
Dr. Simon Voelker
Leiter des Studiencenters Informatik
Mail: voelker@cs.rwth-aachen.de
Phone: +49 241 80 21058
Ahornstraße 55, building E3
D-52074 Aachen / Germany
Ich bin Leiter des Studiencenters Informatik und Koordinator des Prüfungsausschuss Informatik der RWTH Aachen.
Weiterhin bin ich Affiliated Researcher der Media Computing Group der RWTH Aachen. Zwischen 2016 und 2020 war ich stellvertretender Lehrstuhlleiter der Media Computing Group. Mein Forschungsbereich ist Human-Computer Interaction (HCI) und ich beschäftigt mich hauptsächlich mit den Themen ubiquitous computing, personal fabrication, touch input, interactive surfaces, and tangible user interfaces.
Ich bin zuständig für die folgenden Aufgabenbereich:
- Prüfungsausschuss Informatik
- Koordination der Lehre der Fachgruppe Informatik
Studierende können Antrage per Webformular an den Prüfungsausschuss Informatik stellen.
Lehre
- In der Lehre biete ich Vorlesung, Seminar und Praktika aus dem Bereich Human-Computer Interaction (HCI) an:
Sommersemester 22:
Wintersemester 21/22:
Zusätzlich dazu betreue ich Bachelor- und Masterarbeiten im Bereich der HCI.
2020
Sebastian Hueber; Christian Cherek; Philipp Wacker; Jan Borchers; Simon Voelker
Headbang: Using Head Gestures to Trigger Discrete Actions on Mobile Devices Konferenzbeitrag
In: Proceedings of 22nd International Conference on Human-Computer Interaction with Mobile Devices and Services, ACM, Oldenburg, Germany, 2020, ISBN: 9781450375160.
@inproceedings{hueber2020a,
title = {Headbang: Using Head Gestures to Trigger Discrete Actions on Mobile Devices},
author = {Sebastian Hueber and Christian Cherek and Philipp Wacker and Jan Borchers and Simon Voelker},
url = {https://doi.org/10.1145/3379503.3403538},
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year = {2020},
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booktitle = {Proceedings of 22nd International Conference on Human-Computer Interaction with Mobile Devices and Services},
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Philipp Wacker; Oliver Nowak; Simon Voelker; Jan Borchers
Evaluating Menu Techniques for Handheld AR with a Smartphone & Mid-Air Pen Konferenzbeitrag
In: Proceedings of 22nd International Conference on Human-Computer Interaction with Mobile Devices and Services, ACM, Oldenburg, Germany, 2020, ISBN: 978-1-4503-7516-0/20/10.
@inproceedings{wacker2020b,
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Philipp Wacker; Adrian Wagner; Simon Voelker; Jan Borchers
Heatmaps, Shadows, Bubbles, Rays: Comparing Mid-Air Pen Position Visualizations in Handheld AR Konferenzbeitrag
In: Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems, S. 719:1–719:11, ACM, Honolulu Hawaií, USA, 2020, ISBN: 978-1-4503-6708-0/20/04.
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Simon Voelker; Sebastian Hueber; Christian Corsten; Christian Remy
HeadReach: Using Head Tracking to Increase Reachability on Mobile Touch Devices Konferenzbeitrag
In: Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems, S. 739:1–739:12, ACM, Honolulu Hawaií, USA, 2020, ISBN: 978-1-4503-6708-0/20/04.
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Simon Voelker; Sebastian Hueber; Christian Holz; Christian Remy; Nicolai Marquardt
GazeConduits: Calibration-Free Cross-Device Collaboration through Gaze and Touch Konferenzbeitrag
In: Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems, S. 451:1–451:10, ACM, Honolulu Hawaií, USA, 2020, ISBN: 978-1-4503-5970-2/19/05.
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2019
Nur Al-huda Hamdan; Adrian Wagner; Simon Voelker; Jürgen Steimle; Jan Borchers
Demonstration of Springlets: Expressive, Flexible and Silent On-Skin Tactile Interfaces Konferenzbeitrag
In: Extended Abstracts of the 2019 CHI Conference on Human Factors in Computing Systems, ACM, Glasgow, Scotland UK, 2019, ISBN: 978-1-4503-5971-9/19/05.
