Utilization Control and Optimization of Real-time Embedded Systems
Author : Xue Liu
Publisher :
Page : pages
File Size : 42,82 MB
Release : 2015
Category : Embedded computer systems
ISBN : 9781680830637
Utilization Control and Optimization of Real-Time Embedded Systems
Author : Xue Liu
Publisher :
Page : 112 pages
File Size : 36,65 MB
Release : 2015-09-23
Category : Computers
ISBN : 9781680830620
Book Description
Real-time embedded systems have been widely deployed in mission-critical applications, such as avionics mission computing, highway traffic control, remote patient monitoring, wireless communications, navigation, etc. These applications always require their real-time and embedded components to work in open and unpredictable environments, where workload is volatile and unknown. In order to guarantee the temporal correctness and avoid severe underutilization or overload, it is of vital significance to measure, control, and optimize the processor utilization adaptively. A key challenge in this mission is to meet real-time requirements even when the workload cannot be accurately characterized a priori. Traditional approaches of worst-case analysis may cause underutilization of resources, while Model Predictive Control (MPC) based approaches may suffer severe performance deterioration when large estimation errors exist. To address this challenging problem and provide better system performance, we have developed several important online adaptive optimal control approaches based on advanced control techniques. Our approaches adopt Recursive Least Square (RLS) based model identification and Linear Quadratic (LQ) optimal controllers to guarantee that the systems are neither overloaded, nor underloaded. These proposed approaches, as well as the associated tools, can quickly adapt to volatile workload changes to provide stable system performance. To minimize the impact of modeling errors, we adopt the Adaptive Critic Design (ACD) technique and develop an improved solution that requires little information of the system model. To deal with the discrete task rates, we further propose to utilize the frequency scaling technique to assist the utilization control and optimization.
Real-Time Embedded Systems
Author : Meikang Qiu
Publisher : CRC Press
Page : 226 pages
File Size : 20,91 MB
Release : 2011-06-01
Category : Computers
ISBN : 1439817650
Book Description
Ubiquitous in today's consumer-driven society, embedded systems use microprocessors that are hidden in our everyday products and designed to perform specific tasks. Effective use of these embedded systems requires engineers to be proficient in all phases of this effort, from planning, design, and analysis to manufacturing and marketing.Taking a sys
Analysis, Design, and Optimization of Embedded Control Systems
Author : Amir Aminifar
Publisher : Linköping University Electronic Press
Page : 155 pages
File Size : 10,12 MB
Release : 2016-02-18
Category : Control systems
ISBN : 917685826X
Book Description
Today, many embedded or cyber-physical systems, e.g., in the automotive domain, comprise several control applications, sharing the same platform. It is well known that such resource sharing leads to complex temporal behaviors that degrades the quality of control, and more importantly, may even jeopardize stability in the worst case, if not properly taken into account. In this thesis, we consider embedded control or cyber-physical systems, where several control applications share the same processing unit. The focus is on the control-scheduling co-design problem, where the controller and scheduling parameters are jointly optimized. The fundamental difference between control applications and traditional embedded applications motivates the need for novel methodologies for the design and optimization of embedded control systems. This thesis is one more step towards correct design and optimization of embedded control systems. Offline and online methodologies for embedded control systems are covered in this thesis. The importance of considering both the expected control performance and stability is discussed and a control-scheduling co-design methodology is proposed to optimize control performance while guaranteeing stability. Orthogonal to this, bandwidth-efficient stabilizing control servers are proposed, which support compositionality, isolation, and resource-efficiency in design and co-design. Finally, we extend the scope of the proposed approach to non-periodic control schemes and address the challenges in sharing the platform with self-triggered controllers. In addition to offline methodologies, a novel online scheduling policy to stabilize control applications is proposed.
Analysis and Synthesis of Distributed Real-Time Embedded Systems
Author : Paul Pop
Publisher : Springer Science & Business Media
Page : 333 pages
File Size : 45,16 MB
Release : 2013-03-19
Category : Computers
ISBN : 1402028733
Book Description
Embedded computer systems are now everywhere: from alarm clocks to PDAs, from mobile phones to cars, almost all the devices we use are controlled by embedded computers. An important class of embedded computer systems is that of hard real-time systems, which have to fulfill strict timing requirements. As real-time systems become more complex, they are often implemented using distributed heterogeneous architectures. Analysis and Synthesis of Distributed Real-Time Embedded Systems addresses the design of real-time applications implemented using distributed heterogeneous architectures. The systems are heterogeneous not only in terms of hardware components, but also in terms of communication protocols and scheduling policies. Regarding this last aspect, time-driven and event-driven systems, as well as a combination of the two, are considered. Such systems are used in many application areas like automotive electronics, real-time multimedia, avionics, medical equipment, and factory systems. The proposed analysis and synthesis techniques derive optimized implementations that fulfill the imposed design constraints. An important part of the implementation process is the synthesis of the communication infrastructure, which has a significant impact on the overall system performance and cost. Analysis and Synthesis of Distributed Real-Time Embedded Systems considers the mapping and scheduling tasks within an incremental design process. To reduce the time-to-market of products, the design of real-time systems seldom starts from scratch. Typically, designers start from an already existing system, running certain applications, and the design problem is to implement new functionality on top of this system. Supporting such an incremental design process provides a high degree of flexibility, and can result in important reductions of design costs. STRONGAnalysis and Synthesis of Distributed Real-Time Embedded Systems will be of interest to advanced undergraduates, graduate students, researchers and designers involved in the field of embedded systems.
