Article
Refine
Year of publication
Institute
- Fachbereich Elektrotechnik und Informationstechnik (631) (remove)
Document Type
- Article (631) (remove)
Keywords
- Multimediamarkt (6)
- Hot S-parameter (2)
- Literaturanalyse (2)
- MINLP (2)
- Referenzmodellierung (2)
- 197m/gHg (1)
- 3-D printing (1)
- Anwendungsorientierter Forschungsansatz (1)
- Arbeit 4.0 (1)
- Automated driving (1)
- Automotive application (1)
- Benchmark (1)
- Bloom’s Taxonomy (1)
- Booster Stations (1)
- Buffering Capacity (1)
- CAV (1)
- CO2 (1)
- Cardiovascular Magnetic Resonance (1)
- Chance Constraint (1)
- Chaostheorie (1)
- Chatbots (1)
- Circuit simulation (1)
- Competence Developing Games (1)
- Content Management (1)
- Design Science Research (1)
- Digitalisierung (1)
- E-Learning (1)
- EBSCO Discovery Service (1)
- EGG (1)
- Energy-efficient ventilation (1)
- Engineering Application (1)
- Enhanced Telecom Operations Map (1)
- Experimental validation (1)
- Forschungsprozess (1)
- Furnace (1)
- Fusion (1)
- Game-based learning (1)
- Gold nanoparticle (AuNP) (1)
- High field MRI (1)
- IBM Watson Explorer (1)
- IP-based networks (1)
- IT security education (1)
- Image Quality Assessment (1)
- Image Quality Score (1)
- Indoor air quality (1)
- Indoor environmental quality (1)
- Interval Time Series (1)
- Keyword analysis (1)
- Larynx position (1)
- Li7La3Zr2O12 (1)
- LiDAR (1)
- LiGaO2 (1)
- Lidar (1)
- Literaturrecherche (1)
- MILP (1)
- MPEG 4 (1)
- MPEG 7 (1)
- MPEG-Standard (1)
- MR safety (1)
- MRI (1)
- Magneto alert sensor (1)
- Meitner-Auger-electron (MAE) (1)
- Mode converter (1)
- Modeling (1)
- Multimedia-Dienst (1)
- NGN (1)
- PM2.5 (1)
- Plasma (1)
- Plasma diagnostics (1)
- Powertrain (1)
- Praxisprojekte (1)
- Process virtualization (1)
- Product bundling (1)
- Prozessabläufe (1)
- Prozessautomatisierung (1)
- Prozessmodellierung (1)
- Prozessstandardisierung (1)
- Pump System (1)
- Pumping systems (1)
- RANSAC (1)
- Radar (1)
- Robotic Process Automation (1)
- Rotary encoder (1)
- Self-driving (1)
- Services (1)
- Sound Pressure Level (1)
- Stochastic Programming (1)
- Targeted radionuclide therapy (TRT) (1)
- Technical Operations Research (1)
- Telecommunication (1)
- Text Analytics (1)
- Text Analytics (1)
- Text Mining (1)
- Tomography (1)
- Transfer impedance (1)
- Transformation (1)
- Uktrahigh field MRI (1)
- Uncertainty (1)
- VOP compression (1)
- Voice assessment (1)
- Water Distribution (1)
- Water Supply Networks (1)
- Wiegand sensor (1)
- automated parking (1)
- automated vehicles (1)
- availability (1)
- batteries and fuel cells (1)
- body imaging at 7 T MRI (1)
- body imaging at UHF MRI (1)
- connected automated vehicles (1)
- design of technical systems (1)
- eTOM (1)
- electrospinning (1)
- energy efficiency (1)
- energy transfer (1)
- experimental evaluation (1)
- fibers (1)
- ga-doping (1)
- garnet solid electrolyte (1)
- genetic algorithm (1)
- global optimization (1)
- harmonic radar (1)
- harmonic radar tags (1)
- heating system (1)
- ignition (1)
- integrated transmit coil arrays (1)
- irradiation (1)
- legal obligations (1)
- line detection (1)
- mathematical optimization (1)
- microplasma (1)
- microwave (MW) plasma (1)
- microwave measurements (1)
- mixed-integer linear programming (1)
- next generation network (1)
- nonlinear VNA measurements (1)
- optimization (1)
- parking slot detection (1)
- plasma jet (1)
- point cloud processing (1)
- porous materials (1)
- product bundling (1)
- product liability (1)
- programming (1)
- remote sensing (1)
- resilience (1)
- slum classification (1)
- solid-state battery (1)
- stochastic optimization (1)
- sustainability (1)
- system optimization (1)
- system synthesis (1)
- technical operations research (1)
- telecommunication (1)
- thermal dose (1)
- tissue temperature (1)
- transmit antenna arrays (1)
- water supply design (1)
Purpose
To calculate local specific absorption rate (SAR) correctly, both the amplitude and phase of the signal in each transmit channel have to be known. In this work, we propose a method to derive a conservative upper bound for the local SAR, with a reasonable safety margin without knowledge of the transmit phases of the channels.
Methods
The proposed method uses virtual observation points (VOPs). Correction factors are calculated for each set of VOPs that prevent underestimation of local SAR when the VOPs are applied with the correct amplitudes but fixed phases.
Results
The proposed method proved to be superior to the worst-case calculation based on the maximum eigenvalue of the VOPs. The mean overestimation for six coil setups could be reduced, whereas no underestimation of the maximum local SAR occurred. In the best investigated case, the overestimation could be reduced from a factor of 3.3 to a factor of 1.7.
