru K. Inoue S. Nonaka H. Ono T. Söderström Dept of Control Eng. and Sci. Faculty of Computer Science and Systems Eng. Kyushu Institute of Technology Iizuka 820 Fukuoka Japan Dept. of Automatic Control and Systems Analysis Institute of Technology. Uppsala Unit. P. O. Box 27 Uppsala. Sweden

In this paper, a combined method of change detection and failure decision is proposed for the system under the adaptive control based on the self-tuning regulator. The controlled system is assumed encounter unexpected parameter changes, which may be caused by a failure or a normal operation. Such a system change can effectively be detected by using Fullback Discrimination Information (KDI) as an index for model discrimination. In order to decide whether the detected system change is caused by a failure or not, a neural network approach to failure decision is introduced. Based on the knowledge about failure modes and system operations, the regulator parameter variations after the change detection are used as training data for the network learning. In this way an on-line monitoring scheme of adaptively controlled systems can be established. Simulation studies of a second-order damped oscillator have been earned out to demonstrate the effectiveness of the method.

关键词： Adaptive control failure diagnosis Fullback discrimination information neural network parameter estimation

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On the Reliability Degree of Hue and Saturation Values of a Pixel for Color Image Classification

On the Reliability Degree of Hue and Saturation Values of a ...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： S. Romani P. Sobrevilla E. Montseny Computer Engineering Math. Dept. Rovira I Virgili University Tarragona Spain Applied Mathematics Dept. Technical Univ. of Catalonia Barcelona Spain Comp. Eng. and Automatic Control. Dept. Technical Univ. of Catalonia Barcelona Spain

Variability of hue and saturation components is an important drawback for developing accurate color image segmentation algorithms based on HSI spaces: different colors can return similar color components because of the different illumination levels, and the components of a color change accordingly to the illumination level. To avoid these problems within color segmentation algorithms, we propose a method that, based on predicted hue and saturation deviations, provides the reliability degree of the H-S color components based obtained HIS values. The reliability degree has been used for improving color classification results

关键词： Pixel Color Lighting Colored noise computer vision Image segmentation Application software Humans Shadow mapping Reliability engineering

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Development of parallel manipulator sit to stand assistive device for elderly people

Development of parallel manipulator sit to stand assistive d...

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2013 IEEE Workshop on Advanced Robotics and Its Social Impacts, ARSO 2013

作者： Salah, Omar Asker, Ahmed Fath El-Bab, Ahmed M. R. Assal, Samy M. F. Ramadan, Ahmed A. Sessa, Salvatore Abo-Ismail, Ahmed Egypt-Japan University of Science and Technology New Borg-El-Arab city Alexandria Egypt Mechanical Engineering Department Faculty of Engineering Assiut University Egypt Department of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Alexandria Egypt Computer and Automatic Control Dept. Faculty of Engineering Tanta University Tanta Egypt Mechatronics and Robotics Dept. Egypt-Japan University of Science and Technology Egypt School of Creative Science and Engineering Waseda University Tokyo 168-8480 Japan

ISBN: (纸本)9781479923694

This paper describes a novel mobility assistive device under development in the Egypt-Japan University of Science and Technology (E-JUST). The proposed system can help patients who do not have enough physical strength on the lower limbs during sit to stand due to aging, diseases such as polymyositis and myopathy, and joint replacement surgery complications. It can follow the natural pattern of human motion during sit to stand providing assistance force under the shoulder. The overall device is compact and employees a parallel mechanism which provide more stiffness. Several experiments were carried out in a VICON room to calculate the human motion posture while sit to stand motion in addition estimate the trajectory of the end effector during assisting. computer simulation was built to verify the performance of the proposed system with the reference trajectory. © 2013 IEEE.

关键词： Mechanisms

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LMI based stability analysis and controller design for a class of 2D continuous-discrete linear systems

LMI based stability analysis and controller design for a cla...

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American control Conference (ACC)

作者： K. Galkowski W. Paszke B. Sulikowski E. Rogers D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland Dept. Electronics and Computer Science University of Southampton Southampton U.K. Dept Automatic Control and Systems Engineering University of Sheffield Sheffield U.K

Differential linear repetitive processes are a distinct class of 2D continuous-discrete linear systems of both applications and systems theoretic interest. In the latter area, they arise, for example, in the analysis of both iterative learning control schemes and iterative algorithms for computing the solutions of nonlinear dynamic optimal control algorithms based on the maximum principle. Repetitive processes cannot be analysed/controlled by direct application of existing systems theory and to date there are few results on the specification and design of control schemes for them. The paper uses an LMI setting to develop the first really significant results in this problem domain.

