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Documents authored by Hagen, Hans


Document
Interactive Quality Inspection of Measured Deviations in Sheet Metal Assemblies

Authors: Felix Claus, Hans Hagen, Viktor Leonhardt, Heike Leitte, and Bernd Hamann

Published in: OASIcs, Volume 89, 2nd International Conference of the DFG International Research Training Group 2057 – Physical Modeling for Virtual Manufacturing (iPMVM 2020)


Abstract
We present an exploratory data analysis approach for finite element (FE) simulations to interactively inspect measured deviations in sheet metals arising in automotive applications. Exterior car body parts consist of large visible surfaces, and strict tolerances must be met by them to satisfy both aesthetic requirements and quality performance requirements. To fulfill quality requirements like gap and flushness, exterior vehicle components have adjustable mechanical boundaries. These boundaries are used to influence the shape and position of a sheet metal part relative to its chassis. We introduce a method that supports an inspection engineer with an interactive framework that makes possible a detailed analysis of measured sheet metal deviation fields generated from 3D scans. An engineer can interactively change boundary conditions and obtains the resulting deviation field in real-time. Thus, it is possible to determine viable and desirable adjustments efficiently, leading to time and cost savings in the assembly process.

Cite as

Felix Claus, Hans Hagen, Viktor Leonhardt, Heike Leitte, and Bernd Hamann. Interactive Quality Inspection of Measured Deviations in Sheet Metal Assemblies. In 2nd International Conference of the DFG International Research Training Group 2057 – Physical Modeling for Virtual Manufacturing (iPMVM 2020). Open Access Series in Informatics (OASIcs), Volume 89, pp. 6:1-6:18, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)


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@InProceedings{claus_et_al:OASIcs.iPMVM.2020.6,
  author =	{Claus, Felix and Hagen, Hans and Leonhardt, Viktor and Leitte, Heike and Hamann, Bernd},
  title =	{{Interactive Quality Inspection of Measured Deviations in Sheet Metal Assemblies}},
  booktitle =	{2nd International Conference of the DFG International Research Training Group 2057 – Physical Modeling for Virtual Manufacturing (iPMVM 2020)},
  pages =	{6:1--6:18},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-183-2},
  ISSN =	{2190-6807},
  year =	{2021},
  volume =	{89},
  editor =	{Garth, Christoph and Aurich, Jan C. and Linke, Barbara and M\"{u}ller, Ralf and Ravani, Bahram and Weber, Gunther H. and Kirsch, Benjamin},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.iPMVM.2020.6},
  URN =		{urn:nbn:de:0030-drops-137554},
  doi =		{10.4230/OASIcs.iPMVM.2020.6},
  annote =	{Keywords: Data Analysis, Interactive Inspection, 3D-Metrology, Finite Element Simulation}
}
Document
Is Smaller Always Better? - Evaluating Video Compression Techniques for Simulation Ensembles

Authors: Patrick Ruediger, Christoph Garth, Hans Hagen, and Heike Leitte

Published in: OASIcs, Volume 89, 2nd International Conference of the DFG International Research Training Group 2057 – Physical Modeling for Virtual Manufacturing (iPMVM 2020)


Abstract
We provide an evaluation of the applicability of video compression techniques for compressing visualization image databases that are often used for in situ visualization. Considering relevant practical implementation aspects, we identify relevant compression parameters, and evaluate video compression for several test cases, involving several data sets and visualization methods; we use three different video codecs. To quantify the benefits and drawbacks of video compression, we employ metrics for image quality, compression rate, and performance. The experiments discussed provide insight into good choices of parameter values, working well in the considered cases.

Cite as

Patrick Ruediger, Christoph Garth, Hans Hagen, and Heike Leitte. Is Smaller Always Better? - Evaluating Video Compression Techniques for Simulation Ensembles. In 2nd International Conference of the DFG International Research Training Group 2057 – Physical Modeling for Virtual Manufacturing (iPMVM 2020). Open Access Series in Informatics (OASIcs), Volume 89, pp. 10:1-10:18, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)


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@InProceedings{ruediger_et_al:OASIcs.iPMVM.2020.10,
  author =	{Ruediger, Patrick and Garth, Christoph and Hagen, Hans and Leitte, Heike},
  title =	{{Is Smaller Always Better? - Evaluating Video Compression Techniques for Simulation Ensembles}},
  booktitle =	{2nd International Conference of the DFG International Research Training Group 2057 – Physical Modeling for Virtual Manufacturing (iPMVM 2020)},
  pages =	{10:1--10:18},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-183-2},
  ISSN =	{2190-6807},
  year =	{2021},
  volume =	{89},
  editor =	{Garth, Christoph and Aurich, Jan C. and Linke, Barbara and M\"{u}ller, Ralf and Ravani, Bahram and Weber, Gunther H. and Kirsch, Benjamin},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.iPMVM.2020.10},
  URN =		{urn:nbn:de:0030-drops-137591},
  doi =		{10.4230/OASIcs.iPMVM.2020.10},
  annote =	{Keywords: Image Database, CinemaDB, Video Compression, Evaluation, Benchmark, In-situ}
}
Document
Complete Volume
OASIcs, Volume 27, VLUDS'11, Complete Volume

Authors: Christoph Garth, Ariane Middel, and Hans Hagen

Published in: OASIcs, Volume 27, Visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering - Proceedings of IRTG 1131 Workshop 2011


Abstract
OASIcs, Volume 27, VLUDS'11, Complete Volume

Cite as

Christoph Garth, Ariane Middel, and Hans Hagen. OASIcs, Volume 27, VLUDS'11, Complete Volume. In Visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering - Proceedings of IRTG 1131 Workshop 2011. Open Access Series in Informatics (OASIcs), Volume 27, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2013)


