8 Search Results for "Schaffert, Sebastian"

Document
DOI: 10.4230/TGDK.2.3.1
Unified Multimedia Segmentation - A Comprehensive Model for URI-based Media Segment Representation

Authors: Jan Willi, Abraham Bernstein, and Luca Rossetto

Published in: TGDK, Volume 2, Issue 3 (2024). Transactions on Graph Data and Knowledge, Volume 2, Issue 3

Abstract
In multimedia annotation, referencing specific segments of a document is often desired due to its richness and multimodality, but no universal representation for such references exists. This significantly hampers the usage of multimedia content in knowledge graphs, as it is modeled as one large atomic information container. Unstructured data - such as text, audio, images, and video - can commonly be decomposed into its constituent parts, as such documents rarely contain only one semantic concept. Hence, it is reasonable to assume that these advances will make it possible to decompose these previous atomic components into logical segments. To be processable by the knowledge graph stack, however, one needs to break the atomic nature of multimedia content, providing a mechanism to address media segments. This paper proposes a Unified Segmentation Model capable of depicting arbitrary segmentations on any media document type. The work begins with a formal analysis of multimedia and segmentation, exploring segmentation operations and how to describe them. Building on this analysis, it then develops a practical scheme for expressing segmentation in Uniform Resource Identifiers (URIs). Given that this approach makes segments of multimedia content referencable, it breaks their atomic nature and makes them first-class citizens within knowledge graphs. The proposed model is implemented as a proof of concept in the MediaGraph Store, a multimedia knowledge graph storage and querying engine.
Cite as

Jan Willi, Abraham Bernstein, and Luca Rossetto. Unified Multimedia Segmentation - A Comprehensive Model for URI-based Media Segment Representation. In Transactions on Graph Data and Knowledge (TGDK), Volume 2, Issue 3, pp. 1:1-1:34, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@Article{willi_et_al:TGDK.2.3.1,
  author =	{Willi, Jan and Bernstein, Abraham and Rossetto, Luca},
  title =	{{Unified Multimedia Segmentation - A Comprehensive Model for URI-based Media Segment Representation}},
  journal =	{Transactions on Graph Data and Knowledge},
  pages =	{1:1--1:34},
  ISSN =	{2942-7517},
  year =	{2024},
  volume =	{2},
  number =	{3},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/TGDK.2.3.1},
  URN =		{urn:nbn:de:0030-drops-225953},
  doi =		{10.4230/TGDK.2.3.1},
  annote =	{Keywords: Multimodal Knowledge Graphs, Multimedia Segmentation, Multimedia Representation}
}
Document
Survey
DOI: 10.4230/TGDK.2.1.3
Semantic Web: Past, Present, and Future

Authors: Ansgar Scherp, Gerd Groener, Petr Škoda, Katja Hose, and Maria-Esther Vidal

Published in: TGDK, Volume 2, Issue 1 (2024): Special Issue on Trends in Graph Data and Knowledge - Part 2. Transactions on Graph Data and Knowledge, Volume 2, Issue 1

Abstract
Ever since the vision was formulated, the Semantic Web has inspired many generations of innovations. Semantic technologies have been used to share vast amounts of information on the Web, enhance them with semantics to give them meaning, and enable inference and reasoning on them. Throughout the years, semantic technologies, and in particular knowledge graphs, have been used in search engines, data integration, enterprise settings, and machine learning. In this paper, we recap the classical concepts and foundations of the Semantic Web as well as modern and recent concepts and applications, building upon these foundations. The classical topics we cover include knowledge representation, creating and validating knowledge on the Web, reasoning and linking, and distributed querying. We enhance this classical view of the so-called "Semantic Web Layer Cake" with an update of recent concepts that include provenance, security and trust, as well as a discussion of practical impacts from industry-led contributions. We conclude with an outlook on the future directions of the Semantic Web. This is a living document. If you like to contribute, please contact the first author and visit: https://github.com/ascherp/semantic-web-primer
Cite as

