Este trabalho tem como objetivo investigar a redução da relaxação por compressão de borracha acrílica modificada (ACM) irradiada por feixe de elétrons, através da caracterização de seu comportamento mecânico e de sua estrutura molecular. O material, nas condições original e irradiado, foi inicialmente submetido a ensaios uniaxiais de tração e espectroscopia por infravermelho com o objetivo de verificar a influência da irradiação EB em seu comportamento, eliminando a possibilidade de degradação do material, permitindo a continuidade dos estudos. Definidas as doses, novos corpos de prova foram irradiados e submetidos a ensaios uniaxiais, equibiaxiais de tensão e cisalhamento puro, gerando resultados que foram aplicados na simulação pelo método de elementos finitos, utilizando o modelo de comportamento elástico não-linear de Ogden, para predizer o comportamento do material em condições de compressão. Confirmado o aumento da tensão por compressão para mesmas deformações, com o aumento da dose de radiação, análises termogravimétricas e dinâmicas mecânicas foram realizadas para possibilitar o entendimento do fenômeno. Na fase final do trabalho ensaios de relaxação por compressão foram realizados...

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2012.; Nas últimas décadas, a importância dada à imagem transmitida pelos edifícios por meio de suas fachadas levou ao aumento da utilização de panos de vidro associados a revestimentos de alta tecnologia, sendo o ACM (Aluminum composite material) um dos materiais mais utilizados nas fachadas “high-tech”. Devido a fatores como rapidez na execução e possibilidade de instalação sobre outros revestimentos sem necessidade de demolição, o ACM também tem sido muito utilizado em reformas de fachadas. No entanto, 63,31% da massa dos materiais componentes das fachadas com ACM é composta por alumínio, um material cuja produção demanda altas taxas de consumo de energia e emite grande quantidade de CO₂. Dessa forma, sob o ponto de vista energético-ambiental, a reciclagem se apresenta como um importante recurso na busca da sustentabilidade desse tipo de fachada. Por outro lado, existem entraves ao reaproveitamento dos resíduos gerados na etapa de montagem e instalação...

Inactivation by allelic exchange in clinical isolates of the emerging nosocomial pathogen Enterococcus faecium has been hindered by lack of efficient tools, and, in this study, transformation of clinical isolates was found to be particularly problematic. For this reason, a vector for allelic replacement (pTEX5500ts) was constructed that includes (i) the pWV01-based gram-positive repAts replication region, which is known to confer a high degree of temperature intolerance, (ii) Escherichia coli oriR from pUC18, (iii) two extended multiple-cloning sites located upstream and downstream of one of the marker genes for efficient cloning of flanking regions for double-crossover mutagenesis, (iv) transcriptional terminator sites to terminate undesired readthrough, and (v) a synthetic extended promoter region containing the cat gene for allelic exchange and a high-level gentamicin resistance gene, aph(2′′)-Id, to distinguish double-crossover recombination, both of which are functional in gram-positive and gram-negative backgrounds. To demonstrate the functionality of this vector, the vector was used to construct an acm (encoding an adhesin to collagen from E. faecium) deletion mutant of a poorly transformable multidrug-resistant E. faecium endocarditis isolate...

Strains of Enterococcus faecium express a cell wall-anchored protein, Acm, which mediates adherence to collagen. Here, we (i) identify the minimal and high-affinity binding subsegments of Acm and (ii) show that anti-Acm immunoglobulin Gs (IgGs) purified against these subsegments reduced E. faecium TX2535 strain collagen adherence up to 73 and 50%, respectively, significantly more than the total IgGs against the full-length Acm A domain (28%) (P < 0.0001). Blocking Acm adherence with functional subsegment-specific antibodies raises the possibility of their use as therapeutic or prophylactic agents.

Enterococcus faecium is a multidrug-resistant opportunist causing difficult-to-treat nosocomial infections, including endocarditis, but there are no reports experimentally demonstrating E. faecium virulence determinants. Our previous studies showed that some clinical E. faecium isolates produce a cell wall-anchored collagen adhesin, Acm, and that an isogenic acm deletion mutant of the endocarditis-derived strain TX0082 lost collagen adherence. In this study, we show with a rat endocarditis model that TX0082 Δacm::cat is highly attenuated versus wild-type TX0082, both in established (72 h) vegetations (P < 0.0001) and for valve colonization 1 and 3 hours after infection (P ≤ 0.0002), making Acm the first factor shown to be important for E. faecium pathogenesis. In contrast, no mortality differences were observed in a mouse peritonitis model. While 5 of 17 endocarditis isolates were Acm nonproducers and failed to adhere to collagen in vitro, all had an intact, highly conserved acm locus. Highly reduced acm mRNA levels (≥50-fold reduction relative to an Acm producer) were found in three of these five nonadherent isolates, including the sequenced strain TX0016, by quantitative reverse transcription-PCR, indicating that acm transcription is downregulated in vitro in these isolates. However...

