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Die Entwicklung eines IT-gestützten europäischen Systems zur öffentlichen Auftragsvergabe ist ein wichtiges Ziel der EU um die Effizienz, Transparenz und Wettbewerbsfähigkeit im öffentlichen Beschaffungswesen des europäischen Binnenmarktes zu verbessern. Ein großes Hindernis für die grenzüberschreitende elektronische Abwicklung der Beschaffungsprozesse ist die Heterogenität der nationalen Beschaffungssysteme in Bezug auf technische, organisatorische und rechtliche Unterschiede. Zur Überwindung dieses Hindernisses finanziert die Europäische Kommission einige Initiativen, um grenzüberschreitend Interoperabilität der öffentlichen Beschaffungssysteme zu erreichen. Pan European Public Procurement OnLine (PEPPOL) ist ein solches Projekt, das die Pilotierung eines interoperablen pan-europäischen Systems zur elektronischen Unterstützung der öffentlichen Beschaffungsprozesse als Ziel hat. rnrnService-orientierte Architekturen(SOA) scheinen einen vielversprechenden Ansatz für die Realisierung solch verteilter Architekturen zu liefern, da sie die lose Kopplung und Interoperabilität zwischen Systemkomponenten fördert. Diese Masterarbeit diskutiert daher das SOA(Service-orientierte Architektur)-Konzept und die Fragestellung, wie seine Konzepte, Methoden und Technologien für die Entwicklung von interoperablen IT-Systemen für die elektronische Vergabe öffentlicher Aufträge verwendet werden können. Diese Diskussion wird durch eine praktische Anwendung des diskutierten service-orientierten Ansatzes erweitert, in dem die Konzeption und prototypische Implementierung eines Teilsystems der VCD Domäne durchgeführt wird. Zu diesem Zweck werden wichtige Aspekte bezüglich Interoperabilität und damit verbundener Standards und Technologien untersucht und im Kontext der öffentlichen Auftragsvergabe betrachtet.
Conventional security infrastructures in the Internet cannot be directly adopted to ambient systems, especially if based on short-range communication channels: Personal, mobile devices are used and the participants are present during communication, so privacy protection is a crucial issue. As ambient systems cannot rely on an uninterrupted connection to a Trust Center, certiffed data has to be veriffed locally. Security techniques have to be adjusted to the special environment. This paper introduces a public key infrastructure (PKI) to provide secure communication channels with respect to privacy, confidentiality, data integrity, non-repudiability, and user or device authentication. It supports three certiffcate levels with a different balance between authenticity and anonymity. This PKI is currently under implementation as part of the iCity project.
The lack of a formal event model hinders interoperability in distributed event-based systems. Consequently, we present in this paper a formal model of events, called F. The model bases on an upper-level ontology and pro-vides comprehensive support for all aspects of events such as time and space, objects and persons involved, as well as the structural aspects, namely mereological, causal, and correlational relationships. The event model provides a flexible means for event composition, modeling of event causality and correlation, and allows for representing different interpretations of the same event. The foundational event model F is developed in a pattern-oriented approach, modularized in different ontologies, and can be easily extended by domain specifific ontologies.
In dieser Dissertation wird eine Verfahrensweise für die formale Spezifikation und Verifikation von Benutzerschnittstellen unter Sicherheitsaspekten vorgestellt. Mit dieser Verfahrensweise können beweisbar sichere Benutzerschnittstellen realisiert werden. Die Arbeit besteht aus drei Teilen. Im ersten Teil wird eine Methodologie für die formale Beschreibung von Mensch-Maschine-Interaktion entwickelt. Im zweiten Teil werden gängige Computersicherheitskonzepte für die Mensch-Maschine-Interaktion angepasst und mit den im ersten Teil entwickelten Methoden formalisiert. Dabei wird ein generisches formales Modell von Mensch-Maschine-Interaktion erstellt. Im dritten Teil wird die Methodologie, die in den ersten beiden Teilen entwickelt wurde, an einem sicheren Email-Client als exemplarischen Anwendungsprogramm demonstriert.