Ansgar Scherp, Gerd Groener, Petr Škoda, Katja Hose, and Maria-Esther Vidal. Semantic Web: Past, Present, and Future. In Special Issue on Trends in Graph Data and Knowledge - Part 2. Transactions on Graph Data and Knowledge (TGDK), Volume 2, Issue 1, pp. 3:1-3:37, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@Article{scherp_et_al:TGDK.2.1.3,
  author =	{Scherp, Ansgar and Groener, Gerd and \v{S}koda, Petr and Hose, Katja and Vidal, Maria-Esther},
  title =	{{Semantic Web: Past, Present, and Future}},
  journal =	{Transactions on Graph Data and Knowledge},
  pages =	{3:1--3:37},
  ISSN =	{2942-7517},
  year =	{2024},
  volume =	{2},
  number =	{1},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/TGDK.2.1.3},
  URN =		{urn:nbn:de:0030-drops-198607},
  doi =		{10.4230/TGDK.2.1.3},
  annote =	{Keywords: Linked Open Data, Semantic Web Graphs, Knowledge Graphs}
}
Document
Invited Talk
DOI: 10.4230/LIPIcs.ICLP.2012.1
Simulation Unification: Beyond Querying Semistructured Data (Invited Talk)

Authors: François Bry and Sebastian Schaffert

Published in: LIPIcs, Volume 17, Technical Communications of the 28th International Conference on Logic Programming (ICLP'12) (2012)

Abstract
This article first reminds of simulation unification, a non-standard unification proposed at the 18th International Conference on Logic Programming (ICLP 2002) for making logic programming capable of querying semistructured data on the Web. This article further argues that, beyond querying semistructured data on the Web, simulation unification has a potential for Web querying of multimedia data and semantic metadata and for Web searching of data of all kinds.
Cite as

François Bry and Sebastian Schaffert. Simulation Unification: Beyond Querying Semistructured Data (Invited Talk). In Technical Communications of the 28th International Conference on Logic Programming (ICLP'12). Leibniz International Proceedings in Informatics (LIPIcs), Volume 17, pp. 1-13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@InProceedings{bry_et_al:LIPIcs.ICLP.2012.1,
  author =	{Bry, Fran\c{c}ois and Schaffert, Sebastian},
  title =	{{Simulation Unification: Beyond Querying Semistructured Data}},
  booktitle =	{Technical Communications of the 28th International Conference on Logic Programming (ICLP'12)},
  pages =	{1--13},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-43-9},
  ISSN =	{1868-8969},
  year =	{2012},
  volume =	{17},
  editor =	{Dovier, Agostino and Santos Costa, V{\'\i}tor},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICLP.2012.1},
  URN =		{urn:nbn:de:0030-drops-36060},
  doi =		{10.4230/LIPIcs.ICLP.2012.1},
  annote =	{Keywords: Simulation Unification, (Semantic) Web Querying}
}
Document
DOI: 10.4230/DagSemProc.10041.1
10041 Abstracts Collection – Perspectives Workshop: Digital Social Networks

Authors: Francois Bry, Clemens Cap, Ingo Dahm, Julia Maintz, and Sebastian Schaffert

Published in: Dagstuhl Seminar Proceedings, Volume 10041, Perspectives Workshop: Digital Social Networks (2010)

Abstract
From 24.01.2010 to 29.01.2010, the Dagstuhl Seminar 10041 ``Perspectives Workshop: Digital Social Networks'' was held in Schloss Dagstuhl ~--~ Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available.
Cite as

