We are currently living in the Internet of Things (IoT) era, which involves devices that are connected to Internet and are communicating with each other. Each year, the number of devices increases rapidly, which result in rapid growth of data that is generated. This large amount of data is sometimes titled as Big Data, which is generated from different sources, such as log data of user behavior. These log files can be collected and analyzed in different ways, such as creating product recommendations. Product recommendations have been around since the late 90s, when the amount of data collected were not at the same level as it is today. The aim of this thesis has been to investigating methods to process and create product recommendations to see how well they are adapted for Big Data. This has been accomplished by three theory studies on how to process user events, how to make the product recommendation algorithm called collaborative filtering scalable and finally how to convert implicit feedback to explicit feedback (ratings). This resulted in a recommendation engine consisting of Apache Spark as the data processing system, which had three functions: read multiple log files and concatenate log files for each month, parsing the log files of the user events to create explicit ratings from the transactions and create four types of recommendations. The NoSQL database MongoDB was chosen as the database to store the different types of product recommendations that was created. To be able to get the recommendations from the recommendation engine and the database, a REST API was implemented which can be used by any third-party. What can be concluded from the results of this thesis work is that the system that was implemented is partial scalable. This means that Apache Spark was scalable for both concatenating files, parse and create ratings and also create the recommendations using the ALS method. However, MongoDB was shown to be not scalable when managing more than 100 concurrent requests. Future work involves making the recommendation engine distributed in a multi-node cluster to utilize the parallelization of Apache Spark. Other recommendations include considering other NoSQL databases that might be more scalable than MongoDB.

[pt] O estudo teve por objetivo investigar o mecanismo de formação de trincas superficiais na direção longitudinal de laminação em barras do aço 1538 DH adotado na fabricação de componentes para a indústria automobilística. Tem-se conseguido alguns avanços no entendimento dos mecanismos de trincamento de produtos laminados, porém tais avanços não permitem, até o presente momento, a eliminação total do problema, o que vem causando o sucateamento de um expressivo percentual de produtos siderúrgicos. No escopo deste trabalho chegou-se a características microestruturais do material que sugerem as causas do trincamento durante o processo de laminação e, para tal, realizou-se o mapeamento das trincas, análises por microscopia ótica, classificação das inclusões, caracterizações por microscopia eletrônica de varredura e EDS, difração de raios-X, ensaios de tração, ensaios de dureza e microdureza, bem como simulação de ciclos térmicos. Os resultados destas análises indicaram que a nucleação e posterior propagação das trincas podem estar relacionadas à presença de precipitados de segunda fase em regiões interdendríticas, o que causaria a fragilização do contorno de grão durante laminação a quente. / [en] The purpose of this study was to investigate the cracking mechanism with regard to longitudinal surface cracks in rolled 1538 DH steel bars used for the automotive industry. Although some advances have been achieved concerning the understanding of the cracking mechanism, the problem is not yet totally eliminated and still causing the scraping of a significant percentage of steel products. In the course of this work it was possible to determine some microstructural characteristics of the material which may lead to cracking due to the rolling process. In this sense, it was necessary to carry out an experimental procedure that included crack mapping, optical microscopy, classification of the inclusions, scanning electron microscopy, EDS analysis, X- ray diffraction, tensile testing, hardness and microhardness evaluation as well as thermal cycle simulations. The results seem to suggest that the crack nucleation and crack propagation are related to the presence of interdendritic second phase particles which induce to grain boundary embrittlement during hot rolling.

