10 research outputs found
Space-Based Information Infrastructure Architecture for Broadband Services
This study addressed four tasks: (1) identify satellite-addressable information infrastructure markets; (2) perform network analysis for space-based information infrastructure; (3) develop conceptual architectures; and (4) economic assessment of architectures. The report concludes that satellites will have a major role in the national and global information infrastructure, requiring seamless integration between terrestrial and satellite networks. The proposed LEO, MEO, and GEO satellite systems have satellite characteristics that vary widely. They include delay, delay variations, poorer link quality and beam/satellite handover. The barriers against seamless interoperability between satellite and terrestrial networks are discussed. These barriers are the lack of compatible parameters, standards and protocols, which are presently being evaluated and reduced
The design and application of power line carrier communication and remote meter reading for use in integrated services and broadband - integrated services digital networks
SIGLEAvailable from British Library Document Supply Centre-DSC:DXN009939 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Forschungs- und Arbeitsgebiete des Instituts für Telematik
Dieser Interne Bericht gibt einen Ueberblick ueber aktuelle
Forschungsarbeiten des Instituts fuer Telematik der Universitaet
Karlsruhe in den Bereichen Hochleistungskommunikation, verteilte
Systeme, Cooperation&Management und Telekooperation. Er ist in
zwei Teile gegliedert. Der erste beschreibt die persoenlichen
Interessensgebiete der wissenschaftlichen Mitarbeiter. Danach folgt
eine Darstellung der Kooperationsprojekte des Instituts.
Im Anhang finden sich die referenzierten Literaturstellen sowie
aktuelle Eigenveroeffentlichungen der Mitarbeiter des Instituts.
Der Bericht entstand im Rahmen der Klausurtagung des Instituts
in Rothenburg ob der Tauber im Oktober 1996
Diagnosing interoperability problems and debugging models by enhancing constraint satisfaction with case -based reasoning
Modeling, Diagnosis, and Model Debugging are the three main areas presented in this dissertation to automate the process of Interoperability Testing of networking protocols. The dissertation proposes a framework that uses the Constraint Satisfaction Problem (CSP) paradigm to define a modeling language and problem solving mechanism for interoperability testing, and uses Case-Based Reasoning (CBR) for debugging interoperability test cases.
The dissertation makes three primary contributions: (1) Definition of a new modeling language using CSP and Object-Oriented Programming. This language is simple, declarative, and transparent. It provides a tool for testers to implement models of interoperability test cases. The dissertation introduces the notions of metavariables, metavalues and optional metavariables to improve the modeling language capabilities. It proposes modeling of test cases from test suite specifications that are usually used in interoperability testing performed manually by testers. Test suite specifications are written by organizations or individuals and break down the testing into modules of test cases that make diagnosis of problems more meaningful to testers. (2) Diagnosis of interoperability problems using search supplemented by consistency inference methods in a CSP context to support explanations of the problem solving behavior. These methods are adapted to the OO-based CSP context. Testers can then generate reports for individual test cases and for test groups from a test suite specification. (3) Detection and debugging of incompleteness and incorrectness in CSP models of interoperability test cases. This is done through the integration of two modes of reasoning, namely CBR and CSP. CBR manages cases that store information about updating models as well as cases that are related to interoperability problems where diagnosis fails to generate a useful explanation. For the latter cases, CBR recalls previous similar useful explanations