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Parallel LDPC Decoding on GPUs Using a Stream-Based Computing Approach

Journal of Computer Science & Technology 2009年第5期24卷 913-924页

作者： Gabriel Falcao Student Member Shinichi Yamagiwa vitor silva Leonel Sousa Senior Member Department of Electrical and Computer Engineering University of Coimbra Instituto de Telecomunicacoes PoloⅡUniversidade de Coimbra 3030-290 Coimbra Portugal INESC-ID Technical University of Lisbon Rua Alves Redol n.9 1000-029 Lisboa Portugal Department of Electrical and Computer Engineering IST Technical University of Lisbon Rua Alves Redol n.9 1000-029 Lisboa Portugal

Low-Density Parity-Check （LDPC） codes are powerful error correcting codes adopted by recent communication standards. LDPC decoders are based on belief propagation algorithms, which make use of a Tanner graph and very intensive message-passing computation, and usually require hardware-based dedicated solutions. With the exponential increase of the computational power of commodity graphics processing units （GPUs）, new opportunities have arisen to develop general purpose processing on GPUs. This paper proposes the use of GPUs for implementing flexible and programmable LDPC decoders. A new stream-based approach is proposed, based on compact data structures to represent the Tanner graph. It is shown that such a challenging application for stream-based computing, because of irregular memory access patterns, memory bandwidth and recursive flow control constraints, can be efficiently implemented on GPUs. The proposal was experimentally evaluated by programming LDPC decoders on GPUs using the Caravela platform, a generic interface tool for managing the kernels＇ execution regardless of the GPU manufacturer and operating system. Moreover, to relatively assess the obtained results, we have also implemented LDPC decoders on general purpose processors with Streaming Single Instruction Multiple Data （SIMD） Extensions. Experimental results show that the solution proposed here efficiently decodes several codewords simultaneously, reducing the processing time by one order of magnitude.

关键词： data-parallel computing graphics processing unit (GPU) Caravela low-density parity-check (LDPC) code error correcting code

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A Building Classification System for Multi-hazard Risk Assessment

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International Journal of Disaster Risk Science 2022年第2期13卷 161-177页

作者： vitor silva Svetlana Brzev Charles Scawthorn Catalina Yepes Jamal Dabbeek Helen Crowley Risk Section Global Earthquake Model27100 PaviaItaly Department of Civil Engineering University of British ColumbiaVancouverBC V6T 1Z4Canada SPA Risk LLC DenverCO 80207USA Department of Civil Engineering An-Najah National UniversityNablusState of Palestine Seismic Risk Section 27100 EucentrePaviaItaly

A uniform and comprehensive classification system, often referred to as taxonomy, is fundamental for the characterization of building portfolios for natural hazard risk assessment. A building taxonomy characterizes assets according to attributes that can influence the likelihood of damage due to the effects of natural *** the scope of the Global Earthquake Model(GEM)initiative, a building taxonomy(GEM Building Taxonomy V2.0) was developed with the goal of classifying buildings according to their seismic vulnerability. This taxonomy contained 13 building attributes, including the main material of construction, lateral load-resisting system, date of construction and number of stories. Since its release in2012, the taxonomy has been used by hundreds of experts working on exposure and risk modeling efforts. These applications allowed the identification of several limitations, which led to the improvement and expansion of this taxonomy into a new classification system compatible with multi-hazard risk assessment. This expanded taxonomy(named GED4ALL) includes more attributes and several details relevant for buildings exposed to natural hazards beyond earthquakes. GED4ALL has been applied in several international initiatives, enabling the identification of the most common building classes in the world, and facilitating compatibility between exposure models and databases of vulnerability and damage databases.

关键词： Disaster risk Exposure Multihazard Taxonomy

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Seismic Risk Model for the Beijing-Tianjin-Hebei Region,China:Considering Epistemic Uncertainty from the Seismic Hazard Models

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International Journal of Disaster Risk Science 2024年第3期15卷 434-452页

作者： Jian Ma Katsuichiro Goda Kai Liu silva vitor Anirudh Rao Ming Wang Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationKey Laboratory of Earthquake Disaster MitigationMinistry of Emergency ManagementHarbin150080China School of National Safety and Emergency Management Beijing Normal UniversityBeijing100875China Department of Earth Sciences Western UniversityLondonN6A 5B7Canada Global Earthquake Model Foundation 27100PaviaItaly Shenzhen Key Laboratory of Urban Disasters Digital Twin Shenzhen518023China

