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In this paper, we present a new method for the design of ergodic sum-of-sinusoids (SOS) simulation models for multiple uncorrelated Rayleigh fading channels. The method, which is intended for a special class of SOS models, known as sum-of-cisoids (SOC) models, can be used to generate an arbitrary number of uncorrelated Rayleigh fading waveforms with specified Doppler power spectral characteristics...
For the first time we introduce experimental evidence of an anomalous or unconventional Room-Temperature QHE at B fields at and below 50 mT (milli-Teslas). The observed Ultra-High-Conductivity-State (UHCS), and negative channel current are explained in terms of a fractional-dimensional charge transmission, quasi-particle-phonon resonance, and marginal phase (semiconductor-insulator) transition. We...
Sudoku is a very popular puzzle which consists on placing several numbers in a squared grid according to some simple rules. In this paper we present an efficient family of P systems which solve sudokus of any order verifying a specific property. The solution is searched by using a simple human-style method. If the sudoku cannot be solved by using this strategy, the P system detects this drawback and...
Inspired by political parties' behavior in parliament's elections of chairman, Parliameantary Optimization Algorithm (POA) has emerged as a new stochastic population-based optimizer. Current research has proven POA efficiency in numerical optimization but it is difficult to find a POA version that deals with combinatorial optimization. In this paper we present a parliamentary algorithm that can solve...
This paper presents a web tool that uses Java Server Faces to design questions graphically, to test the outcome in a learning environment and to export them using the QTI v2.1 specification in order to ensure interoperability between different learning systems.
This paper proposes to improve the Simple Query Interface (SQI), designed to query learning object repositories, modifying a few existing methods to generate new ones. Replacement is not intended, instead, our proposal is to create new methods that incorporate several enhancements in order to enable compatibility with currently compliant systems that use the old methods. Besides, new methods are also...
The Level 1 Processing of SMOS transforms the data acquired by MIRAS (Microwave Imaging Radiometer with Aperture Synthesis) into geolocated TOA Brightness Temperatures, providing observation angles and additional parameters for the Level 2 Processor. Prior to SMOS launch in November 2009 the Level 1 Prototype Processor (L1PP) lead the way for specifying product types and contents, as well as to define,...
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