Publications of Wolfgang Effelsberg
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Artikel
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Thomas Haenselmann, Thomas King, Marcel Busse, Wolfgang Effelsberg und Markus Fuchs.
2007
Skriptbasierte drahtlose Gebäudeautomation mit Sensornetzen
Praxis der Informationsverarbeitung und Kommunikation : PIK, , 1, 163-169
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Stephan Kopf und Wolfgang Effelsberg.
2007
New Teaching and Learning Technologies for Interactive Lectures
Advanced Technology for Learning, 4, 2, 60 - 67
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Matthias Transier, Holger Füßler, Jörg Widmer, Martin Mauve und Wolfgang Effelsberg.
2007
A Hierarchical Approach to Position-Based Multicast for Mobile Ad-hoc Networks
Wireless Networks : WN, 13, 4, 447-460
Konferenz Beitrag
- Marcel Busse, Thomas Haenselmann und Wolfgang Effelsberg. IEEE Computer Soc., 2007 Energy-Efficient Aggregation Forwarding for Wireless Sensor Networks . Piscataway, NJ
- Marcel Busse, Thomas Haenselmann und Wolfgang Effelsberg. IEEE Computer Soc., 2007 Energy-Efficient Data Dissemination for Wireless Sensor Networks . Los Alamitos, Calif. [u.a.]
- Holger Füßler, Sascha Schnaufer, Matthias Transier und Wolfgang Effelsberg. IEEE, 2007 Vehicular Ad-Hoc Networks: From Vision to Reality and Back . Piscataway, NJ
- Thomas Haenselmann, Thomas King, Marcel Busse, Wolfgang Effelsberg und Markus Fuchs. Springer, 2007 Embedded Script-Driven Home-Automation with Sensor Networks IFIP Advances in Information and Communication Technology. New York, NY [u.a.]
- Thomas Haenselmann, Thomas King, Marcel Busse, Wolfgang Effelsberg und Markus Fuchs. Springer, 2007 Scriptable Sensor Network based Home-Automation Lecture Notes in Computer Science. Berlin [u.a.]
- Thomas King, Thomas Butter, Matthias Brantner, Stephan Kopf, Thomas Haenselmann, Alexander Biskop, Andreas Färber und Wolfgang Effelsberg. IEEE Operations Center, 2007 Distribution of Fingerprints for 802.11-based Positioning Systems . Piscataway, NJ [u.a.]
- Thomas King, Thomas Butter, Hendrik Lemelson, Thomas Haenselmann und Wolfgang Effelsberg. ACM Press, 2007 Loc{lib,trace,eva,ana}: Research Tools for 802.11-based Positioning Systems . New York, NY
- Thomas King, Thomas Haenselmann und Wolfgang Effelsberg. Springer , 2007 Deployment, Calibration, and Measurement Factors for Position Errors in 802.11-based Indoor Positioning Systems . Berlin [u.a.]
- Thomas King, Thomas Haenselmann, Stephan Kopf und Wolfgang Effelsberg. IEEE Computer Soc., 2007 Overhearing the Wireless Interface for 802.11-based Positioning Systems . Los Alamitos, Calif. [u.a.]
- Stephan Kopf und Wolfgang Effelsberg. SPIE, 2007 Color Adaptation of Videos for Mobile Devices Proceedings of SPIE. Bellingham, Wash.
- Stephan Kopf, Fleming Lampi, Thomas King, Malte Probst und Wolfgang Effelsberg. Ges. für Informatik, 2007 EDL-Editor: Eine Anwendung zur automatischen Aufbereitung von Vorlesungsvideos GI-Edition : Lecture Notes in Informatics. Proceedings. Bonn
- Fleming Lampi, Stephan Kopf, Manuel Benz und Wolfgang Effelsberg. ACM, 2007 An Automatic Cameraman in a Lecture Recording System . New York, NY
- Fleming Lampi, Stephan Kopf und Wolfgang Effelsberg. AACE , 2007 Automatic FSM-Based Video Directors for Lecture Recording . Chesapeake, Va.
- Hendrik Lemelson, Thomas King, Stephan Kopf und Wolfgang Effelsberg. INSTICC Press, 2007 On the Use of Various Power Levels to Improve Wireless LAN-based Positioning : Using Multiple Power Levels With Fingerprinting Algorithms . [Setúbal]
- Moritz Steiner, Wolfgang Effelsberg, Taoufik En-Najjary und Ernst W. Biersack. Univ., 2007 Load Reduction in the KAD Peer-to-Peer System . Vienna
- Tonio Triebel, Benjamin Guthier und Wolfgang Effelsberg. ACM Press, 2007 Skype4Games ACM Conference Proceedings Series. New York, NY
Forschungs Papier
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Thomas King, Thomas Haenselmann und Wolfgang Effelsberg. ,
Technical Reports. 2007
Key Factors for Position Errors in 802.11-based Positioning Systems
Mannheim, . 07-003
Indoor positioning systems based on 802.11 and fingerprints offer reasonably low position errors. We study the key factors for position errors by systematically investigating (1) the number of access points, (2) the number of samples in the training phase, (3) the number of samples in the position determination phase, and (4) the setup of the grid of reference points. Further, we squeeze out the best of the positioning system by selecting advantageous values for these parameters. For our study, we utilize a test environment with a size of about 312 square meters that is covered with 612 reference points arranged in an equally spaced grid. -
Thomas King, Thomas Haenselmann und Wolfgang Effelsberg. ,
.Praktische Informatik IV, Fakultaet fuer Mathematik und Informatik, Universitaet Mannheim 2007
On-Demand Fingerprint Selection for 802.11-based Positioning Systems
, .
Fingerprinting is a popular technology for 802.11-based positioning systems: Radio characteristics from different access points are measured at various positions and stored in a database. The database is copied to all mobile devices, and when a position is needed, the devices compares its currently measured radio characteristics with the database entries. In this paper, we present two on-demand fingerprint selection algorithms to avoid the cumbersome and time-consuming approach of manually copying all fingerprints. Our algorithms only request those fingerprints from the database that are currently required to compute a position. The two algorithms differ in the way they shape the region for which fingerprints are requested. On-demand selection also allows storage-restricted mobile devices to utilize the positioning system. We carefully evaluate our algorithms in a real-world experiment. The results show that our algorithms do not harm the position accuracy of the positioning system. In addition, we analyze the space requirements of our algorithms and show that the typical constraints of mobile devices are met. -
Thomas King, Hendrik Lemelson, Thomas Haenselmann und Wolfgang Effelsberg. ,
. 2007
Loc{lib,trace,eva,ana}: Research Tools for 802.11-based Positioning Systems
, .
802.11-based positioning systems are a hot topic in research. However, no standardized set of tools has been established to facilitate the researc process. In this paper, we contribute our research tools to the community. The benefit for the community is considerable: (1) Standardized tools reduce the amount of work each researcher has to spend to build software to collect signal strength samples and process this data. (2) The confidence in the correctness of the tools increases because everybody is encouraged to submit bug-fixes. (3) A unified evaluation process makes results mutually comparable. (4) We hope other researchers contribute to our tools.