Made available in DSpace on 2014-06-11T19:28:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-03-01Bitstream added on 2014-06-13T18:57:45Z : No. of bitstreams: 1 gimenes_r_me_jabo.pdf: 1889202 bytes, checksum: 70c17833465fd5274a27b26b4d8f268c (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / As praças são espaços públicos urbanos livres de edificações que tem a função de promover convivência sadia à população, oferecendo recreação e bem estar num ambiente agradável. Muitas praças foram implantadas há muitos anos; algumas passaram por reformas, no entanto, é importante que se faça uma análise periódica a fim de adequar às necessidades dos usuários. A Praça Sete de Setembro no município de Ribeirão Preto-SP, antes chamada por Aureliano de Gusmão, possui um diferencial das outras praças da cidade, proporciona usos diversos aos seus usuários. Com uma área de 16.619,41 m², com grande diversidade de espécies arbóreas, promove conforto térmico bastante agradável aos seus freqüentadores, além de melhorar a qualidade de vida para aqueles que a utilizam. Desta forma este trabalho teve por objetivo fazer um levantamento histórico-cultural e paisagístico, bem como, fazer uma análise qualiquantitativa dos elementos arquitetônicos e da arborização da Praça Sete de Setembro, uma das mais freqüentadas da região central do município de Ribeirão Preto, SP. Foi feita uma pesquisa de opinião, aplicada na praça em dias da semana e horários diferentes, por meio de 100 questionários com perguntas diretas aos entrevistados. Concluiu-se que a Praça Sete de Setembro é usada para reunir e promover lazer a diferentes grupos de pessoas, preferencialmente do sexo feminino, de 21 a 40 anos, para descanso e passeio com as crianças; oferece aos seus usuários elementos arquitetônicos adequados e em bom estado de conservação e apresenta grande diversidade de espécies arbóreas (86 espécies num total de 281) / The squares are urban public places without buildings that have the function to promote the population healthy living, offering recreation and wellness in a pleasant environment. Many squares have been implemented over many years ago, some have gone through renovations, however, it is important to make a periodic assessment in order to adapt them to the users’ needs. The Sete de Setembro Square from Ribeirão Preto city, which had been called by Aureliano de Gusmão Square, has the edge on the others that is an active social life, being a plenty attractions scenario. The place has an area of 16, 619.41 m², owns a great tree species diversity, promotes thermal comfort to its users, as well as their life quality. Thus the aim of this work was to do a historical, cultural and landscaping survey, and also make a qualitative and quantitative analysis of its architectural features and the arborization rate from Sete de Setembro Square which is one of the most visited squares in Ribeirão Preto’s downtown, SP. It was applied an opinion poll over different day times and different week days, through 100 questionaires, with direct questions. It was concluded that Sete de Setembro Square is visited by different people groups in order to have leisure, especially by women, people from 21 to 40 years old, to rest and let kids walk; offering to the visitors a suitable architectural features and well-conserved and a large diversity of tree species (87 species in a total of 281)

Submitted by Viviane Lima da Cunha (viviane@biblioteca.ufpb.br) on 2015-05-27T12:26:55Z No. of bitstreams: 1 arquivototal.pdf: 1504601 bytes, checksum: b422ab3ac2dcd0965d6026cde4cb4cac (MD5) / Approved for entry into archive by Leonardo Americo (leonardo@sti.ufpb.br) on 2015-05-27T12:38:38Z (GMT) No. of bitstreams: 1 arquivototal.pdf: 1504601 bytes, checksum: b422ab3ac2dcd0965d6026cde4cb4cac (MD5) / Made available in DSpace on 2015-05-27T12:38:38Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1504601 bytes, checksum: b422ab3ac2dcd0965d6026cde4cb4cac (MD5) Previous issue date: 2014-08-22 / We began this work with the presentation of proof of Euler to the problem of Basel then we present two other most current statements when problem Basel and finaly an approach to preliminary content for the understanding the demonstrations here cited. Studied and statements presented in this document were extracted from [11] and [10]. / Iniciamos este trabalho com a apresentação da Prova de Euler ao problema de Basileia em seguida apresentamos outra demonstração mais atual ao Problema de Basileia e por fim uma abordagem aos conteúdos preliminares para o entendimento das demonstrações aqui citadas. As demonstrações estudadas e apresentadas neste documento foram extraídas de [11] e [10].

Made available in DSpace on 2014-10-09T12:48:58Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:05:51Z (GMT). No. of bitstreams: 1 09624.pdf: 7500503 bytes, checksum: 0fbfc877328a1063a37709866b6cefdc (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

