Continuous change and competition in the working environment necessitate increased efficiency and productivity which require different and enhanced skills and abilities. It is therefore important that the right people with the right skills are selected and employees are developed to enable them to meet the organisational and national demands of the future. This dissertation investigates the relationship between learning potential, English language proficiency and work-related training test results to establish why some production employees perform better on work-related training test results than others. The results indicate that there is no significant relationship between the work-related training test results and either learning potential or English language proficiency. There is, however, a significant correlation between learning potential and English language proficiency. It might be worthwhile exploring the availability and adequacy of assessors as well as the motivational level of the production employees as factors that influence the progress made with work-related training test results. / Industrial and Organisational Psychology / MCOM (Industrial Psychology)

No description available.

Die vorliegende Arbeit verfolgte die Zielstellung der Substitution des etablierten Weißmetalls als Laufschicht von hydrodynamischen Mehrflächengleitlagern durch neuartige Kunststoffschichten. Dazu wurden vergleichende Bauteilversuche an Mehrflächengleitlagern mit verschiedenen Laufschichten und Bohrungsformen vorgenommen. Eine Zinnbasislegierung als Laufflächenbeschichtung diente dabei als Referenzwerkstoff. Zur Durchführung des Versuchsprogrammes kam ein vorhandener, messtechnisch neu konditionierter Turbinenlagerprüfstand zum Einsatz. Die Versuchsreihen haben durchweg positive Beurteilungen der Lagerkennwerte im untersuchten Betriebsbereich der neuen Lagervarianten ergeben. Die neuartigen Laufschichtvarianten erfüllten die hohen tribologischen und thermischen Anforderungen. Einzelne Abweichungen der ermittelten Kennwerte wurden zahlenmäßig dokumentiert und können mit bereits verfügbaren physikalischen Modellen beschrieben werden. Die Ergebnisse erwiesen sich als unabhängig von der Lagerbauform aber abhängig von der gewählten Schichtvariante. Die Untersuchungen zum Betriebsverhalten unter hydrodynamischer Dauerbelastung sowie im Mischreibungsgebiet und im Notlaufbetrieb führten zu teilweise unterschiedlichen Ergebnissen. Im Mischreibungsgebiet wiesen die untersuchten Lager kaum Unterschiede im Betriebsverhalten auf. Im Dauerversuch zeigten die Lager mit Weißmetall, Gleitlack und Keramikschicht hervorragende Eigenschaften. Die Variante Klüberplast besaß eine ungenügende Bindefestigkeit und führte zu plastischen Verformungen der Schicht infolge der hydrodynamischen Drücke. Im Notlaufbetrieb übertrafen die untersuchten Kunststoffvarianten die Standzeiten des Referenzwerkstoffs Weißmetall. / The aim of this study was to identify and test an alternative liner material instead of common liner materials such as white alloy for multi-lobe radial bearings. For this purpose comparative tests with different radial bearings were carried out. The white alloy material was taken as a reference. In preparation for these test series, the measurement system of the turbine bearing test rig was upgraded. Experiments showed beneficial performances of the bearings with a plastic liner by evaluating the static and dynamic properties of different bearing geometries and liner thicknesses under a wide range of operating conditions. The new bearings fulfilled the high tribological and thermal requirements. Observed deviations of the determined parameters were documented in number and can be described with available physical models. The results were independent of the bearing type and depending on the selected liner material variant. The studies on operating performance in continuous operation in the mixed friction area and in dry running operation led to partially different results. The mixed friction tests showed little difference in the examined stock performance. The bearings with white alloy, ceramic layer and bonded coating showed excellent fatigue properties of long-term experiment. On Klüberplast insufficient bonding strength and plastic deformation of the layer due to the hydrodynamic pressure was found. In the dry running operation the investigated polymers exceeded the lifetime of the referencematerial white alloy.

Continuous change and competition in the working environment necessitate increased efficiency and productivity which require different and enhanced skills and abilities. It is therefore important that the right people with the right skills are selected and employees are developed to enable them to meet the organisational and national demands of the future. This dissertation investigates the relationship between learning potential, English language proficiency and work-related training test results to establish why some production employees perform better on work-related training test results than others. The results indicate that there is no significant relationship between the work-related training test results and either learning potential or English language proficiency. There is, however, a significant correlation between learning potential and English language proficiency. It might be worthwhile exploring the availability and adequacy of assessors as well as the motivational level of the production employees as factors that influence the progress made with work-related training test results. / Industrial and Organisational Psychology / MCOM (Industrial Psychology)

No description available.

