TY  - JOUR
A1  - Fiedler, Thomas M.
A1  - Orzada, Stephan
A1  - Flöser, Martina
A1  - Rietsch, Stefan H. G.
A1  - Quick, Harald H.
A1  - Ladd, Mark E.
A1  - Bitz, Andreas
T1  - Performance analysis of integrated RF microstrip transmit antenna arrays with high channel count for body imaging at 7 T
JF  - NMR in Biomedicine
N2  - The aim of the current study was to investigate the performance of integrated RF
transmit arrays with high channel count consisting of meander microstrip antennas
for body imaging at 7 T and to optimize the position and number of transmit ele-
ments. RF simulations using multiring antenna arrays placed behind the bore liner
were performed for realistic exposure conditions for body imaging. Simulations were
performed for arrays with as few as eight elements and for arrays with high channel
counts of up to 48 elements. The B1+ field was evaluated regarding the degrees of
freedom for RF shimming in the abdomen. Worst-case specific absorption rate
(SARwc ), SAR overestimation in the matrix compression, the number of virtual obser-
vation points (VOPs) and SAR efficiency were evaluated. Constrained RF shimming
was performed in differently oriented regions of interest in the body, and the devia-
tion from a target B1+ field was evaluated. Results show that integrated multiring
arrays are able to generate homogeneous B1+ field distributions for large FOVs, espe-
cially for coronal/sagittal slices, and thus enable body imaging at 7 T with a clinical
workflow; however, a low duty cycle or a high SAR is required to achieve homoge-
neous B1+ distributions and to exploit the full potential. In conclusion, integrated
arrays allow for high element counts that have high degrees of freedom for the pulse
optimization but also produce high SARwc , which reduces the SAR accuracy in the
VOP compression for low-SAR protocols, leading to a potential reduction in array
performance. Smaller SAR overestimations can increase SAR accuracy, but lead to a
high number of VOPs, which increases the computational cost for VOP evaluation
and makes online SAR monitoring or pulse optimization challenging. Arrays with
interleaved rings showed the best results in the study.
KW  - body imaging at UHF MRI
KW  - integrated transmit coil arrays
KW  - VOP compression
Y1  - 2021
U6  - https://doi.org/10.1002/nbm.4515
SN  - 0952-3480 (ISSN)
SN  - 1099-1492 (eISSN)
VL  - 34
IS  - 7
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - PAT
A1  - Lippoldt, Mario
A1  - Ringbeck, Thorsten
A1  - Hüning, Felix
T1  - Verfahren und System zur Erkennung von unerlaubten Fahrzeug-Überholvorgängen in einer Überholverbotszone eines Fahrwegs
Y1  - 2023
ER  - 
TY  - JOUR
A1  - Kowalewski, Paul
A1  - Bragard, Michael
A1  - Hüning, Felix
A1  - De Doncker, Rik W.
T1  - An inexpensive Wiegand-sensor-based rotary encoder without rotating magnets for use in electrical drives
JF  - IEEE Transactions on Instrumentation and Measurement
N2  - This paper introduces an inexpensive Wiegand-sensor-based rotary encoder that avoids rotating magnets and is suitable for electrical-drive applications. So far, Wiegand-sensor-based encoders usually include a magnetic pole wheel with rotating permanent magnets. These encoders combine the disadvantages of an increased magnet demand and a limited maximal speed due to the centripetal force acting on the rotating magnets. The proposed approach reduces the total demand of permanent magnets drastically. Moreover, the rotating part is manufacturable from a single piece of steel, which makes it very robust and cheap. This work presents the theoretical operating principle of the proposed approach and validates its benefits on a hardware prototype. The presented proof-of-concept prototype achieves a mechanical resolution of 4.5 ° by using only 4 permanent magnets, 2Wiegand sensors and a rotating steel gear wheel with 20 teeth.