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@Proceedings{garth_et_al:OASIcs.VLUDS.2011,
  title =	{{OASIcs, Volume 27, VLUDS'11, Complete Volume}},
  booktitle =	{Visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering - Proceedings of IRTG 1131 Workshop 2011},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-46-0},
  ISSN =	{2190-6807},
  year =	{2013},
  volume =	{27},
  editor =	{Garth, Christoph and Middel, Ariane and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2011},
  URN =		{urn:nbn:de:0030-drops-40780},
  doi =		{10.4230/OASIcs.VLUDS.2011},
  annote =	{Keywords: Computer Graphics}
}
Document
Front Matter
Frontmatter, Table of Contents, Preface, List of Authors

Authors: Christoph Garth, Ariane Middel, and Hans Hagen

Published in: OASIcs, Volume 27, Visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering - Proceedings of IRTG 1131 Workshop 2011


Abstract
Frontmatter, Table of Contents, Preface, List of Authors

Cite as

Christoph Garth, Ariane Middel, and Hans Hagen. Frontmatter, Table of Contents, Preface, List of Authors. In Visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering - Proceedings of IRTG 1131 Workshop 2011. Open Access Series in Informatics (OASIcs), Volume 27, pp. i-xi, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2012)


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@InProceedings{garth_et_al:OASIcs.VLUDS.2011.i,
  author =	{Garth, Christoph and Middel, Ariane and Hagen, Hans},
  title =	{{Frontmatter, Table of Contents, Preface, List of Authors}},
  booktitle =	{Visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering - Proceedings of IRTG 1131 Workshop 2011},
  pages =	{i--xi},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-46-0},
  ISSN =	{2190-6807},
  year =	{2012},
  volume =	{27},
  editor =	{Garth, Christoph and Middel, Ariane and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2011.i},
  URN =		{urn:nbn:de:0030-drops-37365},
  doi =		{10.4230/OASIcs.VLUDS.2011.i},
  annote =	{Keywords: Frontmatter, Table of Contents, Preface, List of Authors}
}
Document
Complete Volume
DFU, Volume 1, Scientific Visualization: Advanced Concepts, Complete Volume

Authors: Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 1, Scientific Visualization: Advanced Concepts (2010)


Abstract
DFU, Volume 1, Scientific Visualization: Advanced Concepts, Complete Volume

Cite as

Hans Hagen. DFU, Volume 1, Scientific Visualization: Advanced Concepts, Complete Volume. In Scientific Visualization: Advanced Concepts. Dagstuhl Follow-Ups, Volume 1, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2012)


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@Collection{DFU.SciViz.2010,
  title =	{{DFU, Volume 1, Scientific Visualization: Advanced Concepts, Complete Volume}},
  booktitle =	{Scientific Visualization: Advanced Concepts},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-19-4},
  ISSN =	{1868-8977},
  year =	{2012},
  volume =	{1},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.SciViz.2010},
  URN =		{urn:nbn:de:0030-drops-36002},
  doi =		{10.4230/DFU.SciViz.2010},
  annote =	{Keywords: Computer Graphics, Image Processing and Computer Vision, Physical Sciences and Engineering, Life and Medical Sciences}
}
Document
Complete Volume
DFU, Volume 2, Scientific Visualization: Interactions, Features, Metaphors, Complete Volume

Authors: Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
DFU, Volume 2, Scientific Visualization: Interactions, Features, Metaphors, Complete Volume

Cite as

Hans Hagen. DFU, Volume 2, Scientific Visualization: Interactions, Features, Metaphors, Complete Volume. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2012)


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@Collection{DFU.Vol2.SciViz.2011,
  title =	{{DFU, Volume 2, Scientific Visualization: Interactions, Features, Metaphors, Complete Volume}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2012},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011},
  URN =		{urn:nbn:de:0030-drops-36013},
  doi =		{10.4230/DFU.Vol2.SciViz.2011},
  annote =	{Keywords: Computer Graphics, Image Processing and Computer Vision, Physical Sciences and Engineering, Life and Medical Sciences}
}
Document
Complete Volume
OASIcs, Volume 19, VLUDS'10, Complete Volume

Authors: Ariane Middel, Inga Scheler, and Hans Hagen

Published in: OASIcs, Volume 19, Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop) (2011)


Abstract
OASIcs, Volume 19, VLUDS'10, Complete Volume

Cite as

Ariane Middel, Inga Scheler, and Hans Hagen. OASIcs, Volume 19, VLUDS'10, Complete Volume. In Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop). Open Access Series in Informatics (OASIcs), Volume 19, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2012)


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@Proceedings{middel_et_al:OASIcs.VLUDS.2010,
  title =	{{OASIcs, Volume 19, VLUDS'10, Complete Volume}},
  booktitle =	{Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop)},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-29-3},
  ISSN =	{2190-6807},
  year =	{2012},
  volume =	{19},
  editor =	{Middel, Ariane and Scheler, Inga and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2010},
  URN =		{urn:nbn:de:0030-drops-35814},
  doi =		{10.4230/OASIcs.VLUDS.2010},
  annote =	{Keywords: Computer Graphics}
}
Document
Frontmatter, Table of Contents, Preface, List of Authors

Authors: Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
Frontmatter, Table of Contents, Preface, List of Authors

Cite as

Hans Hagen. Frontmatter, Table of Contents, Preface, List of Authors. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, pp. 0:i-0:xiv, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InCollection{hagen:DFU.Vol2.SciViz.2011.i,
  author =	{Hagen, Hans},
  title =	{{Frontmatter, Table of Contents, Preface, List of Authors}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  pages =	{0:i--0:xiv},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2011},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011.i},
  URN =		{urn:nbn:de:0030-drops-32822},
  doi =		{10.4230/DFU.Vol2.SciViz.2011.i},
  annote =	{Keywords: Frontmatter, Table of Contents, Preface, List of Authors}
}
Document
CakES: Cake Metaphor for Analyzing Safety Issues of Embedded Systems

Authors: Yasmin I. Al-Zokari, Taimur Khan, Daniel Schneider, Dirk Zeckzer, and Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
Embedded systems are used everywhere. They are complex systems whose failure may cause death or injury to people or may damage the environment are required to be safety safe. Therefore, these systems need to be analyzed. Fault tree analysis is a common way for performing safety analysis. It generates a large amount of interconnected data that itself needs to be analyzed to help different domain experts (e.g., engineers and safety analysts) in their decisions for improving the system’s safety. Additional difficulties occur for the experts in communication and in linking the data (e.g., information of basic events or minimal cut sets) to the actual parts of the system (model). Therefore, a large amount of time and effort is being spent on discussions, searching,and navigating through the data. To overcome this, we present a new metaphor called "CakES" consisting of multiple views visualizing the data generated by fault tree analysis and linking them to the actual parts of the model by intuitive interaction. Using the interaction techniques of CakES the user can directly explore the safety related data without navigating through the fault tree while retaining an overview of all critical aspects in the model.

