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Brazilian Symposium on computing System Engineering (SBESC)

作者： Diogo Olsen Carlos Maziero Graduate Program in Computer Science Pontifical Catholic University of Paraná Brazil Graduate Program in Applied Computing Federal University of Technology-Paraná Curitiba Brazil

Context-Aware computing aims at making computing systems able to capture context information and to adapt to it, providing context-related services and information to users. Context is any information used to characterize in some sense a person, object, or place of interest for a given user or application. Initial definitions of context-aware computing date from twenty years ago, but until now it was not yet fully made available to end users. This paper proposes a generic model of a context manager for general-purpose operating systems, alongside with its implementation and first evaluation results. This model includes methods for building, storing, and managing contexts, and an API to make such information available to applications and users.

关键词： Context modeling Context Computational modeling Context-aware services Software Integrated circuit modeling

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Particle Swarm Optimization Applied to the Dynamic Allocation Problem

Particle Swarm Optimization Applied to the Dynamic Allocatio...

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Brazilian Symposium on Neural Networks

作者： Jean L. Pierobom Myriam R. Delgado Celso A.A. Kaestner Graduate Program on Applied Computing (PPGCA) Federal University of Technology of Paraná (UTFPR) Curitiba Parana Brazil

Particle Swarm Optimization (PSO) is based on the analysis of emergent behavior of bird flocks. Though it was originally designed for continuous optimization, PSO has provided good results in some recent works when applied to static and discrete optimization problems. In this paper, the particle encoding scheme is based on permutations and the PSO algorithm is adapted to solve a real-world application (cabs-customers allocation) of the dynamic task assignment problem. In the proposed approach, as the optimal solution may change during the optimization process, different strategies to detect and react to changes are tested. The results show that combinations of traditional techniques achieve good solutions in tested instances defined with different sizes and scales of changes.

关键词： Heuristic algorithms Optimization Resource management Robustness Particle swarm optimization Monitoring Accuracy

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Evaluation of process variability on current for nanotechnologies devices

Evaluation of process variability on current for nanotechnol...

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2012 IEEE 3rd Latin American Symposium on Circuits and Systems, LASCAS 2012

作者： Meinhardt, Cristina Reis, Ricardo Computer Science Center - C3 Federal University of Rio Grande - FURG Rio Grande Brazil Graduate Program in Computing Institute of Informatics Federal University of Rio Grande Do Sul - UFRGS Porto Alegre Brazil

ISBN: (纸本)9781467312080

The continuous shrinking of devices has introduced new challenges to integrated circuit design, mainly to deal with the parametric variations in process parameters. This paper presents an evaluation of the process variability on the current Ids of nanotechnologies devices, individually and simultaneously, taking into account the correlation among them. The results show that the deviation from mean value is quite significant ≈ 16% for high performance models. The variation of L has the dominant effect on the overall variation of the device in high performance models while the dominant effect on the overall variation of the device in low power models still being due to Vth variations. Lastly, the effect of process parameter variations deteriorates with technology scaling, with a considerable increase in the deviation from the 22nm to 16nm technology. © 2012 IEEE.

关键词： Nanotechnology

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Mingle spontaneous social network

Mingle spontaneous social network

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International Conference on Computational Aspects of Social Networks, CASON

作者： Dante Zaupa Cristiano André da Costa Jéssica Silva Jorge Barbosa Adenauer Yamin Applied Computing Graduate Program - PIPCA University of Vale do Rio dos Sinos - UNISINOS São Leopoldo Brazil Graduate Program in Computer Science - PPGC Federal University of Pelotas - UFPEL Pelotas Brazil

Social networks provide a new way of communication that still preserves our human social interaction. Due to the widespread use of mobile devices, people tend to use their smartphone or tablet as the main way to make that interaction. Furthermore, applications developed to these devices are fostering the use of contextual information, such as the location of the user. In this way, this article proposes Mingle, a model for a spontaneous social network targeted at mobile devices. In our proposal, the social network is spontaneous, i.e. involves only people that are physically present in a specific location. Besides presenting the model, we show a developed prototype using Android-based devices. We evaluated Mingle employing two strategies, a usage case and a performance evaluation. The results were encouraging and show the potential of deploying Mingle in real situations.

