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- Fachbereich 4 (115) (entfernen)
In recent years, traceability has been more and more universally accepted as being a key factor for the success of software development projects. However, the multitude of different, not well-integrated taxonomies, approaches and technologies impedes the application of traceability techniques in practice. This paper presents a comprehensive view on traceability, pertaining to the whole software development process. Based on graph technology, it derives a seamless approach which combines all activities related to traceability information, namely definition, recording, identification, maintenance, retrieval, and utilization in one single conceptual framework. The presented approach is validated in the context of the ReDSeeDS-project aiming at requirements-based software reuse.
In dieser Arbeit wird ein skelettbasiertes Matching-Verfahren für 2D-Objekte vorgestellt. Zunächst werden aktuelle Ansätze zum Matchen von Objekten vorgestellt, anschließend werden die Grundlagen von skelettbasiertem Matching erklärt. Ein skelettbasiertes Verfahren wurde im Rahmen dieser Arbeit gemäß dem vorliegenden Original-Paper neu implementiert. Diese Implementierung wird anhand einer Ähnlichkeitssuche in drei Bild-Datenbanken evaluiert. Stärken und Schwächen des Verfahrens werden herausgearbeitet. Des weiteren wird der vorgestellte Algorithmus auf Erweiterungen untersucht, die das Matchen von 3D-Objekten ermöglichen sollen. Im speziellen wird das Verfahren auf medizinische Daten angewendet: CT-Aufnahmen der abdominalen Aorta eines Patienten vor und nach einer Operation werden miteinander verglichen. Problemfälle und Erweiterungsansätze für das Matchen von 3D-Objekten im Allgemeinen und von Blutgefäßen im Speziellen werden vorgestellt.
Querying for meta knowledge
(2008)
The Semantic Web is based on accessing and reusing RDF data from many different sources, which one may assign different levels of authority and credibility. Existing Semantic Web query languages, like SPARQL, have targeted the retrieval, combination and reuse of facts, but have so far ignored all aspects of meta knowledge, such as origins, authorship, recency or certainty of data, to name but a few. In this paper, we present an original, generic, formalized and implemented approach for managing many dimensions of meta knowledge, like source, authorship, certainty and others. The approach re-uses existing RDF modeling possibilities in order to represent meta knowledge. Then, it extends SPARQL query processing in such a way that given a SPARQL query for data, one may request meta knowledge without modifying the query proper. Thus, our approach achieves highly flexible and automatically coordinated querying for data and meta knowledge, while completely separating the two areas of concern.
Prozedurale Synthese, das Erzeugen von Computerspielinhalten durch die Verwendung von pseudo-zufälligen Algorithmen, ist ein Themenbereich mit wachsendem Interesse in wirtschaftlichen und akademischen Kreisen, verdankt sowohl durch ihre Eignung zur Senkung von Entwicklungszeit und -kosten als auch durch die Möglichkeit, prozedurale Synthese zur Erzeugung von interessanten und einmaligen Spielwelten einzusetzen. Obwohl viele aktuelle Computerspiele prozedural generierte Inhalte verwenden, gebrauchen nur wenige diese Methoden zur Erzeugung realistischer Weltraum-Spielumgebungen, und die Umsetzbarkeit der Anwendung prozeduraler Synthese zur Entwicklung eines solchen Spiels wurde untersucht. Aktuelle Modelle aus der Forschung wurden verwendet, um eine in Echtzeit laufende astronomische Simulation in Python zu entwickeln, welche Stern- und Planetenobjekte in einer fiktiven Galaxie prozedural erzeugt, die als Spielwelt eines einfachen 2DWeltraumspiels dient, in welchem der Spieler nach intelligentem Leben suchen muss.
In dieser Arbeit werden vier der derzeit verfügbaren webbasierten Visualisierungstools evaluiert (FlexViz, Jambalaya applet, Experimental jOWL TouchGraph, Plone ontology).
Im Rahmen dieser Arbeit werden weiterhin folgende Fragen erforscht: 1. Welche Anforderungen an die Visualisierung von Ontologien können definiert werden? 2. Wie kann eine Bewertung und Analyse durchgeführt werden? 3. Wie kann eine ausgewählte Methode getestet werden? Basierend auf den Ergebnissen dieser Fragestellungen stellte sich die Visualisierungsmethode FlexViz im gegebenen Szenario als beste heraus. FlexViz wurde eingesetzt, indem es in das Content Management System Plone integriert wurde. Es wurde mit VCD Ontologien getestet und schließlich aus der Sicht verschiedener Interessengruppen analysiert. Es zeigte sich, dass FlexViz ein gutes Tool zum Visualisieren, Verstehen und Analysieren von bereits entwickelten Ontologien ist, da die Benutzeroberfläche benutzerfreundlich und interaktiv ist. Jedoch zeigt FlexViz deutliche Schwächen bzgl. dem Bearbeiten, Erweitern und Entwickeln von Ontologien.
