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Information systems research has started to use crowdsourcing platforms such as Amazon Mechanical Turks (MTurk) for scientific research, recently. In particular, MTurk provides a scalable, cheap work-force that can also be used as a pool of potential respondents for online survey research. In light of the increasing use of crowdsourcing platforms for survey research, the authors aim to contribute to the understanding of its appropriate usage. Therefore, they assess if samples drawn from MTurk deviate from those drawn via conventional online surveys (COS) in terms of answers in relation to relevant e-commerce variables and test the data in a nomological network for assessing differences in effects.
The authors compare responses from 138 MTurk workers with those of 150 German shoppers recruited via COS. The findings indicate, inter alia, that MTurk workers tend to exhibit more positive word-of mouth, perceived risk, customer orientation and commitment to the focal company. The authors discuss the study- results, point to limitations, and provide avenues for further research.
Diese Arbeit beschäftigt sich mit Information Audit Methodologien und Methoden zur Informationserfassung in Enterprise Social Software. Die Erfassung von Informationsressourcen ist ein elementarer Bestandteil des Information Audit. Das Fehlen einer standardisierten Definition und von standardisierten Methodologien für Information Auditing ist begründet durch den weit gefächerten Anwendungsbereich des Information Audit und durch seine notwendige individuelle Anpassbarkeit an die Bedürfnisse der durchführenden Organisationen. Die Vorteile von Information Auditing und die möglichen Herausforderung durch Enterprise 2.0, die mit Hilfe des Audits überwunden werden können, sind weitreichend und stellen einen Anreizpunkt für Manager einen Information Audit durchzuführen. Information Asset Register als Ausgangspunkt für erfolgreiches Information Auditing berücksichtigen noch nicht die besonderen Herausforderungen von Enterprise 2.0. Deshalb spannt dieses Forschungsprojekt einen Bogen von Information Asset Registern aus verschiedenen Einflussbereichen und kombiniert diese, um ein neuartiges Asset Register, welches die besonderen Anforderungen von Enterprise 2.0 berücksichtigt, zu erstellen. Die notwendigen Anpassungen, die durch die neuen Charakteristika der Informationsressourcen verursacht werden, sind von geringem Ausmaß. Das neu entwickelte Asset Register wird im abschließenden Teil der Arbeit in einer Fallstudie angewendet und zeigt mögliche Problembereiche, die beim Zusammenstellen des Registers auftreten können, auf.
Als Abschluss der Arbeit wird eine Vorlage entwickelt, welche Nutzern von Enterprise Social Software beim Erstellen von neuen Arbeitsbereichen behilflich sein wird, diese mit passenden Metadaten, wie sie bereits im Information Asset Register festgehalten werden, zu versehen.
Wir analysieren versionsbasierte Softwareprojekte, um den Entwicklern API- und Domänen-Wissen zuzuordnen. Genauer gesagt analysieren wir die einzelnen Commits in einem Repository in Hinblick auf die API-Nutzung. Auf dieser Grundlage können wir APIs (oder Teile davon) den Entwicklern zuordnen und dadurch auf die API-Erfahrung der Entwickler schließen. Im transitiven Schluss können wir auf Domänen-Erfahrung schließen, da jeder API eine Programmierdomäne zugewiesen wird.
The intention of this thesis was to characterise the effect of naturally occurring multivalent cations like Calcium and Aluminium on the structure of Soil Organic Matter (SOM) as well as on the sorption behaviour of SOM for heavy metals such as lead.
The first part of this thesis describes the results of experiments in which the Al and Ca cation content was changed for various samples originated from soils and peats of different regions in Germany. The second part focusses on SOM-metal cation precipitates to study rigidity in dependence of the cation content. In the third part the effects of various cation contents in SOM on the binding strength of Pb cations were characterised by using a cation exchange resin as desorption method.
It was found for soil and peat samples as well as precipitates that matrix rigidity was affected by both type and content of cation. The influence of Ca on rigidity was less pronounced than the influence of Al and of Pb used in the precipitation experiments. For each sample one cation content was identified where matrix rigidity was most pronounced. This specific cation content is below the cation saturation as expected by cation exchange capacity. These findings resulted in a model describing the relation between cation type, content and the degree of networking in SOM. For all treated soil and precipitate samples a step transition like glass transition was observed, determined by the step transition temperature T*. It is known from literature that this type of step transition is due to bridges between water molecules and organic functional groups in SOM. In contrast to the glass transition temperature this thermal event is slowly reversing after days or weeks depending on the re-conformation of the water molecules. Therefore, changes of T* with different cation compositions in the samples are explained by the formation of water-molecule-cation bridges between SOM-functional groups. No influence on desorption kinetics of lead for different cation compositions in soil samples was observed. Therefore it can be assumed that the observed changes of matrix rigidity are highly reversible by changing the water status, pH or putting agitation energy by shaking in there.