This study presents a probabilistic seismic risk model for the Beijing-Tianjin-Hebei region in *** model comprises a township-level residential building exposure model,a vulnerability model derived from the Chinese building taxonomy,and a regional probabilistic seismic hazard *** three components are integrated by a stochastic event-based method of the OpenQuake engine to assess the regional seismic risk in terms of average annual loss and exceedance probability curve at the city,province,and regional *** novelty and uniqueness of this study are that a probabilistic seismic risk model for the Beijing-Tianjin-Hebei region in China is developed by considering the impact of site conditions and epistemic uncertainty from the seismic hazard model.

关键词： Beijing-Tianjin-Hebei region Epistemic uncertainty Seismic risk assessment Seismic risk model

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Alpha-1 antitrypsin deficiency and Pi^(*)Z allele as important co-factors in the development of liver fibrosis

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World Journal of Hepatology 2024年第8期16卷 1099-1110页

作者： Ana Isabel Ferreira Catarina Guimarães vitor Macedo silva Sofia Xavier Joana Magalhães JoséCotter Department of Gastroenterology Hospital da Senhora da Oliveira-GuimarãesGuimarães 4835-044Portugal Life and Health Sciences Research Institute School of MedicineUniversity of MinhoBraga 4710-057Portugal Life and Health Sciences Research Institute/3B’s PT Government Associate LaboratoryBraga 4710-057Portugal Department of Pulmonology Hospital Senhora da Oliveira-GuimarãesGuimarães 4835-044Portugal

BACKGROUND Alpha-1 antitrypsin deficiency(AATD)is a codominant autosomal hereditary condition that predisposes patients to the development of lung and/or liver disease,and Pi*Z allele is the most clinically relevant *** To evaluate the impact of clinical parameters and AATD phenotypes,particularly the Pi*Z allele,in liver *** Cross-sectional cohort study including consecutive patients with AATD followed in Pulmonology or Hepatology *** Included 69 patients,49.3%had Pi*MZ phenotype and 10.1%Pi**** age≥55 years,age at diagnosis≥41 years and AAT at diagnosis<77 mg/dL predicted a nonalcoholic fatty liver disease fibrosis score(NFS)not excluding advanced fibrosis[area under the curve(AUC)=0.840,P<0.001;AUC=0.836,P<0.001;AUC=0.681,P=0.025].An age≥50 years and age at diagnosis≥41 years predicted a fibrosis-4 index of moderate to advanced fibrosis(AUC=0.831,P<0.001;AUC=0.795,P<0.001).Patients with hypertension,type 2 diabetes mellitus(DM),dyslipidaemia,metabolic syndrome,and regular alcohol consumption were more likely to have a NFS not excluding advanced fibrosis(P<0.001,P=0.002,P=0.008,P<0.001,P=0.033).Patients with at least one Pi*Z allele and type 2 DM were 8 times more likely to have liver stiffness measurement≥7.1 kPa(P=0.040).CONCLUSION Risk factors for liver disease in AATD included an age≥50 years,age at diagnosis≥41 years,metabolic risk factors,regular alcohol consumption,at least one Pi*Z allele,and AAT value at diagnosis<77 mg/*** created an algorithm for liver disease screening in AATD patients to use in primary care,selecting those to be referred to Hepatology consultation.

关键词： Alpha-1 antitrypsin deficiency Liver fibrosis Nonalcoholic fatty liver disease fibrosis score Fibrosis-4 index Liver stiffness measurement

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Arabidopsis NahG Plants as a Suitable and Efficient System for Transient Expression using Agrobacte#um tumefaciens

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Molecular Plant 2017年第2期10卷 353-356页

作者： Tábata Rosas-Díaz Pepe Cana-Quijada vitor Amorim-silva Miguel A. Botella Rosa Lozano-Durán Eduardo R. Bejarano Shanghai Center for Plant Stress Biology (PSC) Shanghai Institutes of Biological Sciences Chinese Academy of Sciences Shanghai 201602 China

Dear Editor Research in molecular plant biology has largely benefitted from technologies allowing exogenous gene expression. While the generation of stable transgenic lines is required in some cases, transient transfo... 详细信息