@inproceedings{hamdan2019b,
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url = {https://doi.org/10.1145/3290607.3313255},
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Anke Brocker; Simon Voelker; Tony Zelun Zhang; Mathis Müller; Jan Borchers
Flowboard: A Visual Flow-Based Programming Environment for Embedded Coding Konferenzbeitrag
In: Extended Abstracts of the 2019 CHI Conference on Human Factors in Computing Systems, ACM, Glasgow, Scotland UK, 2019, ISBN: 978-1-4503-5971-9/19/05.
@inproceedings{brocker2019a,
title = {Flowboard: A Visual Flow-Based Programming Environment for Embedded Coding},
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url = {https://doi.org/10.1145/3290607.3313247},
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Krishna Subramanian; Ilya Zubarev; Simon Voelker; Jan Borchers
Supporting Data Workers to Perform Exploratory Programming Konferenzbeitrag
In: Extended Abstracts of the 2019 CHI Conference on Human Factors in Computing Systems, ACM, Glasgow, Scotland UK, 2019, ISBN: 978-1-4503-5971-9.
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Christian Cherek; David Asselborn; Simon Voelker; Jan Borchers
Off-Surface Tangibles: Exploring the Design Space of Midair Tangible Interaction Konferenzbeitrag
In: Extended Abstracts of the 2019 CHI Conference on Human Factors in Computing Systems, ACM, Glasgow, Scotland UK, 2019, ISBN: 978-1-4503-5971-9/19/05.
@inproceedings{cherek2019a,
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Christian Corsten; Marcel Lahaye; Jan Borchers; Simon Voelker
ForceRay: Extending Thumb Reach via Force Input Stabilizes Device Grip for Mobile Touch Input Konferenzbeitrag
In: Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems, S. 212:1–212:10, ACM, Glasgow, Scotland UK, 2019, ISBN: 978-1-4503-5970-2/19/05.
@inproceedings{corsten2019a,
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Philipp Wacker; Oliver Nowak; Simon Voelker; Jan Borchers
ARPen: Mid-Air Object Manipulation Techniques for a Bimanual AR System with Pen & Smartphone Konferenzbeitrag
In: Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems, S. 619:1–619:10, ACM, Glasgow, Scotland UK, 2019, ISBN: 978-1-4503-5970-2/19/05.
@inproceedings{wacker2019a,
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Nur Al-huda Hamdan; Adrian Wagner; Simon Voelker; Jürgen Steimle; Jan Borchers
Springlets: Expressive, Flexible and Silent On-Skin Tactile Interfaces Konferenzbeitrag
In: Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems, ACM, Glasgow, Scotland UK, 2019, ISBN: 978-1-4503-5970-2/19/05.
@inproceedings{hamdan2019a,
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2018
Philipp Wacker; Adrian Wagner; Simon Voelker; Jan Borchers
Physical Guides: An Analysis of 3D Sketching Performance on Physical Objects in Augmented Reality Konferenzbeitrag
In: Proceedings of the 6th Symposium on Spatial User Interaction, ACM, Berlin, Germany, 2018, ISBN: 978-1-4503-5708-1.
@inproceedings{wacker2018b,
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Krishna Subramanian; Johannes Maas; Michael Ellers; Chat Wacharamanotham; Simon Voelker; Jan Borchers
StatWire: Visual Flow-based Statistical Programming Konferenzbeitrag
In: Extended Abstracts of the 2018 CHI Conference on Human Factors in Computing Systems, S. LBW104:1–LBW104:6, ACM, Montreal QC, Canada, 2018, ISBN: 978-1-4503-5621-3.
@inproceedings{subramanian2018a,
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Philipp Wacker; Adrian Wagner; Simon Voelker; Jan Borchers
Physical Guides: An Analysis of 3D Sketching Performance on Physical Objects in Augmented Reality Konferenzbeitrag
In: Extended Abstracts of the 2018 CHI Conference on Human Factors in Computing Systems, S. LBW626:1–LBW626:6, ACM, Montreal QC, Canada, 2018, ISBN: 978-1-4503-5621-3.
