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Die weltweite Vernetzung von semantischen Information schreitet stetig voran und erfährt mit der Linked Data Initiative immer mehr Aufmerksamkeit. Bei Linked Data werden verschiedene Datensätze aus unterschiedlichen Domänen und von diversen Anbietern in einem einheitlichen Format (RDF) zur Verfügung gestellt und miteinander verknüpft. Strukturell ist das schnell wachsende Linked Data Netzwerk sehr ähnlich zum klassischen World Wide Web mit seinen verlinkten HTML Seiten. Bei Linked Data handelt es sich jedoch um URI-referenzierte Entitäten, deren Eigenschaften und Links durch RDF-Triple ausgedrückt werden. Neben dem Dereferenzieren von URIs besteht mit SPARQL auch die Möglichkeit, ähnlich wie bei Datenbanken, komplexe algebraische Anfragen zu formulieren und über sogenannte SPARQL Endpoints auf einer Datenquelle auswerten zu lassen. Eine SPARQL Anfrage über mehrere Linked Data Quellen ist jedoch kompliziert und bedarf einer föderierten Infrastruktur in der mehrere verteilte Datenquellen integriert werden, so dass es nach außen wie eine einzige große Datenquelle erscheint. Die Föderation von Linked Data hat viele Ähnlichkeiten mit verteilten und föderierten Datenbanken. Es gibt aber wichtige Unterschiede, die eine direkte Adpation von bestehenden Datenbanktechnologien schwierig machen. Dazu gehört unter anderem die große Anzahl heterogener Datenquellen in der Linked Data Cloud, Beschränkungen von SPARQL Endpoints, und die teils starke Korrelation in den RDF Daten. Daher befasst sich die vorliegende Arbeit primär mit der Optimierung von verteilten SPARQL Anfragen auf föderierten RDF Datenquellen. Die Grundlage dafür ist SPLENDID, ein effizientes Optimierungverfahren für die Ausführung von verteilten SPARQL Anfragen in einer skalierbaren und flexiblen Linked Data Föderationsinfrastruktur. Zwei Aspekte sind dabei besonders wichtig: die automatische Auswahl von passenden Datenquellen für beliebige SPARQL Anfragen und die Berechnung des optimalen Ausführungsplans (Join Reihenfolge) basierend auf einem Kostenmodell. Die dafür erforderlichen statistischen Information werden mit Hilfe von VOID-basierten Datenquellenbeschreibungen zur Verfügung gestellt. Darüberhinaus wird auch des Management verteilter statistischer Daten untersucht und eine Benchmark-Methodologie
This thesis was motivated by the need to advance the knowledge on the variability and dynamics of energy fluxes in lakes and reservoirs, as well as about the physical processes that regulate the fluxes at both the air and water side of the air-water interface.
In the first part, I re-examine how mechanical energy, resulting from its major source – the vertical wind energy flux - distributes into the various types of water motions, including turbulent flows and surface and internal waves. Although only a small fraction of the wind energy flux from the atmosphere is transferred to the water, it is crucial for physical, biogeochemical and ecological processes in lentic ecosystems. Based on extensive air- and water-side measurements collected at two small water bodies (< 10 km2), we estimated the energy fluxes and energy content in surface and in internal waves. Overall, the estimated energy fluxes and energy content agree well with results reported for larger water bodies, suggesting that the energetics driving the water motions in enclosed basins is similar, independently of the basin size. Our findings highlight the importance of the surface waves that receive the largest fraction of the wind energy flux, which strongly nonlinearly increases for wind speeds exceeding 3 m s-1. We found that the existing parameterization of the wave height as a function of wind speed and fetch length did not reproduce the measured wave amplitude in lakes. On average, the highest energy content was observed in basin-scale internal waves, together with high-frequency internal waves exhibiting seasonal variability and varies among the aquatic systems. During our analysis, we discovered the diurnal variability of the energy dissipation rates in the studied lake, suggesting biogenic turbulence generation, which appears to be a widespread phenomenon in lakes and reservoirs.
In the second part of the thesis, I addressed current knowledge gaps related to the bulk transfer coefficients (also known as the drag coefficient, the Stanton number and the Dalton number), which are of a particular importance for the bulk estimation of the surface turbulent fluxes of momentum, sensible and latent heat in the atmospheric boundary layer. Their inaccurate representation may lead to significant errors in flux estimates, affecting, for example, the weather and climate predictions or estimations of the near-surface current velocities in lake hydrodynamic models. Although the bulk transfer coefficients have been extensively studied over the past several decades (mainly in marine and large-lake environments), there has been no systematic analysis of measurements obtained at lakes of different size. A significant increase of the transfer coefficients at low wind speeds (< 3 m s-1) has been observed in several studies, but, to date, it has remained unexplained. We evaluated
the bulk transfer coefficients using flux measurements from 31 lakes and reservoirs. The estimates were generally within the range reported in previous studies for large lakes and oceans. All transfer coefficients increased substantially at low wind speeds, which was found to be associated with the presence of gusts and capillary waves (except the Dalton number). We found that the Stanton number is systematically higher than the Dalton number. This challenges the assumption made in the Bowen-ratio method, which is widely used for estimating evaporation rates from micrometeorological measurements. We found that the variability of the transfer coefficients among the lakes could be associated with lake surface area. In flux parameterizations at lake surfaces, it is recommended to consider variations in the drag coefficient and the Stanton number due to wind gustiness and capillary wave roughness while the Dalton number could be considered as constant at all wind speeds.
