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Extremum Seeking Control for Beam Steering using Hypersurfaces

Extremum Seeking Control for Beam Steering using Hypersurfac...

引用

IEEE International Conference on Communications Workshops, ICC

作者： Nouman Ashraf Marios Lestas Taqwa Saeed Hamidreza Taghvaee Sergi Abadal Andreas Pitsillides Christos Liaskos Dep. of Electrical Engineering Frederick University Dep. of Computer Science University of Cyprus Nicosia Cyprus Dep. of Computer Architecture Universitat Politècnica de Catalunya Barcelona Spain Institute of Computer Science Foundation of Research and Technology Hellas Heraklion Greece

ISBN: (数字)9781728174402

ISBN: (纸本)9781728174419

Hypersurface, a software defined metasurface (SDM) paradigm constitutes a revolutionary technology aiming at offering programmatic control over all aspects of a propagating wave, altering its direction, power, polarization and phase. In the absence of line of sight (LOS) between a transmitter and a receiver, HSF can provide seamless connectivity via programmatic reflection. However, such an application requires fine tuning of the metasurface reconfiguration parameters, which may not be effective when done in an open loop fashion due to model uncertainties. In this work, we consider a feedback-based formulation of the problem, which involves maximization of the received power and propose the use of Extremum Seeking Control (ESC) for the controller implementation due to fact that it is model-free and adheres to the maximization problem. Extensive simulations indicate that the proposed scheme is successful in guiding the impinging wave to the receiver within reasonable time even in the presence of time varying delays incurred by message propagation. In addition, a discrete time implementation is considered, investigating its limitations as we increase the sampling time while also characterizing the traffic within the controller network.

关键词： Receivers Beam steering Transmitters Aerospace electronics computer science Software Delays

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When Do Neuromorphic Sensors Outperform cameras? Learning from Dynamic Features

When Do Neuromorphic Sensors Outperform cameras? Learning fr...

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Annual Conference on Information Sciences and Systems (CISS)

作者： Daniel Deniz Eduardo Ros Cornelia Fermller Francisco Barranco Dep. of Computer Architecture and Technology University of Granada Spain Perception and Robotics Group University of Maryland USA

Visual event sensors only output data when changes in the scene happen at very high frequency. This allows for smartly compressing the scene and thus, enabling real-time operation. Despite these advantages, works in the literature have struggled to show a niche for these event-driven approaches compared to conventional sensors, especially when focusing on accuracy performance. In this work, we show a case that fully exploits event sensor advantages: for manipulation action recognition, learning events achieves superior accuracy and time performance. The recognition of manipulation actions requires extracting and learning features from the hand pose and trajectory and the interaction with the object. As shown in our work, approaches based on event sensors are the best fit for extracting these dynamic features contrarily to conventional approaches based on full frames, which mostly extract spatial features and need to reconstruct the dynamics from sequences of frames. Finally, we show how using a tracker to extract the features to be learned only around the hand, we obtain an approach that is scene- and almost object-agnostic and achieves good time performance with a very limited impact in accuracy.

关键词： Visualization Neuromorphics Neural networks Human-robot interaction Sensor phenomena and characterization Feature extraction Real-time systems

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Evaluation of Interconnection Networks Using Full-System Simulators: Lessons Learned

Evaluation of Interconnection Networks Using Full-System Sim...

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Annual Symposium on Simulation

作者： Javier Navaridas Fco. Javier Ridruejo Jose Miguel-Alonso Dep. of Computer Architecture and Technology University of Basque Country (UPV-EHU) Donostia San Sebastian Spain

In this paper we show the difficulties encountered when performing full system simulation of a distributed memory parallel system. To illustrate the problem, we have chosen a workbench that evaluates the impact on application performance of some simple congestion-control mechanism that can be implemented in the interconnection network. Applications of choice are some of those included in the NAS parallel benchmarks. Running a full-system, execution-driven simulation that combines Simics with an interconnection network simulator, we observe some unexpected, negative interactions of overlapping congestion control techniques implemented at the network level and at the host level. Each MPI implementation uses a different protocol stack, and some of them work without TCP. We compare and contrast results obtained with MPICH, LA-MPI and LAM

关键词： Multiprocessor interconnection networks Storage area networks Economic indicators

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Improving performance of all-to-all communication through loop scheduling in PGAS environments 13

Improving performance of all-to-all communication through lo...

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27th ACM International Conference on Supercomputing, ICS 2013

作者： Alvanos, Michail Tanase, Gabriel Farreras, Montse Tiotto, Ettore Amaral, José Nelson Martorell, Xavier Programming Models Barcelona Supercomputer Center Barcelona Spain IBM TJ Watson Research Center Yorktown Heights NY United States Dep. of Computer Architecture Universitat Politècnica de Catalunya Barcelona Spain Static Compilation Technology IBM Toronto Laboratory Toronto ON Canada Dep. of Computing Science University of Alberta Edmonton AB Canada IBM Canada CAS Research Markham ON Canada

No abstract available.

