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Die vorliegende Arbeit stellt eine Methode für die korpusbasierte Analyse der Verwendung von Softwarebibliotheken in Java-Programmen vor. Die meisten größeren Softwareprojekte verwenden Softwarebibliotheken, die als Schnittstelle für den Programmierer sogenannte APIs (application programming interfaces) bereitstellen. Um den Umstieg von einer solchen API auf eine andere zu unterstützen, strebt man Werkzeuge zur automatisierten API-Migration an. Zur Entwicklung solcher Werkzeuge fehlen allerdings noch Basisdaten. Statistiken und Beobachtungen zur Verwendung von APIs in der Praxis wurden bisher nur mit sehr kleinen Korpora von Projekten und APIs durchgeführt. Wir stellen in dieser Arbeit daher eine Analysemethode vor, die für Messungen an großen Korpora geeignet ist. Hierzu erzeugen wir zunächst einen Korpus von auf SourceForge gehosteten Open-Source-Projekten sowie einen Korpus von Softwarebibliotheken. In der Folge werden alle Projekte des Korpus compiliert, wobei ein Compiler-Plugin für den javac detaillierte Informationen über jede einzelne Methode liefert, die der Compiler erstellt. Diese Informationen werden in einer Datenbank gespeichert und analysiert.
Die Beschreibung des Verhaltens eines Multi-Agenten-Systems (MAS) ist eine fordernde Aufgabe, besonders dann, wenn es in sicherheitskritischen Umgebungen eingesetzt werden soll. Denn in solchen Umgebungen muss die Beschreibung besonders sorgfältig ausgeführt werden um Seiteneffekte zu vermeiden, die ungewünschte oder sogar zerstörerische Folgen haben könnten. Deshalb sind formale Methoden nützlich, die auf mathematischen Modellen des zu entwerfenden Systems basieren. Sie erlauben es nicht nur das System formal auf verschiedenen Abstraktionsebenen zu spezifizieren, sondern auch seine Konsistenz noch vor der Implementierung zu verifizieren. Das Ziel der formalen Spezifikation ist eine präzise und eindeutige Beschreibung des Verhaltens des Multi-Agenten-Systems, während die Verifikation darauf abzielt, geforderte Eigenschaften dieses Systems zu beweisen. Üblicherweise wird das Verhalten eines Agenten als diskrete Änderung seines Zustands im Bezug auf externe oder interne Aktionen aufgefasst. Jedes mal, wenn eine Aktion auftritt, ändert sich der Zustand des Agenten. Deshalb sind Zustandsübergangsdiagramme bzw. endliche Automaten ein naheliegender Ansatz das Verhalten zu modellieren. Ein weiterer Vorteil einer solchen Beschreibung ist, dass sie sich für das sogenannte Model Checking eignet. Dabei handelt es sich um eine automatische Analysetechnik, die bestimmt, ob das Modell des Systems spezifizierten Eigenschaften genügt. Allerdings muss in realistischen, physikalischen Umgebungen neben dem diskreten auch das kontinuierliche Verhalten des Multi-Agenten-Systems betrachtet werden. Dabei könnte es sich beispielsweise um die Schussbewegung eines Fußballspieler-Agenten, den Prozess des Löschens durch einen Feuerwehr-Agenten oder jedes andere Verhalten handeln, das auf zeitlichen physikalischen Gesetzen basiert. Die üblichen Zustandsübergangsdiagramme sind nicht ausreichend, um diese beiden Verhaltensarten zu kombinieren. Hybride Automaten stellen jedoch eine elegante Lösung dar. Im Wesentlichen erweitern sie die üblichen Zustandsübergangsdiagramme durch Methoden, die sich mit kontinuierlichen Aktionen befassen. Die Zustandsübergänge modellieren weiterhin die diskreten Verhaltenswechsel, während Differentialgleichungen verwendet werden um das kontinuierliche Verhalten zu beschreiben. Besonders geeignet erscheinen Hybride Automaten, weil ihre formale Semantik die Verifikation durch Model Checking erlaubt. Deshalb ist das Hauptziel dieser Arbeit, Hybride Automaten für die Modellierung und die Verifikation des Verhaltens von Multi-Agenten-Systemen einzusetzen. Jedoch bringt ihr Einsatz mehrere Probleme mit sich, die betrachtet werden sollten. Zu diesen Problemfeldern zählen Komplexität, Modularität und die Aussagestärke der Modelle. Diese Arbeit befasst sich mit diesen Problemen und liefert mögliche Lösungen.