In the third part of the thesis, I address the key drivers of the near-surface turbulence that control the gas exchange in a large regulated river. As all inland waters, rivers are an important natural source of greenhouse gases. The effects of the widespread alteration and regulation of river flow for human demands on gas exchange is largely unknown. In particular, the near-surface turbulence in regulated rivers has been rarely measured and its drivers have not been identified. While in lakes and reservoirs, near-surface turbulence is mainly related to atmospheric forcing, in shallow rivers and streams it is generated by bottom friction of the gravity-forced flow. The studied large regulated river represents a transition between these two cases. Atmospheric forcing and gravity were the dominant drivers of the near-surface turbulence for a similar fraction of the measurement period. Based on validated scalings, we derived a simple model for estimating the relative contributions of wind and bottom friction to near-surface turbulence in lotic ecosystems with different flow depths. Large diel variability in the near-surface energy dissipation rates due to flow regulation leads to the same variability in gas exchange. This suggests that estimates of gas fluxes from rivers are biased by measurements performed predominantly during daytime.
In addition, the novelty in all the analyses described above is the use of the turbulent surface fluxes measured directly by the eddy-covariance technique – at the moment of writing, the most advanced method. Overall, this thesis is of a potential interest for a broad range of scientific disciplines, including limnology, micrometeorology and open channel hydraulics.
Dadurch, dass Silber-Nanopartikel (Ag NPs) vielfältig in Konsumartikeln eingesetzt werden, führt deren Auswaschung zu einer kontinuierlichen Freisetzung von Ag NPs in natürliche Gewässer. Dadurch werden bakterielle Biofilme, welche die vorherrschende Lebensform von Mikroorganismen in der aquatischen Umwelt darstellen, sehr wahrscheinlich mit diesen in Form eines Umweltschadstoffes onfrontiert. Ungeachtet der bedeutsamen ökologischen Relevanz von bakteriellen Biofilmen in aquatischen Systemen und obwohl erwartet wird, dass Ag NPs in diesen Biofilmen in der Umwelt akkumulieren, liegt der Wissensstand hinsichtlich der umweltbedingten und ökologischen Auswirkung von Ag NPs hinter dem industriellen Wachstum der Nanotechnologie zurück. Demzufolge ist das Ziel dieser Dissertation, die Wirkungsbeziehung der Ag NP-Exposition gegenüber bakteriellen Biofilmen mit Ag NP-Immissionskonzentrationen und unter umwelt-relevanten Bedingungen zu erbringen. Infolgedessen wurden eine umfassende Reihe an Methoden angewendet, um zu untersuchen ob und inwiefern Ag NPs in zwei verschiedenen Größen (30 und 70 nm) und in umweltrelevanten Konzentrationen (600 - 2400 µg l-1) bakterielle Biofilme, d.h. monospecies- und Süßwasser-Biofilme, beeinträchtigen. Innerhalb des ersten Teils dieser Arbeit wurde ein neu entwickelter Assay validiert, um die mechanische Stabilität von monospecies Biofilmen des Bakteriums Aquabacterium citratiphilum zu untersuchen. In der ersten Studie, welche den Einfluss von Ag NPs auf die mechanische Stabilität von bakteriellen Biofilmen untersucht hat, wurden subletale Auswirkungen auf die mechanische Stabilität dieser Biofilme mit negativen Implikationen für die Biostabilisation festgestellt. Weiterhin wurde eine Mesokosmus-Studie konzipiert und durchgeführt, innerhalb der die Auswirkungen von Ag NPs auf Süßwasser-Biofilme eingehend unter realistischen Umweltbedingungen untersucht werden konnte, da es derzeit technisch noch sehr anspruchsvoll ist, die Ökotoxizität von Ag NPs in der Umwelt von Binnengewässern zu untersuchen. Innerhalb dieser Studie wurden verschiedene Methoden zur Untersuchung der Biofilmeigenschaften eingesetzt und damit Erkenntnisse über die Resilienz von bakteriellen Süßwasser-Biofilmen gewonnen. Demgegenüber konnte mittels t-RFLP fingerprinting und phylogenetischen Untersuchungen basierend auf der Sequenzanalyse des 16S-rRNA-Gens nachgewiesen werden, dass die Exposition der Biofilme mit Ag NPs zu einer Verschiebung innerhalb der Zusammensetzung der bakteriellen Biofilmgemeinschaft führt, in der Ag NP-sensitive Arten von Ag NP-toleranten Arten, die besser an Ag NP Stress adaptiert sind, verdrängt wurden. Diese Verschiebung innerhalb der bakteriellen Biofilmgemeinschaft könnte die Biofilm-Leistungen beeinträchtigen, die intakte Biofilme auszeichnen, wie etwa den Abbau erhöhten Nährstoffeintrags, die Umwandlung und/oder den Abbau von Schadstoffen sowie Biostabilisation. Durch das Zusammenführen der wichtigsten Erkenntnisse dieser Dissertation konnten 4 generelle Wirkmechanismen durch die Ag NP-Behandlung identifiziert werden, die auf natürliche Süßwassersysteme übertragbar sein könnten: (i) Comamonadaceae wurden als Ag NP-tolerant identifiziert, (ii) Biofilme zeigen ein partiell resilientes Verhalten, (iii) die beiden eingesetzten verschiedenen Ag NP-Größen führten zu vergleichbaren Ergebnissen unabhängig von deren Größe oder Synthesemethode, (iv) Bakterielle Biofilme verfügen über eine hohe Aufnahmekapazität für Ag NPs, die auf eine kumulative Anreicherung hinweist.
