| 1. |
- Afzal, Wasif, et al.
(författare)
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Search-based prediction of fault-slip-through in large software projects
- 2010
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Ingår i: Proceedings - 2nd International Symposium on Search Based Software Engineering, SSBSE 2010. - : IEEE. - 9780769541952 ; , s. 79-88
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Konferensbidrag (refereegranskat)abstract
- A large percentage of the cost of rework can be avoided by finding more faults earlier in a software testing process. Therefore, determination of which software testing phases to focus improvements work on, has considerable industrial interest. This paper evaluates the use of five different techniques, namely particle swarm optimization based artificial neural networks (PSO-ANN), artificial immune recognition systems (AIRS), gene expression programming (GEP), genetic programming (GP) and multiple regression (MR), for predicting the number of faults slipping through unit, function, integration and system testing phases. The objective is to quantify improvement potential in different testing phases by striving towards finding the right faults in the right phase. We have conducted an empirical study of two large projects from a telecommunication company developing mobile platforms and wireless semiconductors. The results are compared using simple residuals, goodness of fit and absolute relative error measures. They indicate that the four search-based techniques (PSO-ANN, AIRS, GEP, GP) perform better than multiple regression for predicting the fault-slip-through for each of the four testing phases. At the unit and function testing phases, AIRS and PSO-ANN performed better while GP performed better at integration and system testing phases. The study concludes that a variety of search-based techniques are applicable for predicting the improvement potential in different testing phases with GP showing more consistent performance across two of the four test phases.
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| 2. |
- Bondesson, Lennart, 1944-, et al.
(författare)
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Probability calculus for silent elimination : A method for medium access control
- 2007
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- A probability problem arising in the context of medium access control in wireless networks is considered. It is described as a problem with n urns, each one having one ball at time 0. Each ball leaves its urn after a geometrically distributed time. Then there is a first time T such that no departures take place at the times T +1, T +2, . . . , T +k, where k is fixed. The focus is on the probability distribution of (XT , ST , T), where XT is the number of balls that leave their urns at time T and ST is the number of balls remaining there at that time. Efficient recursion formulas are derived. Asymptotics and continuous time approximations are considered. For k = ∞, T is the maximum of n geometrically distributed variables. This case has earlier got a large literature.
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| 3. |
- Engström, Emelie, et al.
(författare)
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An empirical evaluation of regression testing based on fix-cache recommendations
- 2010
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Ingår i: [Host publication title missing].
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Konferensbidrag (refereegranskat)abstract
- Background: The fix-cache approach to regression test selection was proposed to identify the most fault-prone files and corresponding test cases through analysis of fixed defect reports. Aim: The study aims at evaluating the efficiency of this approach, compared to the previous regression test selection strategy in a major corporation, developing embedded systems. Method: We launched a post-hoc case study applying the fix-cache selection method during six iterations of development of a multi- million LOC product. The test case execution was monitored through the test management and defect reporting systems of the company. Results: From the observations, we conclude that the fix-cache method is more efficient in four iterations. The difference is statistically significant at α = 0.05. Conclusions: The new method is significantly more efficient in our case study. The study will be replicated in an environment with better control of the test execution.efficiency of the regression testing based on these recommen- dations has not been evaluated earlier.
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| 4. |
- Nilsson, Thomas, et al.
(författare)
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A collision detection method for multicast transmissions in CSMA/CA networks
- 2007
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Ingår i: Wireless Communications & Mobile Computing. - : Wiley. - 1530-8669 .- 1530-8677. ; 7:6, s. 795-808
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Tidskriftsartikel (refereegranskat)abstract
- Compared to unicast traffic, multicast is not protected by any ARQ mechanism in 802.11 networks: collisions with other multicast and unicast transmissions are not detected and senders will not adapt to the contention situation by backing off. This results in an unreliable service for multicast transmissions. We propose early multicast collision detection (EMCD), an algorithm with the purpose of increasing the reliability of multicast transmissions in the MAC layer of an IEEE 802.11 network. A multicast sender using it will introduce an early pause in a transmission, perform a clear channel assessment (CCA), and if a collision is detected abort the transmission after a fixed time and schedule a retransmission. This allows for detecting collisions with both multicast and unicast transmissions but also adapting to the contention situation. A probabilistic analysis is provided showing that EMCD is more efficient than ordinary multicast and can be made even more efficient by tuning parameters.
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| 7. |
- Wikstrand, Greger, et al.
(författare)
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An Analysis of Success Factors for a Team-Project Software Development Course
- 2006
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Ingår i: Proceedings of the 19th Conference on Software Engineering Education and Training. ; , s. 95-102
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Konferensbidrag (refereegranskat)abstract
- Team project courses are important elements in most Computer Science and Software Engineering programs. For many students, the team project course represents the only non-trivial software development experience before graduation. The team project should be used to introduce them to important project and process issues that otherwise are very difficult to teach. Sloppy documentation, poor project planning and tracking or ineective communication will eventually affect the teams and teach the students a important lessons for their future work.In this paper, we investigate how students select, carry out and complete their projects. The results show that students tend to select mainstream projects with good specifications and that certain project types are less suitable for the course. The results also show that process related deliverables are crucial to the final outcome of the projects. Among the hardest, but also most important, deliverables we find the project plan.
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