This thesis presents an in-depth exploration of regression testing metrics and their relationship with software quality, based on a qualitative case study within a global technology organization. By applying a thematic analysis to empirical data collected through interviews and a survey with the organisations Quality and Assurance team, this study identifies three primary themes: foundation of credibility, organic test maintenance, and defect management. The research highlights key metrics underlying each theme, including requirement coverage, code coverage, historical pass-rate, test flakiness, and code complexity. These metrics, especially when implemented in the early stages of a project, emerged as indicative of the overall software quality and stability. Through this research, a deeper understanding of regression testing metrics and their critical role in increasing the software quality is achieved. However, it is apparent that further research is necessary, including broader case studies, investigation into the application of machine learning algorithms, and exploration of additional metrics, to fully understand their universal applicability. The insights in the findings from this thesis are aimed at contributing to the field of software quality assurance academically and also provide actionable insights to industry professionals in the field of software quality. / Denna avhandling presenterar en djupgående utforskning av regressionstestnings metriker och deras relation till programvarukvalitet, baserat på en kvalitativ fallstudie hos en global organisation aktiv inom teknologi. Genom att tillämpa en tematisk analys på empirisk data insamlad genom intervjuer och en enkätundersökning, identifierar denna studie tre huvudteman: testtillförlitlighet, testunderhåll och testprestanda. Forskningen lyfter fram nyckelmetriker som ligger till grund för varje tema. Dessa inkluderar ”Requirement coverage”, ”Code coverage, ”Historic pass-rate” , ”Test flakiness” och ”Code complexity”. Dessa metriker, särskilt när de implementeras i de tidiga stadierna av ett projekt, framträdde som indikativa för den övergripande programvarukvaliteten och programvarustabiliteten. Genom denna forskning uppnås en djupare förståelse för regressionstestningens metriker och deras kritiska roll i en ökad programvarukvalitet. Det är dock uppenbart att ytterligare forskning behövs, inklusive bredare fallstudier, undersökning av tillämpningen av maskininlärningsalgoritmer och utforskning av ytterligare metriker, för att fullt ut förstå deras universella användningsområden. Insikterna i resultaten från denna avhandling syftar till att bidra till fältet för regressionstestning akademiskt och även ge praktiska insikter till yrkesverksamma inom programvarukvalitet.

This thesis deals with a load testing of web applications. The text is introduced with a definition of the load testing, reasons for its execution and a description of its types. Recommended procedures are provided for preparation, execution and evaluation of the testing. Several commercial and open-source load testing tools are described. Cloud testing -- the contemporary phenomenon -- is also included. The entire process of load testing depicted in this text is demonstrated on a selected application. A following chapter briefly deals with a profiling of web applications. It, again, covers its definition and its purpose, accompanied with a practical example. The aim of this thesis is to introduce the reader to the world of load testing, which is primarily accomplished by describing an example, which provides an in-depth explanation for every step necessary in order to perform the web application testing successfully.

Die vorliegende Arbeit verfolgte die Zielstellung der Substitution des etablierten Weißmetalls als Laufschicht von hydrodynamischen Mehrflächengleitlagern durch neuartige Kunststoffschichten. Dazu wurden vergleichende Bauteilversuche an Mehrflächengleitlagern mit verschiedenen Laufschichten und Bohrungsformen vorgenommen. Eine Zinnbasislegierung als Laufflächenbeschichtung diente dabei als Referenzwerkstoff. Zur Durchführung des Versuchsprogrammes kam ein vorhandener, messtechnisch neu konditionierter Turbinenlagerprüfstand zum Einsatz. Die Versuchsreihen haben durchweg positive Beurteilungen der Lagerkennwerte im untersuchten Betriebsbereich der neuen Lagervarianten ergeben. Die neuartigen Laufschichtvarianten erfüllten die hohen tribologischen und thermischen Anforderungen. Einzelne Abweichungen der ermittelten Kennwerte wurden zahlenmäßig dokumentiert und können mit bereits verfügbaren physikalischen Modellen beschrieben werden. Die Ergebnisse erwiesen sich als unabhängig von der Lagerbauform aber abhängig von der gewählten Schichtvariante. Die Untersuchungen zum Betriebsverhalten unter hydrodynamischer Dauerbelastung sowie im Mischreibungsgebiet und im Notlaufbetrieb führten zu teilweise unterschiedlichen Ergebnissen. Im Mischreibungsgebiet wiesen die untersuchten Lager kaum Unterschiede im Betriebsverhalten auf. Im Dauerversuch zeigten die Lager mit Weißmetall, Gleitlack und Keramikschicht hervorragende Eigenschaften. Die Variante Klüberplast besaß eine ungenügende Bindefestigkeit und führte zu plastischen Verformungen der Schicht infolge der hydrodynamischen Drücke. Im Notlaufbetrieb übertrafen die untersuchten Kunststoffvarianten die Standzeiten des Referenzwerkstoffs Weißmetall. / The aim of this study was to identify and test an alternative liner material instead of common liner materials such as white alloy for multi-lobe radial bearings. For this purpose comparative tests with different radial bearings were carried out. The white alloy material was taken as a reference. In preparation for these test series, the measurement system of the turbine bearing test rig was upgraded. Experiments showed beneficial performances of the bearings with a plastic liner by evaluating the static and dynamic properties of different bearing geometries and liner thicknesses under a wide range of operating conditions. The new bearings fulfilled the high tribological and thermal requirements. Observed deviations of the determined parameters were documented in number and can be described with available physical models. The results were independent of the bearing type and depending on the selected liner material variant. The studies on operating performance in continuous operation in the mixed friction area and in dry running operation led to partially different results. The mixed friction tests showed little difference in the examined stock performance. The bearings with white alloy, ceramic layer and bonded coating showed excellent fatigue properties of long-term experiment. On Klüberplast insufficient bonding strength and plastic deformation of the layer due to the hydrodynamic pressure was found. In the dry running operation the investigated polymers exceeded the lifetime of the referencematerial white alloy.