Cite as

Yasmin I. Al-Zokari, Taimur Khan, Daniel Schneider, Dirk Zeckzer, and Hans Hagen. CakES: Cake Metaphor for Analyzing Safety Issues of Embedded Systems. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, pp. 1-16, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InCollection{alzokari_et_al:DFU.Vol2.SciViz.2011.1,
  author =	{Al-Zokari, Yasmin I. and Khan, Taimur and Schneider, Daniel and Zeckzer, Dirk and Hagen, Hans},
  title =	{{CakES: Cake Metaphor for Analyzing Safety Issues of Embedded Systems}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  pages =	{1--16},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2011},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011.1},
  URN =		{urn:nbn:de:0030-drops-32844},
  doi =		{10.4230/DFU.Vol2.SciViz.2011.1},
  annote =	{Keywords: Fault Tree Analysis, minimal cut sets, basic events, information visualization, scientific visualization, engineering, tiled-wall, multiple monitor sy}
}
Document
Framework for Comprehensive Size and Resolution Utilization of Arbitrary Displays

Authors: Taimur Khan, Daniel Schneider, Yasmin Al-Zokari, Dirk Zeckzer, and Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
Scalable large high-resolution displays such as tiled displays are imperative for the visualization of large and complex datasets. In recent times, the relatively low costs for setting up large display systems have led to an highly increased usage of such devices. However, it is equally vital to optimally utilize their size and resolution to effectively explore such data through a combination of diverse visualizations, views, and interaction mechanisms. In this paper, we present a lightweight dispatcher framework which facilitates input management, focus management, and the execution of several interrelated yet independent visualizations. The approach is deliberately kept flexible to not only tackle different hardware configurations but also the amount of visualization applications to be implemented. This is demonstrated through a scenario that executes four interrelated visualizations equally well on both a 5 PC tiled-wall and a single desktop. The key contribution of this work is the ability to extend the tiled-wall to work with multiple applications for enhanced size and resolution utilization of such displays.

Cite as

Taimur Khan, Daniel Schneider, Yasmin Al-Zokari, Dirk Zeckzer, and Hans Hagen. Framework for Comprehensive Size and Resolution Utilization of Arbitrary Displays. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, pp. 144-159, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InCollection{khan_et_al:DFU.Vol2.SciViz.2011.144,
  author =	{Khan, Taimur and Schneider, Daniel and Al-Zokari, Yasmin and Zeckzer, Dirk and Hagen, Hans},
  title =	{{Framework for Comprehensive Size and Resolution Utilization of Arbitrary Displays}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  pages =	{144--159},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2011},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011.144},
  URN =		{urn:nbn:de:0030-drops-32916},
  doi =		{10.4230/DFU.Vol2.SciViz.2011.144},
  annote =	{Keywords: Large and High-res Displays, Coordinated and Multiple Views, Human Computer Interaction}
}
Document
Generation of Adaptive Streak Surfaces Using Moving Least Squares

Authors: Harald Obermaier, Martin Hering-Bertram, Jörg Kuhnert, and Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
We introduce a novel method for the generation of fully adaptive streak surfaces in time-varying flow fields based on particle advection and adaptive mesh refinement. Moving least squares approximation plays an important role in multiple stages of the proposed algorithm, which adaptively refines the surface based on curvature approximation and circumradius properties of the underlying Delaunay mesh. We utilize the grid-less Moving Least Squares approximation method for both curvature and surface estimation as well as vector field evaluation during particle advection. Delaunay properties of the surface triangulation are guaranteed by edge flipping operations on the progressive surface mesh. The results of this work illustrate the benefit of adaptivity techniques to streak surface generation and provide the means for a qualitative analysis of the presented approach.

Cite as

Harald Obermaier, Martin Hering-Bertram, Jörg Kuhnert, and Hans Hagen. Generation of Adaptive Streak Surfaces Using Moving Least Squares. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, pp. 260-275, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InCollection{obermaier_et_al:DFU.Vol2.SciViz.2011.260,
  author =	{Obermaier, Harald and Hering-Bertram, Martin and Kuhnert, J\"{o}rg and Hagen, Hans},
  title =	{{Generation of Adaptive Streak Surfaces Using Moving Least Squares}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  pages =	{260--275},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2011},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011.260},
  URN =		{urn:nbn:de:0030-drops-32982},
  doi =		{10.4230/DFU.Vol2.SciViz.2011.260},
  annote =	{Keywords: scattered, flow, streak surface, adaptivity, moving least squares}
}
Document
ViSSaAn: Visual Support for Safety Analysis

Authors: Yi Yang, Dirk Zeckzer, Peter Liggesmeyer, and Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
Safety of technical systems are becoming more and more important nowadays. Fault trees and minimal cut sets are usually used to attack the problems of assessing safety-critical systems. A visualization system named ViSSaAn, consisting of a matrix view, is proposed that supports an efficient safety analysis based on the information from these techniques. Interactions such as zooming and grouping are provided to support the task of finding the safety problems from the analysis information. An example based on real data shows the usefulness of ViSSaAn.