Conclusion
The upper bound for the local SAR calculated with the proposed method allows a fast estimation of the local SAR based on power measurements in the transmit channels and facilitates SAR monitoring in systems that do not have the capability to monitor transmit phases
SAR Simulations & Safety
(2017)
This summer, RoboCup competitions were held for the 20th time in Leipzig, Germany. It was the second time that RoboCup took place in Germany, 10 years after the 2006 RoboCup in Bremen. In this article, we give an overview on the latest developments of RoboCup and what happened in the different leagues over the last decade. With its 20th edition, RoboCup clearly is a success story and a role model for robotics competitions. From our personal view point, we acknowledge this by giving a retrospection about what makes RoboCup such a success.
Robots are widely used as a vehicle to spark interest in science and technology in learners. A number of initiatives focus on this issue, for instance, the Roberta Initiative, the FIRST Lego League, the World Robot Olympiad and RoboCup Junior. Robotic competitions are valuable not only for school learners but also for university students, as the RoboCup initiative shows. Besides technical skills, the students get some project exposure and experience what it means to finish their tasks on time. But qualifying students for future high-tech areas should not only be for students from developed countries. In this article, we present our experiences with research and education in robotics within the RoboCup initiative, in Germany and South Africa; we report on our experiences with trying to get the RoboCup initiative in South Africa going. RoboCup has a huge support base of academic institutions in Germany; this is not the case in South Africa. We present our ‘north–south’ collaboration initiatives in RoboCup between Germany and South Africa and discuss some of the reasons why we think it is harder to run RoboCup in South Africa.
Today, the assembly of laser systems requires a large share of manual operations due to its complexity regarding the optimal alignment of optics. Although the feasibility of automated alignment of laser optics has been shown in research labs, the development effort for the automation of assembly does not meet economic requirements – especially for low-volume laser production. This paper presents a model-based and sensor-integrated assembly execution approach for flexible assembly cells consisting of a macro-positioner covering a large workspace and a compact micromanipulator with camera attached to the positioner. In order to make full use of available models from computer-aided design (CAD) and optical simulation, sensor systems at different levels of accuracy are used for matching perceived information with model data. This approach is named "chain of refined perception", and it allows for automated planning of complex assembly tasks along all major phases of assembly such as collision-free path planning, part feeding, and active and passive alignment. The focus of the paper is put on the in-process image-based metrology and information extraction used for identifying and calibrating local coordinate systems as well as the exploitation of that information for a part feeding process for micro-optics. Results will be presented regarding the processes of automated calibration of the robot camera as well as the local coordinate systems of part feeding area and robot base.
Ground or aerial robots equipped with advanced sensing technologies, such as three-dimensional laser scanners and advanced mapping algorithms, are deemed useful as a supporting technology for first responders. A great deal of excellent research in the field exists, but practical applications at real disaster sites are scarce. Many projects concentrate on equipping robots with advanced capabilities, such as autonomous exploration or object manipulation. In spite of this, realistic application areas for such robots are limited to teleoperated reconnaissance or search. In this paper, we investigate how well state-of-the-art and off-the-shelf components and algorithms are suited for reconnaissance in current disaster-relief scenarios. The basic idea is to make use of some of the most common sensors and deploy some widely used algorithms in a disaster situation, and to evaluate how well the components work for these scenarios. We acquired the sensor data from two field experiments, one from a disaster-relief operation in a motorway tunnel, and one from a mapping experiment in a partly closed down motorway tunnel. Based on these data, which we make publicly available, we evaluate state-of-the-art and off-the-shelf mapping approaches. In our analysis, we integrate opinions and replies from first responders as well as from some algorithm developers on the usefulness of the data and the limitations of the deployed approaches, respectively. We discuss the lessons we learned during the two missions. These lessons are interesting for the community working in similar areas of urban search and rescue, particularly reconnaissance and search.
Absatzkanäle kaum verknüpft
(2011)
Das von Texas-Instruments (TI) vertriebene Interface CBL2 wird über einige TI-Grafik-Rechner (TI-92, TI-89 usw.) angesteuert. Wegen seiner Handlichkeit wird dieses System beim Unterricht in wechselnden Räumen »großen« Messwerterfassungssystemen oft vorgezogen. Das CBL2 bietet drei analoge Eingänge, die immerhin mit 10 Bit Auflösung und bis zu einer Frequenz von 50 kHz arbeiten. Weiterhin besitzt das CBL2 eine Buchse für angeblich nur einen digitalen Ein- bzw. Ausgang. An diesem Eingang wird standardmäßig hauptsächlich der Bewegungssensor CBR betrieben. In diesem Beitrag werden Erweiterungsmöglichkeiten dieses Anschlusses beschrieben.
Wir stellen einen USB-Baustein vor, der eine kostengünstige und universelle Möglichkeit schafft , im Unterricht den Themenkreis Messen-Steuern-Regeln zu behandeln. Die Funktionalität orientiert sich am CVK-Interface der Firma Fischertechnik. Im Gegensatz zu kommerziellen Lösungen erlaubt unser Aufbau auch den preiswerten Einsatz in Gruppen- oder Einzelarbeit. Abschließend berichten wir über ein Beispiel aus dem Unterrichtseinsatz.
This paper presents the latest prototype of the integrated emitter turn-off thyristor concept, which potentially ranks among thyristor high-power devices like the gate turn-off thyristor and the integrated gate-commutated thyristor (IGCT). Due to modifications of the external driver stage and mechanical press-pack design optimization, this prototype allows for full device characterization. The turn-off capability was increased to 1600 A with an active silicon area of 823mm2 . This leads to a transient peak power of 672.1kW/cm² . Within this paper, measurements and concept assessment are presented and a comparison to state-of-the-art IGCT devices is provided.