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Electronic transmission of chemical occurrence data - development of mobile application for sample collection

Pereira, João Paulo Silva
Fonte: Instituto Politécnico de Leiria Publicador: Instituto Politécnico de Leiria
Tipo: Dissertação de Mestrado
Publicado em //2013 POR
Relevância na Pesquisa
27.19%
Dissertação apresentado à Escola Superior de Tecnologia e Gestão do IPL para obtenção do grau de Mestre em Engenharia Informática - Computação Móvel, orientada pelo Doutor Vítor Manuel Basto Fernandes.; A EFSA é um organismo da União Europeia (UE) que visa fornecer pareceres científicos sobre a segurança alimentar. De um modo geral, a EFSA tem como objetivo proceder à recolha e análise de dados que permitam a caracterização e o controlo dos riscos, com impacto direto ou indireto na segurança dos géneros alimentícios e dos alimentos para animais. De modo a facilitar a gestão destes dados, a EFSA desenvolveu um modelo para a transmissão de dados designado por Standard Sample Description (SSD). Este modelo contempla um conjunto de normas e regras de validação de dados, que terão de ser cumpridas pelos Estados-membros antes da transmissão dos dados à EFSA. Este documento apresenta o estudo e os desenvolvimentos efetuados no âmbito do projeto “Implementation of Electronic Transmission of Chemical Occurrence Data in Portugal - (CFP/EFSA/DATEX2011/01)” para a transmissão eletrónica de dados de Portugal, referentes à presença de contaminantes químicos nos alimentos. Começou-se por analisar os sistemas implementados por alguns países da Comunidade Europeia...

SSD RB - sistema de suporte a decisão proposto para a gestão quali-quantitativa dos processos de outorga e cobrança pelo uso da água. ; Decision Support System to help with the implementation of water quality and quantity management mechanisms such as the analysis of authorization of water uses (permits) and water charging.

Rodrigues, Roberta Baptista
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 10/05/2005 PT
Relevância na Pesquisa
27.47%
O presente trabalho apresenta-se como um marco inovador na área de gestão de recursos hídricos, já que o mesmo consegue inserir aspectos de qualidade da água para os processos de outorga e cobrança pelo uso da água, de forma articulada a todos os instrumentos da Política Nacional de Recursos Hídricos (Lei 9.433 de 1997), possibilitando a efetiva aplicação da Política e da Resolução n° 48, de 21 de março de 2005, que estabelece critérios gerais para a cobrança pelo uso dos recursos hídricos. Traz também para a Política um novo conceito, o de Justiça Hídrica, ou seja, quem capta água com qualidade superior paga mais do que quem capta água com qualidade inferior, assim como, quem mais polui e prejudica os usuários de jusante, mais paga. Neste trabalho, a variável de decisão do sistema é o volume outorgado e o estudo leva em consideração a capacidade de autodepuração, o enquadramento em classes de uso, o regime de vazão do corpo hídrico, a qualidade da água captada e os prejuízos, em termos de qualidade da água, ocasionados pelos usuários-poluidores aos usuários de jusante. A ferramenta de auxílio aqui oferecida é um Sistema de Suporte a Decisão (SSD), denominado RB, que apresenta: um módulo Interface...

Riverhelp!: sistema de suporte a decisões para planejamento e gerenciamento integrado de recursos hídricos; Riverhelp!: decision suport system for integrated water resources planning and management