Made available in DSpace on 2014-12-17T14:19:49Z (GMT). No. of bitstreams: 1 AlzileneFS.pdf: 3190414 bytes, checksum: b958bf96fde2ea1d5d03c0aac9ae2f00 (MD5) Previous issue date: 2009-04-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / It s in the city spaces, molded from the uses and daily appropriations, that life is woven, as a product of the social relationships from the accumulation of history along with the present day fabric. Within this relationship, the old and the new are elements which make up this tapestry, as a result of the contribution of successive generations. The public square is seen as an example of this relationship, since it consists of a fertile space for opportunities of urban life coexistence. It is within the trace of these considerations that the present study emerges regarding the appropriation and sociability of the Tom? de Sousa Square, located in the city of Salvador, BA, having as its main focus the special relation between the cinema and the public square, as it relates to the space of the exhibition of cinematographic art. The showing of films in public squares makes possible a distinctive means of appropriation which has occurred ever since the beginning of the cinema. Today in Brazil, projects of this nature abound, which aim at presenting the seventh art to a great portion of the population which doesn t have access to conventional movie theater projection rooms. This particular Projeto Cinema na Pra?a Cinema in the Square Project carried out in Salvador, has become the empirical reference point for such work. This journey reveals the fascination that this great art has woven through time, attracting and charming multitudes. The cinema touches people in a special way, stirring up affectionate feelings, which are reflected in multiple social practices. Regarding this work, what stands out above all are the projections in the squares, initiatives which make it possible for the films to be watched collectively. What was taken into account in order to carry out this work were the reports of those who came regularly to watch the cinema in the Square sessions, those involved with the cinema projects team, and the film makers. To do the work, besides a bibliographical revision, observations were made of participants in the Tom? de Sousa Square, taken from semi-structured interviews with people involved with the film projection projects and those who came regularly to the cinema in the Square sessions. Also investigations were made in newspapers, printed magazines and the internet, from document and iconographic sources. The photographic documentation proved to be an important contribution to the field work. The research therefore develops from the understanding that the social practices are what make possible the uses of and the appropriation of the spaces. Within this perspective the public square emerges as a privileged locus where possibilities flourish for multiple manifestations that social practices can generate / S?o nos espa?os da cidade, moldados a partir dos usos e apropria??es cotidianos que a vida se efetiva, como produto das rela??es sociais, da acumula??o hist?rica e da tecedura realizada no presente. Nessa rela??o, o velho e o novo s?o elementos que constituem esse cen?rio, resultante das constru??es das sucessivas gera??es. A pra?a ? vista como exemplo dessa rela??o, pois consiste em um espa?o f?rtil de possibilidades de conviv?ncia urbana. No rastro dessas considera??es, surge o presente estudo sobre a apropria??o e sociabilidade na Pra?a Tom? de Sousa, localizada na cidade de Salvador-Ba, tendo como enfoque prec?puo a rela??o especial entre o cinema e a pra?a, no que diz respeito ao espa?o das pr?ticas de exibi??o da arte cinematogr?fica. As exibi??es de filmes em pra?as viabilizam um modo peculiar de apropria??o que ocorre desde os prim?rdios do cinema. Atualmente no Brasil pululam projetos dessa natureza, que visam a apresenta??o da s?tima arte ? grande parcela da popula??o que n?o tem acesso ?s salas convencionais de proje??o. Nesse particular o Projeto Cinema na Pra?a, realizado em Salvador, torna-se a refer?ncia emp?rica desse trabalho. Esse caminhar revela o fasc?nio que essa grande arte vem tecendo ao longo dos tempos, atraindo e encantando multid?es. O cinema toca de modo especial as pessoas, despertando afetos e isso se reverbera em m?ltiplas pr?ticas sociais. No tocante a esse trabalho, destaca-se mormente as proje??es em pra?as, iniciativas que tornam poss?veis assistir a filmes coletivamente. Para realiza??o do trabalho levou-se em considera??o os relatos dos freq?entadores das sess?es de cinema na Pra?a, das pessoas envolvidas da equipe dos projetos de cinema e cineastas. Para a feitura do trabalho, afora a revis?o bibliogr?fica, realizou-se observa??es participantes na Pra?a Tom? de Sousa, entrevistas semi-estruturadas com pessoas envolvidas com projetos de exibi??o e freq?entadores das sess?es de cinema na Pra?a. Tamb?m investiga??o em jornais e revistas impressos e na Internet, al?m de fontes documentais e iconogr?ficas. O registro fotogr?fico apresenta-se como importante contributo ao trabalho de campo. A pesquisa desenvolve-se, portanto, a partir da compreens?o de que s?o as pr?ticas sociais, que tornam poss?veis os usos e apropria??es dos espa?os. Nessa perspectiva a pra?a surge como um l?cus privilegiado onde afloram-se possibilidades de m?ltiplas manifesta??es que as pr?ticas sociais podem engendrar

