Filtern
Erscheinungsjahr
Dokumenttyp
- Ausgabe (Heft) zu einer Zeitschrift (84) (entfernen)
Sprache
- Englisch (84) (entfernen)
Schlagworte
- Bluetooth (4)
- ontology (4)
- Knowledge Compilation (3)
- computer clusters (3)
- Campus Information System (2)
- E-KRHyper (2)
- Equality (2)
- Linked Open Data (2)
- OWL (2)
- Ontology (2)
- Petri-Netze (2)
- Semantic Web (2)
- Theorem Proving (2)
- University (2)
- artificial neural networks (2)
- classification (2)
- constraint logic programming (2)
- mobile phone (2)
- multimedia metadata (2)
- parallel algorithms (2)
- probability propagation nets (2)
- risk (2)
- social media (2)
- ABox (1)
- Adaptive Services Grid (ASG) (1)
- Amazon Mechanical Turks (1)
- Augmented Reality (1)
- Automated Theorem Proving (1)
- Automated Theorem Proving Systems (1)
- Bayes Procedures (1)
- COVID-19 (1)
- Calculus (1)
- Cloud Computing (1)
- Computer Supported Cooperative Work (1)
- Conference (1)
- Context-aware processes (1)
- Core Ontology on Multimedia (1)
- Core Ontology on Multimedia (COMM) (1)
- Creativity (1)
- Crowdsourcing (1)
- DPLL procedure (1)
- Description Logic (1)
- Description Logics (1)
- Discussion Forums (1)
- Distributed process execution (1)
- E-KRHyper theorem prover (1)
- E-government (1)
- E-services (1)
- Enhanced Reality (1)
- Enterprise Systems (1)
- Generative Model (1)
- Graph Technology (1)
- Healthcare institution (1)
- Heimarbeit (1)
- Horn Clauses (1)
- Hyper Tableau Calculus (1)
- IASON (1)
- IT Outsourcing (1)
- IT Security (1)
- IT Services (1)
- Image (1)
- Intelligent Information Network (1)
- Internet (1)
- Internet Voting (1)
- KRHyper (1)
- Knowledge Sharing (1)
- Linked Data Modeling (1)
- MIA (1)
- MPEG-7 (1)
- Mixed method (1)
- Mobile Information Systems (1)
- Model-Driven Engineering (1)
- Multi-robot System (1)
- Multiagent System (1)
- Multimedia Metadata Ontology (1)
- Neuronales Netz (1)
- ODRL (1)
- Object Recognition (1)
- Online Community (1)
- Ontology alignment (1)
- POIs (1)
- Personalised Information Systems (1)
- Petri Nets (1)
- Petri net (1)
- Petrinetz (1)
- Probability (1)
- Probability propagation nets (1)
- Process tracing (1)
- Propagation (1)
- Quality assessment system (1)
- RDF (1)
- RDF Graphs (1)
- RDF modeling (1)
- Railway Research (1)
- Railway Research Topics (1)
- Railway Safety (1)
- Railway Safety Research (1)
- ReDSeeDS-Project (1)
- Resource Description Framework (RDF) (1)
- Robocup 2008 (1)
- Routing Information Protocol (RIP) (1)
- Routing Loops (1)
- Routing with Metric based Topology Investigation (RMTI) (1)
- SPARQL (1)
- Schema Information (1)
- Search engine (1)
- Security (1)
- Semantics (1)
- Service-oriented Architectures (SOA) (1)
- Social Networking Platforms (1)
- Software Development (1)
- Software techniques for object recognition (STOR) (1)
- Stochastic Logic (1)
- Support System (1)
- Survey Research (1)
- TAP (1)
- TBox (1)
- Tableau Calculus (1)
- Telearbeit (1)
- Theorem prover (1)
- Tokens (1)
- Traceability (1)
- UML (1)
- Umfrage (1)
- Unified Modeling Language (UML ) (1)
- Vocabulary Mapping (1)
- Vocabulary Reuse (1)
- Web Ontology Language (OWL) (1)
- Website (1)
- Wechselkursänderung (1)
- Werbung (1)
- Word-of-Mouth (1)
- XML (1)
- adaptive resonance theory (1)
- application programming interfaces (1)
- artifcial neural networks (1)
- artiffficial neural networks (1)
- artififfcial neural networks (1)
- assessment model (1)
- blood analysis (1)
- business process management (1)
- categorisation (1)
- core ontologies (1)
- currency exchange rates (1)
- delivery drone (1)
- design thinking (1)
- digital workplace (1)
- directed acyclic graphs (1)
- drone (1)
- e-Commerce (1)
- e-learning (1)
- e-service (1)
- e-service quality (1)
- entrepreneurial design thinking (1)
- entrepreneurial thinking (1)
- entrepreneurship education (1)
- estimation of algorithm efficiency (1)
- event model (1)
- event-based systems (1)
- events (1)
- faceted search (1)
- finite state automata (1)
- first-order logic (1)
- gaze information (1)
- governance (1)
- gradient method of training weight coefficients (1)
- hybrid automata (1)
- hybrid systems (1)
- hybrid work (1)
- iCity project (1)
- image processing (1)
- image semantics (1)
- information system (1)
- knowledge management system (1)
