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Documents authored by Jensen, Christian S.

Document
Invited Paper
DOI: 10.4230/LIPIcs.TIME.2018.2
Database Technology for Processing Temporal Data (Invited Paper)

Authors: Michael H. Böhlen, Anton Dignös, Johann Gamper, and Christian S. Jensen

Published in: LIPIcs, Volume 120, 25th International Symposium on Temporal Representation and Reasoning (TIME 2018)

Abstract
Despite the ubiquity of temporal data and considerable research on processing such data, database systems largely remain designed for processing the current state of some modeled reality. More recently, we have seen an increasing interest in processing historical or temporal data. The SQL:2011 standard introduced some temporal features, and commercial database management systems have started to offer temporal functionalities in a step-by-step manner. There has also been a proposal for a more fundamental and comprehensive solution for sequenced temporal queries, which allows a tight integration into relational database systems, thereby taking advantage of existing query optimization and evaluation technologies. New challenges for processing temporal data arise with multiple dimensions of time and the increasing amounts of data, including time series data that represent a special kind of temporal data.
Cite as

Michael H. Böhlen, Anton Dignös, Johann Gamper, and Christian S. Jensen. Database Technology for Processing Temporal Data (Invited Paper). In 25th International Symposium on Temporal Representation and Reasoning (TIME 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 120, pp. 2:1-2:7, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{bohlen_et_al:LIPIcs.TIME.2018.2,
  author =	{B\"{o}hlen, Michael H. and Dign\"{o}s, Anton and Gamper, Johann and Jensen, Christian S.},
  title =	{{Database Technology for Processing Temporal Data}},
  booktitle =	{25th International Symposium on Temporal Representation and Reasoning (TIME 2018)},
  pages =	{2:1--2:7},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-089-7},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{120},
  editor =	{Alechina, Natasha and N{\o}rv\r{a}g, Kjetil and Penczek, Wojciech},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TIME.2018.2},
  URN =		{urn:nbn:de:0030-drops-97674},
  doi =		{10.4230/LIPIcs.TIME.2018.2},
  annote =	{Keywords: Temporal databases, temporal query processing, sequenced semantics, SQL}
}
Document
DOI: 10.4230/DagSemProc.05421.1
05421 Abstracts Collection – Data Always and Everywhere – Management of Mobile, Ubiquitous, Pervasive, and Sensor Data

Authors: Gustavo Alonso, Christian S. Jensen, and Bernhard Mitschang

Published in: Dagstuhl Seminar Proceedings, Volume 5421, Data Always and Everywhere - Management of Mobile, Ubiquitous, Pervasive, and Sensor Data (2006)

Abstract
From 16.10.05 to 21.10.05, the Dagstuhl Seminar 05421, Data Always and Everywhere - Management of Mobile, Ubiquitous, Pervasive, and Sensor Data, was held in the International Conference and Research Center, Schloss Dagstuhl. During the seminar, all participants were given the opportunity to present their current research, and ongoing activities and open problems were discussed. This document is a collection of the abstracts of the presentations given during the seminar. Some abstracts offer links to extended abstracts, full papers, and other supporting documents. A separate companion document summarizes the seminar. The authors wish to acknowledge Victor Teixeira de Almeida, who served as collector for the seminar and thus played a key role in collecting materials from the seminar participants.
Cite as

Gustavo Alonso, Christian S. Jensen, and Bernhard Mitschang. 05421 Abstracts Collection – Data Always and Everywhere – Management of Mobile, Ubiquitous, Pervasive, and Sensor Data. In Data Always and Everywhere - Management of Mobile, Ubiquitous, Pervasive, and Sensor Data. Dagstuhl Seminar Proceedings, Volume 5421, pp. 1-19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{alonso_et_al:DagSemProc.05421.1,
  author =	{Alonso, Gustavo and Jensen, Christian S. and Mitschang, Bernhard},
  title =	{{05421 Abstracts Collection – Data Always and Everywhere – Management of Mobile, Ubiquitous, Pervasive, and Sensor Data}},
  booktitle =	{Data Always and Everywhere - Management of Mobile, Ubiquitous, Pervasive, and Sensor Data},
  pages =	{1--19},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5421},
  editor =	{Gustavo Alonso and Christian S. Jensen and Bernhard Mitschang},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05421.1},
  URN =		{urn:nbn:de:0030-drops-7966},
  doi =		{10.4230/DagSemProc.05421.1},
  annote =	{Keywords: Mobile ubiquitous and pervasive computing, sensor data, data streams, content integration, replication, caching, and consistency, service orientation, query and update processing, indexing, tracking process models, peer-to-peer computing, mobile ad-hoc networking, context awareness and preferences, moving objects, location--based mobile services,}
}
Document
DOI: 10.4230/DagSemProc.05421.2
05421 Executive Summary – Data Always and Everywhere – Management of Mobile, Ubiquitous, and Pervasive Data

Authors: Gustavo Alonso, Christian S. Jensen, and Bernhard Mitschang

Published in: Dagstuhl Seminar Proceedings, Volume 5421, Data Always and Everywhere - Management of Mobile, Ubiquitous, Pervasive, and Sensor Data (2006)