关键词： Suitable Transient tumefaciens

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Arabidopsis Squalene Epoxidase 3 （SQE3） Complements SQE1 and Is Important for Embryo Development and Bulk Squalene Epoxidase Activity

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Molecular Plant 2015年第7期8卷 1090-1102页

作者： Sara Laranjeira vitor Amorim-silva Alicia Esteban Monserrat Arro Albert Ferrer Rui Manuel Tavares Miguel Angel Botella Abel Rosado Herlander Azevedo Center for Biodiversity Functional & Integrative Genomics (BioFIG) Plant Functional Biology Center University of Minho Campus de Gualtar 4710-057 BragaPortugal Instituto de Hortofruticultura Subtropical y Mediterranea 'La Mayora' Universidad de Malaga-Consejo Superior de Investigaciones Cientificas (IHSM-UMA-CSIC)Departmento de Biologia Molecular y Bioquimica Universidad de Malaga Campus Teatinos 29071 Malaga Spain Department of Molecular Genetics Centre for Research in Agricultural Genomics (CSIC-IRTA-UAB-UB) Bellaterra-Cerdanyola del Valles 08193 Spain Department of Biochemistry and Molecular Biology Faculty of Pharmacy University of Barcelona 08028 Barcelona Spain Canada Research Chair in Plant Physiology and Cellular Dynamics Department of Botany Faculty of Sciences University of British Columbia VancouverBC V6T 1Z4 Canada CIBIO InBIO - Research Network in Biodiversity and Evolutionary Biology Universidade do Porto Campus Agrario de Vairao 4485-661 Vairao Portugal

The existence of multigenic families in the mevalonate pathway suggests divergent functional roles for pathway components involved in the biosynthesis of plant sterols. Squalene epoxidases （SQEs） are key components of this pathway, and Squalene Epoxidase 1 （SQE1） has been identified as a fundamental enzyme in this biosynthetic step. In the present work, we extended the characterization of the remaining SQE family members, phylogenetically resolving between true SQEs and a subfamily of SQE-like proteins that is exclusive to Brassicaceae. Functional characterization of true SQE family members, Squalene Epox- idase 2 （SQE2） and Squalene Epoxidase 3 （SQE3）, indicates that SQE3, but not SQE2, contributes to the bulk SQE activity in Arabidopsis, with sqe3-1 mutants accumulating squalene and displaying sensitivity to ter- binafine. We genetically demonstrated that SQE3 seems to play a particularly significant role in embryo development. Also, SQE1 and SQE3 both localize in the endoplasmic reticulum, and SQE3 can functionally complement SQEI. Thus, SQE1 and SQE3 seem to be two functionally unequal redundant genes in the pro- motion of plant SQE activity in Arabidopsis.

关键词： Arabidopsis embryo development MVA pathway squalene epoxidase sterol biosynthesis

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Bibliographical Review on Rehabilitation of Executive Functions in Patients With Developmental Coordination Disorder(DCD)

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Psychology Research 2024年第2期14卷 45-56页

作者： Keiko da Costa Oikawa Fabrício Bruno Cardoso Filipe M.Bonone Samuel Pereira de Souza vitor da silva Loureiro Alfred Sholl-Franco Faculdade Censupeg JoinvilleBrazil Faculdade Censupeg JoinvilleBrazil Universidade Federal do Rio de JaneiroRio de JaneiroBrazil

The present study aims to establish a literature review on intervention programs for executive functions(EFs)through the use of fundamental motor skills,from a neuropsychopedagogical perspective in subjects with Developmental Coordination Disorder(DCD).An exploratory study was carried out through an integrative literature *** research was carried out in the Scientific databases Electronic Library Online(SciELO),Latin American and Caribbean Literature in Health Sciences(LILACS),Virtual Health Library-Psychology Brazil(BVSPSI),Electronic Journals of Psychology(PePSIC),in the periodicals available in the Brazilian Digital Library of Theses and Dissertations(BDTD)and on the website of the Coordination for the Improvement of Higher Education Personnel(CAPES).The covering publications took place from 2018 to 2023,14 articles were selected for *** literature review made it possible to create strategies for stimulating EF and Visuomotor Functions so that educators and other professionals can better deal with students with *** was perceived the need to carry out and develop more empirical research regarding the intervention of EFs and Visuomotor Functions by educators and professionals,with a greater sampling amplitude,to increase the number of studies that enable interventions both in children and in teenagers with DCD.

