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Ziel dieser Arbeit ist es, ein Recommender System (RS) für Geschäftsprozesse zu erstellen, das auf dem bestehenden ProM-Plug-in RegPFA aufbaut. Um dies zu gewährleisten, soll zunächst eine Schnittstelle geschaffen werden, welche die von RegPFA erstellten probabilistischen endlichen Automaten (PFA) im tsml-Format zu einer erweiterbaren Datenbasis zusammenfassen kann. Anschließend soll ein Java-Programm geschrieben werden, das mithilfe dieser Datenbasis zu einem gegebenen Teilprozess die wahrscheinlichsten Empfehlungen für das nächstfolgende Prozesselement angibt.
Das Internet of Things (IoT) ist ein schnell wachsendes, technologisches Konzept, das darauf abzielt, verschiedenste physikalische und virtuelle Objekte in einem globalen Netzwerk zu vereinen um Interaktion und Kommunikation zwischen diesen Objekten zu ermöglichen (Atzori, Iera and Morabito, 2010). Die Einsatzmöglichkeiten dieser Technologie sind vielfältig und könnten Gesellschaft und Wirtschaft in ähnlicher Weise verändern wie die Nutzung des Internets (Chase, 2013). Darüber hinaus nimmt das Internet of Things eine zentrale Rolle in der Realisation von visionären Zukunftskonzepten ein, beispielsweise Smart City oder Smart Healthcare. Zudem verspricht die Anwendung dieser Technologie Möglichkeiten, verschiedene Aspekte der Nachhaltigkeit zu verbessern und zu einem bewussteren, effizienteren und schonenderen Umgang mit natürlichen Ressourcen beizutragen (Maksimovic, 2017). Das Handlungsprinzip der Nachhaltigkeit gewinnt im gesellschaftlichen und akademischen Diskurs zunehmend an Bedeutung und trägt den teils schädlichen Produktions- und Konsummustern des vergangenen Jahrhunderts Rechnung (Mcwilliams et al., 2016). Im Zusammenhang mit Nachhaltigkeit ist die fortschreitende Verbreitung von IoT Technologie allerdings auch mit Risiken verknüpft, die im Rahmen des Vorsorgeprinzips rechtzeitig bedacht werden müssen (Harremoës et al., 2001). Dazu zählen der massive Energie- und Rohstoffbedarf der Produktion und des Betriebs von IoT Objekten, sowie deren Entsorgung (Birkel et al., 2019). Die genauen Zusammenhänge und Auswirkungen von IoT im Bezug auf Nachhaltigkeit sind bisher nur unzureichend erforscht und nehmen keine zentrale Rolle in der Diskussion dieser Technologie ein (Behrendt, 2019). Diese Arbeit hat daher das Ziel, einen umfassenden Überblick der Zusammenhänge zwischen IoT Technologie und Nachhaltigkeitsaspekten zu erarbeiten.
Um dieses Ziel zu verwirklichen, verwendet diese Arbeit die Grounded Theory Methodik in Verbindung mit einer umfassenden Literaturanalyse. Die analysierte Literatur besteht dabei aus Forschungsbeiträgen, die besonders dem Gebiet der Informationstechnik (IT) entstammen. Auf Grundlage dieser Literaturanalyse wurden Aspekte, Lösungsansätze, Effekte und Barrieren im Kontext von IoT und Nachhaltigkeit erarbeitet. Im Laufe der Analyse kristallisierten sich zwei zentrale Sichtweisen auf IoT im Zusammenhang mit Nachhaltigkeit heraus. IoT für Nachhaltigkeit (IoT4Sus) beschreibt dabei den Einsatz und die Nutzung von IoT generierten Informationen, um eine Verbesserung im Hinblick auf verschiedene Nachhaltigkeitsaspekte zu erzielen. Nachhaltigkeit für IoT (Sus4IoT) hingegen fokussiert Nachhaltigkeitsaspekte der eingesetzten Technologie und zeigt Lösungen auf um, mit der Produktion und dem Betrieb verknüpfte, negative Auswirkungen auf Nachhaltigkeit zu verringern. Die erarbeiteten Aspekte und Beziehungen wurden in einem umfangreichen Rahmenwerk, dem CCIS Framework, festgehalten und dargestellt. Dieses Rahmenwerk stellt ein Werkzeug zur Erfassung relevanter Aspekte und Beziehungen in diesem Bereich dar und trägt damit zur Bewusstseinsbildung in diesem Kontext bei. Darüber hinaus empfiehlt das Rahmenwerk ein Handlungsprinzip um die Performance von IoT Systemen im Rahmen der Nachhaltigkeit zu optimieren.
Der zentrale Beitrag dieser Arbeit besteht in der Bereitstellung des CCIS Framework, sowie der darin enthaltenen Informationen hinsichtlich der Aspekte und Beziehungen von IoT und Nachhaltigkeit.