Lima, Guilherme de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 31/08/2007 PT
Relevância na Pesquisa
27.56%
Esta pesquisa apresenta um sistema de suporte a decisão (SSD) para o planejamento e gerenciamento integrado de bacias hidrográficas, denominado Riverhelp!, e também sugere nova metodologia para o uso desse tipo de ferramenta de análise. O objetivo geral é desenvolver um SSD que possa auxiliar a gestão de recursos hídricos. Para isso o SSD utiliza e integra tecnologias avançadas em um só sistema computacional flexível e que pode ser utilizado e entendido por especialistas e outros participantes do processo decisório. O programa é composto por quatro módulos principais e tem código aberto baseado na tecnologia OpenMI o que permite aos usuários alterar e incluir funções. Outra propriedade que merece destaque é sua completa integração com um sistema de informações geográficas permitindo a análise temporal e espacial da bacia hidrográfica. Essa ferramenta pode, por exemplo, ser usada para análises de disponibilidade de água em quantidade e qualidade, para o estudo de ecossistemas, para a otimização e operação de reservatórios e para auxiliar no processo de outorga de direito de uso da água. Uma aplicação do Riverhelp! para as bacias hidrográficas dos rios Piracicaba, Capivari e Jundiaí ilustra as diversas possibilidades de uso do sistema. Os resultados dessa investigação reforçam a importância e a necessidade de uma nova geração de SSD que considerem e analisem de maneira integrada os complexos assuntos relacionados à gestão da bacia hidrográfica. O desenvolvimento do Riverhelp! contribui significativamente para o avanço das pesquisas relacionadas ao tema de planejamento e gerenciamento integrado de recursos hídricos fornecendo um SSD com características únicas...

Eficiência de métodos de melhoramento para teor de fibra e produtividade de grãos em progênies de feijoeiro comum

Silva,Adélia Cristina Fernandes; Melo,Patrícia Guimarães Santos; Melo,Leonardo Cunha; Bassinello,Priscila Zaczuk; Pereira,Helton Santos
Fonte: Instituto Agronômico de Campinas Publicador: Instituto Agronômico de Campinas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2013 PT
Relevância na Pesquisa
27.19%
O objetivo deste estudo foi comparar métodos de melhoramento quanto à variabilidade genética e à eficiência na obtenção de progênies superiores para teor de fibra bruta e produtividade de grãos em feijoeiro comum. As progênies foram obtidas do cruzamento, em 2003, entre as linhagens carioca CNFC 7812 e CNFC 7829. A população segregante foi conduzida por bulk, bulk dentro de F2 e SSD até geração F7. Em 2008 foram amostradas aleatoriamente 64 progênies de cada método para avaliação em Goiás e Paraná. Foram obtidas as estimativas dos componentes de variância, parâmetros genéticos e fenotípicos, média e índices de geração de progênies superiores. As progênies obtidas pelos métodos de bulk e SSD apresentaram diferenças significativas para produtividade e teor de fibra bruta e maior variância genética. O bulk dentro de F2 apresentou os maiores índices de geração de progênies superiores e maiores médias para os dois caracteres, sendo recomendado para os programas de melhoramento de feijoeiro comum.

Outcomes of intracorporeal lithotripsy of upper tract stones is not affected by BMI and skin-to-stone distance (SSD) in obese and morbid patients

Pompeo,Alexandre; Molina,Wilson R.; Juliano,Cesar; Sehrt,David; Kim,Fernando J.
Fonte: Sociedade Brasileira de Urologia Publicador: Sociedade Brasileira de Urologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2013 EN
Relevância na Pesquisa
27.67%
Purpose The purpose of this study is to determine if body mass index (BMI) and stone skin distance (SSD) affect stone free rate (SFR) in obese and morbid obese patients who underwent flexible URS for proximal ureteral or renal stones < 20 mm. Materials and Methods A retrospective chart review was performed of consecutive patients that underwent flexible URS. Inclusion criteria were: proximal ureteral stones and renal stones less than 20 mm in the preoperative computed tomography (CT). SFR were then compared according to SSD and BMI. Results A total of 153 patients were eligible for this analysis, 49 (32.02%) with SSD < 10 cm and 104 (67.97%) with SSD ≥ 10 cm. The mean stone size was 10.5 ± 6.4 mm. The overall SFR in our study was 82.4%. The SFR for the SSD < 10 and ≥ 10 were 79.6% and 83.7% respectively (p = 0.698) and for BMI < 30, ≥ 30 and < 40 and ≥ 40 were 82.9%, 81.7% and 90.9% respectively. Regression analysis showed no affect between BMI or SSD regarding SFR. Conclusion Ureteroscopy should be considered as a first-line of treatment for renal/proximal stones in obese and morbid obese patients. URS may be preferable to SWL in obese patients independently of the SSD, BMI or the location of proximal stones.