关键词： Social network services Servers Computer architecture Mobile handsets Microprocessors Ontologies Telecommunication traffic

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U'Ductor: A Model for Supporting Ubiquitous Chronic Disease Care Management

U'Ductor: A Model for Supporting Ubiquitous Chronic Disease ...

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Simpasio em Sistemas Computacionais (WSCAD-SSC)

作者： Henrique Vianna Jorge Barbosa Cristiano Costa Adenauer C. Yamin Applied Computing Graduate Program-PIPCA UNISINOS Sao Leopoldo Brazil Computer Science-Polytechnic Center UCPEL Pelotas Brazil

Accordingly with the World Health Organization, heart disease, chronic respiratory diseases, cancer and diabetes are the most common chronic diseases and one of the leading causes of the mortality in the world. In such cases we need more than patient engagement to help to control of the disease, community and health organizations support is also desirable. These roles must support the patients' self-management activities, making them feel confident and motivated. This support can be accomplished by ubiquitous computing. The ubiquitous computing gives conditions to help chronic diseases patients in the management of their activities, offering support to them anytime, anywhere. In this context, this article presents U'Ductor, a model for supporting ubiquitous chronic care management, whose goal is to help the integration between patient and community resources. The U'Ductor gives a step forward in relation to the studied related works by integrating patients, community resources and community members. Those features were not completely explored in the studied works in the way we employ in U'Ductor. An implementation of the model was evaluated by a chronic patient, which gave a positive feedback about it.

关键词： Monitoring Middleware Biomedical monitoring Computational modeling Diseases Communities Diabetes

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A Committee of MLP with Adaptive Slope Parameter Trained by the quasi-Newton Method to Solve Problems in Hydrologic Optics

A Committee of MLP with Adaptive Slope Parameter Trained by ...

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International Joint Conference on Neural Networks

作者： Fabio Dall Cortivo Ezzat S. Chalhoub Haroldo F. Campos Velho Applied Computing Graduate Program (CAP) National Institute for Space Research (INPE) Sao Jose dos Campos Associated Laboratory for Computing and Applied Mathematics (LAC) National Institute for Space Research (INPE)

ISBN: (纸本)9781467314886

Artificial Neural Networks (ANNs) can be used to solve problems in Hydrologic Optics. A relevant problem is the estimation of the single scattering albedo and the phase function parameters, from the emitted radiation at the surface of natural waters. In this work we use a committee of ANNs of Multilayer Perceptron type to perform the estimation of the two mentioned parameters. The training of each network is formulated as a nonlinear optimization problem subject to constraints. In addition, each activation function has a distinct slope parameter, that is initially chosen by a random number generator function. This set of parameter (slopes) was included within the free variables network set in order to be adjusted to reach "optimal values", together with the weights and biases, during the network training. This procedure (slope parameters inclusion) makes each one of the activation functions to have a different slope. Each network that composes the committee was trained independently, in order to become expert for the estimation of only one of the hydrologic parameters. For the networks training, we used the quasi-Newton method that is implemented in E04UCF subroutine, in the NAG library, developed by the Numerical Algorithms Group - NAG. The use of the quasi-Newton method to train the networks together with the distinct slope parameters resulted in a network with a fast learning and excellent generalization. Once the networks were trained, they were grouped so to share the input patterns, but remained independent from one another. For the validation/generalization test we used two distinct sets. For all considered noise levels, we obtained 100% of correct answers for the first set, and above 90% of correct answers for the second set.

关键词： Artificial Neural Network Multilayer Perceptron Backpropagation Quasi-Newton Method Hydrologic Optics Phase Function Single Scattering Albedo Inverse Problems SLOPE FACTOR Newton method Slope parameter Artificial neural networks CSRP3 gene Network Optics hydrologic parameters Hydrology functional parameter Random Number Generators Activating function input mode

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A Proposal of a Mobile Payment System Based on Android

A Proposal of a Mobile Payment System Based on Android

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International Conference on Innovative Mobile and Internet Services in Ubiquitous computing (IMIS)

作者： Alex Roehrs Cristiano André da Costa Jorge Luis Victória Barbosa Applied Computing Graduate Program-PIPCA Universidade do Vale do Rio dos Sinos (UNISINOS) Sao Leopoldo Rio Grande do Sul Brazil

ISBN: (纸本)9781467313285

This paper aims at presenting an architectural model proposal for a novel Mobile Payment System, called 4iPay. This work considers the following premises: independence of device, location, carrier and cardholder to meet the needs of executing payment transactions in ubiquitous commerce. Our proposal considers the convergence of concepts of ubiquity, unity, universality and unison to form the proposed model. This article describes the model, implementation, preliminary assessments and requirements for mobile payment in ubiquitous environments. We developed a prototype of 4iPay using Android smart phones. The prototype was evaluated in three different scenarios.