Cite as

Yi Yang, Dirk Zeckzer, Peter Liggesmeyer, and Hans Hagen. ViSSaAn: Visual Support for Safety Analysis. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, pp. 378-395, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InCollection{yang_et_al:DFU.Vol2.SciViz.2011.378,
  author =	{Yang, Yi and Zeckzer, Dirk and Liggesmeyer, Peter and Hagen, Hans},
  title =	{{ViSSaAn: Visual Support for Safety Analysis}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  pages =	{378--395},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2011},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011.378},
  URN =		{urn:nbn:de:0030-drops-33073},
  doi =		{10.4230/DFU.Vol2.SciViz.2011.378},
  annote =	{Keywords: Safety Analysis, Fault Tree Analysis, Minimal Cut Sets, Safety Visualization, Information Visualization}
}
Document
Scientific Visualization (Dagstuhl Seminar 11231)

Authors: Min Chen, Hans Hagen, Charles D. Hansen, and Arie Kaufman

Published in: Dagstuhl Reports, Volume 1, Issue 6 (2011)


Abstract
This report documents the program and the outcomes of Dagstuhl Seminar 11231 ``Scientific Visualization''.

Cite as

Min Chen, Hans Hagen, Charles D. Hansen, and Arie Kaufman. Scientific Visualization (Dagstuhl Seminar 11231). In Dagstuhl Reports, Volume 1, Issue 6, pp. 1-23, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@Article{chen_et_al:DagRep.1.6.1,
  author =	{Chen, Min and Hagen, Hans and Hansen, Charles D. and Kaufman, Arie},
  title =	{{Scientific Visualization (Dagstuhl Seminar 11231)}},
  pages =	{1--23},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2011},
  volume =	{1},
  number =	{6},
  editor =	{Chen, Min and Hagen, Hans and Hansen, Charles D. and Kaufman, Arie},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.1.6.1},
  URN =		{urn:nbn:de:0030-drops-32574},
  doi =		{10.4230/DagRep.1.6.1},
  annote =	{Keywords: Scientific Visualization, Biomedical Visualization, Integrated Multifield Visualization, Uncertainty Visualization, Scalable Visualization}
}
Document
Front Matter
Frontmatter, Table of Contents, Preface

Authors: Ariane Middel, Inga Scheler, and Hans Hagen

Published in: OASIcs, Volume 19, Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop) (2011)


Abstract
Frontmatter, Table of Contents, Preface

Cite as

Ariane Middel, Inga Scheler, and Hans Hagen. Frontmatter, Table of Contents, Preface. In Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop). Open Access Series in Informatics (OASIcs), Volume 19, pp. i-x, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InProceedings{middel_et_al:OASIcs.VLUDS.2010.i,
  author =	{Middel, Ariane and Scheler, Inga and Hagen, Hans},
  title =	{{Frontmatter, Table of Contents, Preface}},
  booktitle =	{Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop)},
  pages =	{i--x},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-29-3},
  ISSN =	{2190-6807},
  year =	{2011},
  volume =	{19},
  editor =	{Middel, Ariane and Scheler, Inga and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2010.i},
  URN =		{urn:nbn:de:0030-drops-30904},
  doi =		{10.4230/OASIcs.VLUDS.2010.i},
  annote =	{Keywords: Frontmatter, Table of Contents, Preface}
}
Document
A Survey of Interface Tracking Methods in Multi-phase Fluid Visualization

Authors: Fang Chen and Hans Hagen

Published in: OASIcs, Volume 19, Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop) (2011)


Abstract
A central feature that scientists are interested in is the dynamics of fluid interfaces or the so called material boundaries in multi-fluid simulation . Visualization techniques for capturing fluid interface are based on one of about three basic algorithms. In this paper, we give a survey of the existing interface tracking algorithms, including backgrounds, terms, procedures as well as pointers to details and further reading. We also provide a glance at the mathematical fundamentals of multi-fluid dynamics for scientists who are interested in understanding the underlying math and physics of multi-phase fluid simulation.

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Fang Chen and Hans Hagen. A Survey of Interface Tracking Methods in Multi-phase Fluid Visualization. In Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop). Open Access Series in Informatics (OASIcs), Volume 19, pp. 11-19, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InProceedings{chen_et_al:OASIcs.VLUDS.2010.11,
  author =	{Chen, Fang and Hagen, Hans},
  title =	{{A Survey of Interface Tracking Methods in Multi-phase Fluid Visualization}},
  booktitle =	{Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop)},
  pages =	{11--19},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-29-3},
  ISSN =	{2190-6807},
  year =	{2011},
  volume =	{19},
  editor =	{Middel, Ariane and Scheler, Inga and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2010.11},
  URN =		{urn:nbn:de:0030-drops-30914},
  doi =		{10.4230/OASIcs.VLUDS.2010.11},
  annote =	{Keywords: Multi-phase fluid, interface tracking, topology methods}
}
Document
On Moving Least Squares Based Flow Visualization

Authors: Harald Obermaier, Martin Hering-Bertram, Jörg Kuhnert, and Hans Hagen

Published in: OASIcs, Volume 19, Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop) (2011)


Abstract
Modern simulation and measurement methods tend to produce meshfree data sets if modeling of processes or objects with free surfaces or boundaries is desired. In Computational Fluid Dynamics (CFD), such data sets are described by particle-based vector fields. This paper presents a summary of a selection of methods for the extraction of geometric features of such point-based vector fields while pointing out its challenges, limitations, and applications.