Enterococcus faecium recently evolved from a generally avirulent commensal into a multidrug-resistant health care-associated pathogen causing difficult-to-treat infections, but little is known about the factors responsible for this change. We previously showed that some E. faecium strains express a cell wall-anchored collagen adhesin, Acm. Here we analyzed 90 E. faecium isolates (99% acm+) and found that the Acm protein was detected predominantly in clinically derived isolates, while the acm gene was present as a transposon-interrupted pseudogene in 12 of 47 isolates of nonclinical origin. A highly significant association between clinical (versus fecal or food) origin and collagen adherence (P ≤ 0.0003) was also demonstrated, and levels of adherence were highly correlated (r = 0.879) with the amount of cell surface Acm detected by whole-cell enzyme-linked immunosorbent assay and flow cytometry. Thirty-seven of 41 sera from patients with E. faecium infections showed reactivity with recombinant Acm, while only 4 of 30 community and hospitalized patient control group sera reacted (P ≤ 0.0003); importantly, antibodies to Acm were present in all 14 E. faecium endocarditis patient sera. Although pulsed-field gel electrophoresis indicated that multiple strains expressed collagen adherence...

Mestrado em Engenharia Informática; Muitos dos trabalhos de classificação existentes na literatura, envolvem a atribuição a cada instância (exemplo) de uma única classe, de entre um conjunto pré-definido de classes normalmente pequeno e organizado de forma plana. Porém, existem problemas de classificação mais complexos, em que a cada instância é possível atribuir mais do que uma classe, podendo as classes, estar organizadas numa estrutura hierárquica. Para estes problemas, existe um conjunto de abordagens para lidar com o facto de uma instância poder pertencer a mais do que uma classe (classificação multi-etiqueta). Existem também abordagens para lidar com a organização hierárquica das classes (classificação hierárquica). Esta dissertação, apresenta um estudo das abordagens e conceitos de classificação multi-etiqueta e hierárquica, aplicados à classificação de documentos de texto. Trata-se, portanto, de um problema de classificação, em que as instâncias são documentos de texto, que podem pertencer a mais do que uma classe e estas encontram-se organizadas hierarquicamente. Nos problemas de classificação de texto, uma fase importante, é o pré-processamento dos documentos. Um processo transformativo...

Este trabalho tem como objetivo analisar a relação da marca Cemitério Ecumênico João XXIII com a marca de sua proprietária e administradora - ACM RS. Foi realizada uma revisão bibliográfica sobre o assunto estudado, além de duas etapas de pesquisa, uma qualitativa e outra quantitativa. Entre os principais resultados obtidos com as pesquisas estão: os entrevistados não relacionam as marcas ACM e João XXIII; a primeira é mais reconhecida em Porto Alegre segundo os respondentes. A ACM é mais associada com esporte/ academia e educação/ escola. O Cemitério Ecumênico João XXIII tem sua marca associada à religião/ igreja em primeiro lugar. A imagem da ACM é mais positiva que a imagem do João XXIII. Esses resultados fornecem subsídios para decisões gerenciais das marcas, bem como sugere possibilidades de estudos futuros.; This paper aims to examine the relationship between the Cemitério Ecumênico João XXIII brand and its owner and manager YMCA brand. It held a literature review on the subject studied, in addition to two stages of research, a qualitative and a quantitative. Among the main achievements of the searches are: the interviewees did not relate the YMCA brand and João XXIII brand and according to the respondents the YMCA is more recognized in Porto Alegre. The YMCA is also more associated with sports/ gym and education/ school. The Cemitério Ecumênico João XXIII has its brand first associated with religion/ church. The image of the YMCA is more positive than the image of João XXIII. These results provide subsidies for brand management and also suggests possibilities for future studies.

This is the author's version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in Proceedings of the 19th ACM international conference on Multimedia, http://dx.doi.org/10.1145/2072298.2072401; This short overview describes the contents of the tutorial Semantic computing in multimedia, which was offered to the participants of ACM Multimedia 2011. Given the impossibility of summarizing properly the contents of the tutorial in just two pages, the purpose of this overview is mainly to introduce the reader to the relevant bibliography.