关键词： Mobile communication Mobile handsets Security Proposals Performance evaluation Servers

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Evaluation of Process Variability on Current for Nanotechnologies Devices

Evaluation of Process Variability on Current for Nanotechnol...

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IEEE Latin American Symposium on Circuits and Systems

作者： Cristina Meinhardt Ricardo Reis Computer Science Center - C3 Federal University of Rio Grande - FURG Graduate Program in Computing Institute of Informatics Federal University of Rio Grande do Sul - UFRGS

ISBN: (纸本)9781467312073

关键词： Cutting parameters Nanotechnologies currents electric current HIGH-PERFORMANCE parameter variation Deviation mean value powered models

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Response of aqueous dichromate and nanoclay dichromate gel dosimeters to carbon ion irradiation

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Journal of Physics: Conference Series 2013年第1期444卷

作者： T Maeyama N Fukunishi K L Ishikawa K Fukasaku T Furuta S Takagi S Noda R Himeno S Fukuda RIKEN/Nishina Center for Accelerator-Based Science Wako Japan RIKEN/Computational Science Research Program Wako Japan The University of Tokyo/Department of Nuclear Engineering and Management Graduate School of Engineering Tokyo Japan The University of Tokyo/Photon Science Center Graduate School of Engineering Tokyo Japan Himon'ya Hospital/ Department of Neurosurgery Tokyo Japan RIKEN/Advanced Center for Computing and Communication Wako Japan The University of Tokyo/Department of Mechanical Engineering Graduate School of Engineering Tokyo Japan National Institute of Radiological Sciences/ Research Center for Charged Particle Therapy Chiba Japan

We have recently reported the significant reduction of radiation product diffusion by the incorporation of clay nanoparticles into dichromate gel (DCG) dosimeters. In this work, we investigate the influence of the nanoclay addition and gelation on the MRI R1 (1/T1) image response of the dichromate dosimeter to the therapeutic carbon ion beam (12C6+ 290 MeV/u). The MRI R1 distribution in the aqueous dichromate solution well reproduces physical dose-depth distribution with a high linear-energy-transfer (LET) efficiency. The nanoclay DCG dosimeters, on the other hand, exhibit composition-dependent LET efficiency degradation, while a sharp Bragg peak can still be detected. These results indicate that the nanocomposite gel addition may induce change in the radiation-induced reaction mechanism.

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From laptops to supercomputers: a single highly scalable code base for spiking neuronal network simulations

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BMC Neuroscience 2013年第1期14卷 1-2页

作者： Susanne Kunkel Abigail Morrison Markus Diesmann Maximilian Schmidt Jochen M Eppler Moritz Helias Hans E Plesser Jun Igarashi Tomoki Fukai Gen Masumoto Shin Ishii Simulation Laboratory Neuroscience - Bernstein Facility Simulation and Database Technology Institute for Advanced Simulation Jülich Aachen Research Alliance Jülich Research Centre Germany Institute of Neuroscience and Medicine (INM-6) and Institute for Advanced Simulation (IAS-6) Jülich Research Centre and JARA Germany Bernstein Center Freiburg Albert-Ludwig University of Freiburg Germany Institute of Cognitive Neuroscience Faculty of Psychology Ruhr-University Bochum Germany Medical Faculty RWTH University Aachen Germany Laboratory for Neural Circuit Theory RIKEN Brain Science Institute Wako Japan Department of Mathematical Sciences and Technology Norwegian University of Life Sciences Aas Norway High-Performance Computing Team RIKEN Computational Science Research Program Kobe Japan Integrated Systems Biology Laboratory Department of Systems Science Graduate School of Informatics Kyoto University Japan

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