- knowledge work (1)
- living book (1)
- mathematical model (1)
- media competence model (1)
- metadata formats (1)
- metadata standards (1)
- methodology (1)
- minimum self-contained graphs (1)
- mobile application (1)
- mobile devices (1)
- mobile facets (1)
- mobile interaction (1)
- model generation (1)
- multi-agent systems (1)
- parallel calculations (1)
- personal information management (1)
- persönliches Informationsmanagement (1)
- points of interest (1)
- privacy and personal data (1)
- privacy competence model (1)
- privacy protection (1)
- public key infrastructure (1)
- regression analysis (1)
- regular dag languages (1)
- remote work (1)
- rich multimedia presentations (1)
- risks (1)
- scene analysis (1)
- security awareness (1)
- semantic annotation (1)
- semantic desktop (1)
- semantics (1)
- semantischer Desktop (1)
- sequent calculi (1)
- social media data (1)
- social object (1)
- social simulation (1)
- summative evaluation (1)
- tagging (1)
- teams (1)
- technology acceptance model (1)
- time series (1)
- tracking (1)
- virtual goods (1)
- visualization (1)
- web-portal medical e-services (1)
- work from anywhere (1)
- work from home (1)
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.
We propose a new approach for mobile visualization and interaction of temporal information by integrating support for time with today's most prevalent visualization of spatial information, the map. Our approach allows for an easy and precise selection of the time that is of interest and provides immediate feedback to the users when interacting with it. It has been developed in an evolutionary process gaining formative feedback from end users.
Designing Core Ontologies
(2011)
One of the key factors that hinders integration of distributed, heterogeneous information systems is the lack of a formal basis for modeling the complex, structured knowledge that is to be exchanged. To alleviate this situation, we present an approach based on core ontologies. Core ontologies are characterized by a high degree of axiomatization and formal precision. This is achieved by basing on a foundational ontology. In addition, core ontologies should follow a pattern-oriented design approach. By this, they are modular and extensible. Core ontologies allow for reusing the structured knowledge they define as well as integrating existing domainrnknowledge. The structured knowledge of the core ontologies is clearly separated from the domain-specific knowledge. Such core ontologies allow for both formally conceptualize their particular fields and to be flexibly combined to cover the needsrnof concrete, complex application domains. Over the last years, we have developed three independent core ontologies for events and objects, multimedia annotations, and personal information management. In this paper, we present the simultaneousrnuse and integration of our core ontologies at the example of a complex, distributed socio-technical system of emergency response. We describe our design approach for core ontologies and discuss the lessons learned in designing them. Finally, we elaborate on the beauty aspects of our core ontologies.
Schema information about resources in the Linked Open Data (LOD) cloud can be provided in a twofold way: it can be explicitly defined by attaching RDF types to the resources. Or it is provided implicitly via the definition of the resources´ properties.
In this paper, we analyze the correlation between the two sources of schema information. To this end, we have extracted schema information regarding the types and properties defined in two datasets of different size. One dataset is a LOD crawl from TimBL- FOAF profile (11 Mio. triple) and the second is an extract from the Billion Triples Challenge 2011 dataset (500 Mio. triple). We have conducted an in depth analysis and have computed various entropy measures as well as the mutual information encoded in this two manifestations of schema information.
Our analysis provides insights into the information encoded in the different schema characteristics. It shows that a schema based on either types or properties alone will capture only about 75% of the information contained in the data. From these observations, we derive conclusions about the design of future schemas for LOD.