Abstract
This report summarizes the important aspects of the workshop on "Management of Mobile, Ubiquitous, and Pervasive Data", which took place from October 16th to October 21st, 2005. Thirty-seven participants from thirteen countries met during that week and discussed a broad range of topics related to the management of data in relation to mobile, ubiquitous, and pervasive applications of information technology. The wealth of the contributions is available at the seminar page at the Dagstuhl server. Here, we provide a short overview.
Cite as

Gustavo Alonso, Christian S. Jensen, and Bernhard Mitschang. 05421 Executive Summary – Data Always and Everywhere – Management of Mobile, Ubiquitous, and Pervasive Data. In Data Always and Everywhere - Management of Mobile, Ubiquitous, Pervasive, and Sensor Data. Dagstuhl Seminar Proceedings, Volume 5421, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2006)

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@InProceedings{alonso_et_al:DagSemProc.05421.2,
  author =	{Alonso, Gustavo and Jensen, Christian S. and Mitschang, Bernhard},
  title =	{{05421 Executive Summary – Data Always and Everywhere – Management of Mobile, Ubiquitous, and Pervasive Data}},
  booktitle =	{Data Always and Everywhere - Management of Mobile, Ubiquitous, Pervasive, and Sensor Data},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{5421},
  editor =	{Gustavo Alonso and Christian S. Jensen and Bernhard Mitschang},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.05421.2},
  URN =		{urn:nbn:de:0030-drops-7947},
  doi =		{10.4230/DagSemProc.05421.2},
  annote =	{Keywords: Mobile Data Management, Ubiquitous Computing, Pervasive Computing, Streaming Data, Middleware, Data Integration, Data Placement, Ad-hoc Networking, Mi}
}
Document
DOI: 10.4230/DagSemProc.04441.6
04441 Working Group – Research Issues in Mobile Querying

Authors: Martin Breunig and Christian S. Jensen

Published in: Dagstuhl Seminar Proceedings, Volume 4441, Mobile Information Management (2005)

Abstract
This document reports on key aspects of the discussions conducted within the working group. In particular, the document aims to offer a structured and somewhat digested summary of the group's discussions. The document first offers concepts that enable characterization of "mobile queries'' as well as the types of systems that enable such queries. It explores the notion of context in mobile queries. The document ends with a few observations, mainly regarding challenges.
Cite as

Martin Breunig and Christian S. Jensen. 04441 Working Group – Research Issues in Mobile Querying. In Mobile Information Management. Dagstuhl Seminar Proceedings, Volume 4441, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2005)

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@InProceedings{breunig_et_al:DagSemProc.04441.6,
  author =	{Breunig, Martin and Jensen, Christian S.},
  title =	{{04441 Working Group – Research Issues in Mobile Querying}},
  booktitle =	{Mobile Information Management},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4441},
  editor =	{Margaret H. Dunham and Birgitta K\"{o}nig-Ries and Evaggelia Pitoura and Peter Reiher and Can T\"{u}rker},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04441.6},
  URN =		{urn:nbn:de:0030-drops-1651},
  doi =		{10.4230/DagSemProc.04441.6},
  annote =	{Keywords: Mobile Queries}
}
Document
DOI: 10.4230/DagSemProc.04441.8
04441 Working Group – Towards a Handbook for User-Centred Mobile Application Design

Authors: Susanne Boll, Martin Breunig, Nigel Davies, Christian S. Jensen, Birgitta König-Ries, Rainer Malaka, Florian Matthes, Christoforos Panayiotou, Simonas Saltenis, and Thomas Schwarz

Published in: Dagstuhl Seminar Proceedings, Volume 4441, Mobile Information Management (2005)

Abstract
Why do we have difficulties designing mobile apps? Is there a "Mobile RUP"?
Cite as

Susanne Boll, Martin Breunig, Nigel Davies, Christian S. Jensen, Birgitta König-Ries, Rainer Malaka, Florian Matthes, Christoforos Panayiotou, Simonas Saltenis, and Thomas Schwarz. 04441 Working Group – Towards a Handbook for User-Centred Mobile Application Design. In Mobile Information Management. Dagstuhl Seminar Proceedings, Volume 4441, pp. 1-8, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2005)

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@InProceedings{boll_et_al:DagSemProc.04441.8,
  author =	{Boll, Susanne and Breunig, Martin and Davies, Nigel and Jensen, Christian S. and K\"{o}nig-Ries, Birgitta and Malaka, Rainer and Matthes, Florian and Panayiotou, Christoforos and Saltenis, Simonas and Schwarz, Thomas},
  title =	{{04441 Working Group – Towards a Handbook for User-Centred Mobile Application Design}},
  booktitle =	{Mobile Information Management},
  pages =	{1--8},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2005},
  volume =	{4441},
  editor =	{Margaret H. Dunham and Birgitta K\"{o}nig-Ries and Evaggelia Pitoura and Peter Reiher and Can T\"{u}rker},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04441.8},
  URN =		{urn:nbn:de:0030-drops-1662},
  doi =		{10.4230/DagSemProc.04441.8},
  annote =	{Keywords: User-Centred Mobile Application Design}
}
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