Rudi Studer

Rudi Studer
FZI Forschungszentrum Informatik | FZI

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325
Publications
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16,110
Citations

Publications

Publications (325)
Article
The proximity between newspapers and political parties is strongly subjective and difficult to measure. Yet, political tendencies of newspapers can have a significant impact on voters’ opinion-forming and ought to be known by the public in a transparent and timely manner. This article introduces the Sentiment Political Compass (SPC), a data-driven...
Article
Many current web pages include structured data which can directly be processed and used. Search engines, in particular, gather that structured data and provide question answering capabilities over the integrated data with an entity-centric presentation of the results. Due to the decentralized nature of the web, multiple structured data sources can...
Preprint
Full-text available
The past few years have been marked by an increased use of sensor technologies, abundant availability of mobile devices, and growing popularity of wearables, which enable the direct integration of their data as part of rich client applications. Despite the potential and added value that such aggregate applications bring, the implementations are usu...
Conference Paper
It is our great pleasure to welcome you to the first edition of WWW 2018 Journal Track. The track is new track within WWW conference series and it is intended as a forum for presentations of significant Web-related research results that have been published recently in well-known and established journals, and have never been presented at any Web-rel...
Conference Paper
A lot of current web pages include structured data which can directly be processed and used. Search engines, in particular, gather that structured data and provide question answering capabilities over the integrated data with an entity-centric presentation of the results. Due to the decentralized nature of the web, multiple structured data sources...
Chapter
Full-text available
Erratum to: M. Musen et al. (Eds.) Intelligent Information Processing DOI: 10.1007/978-0-387-35602-0
Conference Paper
For cardiac surgeons, mitral valve reconstruction (MVR) surgery is a highly demanding procedure, where an artificial annuloplasty ring is implanted onto the mitral valve annulus to re-enable the valve's proper closing functionality. For a successful operation the surgeon has to keep track of a variety of relevant impact factors, such as patient-ind...
Article
Full-text available
The past few years have been marked by an increased use of sensor technologies, abundant availability of mobile devices, and growing popularity of wearables, which enable the direct integration of their data as part of rich client applications. Despite the potential and added value that such aggregate applications bring, the implementations are usu...
Conference Paper
Purpose: Assistance algorithms for medical tasks have great potential to support physicians with their daily work. However, medicine is also one of the most demanding domains for computer-based support systems, since medical assistance tasks are complex and the practical experience of the physician is crucial. Recent developments in the area of co...
Article
Full-text available
Malignant neoplasms of the liver are among the most frequent cancers worldwide. Given the diversity of options for liver cancer therapy, the choice of treatment depends on various parameters including patient condition, tumor size and location, liver function, and previous interventions. To address this issue, we present the first approach to treat...
Article
Full-text available
In the last years, a large number of RDF data sets has become available on the Web. However, due to the semi-structured nature of RDF data, missing values affect answer completeness of queries that are posed against this data. To overcome this limitation, we propose RDF-Hunter, a novel hybrid query processing approach that brings together machine a...
Conference Paper
Many RDF descriptions today are text-rich: besides structured data they also feature much unstructured text. Text-rich RDF data is frequently queried via predicates matching structured data, combined with string predicates for textual constraints (hybrid queries). Evaluating hybrid queries efficiently requires means for selectivity estimation. Prev...
Article
With the Internet becoming part of everyday life, technologies enriching available data and software services with metadata gain importance. These semantic technologies for modeling knowledge bases and managing them have already started to be applied in the World Wide Web and in enterprises for some years. But, up to now, semantic technologies are...
Patent
Full-text available
A mechanism is provided for evaluating a service based on a request for the service. At least one attribute, having at least one preference parameter, is assigned to at least one generic configuration, the at least one generic configuration comprising at least one resource. A request is received for the service having an assigned quality-of-service...
Conference Paper
Text-rich structured data become more and more ubiquitous on the Web and on the enterprise databases by encoding heterogeneous structural information between entities such as people, locations, or organizations and the associated textual information. For analyzing this type of data, existing topic modeling approaches, which are highly tailored towa...
Conference Paper
In order to successfully give a lecture or do a presentation in a conference, presenters need certain skills as well as previous preparation. In such scenarios, reflective learning offers a great potential to improve professional skills and presenter’s performance by relying on data captured during the presentation. For this purpose, we developed t...
Conference Paper
An increasing amount of applications build their functionality on the utilisation and manipulation of web resources. Consequently REST gains popularity with a resource-centric interaction architecture that draws its flexibility from links between resources. Linked Data offers a uniform data model for REST with self-descriptive resources that can be...
Conference Paper
The relevance of many types of data perishes or degrades over time; to support timely decision-making, data integration systems must provide access to live data and should make it easy to incorporate new sources. We outline methods, based on web architecture that enable (near) real-time access to data sources in a variety of formats and access moda...
