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Search Results: 1 - 10 of 52234 matches for " Luiz Antonio;Mattos "
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Lagrangean relaxation bounds for point-feature cartographic label placement problem
Ribeiro, Glaydston Mattos;Lorena, Luiz Antonio Nogueira;
Pesquisa Operacional , 2006, DOI: 10.1590/S0101-74382006000300002
Abstract: the objective of the point-feature cartographic label placement problem (pfclp) is to give more legibility to an automatic map creation, placing point labels in clear positions. many researchers consider distinct approaches for pfclp, such as to obtain the maximum number of labeled points that can be placed without overlapping or to obtain the maximum number of labeled points without overlaps considering that all points must be labeled. this paper considers another variant of the problem in which one has to minimize the number of overlaps while all points are labeled in the map. a conflict graph is initially defined and a mathematical formulation of binary integer linear programming is presented. commercial optimization packages could not solve large instances exactly using this formulation over instances proposed in the literature. a heuristic is then examined considering a lagrangean relaxation performed after an initial partition of the conflict graph into clusters. this decomposition allowed us to introduce tight lower and upper bounds for pfclp.
Novos limitantes lagrangeanos para o problema probabilístico de localiza??o-aloca??o de máxima cobertura utilizando grafos de cobertura
Corrêa, Francisco de Assis;Lorena, Luiz Antonio Nogueira;Ribeiro, Glaydston Mattos;
Gest?o & Produ??o , 2009, DOI: 10.1590/S0104-530X2009000200009
Abstract: the probabilistic maximal covering location-allocation problem (pmclap) aims to locate facilities maximizing the number of people served and providing a good level of service. this means that customers would not have to wait longer than the wait time established or to wait in long lines. these parameters are influenced by the number of the requests for service and service time, both probabilistic. the pmclap is np-complete and in this paper we study bounds with a lagrangean relaxation with clusters (lagclus). instead of using a conflict graph to represent a problem, in this paper another strategy for the use of lagclus using a special graph called covering graph is proposed. this approach provides interesting bounds.
Análise comparativa da interven??o coronária percutanea com stents farmacológicos versus stents n?o-farmacológicos na vigência de infarto do miocárdio com supradesnivelamento do segmento ST: dados do Registro Brasileiro CENIC
Devito, Fernando Stucchi;Marin-Neto, José Antonio;Mattos, Luiz Alberto;
Revista Brasileira de Cardiologia Invasiva , 2008, DOI: 10.1590/S2179-83972008000400016
Abstract: background: primary percutaneous coronary interventions (ppci) with drug-eluting stents have incipient and still controversial results in the literature. objective: to compare ppci with drug-eluting and bare-metal stents in brazil during the period 2006-2007. method: all consecutive patients with st-segment elevation myocardial infarction (stemi) treated with ppci with drug-eluting or bare-metal stents, reported to the database of the national center for cardiovascular interventions (cenic) from january 2006 to december 2007, were compared as to their clinical and angiographic characteristics and in-hospital results. results: 4,876 patients treated with ppci were analyzed; 4,674 (95.9%) used bare-metal stents and 202 (4.1%), drug-eluting stents. procedural success rates were higher with drug-eluting stents (97.5% vs. 93.5%; p = 0.02). there were no differences in the rates of stent thrombosis (1.5% vs. 1.3%; p = 0.869) or overall complications (1.0% vs. 2.8%; p = 0.119). mortality tended to be lower with drug-eluting stents (2.0% vs. 4.4%; p = 0.098). conclusion: in brazil, ppci with drug-eluting stents has a low rate of thrombosis and in-hospital mortality, compared to that observed for bare-metal stents in a relatively selected patient population, in which the referral for these stents was certainly influenced by multiple factors, which affected comparative results.
Conflitos éticos e judiciais no emprego dos stents farmacológicos no Brasil: análise das principais controvérsias para incorpora??o dessa tecnologia nos sistemas de saúde público e privado no país
Lopes, Marcelo Ant?nio Cartaxo Queiroga;Lopes Filho, Marcelo Antonio Cartaxo Queiroga;Gubolino, Luiz Antonio;Mattos, Luiz Alberto;Marin-Neto, José Antonio;
Revista Brasileira de Cardiologia Invasiva , 2009, DOI: 10.1590/S2179-83972009000100020
Abstract: drug eluting stents were approved by the agência nacional de vigilancia sanitária (anvisa) in 2002. since then, their regular use in brazil has been restricted, allegedly due to their cost, which is considered high by national health funding agencies. this has led to an extensive series of ethical and legal conflicts, involving patients, physicians and health care plans and providers, which commonly result in lawsuits in the national judiciary system. in this article, we will discuss the various ethical and legal aspects involved in the conflicts, regarding the incorporation of drug eluting stents in brazil. a research of former court decisions on this subject was carried out to support this discussion.