关键词： developmental coordination disorder executive functions school neuropsychology stimulation of executive functions

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Effects of a Neuropsychopedagogical Parenting Program on the Cognitive and Motor Development of Children with ADHD

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Journal of Behavioral and Brain Science 2022年第10期12卷 485-498页

作者： Luciana De Oliveira Matos Cláudia Inês P. O. Abreu Deizeane Da Costa Abreu Fabrício Bruno Cardoso vitor Da silva Loureiro Laboratory of Educational Innovations and Neuropsychopedagogical Studies (LIEENP) CENSUPEG S&atilde o Fidé lis Brazil

This study aimed to evaluate the effects of a neuropsychopedagogical parenting program (NPP) on the cognitive and motor development of children with ADHD. 70 children with ADHD participated in the present study, of both sexes, aged between 06 and 08 years old (7.08 years old), who were divided into two groups: (A—35 children with ADHD who did not undergo the NPP;B—35 children with ADHD who underwent the NPP). The NPP had a duration of 25 sessions of 15 minutes each, at a frequency of 3 times a week. To evaluate the effects of the NPP, the children were submitted to the following protocols: 1) Swanson, Nolan and Pelham Questionaire (SNAP-IV);2) Assessment of Motor Competence through the Supine-to Stand (STS);3) Assessment of executive functioning through the HEAD-FOOT-KNEE- SHOULDER (HFKS) protocol;4) Assessment of Reading Comprehension. Both groups were evaluated before the NPP, after the NPP and four months after the end of the NPP. Our results show that GB children in the signs/ symptoms evaluated by SNAP-IV had a superior performance by ±11% (p < 0.01) in relation to GA children. Regarding motor competence, the children from GB had a superior performance by ±24% (p < 0.01) in relation to children from GA. When assessed for executive functioning when establishing an intergroup comparison, GB children performed ±23% better (p < 0.01) than GA children. Regarding reading ability, children from (GB) had a superior performance by ±9% (p < 0.05) compared to children from (GA), after undergoing the NPP.

关键词： Children ADHD Parental Program

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Effects of a Neuropsychopedagogical Parenting Program on the Cognitive and Motor Development of Children with ADHD

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Journal of Behavioral and Brain Science 2022年第10期

作者： luciana de oliveira matos cláudia inês p. o. abreu vitor da silva loureiro deizeane da costa abreu fabrício bruno cardoso

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Abiotic stress on seed germination and plant growth of Zeyheria tuberculosa

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Journal of Forestry Research 2023年第5期34卷 1511-1522页

作者： Robson Luis silva de Medeiros Rinaldo Cesar de Paula Joao vitor Oliveira de Souza Joao Pedro Peixoto Fernandes Department of Agricultural Sciences School of Agricultural and Veterinarian SciencesSao Paulo State University(Unesp)14884-900JaboticabalSao PauloBrazil

Zeyheria tuberculosa(Vell.)Bureau ex *** among the Brazilian flora threatened with *** has high-quality wood and can be used to recover herbicidecontaminated ***,abiotic stresses can harm seed germination and seedling development under adverse conditions and need to be understood to improve autochthonous or indigenous biodiversity conservation and strengthen reforestation *** study evaluated the effects of temperature,water and saline stress on *** seed germination and water stress on seedling *** laboratory experiments evaluated germination under:(1)different temperatures(20,25,30,35 and 40℃);(2)different water potentials simulated with polyethylene glycol(PEG6000)at 25 and 30℃;and,(3)different osmotic potentials simulated with NaCl at 25 and 30℃.In addition,a greenhouse experiment subjected seedlings to five water regimes(20%,35%,50%,65%and 80%of maximum substrate water holding capacity).In the laboratory,seedling biometry and germination were evaluated,while physiological and morphological parameters were assessed in the *** potential of seeds increased at 25 and 30℃.Germination and vigor decreased as water and saline stresses *** tolerance thresholds for water and salt stresses were-0.6 and-0.4 MPa,*** the greenhouse,the most restrictive water regimes reduced seedling physiological and morphological *** development was compromised at moisture levels below50%field capacity.

关键词： Bignoniaceae Climate change Ipê-felpudo Ipê-preto Water stress

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