The focus of the project is to validate the fluid model with different flooring materials and the measurements of an instrument to test flooring materials and its force attenuating capabilities using mathematical models to describe the signature and coefficients of the floor.As a part of improving the knowledge about the linear dynamics of vibrations involved during the sudden impact caused on hip bones of elderly people during fall. The project initiated in January 2017 and end date was set to May 2017.The main contribution of the present work focuses on the development of a mathematical fluid model for floors. The aim of the thesis was to analyze, compare different floor materials and to study the linear dynamics of falling impacts on floors. The impact of the hammer during a fall is captured by an accelerometer and response is collected using a picoscope. The collected data was analyzed using matlab least square method which is coded as per the fluid model.The finding from this thesis showed that the fluid model works with a more elastic model but it doesn't work for rigid materials like wood. The importance of parameters like velocity, mass, energy loss and other coefficients of a floor which influences the model during the impact of falling on floors were identified and a standardized testing method was set.

Orientador: Kathia Fernandes Lopes Pivetta / Banca: Regina Maria Monteiro de Castilho / Banca: Claúdia Fabrino Machado Mattiuz / Resumo: As praças são espaços públicos urbanos livres de edificações que tem a função de promover convivência sadia à população, oferecendo recreação e bem estar num ambiente agradável. Muitas praças foram implantadas há muitos anos; algumas passaram por reformas, no entanto, é importante que se faça uma análise periódica a fim de adequar às necessidades dos usuários. A Praça Sete de Setembro no município de Ribeirão Preto-SP, antes chamada por Aureliano de Gusmão, possui um diferencial das outras praças da cidade, proporciona usos diversos aos seus usuários. Com uma área de 16.619,41 m², com grande diversidade de espécies arbóreas, promove conforto térmico bastante agradável aos seus freqüentadores, além de melhorar a qualidade de vida para aqueles que a utilizam. Desta forma este trabalho teve por objetivo fazer um levantamento histórico-cultural e paisagístico, bem como, fazer uma análise qualiquantitativa dos elementos arquitetônicos e da arborização da Praça Sete de Setembro, uma das mais freqüentadas da região central do município de Ribeirão Preto, SP. Foi feita uma pesquisa de opinião, aplicada na praça em dias da semana e horários diferentes, por meio de 100 questionários com perguntas diretas aos entrevistados. Concluiu-se que a Praça Sete de Setembro é usada para reunir e promover lazer a diferentes grupos de pessoas, preferencialmente do sexo feminino, de 21 a 40 anos, para descanso e passeio com as crianças; oferece aos seus usuários elementos arquitetônicos adequados e em bom estado de conservação e apresenta grande diversidade de espécies arbóreas (86 espécies num total de 281) / Abstract: The squares are urban public places without buildings that have the function to promote the population healthy living, offering recreation and wellness in a pleasant environment. Many squares have been implemented over many years ago, some have gone through renovations, however, it is important to make a periodic assessment in order to adapt them to the users' needs. The Sete de Setembro Square from Ribeirão Preto city, which had been called by Aureliano de Gusmão Square, has the edge on the others that is an active social life, being a plenty attractions scenario. The place has an area of 16, 619.41 m², owns a great tree species diversity, promotes thermal comfort to its users, as well as their life quality. Thus the aim of this work was to do a historical, cultural and landscaping survey, and also make a qualitative and quantitative analysis of its architectural features and the arborization rate from Sete de Setembro Square which is one of the most visited squares in Ribeirão Preto's downtown, SP. It was applied an opinion poll over different day times and different week days, through 100 questionaires, with direct questions. It was concluded that Sete de Setembro Square is visited by different people groups in order to have leisure, especially by women, people from 21 to 40 years old, to rest and let kids walk; offering to the visitors a suitable architectural features and well-conserved and a large diversity of tree species (87 species in a total of 281) / Mestre

