| 1. |
- Berling, Tomas, et al.
(författare)
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Efficient evaluation of multifactor dependent system performance using fractional factorial design
- 2003
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Ingår i: IEEE Transactions on Software Engineering. - 0098-5589. ; 29:9, s. 769-781
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Tidskriftsartikel (refereegranskat)abstract
- Performance of computer-based systems may depend on many different factors, internal and external. In order to design a system to have the desired performance or to validate that the system has the required performance, the effect of the influencing factors must be known. Common methods give no or little guidance on how to vary the factors during prototyping or validation. Varying the factors in all possible combinations would be too expensive and too time-consuming. This paper introduces a systematic approach to the prototyping and the validation of a system's performance, by treating the prototyping or validation as an experiment, in which the fractional factorial design methodology is commonly used. To show that this is possible, a case study evaluating the influencing factors of the false and real target rate of a radar system is described. Our findings show that prototyping and validation of system performance become structured and effective when using the fractional factorial design. The methodology enables planning, performance, structured analysis, and gives guidance for appropriate test cases. The methodology yields not only main factors, but also interacting factors. The effort is minimized for finding the results, due to the methodology. The case study shows that after 112 test Cases, of 1,024 possible, the knowledge gained was enough to draw conclusions on the effects and interactions of 10 factors. This is a reduction with a factor 5-9 compared to alternative methods.
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| 2. |
- Bratthall, Lars, et al.
(författare)
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Is it Possible to Decorate Graphical Software Design and Architecture Models with Qualitative Information? : An Experiment
- 2002
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Ingår i: IEEE Transactions on Software Engineering. - : IEEE. - 0098-5589 .- 1939-3520. ; 28:12, s. 1181-1193
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Tidskriftsartikel (refereegranskat)abstract
- Software systems evolve over time and it is often difficult to maintain them. One reason for this is often that it is hard to understand the previous release. Further, even if architecture and design models are available and up to date, they primarily represent the functional behaviour of the system. To evaluate whether it is possible to also represent some non-functional aspects, an experiment has been conducted. The objective of the experiment is to evaluate the cognitive suitability of some visual representations that can be used to represent a control relation, software component size and component external and internal complexity. Ten different representations are evaluated in a controlled environment using 35 subjects. The results from the experiment show that it representations with low cognitive accessibility weight can be found. In an example, these representations are used to illustrate some qualities in an SDL block diagram. It is concluded that the incorporation of these representations in architecture and design descriptions is both easy and probably worthwhile. The incorporation of the representations should enhance the understanding of previous releases and hence help software developers in evolving and maintaining complex software systems.
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| 3. |
- Caporuscio, Mauro, 1975-, et al.
(författare)
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Design and Evaluation of a Support Service for Mobile, Wireless Publish/Subscribe Applications
- 2003
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Ingår i: IEEE Transactions on Software Engineering. - : IEEE Press. - 0098-5589 .- 1939-3520. ; 29:12, s. 1059-1071
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents the design and evaluation of a support service for mobile, wireless clients of a distributed publish/subscribe system. A distributed publish/subscribe system is a networked communication infrastructure where messages are published by senders and then delivered to the receivers whose subscriptions match the messages. Communication therefore does not involve the use of explicit addresses, but rather emerges from the dynamic arrangement of publishers and subscribers. Such a communication mechanism is an ideal platform for a variety of Internet applications, including multiparty messaging, personal information management, information sharing, online news distribution, service discovery, and electronic auctions. Our goal is to support such applications on mobile, wireless host devices in such a way that the applications can, if they chose, be oblivious to the mobility and intermittent connectivity of their hosts as they move from one publish/subscribe access point to another. In this paper, we describe a generic, value-added service that can be used in conjunction with publish/subscribe systems to achieve these goals. We detail the implementation of the service and present the results of our evaluation of the service in both wireline and emulated wireless environments.
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| 4. |
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| 5. |
- Thelin, Thomas, et al.
(författare)
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An experimental comparison of usage-based and checklist-based reading
- 2003
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Ingår i: IEEE Transactions on Software Engineering. - 0098-5589. ; 29:8, s. 687-704
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Tidskriftsartikel (refereegranskat)abstract
- Software quality can be defined as the customers' perception of how a system works. Inspection is a method to monitor and control the quality throughout the development cycle. Reading techniques applied to inspections help reviewers to stay focused on the important parts of an artifact when inspecting. However, many reading techniques focus on finding as many faults as possible, regardless of their importance. Usage-based reading helps reviewers to focus on the most important parts of a software artifact from a user's point of view. This paper presents an experiment which compares usage-based and checklist-based reading. The results show that reviewers applying usage-based reading are more efficient and effective in detecting the most critical faults from a user's point of view than reviewers using checklist-based reading. Usage-based reading may be preferable for software organizations that utilize or will start utilizing use cases in their software development.
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