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Christian Corsten; Simon Voelker; Andreas Link; Jan Borchers
Use the Force Picker, Luke: Space-Efficient Value Input on Force-Sensitive Mobile Touchscreens Konferenzbeitrag
In: Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems, S. 661:1–661:12, ACM, Montreal, Canada, 2018, ISBN: 978-1-4503-5620-6, (CHI ’18 Best Paper Award: Honorable Mention).
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Nur Al-huda Hamdan; Simon Voelker; Jan Borchers
Sketch&Stitch: Interactive Embroidery for E-Textiles Konferenzbeitrag
In: Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems, S. 82:1–82:13, ACM, Montreal, Canada, 2018, ISBN: 978-1-4503-5620-6.
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Florian Heller; Jan Thar; Dennis Lewandowski; Mirko Hartmann; Pierre Schoonbrood; Sophy Stoenner; Simon Voelker; Jan Borchers
CutCAD – An Open-source Tool to Design 3D Objects in 2D Konferenzbeitrag
In: DIS ’18: Proceedings of the 2018 Conference on Designing Interactive Systems, ACM, Hongkong, 2018.
@inproceedings{heller2018a,
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Christian Cherek; Anke Brocker; Simon Voelker; Jan Borchers
Tangible Awareness: How Tangibles on Tabletops Influence Awareness of Each Other’s Actions Konferenzbeitrag
In: Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems, S. 298:1–298:7, ACM, Montreal, Canada, 2018, ISBN: 978-1-4503-5620-6.
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2017
Christian Corsten; Simon Voelker; Jan Borchers
Release, Don’t Wait! Reliable Force Input Confirmation with Quick Release Konferenzbeitrag
In: Proceedings of the 2017 ISS Conference on Interactive Surfaces and Spaces, S. 246–251, ACM, New York, NY, USA, 2017.
@inproceedings{corsten2017b,
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Christian Corsten; Bjoern Daehlmann; Simon Voelker; Jan Borchers
BackXPress: Using Back-of-Device Finger Pressure to Augment Touchscreen Input on Smartphones Konferenzbeitrag
In: Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems, S. 4654–4666, ACM, New York, NY, USA, 2017.
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2016
Simon Voelker
Towards Interactive Desk Workspaces Promotionsarbeit
RWTH Aachen University, 2016.
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2015
Simon Voelker; Christian Cherek; Jan Thar; Thorsten Karrer; Christian Thoresen; Kjell Ivar Øvergård; Jan Borchers
PERCs: Persistently Trackable Tangibles on Capacitive Multi-Touch Displays Konferenzbeitrag
In: UIST ’15: Proceedings of the 28th Annual ACM Symposium on User Interface Software and Technology, S. 351-356, ACM, Charlotte, NC, USA, 2015.
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Simon Voelker; Kjell Ivar Øvergård; Chat Wacharamanotham; Jan Borchers
Knobology Revisited: A Comparison of User Performance between Tangible and Virtual Rotary Knobs Konferenzbeitrag
In: ITS ’15: Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces, S. 35–38, ACM, Maderia, Portugal, 2015.
@inproceedings{voelker2015c,
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Christian Cherek; Simon Voelker; Jan Thar; Rene Linden; Florian Busch; Jan Borchers
PERCs Demo: Persistently Trackable Tangibles on Capacitive Multi-Touch Displays Konferenzbeitrag
In: Proceedings of the 2015 International Conference on Interactive Tabletops and Surfaces, S. 389–392, ACM, Maderia, Portugal, 2015.
@inproceedings{cherek2015a,
title = {PERCs Demo: Persistently Trackable Tangibles on Capacitive Multi-Touch Displays},
author = {Christian Cherek and Simon Voelker and Jan Thar and Rene Linden and Florian Busch and Jan Borchers},
year = {2015},
date = {2015-11-01},
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Simon Voelker; Andrii Matviienko; Johannes Schöning; Jan Borchers
Combining Direct and Indirect Touch Input for Interactive Desktop Workspaces using Gaze Input Konferenzbeitrag
In: Proceedings of the 3rd ACM Symposium on Spatial User Interaction, S. 79–88, ACM, Los Angeles, CA, USA, 2015, (SUI 2015 Best Paper Awards Honorable Mention).