The Cpx proteins of Escherichia coli K-12: evidence that cpxA, ecfB, ssd, and eup mutations all identify the same gene.

Rainwater, S; Silverman, P M
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /05/1990 EN
Relevância na Pesquisa
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An existing cpxA(Ts) mutant was resistant to amikacin at levels that inhibited completely the growth of a cpxA+ and a cpxA deletion strain and failed to grow as efficiently on exogenous proline. These properties are similar to those of mutants altered in a gene mapped to the cpxA locus and variously designated as ecfB, ssd, and eup. The amikacin resistance phenotype of the cpxA mutant was inseparable by recombination from the cpxA mutant phenotype (inability to grow at 41 degrees C without exogenous isoleucine and valine) and was recessive to the cpxA+ allele of a recombinant plasmid. Using methods that ensured independent mutations in the cpxA region of the chromosome, we isolated six new amikacin-resistant mutants following nitrosoguanidine mutagenesis. Three-factor crosses mapped the mutations to the cpxA locus. When transferred by P1 transduction to a cpxB11 Hfr strain, each of the mutations conferred the Tra- and Ilv- phenotypes characteristic of earlier cpxA mutants. Two of the new mutations led to a significantly impaired ability to utilize exogenous proline, and four led to partial resistance to colicin A. Two of the new cpxA alleles were recessive to the cpxA+ allele, and four were dominant, albeit to different degrees. On the basis of these data...

The Sterol-sensing Domain (SSD) Directly Mediates Signal-regulated Endoplasmic Reticulum-associated Degradation (ERAD) of 3-Hydroxy-3-methylglutaryl (HMG)-CoA Reductase Isozyme Hmg2*

Theesfeld, Chandra L.; Pourmand, Deeba; Davis, Talib; Garza, Renee M.; Hampton, Randolph Y.
Fonte: American Society for Biochemistry and Molecular Biology Publicador: American Society for Biochemistry and Molecular Biology
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.67%
The sterol-sensing domain (SSD) is a conserved motif in membrane proteins responsible for sterol regulation. Mammalian proteins SREBP cleavage-activating protein (SCAP) and HMG-CoA reductase (HMGR) both possess SSDs required for feedback regulation of sterol-related genes and sterol synthetic rate. Although these two SSD proteins clearly sense sterols, the range of signals detected by this eukaryotic motif is not clear. The yeast HMG-CoA reductase isozyme Hmg2, like its mammalian counterpart, undergoes endoplasmic reticulum (ER)-associated degradation that is subject to feedback control by the sterol pathway. The primary degradation signal for yeast Hmg2 degradation is the 20-carbon isoprene geranylgeranyl pyrophosphate, rather than a sterol. Nevertheless, the Hmg2 protein possesses an SSD, leading us to test its role in feedback control of Hmg2 stability. We mutated highly conserved SSD residues of Hmg2 and evaluated regulated degradation. Our results indicated that the SSD was required for sterol pathway signals to stimulate Hmg2 ER-associated degradation and was employed for detection of both geranylgeranyl pyrophosphate and a secondary oxysterol signal. Our data further indicate that the SSD allows a signal-dependent structural change in Hmg2 that promotes entry into the ER degradation pathway. Thus...

