| 1. |
- Andersson, Mattias, et al.
(författare)
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Reporting leadership patterns among trajectories
- 2007
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Ingår i: Proceedings of the 2007 ACM symposium on Applied computing. - New York, NY, USA : ACM. - 1595934804 ; , s. 3-7
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Konferensbidrag (refereegranskat)abstract
- Widespread availability of location aware devices (such as GPS receivers) promotes capture of detailed movement trajectories of people, animals, vehicles and other moving objects, opening new options for a better understanding of the processes involved. In this paper we investigate spatio-temporal movement patterns in large tracking data sets. We present a natural definition of the pattern 'one object is leading others', and discuss how such leadership patterns can be computed from a group of moving entities. The proposed definition is based on behavioural patterns discussed in the behavioural ecology literature. We also present several algorithms for computing the pattern, and they are analysed both theoretically and experimentally.
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| 2. |
- Gustafsson, Thomas, 1975-, et al.
(författare)
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Engineering Active Behavior of Embedded Software to Improve Evolution and Performance : an Aspect-Oriented Approach
- 2007
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Ingår i: The 22nd Annual ACM Symposium on Applied Computing,2007. - New York : ACM. - 1595934804
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Konferensbidrag (refereegranskat)abstract
- In this paper we propose a novel aspect-oriented scheme for implementing active behavior in embedded software with requirements on data freshness. The scheme improves system performance by combining active behavior in terms of event-condition-action (ECA) rules and on-demand updating. We design and implement the scheme in terms of aspects, thereby exploiting aspect-oriented programming technology to efficiently handle crosscutting nature of active behavior. The benefits of our approach are demonstrated using a case study of an embedded database system called COMET. Namely, simulations on the COMET database indicate that its performance increases by incorporating our scheme. Furthermore, using the COMET example we show that aspect-oriented implementation of active behavior has benefits when it comes to easier evolution of the system.
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| 3. |
- Höst, Martin, et al.
(författare)
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Different Conceptions in Software Project Risk Assessment
- 2007
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Ingår i: [Host publication title missing]. - New York, NY, USA : ACM. - 1595934804 ; , s. 1422-1426
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Konferensbidrag (refereegranskat)abstract
- During software project risk management, a number of decisions are taken based on discussions and subjective opinions about the importance of identified risks. In this paper, different people's opinions about the importance of identified risks are investigated in a controlled experiment through the use of utility functions. Engineering students participated as subjects in the experiment. Differences have been found with respect to the perceived importance, although the experiment could not explain the differences based on undertaken role in a development course.
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| 4. |
- Weyns, Kim, et al.
(författare)
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Sensitivity of Software System Reliability to Usage Profile Changes
- 2007
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Ingår i: The 22nd Annual ACM Symposium on Applied Computing. - New York, NY, USA : ACM. - 1595934804 ; , s. 1440-1444
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Konferensbidrag (refereegranskat)abstract
- Usage profiles are an important factor in software system reliability estimation. To assess the sensitivity of a system’s reliability to changes in the usage profile, a Markov based system model is used. With the help of this model, the statistical sensitivity to many independent changes can be estimated. The theory supports both absolute and relative changes and can be used for systems with or without a terminal state. With this approach it is possible to very quickly estimate the uncertainty on the predicted reliability calculated from a Markov model based upon the uncertainty on the usage profile. Finally the theory is applied to an example to illustrate its use and to show its validity.
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