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.
The Multimedia Metadata Ontology (M3O) provides a generic modeling framework for representing multimedia metadata. It has been designed based on an analysis of existing metadata standards and metadata formats. The M3O abstracts from the existing metadata standards and formats and provides generic modeling solutions for annotations, decompositions, and provenance of metadata. Being a generic modeling framework, the M3O aims at integrating the existing metadata standards and metadata formats rather than replacing them. This is in particular useful as today's multimedia applications often need to combine and use more than one existing metadata standard or metadata format at the same time. However, applying and specializing the abstract and powerful M3O modeling framework in concrete application domains and integrating it with existing metadata formats and metadata standards is not always straightforward. Thus, we have developed a step-by-step alignment method that describes how to integrate existing multimedia metadata standards and metadata formats with the M3O in order to use them in a concrete application. We demonstrate our alignment method by integrating seven different existing metadata standards and metadata formats with the M3O and describe the experiences made during the integration process.
Networked RDF graphs
(2007)
Networked graphs are defined in this paper as a small syntactic extension of named graphs in RDF. They allow for the definition of a graph by explicitly listing triples as well as by SPARQL queries on one or multiple other graphs. By this extension it becomes possible to define a graph including a view onto other graphs and to define the meaning of a set of graphs by the way they reference each other. The semantics of networked graphs is defined by their mapping into logic programs. The expressiveness and computational complexity of networked graphs, varying by the set of constraints imposed on the underlying SPARQL queries, is investigated. We demonstrate the capabilities of networked graphs by a simple use case.
Existing tools for generating application programming interfaces (APIs) for ontologies lack sophisticated support for mapping the logics-based concepts of the ontology to an appropriate object-oriented implementation of the API. Such a mapping has to overcome the fundamental differences between the semantics described in the ontology and the pragmatics, i.e., structure, functionalities, and behavior implemented in the API. Typically, concepts from the ontology are mapped one-to-one to classes in the targeted programming language. Such a mapping only produces concept representations but not an API at the desired level of granularity expected by an application developer. We present a Model-Driven Engineering (MDE) process to generate customized APIs for ontologies. This API generation is based on the semantics defined in the ontology but also leverages additional information the ontology provides. This can be the inheritance structure of the ontology concepts, the scope of relevance of an ontology concept, or design patterns defined in the ontology.
Modeling and publishing Linked Open Data (LOD) involves the choice of which vocabulary to use. This choice is far from trivial and poses a challenge to a Linked Data engineer. It covers the search for appropriate vocabulary terms, making decisions regarding the number of vocabularies to consider in the design process, as well as the way of selecting and combining vocabularies. Until today, there is no study that investigates the different strategies of reusing vocabularies for LOD modeling and publishing. In this paper, we present the results of a survey with 79 participants that examines the most preferred vocabulary reuse strategies of LOD modeling. Participants of our survey are LOD publishers and practitioners. Their task was to assess different vocabulary reuse strategies and explain their ranking decision. We found significant differences between the modeling strategies that range from reusing popular vocabularies, minimizing the number of vocabularies, and staying within one domain vocabulary. A very interesting insight is that the popularity in the meaning of how frequent a vocabulary is used in a data source is more important than how often individual classes and properties arernused in the LOD cloud. Overall, the results of this survey help in understanding the strategies how data engineers reuse vocabularies, and theyrnmay also be used to develop future vocabulary engineering tools.
Social networking platforms as creativity fostering systems: research model and exploratory study
(2008)
Social networking platforms are enabling users to create their own content, share this content with anyone they invite and organize connections with existing or new online contacts. Within these electronic environments users voluntarily add comments on virtual boards, distribute their search results or add information about their expertise areas to their social networking profiles and thereby share it with acquaintances, friends and increasingly even with colleagues in the corporate world. As a result, it is most likely that the underlying knowledge sharing processes result in many new and creative ideas. The objective of our research therefore is to understand if and how social social networking platforms can enforce creativity. In addition, we look at how these processes could be embedded within the organizational structures that influence innovative knowledge sharing behavior. The basis for our research is a framework which focuses on the relations between intrinsic motivation, creativity and social networking platforms. First results of our empirical investigation of a social software platform called "StudiVZ.net" proved that our two propositions are valid.