Investigations on juvenile fish excluder cum shrimp sorting device (JFE-SSD)

Boopendranath, Menothuparambil Ravunny; Pravin, Puthra; Gibinkumar, Therodath Rajan; Sabu, Sarasan; Madhu, Vettiyattil Ramakrishnan
Fonte: Springer International Publishing Publicador: Springer International Publishing
Tipo: Artigo de Revista Científica
Publicado em 21/06/2013 EN
Relevância na Pesquisa
27.36%
Penaeid shrimp is a major resource in India contributing about 7.4% of the total marine fish landings. They are mostly landed by small mechanized trawlers. Shrimp trawling generates large quantities of bycatch mostly consisting of juvenile fishes, due to use of small mesh size in codends of trawl nets. Juvenile Fish Excluder cum Shrimp Sorting Device (JFE-SSD) is a bycatch reduction device with an in situ sorting mechanism, which replaces the conventional codend in a trawl. The device was designed to catch shrimps and commercially important fish species using a specially designed oval sorting grid with appropriate bar spacing and dual codends. Shrimp sorting efficiency and bycatch exclusion characteristics of JFE-SSD attached to a 29.6 m shrimp trawl, was tested by experimental fishing along the coastal waters off Cochin, India. Out of a total of 317.07 kg of catch encountered in the JFE-SSD installed trawl, 58.22% was retained in lower codend, 17.53% in upper codend and 24.25%, mostly consisting of juveniles and sub-adults of finfishes and shellfishes, was excluded from upper codend. The mean CPUE registered for upper and lower codend were 7.23±1.04 SE and 5.84±0.96 SE kg h-1 respectively. The CPUE of shrimps retained in upper and lower codends were significantly different (Kruskal-Wallis test (1...

ReHypar: A Recursive Hybrid Chunk Partitioning Method Using NAND-Flash Memory SSD

No, Jaechun; Park, Sung-Soon; Lim, Cheol-Su
Fonte: Hindawi Publishing Corporation Publicador: Hindawi Publishing Corporation
Tipo: Artigo de Revista Científica
EN
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27.67%
Due to the rapid development of flash memory, SSD is considered to be the replacement of HDD in the storage market. Although SSD retains several promising characteristics, such as high random I/O performance and nonvolatility, its high expense per capacity is the main obstacle in replacing HDD in all storage solutions. An alternative is to provide a hybrid structure where a small portion of SSD address space is combined with the much larger HDD address space. In such a structure, maximizing the space utilization of SSD in a cost-effective way is extremely important to generate high I/O performance. We developed ReHypar (recursive hybrid chunk partitioning) that enables improving the space utilization of SSD in the hybrid structure. The first objective of ReHypar is to mitigate the fragmentation overhead of SSD address space, by reusing the remaining free space of I/O units as much as possible. Furthermore, ReHypar allows defining several, logical data sections in SSD address space, with each of those sections being configured with the different I/O unit. We integrated ReHypar with ext2 and ext4 and evaluated it using two public benchmarks including IOzone and Postmark.

Desempenho de famílias de feijoeiro comum obtidas por diferentes métodos de condução de populações segregantes.; Performance of families of common bean obtained by different methods for conducting.

SILVA, Adélia Cristina Fernandes
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Agronomia; Ciências Agrárias Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Agronomia; Ciências Agrárias
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
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The common bean (Phaseolus vulgaris L.) stands out in Brazil because of its economic and, above all social importance, being an essential source of fiber of the human daily diet. To quantify the fiber content and the genetic variability in Brazilian genotypes is very important because it can ensure the success of breeding programs, evaluating the relative efficiency of the methods for conducting segregating populations. The objective of this research was to compare the genetic potential of segregating populations of the common bean submitted to different breeding methods for the character of crude fiber content and grain yield. Families were obtained by hybridization between the lines CNFC 7812 and CNFC 7829 with 12.7% and 17% of fiber content respectively. The families were conducted by three different breeding methods: Bulk, Bulk within F2 and SSD until the F7 generation. The design to analyze the families was the 14x14 lattice with three replications, conducted in two locations: Santo Antonio/GO and Ponta Grossa/PR. The crude fiber content and grain yield were evaluated in all families from the three methods. The components of variance, genetic and phenotypical parameters were then estimated from the mean square expected values. Based on the results...