ISBN: (纸本)9781450321303

No abstract available.

关键词： unified parallel c partitioned global address space performance evaluation one-sided communication

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A mobile memory game for patients with Acquired Brain Damage: A preliminary usability study

A mobile memory game for patients with Acquired Brain Damage...

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IEEE EMBS International Conference on Information technology Applications in Biomedicine (ITAB)

作者： M. J. Morón R. Yáñez D. Cascado C. Suárez-Mejías J. L. Sevillano Electronics Technology Dep. Universidad de Sevilla Sevilla Spain Computer Architecture and Technology Dep. Universidad de Sevilla Sevilla Spain UCAi Virgen del Rocio University Hospital Seville Spain

Memory rehabilitation and training is an important activity for patients with Acquired Brain Damage, including Cerebral Vascular Accident (stroke) and Traumatic Brain Injury patients. Although many interactive web-based and computer applications have been developed, the use of mobile devices apps has not been sufficiently studied from the point of view of its usability for these users. In this paper, a preliminary usability and accessibility study of a memory game for mobile devices (developed from scratch under Android OS) is presented. This study, based on the Shadow Expert Technique, allows improving the prototype and provides useful hints for increasing acceptability of Android applications, not only by Acquired Brain Damage patients but also by other people with cognitive disorders.

关键词： Games Usability Prototypes Androids Humanoid robots Training Diseases

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A novel policy to reduce the electrical cost of a real time control process using an on-line Adaptive Fuzzy Logic Controller

A novel policy to reduce the electrical cost of a real time ...

引用

IEEE International Conference on Multimedia Computing and Systems (ICMCS)

作者： Rafik Lasri Ignacio Rojas Héctor Pomares Dep. Computer Architecture & Computer Technology E.T.S. Ing. Informática & Telecomunicación - Univ. of Granada Periodista Daniel Saucedo Aranda GRANADA (SPAIN)

ISBN: (纸本)9781467315180

With a very limited knowledge of the plant (delay and monotonicity sign) and without any kind of off-line pre-training, a Self-Organizing and Adaptive Fuzzy Logic Controller is developed to reduce the energy consumption during a control process. Our on-line adaptive controller is able to modify and to adapt the rule base of the system by learning from the real behavior of the plant. A comparison results - based on the real electrical consumption - between several conventional control algorithms and the adaptive one is presented, this latter has been able to provide a quite interesting output signal that optimizes the energy consumption without losing the control performance.

关键词： Process control Temperature control Fuzzy logic Intelligent control System-on-a-chip Tuning

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Determinants of Electric Vehicle Adoption and Integration with Public Transportation through Park-and-Ride

Determinants of Electric Vehicle Adoption and Integration wi...

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International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Mulham Fawakherji Driss Benhaddou Bruce Race Bryan. Carrollia Wilfredo. Santamaria Dep. Computer Engineering Technology University of Houston Houston USA Dep. of Electrical Engineering College of Engineering Alfaisal University Riyadh SA College of Architecture and Design University of Houston Houston USA Metropolitan Transit Authority of Harris County Houston USA

The rise of Electric Vehicles (EVs) has presented a promising solution to the environmental and resource challenges posed by conventional combustion engine vehicles. With their potential to significantly reduce greenhouse gas emissions and enhance air quality, the adoption of EVs is essential for a more sustainable future. However, despite their benefits, widespread adoption remains limited. Thus, understanding the key factors that impact consumer adoption is crucial for promoting their use. This study aims to identify and analyze the various determinants that influence EV adoption, including social and demographic, political, economic, technological, and environmental factors. The findings offer valuable insights into the most significant barriers to EV adoption and provide potential strategies to encourage their use. Furthermore, this study examines the feasibility and sustainability of integrating EVs with public transportation via park-and-ride stations, emphasizing the importance of promoting sustainable transportation given the continued reliance on personal vehicles for park-and-ride travel.

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Comparision of Multi-Carrier Techniques in Seven-Level Asymmetric Cascade Multilevel Inverter

Comparision of Multi-Carrier Techniques in Seven-Level Asymm...

