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Mémoire de Maîtrise
DOI
https://doi.org/10.11606/D.76.2004.tde-13092007-165832
Document
Auteur
Nom complet
Francisco Aparecido Rodrigues
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Carlos, 2004
Directeur
Jury
Travieso, Gonzalo (Président)
Capelle, Klaus Werner
Ferreira, Joao Eduardo
Titre en portugais
Técnicas de orientação ao objeto para computação científica paralela
Mots-clés en portugais
Computação científica
Computação paralela
Orientação ao objeto
Resumé en portugais
Neste trabalho apresentamos a metodologia de orientação ao objeto no desenvolvimentos de uma biblioteca de classes para facilitar o processo de programação numérica paralela. Na implementação dos métodos das classes utilizamos as rotinas do pacote ScaLAPACK, sendo que essas classes oferecem métodos para manipulações matriciais básicas e para a diagonalização de matrizes, onde essas matrizes podem ser reais e complexas, de simples e dupla precisão. Este trabalho apresenta detalhes de implementação e uma análise comparativa de desempenho, a fim de mostrarmos a eficiência e as facilidades de uso da orientação ao objeto no desenvolvimento de programas científicos paralelos.
Titre en anglais
Object orinted techniques for parallel scientific computing
Mots-clés en anglais
Object orientation
Parallel computing
Scientific computation
Resumé en anglais
In this work current vs. voltage (I vs. V) and alternating conductivity (ac) measurements were carried out in poly[(2-methoxy- 5-hexyloxy)-pphenylenevinilene] ? MEH-PPV light-emitting diodes having zinc oxide (ZnO) as transparent anode and Al as metallic cathode. MEH-PPV is a PPV derivative, which emits in the red spectral region; ZnO has a work function similar to that of ITO, but it is less aggressive to the polymer, less expensive and easily processed. The retificated I vs. V curves shows that the direct current depends on the temperature. Moreover, the real and imaginary components of alternating conductivity (ac) present typical behavior of somewhat disordered material: the imaginary component grows as a function of the frequency and the real component was observed to be frequency independent for lower frequencies, and follows a power-law above a certain frequency. The Random Energy Free Barrier model approaches and a resistance in series for the interface phenomenon were developed and adjusted for the ac results. From this experimental-theoretical fitting we obtained important parameters of the devices as well as, quantitative informations about the MEH-PPV transport phenomenon.
 
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Date de Publication
2007-09-21
 
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