| 11. |
- Crnkovic, Ivica, et al.
(författare)
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Guest Editorial
- 2007
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Ingår i: Journal of Systems and Software. - : Elsevier BV. - 0164-1212 .- 1873-1228. ; 80:5, s. 641-642
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 12. |
- Crnkovic, Ivica, et al.
(författare)
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Preface
- 2011
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Ingår i: Lecture Notes in Computer Science, vol 6903. - : Springer. - 9783642237973
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 13. |
- Feljan, Juraj, et al.
(författare)
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Classification and survey of component models
- 2009
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- As component-based software engineering is growing and its usage expanding, more and more component models are developed. In this report we present a survey of software component models in which models are described and classified respecting the classification framework for component models proposed by CrnkoviA‡ et. al. [1]. This framework specifies several groups of important principles and characteristics of component models: lifecycle, constructs, specification and management of extra-functional properties, and application domain. This report analyzes a considerable amount of component models, including widely used industrial models, as well as research models.
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| 14. |
- Feljan, Juraj, 1985-
(författare)
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Task Allocation Optimization for Multicore Embedded Systems
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Modern embedded systems are becoming increasingly performance intensive, since, on the one hand, they include more complex functionality than before, and one the other hand, the functionality that was typically realized with hardware is often moved to software. Multicore technology, previously successfully used for general-purpose systems, is penetrating into the domain of embedded systems. While it does increase the performance capacity, it also introduces the problem of how to allocate software tasks to the cores of the hardware platform, as different allocations exhibit different extra-functional properties. An intuitive example is allocating too many tasks to a core --- the core will be overloaded and tasks will miss their deadlines.This thesis addresses the issue of task allocation in multicore embedded systems. The overall goal of the thesis is to advance the way soft real-time multicore systems are developed, by providing new methods and tools that enable deciding already at design-time which task to run on which core, with respect to a number of timing-related extra-functional properties. To achieve this goal, we developed a model-based framework for task allocation optimization. The framework uses model simulation in order to obtain performance predictions for particular task allocations. This in turn enables testing a large number of allocation candidates in search for one that exhibits good timing-related performance. Apart from defining and implementing the framework, three additional contributions are provided, each tackling a particular aspect of the framework: the influence of task allocation on communication duration is studied and interpreted in the context of design-time model-based analysis; a novel heuristic for guiding task allocation optimization is defined; and finally, a novel optimization method combining performance prediction and performance measurement is defined.
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| 15. |
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| 16. |
- Gaetana, Sapienza
(författare)
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Hardware/Software Partitioning Methodology for Embedded Applications using Multiple Criteria Decision Analysis
- 2016
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The new hardware technologies enable execution of embedded systems applications on heterogeneous execution platforms. These platforms consist of different execution processing units, for example of CPUs, and FPGAs, that enable the application execution of software (SW) components, typically implemented as C/C++ code, and hardware (HW) components, implemented as VHDL code. This heterogeneity enables building dedicated components which can significantly improve the application performance. This, however, requires decisions on which components will be implemented as SW and which as HW execution units. This decision process in known as HW/SW partitioning, and is a subject of research of more than 20 years. Typical goals of this research was to find the optimal partitioning with respect to the system performance, and possibly a couple of other properties such as power consumption, or resource utilization (e.g. related to CPU memory footprint and FPGA area). However, by significant increase in complexity of the applications, and inclusion of different requirements, the partitioning decisions become more complex, as well as the entire development process with an integrated partitioning decision process. Today there is a lack of a systematic approach for partitioning complex applications. This thesis addresses this challenge. The main objective of the thesis is to design and build a systematic partitioning decision process that includes many requirements of different types. The thesis describes a new method MULTIPAR that includes the partitioning decision process for component-based embedded systems. The method is based on model-based engineering principles; components are analysed as models which can be implemented either as a SW or HW components, and the implementation itself is performed at a late stage of the development process. The partition is based on the optimisation of the application’s and components’ extra-functional properties (EFPs) that are derived from the requirements and project constraints. For the optimization a Multiple Criteria Decision Analysis (MCDA) method is used. As a part of the main contribution, the thesis includes several independent contributions that are of a more general character: a) modeling principles for component-based applications which consists of SW and HW components, and a component can be implemented as SW or/and HW code; b) a classification and analysis of EFPs in respect to the dependency on their HW or SW implementation; c) composition rules for some of EFPs for SW and HW components; d) suitability and limitations of MCDA methods in their usage for the partitioning decisions. MULTIPAR is also implemented in a form of a tool that enables a selection of components and analysis of the system in respect to the selected EFPs. The feasibility of MULTIPAR was validated through two industrial cases. The thesis is organized in two parts; the first part includes an introduction summarizing the overall work and discussing the research approach, and the second part collect the most relevant papers published in different venues.
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| 17. |
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| 18. |
- Land, Rikard, et al.
(författare)
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A Quantitative Survey on Software In-house Integration
- 2006
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- As organizations merge or collaborate closely, an important question is how their existing software assets should be handled. If these previously separate organizations are in the same business domain - they might even have been competitors - it is likely that they have developed similar software systems. To rationalize, these existing software assets should be integrated, in the sense that similar features should be implemented only once.We have previously made qualitative observations on this topic. This report describes the follow-up study, which was performed in the form of a questionnaire aimed at validating and quantifying the previous observations. This report describes the research design, present the questionnaire together with all responses, and make some statistical analyses. This will form a basis for further publications with deeper analyses.
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| 19. |
- Land, Rikard, et al.
(författare)
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Integration of Software Systems : Process Challenges
- 2003
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Ingår i: Conference Proceedings of the EUROMICRO2003. - 9780769519968 ; , s. 413-416
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The assumptions, requirements, and goals of integrating existing software systems are different compared to other software activities such as maintenance and development, implying that the integration processes should be different. But where there are similarities, proven processes should be used. We analyze the process used by a recently merged company, with the goal of deciding on an integration approach for three systems. We point out observations that illustrate key elements of such a process, as well as challenges for the future.
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| 20. |
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