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International Conference on Power Engineering, Energy and Electrical Drives

作者： Ilhami COLAK Ersan KABALCI Gokhan KEVEN Faculty of Technology Department of Electric & Electronic Engineering Gazi University Ankara Turkey Faculty of Engineering & Architecture Dep. of Electrical & Electronic Eng. Nevsehir University Nevsehir Turkey Vocational College of Haci Bekta? Veli Dep. of Computer Programming Nevsehir University Nevsehir Turkey

ISBN: (纸本)9781467363914

The multilevel inverters (MLIs) are classified into three topologies such as Diode Clamped, Flying Capacitor and Cascade Multilevel Inverter (CMLI). CMLI topologies include two kind of structure that is named symmetric and asymmetric topologies. Asymmetric Cascade MLI (ACMLI) topologies consist of unequal DC sources. Many modulation techniques have been used in ACMLI topology such as Multi-Carrier PWM (MC-PWM), Space Vector PWM and Selective Harmonic PWM. The MC-PWM technique is achieved by four different types. In this study, MC-PWM techniques which are named Phase Disposition PWM, Phase Opposition Disposition PWM, Alternate Phase Opposition Disposition PWM and Phase Shifted PWM have been compared. It is uncovered that Phase Opposition Disposition PWM technique is more convenient in terms of Total Harmonic Distortion of output voltage and current signals and in terms of the quality of power factor in ACMLI which is performed in this study.

关键词： asymmetric cascade multilevel inverter multi carrier PWM THD frequency index power factor

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Kinect=IMU? Learning MIMO Signal Mappings to Automatically Translate Activity Recognition Systems across Sensor Modalities

Kinect=IMU? Learning MIMO Signal Mappings to Automatically T...

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International Symposium on Wearable computers

作者： Oresti Banos Alberto Calatroni Miguel Damas Hector Pomares Ignacio Rojas Hesam Sagha Jose del R. Mill´n Gerhard Troster Ricardo Chavarriaga Daniel Roggen ETH Wearable Computing Laboratory Zurich Switzerland CNBI Center for Neuroprosthetics École Polytechnique Fédérale de Lausanne Switzerland CNBI Center for Neuroprosthetics Switzerland Dep. of Computer Architecture and Computer Technology University of Granada Spain

We propose a method to automatically translate a preexisting activity recognition system, devised for a source sensor domain S, so that it can operate on a newly discovered target sensor domain T, possibly of different modality. First, we use MIMO system identification techniques to obtain a function that maps the signals of S to T. This mapping is then used to translate the recognition system across the sensor domains. We demonstrate the approach in a 5-class gesture recognition problem translating between a vision-based skeleton tracking system (Kinect), and inertial measurement units (IMUs). An adequate mapping can be learned in as few as a single gesture (3 seconds) in this scenario. The accuracy after Kinect → IMU or IMU → Kinect translation is 4% below the baseline for the same limb. Translating across modalities and also to an adjacent limb yields an accuracy 8% below baseline. We discuss the sources of errors and means for improvement. The approach is indep.ndent of the sensor modalities. It supports multimodal activity recognition and more flexible real-world activity recognition system dep.oyments.

关键词： Acceleration MIMO Target recognition Accuracy Joints Smart phones Position measurement

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Improving communication in PGAS environments: Static and dynamic coalescing in UPC 13

Improving communication in PGAS environments: Static and dyn...

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27th ACM International Conference on Supercomputing, ICS 2013

作者： Alvanos, Michail Farreras, Montse Tiotto, Ettore Amaral, José Nelson Martorell, Xavier Programming Models Barcelona Supercomputer Center Barcelona Spain Department of Computer Architecture Universitat Politecnica de Catalunya Cr. Jordi Girona 1-3 08034 Barcelona Spain Static Compilation Technology IBM Toronto Laboratory Toronto ON Canada Dep. of Computing Science University of Alberta Edmonton AB Canada Barcelona Supercomputing Center Cr. Jordi Girona 29 08034 Barcelona Spain IBM Canada CAS Research Markham ON Canada

ISBN: (纸本)9781450321303

The goal of Partitioned Global Address Space (PGAS) languages is to improve programmer productivity in large scale parallel machines. However, PGAS programs may have many fine-grained shared accesses that lead to performance degradation. Manual code transformations or compiler optimizations are required to improve the performance of programs with fine-grained accesses. The downside of manual code transformations is the increased program complexity that hinders programmer productivity. On the other hand, most compiler optimizations of fine-grain accesses require knowledge of physical data mapping and the use of parallel loop constructs. This paper presents an optimization for the Unified Parallel C language that combines compile time (static) and runtime (dynamic) coalescing of shared data, without the knowledge of physical data mapping. Larger messages increase the network efficiency and static coalescing decreases the overhead of library calls. The performance evaluation uses two microbenchmarks and three benchmarks to obtain scaling and absolute performance numbers on up to 32768 cores of a Power 775 machine. Our results show that the compiler transformation results in speedups from 1.15X up to 21X compared with the baseline versions and that they achieve up to 63% the performance of the MPI versions. © 2013 ACM.

关键词： Dynamics

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