The Third ACM Workshop on Geotagging and Its Applications in Multimedia(GeoMM'14), continues the workshops in 2012 and 2013, with the goal of building a forum for the presentation and synthesis of vision and insight from leading experts and practitioners

If X is a finite set of points in a multiprojective space P^n1 x ... x P^nr with r >= 2, then X may or may not be arithmetically Cohen-Macaulay (ACM). For sets of points in P^1 x P^1 there are several classifications of the ACM sets of points. In this paper we investigate the natural generalizations of these classifications to an arbitrary multiprojective space. We show that each classification for ACM points in P^1 x P^1 fails to extend to the general case. We also give some new necessary and sufficient conditions for a set of points to be ACM.; Comment: 21 pages; revised final version; minor corrections; to appear in Collectanea Mathematica

This is the final version published by ACM in Proceedings of the 13th international conference on Modularity (MODULARITY '14). ACM, New York, NY, USA, 37-48, available from the ACM Digital Library here: http://dl.acm.org/citation.cfm?doid=2577080.2577090.; This paper reports on our experience with providing Information Flow Control (IFC) as a library. Our aim was to support the use of an unmodified Platform as a Service (PaaS) cloud infrastructure by IFC-aware web applications. We discuss how Aspect Oriented Programming (AOP) overcomes the limitations of RubyTrack, our first approach. Although use of AOP has been mentioned as a possibility in past IFC literature we believe this paper to be the first illustration of how such an implementation can be attempted. We discuss how we built FlowR (Information Flow Control for Ruby), a library extending Ruby to provide IFC primitives using AOP via the Aquarium open source library. Previous attempts at providing IFC as a language extension required either modification of an interpreter or significant code rewriting. FlowR provides a strong separation between functional implementation and security constraints which supports easier development and maintenance; we illustrate with practical examples. In addition...

We investigate a heuristic application-level (overlay) multicast approach, which we call Topology Aware Grouping (TAG). TAG exploits underlying network topology data to construct multicast overlay networks. TAG uses information about overlap in routes to the sender among group members to set up the overlay network in a distributed low-overhead manner. The constructed tree has low relative delay penalty, and introduces a limited number of identical copies of a packet on the same link– assuming underlying routes are of good quality. We study the properties of TAG, and quantify its economies of scale factor, compared to unicast and IP multicast. We also compare TAG with End System Multicast (ESM) in a variety of simulation configurations, including both real Internet topologies and generated topologies. Our results indicate the effectiveness of our heuristic in reducing delays and duplicate packets, with reasonable time and space complexities. TAG can be combined with delay and bandwidth bounds to construct overlays that satisfy application requirements.; © ACM, 2009. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in the Proceedings of ACM NOSSDAV. http://doi.acm.org/10.1145/507670.507688 …………………………………………………………………………………………………………………………………………………………………………………… "Topology-Aware Overlay Networks for Group Communication...

This paper presents a new idea for lexical analysis: lolo (language-oriented lexer objects) is strictly based on the object orientation paradigm. We introduce the idea behind the system, describe the implementation, and compare it to the conventional approach using lex[1] or flex[2].lolo[3] extracts symbols from a sequence of input characters belonging to the ASCII or Unicode sets. lolo scanners can be extended without access to the source code: symbol recognizers can be derived by inheritance and an executing scanner can be reconfigured for different contexts. Recognizer actions are represented by objects which may be replaced at any time. Recognizers need not be based on finite state automata; therefore, lolo can recognize symbols that systems like lex cannot recognize directly.; Copyright ACM, 2002. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in ACM SIGPLAN Notices, Volume 37, Issue 2 (February 2002). http://doi.acm.org/10.1145/568600.568610

This paper describes oops, an object-oriented parser generator implemented in Java [1]. Oops takes a grammar written in EBNF, checks that it is indeed LL(1), i.e., suitable for recursive descent parsing, and produces a parser as a set of serialized objects. A scanner must be provided and classes satisfying certain interfaces can be implemented which the parser uses to build parse trees. The paper discusses the ideas behind oops — which are not specific to an implementation in Java — and shows the advantages of an object-oriented approach to grammar verification and parsing.; Copyright ACM, 2000. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in ACM SIGPLAN Notices, Volume 35, Issue 12 (December 2000). http://doi.acm.org/10.1145/369928.369941

