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Sökning: LAR1:gu > Blekinge Tekniska Högskola

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  • Afzal, Wasif, et al. (författare)
  • An experiment on the effectiveness and efficiency of exploratory testing
  • 2015
  • Ingår i: Empirical Software Engineering. - Springer. - 1382-3256. ; 20:3, s. 844-878
  • Tidskriftsartikel (refereegranskat)abstract
    • The exploratory testing (ET) approach is commonly applied in industry, but lacks scientific research. The scientific community needs quantitative results on the performance of ET taken from realistic experimental settings. The objective of this paper is to quantify the effectiveness and efficiency of ET vs. testing with documented test cases (test case based testing, TCT). We performed four controlled experiments where a total of 24 practitioners and 46 students performed manual functional testing using ET and TCT. We measured the number of identified defects in the 90-minute testing sessions, the detection difficulty, severity and types of the detected defects, and the number of false defect reports. The results show that ET found a significantly greater number of defects. ET also found significantly more defects of varying levels of difficulty, types and severity levels. However, the two testing approaches did not differ significantly in terms of the number of false defect reports submitted. We conclude that ET was more efficient than TCT in our experiment. ET was also more effective than TCT when detection difficulty, type of defects and severity levels are considered. The two approaches are comparable when it comes to the number of false defect reports submitted.
  • Afzal, Wasif, et al. (författare)
  • Prediction of faults-slip-through in large software projects: An empirical evaluation
  • 2014
  • Ingår i: Software quality journal. - 0963-9314. ; 22:1, s. 51-86
  • Tidskriftsartikel (refereegranskat)abstract
    • A large percentage of the cost of rework can be avoided by finding more faults earlier in a software test process. Therefore, determination of which software test phases to focus improvement work on has considerable industrial interest. We evaluate a number of prediction techniques for predicting the number of faults slipping through to unit, function, integration, and system test phases of a large industrial project. The objective is to quantify improvement potential in different test phases by striving toward finding the faults in the right phase. The results show that a range of techniques are found to be useful in predicting the number of faults slipping through to the four test phases; however, the group of search-based techniques (genetic programming, gene expression programming, artificial immune recognition system, and particle swarm optimization-based artificial neural network) consistently give better predictions, having a representation at all of the test phases. Human predictions are consistently better at two of the four test phases. We conclude that the human predictions regarding the number of faults slipping through to various test phases can be well supported by the use of search-based techniques. A combination of human and an automated search mechanism (such as any of the search-based techniques) has the potential to provide improved prediction results.
  • Afzal, Wasif, et al. (författare)
  • Towards benchmarking feature subset selection methods for software fault prediction
  • 2016
  • Ingår i: Computational Intelligence and Quantitative Software Engineering. - Springer-Verlag. - 978-3-319-25962-8 ; s. 33-58
  • Bokkapitel (övrigt vetenskapligt)abstract
    • Despite the general acceptance that software engineering datasets often contain noisy, irrele- vant or redundant variables, very few benchmark studies of feature subset selection (FSS) methods on real-life data from software projects have been conducted. This paper provides an empirical comparison of state-of-the-art FSS methods: information gain attribute ranking (IG); Relief (RLF); principal com- ponent analysis (PCA); correlation-based feature selection (CFS); consistency-based subset evaluation (CNS); wrapper subset evaluation (WRP); and an evolutionary computation method, genetic program- ming (GP), on five fault prediction datasets from the PROMISE data repository. For all the datasets, the area under the receiver operating characteristic curve—the AUC value averaged over 10-fold cross- validation runs—was calculated for each FSS method-dataset combination before and after FSS. Two diverse learning algorithms, C4.5 and na ??ve Bayes (NB) are used to test the attribute sets given by each FSS method. The results show that although there are no statistically significant differences between the AUC values for the different FSS methods for both C4.5 and NB, a smaller set of FSS methods (IG, RLF, GP) consistently select fewer attributes without degrading classification accuracy. We conclude that in general, FSS is beneficial as it helps improve classification accuracy of NB and C4.5. There is no single best FSS method for all datasets but IG, RLF and GP consistently select fewer attributes without degrading classification accuracy within statistically significant boundaries.
  • Aurum, Aybüke, et al. (författare)
  • Increasing the understanding of effectiveness in software inspections using published data sets
  • 2005
  • Tidskriftsartikel (refereegranskat)abstract
    • Since its inception into software engineering software inspection has been viewed as a cost-effective way of increasing software quality. Despite this many questions remain unanswered regarding, for example, ideal team size or cost effectiveness. This paper addresses some of these questions by performing an analysis using 30 published data sets from empirical experiments of software inspections. The main question is concerned with determining a suitable team size for software inspections. The effectiveness of different team sizes is also studied. Furthermore, the differences in mean effectiveness between different team sizes are investigated based on the inspection environmental context, document types and reading technique. It is concluded that it is possible to choose a suitable team size based on the effectiveness of inspections. This can be used as a tool to assist in the planning of inspections. A particularly interesting result is that variation in the effectiveness between different teams is considerably higher for certain types of documents than for others. Our findings contain important information for anyone planning, controlling or managing software inspections.
