| 1. |
- Andersson, Martin, et al.
(författare)
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Co-simulation of Mobile Wireless Networked Embedded Systems in Physical Environments
- 2005
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Ingår i: RTiS 2005 – Proceedings of Real Time in Sweden 2005, the 8th Biennial SNART Conference on Real-Time Systems (Skövde University Studies in Informatics). - 1653-2325. - 9163173492 ; 2005:1
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Konferensbidrag (refereegranskat)abstract
- Embedded systems are becoming increasingly networked and aredeployed in application areas that require close interaction withtheir physical environment. Examples include distributed mobileagents and wireless sensor/actuator networks. The complexity ofthese applications make co-simulation a necessary tool during systemdevelopment. This paper presents a simulation environment thatfacilitates simulation of computer nodes and communication networksinteracting with the continuous-time dynamics of the real world.Features of the simulator include interrupthandling, task scheduling, wired and wireless communication, localclocks, dynamic voltage scaling, and battery-driven operation.Two simulation case studies are presented: a simple communicationscenario and a mobile robot soccer game.
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| 2. |
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| 3. |
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| 4. |
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| 5. |
- Aminifar, Amir, et al.
(författare)
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Control-Quality Driven Design of Cyber-Physical Systems with Robustness Guarantees
- 2013
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Ingår i: Design, Automation & Test in Europe (DATE 2013). - : IEEE. - 1530-1591. - 9781467350716 ; , s. 1093-1098
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Konferensbidrag (refereegranskat)abstract
- Many cyber-physical systems comprise several control applications sharing communication and computation resources. The design of such systems requires special attention due to the complex timing behavior that can lead to poor control quality or even instability. The two main requirements of control applications are: (1) robustness and, in particular, stability and (2) high control quality. Although it is essential to guarantee stability and provide a certain degree of robustness even in the worst-case scenario, a design procedure which merely takes the worst-case scenario into consideration can lead to a poor expected (average-case) control quality, since the design is solely tuned to a scenario that occurs very rarely. On the other hand, considering only the expected quality of control does not necessarily provide robustness and stability in the worst-case. Therefore, both the robustness and the expected control quality should be taken into account in the design process. This paper presents an efficient and integrated approach for designing high-quality cyber-physical systems with robustness guarantees.
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| 6. |
- Aminifar, Amir, et al.
(författare)
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Control-Quality Driven Design of Embedded Control Systems with Stability Guarantees
- 2018
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Ingår i: IEEE Design and Test. - : IEEE. - 2168-2356 .- 2168-2364. ; 35:4, s. 38-46
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Tidskriftsartikel (refereegranskat)abstract
- Today, the majority of control applications in embedded systems, e.g., in the automotive domain, are implemented as software tasks on shared platforms. Ignoring implementation impacts during the design of embedded control systems results in complex timing behaviors that may lead to poor performance and, in the worst case, instability of control applications. This article presents a methodology for implementation-aware design of high-quality and stable embedded control systems on shared platforms with complex timing behaviors.
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| 7. |
- Aminifar, Amir, et al.
(författare)
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Designing High-Quality Embedded Control Systems with Guaranteed Stability
- 2012
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Ingår i: 33rd IEEE Real-Time Systems Symposium (RTSS 2012. - 1052-8725. - 9781467330985
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Konferensbidrag (refereegranskat)abstract
- Many embedded systems comprise several controllers sharing available resources. It is well known that such resource sharing leads to complex timing behavior that degrades the quality of control, and more importantly, can jeopardize stability in the worst-case, if not properly taken into account during design. Although stability of the control applications is absolutely essential, a design flow driven by the worst-case scenario often leads to poor control quality due to the significant amount of pessimism involved and the fact that the worst-case scenario occurs very rarely. On the other hand, designing the system merely based on control quality, determined by the expected (average-case) behavior, does not guarantee the stability of control applications in the worst-case. Therefore, both control quality and worst-case stability have to be considered during the design process, i.e., period assignment, task scheduling, and control-synthesis. In this paper, we present an integrated approach for designing high-quality embedded control systems, while guaranteeing their stability.
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| 8. |
- Aminifar, Amir, et al.
(författare)
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Stability-Aware Analysis and Design of Embedded Control Systems
- 2013
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Ingår i: Proceedings of the International Conference on Embedded Software (EMSOFT), 2013. - : IEEE conference proceedings. - 9781479914432 - 9781479914425 ; , s. 1-10
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Konferensbidrag (refereegranskat)abstract
- Many embedded systems comprise several controllers sharing available resources. It is well known that such resource sharing leads to complex timing behavior that can jeopardize stability of control applications, if it is not properly taken into account in the design process, e.g., mapping and scheduling. As opposed to hard real-time systems where meeting the deadline is a critical requirement, control applications do not enforce hard deadlines. Therefore, the traditional real-time analysis approaches are not readily applicable to control applications. Rather, in the context of control applications, stability is often the main requirement to be guaranteed, and can be expressed as the amount of delay and jitter a control application can tolerate. The nominal delay and response-time jitter can be regarded as the two main factors which relate the real-time aspects of a system to control performance and stability. Therefore, it is important to analyze the impact of variations in scheduling parameters, i.e., period and priority, on the nominal delay and response-time jitter and, ultimately, on stability. Based on such an analysis, we address, in this paper, priority assignment and sensitivity analysis problems for control applications considering stability as the main requirement.
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| 9. |
- Andersson, Martin, et al.
(författare)
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Simulation of Wireless Networked Control Systems
- 2005
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Ingår i: Proceedings of the 44th IEEE Conference on Decision and Control and the 2005 European Control Conference. - 0780395689 ; , s. 476-481
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Konferensbidrag (refereegranskat)abstract
- Embedded systems are becoming increasingly networked and are deployed in application areas that require close interaction with their physical environment. Examples include distributed mobile agents and wireless sensor/actuator networks. The complexity of these applications make co-simulation a necessary tool during system development. This paper presents a simulation environment that facilitates simulation of computer nodes and communication networks interacting with the continuous-time dynamics of the real world. Features of the simulator include interrupt handling, task scheduling, wired and wireless communication, local clocks, dynamic voltage scaling, and battery-driven operation. Two simulation case studies are presented: a simple communication scenario and a mobile robot soccer game.
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| 10. |
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