@inproceedings{voelker2015a,
title = {Combining Direct and Indirect Touch Input for Interactive Desktop Workspaces using Gaze Input},
author = {Simon Voelker and Andrii Matviienko and Johannes Sch\"{o}ning and Jan Borchers},
year = {2015},
date = {2015-08-01},
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Florian Heller; Simon Voelker; Chat Wacharamanotham; Jan Borchers
Transporters: Vision & Touch Transitive Widgets for Capacitive Screens Konferenzbeitrag
In: CHI ’15: Extended Abstracts of the SIGCHI Conference on Human Factors in Computing Systems, S. 1603–1608, Seoul, Republic of Korea, 2015, ISBN: 978-1-4503-3146-3.
@inproceedings{heller2015b,
title = {Transporters: Vision \& Touch Transitive Widgets for Capacitive Screens},
author = {Florian Heller and Simon Voelker and Chat Wacharamanotham and Jan Borchers},
url = {http://dx.doi.org/10.1145/2702613.2732707},
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pages = {1603--1608},
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2014
Simon Voelker; Christian Corsten; Nur Al-huda Hamdan; Kjell Ivar Øvergård; Jan Borchers
An Interaction Model for Grasp-Aware Tangibles on Interactive Surfaces Konferenzbeitrag
In: ITS ’14: Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces, S. 279–282, ACM, Dresden, Germany, 2014, ISBN: 978-1-4503-2587-5.
@inproceedings{voelker2014b,
title = {An Interaction Model for Grasp-Aware Tangibles on Interactive Surfaces},
author = {Simon Voelker and Christian Corsten and Nur Al-huda Hamdan and Kjell Ivar \Overgr{a}rd and Jan Borchers},
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Simon Voelker; Christian Corsten; Nur Al-huda Hamdan; Kjell Ivar Øvergård; Jan Borchers
An Interaction Model for Touch-Aware Tangibles on Interactive Surfaces Konferenzbeitrag
In: CHI ’14: Extended Abstracts of the 2014 ACM Conference on Human Factors in Computing Systems, 2014, ISBN: 978-1-4503-2474-8.
@inproceedings{voelker2014a,
title = {An Interaction Model for Touch-Aware Tangibles on Interactive Surfaces},
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Jan Borchers; Christian Corsten; Max Möllers; Simon Voelker
Von der Fläche zur Kurve: Multi-Touch auf beliebigen Oberflächen und Objekten Buchkapitel mit eigenem Titel
In: Multi-Touch: Interaktion durch Berührung, S. 369–392, Springer Verlag, 2014, ISBN: 978-3-642-36113-5.
@incollection{borchers2014a,
title = {Von der Fl\"{a}che zur Kurve: Multi-Touch auf beliebigen Oberfl\"{a}chen und Objekten},
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date = {2014-02-01},
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Kosuke Nakajima; Yuichi Itoh; Simon Voelker; Christian Thoresen; Kjell Ivar Øvergård; Jan Borchers
PUCs: Detecting Transparent, Passive Untouched Capacitive Widgets on Unmodified Multi-touch Displays Konferenzbeitrag
In: Proc. IPSJ Interaction ’14: Proceedings of the Conference on Information Processing Society of Japan, S. 108–113, Information Processing Society of Japan, 2014.
@inproceedings{nakajima2014a,
title = {PUCs: Detecting Transparent, Passive Untouched Capacitive Widgets on Unmodified Multi-touch Displays},
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2013
Fabian Hennecke; Simon Voelker; Maximilian Schenk; Hauke Schaper; Jan Borchers; Andreas Butz
PerspectiveTable: Blending Physical and Virtual Collaborative Workspaces Konferenzbeitrag
In: Workshop on Blending Interaction, Paris, France, 2013.