Article
This report documents the program and the outcomes of Dagstuhl Seminar 12171 "Semantic Data Management". The purpose of the seminar was to have a fruitful exchange of ideas between the semantic web, database systems and information retrieval communities, organised across four main themes: scalability, provenance, dynamicity and search. Relevant key...
Conference Paper
In the Web there are a large number of (business) services with complex behavior, such as e-commerce Web sites that require multiple interactions with the user, as well as an increasing number of Web automation scripts to coordinate the execution of multiple complex services. However, while there are a quite a few search techniques for atomic Web s...
Conference Paper
In recent years, top-k query processing has attracted much attention in large-scale scenarios, where computing only the k "best" results is often sufficient. One line of research targets the so-called top-k join problem, where the k best final results are obtained through joining partial results. In this paper, we study the top-k join problem in a...
Article
Full-text available
Access to XML-based documents currently relies on query languages that are closely tied to the document structures, i.e. when looking for information one has to be aware of this structure and cannot easily specify the information needs conceptually. Our approach uses ontologies to access sets of distributed XML documents on a conceptual level. We i...
Conference Paper
Wikipedia provides an interesting amount of text for more than hundred languages. This also includes languages where no reference corpora or other linguistic resources are easily available. We have extracted background language models built from the content of Wikipedia in various languages. The models generated from Simple and English Wikipedia ar...
Conference Paper
In this paper we present a novel approach for achieving energy efficiency in public buildings (especially sensor-enabled offices) based on the application of intelligent complex event processing and semantic technologies. In the nutshell of the approach is an efficient method for realizing the real-time situational awareness that helps in recognizi...
Chapter
Complex Event Processing (CEP) is concerned with timely detection of complex events within multiple streams of atomic occurrences, and has useful applications in areas including financial services, mobile and sensor devices, click stream analysis and so forth. In this chapter, we present ETALIS Language for Events. It is an expressive language for...
Conference Paper
Full-text available
In this paper we present a use case related to the intelligent processing of events coming from the conventional ("cheap") sensors in order to support better energy consumption in commercial buildings. The approach has been implemented using our iCEP framework and deployed in the office space of a real working environment. This research is a kind o...
Chapter
Ontologies have become a prominent topic in Computer Science where they serve as explicit conceptual knowledge models that make domain knowledge available to information systems. They play a key role in the vision of the Semantic Web where they provide the semantic vocabulary used to annotate websites in a way meaningful for machine interpretation....
Chapter
This volume has introduced the foundations and technologies which make up the Semantic Web. Mostly the discussion has been on the state of the art, but what developments can be expected next in semantic technologies? What social and technological trends will spur and enable the next generation of semantic technology? Which application areas can one...
Conference Paper
Formal policies allow the non-ambiguous definition of situations in which usage of certain entities are allowed, and enable the automatic evaluation whether a situation is compliant. This is useful for example in applications using data provided via standardized interfaces. The low technical barriers of integrating such data sources is in contrast...
Conference Paper
Full-text available
Service orientation is a promising paradigm for offering and consuming functionalities within and across organizations. Ever increasing acceptance of service oriented architectures in combination with the acceptance of the Web as a platform for carrying out electronic business triggers a need for automated methods to find appropriate Web services....
Conference Paper
The availability of contents and information as linked data or Web services, i.e. over standardized interfaces, fosters the integration and reuse of data. One common form of information integration is the creation of composed documents, e.g. in form of dynamic Web pages. Service and data providers restrict allowed usage of their resources and and l...
Conference Paper
Full-text available
The proliferation of linked data on the Web paves the way to a new generation of applications that exploit heterogeneous data from different sources. However, because this Web of data is large and continuously evolving, it is non-trivial to identify the relevant link data sources and to express some given information needs as structured queries ag...
Article
The research program �Information Management and Market Engineering� focuses on the analysis and the design of electronic markets. Taking a holistic view of the conceptualization and realization of solutions, the research integrates the disciplines business administration, economics, computer science, and law. Topics of interest range from the impl...
Chapter
Full-text available
In this chapter we present a methodology for introducing and maintaining ontology based knowledge management applications into enterprises with a focus on Knowledge Processes and Knowledge Meta Processes. While the former process circles around the usage of ontologies, the latter process guides their initial set up.We illustrate our methodology by...
Conference Paper
Ontologies are used to formally describe domains of interest. As domains change over time, the ontologies have to be updated accordingly. We advocate the introduction of an Ontology Update Language that captures frequent domain changes and hence facilitates regular updates to be made in ontologies. We thoroughly discuss the general design choices f...
Article
In service-oriented architectures, applications are developed by incorporating services which are often provided by different organizations. Since a service might be offered under different configurations by various different organizations, sophisticated service selection and negotiation algorithms are required. Policies capture the conditions unde...