Eficiência de métodos de condução de população segregante de feijoeiro comum para teor de proteína.; Efficiency evaluation of conducting methods for segregant population of common bean by the protein meaning

SILVA, Gláucio Freitas Oliveira e
Fonte: Universidade Federal de Goiás; BR; UFG; Mestrado em Agronomia; Ciências Agrárias Publicador: Universidade Federal de Goiás; BR; UFG; Mestrado em Agronomia; Ciências Agrárias
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
27.56%
The common bean (Phaseolus vulgaris L.) is part of the daily diet of more than 300 million people worldwide, being an essential food for low income human populations, since it is a cheaper protein source. The beans protein content can be improved by breeding programs since the existence of genetic variability for this character can be explored. It is important to have the relative efficiency of the available methods evaluated. The objective of this research was to evaluate the genetic potential for protein content of segregant populations of common beans submitted to different breeding methods and evaluate the potential of the populations of the bulk method inside F2 families for the traits yield and flowering. The parental utilized in this study was from the bean group carioca , CNFC 7812 with 23% of total protein content and CNFC 8056 with 23% of total protein content. Starting with the F1 generation, was obtained the segregant population F2, witch were selected 150 plants wich families was utilized to produce the populations by three methods: Bulk, Bulk within of F2 and SSD method until the F5 generation. The average protein content of the families obtained by this cross was 16,58% for the method SSD, 20,37% for the method Bulk e 20...

New techniques to model energy-aware I/O architectures based on SSD and hard disk drives

Prada Camacho, Laura
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: Tese de Doutorado Formato: application/pdf
ENG
Relevância na Pesquisa
37.67%
For years, performance improvements at the computer I/O subsystem and at other subsystems have advanced at their own pace, being less the improvements at the I/O subsystem, and making the overall system speed dependant of the I/O subsystem speed. One of the main factors for this imbalance is the inherent nature of disk drives, which has allowed big advances in disk densities, but not so many in disk performance. Thus, to improve I/O subsystem performance, disk drives have become a goal of study for many researchers, having to use, in some cases, different kind of models. Other research studies aim to improve I/O subsystem performance by tuning more abstract I/O levels. Since disk drives lay behind those levels, real disk drives or just models need to be used. One of the most common techniques to evaluate the performance of a computer I/O subsystem is found on detailed simulation models including specific features of storage devices like disk geometry, zone splitting, caching, read-ahead buffers and request reordering. However, as soon as a new technological innovation is added, those models need to be reworked to include new characteristics, making difficult to have general models up to date. Our alternative is modeling a storage device as a black-box probabilistic model...

Seleção para aumento de produtividade e qualidade de frutos em abobrinha 'Piramoita' comparando dois métodos de melhoramento

Cardoso,Antonio Ismael Inácio
Fonte: Instituto Agronômico de Campinas Publicador: Instituto Agronômico de Campinas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2007 PT
Relevância na Pesquisa
27.74%
Este trabalho teve por objetivo comparar dois métodos de melhoramento quanto à seleção visando ao aumento de produtividade e qualidade de frutos na cv. Piramoita. Foram realizados três ciclos de seleção recorrente, com seleção de progênies autofecundadas (S1) e recombinação das melhores progênies para obtenção das populações melhoradas no primeiro (SR-1), segundo (SR-2) e terceiro (SR-3) ciclos. No método do "Single Seed Descent" (SSD) as plantas foram autofecundadas por cinco gerações até a obtenção e avaliação de progênies S5. As nove melhores progênies foram selecionadas obtendo-se progênies endogâmicas selecionadas (SSD-1 a SSD-9) e essas progênies também foram intercruzadas para se obter a população P-SSD. Todas as populações obtidas (SR-1, SR-2, SR-3, P-SSD, SSD-1 a SSD-9), juntamente com a população original (cv. Piramoita), totalizando 14 tratamentos, foram avaliadas em um experimento em blocos ao acaso, com seis repetições e cinco plantas por parcela. As características avaliadas foram: produção de frutos (número e massa) total e comercial, massa média de fruto comercial e taxa de frutos comerciais. Foram obtidos aumentos crescentes de produção de frutos comerciais com os ciclos de seleção recorrente...