@inproceedings{hennecke2013a,
title = {PerspectiveTable: Blending Physical and Virtual Collaborative Workspaces},
author = {Fabian Hennecke and Simon Voelker and Maximilian Schenk and Hauke Schaper and Jan Borchers and Andreas Butz},
year = {2013},
date = {2013-04-01},
booktitle = {Workshop on Blending Interaction},
address = {Paris, France},
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}
Simon Voelker; Chat Wacharamanotham; Jan Borchers
An Evaluation of State Switching Methods for Indirect Touch Systems Konferenzbeitrag
In: CHI ’13: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, S. 745–754, ACM, Paris, France, 2013, ISBN: 978-1-4503-1899-0.
@inproceedings{voelker2013a,
title = {An Evaluation of State Switching Methods for Indirect Touch Systems},
author = {Simon Voelker and Chat Wacharamanotham and Jan Borchers},
url = {http://doi.acm.org/10.1145/2470654.2470759},
doi = {10.1145/2470654.2470759},
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year = {2013},
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Simon Voelker; Kosuke Nakajima; Christian Thoresen; Yuichi Itoh; Kjell Ivar Øvergård; Jan Borchers
PUCs: Detecting Transparent, Passive Untouched Capacitive Widgets on Unmodified Multi-touch Displays Konferenzbeitrag
In: ITS ’13: Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces, S. 101–104, ACM, St.~Andrews, Scotland,United Kingdom, 2013, ISBN: 978-1-4503-2271-3.
@inproceedings{voelker2013d,
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Simon Voelker; Kosuke Nakajima; Christian Thoresen; Yuichi Itoh; Kjell Ivar Øvergård; Jan Borchers
PUCs Demo: Detecting Transparent, Passive Untouched Capacitive Widgets on Unmodified Multi-touch Displays Konferenzbeitrag
In: UIST EA ’13: Extended Abstracts of the ACM Symposium on User Interface Software and Technology, S. 1–2, ACM, St.~Andrews, Scotland, United Kingdom, 2013, ISBN: 978-1-4503-2406-9.
@inproceedings{voelker2013c,
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Simon Voelker; Kosuke Nakajima; Christian Thoresen; Yuichi Itoh; Kjell Ivar Øvergård; Jan Borchers
PUCs Demo: Detecting Transparent, Passive Untouched Capacitive Widgets Konferenzbeitrag
In: ITS EA ’13: Extended Abstracts of the ITS ’13: Proceedings of the 2013 ACM International Conference on Interactive Tabletops and Surfaces, S. 325–328, ACM, St.~Andrews, Scotland, United Kingdom, 2013.
@inproceedings{voelker2013b,
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Fabian Hennecke; Simon Voelker; Maximilian Schenk; Hauke Schaper; Jan Borchers; Andreas Butz
Simplifying Remote Collaboration Through Spatial Mirroring Konferenzbeitrag
In: INTERACT ’13: Proceedings of the 14th IFIP TC13 Conference on Human-Computer Interaction, S. 624-631, Springer Berlin Heidelberg, 2013, ISBN: 978-3-642-40476-4.
@inproceedings{hennecke2013b,
title = {Simplifying Remote Collaboration Through Spatial Mirroring},
author = {Fabian Hennecke and Simon Voelker and Maximilian Schenk and Hauke Schaper and Jan Borchers and Andreas Butz},
url = {http://dx.doi.org/10.1007/978-3-642-40477-1_41},
doi = {10.1007/978-3-642-40477-1_41},
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Nur Al-huda Hamdan; Simon Voelker; Jan Borchers
Conceptual Framework for Surface Manager on Interactive Tabletops Konferenzbeitrag
In: Extended Abstracts of the 2013 CHI Conference on Human Factors in Computing Systems, S. 1527–1532, ACM, Paris, France, 2013, ISBN: 978-1-4503-1952-2.
@inproceedings{hamdan2013a,
title = {Conceptual Framework for Surface Manager on Interactive Tabletops},
author = {Nur Al-huda Hamdan and Simon Voelker and Jan Borchers},
doi = {10.1145/2468356.2468629},
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2012
Simon Voelker; Christine Sutter; Lei Wang; Jan Borchers
Understanding Flicking on Curved Surfaces Konferenzbeitrag
In: CHI ’12: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, S. 189–198, ACM, Austin, Texas, USA, 2012, ISBN: 978-1-4503-1015-4.
