| 1. |
- Fredriksson, Johan, et al.
(författare)
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Optimizing Resource Usage in Component-Based Real-Time Systems
- 2005
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Ingår i: Component-Based Software Engineering. - Berlin, Heidelberg : Springer. - 9783540258773 ; , s. 49-65
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Bokkapitel (refereegranskat)abstract
- The embedded systems domain represents a class of systems that have high requirements on cost efficiency as well as run-time properties such as timeliness and dependability. The research on component-based systems has produced component technologies for guaranteeing real-time properties. However, the issue of saving resources by allocating several components to real-time tasks has gained little focus. Trade-offs when allocating components to tasks are, e.g., CPU-overhead, footprint and integrity. In this paper we present a general approach for allocating components to real-time tasks, while utilizing existing real-time analysis to ensure a feasible allocation. We demonstrate that CPU-overhead and memory consumption can be reduced by as much as 48% and 32% respectively for industrially representative systems.
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| 2. |
- Fröberg, Joakim, 1970-
(författare)
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Engineering Automotive Electronic Systems: Decision Support for Successful Integration
- 2007
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The electronic system of a modern vehicle is essential to achieve a successful automotive product. Vehicle development is performed by integrating components that include embedded electronics from several suppliers.This thesis present results on the subject of integration of automotive electronic systems. Our studies aim at providing knowledge on how to integrate automotive electronic systems successfully in a setting where vehicles are developed based on existing platforms. We focus on early phases of automotive electronic system development and in particular on the decisions taken in integration of electronic sub-systems. The contribution is the presented support for making decisions to successfully integrate electronic systems for modern vehicles. The contribution includes an overview of driving factors of automotive electronics system design, a validated set of success practices for the integration of electronic components, and the proposal and demonstration of a decision model. The influential factors and the validated set of practices stems from case studies of products and projects while the proposed decision model is a result of combining two general models for architecture analysis and decision making, ATAM and AHP.We demonstrate that choices in strategy and design preceding integration are central to achieve a successful integration. Our studies show that problems arise from omitted strategy decisions and we provide a checklist for decision making in the areas; functionality, platform, integration design, and assigning responsibilities. We provide a recommendation that we validate in a multiple cases study where fulfillment of recommendations is demonstrated to affect project success in integration projects.The potential gain for OEMs using our results lies in achieving more solid foundations for design decisions. Designers and managers could potentially find central decisions on integration strategy early that, if omitted, could cause delays. Thus, applying the result could avoid pitfalls and enable successful integration projects.
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| 3. |
- Fröberg, Joakim, et al.
(författare)
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Key Factors for Achieving Project Success in Integration of Automotive Mechatronics
- 2007
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Ingår i: Journal of Innovations in Systems and Software Engineering. - : Springer Science and Business Media LLC. - 1614-5046 .- 1614-5054. ; 3:2, s. 141-155
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we present a multiple case study on integration of automotive mechatronic components. Based on the findings, we identify that the root causes of problems in integration are largely related to decisions omitted in electronic strategy.We present and recommend use of checklists defining key factors to address in order to achieve successful integration projects in terms of cost and quality. Our recommendations are defined by checklists for critical decisions in areas; functionality, platform, integration, and stakeholder involvement.The recommendations are established based on practitioner experience and then validated in a multiple case study. Five cases of integration are studied for different heavy vehicles in one company, and the fulfillment of our recommendations is measured. Finally we define project success criteria and we compare the level of fulfillment with the project success in terms of time plan and resource consumption.The main contribution of this study is the validated recommendations, each including a set of checkpoints that defines recommendation fulfillment. We also present defining characteristics to identify a high risk project. We provide a set of observable project properties and show how they affect project risk.
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| 4. |
- Åkerholm, Mikael, et al.
(författare)
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A Model for Reuse and Optimization of Embedded Software Components
- 2007
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Ingår i: Proceedings of the International Conference on Information Technology Interfaces, ITI. - 9789537138097 ; , s. 567-572
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In software engineering for embedded systems generic reusable software components must often be discarded in favor of using resource optimized solutions. In this paper we outline a modelthat enables the utilization of component-based principles even for embedded systems with high optimization demands. The model supports the creation of component variants optimized for different scenarios, through the introduction of an entrance preparation step and an ending verification step into the component design process. These activities are proposed to be supported by tools working on metadata associated with components, where the metadata is possible to automatically retrieve from many development tools. This paper outlines the theoretical model that is the basis for our current realization work.
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| 5. |
- Åkerholm, Mikael, et al.
(författare)
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Introducing Component Based Software Engineering at an Embedded Systems Sub-Contractor
- 2008
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Ingår i: PROCEEDINGS OF THE 34TH EUROMICRO CONFERENCE ON SOFTWARE ENGINEERING AND ADVANCED APPLICATIONS. - 9780769532769 ; , s. 59-67
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Attractive benefits with successful implementation of component-based principles include managing complexity, reduction of time-to-market, increased quality, and reusability. Deployment of component-based development is however not simple - it depends on many strategic, technical, and business decisions. In this paper we report experiences from our attempts with finding a correct implementation of component-based principles for the business situation of sub-contractors of embedded systems. Findings related to suitable component models, component technologies, and component management are presented. Overall the results confirm the suitability of component-based principles for the domain, but also show the need (and potential) in further development of CBSE theory and technology for embedded systems.
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| 6. |
- Åkerholm, Mikael, 1978-
(författare)
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Reusability of Software Components in the Vehicular Domain
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Component-based software engineering is concerned with enabling software to be assembled through systematic (re)use of carefully built software elements denoted components. In this thesis we describe how reusability benefits of component-based software engineering can be utilized for organizations acting in the vehicular domain. Attractive benefits with this approach include managing complexity through an architecture divided in components and avoidance of large monolithic structures; reduction of time-to-market since applications ideally can be assembled from pre-existing components; increased quality when applications are built from components already proven in use; and cost amortization through investment payoff by each reuse of a component. Successful deployment of component-based development is however not simple - it depends on many strategic, technical, and business decisions. Furthermore the domain of vehicular systems represents a class of systems where component-based principles have had a limited success, in comparison to the domain of PC applications where the approach has emerged. The major reason to this is a number of important qualities that leaven all through the software life-cycle, e.g., safety, reliability, timing, and resource efficiency. We have developed a prototype component technology tailored for the vehicular domain. The technology is based on a proposed component-model defining how component-based applications should be built and modelled in the context of vehicular systems. Our solution includes analysis tools and mechanisms supporting the process of maintaining important quality attributes in the life-cycle of software components. Furthermore, we have used the technology to develop a typical vehicular application, demonstrated its integration with a component repository for vehicular components, and also studied real cases to evaluate our results in cooperation with industry. The results confirm the suitability of component-based principles for the domain, and also show the potential in further development of component technologies for vehicular systems.
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