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Towards AER VITE: Building spike gate signal

Towards AER VITE: Building spike gate signal

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2012 19th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2012

作者： Perez-Pena, Fernando Morgado-Estevez, Arturo Rioja-Del-Rio, Carlos Linares-Barranco, Alejandro Jimenez-Fernandez, Angel Lopez-Coronado, Juan Munoz-Lozano, Jose Luis Applied Robotics Lab High School of Engineering University of Cadiz Spain Automatic and System Engineering Department University Polytechnics of Cartagena Spain Department of Computer Architecture and Technology ETSI Computer Science University of Seville Spain

ISBN: (纸本)9781467312615

Neuromorphic engineers aim to mimic the precise and efficient mechanisms of the nervous system to process information using spikes from sensors to actuators. There are many available works that sense and process information in a spike-based way. But there are still several gaps in the actuation and motor control field in a spike-based way. Spike-based Proportional-Integrative- Derivative controllers (PID) are present in the literature. On the other hand, neuro-inspired control models as VITE (Vector Integration To End point) and FLETE (Factorization of muscle Length and muscle Tension) are also present in the literature. This paper presents another step toward the spike implementation of those neuro-inspired models. We present a spike-based ramp multiplier. VITE algorithm generates the way to achieve a final position targeted by a mobile robotic arm. The block presented is used as a gate for the way involved and it also puts the incoming movement on speed with a variable slope profile. Only spikes for information representation were used and the process is in real time. The software simulation based on Simulink and Xilinx System Generator shows the accurate adjust to the traditional processing for short time periods and the hardware tests confirm and extend the previous simulated results for any time. We have implemented the spikes generator, the ramp multiplier and the low pass filter into the Virtex-5 FPGA and connected this with an USB-AER (Address Event Representation) board to monitor the spikes. © 2012 IEEE.

关键词： Muscle

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Introducing a remotely accessible optical laboratory for undergraduate students

Introducing a remotely accessible optical laboratory for und...

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119th ASEE Annual Conference and Exposition

作者： Farahmand, Farid Moslehpour, Saeid Kuppuru, Harika Matsa, Swathi Sonoma State University United States Electrical and Computer Engineering Department College of Engineering Technology and Architecture University of Hartford United States

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Playing it real: Magic lens and static peephole interfaces for games in a public space 12

Playing it real: Magic lens and static peephole interfaces f...

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2012 14th ACM International Conference on Human-computer Interaction with Mobile Devices and Services, MobileHCI'12

作者： Grubert, Jens Morrison, Ann Munz, Helmut Reitmayr, Gerhard Institute for Computer Graphics and Vision Graz University of Technology Austria Department of Architecture Design and Media Technology Aalborg University DK-9220 Aalborg St Denmark

ISBN: (纸本)9781450311052

Magic lens and static peephole interfaces are used in numerous consumer mobile phone applications such as Augmented Reality browsers, games or digital map applications in a variety of contexts including public spaces. Interface performance has been evaluated for various interaction tasks involving spatial relationships in a scene. However, interface usage outside laboratory conditions has not been considered in depth in the evaluation of these interfaces. We present findings about the usage of magic lens and static peephole interfaces for playing a find-and-select game in a public space and report on the reactions of the public audience to participants? interactions. Contrary to our expectations participants favored the magic lens over a static peephole interface despite tracking errors, fatigue and potentially conspicuous gestures. Most passersby did not pay attention to the participants and vice versa. A comparative laboratory experiment revealed only few differences in system usage. Copyright 2012 ACM.

关键词： Augmented reality

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Airborne Imaging: Systems, Deployments, Practices and Capabilities

Airborne Imaging: Systems, Deployments, Practices and Capabi...