Recently, both Miami University of Ohio and the Rochester Institute of Technology received NSF grants to develop undergraduate software engineering laboratories. While the general goals of the labs are similar, specific hardware and software selections were driven by differing curricular emphases and educational environments at the two institutions. This paper presents the distinctive characteristics of each school's program, discusses the influence of these features on the selection process, and describes our experiences to date with the resulting labs. The goal is to provide useful information and guidance to others considering such facilities.; © ACM, 1992. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in the Proceedings of the twenty-third SIGCSE technical symposium on Computer science education. http://doi.acm.org/10.1145/134510.134523 ........................"Undergraduate software engineering laboratories: a progress report from two universities," Proceedings of the twenty-third SIGCSE technical symposium on Computer science education. Held in Kansas City, Missouri, United States: 5-6 March 1992.; SIGCSE: ACM Special Interest Group on Computer Science Education

Our contention is that there now exists a considerable body of lab exercises that may be used in conjunction with introductory courses. There are fewer models available for instructors of more advanced programming courses, especially those courses which attempt to introduce students to current practices in software engineering. In this paper, we report on our experiences in building a second-year programming course that includes a significant lab and project component. These labs and projects are the vehicle we use to introduce students to the world of professional practice in software development.; © ACM, 1994. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in the Proceedings of the twenty-fifth SIGCSE symposium on Computer science education. http://doi.acm.org/10.1145/191029.191072 ................................. "Professional Literacy: Labs for Advanced Programming Courses" Proceedings of the twenty-fifth SIGCSE symposium on computer science education. Held in Phoenix, Arizona, United States: 10-12 March 1994.; SIGCSE: ACM Special Interest Group in Computer Science

Web image clustering has drawn significant attention in the research community recently. However, not much work has been done in using multi-modal information for clustering Web images. In this paper, we address the problem of Web image clustering by simultaneous integration of visual and textual features from a graph partitioning perspective. In particular, we modelled visual features, images, and words from the surrounding text of the images using a tripartite graph. This graph is actually considered as a fusion of two bipartite graphs that are partitioned simultaneously by the proposed Consistent Isoperimetric High-order Co-clustering (CIHC) framework. Although a similar approach has been adopted before, the main contribution of this work lies in the computational efficiency, quality in Web image clustering and scalability to large image repositories that CIHC is able to achieve. We demonstrate this through experimental results performed on real Web images.; © ACM, 2009. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in the Proceedings of ACM Multimedia 2007. http://doi.acm.org/10.1145/1291233.1291301 …………………………………………………………………………………………………………………………………………………............................................. "Clustering Web Images with Multi-modal Features...

Image clustering solely based on visual features without any knowledge or background information suffers from the problem of semantic gap. In this paper, we propose SS-NMF: a semi-supervised non-negative matrix factorization framework for image clustering. Accumulated relevance feedback in a CBIR system is treated as user provided supervision for guiding the image clustering. We consider the set of positive images in the feedback as constraints on the clustering specifying that the images “must” be clustered together. Similarly, negative images provide constraints specifying that they “cannot” be clustered along with the positive images. Through an iterative algorithm, we perform symmetric trifactorization of the image-image similarity matrix to infer the clustering. Theoretically, we prove the correctness of SS-NMF by showing that the algorithm is guaranteed to converge. Through experiments conducted on general purpose image datasets, we demonstrate the superior performance of SS-NMF for clustering images effectively.; © ACM, 2009. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in the Proceedings of ACM Multimedia 2007. http://doi.acm.org/10.1145/1291233.1291300 …………………………………………………………………………………………………………………………………………………............................................. "Deriving Semantics for Image Clustering from Accumulated User Feedbacks...

O desenvolvimento desta pesquisa discutiu o processo de intervenção e promoção do esporte e lazer na sociedade sorocabana, tendo como objeto de estudo a Associação Cristã de Moços – ACM e Faculdade de Educação Física de Sorocaba –FEFISO. Os objetivos do presente estudo foram o de identificar o papel e a posição da Associação Cristã de Moços na comunidade local e verificar a sua influência na disseminação da prática do esporte e lazer em Sorocaba, bem como sua contribuição para formulação de uma política pública no campo do lazer. A abordagem foi predominantemente qualitativa, de natureza exploratória, baseada, essencialmente, em pesquisas bibliográfica, documental e de campo. A pesquisa bibliográfica foi desenvolvida junto ao Sistema de Bibliotecas da Universidade Metodista de Piracicaba (Unimep), a partir das palavras-chave: ACM; Lazer; Esporte. Um amplo levantamento documental e de fatos foi realizado para posterior análise histórica, centrando a atenção na investigação da ACM e da Prefeitura Municipal de Sorocaba. A amostra foi estabelecida de forma não probabilística, por critérios de representatividade e acessibilidade. Na fase da pesquisa de campo, utilizamos a entrevista semi-estruturada...