Texture-based text detection in digital images using wavelet features and support vector machines
(2010)
In dieser Bachelorarbeit wird ein neues texturbasiertes Verfahren zur Detektion von Texten in digitalen Bildern vorgestellt. Das Verfahren kann im wesentlichen in zwei Hauptaufgaben unterteilt werden, in Detektion von Textblöcken und Detektion von einzelnen Wörtern, wobei die einzelnen Wörter aus den detektierten Textblöcken extrahiert werden. Im Groben agiert das entwickelte Verfahren mit mehreren Support Vector Machines, die mit Hilfe von waveletbasierten Merkmalen mögliche Textregionen eines Bildes zu wirklichen Textregionen klassiffzieren. Die möglichen Textregionen werden dabei durch unterschiedlich ausgerichtete Kantenprojektionen bestimmt. Das Resultat des Verfahrens sind X/Y Koordinaten, Breite und Höhe von rechteckigen Regionen eines Bildes, die einzelne Wörter enthalten. Dieses Wissen kann weiterverarbeitet werden, beispielsweise durch eine Texterkennungssoftware, um an die wichtigen und sehr nützlichen Textinformationrneines Bildes zu gelangen.
Investigating the environmental fate of iodinated X-ray contrast media in the urban water cycle
(2010)
Iodinated X-ray contrast media (ICM) are a group of emerging contaminants which have been detected at elevated concentrations in the aquatic environment. These compounds are excreted unmetabolized into hospital wastewater, and eventually treated at wastewater treatment plants (WWTPs). The removal of ICM in WWTPs has not been very effective and therefore the ICM enter the aquatic environment via WWTP effluent discharges. Research has investigated the removal of selected ICM via abiotic and biotic processes, however limited work has attempted to determine the fate of these compounds once released into the environment. This thesis investigates the biotransformation of four selected ICM (diatrizoate, iohexol, iomeprol, and iopamidol) in aerobic soil-water and sediment-water systems as well as in different environmental matrices. Iohexol, iomeprol and iopamidol were biotransformed to several TPs in the aerobic batch systems, while no biotransformation was observed for the ionic ICM, diatrizoate. In total 34 biotransformation products (TPs) of the three non-ionic ICM were identified. The combination of semi-preparative HPLC-UV, hybrid triple quadrupole-linear ion trap mass spectrometry (Qq-LIT-MS) was found to be an accurate approach for the structural elucidation of ICM TPs. The ICM TPs resulted in microbial transformation occurring at the side chains of the parent ICM, with the iodinated aromatic ring unmodified.
Ontologies play an important role in knowledge representation for sharing information and collaboratively developing knowledge bases. They are changed, adapted and reused in different applications and domains resulting in multiple versions of an ontology. The comparison of different versions and the analysis of changes at a higher level of abstraction may be insightful to understand the changes that were applied to an ontology. While there is existing work on detecting (syntactical) differences and changes in ontologies, there is still a need in analyzing ontology changes at a higher level of abstraction like ontology evolution or refactoring pattern. In our approach we start from a classification of model refactoring patterns found in software engineering for identifying such refactoring patterns in OWL ontologies using DL reasoning to recognize these patterns.
Mobile payment has been a payment option in the market for a long time now and was predicted to become a widely used payment method. However, over the years, the market penetration rate of mPayments has been relatively low, despite it having all characteristics required of a convenient payment method. The primaryrnreason for this has been cited as a lack of customer acceptance mainly caused due to the lack of perceived security by the end-user. Although biometric authentication is not a new technology, it is experiencing a revival in the light of the present day terror threats and increased security requirements in various industries. The application of biometric authentication in mPayments is analysed here and a suitable biometric authentication method for use with mPayments is recommended. The issue of enrolment, human and technical factors to be considered are discussed and the STOF business model is applied to a BiMoP (biometric mPayment) application.
In recent years ontologies have become common on the WWW to provide high-level descriptions of specific domains. These descriptions could be effectively used to build applications with the ability to find implicit consequences of their represented knowledge. The W3C developed the Resource Description Framework RDF, a language to describe the semantics of the data on the web, and the Ontology Web Language OWL, a family of knowledge representation languages for authoring ontologies. In this thesis we propose an ontology API engineering framework that makes use of the state-of-the-art ontology modeling technologies as well as of software engineering technologies. This system simplifies the design and implementation process of developing dedicated APIs for ontologies. Developers of semantic web applications usually face the problem of mapping entities or complex relations described in the ontology to object-oriented representations. Mapping complex relationship structures that come with complex ontologies to a useful API requires more complicated API representations than does the mere mapping of concepts to classes. The implementation of correct object persistence functions in such class representations also becomes quite complex.