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International Congress on Digital Heritage

作者： Tom Wypych Vid Petrovic James Strawson Maurizio Seracini Thomas E. Levy Falko Kuester Department of Computer Science & Engineering Center of Interdisciplinary Science for Art Architecture and Archaeology (CISA3) at the University of California San Diego's Qualcomm Institute the UCSD branch of the California Institute of Telecommunications and Information Technology (Calit2) Department of Mechanical Engineering Center of Interdisciplinary Science for Art Architecture and Archaeology (CISA3) at the University of California San Diego's Qualcomm Institute the UCSD branch of the California Institute of Telecommunications and Information Technology (Calit2) Department of Structural Engineering Center of Interdisciplinary Science for Art Architecture and Archaeology (CISA3) at the University of California San Diego's Qualcomm Institute the UCSD branch of the California Institute of Telecommunications and Information Technology (Calit2) Department of Anthropology Center of Interdisciplinary Science for Art Architecture and Archaeology (CISA3) at the University of California San Diego's Qualcomm Institute the UCSD branch of the California Institute of Telecommunications and Information Technology (Calit2)

Overview We present a functional implementation of an unmanned aerial vehicle complete with image acquisition payloads for the documentation and virtual reconstruction of cultural heritage sites. We discuss technological advances in unmanned aerial vehicles, as well as contemporary practices in implementation, which have evolved in the direction of reducing costs, enabling new functionalities, and emerging applications in cultural heritage fieldwork. These advances are the basis for the design and execution of our unmanned aircraft, which we develop to collect unique and comprehensive datasets in challenging acquisition scenarios at active cultural heritage sites. Our platform is able to perform visual imaging, using a variety of acquisition triggers and mechanisms to enable high-resolution in-plane site photogrammetry, oblique aerial examinations of large sites, and sequence acquisitions for use in structure from motion based volumetric reconstructions of specific areas of interest. This data is in turn suitable for exploration with or without volumetric post processing techniques using visual analysis techniques using interactive high resolution tiled display inspection environments.

关键词： Practices Capabilities implementation

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Optimization of multiple sequence alignment methodologies using a multiobjective evolutionary algorithm based on NSGA-II

Optimization of multiple sequence alignment methodologies us...

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Congress on Evolutionary Computation

作者： Francisco Ortuno Javier P. Florido Jose M. Urquiza Hector Pomares Alberto Prieto Ignacio Rojas Department of Computer Architecture and Computer Technology University of Granada Granada Spain

Multiple sequence alignment (MSA) is one of the most studied approach in Bioinformatics to carry out other outstanding tasks like structural predictions, biological function analysis or next-generation sequencing. However, MSA algorithms do not achieve consistent results in all cases, as alignments become difficult when sequences have low similarity. In other words, each algorithm is focused in specific features of sequences and their results depend on them. For this reason, each approach could align better those sections of sequences that include such features, obtaining partially optimal solutions. In this work, a multiobjective evolutionary algorithm based on NSGA-II will be implemented in order to assemble previously aligned sequences, trying to avoid suboptimal alignments.

关键词： Algorithm design and analysis Optimization Evolutionary computation Biological cells Clustering algorithms Muscles

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Pool vs. island based evolutionary algorithms: An initial exploration

Pool vs. island based evolutionary algorithms: An initial ex...

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2012 7th International Conference on P2P, Parallel, Grid, Cloud and Internet Computing, 3PGCIC 2012

作者： Merelo, J.J. Mora, A.M. Fernandes, C.M. Esparcia-Alcázar, Anna I. Laredo, Juan L.J. University of Granada Department of Computer Architecture and Technology ETSIIT 18071 - Granada Spain S2 Grupo Valencia Spain University of Luxembourg Luxembourg

ISBN: (纸本)9781467329910

This paper explores the scalability and performance of pool and island based evolutionary algorithms, both of them using as a mean of interaction an object store, we call this family of algorithms SofEA. This object store allows the different clients to interact asynchronously, the point of the creation of this framework is to build a system for spontaneous and voluntary distributed evolutionary computation. The fact that each client is autonomous leads to a complex behavior that will be examined in the work, so that the design can be validated, rules of thumb can be extracted, and the limits of scalability can be found. In this paper we advance the design of an asynchronous, fault-tolerant and scalable distributed evolutionary algorithm based on the object store CouchDB. We test experimentally the different options and show the trade-offs that pool and island-based solutions offer. © 2012 IEEE.

关键词： Evolutionary algorithms

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Convolution computation in FPGA based on carry-save adders and circular buffers

Convolution computation in FPGA based on carry-save adders a...