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Harald Obermaier, Martin Hering-Bertram, Jörg Kuhnert, and Hans Hagen. On Moving Least Squares Based Flow Visualization. In Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop). Open Access Series in Informatics (OASIcs), Volume 19, pp. 55-63, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InProceedings{obermaier_et_al:OASIcs.VLUDS.2010.55,
  author =	{Obermaier, Harald and Hering-Bertram, Martin and Kuhnert, J\"{o}rg and Hagen, Hans},
  title =	{{On Moving Least Squares Based Flow  Visualization}},
  booktitle =	{Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop)},
  pages =	{55--63},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-29-3},
  ISSN =	{2190-6807},
  year =	{2011},
  volume =	{19},
  editor =	{Middel, Ariane and Scheler, Inga and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2010.55},
  URN =		{urn:nbn:de:0030-drops-30979},
  doi =		{10.4230/OASIcs.VLUDS.2010.55},
  annote =	{Keywords: Moving Least Squares, Approximation, Flow, Scientific Visualization}
}
Document
Modeling and visualizing urban sprawl and carbon footprints in Phoenix metropolitan area

Authors: Sebastian Petsch, Subhrajit Guhathakurta, and Hans Hagen

Published in: OASIcs, Volume 19, Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop) (2011)


Abstract
Urban planners are dealing with problems of urban sprawl and CO2 emissions. The multidimensional character of these phenomena requires new analysis and visualization tools that are unavailable in platforms like the Geographical Information Systems (GIS). This paper, first, presents an approach for measuring and monitoring urban sprawl and carbon footprints. Second, it offers a three-dimensional visualization method that takes into account the multi-dimensional nature of the data. The visualization of the data is based on an intuitive approach involving B-Splines and Bezier techniques to create three-dimensional surfaces. Finally the paper introduces an analysis tool for planners and decision makers to examine household carbon footprints in relation to their direct spatial neighborhood based on unstructured census data.

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Sebastian Petsch, Subhrajit Guhathakurta, and Hans Hagen. Modeling and visualizing urban sprawl and carbon footprints in Phoenix metropolitan area. In Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop). Open Access Series in Informatics (OASIcs), Volume 19, pp. 64-72, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InProceedings{petsch_et_al:OASIcs.VLUDS.2010.64,
  author =	{Petsch, Sebastian and Guhathakurta, Subhrajit and Hagen, Hans},
  title =	{{Modeling and visualizing urban sprawl and carbon footprints in Phoenix metropolitan area}},
  booktitle =	{Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop)},
  pages =	{64--72},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-29-3},
  ISSN =	{2190-6807},
  year =	{2011},
  volume =	{19},
  editor =	{Middel, Ariane and Scheler, Inga and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2010.64},
  URN =		{urn:nbn:de:0030-drops-30982},
  doi =		{10.4230/OASIcs.VLUDS.2010.64},
  annote =	{Keywords: Urban Sprawl, GHG Emissions, Visualization, Case Studies}
}
Document
Methods for Feature Detection in Point Clouds

Authors: Christopher Weber, Stefanie Hahmann, and Hans Hagen

Published in: OASIcs, Volume 19, Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop) (2011)


Abstract
This paper gives an overview over several techniques for detection of features, and in particular sharp features, on point-sampled geometry. In addition, a new technique using the Gauss map is shown. Given an unstructured point cloud, this method computes a Gauss map clustering on local neighborhoods in order to discard all points that are unlikely to belong to a sharp feature. A single parameter is used in this stage to control the sensitivity of the feature detection.

Cite as

Christopher Weber, Stefanie Hahmann, and Hans Hagen. Methods for Feature Detection in Point Clouds. In Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop). Open Access Series in Informatics (OASIcs), Volume 19, pp. 90-99, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InProceedings{weber_et_al:OASIcs.VLUDS.2010.90,
  author =	{Weber, Christopher and Hahmann, Stefanie and Hagen, Hans},
  title =	{{Methods for Feature Detection in Point Clouds}},
  booktitle =	{Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop)},
  pages =	{90--99},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-29-3},
  ISSN =	{2190-6807},
  year =	{2011},
  volume =	{19},
  editor =	{Middel, Ariane and Scheler, Inga and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2010.90},
  URN =		{urn:nbn:de:0030-drops-31018},
  doi =		{10.4230/OASIcs.VLUDS.2010.90},
  annote =	{Keywords: point cloud, sharp features, reconstruction, Gaussmap, clustering}
}
Document
09251 Abstracts Collection – Scientific Visualization

Authors: David S. Ebert, Eduard Gröller, Hans Hagen, and Arie Kaufman

Published in: Dagstuhl Seminar Proceedings, Volume 9251, Scientific Visualization (2010)


Abstract
From 06-14-2009 to 06-19-2009, the Dagstuhl Seminar 09251 ``Scientific Visualization '' was held in Schloss Dagstuhl~--~Leibniz Center for Informatics. During the seminar, over 50 international 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.

Cite as

David S. Ebert, Eduard Gröller, Hans Hagen, and Arie Kaufman. 09251 Abstracts Collection – Scientific Visualization. In Scientific Visualization. Dagstuhl Seminar Proceedings, Volume 9251, pp. 1-36, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2010)


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@InProceedings{ebert_et_al:DagSemProc.09251.1,
  author =	{Ebert, David S. and Gr\"{o}ller, Eduard and Hagen, Hans and Kaufman, Arie},
  title =	{{09251 Abstracts Collection – Scientific Visualization}},
  booktitle =	{Scientific Visualization},
  pages =	{1--36},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2010},
  volume =	{9251},
  editor =	{David S. Ebert and Eduard Gr\"{o}ller and Hans Hagen and Arie Kaufman},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09251.1},
  URN =		{urn:nbn:de:0030-drops-27436},
  doi =		{10.4230/DagSemProc.09251.1},
  annote =	{Keywords: Scientific visualization, Data analysis, Data modeling, Segmentation, Knowledge extraction, Ubiquitous visualization, Categorical visualization, Intelligent/automatic visualization, Point-based/mesh-free visualization}
}
Document
Frontmatter, Table of Contents, Preface

Authors: Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 1, Scientific Visualization: Advanced Concepts (2010)


Abstract
Frontmatter. Table of contents. Preface.

