Adaptive Embedded Systems - New Composed Technical Solutions for Feasible Low-Power and Real-time Flexible OS Tasks

Chniter, Hamza; Khalgui, Mohamed; Jarray, Fethi

doi:10.5220/0005066000920101

Cited by 3 publications

(9 citation statements)

References 16 publications

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“…A new technology known as DVS(Dynamic Voltage Scaling) [4] is integrated in the new processors for this purpose. Several studies have been performed in this context such as the work in [5], [6], [7], [8] to solve the scheduling problem in real-time systems. The real-time reconfigurable embedded systems are required to produce more flexible and adaptive solutions for a true real-time schedule under power constraints.…”

Section: State Of the Artmentioning

confidence: 99%

“…The proposed solutions in this middleware affect both the hardware part by acting in the processor speed during execution and the software part by changing the basic parameters of OS tasks such as deadlines and periods. In this paper, we try to expose the different steps from modeling to implementation to achieve a real-time middleware that presents a practical solution based on our approaches previously developed and presented in [5] and [6].…”

Section: State Of the Artmentioning

confidence: 99%

“…The results are presented in Table III. We apply to the same system, the model presented in [5]. The results are depicted in Table IV.…”

Section: Case Studymentioning

confidence: 99%

“…The system becomes infeasible because the factor of the CPU utilization is equal to U = 1.2909 ≥ 1. The solution presented in [5] tries to adjust the deadlines of tasks as a flexible solution to meet the corresponding requested constraints with a minimum energy consumption. The computational results are shown in Table VI.…”

Section: Case Studymentioning

confidence: 99%

“…The objective is to choose the suitable scaling factors for the processor speed to ensure the best compromise between the execution time and the energy consumption where all temporal constraints are respected. In this context, two combinatorial optimization solutions based on integer programming and heuristics have been developed and presented in [5] and [6]. The first exposes an integer programming model and an heuristic which tries to act to the processor speed during the execution of the OS tasks.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

New adaptive middleware for real-time embedded operating systems

Jarray

Chniter

Khalgui

2015

2015 IEEE/ACIS 14th International Conference on Computer and Information Science (ICIS)

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The paper presents a middleware implemented in Java, RT-MED, which corresponds to a software layer to be placed above the operating system. This software component is designed to execute and evaluate the performance, reliability and correctness of some real-time scheduling approaches which are theoretically validated. It describes a transition from the theory to the actual implementation of the proposed solutions. These solutions are based on a combinatorial optimization approach to solve the problem of feasibility in a system which is dynamically reconfigurable. RT-MED also presents a patch between the system and its environment under different constraints such as time and energy. It offers a set of adjustable parameters to control the flow of the execution. The middleware can be integrated into many operating systems and provides good quality both in terms of execution time and energy consumption. The implementation of this tool is based on java technology with embedded and real-time systems supported by the Real-Time Specification for Java. We have used a UML profile to describe various states and run-time reconfiguration of the embedded system. Results show that the middleware can effectively maintain the control and the stability of the system.978-1-4799-8679-8/15/$31.

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Section: State Of the Artmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

“…The results are presented in Table III. We apply to the same system, the model presented in [5]. The results are depicted in Table IV.…”

Section: Case Studymentioning

confidence: 99%

Section: Case Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

New adaptive middleware for real-time embedded operating systems

Jarray

Chniter

Khalgui

2015

2015 IEEE/ACIS 14th International Conference on Computer and Information Science (ICIS)

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Multi-Agent Adaptive Architecture for Flexible Distributed Real-Time Systems

Chniter

Khalgui

et al. 2018

IEEE Access

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On Reconfiguration Theory of Discrete-Event Systems: From Initial Specification Until Final Deployment

Khalgui

Mosbahi

2019

IEEE Access

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This paper presents an overview on different research activities that we did in the recent decade for developing reconfigurable discrete-event systems (RDESs) from initial high-level specification according to user requirements until final low-level deployment in target hardware components. A reconfiguration is any run-time scenario that adapts the system's behavior to any evolution in the related environment by adding or removing services or also configuring their parameters, i.e., their frequency, execution time, or also their location in the considered hardware architecture. Since the development of distributed RDESs under functional and extra-functional constraints is required by experts, we propose a complete methodology that deals first with their initial design with a new general profile named R-UML extending unified modeling language (UML) or also with new specific technology-oriented profiles, the validation of the related models with a new language R-OCL extending object constraint language (OCL), before their transformation to formal formalisms, such as Petri nets, timed automata, or B method for simulation or also formal verification of different properties. The checked models are transformed into OS reconfigurable tasks in the operational level, before applying a co-design methodology under functional, real-time, memory, and energy constraints for minimizing redundancies in tasks and for optimizing the composition of software and hardware parts together. We describe technology-oriented solutions for the scheduling of distributed RDESs by parameterizing tasks and their exchanged messages between multi-speed networked processors. We finish with the real low-level deployment on target hardware devices before applying useful software and hardware tests for checking the delivered system quality. These contributions, published in different journal and conference papers, are applied to different applications in medicine, wireless sensor networks, transportation systems, manufacturing industry, smart grids and microgrids, embedded technologies, and so on. We find significant gains in terms of the system reactivity and flexibility under related constraints. INDEX TERMS Discrete-event system, modeling and verification, design and validation, implementation and scheduling, real-time and energy aware scheduling, test and simulation, co-design and deployment, application. I. INTRODUCTION Automatic flexibility becomes a required criterion for dynamic system adaptability to any possible evolution in related environment. A reconfigurable system is considered in this paper as a discrete-event system (RDES) that adapts its behavior to recover faults or also improve required performance at run-time. It is a set of wired/wireless networked devices that run independent/dependent control software tasks exchanging messages on the network [1], [2]. These tasks and consequently the related messages should be executed under functional, memory, real-time, and energy constraints described in user requirements [3]-[5]. A reconfi...

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Adaptive Embedded Systems - New Composed Technical Solutions for Feasible Low-Power and Real-time Flexible OS Tasks

Cited by 3 publications

References 16 publications

New adaptive middleware for real-time embedded operating systems

New adaptive middleware for real-time embedded operating systems

Multi-Agent Adaptive Architecture for Flexible Distributed Real-Time Systems

On Reconfiguration Theory of Discrete-Event Systems: From Initial Specification Until Final Deployment

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