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.
SOA-Security
(2007)
This paper is a part of the ASG project (Adaptive Services Grid) and addresses some IT security issues of service oriented architectures. It defines a service-oriented security concept, it explores the SOA security challenge, it describes the existing WS-Security standard, and it undertakes a first step into a survey on best practice examples. In particular, the ASG middleware platform technology (JBossWS) is analyzed with respect to its ability to handle security functions.
This paper describes the development of security requirements for non-political Internet voting. The practical background is our experience with the Internet voting within the Gesellschaft für Informatik (GI - Informatics Society) 2004 and 2005. The theoretical background is the international state-of-the-art of requirements about electronic voting, especially in the US and in Europe. A focus of this paper is on the user community driven standardization of security requirements by means of a Protection Profile of the international Common Criteria standard.
Virtual Goods + ODRL 2012
(2012)
This is the 10th international workshop for technical, economic, and legal aspects of business models for virtual goods incorporating the 8th ODRL community group meeting. This year we did not call for completed research results, but we invited PhD students to present and discuss their ongoing research work. In the traditional international group of virtual goods and ODRL researchers we discussed PhD research from Belgium, Brazil, and Germany. The topics focused on research questions about rights management in the Internet and e-business stimulation. In the center of rights management stands the conception of a formal policy expression that can be used for human readable policy transparency, as well as for machine readable support of policy conformant systems behavior up to automatic policy enforcement. ODRL has proven to be an ideal basis for policy expressions, not only for digital copy rights, but also for the more general "Policy Awareness in the World of Virtual Goods". In this sense, policies support the communication of virtual goods, and they are a virtualization of rules-governed behavior themselves.
Die voranschreitende Vernetzung von Fahrzeugen wird einen erheblichen Einfluss auf die Mobilitätslösungen von Morgen haben. Solche Systeme werden stark auf den zeitnahen Austausch von Informationen angewiesen sein, um die funktionale Zuverlässigkeit, Sicherheit von Fahrfunktionen und somit den Schutz von Insassen zu gewährleisten. Allerdings zeigt sich bei näherer Betrachtung der verwendeten Kommunikationsmodelle heutiger Netzwerke, wie beispielsweise dem Internet, dass diese Modelle einem host-zentrierten Prinzip folgen. Dieses Prinzip stellt das Management von Netzwerken mit einem hohen Grad an mobilen Teilnehmern vor große Herausforderungen hinsichtlich der effizienten Verteilung von Informationen. In den vergangen Jahren hat sich das Information-Centric Networking (ICN) Paradigma als vielversprechender Kandidat für zukünftige datenorientierte mobile Netzwerke empfohlen. Basierend auf einem lose gekoppelten Kommunikationsmodell unterstzützt ICN Funktionen wie das Speichern und Verarbeiten von Daten direkt auf der Netzwerkschicht. Insbesondere das aktive, gezielte Platzieren von Daten nahe der Benutzer stellt einen vielversprechenden Ansatz zur Erhöhung der Datenbereitstellung in mobilen Netzen dar. Die vorliegende Arbeit legt den Fokus auf die Erforschung von Strategien zum orchestrieren und aktiven Platzieren von Daten für Fahrzeuganwendungen im Netzwerk für mobile Teilnehmer. Im Rahmen einer Analyse unterschiedlicher Fahrzeugapplikationen und deren Anforderungen, werden neue Strategien für das aktive Platzieren vorgestellt. Unter Verwendung von Netzwerksimulationen werden diese Strategien umfangreich untersucht und in im Rahmen eines prototypischen Aufbaus unter realen Bedingungen ausgewertet. Die Ergebnisse zeigen Verbesserungen in der zeitnahen Zustellung von Inhalten (die Verfügbarkeit spezifischer Daten wurde im Vergleich zu existierenden Strategien um bis zu 35% erhöht), während die Auslieferungszeiten verkürzt wurden. Allerdings bedingt das aktive Platzieren und Speichern von Daten auch Risiken der Datensicherheit und Privatsphäre. Auf der Basis einer Sicherheitsanalyse stellt der zweite Teil der Arbeit ein Konzept zur Zugriffskontrolle von gespeicherten Daten in verteilten Fahrzeugnetzwerken vor. Abschließend werden offene Problemstellungen und Forschungsrichtungen im Kontext Sicherheit von verteilten Berechnungsarchitekturen für vernetze Fahrzeugnetzwerke diskutiert.
