Thomas Franz

Thomas Franz
University of Applied Sciences Duesseldorf

Dr. rer. nat.

About

40
Publications
4,959
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752
Citations
Introduction
Software Engineering Methods and Practices Semantic Web Software Engineering Methods and Practices for AI Development

Publications

Publications (40)
Article
Full-text available
Events are central aspect of many semantic ambient media applications such as surveillance, smart homes, automobiles, and others. Existing models for events typically do not follow a systematic development approach, are conceptually narrow with respect to event features, and their semantics is often ambiguous. This makes the communication between a...
Article
This chapter presents the Core Ontology for Multimedia (COMM), which provides a formal semantics for multimedia annotations to enable interoperability of multimedia metadata among media tools. COMM maps the core functionalities of the MPEG-7 standard to a formal ontology, following an ontology design approach that utilizes the foundational Descript...
Article
Full-text available
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...
Chapter
The Social Web fosters novel applications targeting a more efficient and satisfying user guidance in modern social networks, e.g., for identifying thematically focused communities, or finding users with similar interests. Large scale and high diversity of users in social networks poses the challenging question of appropriate relevance/authority ran...
Article
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Zusammenfassung Populäre Ranking-Verfahren für das World Wide Web betrachten strukturelle Eigenschaften von Graphen für die Bewertung von Ressourcen, z.B. Webseiten. Diese Betrachtungsweise entspricht einer 2-dimensionalen Sicht in der Webseiten und deren Verknüpfungen modelliert sind. Wir stellen TripleRank vor, ein Verfahren, dass auf einer 3-dim...
Conference Paper
Full-text available
The Semantic Web fosters novel applications targeting a more effi- cient and satisfying exploitation of the data available on the web, e.g. faceted browsing of linked open data. Large amounts and high diversity of knowledge in the Semantic Web pose the challenging question of appropriate relevance ranking for producing fine-grained and rich descrip...
Conference Paper
Full-text available
When developing application programming interfaces of ontologies that include many instances of ontology design patterns, developers of semantic web applications usually have to handle complex mappings between descriptions of information given by ontologies and object oriented representations of the same information. In current approaches, annotati...
Conference Paper
Full-text available
The lack of a formal model of events hinders interoper- ability in distributed event-based systems. In this pa- per, we present a formal model of events, called Event- Model-F. The model is based on the foundational ontol- ogy DOLCE+DnS Ultralite (DUL) and provides com- prehensive support to represent time and space, objects and persons, as well as...
Conference Paper
Full-text available
Semantic desktop environments aim at improving the ef- fectiveness and efficiency of users carrying out daily tasks within their personal information management (PIM) infras- tructure. They support the user by transferring and exploit- ing the explicit semantics of data items across different PIM applications. Whether such an approach does indeed r...
Article
Full-text available
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 struct...
Conference Paper
Full-text available
We present an innovative approach for storing and processing extracted low-level image features based on current semantic Web technologies. We propose to use the COMM multimedia ontology as a "semantic" alternative to the MPEG-7 standard, which is at the same time largely compliant with it. We describe how COMM can be used directly or through its a...
Conference Paper
Full-text available
The business model of Web2.0 applications like FaceBook, Flickr, YouTube and their likes is based on an asymmetry: Users gen- erate content, Web2.0 application providers own, (i), the access to user content, (ii), the user profiles and, (iii), user interaction data. We argue in this paper that such asymmetry disadvantages the users and prevents inn...
Conference Paper
Full-text available
default, all platforms currently integrated into MyTag are then searched for the tags. The search results for each me- dia type are presented as separate results sets in different columns that can be sorted by popularity and creation date (cf. Fig. 2). For every resource in the result sets, its title, a preview, and the creation date are shown. For...
Conference Paper
Full-text available
In this poster, we present COSIFile and COSIMail, semantic desktop tools for enhanced le and email management that are based on the X-COSIM semantic desktop framework. They are implemented as extensions for an email client and le manager, specically designed to enhance support for
Conference Paper
Full-text available
We present LENA, a web-based RDF browser that sup- ports the rendering of complex RDF data, including in- terlinked data available on the Semantic Web, based on criteria expressed as SPARQL queries. The user interface of LENA enables to switch between dierent views onto the presented data enabling users to browse with respect to individual interest...