Francois Bry, Clemens Cap, Ingo Dahm, Julia Maintz, and Sebastian Schaffert. 10041 Abstracts Collection – Perspectives Workshop: Digital Social Networks. In Perspectives Workshop: Digital Social Networks. Dagstuhl Seminar Proceedings, Volume 10041, pp. 1-10, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{bry_et_al:DagSemProc.10041.1,
  author =	{Bry, Francois and Cap, Clemens and Dahm, Ingo and Maintz, Julia and Schaffert, Sebastian},
  title =	{{10041 Abstracts Collection – Perspectives Workshop: Digital Social Networks}},
  booktitle =	{Perspectives Workshop: Digital Social Networks},
  pages =	{1--10},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{10041},
  editor =	{Francois Bry and Clemens Cap and Ingo Dahm and Julia Maintz and Sebastian Schaffert},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.10041.1},
  URN =		{urn:nbn:de:0030-drops-25214},
  doi =		{10.4230/DagSemProc.10041.1},
  annote =	{Keywords: Digital Social Media, Social Software, Social Computing}
}
Document
DOI: 10.4230/DagSemProc.10041.3
10041 Manifesto – Perspectives Workshop: Digital Social Media

Authors: Francois Bry, Clemens Cap, Ingo Dahm, Julia Maintz, and Sebastian Schaffert

Published in: Dagstuhl Seminar Proceedings, Volume 10041, Perspectives Workshop: Digital Social Networks (2010)

Abstract
This manifesto explains and stresses the importance of “digital social media”, "social software" and "social computing". In particular, it makes the claim that we need a better understanding of how this mix of enabling technology, social behaviour and market practises is challenging our socio-economical and political systems, and puts forward an action plan for the areas of education, fundamental research and applied research, to address these challenges. The goal of this manifesto is to raise awareness for digital social media and to stress the need for research, research funding, and education in a field so far under-represented in public research funding programmes and in education. This manifesto does not cover all aspects of digital social media, or provide a comprehensive treatment of their socio-economical impact. Such issues are beyond the scope of this manifesto. This manifesto is an outcome of a Perspective Workshop held from the 25th to 29th of January 2010 at the research centre Schloss Dagstuhl. The workshop brought together scientists and practitioners from academia and industry, across the fields of social sciences and computer science.
Cite as

Francois Bry, Clemens Cap, Ingo Dahm, Julia Maintz, and Sebastian Schaffert. 10041 Manifesto – Perspectives Workshop: Digital Social Media. In Perspectives Workshop: Digital Social Networks. Dagstuhl Seminar Proceedings, Volume 10041, pp. 1-13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{bry_et_al:DagSemProc.10041.3,
  author =	{Bry, Francois and Cap, Clemens and Dahm, Ingo and Maintz, Julia and Schaffert, Sebastian},
  title =	{{10041 Manifesto – Perspectives Workshop: Digital Social Media}},
  booktitle =	{Perspectives Workshop: Digital Social Networks},
  pages =	{1--13},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{10041},
  editor =	{Francois Bry and Clemens Cap and Ingo Dahm and Julia Maintz and Sebastian Schaffert},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.10041.3},
  URN =		{urn:nbn:de:0030-drops-25652},
  doi =		{10.4230/DagSemProc.10041.3},
  annote =	{Keywords: Digital Social Media, Social Software, Social Computing}
}
Document
DOI: 10.4230/DagSemProc.10041.2
10041 Executive Summary – Perspectives Workshop: Digital Social Networks

Authors: Francois Bry, Clemens Cap, Ingo Dahm, Julia Maintz, and Sebastian Schaffert

Published in: Dagstuhl Seminar Proceedings, Volume 10041, Perspectives Workshop: Digital Social Networks (2010)

Abstract
The Perspective Workshop on “Digital Social Networks” held in between January 25th and 29th, 2010 at the research centre Schloss Dagstuhl focused on technological, socio-economical, and political aspects of digital social networks, and, more generally, digital social media. Digital social media give rise to users and communities to collaboratively generate and exchange content and to interact. They enable social computation, i.e. computations that involve both software and groups of people. They are operated by specific software systems called social software and use information and communication technologies such as the Internet and Web technologies. Digital social media ease and strengthen social interactions by overcoming physical limitations in communication (like distance and synchronicity) and alleviating human limitations like the number of people with whom one can maintain relationships. Digital social media build, and/or rely upon, social networks that might be the primary purpose of the media.
Cite as

