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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

AN ONBOARD PROCESSOR FOR FLIGHT TEST DATA ACQUISITION SYSTEMS

Wegener, John A., Blase, Gordon A. 10 1900 (has links)
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Today’s flight test programs are experiencing increasing demands for a greater number of high-rate digital parameters, competition for spectrum space, and a need for operational flexibility in flight test instrumentation. These demands must be met while meeting schedule and budget constraints. To address these various needs, the Boeing Integrated Defense System (IDS) Flight Test Instrumentation group in St. Louis has developed an onboard processing capability for use with airborne instrumentation data collection systems. This includes a first-generation Onboard Processor (OBP) which has been successfully used on the F/A-18E/F Super Hornet flight test program for four years, and which provides a throughput of 5 Mbytes/s and a processing capability of 480 Mflops (floating-point operations per second). Boeing IDS Flight Test is also currently developing a second generation OBP which features greatly enhanced input and output flexibility and algorithm programmability, and is targeted to provide a throughput of 160 Mbytes/s with a processing capability of 16 Gflops. This paper describes these onboard processing capabilities and their benefits.
2

Hierarquia de memória configurável para redução energética no codificador de vídeo HEVC / Configurable memory hierarchy for energy reduction in HEVC video encoder

Martins, Anderson da Silva 29 September 2017 (has links)
Submitted by Aline Batista (alinehb.ufpel@gmail.com) on 2018-04-18T14:40:46Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertacao_Anderson_Martins.pdf: 8654389 bytes, checksum: f6e25bd57867fb8466bfe88dcf25afb3 (MD5) / Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2018-04-19T14:42:52Z (GMT) No. of bitstreams: 2 Dissertacao_Anderson_Martins.pdf: 8654389 bytes, checksum: f6e25bd57867fb8466bfe88dcf25afb3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-04-19T14:43:00Z (GMT). No. of bitstreams: 2 Dissertacao_Anderson_Martins.pdf: 8654389 bytes, checksum: f6e25bd57867fb8466bfe88dcf25afb3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-09-29 / Sem bolsa / Dados recentes mostram que há uma demanda crescente de aplicações de vídeo em dispositivos móveis, sendo este um grande desafio para pesquisas em arquiteturas de codificadores de vídeo de alto desempenho como o padrão HEVC. Em um sistema embarcado o consumo de energia e o desempenho estão diretamente ligados ao sistema de memória. No codificador de vídeo não é diferente, e no HEVC a etapa de estimação de movimento (ME) é conhecida por ser responsável pela maior parte do tempo de processamento e acesso à memória. Portanto, este trabalho apresenta uma exploração do espaço de projeto para definir configurações de memória cache eficientes em energia para o processo da ME e, propor uma hierarquia de memória cache configurável, considerando diferentes sequências de vídeo e configurações do codificador HEVC. A avaliação considerou o algoritmo TZ Search, amplamente utilizado, 23 sequências de vídeo com resoluções distintas e quatro Parâmetros de Quantização (QPs) sob 32 configurações de cache diferentes. Um simulador de cache foi desenvolvido e a ferramenta CACTI foi utilizada para obter parâmetros de tempo e energia. Assim, foi possível identificar configurações de cache ótimas para cada cenário, visto que não existe uma única configuração de memória cache que satisfaça todos os cenários ao mesmo tempo quando o objetivo é redução de energia. Considerando a configuração ótima de cache para cada cenário, o uso de cache pode levar a uma economia de largura de banda da memória externa de até 97,37%, que corresponde a uma redução de 25,48GB/s para 548,53MB/s em um caso. A redução de energia chega a 93,95%, o que corresponde, uma redução de energia de 5,02mJ para 0,30mJ, ao comparar diferentes configurações de cache. Estes resultados possibilitaram propor uma hierarquia de memória cache configurável para o processo de estimação de movimento que é capaz de atender eficientemente todos os cenários testados. Para a arquitetura configurável proposta foram encontradas economia de energia de até 78,09% quando as configurações ótimas são comparadas com o pior caso dentro da cache configurável (16KB-8). Já quando comparada com Level-C, foram alcançadas economia de energia de até 86,91%. Além disso, a economia de largura de banda alcançada ficou entre 90,21% e 96,84% com uma média de 94,97%. / Recent data show that there is a growing demand for video applications on mobile devices, which is a major challenge for research into high performance video encoder architectures such as the HEVC standard. In an embedded system, power consumption and performance are directly connected to the memory system. In the video encoder it is no different, and in the HEVC the motion estimation (ME) step is known to be responsible for most of the processing time and memory access. Therefore, this work presents an exploration of the design space to define energy-efficient cache memory configurations for the ME process and propose a configurable cache memory hierarchy considering different video sequences and HEVC encoder configurations. The evaluation considered the widely used TZ Search algorithm, 23 video sequences with distinct resolutions, and four Quantization Parameters (QPs) under 32 different cache configurations. A cache simulator was developed and the CACTI tool was used to obtain time and energy parameters. Thus, it was possible to identify optimal cache configurations for each scenario, since there is no single cache configuration that satisfies all scenarios at the same time when the goal is to reduce power. Considering the optimal cache configuration for each scenario, cache usage can lead to external memory bandwidth savings of up to 97.37%, which corresponds to a reduction of 25.48GB/s to 548.53MB/s in one case. The energy reduction comes to 93.95%, which corresponds to an energy reduction of 5.02mJ to 0.30mJ when comparing different cache configurations. These results have made it possible to propose a configurable cache memory hierarchy for motion estimation process that is capable of efficiently satisfying all scenarios tested. For the proposed configurable architecture, energy savings of up to 78.09% were found when the optimal configurations were compared to the worst case within the configurable cache (16KB-8). When compared to Level-C, energy savings of up to 86.91% were achieved. In addition, the external memory bandwidth savings achieved was between 90.21% and 96.84% with an average of 94.97%.

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