Cite as

Hans Hagen. Frontmatter, Table of Contents, Preface. In Scientific Visualization: Advanced Concepts. Dagstuhl Follow-Ups, Volume 1, pp. 0:i-0:x, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2010)


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@InCollection{hagen:DFU.SciViz.2010.I,
  author =	{Hagen, Hans},
  title =	{{Frontmatter, Table of Contents, Preface}},
  booktitle =	{Scientific Visualization: Advanced Concepts},
  pages =	{0:i--0:x},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-19-4},
  ISSN =	{1868-8977},
  year =	{2010},
  volume =	{1},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.SciViz.2010.I},
  URN =		{urn:nbn:de:0030-drops-26928},
  doi =		{10.4230/DFU.SciViz.2010.I},
  annote =	{Keywords: Frontmatter, Table of Contents, Preface}
}
Document
Computing an Optimal Layout for Cone Trees

Authors: Dirk Zeckzer, Fang Chen, and Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 1, Scientific Visualization: Advanced Concepts (2010)


Abstract
Many visual representations for trees have been developed in information and software visualization. One of them are cone trees, a well-known three-dimensional representation for trees. This paper is based on an approach for constructing cone trees bottom-up. For this approach, an optimal layout for these trees is given together with a proof that based on the assumptions, there can be no better layouts. This comprises special cases, an optimal constant for the general case, and a post-processing step improving the layout.

Cite as

Dirk Zeckzer, Fang Chen, and Hans Hagen. Computing an Optimal Layout for Cone Trees. In Scientific Visualization: Advanced Concepts. Dagstuhl Follow-Ups, Volume 1, pp. 11-29, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2010)


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@InCollection{zeckzer_et_al:DFU.SciViz.2010.11,
  author =	{Zeckzer, Dirk and Chen, Fang and Hagen, Hans},
  title =	{{Computing an Optimal Layout for Cone Trees}},
  booktitle =	{Scientific Visualization: Advanced Concepts},
  pages =	{11--29},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-19-4},
  ISSN =	{1868-8977},
  year =	{2010},
  volume =	{1},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.SciViz.2010.11},
  URN =		{urn:nbn:de:0030-drops-26947},
  doi =		{10.4230/DFU.SciViz.2010.11},
  annote =	{Keywords: Cone Trees, Information Visualization, Tree Layout}
}
Document
Tensor Field Reconstruction Based on Eigenvector and Eigenvalue Interpolation

Authors: Ingrid Hotz, Jaya Sreevalsan-Nair, Hans Hagen, and Bernd Hamann

Published in: Dagstuhl Follow-Ups, Volume 1, Scientific Visualization: Advanced Concepts (2010)


Abstract
Interpolation is an essential step in the visualization process. While most data from simulations or experiments are discrete many visualization methods are based on smooth, continuous data approximation or interpolation methods. We introduce a new interpolation method for symmetrical tensor fields given on a triangulated domain. Differently from standard tensor field interpolation, which is based on the tensor components, we use tensor invariants, eigenvectors and eigenvalues, for the interpolation. This interpolation minimizes the number of eigenvectors and eigenvalues computations by restricting it to mesh vertices and makes an exact integration of the tensor lines possible. The tensor field topology is qualitatively the same as for the component wise-interpolation. Since the interpolation decouples the ``shape'' and ``direction'' interpolation it is shape-preserving, what is especially important for tracing fibers in diffusion MRI data.

Cite as

Ingrid Hotz, Jaya Sreevalsan-Nair, Hans Hagen, and Bernd Hamann. Tensor Field Reconstruction Based on Eigenvector and Eigenvalue Interpolation. In Scientific Visualization: Advanced Concepts. Dagstuhl Follow-Ups, Volume 1, pp. 110-123, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2010)


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@InCollection{hotz_et_al:DFU.SciViz.2010.110,
  author =	{Hotz, Ingrid and Sreevalsan-Nair, Jaya and Hagen, Hans and Hamann, Bernd},
  title =	{{Tensor Field Reconstruction Based on Eigenvector and Eigenvalue Interpolation}},
  booktitle =	{Scientific Visualization: Advanced Concepts},
  pages =	{110--123},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-19-4},
  ISSN =	{1868-8977},
  year =	{2010},
  volume =	{1},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.SciViz.2010.110},
  URN =		{urn:nbn:de:0030-drops-27003},
  doi =		{10.4230/DFU.SciViz.2010.110},
  annote =	{Keywords: Tensor Field, Eigenvector, Eigenvalue, Interpolation}
}
Document
Audio-visual Virtual Reality System for Room Acoustics

Authors: Eduard Deines, Martin Hering-Bertram, Jan Mohring, Jevgenijs Jegorovs, and Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 1, Scientific Visualization: Advanced Concepts (2010)


Abstract
We present an audio-visual Virtual Reality display system for simulated sound fields. In addition to the room acoustic simulation by means of phonon tracing and finite element method this system includes the stereoscopic visualization of simulation results using a 3D back projection system as well as auralization by use of a professional sound equipment. For auralization purposes we develop a sound field synthesis approach for accurate control of the loudspeaker system.

Cite as

Eduard Deines, Martin Hering-Bertram, Jan Mohring, Jevgenijs Jegorovs, and Hans Hagen. Audio-visual Virtual Reality System for Room Acoustics. In Scientific Visualization: Advanced Concepts. Dagstuhl Follow-Ups, Volume 1, pp. 303-320, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2010)


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@InCollection{deines_et_al:DFU.SciViz.2010.303,
  author =	{Deines, Eduard and Hering-Bertram, Martin and Mohring, Jan and Jegorovs, Jevgenijs and Hagen, Hans},
  title =	{{Audio-visual Virtual Reality System for Room Acoustics}},
  booktitle =	{Scientific Visualization: Advanced Concepts},
  pages =	{303--320},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-19-4},
  ISSN =	{1868-8977},
  year =	{2010},
  volume =	{1},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.SciViz.2010.303},
  URN =		{urn:nbn:de:0030-drops-27128},
  doi =		{10.4230/DFU.SciViz.2010.303},
  annote =	{Keywords: Special Relativity, Minkowski, Spacetime, Virtual Camera}
}
Document
Accounting system for heterogeneous IP-networks (IPNA) implemented at Kaiserslautern University

Authors: Brian Worden, Claudia Baltes, Inga Scheler, Paul Müller, and Hans Hagen

Published in: Dagstuhl Seminar Proceedings, Volume 9211, Visualization and Monitoring of Network Traffic (2009)


Abstract
This paper describes an accounting system (IPNA) for heterogenous IP-networks with arbitrary topologies implemented at the university of Kaiserslautern. The produced data volume per unit is numerated. The collected data is stored in a database and offers different analysis possibilities. The results can be visualized and adapted to the users requirements. The main effort was to build a data traffic quota system for single units as well as groups of devices that also report exceeded quotas. The system itself only observes the network traffic. Interfaces offer tools to interact with the network. The IPNA consists of a back-end for the data- acquisition and -preparation and a front-end for configuration and visualization tasks including quality control.