Global crop production increased substantially in recent decades due to agricultural intensification and expansion and today agricultural areas occupy about 38% of Earth’s terrestrial surface - the largest use of land on the planet. However, current high-intensity agricultural practices fostered in the context of the Green Revolution led to serious consequences for the global environment. Pesticides, in particular, are highly biologically active substances that can threaten the ecological integrity of aquatic and terrestrial ecosystems. Although the global pesticide use increases steadily, our field-data based knowledge regarding exposure of non-target ecosystems such as surface waters is very restricted. Available studies have by now been limited to spatially restricted geographical areas or had rather specific objectives rendering the extrapolation to larger spatial scales questionable.
Consequently, this thesis evaluated based on four scientific publications the exposure, effects, and regulatory implications of particularly toxic insecticides` concentrations detected in global agricultural surface waters. FOCUS exposure modelling was used to characterise the highly specific insecticide exposure patterns and to analyse the resulting implications for both monitoring and risk assessment (publication I). Based on more than 200,000 scientific database entries, 838 peer-reviewed studies finally included, and more than 2,500 sites in 73 countries, the risks of agricultural insecticides to global surface waters were analysed by means of a comprehensive meta-analysis (publication II). This meta-analysis evaluated whether insecticide field concentrations exceed legally accepted regulatory threshold levels (RTLs) derived from official EU and US pesticide registration documents and, amongst others, how risks depend on insecticide development over time and stringency of environmental regulation. In addition, an in-depth analysis of the current EU pesticide regulations provided insights into the level of protection and field relevance of highly elaborated environmental regulatory risk assessment schemes (publications III and IV).
The results of this thesis show that insecticide surface water exposure is characterized by infrequent and highly transient concentration peaks of high ecotoxicological relevance. We thus argue in publication I that sampling based on regular intervals is inadequate for the detection of insecticide surface water concentrations and that traditional risk assessment concepts based on all insecticide concentrations including non-detects lead to severely biased results and critical underestimations of risks. Based on these considerations, publication II demonstrates that out of 11,300 measured insecticide concentrations (MICs; i.e., those actually detected and quantified), 52.4% (5,915 cases; 68.5%) exceeded the RTL for either water (RTLSW) or sediments. This indicates a substantial risk for the biological integrity of global water resources as additional analyses on pesticide effects in the field clearly evidence that the regional aquatic biodiversity is reduced by approximately 30% at pesticide concentrations equalling the RTLs. In addition, publication II shows that there is a complete lack of scientific monitoring data for ~90% of global cropland and that both the actual insecticide contamination of surface waters and the resulting ecological risks are most likely even greater due to, for example, inadequate sampling methods employed in the studies and the common occurrence of pesticide mixtures. A linear model analysis identified that RTLSW exceedances depend on the catchment size, sampling regime, sampling date, insecticide substance class, and stringency of countries` environmental regulations, as well as on the interactions of these factors. Importantly, the risks are significantly higher for newer-generation insecticides (i.e., pyrethroids) and are high even in countries with stringent environmental regulations. Regarding the latter, an analysis of the EU pesticide regulations revealed critical deficiencies and the lack of protectiveness and field-relevance for current presumed highly elaborated FOCUS exposure assessment (publication IV) and overall risk assessment schemes (publication III). Based on these findings, essential risk assessment amendments are proposed.
In essence, this thesis analyses the agriculture–environment linkages for pesticides at the global scale and it thereby contributes to a new research frontier in global ecotoxicology. The overall findings substantiate that agricultural insecticides are potential key drivers for the global freshwater biodiversity crisis and that the current regulatory risk assessment approaches for highly toxic anthropogenic chemicals fail to protect the global environment. This thesis provides an integrated view on the environmental side effects of global high-intensity agriculture and alerts that beside worldwide improvements to current pesticide regulations and agricultural pesticide application practices, the fundamental reformation of conventional agricultural systems is urgently needed to meet the twin challenges of providing sufficient food for a growing human population without destroying the ecological integrity of global ecosystems essential to human existence.
