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Technischer Report
On Globally Deterministic CD-Systems of Stateless R-Automata with Window Size One
(2011-03-30)
It is known that cooperating distributed systems (CD-systems) of stateless deterministic restarting automata with window size 1 accept a class of semi-linear languages that properly includes all rational trace languages. Although the component automata of such a CD-system are all deterministic, in general the CD-system itself is not, as in each of its computations, the initial component and the successor components are still chosen nondeterministically. Here we study CD-systems of stateless deterministic restarting ...
Technischer Report
On CD-systems of stateless deterministic R-automata with window size one
(2010-04-27)
We study cooperating distributed systems (CD-systems) of restarting automata that are very restricted: they are deterministic, they cannot rewrite, but only delete symbols, they restart immediately after performing a delete operation, they are stateless, and they have a read/write window of size 1 only, that is, these are stateless deterministic R(1)-automata. We study the expressive power of these systems by relating the class of languages that they accept by mode =1 computations to other well-studied language ...
Technischer Report
CD-Systems of Stateless Deterministic R(1)-Automata Governed by an External Pushdown Store
(2011-01-06)
We study cooperating distributed systems (CD-systems) of stateless deterministic restarting automata with window size 1 that are governed by an external pushdown store. In this way we obtain an automata-theoretical characterization for the class of context-free trace languages.
Technischer Report
Fujaba Days 2011
(2012-05-30)
Fujaba is an Open Source UML CASE tool project started at the software engineering group of Paderborn University in 1997. In 2002 Fujaba has been redesigned and became the Fujaba Tool Suite with a plug-in architecture allowing developers to add functionality easily while retaining full control over their contributions. Multiple Application Domains Fujaba followed the model-driven development philosophy right from its beginning in 1997. At the early days, Fujaba had a special focus on code generation from UML diagrams ...
Technischer Report
LWA 2010
(2011-01-12)
Dissertation
Supporting Researchers: Analyzing the Scholarly Publication Life Cycle and Social Bookmarking Systems
(2017-04-19)
Researchers must face the exponential growth of the body of available scholarly literature, which makes it ever harder to keep track with one’s own community, especially for newcomers. In this thesis, we explore different means of supporting researchers with that task. For this purpose, we follow two approaches: We provide analyses of research communities and of researchers’ interactions through data that can be obtained from the phases in the life cycle of scholarly publications (creation, dissemination, usage, and ...
Dissertation
Verknüpfung von Domänenwissen für ein Ontologie-basiertes IT-Management
(2018-05-14)
Mit der steigenden Komplexität von IT-Systemen wird auch die Verwaltung dieser Systeme komplexer. Den Fragestellungen, die sich durch diese Komplexität auf der Seite des Betriebs und der Überwachung von IT-Systemen stellen, wird durch integriertes und automatisiertes IT-Management begegnet, indem auch implizite Zusammenhänge zwischen Aspekten aus unterschiedlichen Sichten auf die Systeme berücksichtigt werden, sowie die weitgehende Eliminierung des manuellen Anteils bei Überwachung und Pflege der Systeme angestrebt ...
Dissertation
Abbildung von XML-Dokumenten auf SQL:2003-konforme Datentypen
(2012-08-10)
Die Auszeichnungssprache XML dient zur Annotation von Dokumenten und hat sich als Standard-Datenaustauschformat durchgesetzt. Dabei entsteht der Bedarf, XML-Dokumente nicht nur als reine Textdateien zu speichern und zu transferieren, sondern sie auch persistent in besser strukturierter Form abzulegen. Dies kann unter anderem in speziellen XML- oder relationalen Datenbanken geschehen. Relationale Datenbanken setzen dazu bisher auf zwei grundsätzlich verschiedene Verfahren: Die XML-Dokumente werden entweder unverändert ...
Dissertation
Context as a Service
(2013-03-22)
In the vision of Mark Weiser on ubiquitous computing, computers are disappearing from the focus of the users and are seamlessly interacting with other computers and users in order to provide information and services. This shift of computers away from direct computer interaction requires another way of applications to interact without bothering the user. Context is the information which can be used to characterize the situation of persons, locations, or other objects relevant for the applications.
Context-aware ...
Dissertation
Information Exchange and Fusion in Dynamic and Heterogeneous Distributed Environments
(2010-12-10)
Context awareness, dynamic reconfiguration at runtime and heterogeneity are key characteristics of future distributed systems, particularly in ubiquitous and mobile computing scenarios. The main contributions of this dissertation are theoretical as well as architectural concepts facilitating information exchange and fusion in heterogeneous and dynamic distributed environments. Our main focus is on bridging the heterogeneity issues and, at the same time, considering uncertain, imprecise and unreliable sensor information ...