Conference Paper
This column examines connections between the subjectivity of time, consciousness, and artificial intelligence.
Conference Paper
Full-text available
The Web as a global information space is developing from a Web of documents to a Web of data. This development opens new ways for addressing complex information needs. Search is no longer limited to matching keywords against documents, but instead complex information needs can be expressed in a structured way, with precise answers as results. In th...
Article
Full-text available
Ontologies are considered a key technology enabling semantic interoperability and integration of data and processes. We are now entering a phase of knowledge system development, in which ontologies are produced in larger numbers and exhibit greater complexity than before. Ontology management infrastructures are needed for the increasing development...
Article
In recent years, electronic markets have gained much attention as institutions to allocate goods and services effi ciently between buyers and sellers. By leveraging the Web as a global communication medium, electronic markets provide a platform that allows par- ticipants throughout the world to spontaneously exchange products in a flexible manner....
Article
A central research topic in the area of knowledge engineering is the reuse of problem-solving methods for developing knowledge based systems. For being able to reuse a problem-solving method it is important to know under which restrictions a problem-solving method is appropriate to solve a given problem. This paper describes the problem-solving met...
Article
The customization of a natural language interface to a certain application, domain or knowledge base still represents a major effort for end users given the current state-of-the-art. In this article, we present our natural language interface ORAKEL, describe its architecture, design choices and implementation. In particular, we present ORAKEL’s ada...
Chapter
Due to its long and rich background in product engineering, continental Europe and Germany especially can emerge as a strong force in service engineering. In particular, because much of the methods toolkit currently applied in service design and engineering builds upon traditional engineering methods. SSME only will be successful in the future if b...
Article
SERVICES SCIENCE AND ENGINEERING While the Anglo-Saxon countries are known for their well-developed services sector, continental Europe has traditionally focussed on designing and developing top-quality industrial products. However, there is reason to believe that Europe, especially Germany, can emerge as a strong force in the area of service engin...
Chapter
Computergraphik hat sich als Basistechnologie bei der Gestaltung von Mensch- Maschine-Schnittstellen etabliert. Während die neunziger Jahre noch durch die Entwicklung immersiver Ein- und Ausgabegeräte geprägt waren („Virtuelle Realität“), verschmilzt in der „Augmented-Reality“ Computergraphik mit Technologien aus den Bereichen „Mobile Computing“ un...
Article
The DILIGENT argumentation framework helps to capture the design deliberations in ontology-engineering and it makes the consensus building task more efficient and provide detailed guidance for the non experts. The argumentation framework provides the detailed ontology-engineering approach that is clearly supporting direct interaction between ontolo...
Article
Full-text available
Wikipedia is the world's largest collaboratively edited source of encyclopaedic knowledge. But in spite of its utility, its content is barely machine-interpretable and only weakly structured. With Semantic MediaWiki we provide an extension that enables wiki-users to semantically annotate wiki pages, based on which the wiki contents can be browsed,...
Article
The tremendous success of the World Wide Web is countervailed by efforts needed to search and find relevant information. For tabular structures embedded in HTML documents, typical keyword or link-analysis based search fails. The Semantic Web relies on annotating resources such as documents by means of ontologies and aims to overcome the bottleneck...
Conference Paper
A key challenge for dynamic Web service selection is that Web ser- vices are typically highly configurable and service requesters often have dynamic preferences on service configurations. Current ap- proaches, such as WS-Agreement, describe Web services by enu- merating the various possible service configurations, an inefficient approach when deali...
Conference Paper
Full-text available
Current information retrieval (IR) approaches do not formally capture the explicit meaning of a keyword query but provide a comfortable way for the user to specify information needs on the basis of keywords. Ontology-based ap- proaches allow for sophisticated semantic search but impose a query syntax more di cult to handle. In this paper, we presen...
Conference Paper
Full-text available
Ontology-based applications play an increasingly important role in the public and corporate Semantic Web. While today there exist a range of tools and technologies to support specific ontology engineering and management activities, architectural design guidelines for building ontology-based applications are missing. In this paper, we present an arc...
Article
Full-text available
The development of the Semantic Web is still in its early phase when compared to the success story of the World Wide Web during the last decade. On the one hand, this is due to the fact that some of the underlying technologies, like e.g. the web ontology language OWL (cf. http://www.w3.org/2001/sw/WebOnt/), are just being defined and therefore not...
Book
In just a few years, service-oriented architectures (SOA) and Web services not only gained considerable interest in computer science research, they were also taken up with unanimity by all major international players in the IT industry. However, and in spite of all existing standards, in most SOA applications much human intervention is still requir...
Chapter
Since Web Services are complex artefacts that rely on sophisticated protocols and data formats, it is important to have effective strategies for dealing with this complexity. As a basic concept, the Web Service technologies are structured in a stack model. It is crucial for every Web Service developer to have this model in mind and to have a clear...