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.
In der heutigen Robotik-Forschung soll hauptsächlich die Interaktion von autonomen, mobilen Robotern mit vorher nicht bekannten Umgebungen ermöglicht werden. Eines der grundlegendsten Probleme, das in diesem Kontext gelöst werden muss, ist die Frage, wo der Roboter ist und wie seine Umgebung in unmittelbarer Nähe, aber auch an bereits besuchten Orten aussieht " das sogenannte SLAM Problem.
In dieser Arbeit wird ein GraphSLAM System vorgestellt, das einen graphbasierten Lösungsansatz für dieses Problem darstellt. Ein solches System besteht aus einem Frontend und einem Backend. Das Frontend hat die Aufgabe, aus den Sensordaten einen Graphen zu konstruieren, der die relative Lage der Messungen zueinander widerspiegelt. Da sich Messungen widersprechen können, ist ein solcher Graph im Allgemeinen inkonsistent. Das Backend hat nun die Aufgabe, diesen Graphen zu optimieren, d. h. eine Konfiguration der Knoten zu bestimmen, die sich nur minimal widerspricht. Knoten repräsentieren Roboterposen, die aufgrund der enthaltenen Rotationen sog. Mannigfaltigkeiten sind und keinen gewöhnlichen Vektorraum bilden. Dies wird in der Arbeit konsequent berücksichtigt, was zu einem sehr effizienten und eleganten Optimierungsverfahren führt.
The term "Augmented Reality (AR)" denotes the superposition of additional virtual objects and supplementary information over real images. The joint project Enhanced Reality (ER)1 aims at a generic AR-system. The ER-project is a cooperation of six different research groups of the Department of Computer Science at the University of Koblenz-Landau. According to Ronald Azuma an AR-system combines real and virtual environments, where the real and virtual objects are registered in 3-D, and it provides interactivity in real time [Azu97]. Enhanced Reality extends Augmented Reality by requiring the virtual objects to be seamlessly embedded into the real world as photo-realistic objects according to the exact lighting conditions. Furthermore, additional information supplying value-added services may be displayed and interaction of the user may even be immersive. The short-term goal of the ER-project is the exploration of ER-fundamentals using some specific research scenarios; the long-term goal is the development of a component-based ER-framework for the creation of ER-applications for arbitrary application areas. ER-applications are developed as single-user applications for users who are moving in a real environment and are wearing some kind of visual output device like see-through glasses and some mobile end device. By these devices the user is able to see reality as it is, but he can also see the virtual objects and the additional information about some value-added service. Furthermore he might have additional devices whereby he can interact with the available virtual objects. The development of a generic framework for ER-applications requires the definition of generic components which are customizable and composable to build concrete applications and it requires a homogeneous data model which supports all components equally well. The workgroup "Software Technology"2 is responsible for this subproject. This report gives some preliminary results concerning the derivation of a component-based view of ER. There are several augmented reality frameworks like ARVIKA, AMIRE, DWARF, MORGAN, Studierstube and others which offer some support for the development of AR-applications. All of them ease the use of existing subsystems like AR-Toolkit, OpenGL and others and leverage the generation process for realistic systems by making efficient use of those subsystems. Consequently, they highly rely on them.
In dieser Arbeit wurde erstmalig das Gebiet der funktionalen, system-level Web Testing Tools analysiert. Aus 194 Toolkandidaten wurden 23 Tools zur Analyse ausgewählt. Die entwickelte Methodik verwendet die Benutzerhandbücher der Tools, um ein Featuremodel zu erzeugen, dass die Features aller Tools abbildet. Insgesamt wurden 313 Features identifiziert, klassifiziert und beschrieben. Die Features wurden in 10 Kategorien unterteilt und werden mit 16 Featurediagrammen dargestellt.rnDie Ergebnisse können technologische Entscheidungsprozesse unterstützen, indem ein Überblick einerseits über die Tools auf dem Markt und andererseits über die neusten Entwicklungen im Bereich des funktionalen, system-level Web Testing bereitgestellt wird.