@inproceedings{voelker2012a,
title = {Understanding Flicking on Curved Surfaces},
author = {Simon Voelker and Christine Sutter and Lei Wang and Jan Borchers},
url = {http://doi.acm.org/10.1145/2207676.2207703},
doi = {10.1145/2207676.2207703},
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}
2011

Malte Weiss; Chat Wacharamanotham; Simon Voelker; Jan Borchers
FingerFlux: Near-surface Haptic Feedback on Tabletops Konferenzbeitrag
In: UIST ’11: Proceedings of the 24th annual ACM symposium on User interface software and technology, S. 615–620, ACM Press, New York, NY, USA, 2011, ISBN: 978-1-4503-0716-1.
@inproceedings{weiss2011b,
title = {FingerFlux: Near-surface Haptic Feedback on Tabletops},
author = {Malte Weiss and Chat Wacharamanotham and Simon Voelker and Jan Borchers},
doi = {10.1145/2047196.2047277},
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Simon Voelker; Malte Weiss; Chat Wacharamanotham; Jan Borchers
Dynamic Portals: A Lightweight Metaphor for Fast Object Transfer on Interactive Surfaces Konferenzbeitrag
In: ITS ’11: Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces, S. 158–161, ACM Press, New York, NY, USA, 2011, ISBN: 978-1-4503-0871-7, (ITS 2011 Best Note Award).
@inproceedings{voelker2011a,
title = {Dynamic Portals: A Lightweight Metaphor for Fast Object Transfer on Interactive Surfaces},
author = {Simon Voelker and Malte Weiss and Chat Wacharamanotham and Jan Borchers},
doi = {10.1145/2076354.2076384},
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2010

Malte Weiss; Simon Voelker; Jan Borchers
The BendDesk Demo – Multi-touch on a Curved Display Konferenzbeitrag
In: ITS ’10: Adjunct Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces, S. 317, ACM, Saarbrücken, Germany, 2010, ISBN: 978-1-4503-0399-6.
@inproceedings{weiss2010e,
title = {The BendDesk Demo - Multi-touch on a Curved Display},
author = {Malte Weiss and Simon Voelker and Jan Borchers},
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address = {Saarbr\"{u}cken, Germany},
abstract = {BendDesk is a curved interactive display that merges a vertical and a horizontal multi-touch surface with a curve. Users sitting at the table can perform multi-touch input on the entire surface. This demo shows the capabilities and potential applications of such a setup. We also present Bend Invaders, one of the first arcade games on a curved interactive surface. Our demo intends to encourage the discussion about the future of multi-touch in desk environments.},
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Malte Weiss; Simon Voelker; Christine Sutter; Jan Borchers
BendDesk: Dragging Across the Curve Konferenzbeitrag
In: ITS ’10: Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces, S. 1–10, ACM, Saarbrücken, Germany, 2010, ISBN: 978-1-4503-0399-6.
@inproceedings{weiss2010d,
title = {BendDesk: Dragging Across the Curve},
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abstract = {We present BendDesk, a hybrid interactive desk system that combines a horizontal and a vertical interactive surface via a curve. The system provides seamless touch input across its entire area. We explain scalable algorithms that provide graphical output and multi-touch input on a curved surface. In four user studies, we investigate the performance of dragging gestures across the curve, as well as the perception of lines on the surface. Our main findings are: 1) Dragging across a curve is significantly slower than on flat surfaces. 2) The flatter the angle when dragging across the curve, the longer the average trajectory and the higher the variance of trajectories across users. 3) The curved shape of the system impairs the perception of lines crossing both surfaces.},
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Simon Voelker
BendDesk: Seamless Integration of Horizontal and Vertical Multi-Touch Surfaces in Desk Environments Abschlussarbeit
RWTH Aachen University, Aachen, 2010.
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2009

Malte Weiss; Simon Voelker; Jan Borchers
BendDesk: Seamless Integration of Horizontal and Vertical Multi-Touch Surfaces in Desk Environments Konferenzbeitrag
In: Adjunct Proceedings ITS ’09. ACM, ACM, Banff, Alberta, Canada, 2009, ISBN: 978-1-60558-733-2.
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