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Este texto é uma fabulação que cumpre papel de revelar um processo de trabalho em arte ao longo de dois anos. Trata-se de um percurso teórico-poético percorrido a partir da descoberta/invenção de um ateliê de criação em meio a minha residência. Um quadrado de 2x2 metros demarcado por sobreposição = fita amarela. Instaurado em divergentes contextos paisagísticos = casa, quarto de hotel, estúdio de dança, galeria de arte, palco, cidade. Trata de habitar os mesmos friccionando esfera de vivência pessoal e sítio específico de acontecimento. No texto, tem lugar reflexões pessoais a partir do trabalho, articulada a outros artistas (como Lygia Clark, Angel e Klauss Vianna, Antonin Artaud, Yves Klein, Min Tanaka, Tadashi Endo) e teóricos (dentre eles Hannah Arendt e Michel Foucault), compondo diferentes tons de fala produzidos ao longo desse período de trabalho / This essay is a fabulation that presents an art work over two years. It is a theoretical-poetic way, coursed from the discovery/invention of a creation studio inside my residence. A square of 2x2m made by superposition = yellow tape, done in different landscape contexts = house, hotel room, dance studio, art gallery, theater stage, city. The intention is to inhabit it rubbing a sphere of personal experiences and a specific site of happening. In the text, personal reflections take place from the art work, articulated with other artists (as Lygia Clark, Angel e Klauss Vianna, Antonin Artaud, Yves Klein, Min Tanaka, Tadashi Endo) and theorists (Hannah Arendt e Michael Foucault), composing different kinds of speech produced along this work period

O fator de Dancoff, em sua formulação clássica, corrige a corrente de nêutrons incidente na superfície de uma vareta combustível devido à presença das demais varetas da célula. Alternativamente, esse fator pode ser interpretado como a probabilidade de um nêutron oriundo de uma vareta de combustível entrar em outra vareta sem colidir no moderador ou no revestimento. Para combustíveis perfeitamente absorvedores essas definições são equivalentes. Entretanto, quando se assume a hipótese de absorção parcial no combustível, essa equivalência não se verifica. Então, os fatores de Dancoff devem ser determinados em termos de probabilidades de colisão. Ao longo dos últimos anos, vários trabalhos, usando ambas as definições, vêm relatando melhorias no cálculo dos fatores Dancoff. Neste trabalho, esses fatores são determinados através do método de probabilidades de colisão para células em geometria cluster com contorno externo quadrado, assumindo-se absorção total (Black Dancoff Factors) e parcial (Grey Dancoff Factors) no combustível. A validação dos resultados é feita através de comparações com a célula cilíndrica equivalente. O cálculo é realizado considerando-se reflexão especular, para a célula quadrada, e condição de contorno difusa (white) para a célula cilíndrica equivalente. Os resultados obtidos, com o aumento do tamanho das células, evidenciam o comportamento assintótico da solução. Além disso, são computados fatores de Dancoff para as células canadenses CANDU-37 e CANFLEX por ambas as metodologias de cálculo, direta e probabilística. Finalmente, os fatores de multiplicação efetivo, keff, para as células com contorno externo quadrado e a cilíndrica equivalente, são determinados e as diferenças registradas para os casos onde se assumem as hipóteses de absorção total e parcial. / In its classical formulation, the Dancoff factor for a perfectly absorbing fuel rod is defined as the relative reduction in the incurrent of resonance neutrons into the rod in the presence of neighboring rods, as compared to the incurrent into a single fuel rod immersed in an infinite moderator. Alternatively, this factor can be viewed as the probability that a neutron emerging from the surface of a fuel rod will enter another fuel rod without any collision in the moderator or cladding. For perfectly absorbing fuel these definitions are equivalent. In the last years, several works appeared in literature reporting improvements in the calculation of Dancoff factors, using both the classical and the collision probability definitions. In this work, we step further reporting Dancoff factors for perfectly absorbing (Black) and partially absorbing (Grey) fuel rods calculated by the collision probability method, in cluster cells with square outer boundaries. In order to validate the results, comparisons are made with the equivalent cylindricalized cell in hypothetical test cases. The calculation is performed considering specularly reflecting boundary conditions, for the square lattice, and diffusive reflecting boundary conditions, for the cylindrical geometry. The results show the expected asymptotic behavior of the solution with increasing cell sizes. In addition, Dancoff factors are computed for the Canadian cells CANDU-37 and CANFLEX by the Monte Carlo and Direct methods. Finally, the effective multiplication factors, keff, for these cells (cluster cell with square outer boundaries and the equivalent cylindricalized cell) are also computed, and the differences reported for the cases using the perfect and partial absorption assumptions.