In Silico simulation of biological systems is an important sub area of computational biology (system biology), and becomes more and more an inherent part for research. Therefore, different kinds of software tools are required. At present, a multitude of tools for several areas exists, but the problem is that most of the tools are essentially application specific and cannot be combined. For instance, a software tool for the simulation of biochemical processes is not able to interact with tools for the morphology simulation and vice versa. In order to obtain realistic results with computer-aided simulations it is important to regard the biological system in its entirety. The objective is to develop a software framework, which provides an interface structure to combine existing simulation tools, and to offer an interaction between all affiliated systems. Consequently, it is possible to re-use existing models and simulation programs. Additionally, dependencies between those can be defined. The system is designed to interoperate as an extendable architecture for various tools. The thesis shows the usability and applicability of the software and discusses potential improvements.
Particle Swarm Optimization ist ein Optimierungsverfahren, das auf der Simulation von Schwärmen basiert.
In dieser Arbeit wird ein modifizierter Algorithmus, der durch Khan et al. 2010 eingeführt wurde, zur Schätzung der lokalen Kamerapose in 6DOF verwendet. Die Poseschätzung basiert auf kontinuierlichen Farb-und Tiefendaten, die durch einen RGB-D Sensor zur Verfügung gestellt werden. Daten werden von unterschiedlichen Posen aufgenommen und als gemeinsames Model registriert. Die Genauigkeit und Berechnungsdauer der Implementierung wird mit aktuellen Algorithmen verglichen und in unterschiedlichen Konfigurationen evaluiert.
From September 4 to 11, 1992, a fiirst meeting between Ukrainian and German scientists interested in mathematical and computer modeling of social processes was held at Vorzel' near Kiev. The meeting had been planned for nearly three years by Igor V. Chernenko and Mikhail V. Kuz'min, then members of the research group on mathematical modeling in sociology at the Institute of Sociology of the Academy of Science of the Ukrainian Republic, and had to be postponed twice due to the political development in the former Soviet Union, but thanks to the organizers' perseverance (and in spite of a strike of the airport personell at Kiev Borispol Airport on the eve of the conference) the conference could at last be realized.rnThe main purpose of the conference was to discuss a synergetic interpretation of large-scale destructive social processes as catastrophic phenomena in self-organized systems.
This paper originates from the FP6 project "Emergence in the Loop (EMIL)" which explores the emergence of norms in artificial societies. Part of work package 3 of this project is a simulator that allows for simulation experiments in different scenarios, one of which is collaborative writing. The agents in this still prototypical implementation are able to perform certain actions, such as writing short texts, submitting them to a central collection of texts (the "encyclopaedia") or adding their texts to texts formerly prepared by other agents. At the same time they are able to comment upon others' texts, for instance checking for correct spelling, for double entries in the encyclopaedia or for plagiarisms. Findings of this kind lead to reproaching the original authors of blamable texts. Under certain conditions blamable activities are no longer performed after some time.
The natural and the artificial environment of mankind is of enormous complexity, and our means of understanding this complex environment are restricted unless we make use of simplified (but not oversimplified) dynamical models with the help of which we can explicate and communicate what we have understood in order to discuss among ourselves how to re-shape reality according to what our simulation models make us believe to be possible. Being both a science and an art, modelling and simulation isrnstill one of the core tools of extended thought experiments, and its use is still spreading into new application areas, particularly as the increasing availability of massive computational resources allows for simulating more and more complex target systems.
In the early summer of 2012, the 26th European Conference on Modelling andrnSimulation (ECMS) once again brings together the best experts and scientists in the field to present their ideas and research, and to discuss new challenges and directions for the field.
The 2012 edition of ECMS includes three new tracks, namely Simulation-BasedrnBusiness Research, Policy Modelling and Social Dynamics and Collective Behaviour, and extended the classical Finance and Economics track with Social Science. It attracted more than 110 papers, 125 participants from 21 countries and backgrounds ranging from electrical engineering to sociology.
This book was inspired by the event, and it was prepared to compile the most recent concepts, advances, challenges and ideas associated with modelling and computer simulation. It contains all papers carefully selected from the large number of submissions by the programme committee for presentation during the conference and is organised according to the still growing number tracks which shaped the event. The book is complemented by two invited pieces from other experts that discussed an emerging approach to modelling and a specialised application. rnrnWe hope these proceedings will serve as a reference to researchers and practitioners in the ever growing field as well as an inspiration to newcomers to the area of modelling and computer simulation. The editors are honoured and proud to present you with this carefully compiled selection of topics and publications in the field.