In this paper we present a concept for automated testing of object-oriented applications and a tool called SeDiTeC that implements these concepts for Java applications. SeDiTeC uses UML sequence diagrams, that are complemented by test case data sets consisting of parameters and return values for the method calls, as test specification and therefore can easily be integrated into the development process as soon as the design phase starts. SeDiTeC supports specification of several test case data sets for each sequence diagram as well as to combine several sequence diagrams to so-called combined sequence diagrams thus reducing the number of diagrams needed. For classes and their methods whose behavior is specified in sequence diagrams and the corresponding test case data sets SeDiTeC can automatically generate test stubs thus enabling testing right from the beginning of the implementation phase. Validation is not restricted to comparing the test case data sets with the observed data, but can also include validation of pre-and postconditions.
A critical issue with oxidation protected carbon/carbon composites used for spacecraft thermal protection is the formation of coating pinholes. In laboratory experiments, artificial pinholes were drilled through SiC-coatings on a carbon/carbon material and the material was oxidized at 600,
Research Summary Refractory metals ResearchHow would you… …describe the overall signifi cance of this paper?This paper describes the processing and properties at elevated temperatures for tungsten-rhenium and tungsten-rhenium with hafnium carbide. Tungsten-25% rhenium has an elastic modulas of greater than 400 GPA and an ultimate tensile strength exceeding 280 MPa at 1,921ºC. A novel material with hightemperature strength is described.…describe this work to a materials science and engineering professional with no experience in your technical specialty?High-temperature refractory metals for high-temperature applications are described in this paper.
…describe this work to a layperson?This material is a structural component at 2,000ºC.
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