Geographisches Cluster-basiertes Routing ist ein aktueller Ansatz, wenn es um das Entwicklen von effizienten Routingalgorithmen für drahtlose ad-hoc Netzwerke geht. Es gibt bereits eine Anzahl an Algorithmen, die Nachrichten nur auf Basis von Positionsinformationen durch ein drahtloses ad-hoc Netzwerk routen können. Darunter befinden sich sowohl Algorithmen, die auf das klassische Beaconing setzen, als auch Algorithmen, die beaconlos arbeiten (keine Informationen über die Umgebung werden benötigt, außer der eigenen Position und der Position des Ziels). Geographisches Routing mit Auslieferungsgarantie kann auch auf Overlay-Graphen durchgeführt werden. Bisher werden die dafür benötigten Overlay-Graphen nicht reaktiv konstruiert.
In dieser Arbeit wird ein reaktiver Algorithmus, der Beaconless Cluster Based Planarization Algorithmus (BCBP), für die Konstruktion eines planaren Overlay-Graphen vorgestellt, der die benötigte Anzahl an Nachrichten für die Konstruktion eines planaren Overlay-Graphen, und demzufolge auch Cluster-basiertes geographishes Routing, deutlich reduziert. Basierend auf einem Algorithmus für Cluster-basierte Planarisierung, konstruiert er beaconlos einen planaren Overlay-Graphen in einem unit disk graph (UDG). Ein UDG ist ein Modell für ein drahtloses Netzwerk, bei dem alle Teilnehmer den gleichen Senderadius haben.
Die Evaluierung des Algorithmus zeigt, dass er wesentlich effizienter ist als die Baecon-basierte Variante. Ein weiteres Ergebnis dieser Arbeit ist ein weiterer beaconloser Algorithmus (Beaconless LLRAP (BLLRAP)), für\r\nden zwar die Planarität, aber nicht die Konnektivität nachgewiesen werden konnte.
In dieser Arbeit präsentieren wir Methoden zum Schätzen von Kamerabewegungen einer RGB-D-Kamera in sechs Freiheitsgraden und dem Erstellen von 3D-Karten. Als erstes werden die RGB- und Tiefendaten registriert und synchronisiert. Nach der Vorverarbeitung extrahieren wir FAST-Merkmale in zwei aufeinander folgenden Bildern. Daraus wird eine Korrespondenzmenge erstellt und Ausreißer werden herausgefiltert. Anschließend projizieren wir die Korrespondenzmenge in 3D, um die Bewegung aus 3D-3D-Korrespondezen mittels Least-Squares zu bestimmen. Weiterhin präsentieren wir Methoden, um 3D-Karten aus Bewegungsschätzungen und RGB-D-Daten zu erstellen. Dafür benutzen wir das OctoMap-Framework und erstellen wahlweise auch inkrementelle Karten aus Punktewolken. Anschließend evaluieren wir das System mit dem weit verbreiteten RGB-D-Benchmark.
Unstrukturierte Textdokumente enthalten viele Informationen, die heutzutage mit automatisierten Methoden extrahiert werden können. In dieser Arbeit wird ein Framework entwickelt, mit dessen Hilfe ein Evaluationsschema zur Evaluation von Textverarbeitungstools erarbeitet wird. Das Evaluationsschema basiert auf der Modelabhängigen Softwarevaluation und der modelabhängige Teil basiert auf dem Verarbeitungsprozess, der von dem Conceptual Analysis Process abgeleitet ist. Der Conceptual Analysis Process ist im Rahmen des GLODERS Projektes entwickelt wurden. GLODERS ist ein EU-Projekt mit dem Fokus, ein IKT Modell zu entwickeln, welches helfen soll, Extortion Racket Systems besser zu verstehen. Im Rahmes des GLODERS Projektes wurden Gerichtsdokumente eines Falles in Deutschland zu Verfügungrngestellt, die in dieser Arbeit die Datengrundlage stellen. Zum Schutz involvierter Personen sind die Daten anonymisiert. Mit dem entwickelten Schema werden dann sechs verschiedene Softwarelösungen in Bezug auf die automatisierte Verarbeitungrnvon unstrukturierten Textdokumenten evaluiert.
Paketmanager für Quellcode wie zum Beispiel Cabal verwalten unter anderem die Abhängigkeiten zwischen Paketen. Softwareprojekte nutzen jedoch selten sämtliche Funktionalitäten, die ihre Abhängigkeiten bereitstellen. Das führt zur unnötigen Kompilation unbenutzter Code-Fragmente und zu vermeintlichen Versionskonflikten, wo gar keine Konflikte sind. In zwei Fallstudien zeigen wir, wie relevant diese zwei Probleme sind. Danach beschreiben wir, wie wir sie vermeiden können, indem wir Abhängigkeiten nicht zwischen ganzen Paketen, sondern zwischen einzelnen Code-Fragmenten feststellen.
The increasing, anthropogenic demand for chemicals has created large environmental problems with repercussions for the health of the environment, especially aquatic ecosystems. As a result, the awareness of the public and decision makers on the risks from chemical pollution has increased over the past half-century, prompting a large number of studies in the field of ecological toxicology (ecotoxicology). However, the majority of ecotoxicological studies are laboratory based, and the few studies extrapolating toxicological effects in the field are limited to local and regional levels. Chemical risk assessment on large spatial scales remains largely unexplored, and therefore, the potential large-scale effects of chemicals may be overlooked.
