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An interface between single assignment C and vector pascalLi, Bin. January 2007 (has links)
Thesis (Ph.D.) - University of Glasgow, 2007. / Ph.D. thesis submitted to the Department of Computing Science, Faculty of Information and Mathematical Sciences, University of Glasgow, 2007. Includes bibliographical references. Print version also available.
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A structural skeleton based shape indexing approach for vector imagesSong, Mingkui. January 2009 (has links)
Thesis (Ph. D.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Computer Science, 2009. / Includes bibliographical references.
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Automatic detection of image orientation using Support Vector MachinesWalsh, Dane A. 12 1900 (has links)
Thesis (MSc)--University of Stellenbosch, 2002. / ENGLISH ABSTRACT: In this thesis, we present a technique for the automatic detection of image orientation using Support
Vector Machines (SVMs). SVMs are able to handle feature spaces of high dimension and automatically
choose the most discriminative features for classification. We investigate the use of various
kernels, including heavy tailed RBF kernels. We compare the classification performance of SVMs
with the performance of multilayer perceptrons and a Bayesian classifier. Our results show that SVMs
out perform both of these methods in the classification of individual images. We also implement an
application for the classification of film rolls in a photographic workflow environment with 100%
classification accuracy. / AFRIKAANSE OPSOMMING: In hierdie tesis, gebruik ons 'n tegniek vir die automatiese klassifisering van beeldoriëntasie deur
middel van Support Vector Machines (SVM's). SVM's kan kenmerkruimtes van 'n hoë dimensie
hanteer en kan automaties die mees belangrike kenmerke vir klassifikasie kies. Ons vors die gebruik
van verskeie kerne, insluitende RBF-kerne, na. Ons vergelyk die klassifiseringsresultate van SVM's
met die van multilaagperseptrone en 'n Bayes-klassifiseerder. Ons bewys dat SVM's beter resultate
gee as beide van hierdie metodes vir die klassifikasie van individuele beelde. Ons implementeer ook
a toepassing vir die klassifisering van rolle film in a fotografiese werkvloei-omgewing met 100%
klassifikasie akuraatheid.
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Vector processor services for local area networksThomas, Scott D. 31 October 2009 (has links)
Vector processors conventionally have been used as an attached processor to a host computer. Within this limited scope, the application programmer must use the host computer in order to benefit from the vector processor resources. By using a local area network, programmers are no longer constrained to a specific host computer. The vector processor may be shared as a network resource.
The vector processor service is developed within a distributed environment and, therefore, must address concerns pertinent to distributed system architecture. These issues include implementation methodologies, interprocess communication performance, protocol processing and network throughput, and the level of transparency of the implementations. This thesis presents models that facilitate implementation of the vector processor service over a local area network (LAN). The research investigates the performance of different interprocess communication techniques and alternative transport protocols, specifically TCP and UDP. Additionally, two LAN technologies are examined for the vector processor service, namely Ethernet and Fiber Data Distributed Interface (FDDI).
Experiments are performed for a batch application using an Ethernet local area network. Simulations are done for a real-time application utilizing an Ethernet LAN as well as for the same batch application. Additionally, a FDDI local area network is simulated for a real-time application. Results indicate that the model based on remote program execution has better performance because of lower network communication overhead compared to the model based on remote procedure calls. However, the remote procedure call model provides for a more transparent implementation of the vector processor service. This thesis also discusses methods to improve the performance of the vector processor service, including better implementations and transport protocols, alternative remote procedure call protocols, and new multiprocessor architectures. / Master of Science
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Raster to vector conversion in a local, exact and near optimal mannerCarter, John Andrew January 1991 (has links)
A dissertation submitted to the Faculty of Science, University
of the Witwatersrand, Johannesburg, in partial fulfillment of the
requirements for the degree of Master of Science. Pretoria 1991. / Remote sensing can be used to produce maps of land-cover, but to
be of use to the GIS community these maps must first be
vectorized in an intelligent manner.
Existing algorithms suffer from the defects of being slow, memory
intensive and producing vast quantities of very short vectors.
Furthermore if these vectors are thinned via standard algorithms,
errors are introduced.
The process of vectorizing raster maps is subject to major
ambiguities. Thus an infinite family of vector maps ccrresponds
to each raster map. This dissertation presents an algorithm for
converting raster maps in a rapid manner to accurate vector maps
with a minimum of vectors.
The algorithm converts raster maps to vector maps using local
information only, (a two by two neighbourhood). the method is
"exact" in the sense that rasterizing the resulting polygons
would produce exactly the same raster map, pixel for pixel.
The method is "near optimal" in that it produces, in a local
sense, that "exacb" vector map having the least number of
vectors.
