| 1. |
- Behnam, Moris, et al.
(författare)
-
Real-Time Control and Scheduling Co-Design for Efficient Jitter Handling
- 2007
-
Ingår i: Proceedings - 13th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications. - 9780769529752 ; , s. 516-521
-
Konferensbidrag (refereegranskat)abstract
- Real-time control algorithms are designed based on thecharacteristics of the controlled plants and they require goodperformance without delays. However, digital control implementationtypically introduces delays and jitters due to insufficient CPUprocessing power and the limitations of the real-time schedulingmethod used. This can degrade the system performance or even make itunstable.In this paper we propose an integrated approach for control designand real-time scheduling, suitable for both discrete-time andcontinuous-time controllers. It guarantees system performance byaccepting a certain minimum value of jitter for control tasks andfeasibly schedules them together with other tasks in the system.Results from comparison with other approaches from real-time andcontrol theory domains underline the effectiveness of our method.
|
|
| 2. |
- Behnam, Moris, et al.
(författare)
-
Real-Time Control Design for Flexible Scheduling using Jitter Margin
- 2007
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Real-time control algorithms are designed based on the characteristics of the controlled plants and they require good performance without delays. However, digital control implementation typically introduces delays and jitters due to insufficient CPU processing power and the limitations of the real-time scheduling method used. This can degrade the system performance or even make it unstable. In this paper we propose an integrated approach for control design and real-time scheduling, suitable for both discrete-time and continuous-time controllers. It guarantees system performance by accepting a certain minimum value of jitter for control tasks and feasibly schedules them together with other tasks in the system. Results from comparison with other approaches from real-time and control theory domains underline the effectiveness of our method.
|
|
| 3. |
- Damir, Isovic, et al.
(författare)
-
THE COPRODUCTIVE UNIVERSITY : Education and research in coproduction with the wider community
- 2013
-
Konferensbidrag (refereegranskat)abstract
- Mälardalen University has a long history of a successful cooperation and coproduction with the industry and public sector in Sweden. This has eventually led it to become one of the leading higher education institutes in Sweden for excellent coproduction with different societal actors, both internationally and nationally. The university has through its coproduction activities become convinced of its value and of the wide range of opportunities it can bring to all parties involved. In this paper, we share our experience through some good examples both from research and education and discuss what is needed for successful and sustainable coproduction with industry and public sector.
|
|
| 4. |
- Hansson, Hans, et al.
(författare)
-
Real-Time Systems
- 2010
-
Bok (övrigt vetenskapligt/konstnärligt)abstract
- This is a textbook developed for use in the Master Programme Module E-M.6 "Real-Time Systems" as part of the Postgraduate Distance studies organized by Fraunhofer IESE and the Distance and International Studies Center at the Technical University of Kaiserslauten, Germany.
|
|
| 5. |
- Isovic, Damir
(författare)
-
A Web-based Platform for Distance Education
- 2006
-
Ingår i: Proceedings of the 4th IEEE CeTUSS Workshop, Uppsala, Sweden.
-
Konferensbidrag (refereegranskat)abstract
- We have developed a web-based platform for distance education. The platform supports efficient creation and maintenance of online distance courses, only requiring an Internet connection and a web browser from teachers and students. All tools that are necessary to run a distance course are integrated in the platform and accessible via a regular web browser, such as such as Internet Explorer, or Mozilla Firefox. This means that students and teachers can access the course from any computer with Internet connection, just as any other regular web page.After logging in to the course home page, teachers can easily create student accounts, upload their learning material, add course assignments, correct turned assignments, add news and FAQs, and much more, just by using a regular web browser, no other tools are needed. The similar applies for the students; they log in to their personal course account via the course home page, and once logged in, they can turn in their solutions to the course assignments and find corrected reports with grades and corrections done by the teacher.The platform has been successfully used in several courses at the Malardalen University. Its functions are continuously extended to cover diverse user's requirements.
|
|
| 6. |
- Isovic, Damir
(författare)
-
Flexible Media Processing in Resource Constrained Real-Time Systems
- 2006
-
Ingår i: Proceedings of the Eighth IEEE International Symposium on Multimedia (ISM 2006), San Diego, California, USA. - 9780769527468 ; , s. 363-370
-
Konferensbidrag (refereegranskat)abstract
- In this paper we propose real-time methods for flexible processing of MPEG-2 video in resource constrained systems. The video stream is adapted to resource fluctuations by using a quality-aware frame skipping approach which keeps the video frames that have the most impact on the overall video quality. Real-time admission control and resource reservation mechanisms ensure that video processing applications adapt Quality-of-Service at run-time according to current state of the system, while fully utilizing the available resources.
