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Comparison of D-Model and Wall-Attenuation Model for Signal Strength Estimations in Indoor Environment

Comparison of D-Model and Wall-Attenuation Model for Signal ...

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International Conference on Computational Intelligence, Modelling and Simulation (CSSIM)

作者： Shiraz Latif Muhammad Ghazanfar Aftab Memon Bhawani Shankar Chowdhry Javed Ahmed Department of Electrical Engineering Usman Institute of Technology Hamdard University Karachi Pakistan Department of Telecommunication Engineering Mehran University of Engg. & Technology Jamshoro Pakistan Department of Computer Science Sukkur Institute of Business Administration Sukkur Pakistan

Signal Strength estimation is important aspect for planning of wireless networks and for generating radio signal maps. There is a variety of approaches to estimate the signal strength in indoor environment that is broadly classified as empirical model based signal strength estimations and deterministic model based signal strength estimations. Empirical models are widely used models for the received signal strength mapping and estimations but they always have a problem of reduced accuracy. Wall attenuation models are considered to be the model widely used and the simplest models but it lacks the accuracy whereas D-model is a newly proposed model that is more précised but not fully mature model. This paper compares both these models in terms of accuracy of RSS estimations in indoor environment especially for obstacles like walls and floors.

关键词： Attenuation Radio transmitters Receivers Propagation losses Estimation Accuracy Floors

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The Use of Support Vector Machine and Genetic Algorithms to Predict Protein Function

The Use of Support Vector Machine and Genetic Algorithms to ...

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IEEE International Conference on Systems, Man, and Cybernetics

作者： Walkiria K. Resende Renato A. Nascimento Carolina R. Xavier Iara F. Lopes Cristianc N. Nobre Department of Computer Science Universidade Federal de Sao Joao del Rei - UFSJ Department of Computer Science Pontificia Universidade Catolica de Minas Gerais PUC/MG Civil Engineering Program COPPE - UFRJ

ISBN: (纸本)9781467317139

In Bio informatics, the prediction of protein function is considered a very important task but also difficult. Using a set of enzymes represented by Hydrolase, Isomerase, Ligase, Lyase, Transferase and Oxidoreductase classes, previously used by Dobson et ah, this paper proposes a self-learning process able to predict their classes, based on their primary and secondary structures, through a Support Vector Machine (SVM) classifier and genetic algorithm. An SVM can he characterized as a supervised machine learning algorithm capable of resolving linear and non-linear classification problems. During the learning process, both the training data and the corresponding output are presented to the SVM to allow its parameters to he adjusted. This study utilized genetic algorithms - optimization heuristics often used to estimate parameters - to adjust the main parameters of the classifier such as kernel function type and parameter C, which provides the relationship between the training error and the margin of separation between classes. In this specific prediction problem, the results indicate that the best function is an RBF where width is 6.1 and C is 6.9. Using these parameters, the classifier obtains an average accuracy of 79.74%.

关键词： Component: Proteins Prediction Support Vector Machine Genetic Algorithms protein structure function Support Vector Network Genetic Algorithm (GA) Classifiers Learning processes secondary structures

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Parallelization of DVFS-enabled H.264/AVC Decoder on Heterogeneous Multi-core Platform

Parallelization of DVFS-enabled H.264/AVC Decoder on Heterog...

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International Symposium on computer, Consumer and Control (IS3C)

作者： Yu-Sheng Lu Chin-Feng Lai Yueh-Min Huang Department of Engineering Science National Cheng Kung University Tainan Taiwan Business Customer Solutions Laboratory Chunghwa Telecommunication Laboratories Taoyuan Taiwan Institute of Computer Science and Information Engineering National Ilan University I-Lan Taiwan

Using a multi-core system to process real-time data of high computational complexity has become a popular solution for effectively enhancing system processing efficiency. However, the high-power consumption of a multi-core system remains a problem, particularly to handheld devices. Applying DVFS to properly decrease the system voltage and frequency can effectively save system power loss, nevertheless, the question of how to effectively and accurately configure a dynamic DVFS system to avoid missing a deadline or extra power loss remains to be widely discussed. This study examines many previous parallel processing architectures and DVFS mechanisms, and proposes two different orientations of parallel DVFS-enabled H.264/AVC decoders, and implements a multimedia heterogeneous multi-core platform. Based on experimental data, the impact of two parallel DVFS-able processing systems on H.264 decoding performance and power loss are studied.

关键词： computers

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The web portal “Active longevity of Kazakhstan population”: Actuality, objectives, functions and preliminary results

The web portal “Active longevity of Kazakhstan population”...