The program is built around a home-grown object oriented
Programming System (OOPS) for the C programming language. The
main features of the OOPS system, (called OopCdaisy), are virtual
and static methods, polymorphism, generalized containers,
container indices and thorough error checking, The following
general purpose objects are implemented with a large number of
sophistiated methods :- Stacks, LIFO lists, scannable containers
with indices, trees and 2D objects like points, lines etc. / AC2017
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Image indexing and retrieval based on vector quantizationTeng, Shyh Wei, 1973- January 2003 (has links)
Abstract not available
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A 5 GHz BiCMOS I/Q VCO with 360° variable phase outputs using the vector sum methodOpperman, Tjaart Adriaan Kruger. January 2009 (has links)
Thesis (M.Eng.(Microelectronic Engineering))--University of Pretoria, 2009. / Includes summaries in Afrikaans and English. Includes bibliographical references (leaves [74]-78). Mode of access: World Wide Web.
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A parallel/vector Monte Carlo MESFET model for shared memory machinesHuster, Carl R. 29 July 1992 (has links)
The parallelization and vectorization of Monte Carlo algorithms for modelling
charge transport in semiconductor devices are considered. The standard ensemble
Monte Carlo simulation of a three parabolic band model for GaAs is first
presented as partial verification of the simulation. The model includes scattering
due to acoustic, polar-optical and intervalley phonons. This ensemble simulation
is extended to a full device simulation by the addition of real-space positions, and
solution for the electrostatic potential from the charge density distribution using
Poisson's equation. Poisson's equation was solved using the cloud-in-cell scheme
for charge assignment, finite differences for spatial discretization, and simultaneous
over-relaxation for solution. The particle movement (acceleration and scattering)
and the solution of Poisson's are both separately parallelized. The parallelization
techniques used in both parts are based on the use of semaphores for the protection
of shared resources and processor synchronization. The speed increase results for
parallelization with and without vectorization on the Ardent Titan II are presented.
The results show saturation due to memory access limitations at a speed increase of
approximately 3.3 times the serial case when four processors are used. Vectorization
alone provides a speed increase of approximately 1.6 times when compared with the
nonvectorized serial case. It is concluded that the speed increase achieved with
the Titan II is limited by memory access considerations and that this limitation is
likely to plague shared memory machines for the forseeable future. For the program
presented here, vectorization is concluded to provide a better speed increase
per day of development time than parallelization. However, when vectorization is
used in conjunction with parallelization, the speed increase due to vectorization is
negligible. / Graduation date: 1993
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Modelo reduzido de linhas de transmissão para transitorios eletromagneticos : aplicação de propriedades complexas / Condensed transmission line model to electromagnetic transient phenomena : use of complex propertiesPaz, Marcos de Araujo 18 November 2005 (has links)
Orientador: Maria Cristina Dias Tavares / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e Computação / Made available in DSpace on 2018-08-07T13:37:43Z (GMT). No. of bitstreams: 1
Paz_MarcosdeAraujo_D.pdf: 6127820 bytes, checksum: 21f6dc485bcf097846769f086c2362ad (MD5)
Previous issue date: 2005 / Resumo: O objetivo deste trabalho é contribuir para o estudo de linhas de transmissão e o desenvolvimento de modelos de linhas voltados a programas do tipo EMTP. O trabalho desenvolvido consiste em aproveitar as propriedades e semelhanças dos modos não homopolares de propagação das linhas de transmissão, sejam elas idealmente transpostas ou que apresentem plano de simetria vertical. Por meio de manipulações da matriz de transformação fase-modo-fase através do uso de vetores ortogonais e elementos complexos no domínio modal, pode-se reduzir a dimensão dos vetores de estado. O procedimento proposto é direcionado às modelagens que utilizam transformação fase-modo-fase na determinação das variáveis de estado (corrente e tensão) nas linhas de transmissão. Os recursos usados levam a uma redução tanto em número de operações por iteração quanto em alocação de estados, otimizando o procedimento de cá1culo e aumentando a velocidade de simulação no processamento. A economia computacional que o procedimento proposto proporciona pode ser usada em ferramentas de simulação em tempo real / Abstract: The research objective is to contribute with the study of the transmission line and the development of line models in EMTP-type programs. The proposed model takes advantage of some similarities between non homopolar modes, applying orthogonal vectors and complex number theory to manipulate the state vectors in modal domain reducing the state vectors dimension. The proposed procedure is aimed to the modelling that use phase-mode-phase transformation in the determination of state variables (current and voltage) in transmission lines. The resources used lead to a reduction both in the number of operations per iteration and state allocation, optimizing the procedure and increasing the processing simulation speed. The computational economy, which the proposed procedure provide, can be applied to real-time simulation tools / Doutorado / Energia Eletrica / Doutor em Engenharia Elétrica
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