Recuperação de dados em sistema de arquivos HFS+ com SSD

ALVES, PEDRO NEIVA
Fonte: Universidade Católica de Brasília Publicador: Universidade Católica de Brasília
Tipo: Trabalho de Conclusão de Curso Formato: Texto
PT_BR
Relevância na Pesquisa
37.36%
São muitos os ramos da perícia digital e muitos são os ramos de atuação do perito digital. Uma sequência padrão de procedimentos de perícia digital é: identificação, preservação, extração, análise e formalização. Esse Artigo Técnico detalhou especificamente as etapas de extração de dados em dispositivos com sistema de arquivos HFS+ e que possuam SSD como meio de armazenamento. Foi realizada uma pesquisa bibliográfica para embasar um estudo de caso, na forma de pesquisa laboratorial, com ferramentas forense livres: The Sleuth Kit e Foremost, pois essas ferramentas utilizam formas diferentes de recuperação de dados. Ao final, foram apresentados resultados e o porquê essas ferramentas não são ideais ao Perito Forense, para o processo de recuperação de dados em sistema de arquivos HFS+ com SSD.; Perícia Digital; Universidade Católica de Brasília – UCB.

Bimodal Accretion Disks: SSD-ADAF Transitions

Gu, Wei-Min; Lu, Ju-Fu
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 21/08/2000
Relevância na Pesquisa
27.36%
We show that, unlike the results presented previously in the literature, the transition from an outer Shakura-Sunyaev disk (SSD) to an advection-dominated accretion flow (ADAF) is possible for large values of the viscosity parameter $\alpha >0.5$. The transition is triggered by thermal instability of a radiation-pressure-supported SSD. The transition radius is close to the central black hole. We confirm our qualitative prediction by actually constructing global bimodal SSD-ADAF solutions.; Comment: 12 pages, 3 figures, accepted by ApJ Letter

EagleTree: Exploring the Design Space of SSD-Based Algorithms

Dayan, Niv; Svendsen, Martin Kjaer; Bjorling, Matias; Bonnet, Philippe; Bouganim, Luc
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 24/01/2014
Relevância na Pesquisa
27.62%
Solid State Drives (SSDs) are a moving target for system designers: they are black boxes, their internals are undocumented, and their performance characteristics vary across models. There is no appropriate analytical model and experimenting with commercial SSDs is cumbersome, as it requires a careful experimental methodology to ensure repeatability. Worse, performance results obtained on a given SSD cannot be generalized. Overall, it is impossible to explore how a given algorithm, say a hash join or LSM-tree insertions, leverages the intrinsic parallelism of a modern SSD, or how a slight change in the internals of an SSD would impact its overall performance. In this paper, we propose a new SSD simulation framework, named EagleTree, which addresses these problems, and enables a principled study of SSD-Based algorithms. The demonstration scenario illustrates the design space for algorithms based on an SSD-based IO stack, and shows how researchers and practitioners can use EagleTree to perform tractable explorations of this complex design space.; Comment: 39th International Conference on Very Large Data Bases (VLDB) (2013)

The STAR Silicon Strip Detector (SSD)

Arnold, L.; Baudot, J.; Bonnet, D.; Boucham, A.; Bouvier, S.; Castillo, J.; Coffin, J. P.; Drancourt, C.; Erazmus, B.; Gaudichet, L.; Germain, M.; Gojak, C.; Grabski, J.; Guilloux, G.; Guedon, M.; Hippolyte, B.; Janik, M.; Kisiel, A.; Kuhn, C.; Lakehal-Ay
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 18/11/2002
Relevância na Pesquisa
27.36%
The STAR Silicon Strip Detector (SSD) completes the three layers of the Silicon Vertex Tracker (SVT) to make an inner tracking system located inside the Time Projection Chamber (TPC). This additional fourth layer provides two dimensional hit position and energy loss measurements for charged particles, improving the extrapolation of TPC tracks through SVT hits. To match the high multiplicity of central Au+Au collisions at RHIC the double sided silicon strip technology was chosen which makes the SSD a half million channels detector. Dedicated electronics have been designed for both readout and control. Also a novel technique of bonding, the Tape Automated Bonding (TAB), was used to fullfill the large number of bounds to be done. All aspects of the SSD are shortly described here and test performances of produced detection modules as well as simulated results on hit reconstruction are given.; Comment: 11 pages, 8 figures, 1 table