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International Symposium on Soft Computing and Intelligent Systems (SCIS)

作者： R. I. Muhamedyev V. G. Dmitriyev M. M. Maratov I. M. Ualiyeva B. Taishmanov E. L. Muhamedyeva D. V. Zagulova A. T. Mansharipova Computer science software engineering & telecommunication department International IT University Almaty Kazakhstan Riga Technical University Baltic International Academy Riga Latvia Kazakh Russian Medical University

Increasing the duration of active life is one of the most important problems in modern gerontology in the world, including Kazakhstan. First, the solution of these problems is associated with using information and communication technologies (ICT). Gerontological RK portal, which has no analogues in countries of the former USSR, will include information on major aspects of the aging in RK. Portal will be a platform for exchange of experiences, publishing of research results, for getting generalized and personalized information. This paper describes the main elements of the portal and presents preliminary results of frequency occurrence analysis of cardiovascular diseases in elderly age and income level of the respondent on the basis of epidemiological screening, performed on the basis of data collected on our site.

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Entropy functions and determinant inequalities

Entropy functions and determinant inequalities

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IEEE International Symposium on Information Theory

作者： Terence Chan Dongning Guo Raymond Yeung Institute of Telecommunication Research University of South Australia Australia Department of Electrical Engineering and Computer Science Northwestern University USA Institute of Network Coding and Department of Information Engineering Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)9781467325790

In this paper, we show that the characterisation of all determinant inequalities for n × n positive definite matrices is equivalent to determining the smallest closed and convex cone containing all entropy functions induced by n scalar jointly Gaussian random variables. We have obtained inner and outer bounds on the cone by using representable functions and entropic functions. In particular, these bounds are tight and explicit for n ≤ 3, implying that determinant inequalities for 3 × 3 positive definite matrices are completely characterized by Shannon-type information inequalities.

关键词： Vectors Entropy Random variables Linear matrix inequalities Cramer-Rao bounds Information theory Educational institutions

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On the ergodic secret message capacity of the wiretap channel with finite-rate feedback

On the ergodic secret message capacity of the wiretap channe...

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IEEE International Symposium on Information Theory

作者： Zouheir Rezki Ashish Khisti Mohamed-Slim Alouini Electrical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal Makkah Saudi Arabia Electrical and Computer Engineering Department University of Toronto Toronto ONT Canada Electrical Engineering Program Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology Thuwal Makkah Saudi Arabia

We study the secret message capacity of an ergodic block fading wiretap channel with partial channel state information at the transmitter and perfect channel state information at the receivers. We consider that in addition to the statistics of the main and the eavesdropper channel state information (CSI), the sender is provided by the legitimate receiver with a q-bit feedback, at the beginning of each coherence block, through an error-free feedback channel, with capacity q bits. We establish upper and lower bounds on the secrecy capacity. We show that a positive secrecy rate is achievable even when the feedback is at the end of each coherence block and q = 1. We also show that the lower and the upper bounds coincide asymptotically as q → ∞. Finally, asymptotic analysis at high Signal-to-Noise Ratio (SNR) are presented where it is found that the capacity is bounded at high-SNR and present a simple suboptimal scalar quantizer that is capacity achieving, without the need of any numerical optimization, as q → ∞. When applied to Rayleigh fading channels, we show that, at high-SNR, a 4-bit feedback achieves 90% of the secrecy capacity when perfect main CSI is available at the transmitter.

关键词： Coherence Upper bound Fading Automatic repeat request Signal to noise ratio Transmitters Receivers

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Smart Environmental Architecture for Node Localization in a Wireless Sensor Network

Smart Environmental Architecture for Node Localization in a ...

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International Conference on Intelligent Environments (IE)

作者： Salvador Jauregui-Ortiz Mario Siller Felix Ramos Edson Scalabrin Electrical Engineering and Computer Science Department Center of Research and Advanced Studies of the IPN Guadalajara Jalisco Mexico Graduate Program in Computer Science Pontifical Catholic University Parana Brazil Curitiba Parana Brazil

As far as we know, there is not a Node Localization Algorithm (NLA) that presents the same accuracy for all possible scenarios. We believe that a NLA should be able to "interpret" the dynamic information of the environment. In this sense, simple NLAs are rather focused and might perform well for specific scenarios and applications. Therefore, information fusion and context awareness seems to be an appropriate approach to address this issue. We propose the Smart Environmental Architecture for Node Localization (SEA-NL), which is composed by two main elements: (i) the Smart Beacon Nodes (SBNs) and (ii) the Logical Position of Nodes (LPN). In (i) the obstruction level indicator is estimated and can improve the estimation of distances among nodes. In (ii) environment information and a one to one relation between a node and an object are used and can also improve location estimation. Via simulation, our architecture was tested indoors and outdoors considering three localization algorithms: the Weighed Centroid Localization (WCL), the Centroid Localization, and the Triangular Centroid Localization. Finally, we present an accuracy comparison among NLAs used in isolated way, and by using the SBNs, the LPN, and the SEA-NL, where our architecture improves WCL up to ~30.88%.