To answer ecotoxicological questions, multidisciplinary approaches that transcend classical chemical and toxicological concepts are required. For instance, the current models for toxicity predictions - which are mainly based on the prediction of toxicity for a single compound and species - can be expanded to simultaneously predict the toxicity for different species and compounds. This can be done by integrating chemical concepts such as the physicochemical properties of the compounds with evolutionary concepts such as the similarity of species. This thesis introduces new, multidisciplinary tools for chemical risk assessments, and presents for the first time a chemical risk assessment on the continental scale.
After a brief introduction of the main concepts and objectives of the studies, this thesis starts by presenting a new method for assessing the physiological sensitivity of macroinvertebrate species to heavy metals (Chapter 2). To compare the sensitivity of species to different heavy metals, toxicity data were standardized to account for the different laboratory conditions. These rankings were not significantly different for different heavy metals, allowing the aggregation of physiological sensitivity into a single ranking.
Furthermore, the toxicological data for macroinvertebrates were used as input data to develop and validate prediction models for heavy metal toxicity, which are currently lacking for a wide array of species (Chapter 3). Apart from the toxicity data, the phylogenetic information of species (evolutionary relationships among species) and the physicochemical parameters for heavy metals were used. The constructed models had a good explanatory power for the acute sensitivity of species to heavy metals with the majority of the explained variance attributed to phylogeny. Therefore, the integration of evolutionary concepts (relatedness and similarity of species) with the chemical parameters used in ecotoxicology improved prediction models for species lacking experimental toxicity data. The ultimate goal of the prediction models developed in this thesis is to provide accurate predictions of toxicity for a wide range of species and chemicals, which is a crucial prerequisite for conducting chemical risk assessment.
The latter was conducted for the first time on the continental scale (Chapter 4), by making use of a dataset of 4,000 sites distributed throughout 27 European countries and 91 respective river basins. Organic chemicals were likely to exert acute risks for one in seven sites analyzed, while chronic risk was prominent for almost half of the sites. The calculated risks are potentially underestimated by the limited number of chemicals that are routinely analyzed in monitoring programmes, and a series of other uncertainties related with the limit of quantification, the presence of mixtures, or the potential for sublethal effects not covered by direct toxicity.
Furthermore, chemical risk was related to agricultural and urban areas in the upstream catchments. The analysis of ecological data indicated chemical impacts on the ecological status of the river systems; however, it is difficult to discriminate the effects of chemical pollution from other stressors that river systems are exposed to. To test the hypothesis of multiple stressors, and investigate the relative importance of organic toxicants, a dataset for German streams is used in chapter 5. In that study, the risk from abiotic (habitat degradation, organic chemicals, and nutrients enrichment) and biotic stressors (invasive species) was investigated. The results indicated that more than one stressor influenced almost all sites. Stream size and ecoregions influenced the distribution of risks, e.g., the risks for habitat degradation, organic chemicals and invasive species increased with the stream size; whereas organic chemicals and nutrients were more likely to influence lowland streams. In order to successfully mitigate the effects of pollutants in river systems, co-occurrence of stressors has to be considered. Overall, to successfully apply integrated water management strategies, a framework involving multiple environmental stressors on large spatial scales is necessary. Furthermore, to properly address the current research needs in ecotoxicology, a multidisciplinary approach is necessary which integrates fields such as, toxicology, ecology, chemistry and evolutionary biology.
Um unterschiedliche Anforderungen zu erfüllen, werden Softwaresysteme oft in Form einer Menge von Varianten entwickelt. Zwei gebräuchliche Ansätze für eine solche Softwareentwicklung sind das clone-and-owning und die Produktlinienentwicklung. Beide Ansätze haben Vor- und Nachteile. In vorheriger Arbeit mit anderen haben wir eine Idee vorgestellt bei der beide Ansätze verknüpft werden um Varianten, Ähnlichkeiten und Softwareklone zu verwalten. Diese Idee basiert auf einer virtuellen Plattform und Operatoren für Softwareklone. In der vorliegenden Arbeit stellen wir einen Ansatz vor um essentielle Metadaten für die Realisierung eines propagate-Operators zu aggregieren. Dafür haben wir ein System entwickelt um Ähnlichkeiten mit Annotationen zu versehen, wobei die Ähnlichkeiten aus der Historie eines Repositories extrahiert werden. Die Annotationen drücken aus wie eine Ähnlichkeit zukünftig gewartet werden soll. Abhängig vom Annotationstyp kann diese Wartung automatisiert ausgeführt oder sie muss vom Benutzer manuell betrieben werden. In dieser Arbeit beschreiben wir die automatisierte Extraktion von Metadaten und das System zur Annotation von Ähnlichkeiten; wir erklären wie das System in den Arbeitsfluss eines bestehenden Programms zur Versionierungverwaltung (Git) integriert werden kann; und abschließend stellen wir eine Fallstudie vor, die das 101haskell-System benutzt.