  • Berggren, Magnus, et al. (författare)
  • Analysis of how the noise level depends on different activities in a child day-care center
  • 2008
  • Ingår i: The 2008 Congress and Exposition of Noise Control Engineering, Inter-Noise, 2008 26-29 Oct, Shanghai, China. ; 5 pages
  • Konferensbidrag (refereegranskat)abstract
    • In child day-care centers the noise level can rise to high levels and in some cases become so high that the people present risk hearing damage. The purpose of this investigation was to study how the noise level depends on the different activities during the day. The study was performed at a child day-care center and 6 children and 5 adult female teachers participated. The participants had a microphone attached next to the ear connected to a wearable digital recorder. A total of 32.5 hours of data was recorded. By listening tests the recorded data could be sorted by activity and by number of people present in the same room as the test subject. Activities were classified as belonging to one of the following: outdoor activity, indoor play, singing, storytelling and gathering. Further, by listening, the data was classified in small group/large group (3 or less/more than 3). The results show that the average noise level (LAeq) for outdoor activity was the highest and was measured to 88.1 dBA (average over 7h52min). Singing was 81.5 dBA (1h26min), indoor play 81.3 dBA (19h21min), storytelling 76.6 dBA (1h09min) and gathering 75.0 dBA (2h44min). The noise level difference between all activities except between singing and indoor play and gathering and storytelling could be verified using t-test (p<0.001). Further, the results showed that the average noise level was 86.6 dBA (14h11min) for the large group and 79.6 dBA (18h21min) for the small group. This difference, of 7.0 dB was statistically validated (p<0.001) using t-test.
  • Berntsson Svensson, Richard, et al. (författare)
  • Prioritization of quality requirements: State of practice in eleven companies
  • 2011
  • Ingår i: 2011 IEEE 19th International Requirements Engineering Conference, RE 2011; Trento; 29 August 2011 through 2 September 2011. - 978-145770923-4 ; s. 69-78
  • Konferensbidrag (refereegranskat)abstract
    • Requirements prioritization is recognized as an important but challenging activity in software product development. For a product to be successful, it is crucial to find the right balance among competing quality requirements. Although literature offers many methods for requirements prioritization, the research on prioritization of quality requirements is limited. This study identifies how quality requirements are prioritized in practice at 11 successful companies developing software intensive systems. We found that ad-hoc prioritization and priority grouping of requirements are the dominant methods for prioritizing quality requirements. The results also show that it is common to use customer input as criteria for prioritization but absence of any criteria was also common. The results suggests that quality requirements by default have a lower priority than functional requirements, and that they only get attention in the prioritizing process if decision-makers are dedicated to invest specific time and resources on QR prioritization. The results of this study may help future research on quality requirements to focus investigations on industry-relevant issues.
  • Borgh, Markus, et al. (författare)
  • The effect of own voice on noise dosimeter measurements. A field study in a day-care center environment, including adults and children
  • 2008
  • Ingår i: The 2008 Congress and Exposition of Noise Control Engineering, Inter-Noise, 2008 26-29 Oct, Shanghai, China. ; 6 pages
  • Konferensbidrag (refereegranskat)abstract
    • Noise dosimeters are valuable tools in assessing the individual noise dose in the workplace. At non-industrial work places with a high degree of communication, such measurements would include the wearer’s own voice which would be registered as noise. This may not always be desirable. The purpose of this investigation was to study the effect of the wearers own voice in noise dosimeter measurements, and especially the difference between children and adults as test subjects. The study took place at a day-care center and sixteen children and thirteen adult female preschool teachers participated. The participants wore a digital recorder during the day, which recorded the sound signal and vibrations originating from an accelerometer attached to the neck of the test subjects, for distinguishing of whether the subject was speaking or not. Thus, average A-weighted noise levels with and without the influence of the subjects own voice could be obtained. The Leq for the measurements with and without the own voice was 84.6 dBA and 72.2 dBA for the children, respectively, and 79.3 dBA and 70.0 dBA for adults. Student’s t-test showed a significant (p<0.01) difference of 12.4 dBA for children and 9.3 dBA for adults when comparing measurements including and excluding the own voice and also that the difference was significantly larger for children. Thus, the study conclude that the influence from the own voice implied an augmentation of the Leq value and that there is a significant difference between children and adults in how large this augmentation is.