Chapter
Web Services expose machine-processable interfaces that provide flexible access to their functionality in network environments for realising application integration scenarios. As any other web resource, it is desirable to locate and get access to Web Services by specifying relevant properties in the form of a request, similar to how websites are lo...
Chapter
This chapter is meant as a motivation of why and how Web Services have evolved. Starting from the increasing need for integration of IT solutions, we argue that Web Services have something to offer, especially for the important fields of Business-to-Business (B2B) and Enterprise Application Integration (EAI). However, this is only the beginning of...
Conference Paper
The notion of the Semantic Web can be coined as a Web of data when bringing database content to the Web or as a Web of enriched human-readable content when encoding the semantics of web-resources in a machine-interpretable form. It has been clear from the beginning that realizing the Semantic Web vision will require interdisciplinary research. At...
Article
Ontologies are nowadays used for many applications requiring data, services and resources in general to be interoperable and machine understandable. Such applications are for example web service discovery and composition, information integration across databases, intelligent search, etc. The general idea is that data and services are semantically d...
Conference Paper
Wikipedia is the world's largest collaboratively edited source of encyclopaedic knowledge. But its contents are barely machine-interpretable. Structural knowledge, e. g. about how concepts are interrelated, can neither be formally stated nor automatically processed. Also the wealth of numerical data is only available as plain text and thus can not...
Article
In our modern information society, people need to manage ever-increasing numbers of personal devices and conduct more of their work and activities online, often using heterogeneous services. The amount of information each individual has to process is constantly growing, making this information increasingly difficult to control, channel, share, and...
Chapter
Management of Networked OntologiesEngineering of Networked OntologiesContextualizing OntologiesCross Media ResourcesSocial Semantic DesktopApplications
Conference Paper
Full-text available
In this paper we present a MOF compliant metamodel and UML profile for the Semantic Web Rule Language (SWRL) that inte- grates with our previous work on a metamodel and UML profile for OWL DL. Based on this metamodel and profile, UML tools can be used for visual modeling of rule-extended ontologies.
Chapter
The Semantic Web combines the descriptive languages RDF (Resource Description Framework) and OWL (Web Ontology Language), with the data-centric, customizable XML (eXtensible Mark-up Language) to provide descriptions of the content of Web documents. These machine-interpretable descriptions allow more intelligent software systems to be written, autom...
Chapter
LLILOG is the knowledge representation language that is used in the LILOG project, a research project in the area of natural language understanding. LLILOG is based on full first order predicate logic and incorporates a powerful sort mechanism. Besides having a set of sorts together with an order relation on them sorts may also be defined by attrib...
Chapter
In order to reduce the complexity of large knowledge-based systems and promote reusability, means for decomposing them to smaller chunks are required. MIKE, our knowledge engineering framework, provides three basic means for structuring which are described in this paper: different kinds of knowledge are separated at different knowledge layers, know...
Conference Paper
Full-text available
This paper presents a method for semantically aligning business processes. We provide a representation of Petri nets in the ontology language OWL, to semantically enrich the business process models. On top of this, we propose a technique for semantically aligning business processes to support (semi)automatic inter- connectivity of business processe...
Conference Paper
In recent years, electronic markets have gained much atten- tion as institutions to allocate goods and services efficiently between buyers and sellers. However, calculating suitable allocations between buyers and sellers in such markets can easily become very tricky, particularly if the services and goods involved are complex and described by multi...
Chapter
In der Informatik sind Ontologien formale Modelle eines Anwendungsbereiches, die die Kommunikation zwischen menschlichen und/oder maschinellen Akteuren unterstützen und damit den Austausch und das Teilen von Wissen in Unternehmen erleichtern. Ontologien zur strukturierten Darstellung von Wissen zu nutzen hat deshalb in den letzten Jahren zunehmende...
Article
Full-text available
Next generation semantic applications will be characterized by a large number of networked ontologies; as a consequence the com-plexity of semantic applications increases. In this paper we present a metamodel and a UML syntax for the specification of networked ontolo-gies. For the specification of the metamodel, we follow the metamodeling approach...
Article
In der Informatik sind Ontologien formale Modelle eines Anwendungsbe-reiches, die die Kommunikation zwischen menschlichen und/oder maschinellen Ak-teuren unterstützen und damit den Austausch und das Teilen von Wissen in Unterneh-men erleichtern. Ontologien zur strukturierten Darstellung von Wissen zu nutzen hat deshalb in den letzten Jahren zunehme...
Article
We present our work in integrating Semantic Web services for access via mobile devices. We have developed a system, the WebServiceAccessComponent, that transforms a user re-quest for a service on a mobile device, to a Web service re-quest and then selects a matching service from the existing Web services of the Deutsche Telekom, which provide navi-...