Optimize Unsynchronized Garbage Collection in an SSD Array

Zheng, Da; Burns, Randal; Szalay, Alexander S.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 24/06/2015
Relevância na Pesquisa
27.36%
Solid state disks (SSDs) have advanced to outperform traditional hard drives significantly in both random reads and writes. However, heavy random writes trigger fre- quent garbage collection and decrease the performance of SSDs. In an SSD array, garbage collection of individ- ual SSDs is not synchronized, leading to underutilization of some of the SSDs. We propose a software solution to tackle the unsyn- chronized garbage collection in an SSD array installed in a host bus adaptor (HBA), where individual SSDs are exposed to an operating system. We maintain a long I/O queue for each SSD and flush dirty pages intelligently to fill the long I/O queues so that we hide the performance imbalance among SSDs even when there are few parallel application writes. We further define a policy of select- ing dirty pages to flush and a policy of taking out stale flush requests to reduce the amount of data written to SSDs. We evaluate our solution in a real system. Experi- ments show that our solution fully utilizes all SSDs in an array under random write-heavy workloads. It improves I/O throughput by up to 62% under random workloads of mixed reads and writes when SSDs are under active garbage collection. It causes little extra data writeback and increases the cache hit rate.

MOSAIC_SSD: a new web-tool for the Species Sensitivity Distribution, allowing to include censored data by maximum likelihood

King, Guillaume Kon Kam; Veber, Philippe; Charles, Sandrine; Delignette-Muller, Marie Laure
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
27.62%
Censored data are seldom taken into account in Species Sensitivity Distribution (SSD) analysis. However, they are found in virtually every dataset and sometimes represent the better part of the data. Stringent recommendations on data quality often lead to discard a lot of this meaningful data, often resulting in datasets of reduced size, which lack representativeness of any realistic community. However, it is reasonably simple to include censored data into SSD by using an extension of the standard maximum likelihood method. In this paper, we detail this approach based on the use of the R-package \emph{fitdistrplus}, dedicated to the fit of parametric probability distributions. In particular, we introduce the new web-tool MOSAIC$\_$SSD to fit an SSD on datasets containing any kind of data, censored or not. MOSAIC$\_$SSD allows predicting any Hazardous Concentration (HC) and provides in addition bootstrap confidence intervals on the prediction. In the end, taking examples from published data, we illustrate the added value of including censored data in SSD.; Comment: 26 pages, 2 figures

SSD: Single Shot MultiBox Detector

Liu, Wei; Anguelov, Dragomir; Erhan, Dumitru; Szegedy, Christian; Reed, Scott
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 07/12/2015
Relevância na Pesquisa
27.56%
We present a method for detecting objects in images using a single deep neural network. Our approach, named SSD, discretizes the output space of bounding boxes into a set of bounding box priors over different aspect ratios and scales per feature map location. At prediction time, the network generates confidences that each prior corresponds to objects of interest and produces adjustments to the prior to better match the object shape. Additionally, the network combines predictions from multiple feature maps with different resolutions to naturally handle objects of various sizes. Our SSD model is simple relative to methods that requires object proposals, such as R-CNN and MultiBox, because it completely discards the proposal generation step and encapsulates all the computation in a single network. This makes SSD easy to train and straightforward to integrate into systems that require a detection component. Experimental results on ILSVRC DET and PASCAL VOC dataset confirm that SSD has comparable performance with methods that utilize an additional object proposal step and yet is 100-1000x faster. Compared to other single stage methods, SSD has similar or better performance, while providing a unified framework for both training and inference.