Railway safety is a topic which gains the public attention only if major railway accidents happen. This is because railway is considered as a safe mode of travel by the public. However, to ensure the safety of the railway system railway companies as well as universities conduct a broad spectrum of research. An overview of this research has not yet been provided in the scholarly literature. Therefore, this thesis follows two objectives. First an overview and ranking of railway safety research universities should be provided. Second, based on these universities, it should be identified which are the most relevant and influential research topics. The ranking is based on the research method “literature review” which forms the methodical basis for this thesis. To evaluate the universities based on a measurable and objective criterion, the number of citations of the researchers from each university is gathered. As a result, the University of Leuven for the civil engineering, Milan Politechnico for mechanical enginering and the University of Loughborough for electrical engineering are identified as the leading university in their field of railway safety research. The top universities for each discipline are distributed all over Europe, North America and Asia. However, a clear focus on the US and British universities is observed. For identification of the most relevant and influential topics the keywords from the publications which are considered in the ranking procedure are analyzed. Focus areas among these keywords are revealed by calculating the count of each keyword. High-speed trains as well as maintenance are recognized as the highly relevant topics in both civil and mechanical engineering. Furthermore, the topic of railway dynamics for mechanical engineering and noise and vibration for civil engineering are identified as the leading topics in the respective discipline. Achieving both research goals required exploratory approaches. Therefore, this thesis leaves open space for future research to deepen the individual topics which are approached in each section. A validation of the results through experts interviews as well as a deepening of the analysis through increasing the number of analyzed universities as well as applying statistical methods is recommended.
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.
Die vorliegende Dissertation beschäftigt sich mit der Messung subjektiver Filmbewertungskriterien (SMEC). SMEC können definiert werden als Standards, die Zuschauer heranziehen, um Eigenschaften von Filmen (z. B. Story, Kamera) zu bewerten. Basierend auf Annahmen aus der Social Cognition Forschung können SMEC als mentale Repräsentationen von - oder Einstellungen gegenüber - spezifischen Filmeigenschaften verstanden werden und spielen eine wichtige Rolle bei der kognitiven und affektiven Informationsverarbeitung und Bewertung von Filmen. In fünf Phasen wurden Skalen zur Erfassung von SMEC entwickelt und validiert. In Phase I wurden mithilfe von offenen Fragen Beschreibungen für Filmbewertungskriterien gesammelt, mittels modifizierter Struktur-Lege-Technik inhaltsvalidiert und schließlich Itemformulierungen abgeleitet. In Phase II wurden die Items reduziert und faktorenanalytisch auf ihre latente Struktur untersucht. Das resultierende 8-Faktoren-Modell wurde anschließend in Phase III mithilfe weiterer Stichproben und konfirmatorischer Verfahren kreuzvalidiert. Latent State-Trait Analysen in Phase IV zeigten, dass es sich um reliable und relativ stabile Dimensionen handelt. Schließlich wurde in Phase V das nomologische Netzwerk der SMEC und verwandter Konstrukte (z. B. Filmbewertungen) untersucht. Insgesamt kann festgestellt werden, dass das SMEC-Konzept einen geeigneten Rahmen bietet, um Forschungsfragen zur Rolle von Filmbewertungskriterien und Bewertungsprozessen bei der Selektion, Rezeption und Wirkung von Filmen zu formulieren und dass die SMEC-Skalen ein geeignetes reliables und valides Instrument zur Untersuchung solcher Fragen darstellen.
In this paper, we compare two approaches for exploring large,rnhierarchical data spaces of social media data on mobile devicesrnusing facets. While the first approach arranges thernfacets in a 3x3 grid, the second approach makes use of arnscrollable list of facets for exploring the data. We have conductedrna between-group experiment of the two approachesrnwith 24 subjects (20 male, 4 female) executing the same set ofrntasks of typical mobile users" information needs. The resultsrnshow that the grid-based approach requires significantly morernclicks, but subjects need less time for completing the tasks.rnFurthermore, it shows that the additional clicks do not hamperrnthe subjects" satisfaction. Thus, the results suggest thatrnthe grid-based approach is a better choice for faceted searchrnon touchscreen mobile devices. To the best of our knowledge,rnsuch a summative evaluation of different approaches for facetedrnsearch on mobile devices has not been done so far.
One of the main goals of the artificial intelligence community is to create machines able to reason with dynamically changing knowledge. To achieve this goal, a multitude of different problems have to be solved, of which many have been addressed in the various sub-disciplines of artificial intelligence, like automated reasoning and machine learning. The thesis at hand focuses on the automated reasoning aspects of these problems and address two of the problems which have to be overcome to reach the afore-mentioned goal, namely 1. the fact that reasoning in logical knowledge bases is intractable and 2. the fact that applying changes to formalized knowledge can easily introduce inconsistencies, which leads to unwanted results in most scenarios.
To ease the intractability of logical reasoning, I suggest to adapt a technique called knowledge compilation, known from propositional logic, to description logic knowledge bases. The basic idea of this technique is to compile the given knowledge base into a normal form which allows to answer queries efficiently. This compilation step is very expensive but has to be performed only once and as soon as the result of this step is used to answer many queries, the expensive compilation step gets worthwhile. In the thesis at hand, I develop a normal form, called linkless normal form, suitable for knowledge compilation for description logic knowledge bases. From a computational point of view, the linkless normal form has very nice properties which are introduced in this thesis.