KW  - Rotary encoder
KW  - Wiegand sensor
Y1  - 2023
U6  - https://doi.org/10.1109/TIM.2023.3326166
SN  - 0018-9456 (Print)
SN  - 1557-9662 (Online)
VL  - 72
SP  - 10 Seiten
PB  - IEEE
CY  - New York
ER  - 
TY  - CHAP
A1  - Walter, Peter
A1  - Elsen, Ingo
A1  - Müller, Holger
A1  - Kraiss, Karl-Friedrich
T1  - 3D object recognition with a specialized mixtures of experts architecture
T2  - IJCNN'99. International Joint Conference on Neural Networks. Proceedings
N2  - Aim of the AXON2 project (Adaptive Expert System for Object Recogniton using Neuml Networks) is the development of an object recognition system (ORS) capable of recognizing isolated 3d objects from arbitrary views. Commonly, classification is based on a single feature extracted from the original image. Here we present an architecture adapted from the Mixtures of Eaqerts algorithm which uses multiple neuml networks to integmte different features. During tmining each neural network specializes in a subset of objects or object views appropriate to the properties of the corresponding feature space. In recognition mode the system dynamically chooses the most relevant features and combines them with maximum eficiency. The remaining less relevant features arz not computed and do therefore not decelerate the-recognition process. Thus, the algorithm is well suited for ml-time applications.
Y1  - 1999
SN  - 0-7803-5529-6
U6  - https://doi.org/10.1109/IJCNN.1999.836243
SN  - 1098-7576
N1  - Washington, DC 10-16.07.1999
SP  - 3563
EP  - 3568
PB  - IEEE
CY  - New York
ER  - 
TY  - JOUR
A1  - Elsen, Ingo
A1  - Kraiss, Karl-Friedrich
T1  - System concept and realization of a scalable neurocomputing architecture
JF  - Systems Analysis Modelling Simulation
N2  - This paper describes the realization of a novel neurocomputer which is based on the concepts of a coprocessor. In contrast to existing neurocomputers the main interest was the realization of a scalable, flexible system, which is capable of computing neural networks of arbitrary topology and scale, with full independence of special hardware from the software's point of view. On the other hand, computational power should be added, whenever needed and flexibly adapted to the requirements of the application. Hardware independence is achieved by a run time system which is capable of using all available computing power, including multiple host CPUs and an arbitrary number of neural coprocessors autonomously. The realization of arbitrary neural topologies is provided through the implementation of the elementary operations which can be found in most neural topologies.
Y1  - 1999
SN  - 0232-9298
SN  - 1029-4902
VL  - 35
IS  - 4
SP  - 399
EP  - 419
PB  - Gordon and Breach Science Publishers
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Elsen, Ingo
A1  - Kraiss, Karl-Friedrich
A1  - Krumbiegel, Dirk
A1  - Walter, Peter
A1  - Wickel, Jochen
T1  - Visual information retrieval for 3D product identification: a midterm report
JF  - KI - Künstliche Intelligenz
Y1  - 1999
SN  - 1610-1987
SN  - 0933-1875
VL  - 13
IS  - 1
SP  - 64
EP  - 67
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Elsen, Ingo
T1  - A pixel based approach to view based object recognition with self-organizing neural networks
T2  - IECON'98. Proceedings of the 24th Annual Conference of the IEEE Industrial Electronics Society
N2  - This paper addresses the pixel based classification of three dimensional objects from arbitrary views. To perform this task a coding strategy, inspired by the biological model of human vision, for pixel data is described. The coding strategy ensures that the input data is invariant against shift, scale and rotation of the object in the input domain. The image data is used as input to a class of self organizing neural networks, the Kohonen-maps or self-organizing feature maps (SOFM). To verify this approach two test sets have been generated: the first set, consisting of artificially generated images, is used to examine the classification properties of the SOFMs; the second test set examines the clustering capabilities of the SOFM when real world image data is applied to the network after it has been preprocessed to be invariant against shift, scale and rotation. It is shown that the clustering capability of the SOFM is strongly dependant on the invariance coding of the images.