关键词： Wireless sensor networks Accuracy Estimation computer architecture Buildings Attenuation Monitoring

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Applying MVC to Evolutionary Acquisition IRPM

Applying MVC to Evolutionary Acquisition IRPM

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2012 International Conference on Smart Grid Systems(ICSGS 2012)

作者： Patrick Letouze Mariwaldo G. Caetano Joāo Y. Ishihara David Prata George Brito UFT-Federal University of Tocantins Brazil:Department of Computer Science UnB-University of Brasilia Brazil:Department of Electrical EngineeringPGEA-Program of Post-Graduation in Electronic and Automation Systems Engineering

This work presents a combination of the Model-View-Controller pattern with the Evolutionary Acquisition Interdisciplinary Research Project Management for web services *** intends to promote an increase in productivity and to facilitate interdisciplinary web services *** consists of an independent database for users' feedback that together with technological opportunities and evolving threats considerations may start a new release of the system allowing a dynamic evolution through acquiring new features or correcting errors,but the new release decision is not *** other words,web service evolution is accomplished adding requirements analysis into the Model-View-Controller pattern,which is incorporated into Interdisciplinary Research Project Management.

关键词： Evolutionary acquisition,IRPM,MVC,project management,software engineering,web services.

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All dielectric zero-index metamaterials at optical frequencies

All dielectric zero-index metamaterials at optical frequenci...

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Conference on Optoelectronic and Microelectronic Materials and Devices

作者： J. Valentine P. Moitra Y. Yang W. Wang Department of Mechanical Engineering Vanderbilt University Nashville TN USA Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

Dielectric metamaterials offer a potential low-loss alternative to plasmonic metamaterials at optical frequencies. However, demonstrations of dielectric metamaterials have so far been limited to microwave and mid-infrared frequencies. In this work, we outline the development of purely dielectric zero-index metamaterials operating at optical frequencies. The metamaterial, formed from silicon rods, exhibits impedance matching with air, resulting in unity transmission at the zero-index point. Design and experimental realization of the metamaterials is presented. The metamaterials can potentially be used for a number of applications including compact lens systems, directional emitters, and transformation optics devices.

关键词： Metamaterials Magnetic materials Silicon Optical device fabrication Dielectrics Optical refraction

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The global financial markets: An ultra-large-scale systems perspective

The global financial markets: An ultra-large-scale systems p...

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17th Monterey Workshop on Large-Scale Complex IT Systems, LSCITS 2012

作者： Cliff, Dave Northrop, Linda UK Large Scale Complex IT System Initiative Department of Computer Science University of Bristol Bristol BS8 1UB United Kingdom Research Technology and System Solutions Program Software Engineering Institute Carnegie-Mellon University Pittsburgh PA 15213 United States

ISBN: (纸本)9783642340581

We argue here that, in recent years, the world's financial markets have become a globally interconnected complex adaptive ultra-large-scale socio-technical system-of-systems, and that this has important consequences for how the financial markets should be engineered and managed in future. Major failures in the financial markets can now occur at super-human speeds, as was witnessed in the "Flash Crash" of May 6th 2010. Events such as the Flash Crash may become more commonplace in future, unless lessons are learned from other fields where complex adaptive socio-technical systems-of-systems have to be engineered for high-integrity, safety-critical applications. In this document we review the literature on failures in risky technology and high-integrity approaches to safety-critical SoS engineering. We conclude with an argument that, in the specific case of the global financial markets, there is an urgent need to develop major national strategic modeling and predictive simulation capabilities, comparable to national-scale meteorological monitoring and modeling capabilities. The intent here is not to predict the price-movements of particular financial instruments or asset classes, but rather to provide test-rigs for principled evaluation of systemic risk, estimating probability density functions over spaces of possible outcomes, and thereby identifying potentially high-consequence failure modes in the simulations, before they occur in real life, by which time it is typically too late. © 2012 Springer-Verlag.

关键词： Information technology

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