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3rd International ICST Conference on IT Revolutions, 2011

作者： Moreno, Carlos D. Martínez, Pilar Bellido, Francisco J. Hormigo, Javier Ortiz, Manuel A. Quiles, Francisco J. Computer Architecture Electronics and Electronic Technology Department University of Córdoba Spain Applied Physics Department EPS University of Córdoba Spain Computer Architecture Department University of Málaga Spain Campus Universitario de Rabanales 14071 Córdoba Spain Campus Universitario de Teatinos 29080 Málaga Spain

ISBN: (纸本)9783642323034

In this article, we present some architectures to carry out the convolution computation based on carry-save adders and circular buffers implemented on FPGAs. Carry-save adders are not frequent in the implementation in FPGA devices, since these have a fast carry propagation path. We make use of the specific structure of the FPGA to design an optimized accumulator which is able to deal with carry-save additions as well as carry-propagate additions using the same hardware. On the other hand, this structure of circular buffers allows the convolution computation of two signals with two algorithms of calculation: the input side algorithm and the output side algorithm, in a more efficient way. © 2012 ICST Institute for computer Science, Social Informatics and Telecommunications Engineering.

关键词： Field programmable gate arrays (FPGA)

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Design, implementation and validation of a simulation tool for Networked Virtual Environments

Design, implementation and validation of a simulation tool f...

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International Conference on computer, Information and Telecommunication Systems (CITS)

作者： Juan Luis Font Jose Luis Sevillano Daniel Cascado-Caballero Gema Lopez-Muñoz Berhanu Regassa Department of Computer Technology and Architecture University of Seville Spain

The popularisation of Networked Virtual Environment (NVE) applications in several context, including social interaction and e-Health fields, makes them an interesting subject of study. The proper estimation of their network requirements are key to ensure a good user experience, an important factor that determines the acceptance and success of the applications. The studies focused on NVE with an important social component are relatively scarce. This paper presents the design, implementation and validation of a simulation tool to assist in the study of the requirements of a NVE application, Open Wonderland. This tool will facilitate the study of several parameters that define the user experience. The study describes the overall structure, development framework and models that define the traffic generation patterns and validates the simulation results by comparing its traces with real traffic from previous studies.

关键词： Throughput OWL Synchronization Mathematical model Servers Equations Virtual environments

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An experimental evaluation of server performance in Networked Virtual Environments

An experimental evaluation of server performance in Networke...

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International Symposium on Performance Evaluation of computer and Telecommunication Systems

作者： Juan Luis Font Jose Luis Sevillano Daniel Cascado Department of Computer Technology and Architecture University of Seville Spain

ISBN: (纸本)9781618399823;1618399829

Several works in the literature have recently addressed the study of different Networked Virtual Environments (NVE) due to their increasing popularity and widespread use in fields ranging from entertainment to e-Health. Open Wonderland is one of these NVEs which has been the subject of several studies mainly focused on the client side. This paper aims to cover the server-side performance issues to provide complementary results that can be useful for properly sizing Open Wonderland systems according to the number of expected users. An experimental testbed is used, which provides real data that shows that CPU and outgoing bandwidth are the most critical parameters when the number of clients increase.

关键词： Open Wonderland Networked Virtual Environment Server performance Monitoring Profiling Testbed

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A ubiquitous system using semantic knowledge in dynamic service integration

A ubiquitous system using semantic knowledge in dynamic serv...

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2nd International Conference on Pervasive Embedded Computing and Communication Systems, PECCS 2012

作者： Dziubich, Tomasz Kaczmarek, Pawel Nasiadka, Slawomir Department of Computer Systems Architecture Faculty of Electronics Gdánsk University of Technology Narutowicza 11/12 Str. 80-233 Gdańsk Poland

ISBN: (纸本)9789898565006

The paper presents a ubiquitous system that uses semantic information to manage dynamic changes in system elements. We design the system using the Context-Controller-Action architecture that covers the main parts of ubiquitous environments, including: environment devices (such as sensors and actuators), contexts and actions, all of which may be dynamically configured during system operation. A graphical user interface for the system is supplied, which enables non-expert users to perform changes in system configuration. Internally, semantic information is used throughout the system to define a common language between devices, contexts and services. A Web services interface is used in services that handle environment devices to support their integration with the system regardless of internally used communication protocols. The architecture was implemented as a framework for developing and running applications in ubiquitous environments. We integrated a number of devices in the framework, including, RFID sensors, digital displays, cameras, electronic door locks and others. We also defined exemplary contexts and actions in the environment.

关键词： Graphical user interfaces

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