With the Multimedia Metadata Ontology (M3O), we have developed a sophisticated model for representing among others the annotation, decomposition, and provenance of multimedia metadata. The goal of the M3O is to integrate the existing metadata standards and metadata formats rather than replacing them. To this end, the M3O provides a scaffold needed to represent multimedia metadata. Being an abstract model for multimedia metadata, it is not straightforward how to use and specialize the M3O for concrete application requirements and existing metadata formats and metadata standards. In this paper, we present a step-by-step alignment method describing how to integrate and leverage existing multimedia metadata standards and metadata formats in the M3O in order to use them in a concrete application. We demonstrate our approach by integrating three existing metadata models: the Core Ontology on Multimedia (COMM), which is a formalization of the multimedia metadata standard MPEG-7, the Ontology for Media Resource of the W3C, and the widely known industry standard EXIF for image metadata
Existing tools for generating application programming interfaces (APIs) for ontologies lack sophisticated support for mapping the logics-based concepts of the ontology to an appropriate object-oriented implementation of the API. Such a mapping has to overcome the fundamental differences between the semantics described in the ontology and the pragmatics, i.e., structure, functionalities, and behavior implemented in the API. Typically, concepts from the ontology are mapped one-to-one to classes in the targeted programming language. Such a mapping only produces concept representations but not an API at the desired level of granularity expected by an application developer. We present a Model-Driven Engineering (MDE) process to generate customized APIs for ontologies. This API generation is based on the semantics defined in the ontology but also leverages additional information the ontology provides. This can be the inheritance structure of the ontology concepts, the scope of relevance of an ontology concept, or design patterns defined in the ontology.
This dissertation provides an interdisciplinary contribution to the project ReGLaN-Health & Logistics. ReGLaN-Health & Logistics, is an international cooperation deriving benefits from the capabilities of scientists working on different fields. The aim of the project is the development of a socalled SDSS that supports decision makers working within health systems with a special focus on rural areas. In this dissertation, one important component for the development of the DSS named EWARS is proposed and described in detail. This component called SPATTB is developed with the intention of dealing with spatial data, i.e. data with additional geocoded information with regard to the special requirements of the EWARS.rnrnAn important component in the process of developing the EWARS is the concept of GIS. Classically, geocoded information with a vectorial character numerically describing spatial phenomena is managed and processed in a GIS. For the development of the EWARS, the manageability of the type of data exemplarily given by (x,y,o) with coordinates x,y ) and Ozon-concentration o is not sufficient. It is described, that the manageable data has to be extended to data of type (x,y,f ), where (x,y) are the geocoded information, but where f is not only a numerical value but a functional description of a certain phenomenom. An example for the existence and appearance of that type of data is the geocoded information about the variation of the Ozon-concentration in time or depending on temperature. A knowledge-base as important subsystem of DSS containing expert knowledge is mentioned. This expert-knowledge can be made manageable when using methods from the field of fuzzy logic. Thereby mappings, socalled fuzzy-sets, are generated. Within the EWARS, these mappings will be used with respect to additional geocoded data. The knowledge about the geocoded mapping information only at a finite set of locations (x,y) associated with mapping information f is not sufficient in applications that need continuous statements in a certain geographical area. To provide a contribution towards solving this problem, methods from the field of computer geometry and CAD, so-called Bezier-methods, are used for interpolating this geocoded mapping information. Classically, these methods operates on vectors a the multidimensional vector-space whose elements contain real-valued components but in terms of dealing with mapping information, there has to be an extension on topological vector spaces since mapping spaces can be defined as such spaces. This builds a new perspective and possibility in the application of these methods. Therefore, the according algorithms have to be extended; this work is presented. The field of Artificial Neural Networks plays an important role for the processing and management of the data within the EWARS, where features of biological processes and structures are modeled and implemented as algorithms. Generally, the developed methods can be divided as usable in terms of interpolation or approximation functional coherences and in such being applicable to classification problems. In this dissertation one method from each type is regarded in more detailed. Thereby, the classical algorithms of the so-called Backpropagation-Networks for approximation and the Kohonen-Networks for classification are described. Within the thesis, an extension of these algorithms is then proposed using coherences from mathematical measure-theory and approximation theory. The mentioned extension of these algorithms is based on a preprocessing of the mapping data using integration methods from measure theory.