Y1  - 1998
SN  - 0-7803-4503-7
U6  - https://doi.org/10.1109/IECON.1998.724032
N1  - Aachen, 31 August 1998 - 04 September 1998
SP  - 2040
EP  - 2044
PB  - IEEE
CY  - New York
ER  - 
TY  - CHAP
A1  - Elsen, Ingo
A1  - Kraiss, Karl-Friedrich
A1  - Krumbiegel, Dirk
T1  - Pixel based 3D object recognition with bidirectional associative memories
T2  - International Conference on Neural Networks 1997
N2  - This paper addresses the pixel based recognition of 3D objects with bidirectional associative memories. Computational power and memory requirements for this approach are identified and compared to the performance of current computer architectures by benchmarking different processors. It is shown, that the performance of special purpose hardware, like neurocomputers, is between one and two orders of magnitude higher than the performance of mainstream hardware. On the other hand, the calculation of small neural networks is performed more efficiently on mainstream processors. Based on these results a novel concept is developed, which is tailored for the efficient calculation of bidirectional associative memories. The computational efficiency is further enhanced by the application of algorithms and storage techniques which are matched to characteristics of the application at hand.
Y1  - 1997
SN  - 0-7803-4122-8
N1  - June 9 - 12, 1997, Westin Galleria Hotel Houston, Texas, USA.
SP  - 1679
EP  - 1684
PB  - IEEE
CY  - New York
ER  - 
TY  - CHAP
A1  - Elsen, Ingo
A1  - Hawari, Asma
A1  - Johnen, Uwe
ED  - Pietsch, Wolfram
ED  - Krams, Benedikt
T1  - Produktkernel in der Systemintegration (Erfahrungsbericht aus der Praxis)
T2  - Vom Projekt zum Produkt - Fachtagung des GI-Fachausschusses Management der Anwendungsentwicklung und -wartung im Fachbereich Wirtschaftsinformatik (WI-MAW), 1. - 3. Dezember 2010 in Aachen
N2  - In der Vergangenheit basierten große Systemintegrationsprojekte in der Regel auf Individualentwicklungen für einzelne Kunden. Getrieben durch Kostendruck steigt aber der Bedarf nach standardisierten Lösungen, die gleichzeitig die individuellen Anforderungen des jeweiligen Umfelds berücksichtigen. T-Systems GEI GmbH wird beiden Anforderungen mit Produktkerneln gerecht. Neben den technischen Aspekten der Kernelentwicklung spielen besonders organisatorische Aspekte eine Rolle, um Kernel effizient und qualitativ hochwertig zu entwickeln, ohne deren Funktionalitäten ins Uferlose wachsen zu lassen. Umgesetzt hat T-Systems dieses Konzept für Flughafeninformationssysteme. Damit kann dem wachsenden Bedarf der Flughafenbetreiber nach einer effizienten und kostengünstigen Softwarelösung zur Unterstützung Ihrer Geschäftsprozesse entsprochen werden.
Y1  - 2010
SN  - 9783885792727
SN  - 1617-5468
SP  - 93
EP  - 102
PB  - Gesellschaft für Informatik eV
CY  - Bonn
ER  - 
TY  - JOUR
A1  - Elsen, Ingo
A1  - Hartung, Frank
A1  - Horn, Uwe
A1  - Kampmann, Markus
A1  - Peters, Liliane
ED  - Voas, Jeffrey
T1  - Streaming technology in 3G mobile communication systems
JF  - Computer : innovative technology for computer professionals
N2  - Third-generation mobile communication systems will combine standardized streaming with a range of unique services to provide high-quality Internet content that meets the specific needs of the rapidly growing mobile market.
Y1  - 2001
SN  - 0018-9162
SN  - 1558-0814
VL  - 34
IS  - 9 Seiten
SP  - 46
EP  - 52
PB  - IEEE
CY  - New York
ER  -