Cite as

Brian Worden, Claudia Baltes, Inga Scheler, Paul Müller, and Hans Hagen. Accounting system for heterogeneous IP-networks (IPNA) implemented at Kaiserslautern University. In Visualization and Monitoring of Network Traffic. Dagstuhl Seminar Proceedings, Volume 9211, pp. 1-7, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2009)


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@InProceedings{worden_et_al:DagSemProc.09211.3,
  author =	{Worden, Brian and Baltes, Claudia and Scheler, Inga and M\"{u}ller, Paul and Hagen, Hans},
  title =	{{Accounting system for heterogeneous IP-networks (IPNA) implemented at Kaiserslautern University}},
  booktitle =	{Visualization and Monitoring of Network Traffic},
  pages =	{1--7},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9211},
  editor =	{Daniel A. Keim and Aiko Pras and J\"{u}rgen Sch\"{o}nw\"{a}lder and Pak Chung Wong},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09211.3},
  URN =		{urn:nbn:de:0030-drops-21557},
  doi =		{10.4230/DagSemProc.09211.3},
  annote =	{Keywords: Accounting system, IP-network, Communication, informa- tion visualization, online quality control}
}
Document
07291 Abstracts Collection – Scientific Visualization

Authors: David S. Ebert, Hans Hagen, Kenneth I. Joy, and Daniel A. Keim

Published in: Dagstuhl Seminar Proceedings, Volume 7291, Scientific Visualization (2008)


Abstract
From 15.07. to 20.07.07, the Dagstuhl Seminar 07291 ``Scientific Visualization'' was held in the International Conference and Research Center (IBFI),Schloss Dagstuhl. 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

David S. Ebert, Hans Hagen, Kenneth I. Joy, and Daniel A. Keim. 07291 Abstracts Collection – Scientific Visualization. In Scientific Visualization. Dagstuhl Seminar Proceedings, Volume 7291, pp. 1-18, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2008)


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@InProceedings{ebert_et_al:DagSemProc.07291.1,
  author =	{Ebert, David S. and Hagen, Hans and Joy, Kenneth I. and Keim, Daniel A.},
  title =	{{07291 Abstracts Collection – Scientific Visualization}},
  booktitle =	{Scientific Visualization},
  pages =	{1--18},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2008},
  volume =	{7291},
  editor =	{David S. Ebert and Hans Hagen and Kenneth I. Joy and Daniel A. Keim},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07291.1},
  URN =		{urn:nbn:de:0030-drops-14145},
  doi =		{10.4230/DagSemProc.07291.1},
  annote =	{Keywords: Markov chains, numerical methods, web information retrieval, performance evaluation, intrusion detection, aggregation-disaggregation methods, graph-oriented decomposition}
}
Document
07291 Summary – Scientific Visualization

Authors: David S. Ebert, Hans Hagen, Kenneth I. Joy, and Daniel A. Keim

Published in: Dagstuhl Seminar Proceedings, Volume 7291, Scientific Visualization (2008)


Abstract
Scientific visualization (SV) is concerned with the use of computer-generated images to aid the understanding, analysis and manipulation of data. Since its beginning in the early 90's, the techniques of SV have aided scientists, engineers, medical practitioners, and others in the study of a wide variety of data sets including, for example, high performance computing simulations, measured data from scanners (CAT, MR, confocal microscopy), internet traffic, and financial records. One of the important themes being nurtured under the aegis of Scientific Visualization is the utilization of the broad bandwidth of the human sensory system in steering and interpreting complex processes and simulations involving voluminous data sets across diverse scientific disciplines. Since vision dominates our sensory input, strong efforts have been made to bring the mathematical abstraction and modeling to our eyes through the mediation of computer graphics. This interplay between various application areas and their specific problem solving visualization techniques was emphasized in the proposed seminar.

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David S. Ebert, Hans Hagen, Kenneth I. Joy, and Daniel A. Keim. 07291 Summary – Scientific Visualization. In Scientific Visualization. Dagstuhl Seminar Proceedings, Volume 7291, pp. 1-2, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2008)


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@InProceedings{ebert_et_al:DagSemProc.07291.2,
  author =	{Ebert, David S. and Hagen, Hans and Joy, Kenneth I. and Keim, Daniel A.},
  title =	{{07291 Summary – Scientific Visualization}},
  booktitle =	{Scientific Visualization},
  pages =	{1--2},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2008},
  volume =	{7291},
  editor =	{David S. Ebert and Hans Hagen and Kenneth I. Joy and Daniel A. Keim},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07291.2},
  URN =		{urn:nbn:de:0030-drops-14132},
  doi =		{10.4230/DagSemProc.07291.2},
  annote =	{Keywords: Markov chains, numerical methods, web information retrieval, performance evaluation, intrusion detection, aggregation-disaggregation methods graph-oriented decomposition}
}
Document
04172 Abstracts Collection – Perspectives Workshop: Visualization and Image Processing of Tensor Fields

Authors: Joachim Weickert and Hans Hagen

Published in: Dagstuhl Seminar Proceedings, Volume 4172, Perspectives Workshop: Visualization and Image Processing of Tensor Fields (2006)


Abstract
From 18.04.04 to 23.04.04, the Dagstuhl Seminar 04172 ``Perspectives Workshop: Visualization and Image Processing of Tensor Fields'' was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. 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.