Embedded Computing Systems: Applications, Optimization, and Advanced Design
Author : Khalgui, Mohamed
Publisher : IGI Global
Page : 558 pages
File Size : 15,5 MB
Release : 2013-04-30
Category : Computers
ISBN : 1466639237
Book Description
Embedded computing systems play an important and complex role in the functionality of electronic devices. With our daily routines becoming more reliant on electronics for personal and professional use, the understanding of these computing systems is crucial. Embedded Computing Systems: Applications, Optimization, and Advanced Design brings together theoretical and technical concepts of intelligent embedded control systems and their use in hardware and software architectures. By highlighting formal modeling, execution models, and optimal implementations, this reference source is essential for experts, researchers, and technical supporters in the industry and academia.
Handbook of Real-Time and Embedded Systems
Author : Insup Lee
Publisher : CRC Press
Page : 798 pages
File Size : 20,56 MB
Release : 2007-07-23
Category : Computers
ISBN : 142001174X
Book Description
Real-time and embedded systems are essential to our lives, from controlling car engines and regulating traffic lights to monitoring plane takeoffs and landings to providing up-to-the-minute stock quotes. Bringing together researchers from both academia and industry, the Handbook of Real-Time and Embedded Systems provides comprehensive covera
Command-control for Real-time Systems
Author : Mohammed Chadli
Publisher : John Wiley & Sons
Page : 279 pages
File Size : 30,83 MB
Release : 2013-04-25
Category : Science
ISBN : 1118578953
Book Description
A real-time system is a complex system which is an integral part of an industrial or experimental system, a vehicle or a construction machine. The peculiarity of these systems is that they are driven by real-time targets in distributed environments. Command-control for Real-time Systems presents the calculation of correction for industrial systems of different physical natures, their implementation on real-time target industrial systems (PLC-SCADA, embedded systems with distributed networks, Networked Control Systems) and their validation by simulation. It optimizes industrial processes by the use of automatic tools, industrial computing and communications networks and aims to successively integrate new control laws (linear, nonlinear and fuzzy controllers) so that users can leverage the power of engineering science as an automatic service process optimization while maintaining their high maintainability facilities. Contents 1. Introduction. 2. Modeling Tools, Sébastien Cabaret and Mohammed Chadli. 3. Control Tools, Mohammed Chadli and Hervé Coppier. 4. Application to Cryogenic Systems, Marco Pezzetti, Hervé Coppier and Mohammed Chadli. 5. Applications to a Thermal System and to Gas Systems, Sébastien Cabaret and Hervé Coppier. 6. Application to Vehicles, Elie Kafrouni and Mohammed Chadli. 7. Real-time Implementation, Marco Pezzetti and Hervé Coppier. About the Authors Mohamed Chadli is a senior lecturer and research supervisor at the University of Picardie Jules Verne (UPJV) in France. His main research interests lie in robust control, the diagnosis and fault tolerant control of polytopic systems and applications for automobiles. He is a senior member of the IEEE, and Vice President of the AAI Club as part of SEE-France. He is the author/co-author of 3 books, book chapters and more than 100 articles published in international journals and conferences. Hervé Coppier is a lecturing researcher at ESIEE-Amiens in France. He has collaborated with industrialists in the field of automation and industrial computing, particularly with CERN, and has spearheaded various international European projects.
Behavioral Intervals in Embedded Software
Author : Fabian Wolf
Publisher : Springer Science & Business Media
Page : 207 pages
File Size : 45,31 MB
Release : 2013-03-14
Category : Computers
ISBN : 1475736495
Book Description
Behavioral Intervals in Embedded Software introduces a comprehensive approach to timing, power, and communication analysis of embedded software processes. Embedded software timing, power and communication are typically not unique but occur in intervals which result from data dependent behavior, environment timing and target system properties.
Optimal Design of Distributed Control and Embedded Systems
Author : Arben Çela
Publisher : Springer Science & Business Media
Page : 297 pages
File Size : 13,26 MB
Release : 2013-11-29
Category : Technology & Engineering
ISBN : 3319027298
Book Description
Optimal Design of Distributed Control and Embedded Systems focuses on the design of special control and scheduling algorithms based on system structural properties as well as on analysis of the influence of induced time-delay on systems performances. It treats the optimal design of distributed and embedded control systems (DCESs) with respect to communication and calculation-resource constraints, quantization aspects, and potential time-delays induced by the associated communication and calculation model. Particular emphasis is put on optimal control signal scheduling based on the system state. In order to render this complex optimization problem feasible in real time, a time decomposition is based on periodicity induced by the static scheduling is operated. The authors present a co-design approach which subsumes the synthesis of the optimal control laws and the generation of an optimal schedule of control signals on real-time networks as well as the execution of control tasks on a single processor. The authors also operate a control structure modification or a control switching based on a thorough analysis of the influence of the induced time-delay system influence on stability and system performance in order to optimize DCES performance in case of calculation and communication resource limitations. Although the richness and variety of classes of DCES preclude a completely comprehensive treatment or a single “best” method of approaching them all, this co-design approach has the best chance of rendering this problem feasible and finding the optimal or some sub-optimal solution. The text is rounded out with references to such applications as car suspension and unmanned vehicles. Optimal Design of Distributed Control and Embedded Systems will be of most interest to academic researchers working on the mathematical theory of DCES but the wide range of environments in which they are used also promotes the relevance of the text for control practitioners working in the avionics, automotive, energy-production, space exploration and many other industries.