For the second problem, I focus on changes occurring on the instance level of description logic knowledge bases. I introduce three change operators interesting for these knowledge bases, namely deletion and insertion of assertions as well as repair of inconsistent instance bases. These change operators are defined such that in all three cases, the resulting knowledge base is ensured to be consistent and changes performed to the knowledge base are minimal. This allows us to preserve as much of the original knowledge base as possible. Furthermore, I show how these changes can be applied by using a transformation of the knowledge base.
For both issues I suggest to adapt techniques successfully used in other logics to get promising methods for description logic knowledge bases.
Knowledge compilation is a common technique for propositional logic knowledge bases. A given knowledge base is transformed into a normal form, for which queries can be answered efficiently. This precompilation step is expensive, but it only has to be performed once. We apply this technique to concepts defined in the Description Logic ALC. We introduce a normal form called linkless normal form for ALC concepts and discuss an efficient satisability test for concepts given in this normal form. Furthermore, we will show how to efficiently calculate uniform interpolants of precompiled concepts w.r.t. a given signature.
The European weatherfish (Misgurnus fossilis) is a benthic freshwater fish species belonging to the family Cobitidae, that is subjected to a considerable decline in many regions across its original distribution range. Due to its cryptic behavior and low economic value, the causes of threat to weatherfish remained partly unknown and the species is rarely at the center of conservation efforts. In order to address these concerns, the overall aim of the present thesis was to provide a comprehensive approach for weatherfish conservation, including the development of stocking measures, investigations on the species autecology and the evaluation of potential threats. The first objective was to devise and implement a regional reintroduction and stock enhancement program with hatchery-reared weatherfish in Germany. Within this program (2014-2016), a total number of 168,500 juvenile weatherfish were stocked to seven water systems. Recaptures of 45 individuals at two reintroduction sites supported the conclusion that the developed stocking strategy was appropriate. In order to broaden the knowledge about weatherfish autecology and thereby refining the rearing conditions and the selection of appropriate stocking waters, the second objective was to investigate the thermal requirements of weatherfish larvae. Here, the obtained results revealed that temperatures higher than previously suggested were tolerated by larvae, whereas low temperatures within the range of likely habitat conditions increased mortality rates. As weatherfish can be frequently found in agriculturally impacted waters (e.g. ditch systems), they are assumed to have an increased probability to be exposed to chemical stress. Since the resulting risk has not yet been investigated with a focus on weatherfish, the third objective was to provide a methodical foundation for toxicity testing that additionally complies with the requirements of alternative test methods. For this purpose, the acute fish embryo toxicity test was successfully transferred to weatherfish and first results exhibited that sensitivity of weatherfish towards a tested reference substance (3,4-dichloroaniline) was highest compared to other species. On the basis of these findings, the fourth objective was to apply weatherfish embryos for multiple sediment bioassays in order to investigate teratogenic effects derived from sediment-associated contaminants. In this context, weatherfish revealed particular sensitivity to water extractable substances, indicating that sediment contamination might pose a considerable risk. Moreover, as an endangered benthic fish species with high ecological relevance for European waters that are specifically exposed to hazardous contaminants, the weatherfish might be a prospective species for an ecological risk assessment of sediment toxicity. Overall, the present thesis contributed to the conservation of weatherfish by considering a variety of aspects that interact and reinforce one another in order to achieve improvements for the species situation.
To assess the effect of organic compounds on the aquatic environment, organisms are typically exposed to toxicant solutions and the adverse effects observed are linked to the concentration in the surrounding media. As compounds generally need to be taken up into the organism and distributed to the respective target sites for the induction of effects, the internal exposure is postulated to best represent the observed effects.
The aim of this work is to contribute to an improved effect assessment of organic compounds by describing experimental and modelling methods to obtain information on the internal exposure of contaminants in organisms.
Chapter 2 details a protocol for the determination of bioconcentration parameter for uptake (k1) and elimination (k2) of organic compounds in zebrafish (Danio rerio) eggs. This enables the simulation of the internal exposure in zebrafish eggs from an ambient exposure concentration over time. The accumulated contaminant amount in zebrafish eggs was also determined, using a biomimetic extraction method. Different bioconc-entration estimation models for the determination of internal steady-state concentrat-ion of pharmaceutical compounds in fish to an environmental exposure are presented in Chapter 3. Bioconcentration factors were estimated from the compounds octanol: water partition coefficient (KOW) to determine the internal exposure to an ambient concentration.
To assess the integral bioavailable fraction from the water and sediment phase of environmental contaminants for rooted aquatic plants, the internal exposure in river-living Myriophyllum aquaticum plants were determined over time, presented in Chapter 4. The plants were collected at different time points, with the accumulated organic contaminants determined using a liquid extraction method.
In Chapter 5 a protocol was established to enable the non-invasive observation of effects in M. aquaticum plants exposed to contaminated sediments over time. Since the toxicant effects are a result of all uptake and distribution processes to the target site and the toxico-dynamic process leading to an observed effect during static exposure, information on the internal exposure could thus be gained from the temporal effect expression.rn