Francois Bry, Clemens Cap, Ingo Dahm, Julia Maintz, and Sebastian Schaffert. 10041 Executive Summary – Perspectives Workshop: Digital Social Networks. In Perspectives Workshop: Digital Social Networks. Dagstuhl Seminar Proceedings, Volume 10041, pp. 1-2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{bry_et_al:DagSemProc.10041.2,
  author =	{Bry, Francois and Cap, Clemens and Dahm, Ingo and Maintz, Julia and Schaffert, Sebastian},
  title =	{{10041 Executive Summary – Perspectives Workshop: Digital Social Networks}},
  booktitle =	{Perspectives Workshop: Digital Social Networks},
  pages =	{1--2},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{10041},
  editor =	{Francois Bry and Clemens Cap and Ingo Dahm and Julia Maintz and Sebastian Schaffert},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.10041.2},
  URN =		{urn:nbn:de:0030-drops-25480},
  doi =		{10.4230/DagSemProc.10041.2},
  annote =	{Keywords: Digital Social Media, Social Software, Social Computing}
}
Document
DOI: 10.4230/DagSemProc.10041.4
Gaming as social activity

Authors: Carsten Busch

Published in: Dagstuhl Seminar Proceedings, Volume 10041, Perspectives Workshop: Digital Social Networks (2010)

Abstract
Gaming – no matter, wether it's done analog or digital – is a social kind of acitivity. The GamesLab of HTW in Berlin has made an investigation about Gaming in Germany. Some of the results of an representetive survey are: Only 2 % of all Germans don't like to play analog or digital games; 95 % play at least occasionally board games, 43 % play at least occasionally video games or computer games; 74 % like "playing together with others, because it's communicative and interessing".
Cite as

Carsten Busch. Gaming as social activity. In Perspectives Workshop: Digital Social Networks. Dagstuhl Seminar Proceedings, Volume 10041, pp. 1-18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{busch:DagSemProc.10041.4,
  author =	{Busch, Carsten},
  title =	{{Gaming as social activity}},
  booktitle =	{Perspectives Workshop: Digital Social Networks},
  pages =	{1--18},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{10041},
  editor =	{Francois Bry and Clemens Cap and Ingo Dahm and Julia Maintz and Sebastian Schaffert},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.10041.4},
  URN =		{urn:nbn:de:0030-drops-25205},
  doi =		{10.4230/DagSemProc.10041.4},
  annote =	{Keywords: Games}
}
Document
DOI: 10.4230/DagSemProc.10041.5
On the locality of virtual networks: Informal learning in the San Francisco Bay Area

Authors: Julia Maintz

Published in: Dagstuhl Seminar Proceedings, Volume 10041, Perspectives Workshop: Digital Social Networks (2010)

Abstract
Since the 1990s, informal and personal networks have gained increasing attention as repositories of learning and innovation. Social network analyses so far largely concentrate on the impact of network structures on innovation processes. The role of social network dynamics and the interrelation of structure and agency in these processes however need to be more intensively analyzed. This research concentrates on learning dynamics in personal online business networks of communication and computing industry professionals based in the San Francisco Bay Area. The technological potential for online global multi-connectivity of the studied LinkedIn networks showed limited realization due to the users’ stickiness to their physical practice communities and localities. Physical social interaction served as the prime motor of network formation and maintenance.
Cite as

Julia Maintz. On the locality of virtual networks: Informal learning in the San Francisco Bay Area. In Perspectives Workshop: Digital Social Networks. Dagstuhl Seminar Proceedings, Volume 10041, pp. 1-21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{maintz:DagSemProc.10041.5,
  author =	{Maintz, Julia},
  title =	{{On the locality of virtual networks: Informal learning in the San Francisco Bay Area}},
  booktitle =	{Perspectives Workshop: Digital Social Networks},
  pages =	{1--21},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{10041},
  editor =	{Francois Bry and Clemens Cap and Ingo Dahm and Julia Maintz and Sebastian Schaffert},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.10041.5},
  URN =		{urn:nbn:de:0030-drops-25199},
  doi =		{10.4230/DagSemProc.10041.5},
  annote =	{Keywords: Innovation, personal online networks, physical space, qualitative social network analysis}
}
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