|
|
| 7. |
- Isovic, Damir, 1974-
(författare)
-
Flexible Scheduling for Media Processing in Resource Constrained Real-Time Systems
- 2004
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The MPEG-2 standard for video coding is predominant in consumer electronics for DVD players, digital satellite receivers, and TVs today. MPEG-2 processing puts high demands on audio/video quality, which is achieved by continuous and synchronized playout without interrupts. At the same time, there are restrictions on the storage media, e.g.., limited size of a DVD disc, communication media, e.g., limited bandwidth of the Internet, display devices, e.g., the processing power, memory and battery life of pocket PCs or video mobile phones, and finally the users, i.e., humans ability of perceiving motion. If the available resources are not sufficient to process a full-size MPEG-2 video, then video stream adaptation must take place. However, this should be done carefully, since in high quality devices, drops in perceived video quality are not tolerated by consumers.We propose real-time methods for resource reservation of MPEG-2video stream processing and introduce flexible scheduling mechanisms for video decoding. Our method is a mixed offline and online approach for scheduling of periodic, aperiodic and sporadic tasks, based on slot shifting. We use the offline part of slot shifting to eliminate all types of complex task constraints before the runtime of the system. Then, we propose an online guarantee algorithm for dealing with dynamically arriving tasks. Aperiodic and sporadic tasks are incorporated into the offline schedule by making use of the unused resources and leeways in the schedule. Sporadic tasks are guaranteed offline for the worst-case arrival patterns and scheduled online, where an online algorithm keeps track of arrivals of instances of sporadic tasks to reduce pessimism about future sporadic arrivals and improve response times and acceptance of firm aperiodic tasks. At runtime, our mechanism ensures feasible execution of tasks with complex constraints in the presence of additional tasks or overloads.We use the scheduling and resource reservation mechanism above to flexibly process MPEG-2 video streams. First, we present results from a study of realistic MPEG-2 video streams to analyze the validity of common assumptions for software decoding and identify a number of misconceptions. Then, we identify constraints imposed by frame buffer handling and discuss their implications on the decoding architecture and timing. Furthermore, we propose realistic timing constraints demanded by high quality MPEG-2 software video decoding. Based on these, we present a MPEG-2 video frame selection algorithm with focus on high video quality perceived by the users, which fully utilize limited resources. Given that not all frames in a stream can be processed, it selects those which will provide the best picture quality while matching the available resources, starting only such decoding, which is guaranteed to be completed. As a final result, we provide a real-time method for flexible scheduling of media processing in resource constrained system. Results from study based on realistic MPEG-2 video underline the effectiveness of our approach.
|
|
| 8. |
- Isovic, Damir, et al.
(författare)
-
Handling Mixed Task Sets in Combined Offline and Online Scheduled Real-Time Systems
- 2009
-
Ingår i: Real-time systems. - : Springer Science and Business Media LLC. - 0922-6443 .- 1573-1383. ; 43:3, s. 296-325
-
Tidskriftsartikel (refereegranskat)abstract
- Many industrial applications with real-time demands are composed of mixed sets of tasks with a variety of requirements. These can be in the form of standard timing constraints, such as period and deadline, or complex, e.g., to express application specific or non temporal constraints, reliability, performance, etc. Arrival patterns determine whether tasks will be treated as periodic, sporadic, or aperiodic. As many algorithms focus on specific sets of task types and constraints only, system design has to focus on those supported by a particular algorithm, at the expense of the rest. In this paper, we present a method to deal with a combination of mixed sets of tasks and constraints: periodic tasks with complex and simple constraints, soft and firm aperiodic, and in particular sporadic tasks. We propose the use of an offline scheduler to manage complex timing and resource constraints of periodic tasks and transform these into a simple EDF model with start-times and deadlines. On top of the offline schedule, sporadic tasks are guaranteed based on their worst-case activation frequencies. Then at run-time, an extension to EDF ensures feasible execution of tasks with complex constraints in the presence of additional tasks or overloads. It allows changes in the offline generated schedule to insert soft and firm aperiodic tasks by shifting the execution of offline scheduled tasks within their feasibility windows. Furthermore, the online algorithm uses the exact knowledge about sporadic arrivals to reduce the pessimism introduced by worst-case assumption, i.e., the resources unused by sporadic tasks are reclaimed to improve response times and acceptance of firm aperiodic tasks. A simulation study underlines the effectiveness of the proposed approach.
|
|
| 9. |
|
|
| 10. |
- Isovic, Damir, et al.
(författare)
-
Invited paper: Master Education in Collaboration with Industry
- 2009
-
Konferensbidrag (refereegranskat)abstract
- In this paper, we will present the collaboration between Malardalen University and the local industry in the context of our two master programs in computer science, Master in Software Engineering and Master in Intelligent Embedded Systems. Within both programs, there is an extensive cooperation with national giants such as ABB, Bombardier, Ericsson, SAAB and Volvo, as well as strategically important, high competence, SMEs. We will describe how we use our industrial partners to assure the quality and industrial relevance of our educational master programs. For example, they provide us sharp industrial equipment, give guest lectures at our courses, organize industrial visits, provide internships and theses for our students, and, whenever possible, give employment to our students. The education method that we use is Problem-Based Learning (PBL), which implies that large parts of the programs are performed in project form. The projects are supplied by our industrial partners, and are solved in collaboration with them. The aim with sharp industrial projects is to prepare students for work in industry directly after the completion of their education, and to make our students are highly competitive on the national and international job market, both in the industry as high-skilled expert and in the academia as researchers or PhD students.
|
|