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Joachim Weickert and Hans Hagen. 04172 Abstracts Collection – Perspectives Workshop: Visualization and Image Processing of Tensor Fields. In Perspectives Workshop: Visualization and Image Processing of Tensor Fields. Dagstuhl Seminar Proceedings, Volume 4172, pp. 1-12, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2006)


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@InProceedings{weickert_et_al:DagSemProc.04172.1,
  author =	{Weickert, Joachim and Hagen, Hans},
  title =	{{04172 Abstracts Collection – Perspectives Workshop: Visualization and Image Processing of Tensor Fields}},
  booktitle =	{Perspectives Workshop: Visualization and Image Processing of Tensor Fields},
  pages =	{1--12},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2006},
  volume =	{4172},
  editor =	{Joachim Weickert and Hans Hagen},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.04172.1},
  URN =		{urn:nbn:de:0030-drops-4692},
  doi =		{10.4230/DagSemProc.04172.1},
  annote =	{Keywords: }
}
Document
Scientific Visualization (Dagstuhl Seminar 9724)

Authors: Hans Hagen, Gregory Nielson, and Frits Post

Published in: Dagstuhl Seminar Reports. Dagstuhl Seminar Reports, Volume 1 (2021)


Abstract

Cite as

Hans Hagen, Gregory Nielson, and Frits Post. Scientific Visualization (Dagstuhl Seminar 9724). Dagstuhl Seminar Report 181, pp. 1-30, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (1999)


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@TechReport{hagen_et_al:DagSemRep.181,
  author =	{Hagen, Hans and Nielson, Gregory and Post, Frits},
  title =	{{Scientific Visualization (Dagstuhl Seminar 9724)}},
  pages =	{1--30},
  ISSN =	{1619-0203},
  year =	{1999},
  type = 	{Dagstuhl Seminar Report},
  number =	{181},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.181},
  URN =		{urn:nbn:de:0030-drops-150681},
  doi =		{10.4230/DagSemRep.181},
}
Document
Scientific Visualization (Dagstuhl Seminar 9421)

Authors: Hans Hagen, Heinrich Müller, and Gregory N. Nielson

Published in: Dagstuhl Seminar Reports. Dagstuhl Seminar Reports, Volume 1 (2021)


Abstract

Cite as

Hans Hagen, Heinrich Müller, and Gregory N. Nielson. Scientific Visualization (Dagstuhl Seminar 9421). Dagstuhl Seminar Report 90, pp. 1-26, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (1994)


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@TechReport{hagen_et_al:DagSemRep.90,
  author =	{Hagen, Hans and M\"{u}ller, Heinrich and Nielson, Gregory N.},
  title =	{{Scientific Visualization (Dagstuhl Seminar 9421)}},
  pages =	{1--26},
  ISSN =	{1619-0203},
  year =	{1994},
  type = 	{Dagstuhl Seminar Report},
  number =	{90},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.90},
  URN =		{urn:nbn:de:0030-drops-149783},
  doi =		{10.4230/DagSemRep.90},
}
Document
Geometric Modelling (Dagstuhl Seminar 9326)

Authors: Gerald Farin, Hans Hagen, and Hartmut Noltemeier

Published in: Dagstuhl Seminar Reports. Dagstuhl Seminar Reports, Volume 1 (2021)


Abstract

Cite as

Gerald Farin, Hans Hagen, and Hartmut Noltemeier. Geometric Modelling (Dagstuhl Seminar 9326). Dagstuhl Seminar Report 67, pp. 1-17, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (1993)


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@TechReport{farin_et_al:DagSemRep.67,
  author =	{Farin, Gerald and Hagen, Hans and Noltemeier, Hartmut},
  title =	{{Geometric Modelling (Dagstuhl Seminar 9326)}},
  pages =	{1--17},
  ISSN =	{1619-0203},
  year =	{1993},
  type = 	{Dagstuhl Seminar Report},
  number =	{67},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.67},
  URN =		{urn:nbn:de:0030-drops-149551},
  doi =		{10.4230/DagSemRep.67},
}
Document
Scientific Visualization (Dagstuhl Seminar 9135)

Authors: Hans Hagen and Heinrich Müller

Published in: Dagstuhl Seminar Reports. Dagstuhl Seminar Reports, Volume 1 (2021)


Abstract

Cite as

Hans Hagen and Heinrich Müller. Scientific Visualization (Dagstuhl Seminar 9135). Dagstuhl Seminar Report 19, pp. 1-20, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (1991)


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@TechReport{hagen_et_al:DagSemRep.19,
  author =	{Hagen, Hans and M\"{u}ller, Heinrich},
  title =	{{Scientific Visualization (Dagstuhl Seminar 9135)}},
  pages =	{1--20},
  ISSN =	{1619-0203},
  year =	{1991},
  type = 	{Dagstuhl Seminar Report},
  number =	{19},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.19},
  URN =		{urn:nbn:de:0030-drops-149077},
  doi =		{10.4230/DagSemRep.19},
}
Document
Geometric Modelling (Dagstuhl Seminar 9127)

Authors: Gerald Farin, Hans Hagen, and Hartmut Noltemeier

Published in: Dagstuhl Seminar Reports. Dagstuhl Seminar Reports, Volume 1 (2021)


Abstract

Cite as

Gerald Farin, Hans Hagen, and Hartmut Noltemeier. Geometric Modelling (Dagstuhl Seminar 9127). Dagstuhl Seminar Report 17, pp. 1-20, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (1991)


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@TechReport{farin_et_al:DagSemRep.17,
  author =	{Farin, Gerald and Hagen, Hans and Noltemeier, Hartmut},
  title =	{{Geometric Modelling (Dagstuhl Seminar 9127)}},
  pages =	{1--20},
  ISSN =	{1619-0203},
  year =	{1991},
  type = 	{Dagstuhl Seminar Report},
  number =	{17},
  institution =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemRep.17},
  URN =		{urn:nbn:de:0030-drops-149054},
  doi =		{10.4230/DagSemRep.17},
}
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