Productivity Monitoring of Land Pipelines Welding via Control Chart Using the Monte Carlo Simulation  [PDF]
Pedro Mattos Tabim, Miguel Luiz Ribeiro Ferreira
Journal of Software Engineering and Applications (JSEA) , 2015, DOI: 10.4236/jsea.2015.810051
Abstract: This article evaluates the efficacy of a tool developed in the Monte Carlo simulation and referred to as control chart. This tool is used in order to detect changes in productivity resulting from the occurrence of a given event during the welding of land pipelines with self shielded flux cored wire (FCAW). The elaboration of this control chart is based on the data from the Cumulative Probability Density Function (CDF) curve, and generated in the Monte Carlo simulation using version 6 of the Palisade Corporation’s @Risk software for Excel, in a sample with productivity data from 29 welded joints, gathered through direct observation which considers the productive and unproductive times. In order to evaluate the control chart efficacy, the performance of welding productivity with a FCAW process with low alloy steels has been assessed during 29 days, summing up to 842 welded joints registered on “Relatórios Diários de Obras” (Construction Works Daily Reports). The results show that the model developed for the control chart elaboration is effective in monitoring the productivity of the observed welding procedure.
Performance of rubella suspect case definition: implications for surveillance
Oliveira,Solange Artimos de; Camacho,Luiz Antonio Bastos; Pereira,Antonio Carlos de Medeiros; Bulh?es,Marília Mattos; Aguas,Angélica Fortes; Siqueira,Marilda Mendon?a;
Revista de Saúde Pública , 2006, DOI: 10.1590/S0034-89102006000300013
Abstract: objective: to assess the performance of the rubella suspect case definition among patients with rash diseases seen at primary care units. methods: from january 1994 to december 2002, patients with acute rash, with or without fever, were seen at two large primary health care units and at a public general hospital in the municipality of niterói, metropolitan area of rio de janeiro, brazil. data from clinical and serologic assessment were used to estimate the positive predictive values of the definition of rubella suspect case from the brazilian ministry of health and other combination of signs/symptoms taking serologic status as the reference. serum samples were tested for anti-rubella virus igm using commercially available enzyme immunoassays. positive predictive values and respective 95% confidence intervals were calculated. results: a total of 1,186 patients with an illness characterized by variable combinations of rash with fever, arthropathy and lymphadenopathy were studied. patients with rash, regardless of other signs and symptoms, had 8.8% likelihood of being igm-positive for rubella. the brazilian suspect case definition (fever and lymphadenopathy in addition to rash) had low predictive value (13.5%). this case definition would correctly identify 42.3% of the igm-positive cases, and misclassify 26.1% of the igm-negative cases. conclusions: these results support the recommendation to investigate and collect clinical specimens for laboratory diagnosis of all cases of rash, for surveillance purposes. although this strategy may increase costs, the benefits of interrupting the circulation of rubella virus and preventing the occurrence of congenital rubella syndrome should pay off.
Dear Dr. Kursaklioglu and colleagues
Mattos Luiz A.
Arquivos Brasileiros de Cardiologia , 2002,
Correla o dos fenótipos ABO, Lewis, secretor e polimorfismo molecular do locus ABO em pacientes infectados e n o infectados pelo Helicobacter pylori
Mattos Luiz Carlos de
Revista Brasileira de Hematologia e Hemoterapia , 2000,
Antígenos ABH-Lewis nos estudos de associa es com doen as
Mattos Luiz Carlos de
Revista Brasileira de Hematologia e Hemoterapia , 2003,
The ADA*2 allele of the adenosine deaminase gene (20q13.11) and recurrent spontaneous abortions: an age-dependent association
Nunes, Daniela Prudente Teixeira;Spegiorin, Lígia Cosentino Junqueira Franco;Mattos, Cinara Cássia Brand?o de;Oliani, Antonio Helio;Vaz-Oliani, Denise Cristina Mós;Mattos, Luiz Carlos de;
Clinics , 2011, DOI: 10.1590/S1807-59322011001100013
Abstract: objective: adenosine deaminase acts on adenosine and deoxyadenosine metabolism and modulates the immune response. the adenosine deaminase g22a polymorphism (20q.11.33) influences the level of adenosine deaminase enzyme expression, which seems to play a key role in maintaining pregnancy. the adenosine deaminase 2 phenotype has been associated with a protective effect against recurrent spontaneous abortions in european caucasian women. the aim of this study was to investigate whether the g22a polymorphism of the adenosine deaminase gene is associated with recurrent spontaneous abortions in brazilian women. methods: a total of 311 women were recruited to form two groups: g1, with a history of recurrent spontaneous abortions (n = 129), and g2, without a history of abortions (n = 182). genomic dna was extracted from peripheral blood with a commercial kit and pcr-rflp analysis was used to identify the g22a genetic polymorphism. fisher's exact test and odds ratio values were used to compare the proportions of adenosine deaminase genotypes and alleles between women with and without a history of recurrent spontaneous abortion (p<0.05). the differences between mean values for categorical data were calculated using unpaired t tests. the hardy-weinberg equilibrium was assessed with a chi-square test. results: statistically significant differences were identified for the frequencies of adenosine deaminase genotypes and alleles between the g1 and g2 groups when adjusted for maternal age. conclusions:the results suggest that the adenosine deaminase *2 allele is associated with a low risk for recurrent spontaneous abortions, but this association is dependent on older age.
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