  • Edison, Henry, et al. (författare)
  • Towards innovation measurement in the software industry
  • 2013
  • Ingår i: Journal of Systems and Software. - Elsevier. - 0164-1212. ; 86:5, s. 1390-1407
  • Tidskriftsartikel (refereegranskat)abstract
    • In today's highly competitive business environments with shortened product and technology life cycle, it is critical for software industry to continuously innovate. This goal can be achieved by developing a better understanding and control of the activities and determinants of innovation. Innovation measurement initiatives assess innovation capability, output and performance to help develop such an understanding. This study explores various aspects relevant to innovation measurement ranging from definitions, measurement frameworks and metrics that have been proposed in literature and used in practice. A systematic literature review followed by an online questionnaire and interviews with practitioners and academics were employed to identify a comprehensive definition of innovation that can be used in software industry. The metrics for the evaluation of determinants, inputs, outputs and performance were also aggregated and categorised. Based on these findings, a conceptual model of the key measurable elements of innovation was constructed from the findings of the systematic review. The model was further refined after feedback from academia and industry through interviews.
  • Eiman Johansson, Maria, et al. (författare)
  • Nurses' clinical reasoning concerning management of peripheral venous cannulae
  • 2009
  • Ingår i: JOURNAL OF CLINICAL NURSING. - 0962-1067. ; 18:23, s. 3366-3375
  • Tidskriftsartikel (refereegranskat)abstract
    • Studien syftar till att beskriva sjuksköterskors kliniska resonemang vid skötsel av perifer venkateter. varje dag fattar sjuksköterskor en mängd beslut, bland annat om skötsel av PVK. En vanlig komplikation till PVK är tromboflebit, även om det också kan förekomma allvarligare komplikationer. Det finns kliniska riktlinjer om skötsel av PVK men dessa följs inte alltid. Tidigare studier om skötsel av PVK har inte genomförts i naturlig miljö. Därför designades en studie med kvalitativ metos som kombinerar observationer med intervjuer. Deltagande observation underlättade efterföljande öppna intervjuer om observationen, liksom de semistrukturerade intervjuerna om skötsel av PVK. texten analyserades med innehållsanalys. resultatet redovisas i tre huvudkategorier och ett tema. Temat visar att sjuksköterskorna balanserar mellan att minimera obehag för patienten och förebygga komplikationer från PVKn. Patientens välbefinnande övervägdes varje gång, även om det skedde med olika utgångspunkter t ex i form av den individuella patientsituationen, egen arbetsbelastning och egna erfarenheter av PVKskötsel. Denna typ av kunskap kan vara värdefull vid implementering av kliniska riktlinjer och också vid utbildning av sjuksköterskor.
  • Eiman Johansson, Maria, et al. (författare)
  • Registered nurses' adherence to clinical guidelines regarding peripheral venous catheters: a structured observational study.
  • 2008
  • Ingår i: Worldviews on Evidence-Based Nursing. - 1741-6787. ; 5:3, s. 148-59
  • Tidskriftsartikel (refereegranskat)abstract
    • Perifer venkateter är vanligt bland en stor del patienter idag. Användandet av perifer venkateter (PVK) kan leda till komplikationer som t ex tromboflebit och sepsis och kliniska riktlinjer har utarbetats för att stödja sjuksköterskor som handhar PVK. Det finns flera orsaker till varför kliniskt verksamma inte följer kliniska riktlinjer även om detta skulle minska komplikationsfrekvensen. Den här artikeln beskriver sjuksköterskors följsamhet till nationella och lokala kliniska riktlinjer vad gäller PVK och fokuserar på tid in situ, placering och dokumentaion vid förbandet. Ett ytterligare asyfte är att beskriva förekomsten av tromboflebiter i anslutning till PVK in situ, Metoden är strukturerade observationer av patienter med PVK. Data som analyserades gäller 343 PVK och är insamlat mellan december 2004 till juni 2005. Resultatet visar att sjuksköterskorna delvis följer riktlinjerna vad gäller storlek och placering. det var låg följsamhet vad gäller dokumentationen. icke följsamheten vad gäller tid in situ varierade mellan 5-26,3%, skillnader visade för storlek, placering och dokumentation. Mild tromboflebit (grad 1 och 2) observerades i 7% av fallen. Slutsatserna är att sjuksköterskors följsamhet till kliniska riktlinjer varierar men att sjuksköterskorna verkar byta leer ta bort PVK innan det uppstår alvarliga komplikationer. Återkoppling och diskussioner om följsamhet eller om komplikationer kan ha ett inflytande på sjuksköterskors kliniska beslutsfattande . Nyckelord: kliniskt beslutsfattande, följsamhet till riktlinjer, perifer venkateter, strukturerade observationer
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