Streams are coupled with their riparian area. Emerging insects from streams can be an important prey in the riparian area. Such aquatic subsidies can cause predators to switch prey or increase predator abundances. This can impact the whole terrestrial food web. Stressors associated with agricultural land use can alter insect communities in water and on land, resulting in complex response patterns of terrestrial predators that rely on prey from both systems.
This thesis comprises studies on the impact of aquatic nsects on a terrestrial model ecosystem (Objective 1, hapter 2), the influence of agricultural land use on riparian spiders’ traits and community (Objective 2, Chapter 3), and on the impact of agricultural land use on the contribution of different prey to spider diet (Objective 3, Chapter 4).
In chapter 2, I present a study where we conducted a mesocosm experiment to examine the effects of aquatic subsidies on a simplified terrestrial food web consisting of two types of herbivores (leafhoppers and weevils), plants and predators (spiders). I focused on the prey choice of the spiders by excluding predator immigration and reproduction. In accordance with predator switching, survival of leafhoppers increased in the presence of aquatic subsidies. By contrast, the presence of aquatic subsidies indirectly reduced weevils and herbivory.
In chapter 3, I present the results on the taxonomic and trait response of riparian spider communities to gradients of agricultural stressors and environmental variables, with a particular emphasis on pesticides. To capture spiders with different traits and survival strategies, we used multiple collection methods. Spider community composition was best explained by in-stream pesticide toxicity and shading of the stream bank, a proxy for the quality of the habitat. Species richness and the number of spider individuals, as well as community ballooning ability, were negatively associated with in-stream pesticide toxicity. In contrast, mean body size and shading preference of spider communities responded strongest to shading,
whereas mean niche width (habitat preference for moisture and shading) responded strongest to other environmental variables.
In chapter 4, I describe aquatic-terrestrial predator-prey relations with gradients of agricultural stressors and environmental variables. I sampled spiders, as well as their aquatic and terrestrial prey along streams with an assumed pesticide pollution gradient and determined their stable carbon and nitrogen signals. Potential aquatic prey biomass correlated positively with an increasing aquatic prey contribution of T. montana. The contribution of aquatic prey to the diet of P. amentata showed a positive relationship with increasing toxicity in streams.
Overall, this thesis contributes to the emerging discipline of cross-ecosystem ecology and shows that aquatic-terrestrial linkages and riparian food webs can be influenced by land use related stressors. Future manipulative field studies on aquatic-terrestrial linkages are required that consider the quality of prey organisms, fostering mechanistic understanding of such crossecosystem effects. Knowledge on these linkages is important to improve understanding of consequences of anthropogenic stressors and to prevent further losses of ecosystems and their biodiversity.
Various best practices and principles guide an ontology engineer when modeling Linked Data. The choice of appropriate vocabularies is one essential aspect in the guidelines, as it leads to better interpretation, querying, and consumption of the data by Linked Data applications and users.
In this paper, we present the various types of support features for an ontology engineer to model a Linked Data dataset, discuss existing tools and services with respect to these support features, and propose LOVER: a novel approach to support the ontology engineer in modeling a Linked Data dataset. We demonstrate that none of the existing tools and services incorporate all types of supporting features and illustrate the concept of LOVER, which supports the engineer by recommending appropriate classes and properties from existing and actively used vocabularies. Hereby, the recommendations are made on the basis of an iterative multimodal search. LOVER uses different, orthogonal information sources for finding terms, e.g. based on a best string match or schema information on other datasets published in the Linked Open Data cloud. We describe LOVER's recommendation mechanism in general and illustrate it alongrna real-life example from the social sciences domain.