关键词： Stability analysis control systems Linear systems System testing Iterative algorithms automatic control Algorithm design and analysis Optimal control control engineering computing Design engineering

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A dynamic uplink scheduling scheme for WiMAX networks

A dynamic uplink scheduling scheme for WiMAX networks

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International Conference on computer Engineering and Systems

作者： Nada M. El-Shennawy Mohamed N. El-Derini Mostafa A. Youssef Mahmoud M. Fahmy Computers and Automatic Control Dept. Tanta University Tanta Egypt Computer Science and Engineering E-JUST Alexandria Egypt Vice Rector for Education and Student Affairs Pharos University Alexandria Egypt

Over the past few years, there has been a rapid growth of new services such as online video games, video conferences, and multimedia services to end users. WiMAX is an emerging technology for next generation wireless networks which supports a large number of users. To achieve Quality of Service (QoS) requirements, an efficient and reliable scheduling algorithm is urgently needed. Among a large number of the proposed approaches in the literature, a variably weighted round robin scheduling algorithm (VWRR) has been proven to provide the best performance in an IP backbone network with no attempts on WiMAX networks. This paper proposes a dynamic uplink scheduling algorithm for WiMAX networks based on VWRR to allocate the bandwidth to users to maximize the throughput and ensure the constraints of delay, jitter, and load. A comparative study between the proposed scheduling algorithm and the two most famous scheduling algorithms: weighted round robin algorithm (WRR) and modified deficit round robin algorithm (MDRR) over WiMAX networks, is presented. Simulation results obtained using OPNET reveal that the proposed algorithm has a superior performance compared with WRR with respect to throughput, delay, jitter, and load. Additionally, the proposed scheduling algorithm is shown to provide an excellent level of reliability and scalability when increasing the number of served subscriber stations.

关键词： WiMAX Uplink Quality of service Round robin Throughput Bandwidth

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Hybrid specification and implementation of an aircraft engine controller

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IFAC Proceedings Volumes 1999年第2期32卷 8734-8739页

作者： Julian M. Bass Mohamed S. Hajji Peter J. Fleming School of Electronic Engineering and Computer Systems University of Wales Bangor Dean Street Bangor Gwynedd UK Tel: + 44 (0)1248 382793 Fax: + 44 (0)1248 361429 Dept. of Automatic Control and Systems Engineering University of Sheffield UK

control of a gas-turbine engine requires management of continuous and discrete (state-event) behaviour. A design environment- the Development Framework, is used to define both the continuous and discrete aspects of a turbine engine controller. The approach uses purpose-built software translation tools to capture the system's specification from commercial simulation tools. A unified design model based on a data flow notation, comprising both continuous and state-event behaviour is automatically generated. Specification and design models of selected gas-turbine engine controller subsystems are presented. The complexity of the application suggests that the approach can be used for industrial scale projects.

关键词： continuous systems discrete-event systems design systems software specification software engineering

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Zero-Load: A Zero Touch Network based router management scheme underlying 6G-IoT ecosystems

Zero-Load: A Zero Touch Network based router management sche...

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

作者： Pronaya Bhattacharya Anwesha Mukherjee Sudeep Tanwar Emil Pricop Dept. of Computer Science and Engg. School of Eng. and Tech. Amity University Kolkata India Dept. of Computer Science Mahishadal Raj College Mahishadal West Bengal India Dept. of Computer Science and Engg. Inst. of Tech. Nirma University Ahmedabad India Automatic Control Comp. & Elect. Dept. Petroleum-Gas University of Ploiesti Ploiesti Romania

The rising data volumes force significant bottlenecks on the 6G for IoT (6G-IoT) network management functions, which limits the control, flexibility, and interoperability among devices, protocols, and end applications. Solutions like software-defined networking (SDN), and network function virtualization (NFV) are proposed with 6G, but the core management operations are still manual. Thus, to automatically upscale these 6G-IoT networks at reduced cost orchestration complexity, zero-touch networks (ZTN) are proposed. ZTN in 6G-IoT allows a high degree of automation and seamless integration of services. The article proposes a scheme, Zero-Load, that integrates ZTN at the core routing functionality of the 6G-IoT applications. We present a load balancing and traffic classification scheme through the ZTN networking stack for core routers. The ZTN router configuration fabric connects applications with the core services. Further, we present a Gaussian kernel-based support vector machine (SVM) classifier at the ZTN automation layer, which classifies the normal traffic and attack traffic. The proposed work is compared for parameters like mean time to response (MTTR), and resolution latency against baseline SDN and NFV schemes. Using ZTN, an average improvement of 32.45% is obtained in MTTR, and 87.89% in resolution latency (against a query). Using the Gaussian RBF kernel, an accuracy of 0.9914 is reported. These results indicate that ZTN-based management paves the way toward a more dense and intelligent 6G-IoT network.

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Weighted vector directional filters optimized by genetic algorithms

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5th International Conference on Parallel Processing and Applied Mathematics, PPAM 2003

作者： Lukac, Rastislav Smolka, Bogdan Swierniak, Andrzej Plataniotis, Konstantinos N. Venetsanopoulos, Anastasios N. Slovak Image Processing Center Jarkova 343 Dobsina049 25 Slovakia Department of Automatic Control Silesian University of Technology Akademicka 16 Str Gliwice44-101 Poland The Edward S. Rogers Sr. Dept. of Electrical and Computer Engineering University of Toronto 10 King’s College Road Toronto Canada

ISBN: (纸本)3540219463

This paper focuses on genetic optimization and filtering efficiency ofa recently developed class ofWeighted Vector Directional Filters (WVDFs), which minimize the aggregated weighted angular distances between the samples contained in a sliding filtering window. As shown in the paper, the proposed genetically optimized WVDFs hold excellent detail preserving characteristics and are able to remove impulsive noise affecting color images. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Impulse noise

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