Chapter
Strategies for knowledge management as well as strategies for ITsystems supporting knowledge management have often been conceived to serve one particular knowledge management paradigm. We argue that in practice there is not one paradigm that suits all needs of all organizations. Considering knowledge management as a measure to further communication...
Chapter
Full-text available
The paradigm of a flexible environment that supports the user in producing, organizing, and browsing the knowledge originates in the early 1940s, a long time before the first personal computers and new communication tools like the Internet became available. The conceptual design of Vannevar Bush’s memex (Bush, 1945) (an acronym for Memory Extender)...
Article
Full-text available
Knowledge work is characterized by personal processes that describe complex tasks in which information is utilized in different contexts. The semantic desktop has been coined as a middleware that supports such work processes bet- ter than current desktops and associated applications: Today, implicit data models and proprietary data formats inhibit...
Chapter
The paradigm of a flexible environment that supports the user in producing, organizing, and browsing the knowledge originates in the early 1940s, a long time before the first personal computers and new communication tools like the Internet became available. The conceptual design of Vannevar Bush’s memex (Bush, 1945) (an acronym for Memory Extender)...
Conference Paper
Full-text available
In this paper, we present X-COSIM, a framework for cross context semantic information management con- sisting of the ontology X-COSIMO and the application programming interface X-COSIMA. X-COSIM provides what is lacking in current semantic desktops: A consis- tent seamless integration of a conceptually broad refer- ence model and context dependent...
Conference Paper
Full-text available
In large organizations the resources needed to solve chal- lenging problems are typically dispersed over systems within and beyond the organization, and also in dier- ent media. However, there is still the need, in knowl- edge environments, for extraction methods able to com- bine evidence for a fact from across dierent media. In many cases the who...
Chapter
Full-text available
1,ABSTRACT Web services are software components ,that are – in general – distributed over multiple organizations. They provide functionality without showing ,implementation ,details for the purpose of abstracting from implementation as well as for the purpose of hiding private, i.e. organization-internal, processes. Nevertheless, to use a web servi...
Conference Paper
Full-text available
Knowledge and information spanning multiple information sources, multiple media, multiple versions and multiple communities challenge the capabilities of existing knowledge and information man- agement infrastructures by far — primarily in terms of intellectually ex- ploiting the stored knowledge and information. In this paper we present some seman...
Article
Full-text available
With novel centralized information management systems, users benefit from collective data organization. Centraliza-tion, however, also imposes privacy and availability con-straints. With this work we present SEA, a semantic ex-change architecture for distributed information management that employs Peer-to-Peer networking, social information managem...
Article
Full-text available
This paper discusses design of a system to manage a supply network and its implementation in Web-based software. This design supports multiple supply networks, each of which may consist of a complex network of customer-supplier relationships. This project simulated production and shipping of products, allowing testing software in realistic situatio...
Article
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While instant messaging (IM) became a mature communi-cation means in business organizations over the last years, IM systems did not follow this evolution comparably. Communicated content is often stored insufficiently and hard to recall, integration into other desktop ap-plications impossible. In this paper, we address these shortcomings and provid...
Article
Full-text available
While instant messaging (IM) became a mature communica-tion means in business organizations over the last years, IM systems did not keep pace with this evolution. Communicated content is often stored insufficiently and hard to recall, integration into other desktop applica-tions impossible. In this paper, we demonstrate how to overcome these shortc...
Article
Browsing linked open data (LOD) is a promising, yet, often unsatisfactory experience today. User-support for the identi- fication of relevant information within the fast-growing cloud of LOD is limited. This paper presents LENATR, a browser for LOD that highlights relevant information with respect to different knowledge aspects hidden in linked dat...
Article
Full-text available
Semantic desktop environments aim at improving the effectiveness and efficiency of users carrying out daily tasks within their personal information management infrastructure (PIM). They support the user by transferring and exploiting the explicit semantics of data items across different PIM applications. Whether such an approach does indeed reach i...

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