986 resultados para Software radio base stations


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O crescimento experimentado pela indústria do software nas últimas décadas, trouxe consigo o aumento das exigências do mercado. É exigido das organizações de software, que os sistemas sejam construídos de acordo com prazo e custos determinados, obedecendo-se certos padrões de qualidade. Para atender tais exigências e assim obter o diferencial competitivo, tornou-se necessário investir no processo de desenvolvimento de software, dada a relação cada vez mais evidente entre a qualidade do produto de software e a eficiência e eficácia do processo de desenvolvimento adotado. Uma estratégia na busca pela maturidade em termos de processos é a definição e adoção de um processo único a ser seguido em todos os projetos de uma organização, denominado processo padrão. Levando-se em consideração a singularidade de cada novo projeto de software, é natural presumir que o processo padrão tenha de ser adaptado para as necessidades específicas de cada situação, de forma a ser aceito, ter seu uso maximizado e garantir a qualidade do software a ser produzido. Este trabalho apresenta, assim, o APSEE-Tail, um modelo para apoiar o engenheiro de processos na tarefa de adaptar o processo padrão de uma organização de software para as particularidades de cada um de seus projetos, possibilitando maior efetividade e eficiência no uso do mesmo. Sua abordagem de adaptação é livre, orientada à atividades e baseada no raciocínio, através da combinação das técnicas de interpretação de regras e CBR (Case Based Reasoning), sobre o conhecimento necessário. Tal conhecimento, neste trabalho, é agrupado em três categorias: diretrizes de adaptação do processo padrão, tipos de característica usados para definir os projetos de software e informações sobre adaptações realizadas anteriormente. Os diferentes componentes envolvidos na definição do APSEE-Tail foram especificados algebricamente, o que constituiu uma base semântica de alto nível de abstração e possibilitou a construção de um protótipo, implementado no ADS (Ambiente de Desenvolvimento de Software) Prosoft-Java e fracamente acoplado ao APSEE, um ambiente de engenharia de software centrado no processo também prototipado no Prosoft-Java, tornando-se assim parte do meta-processo adotado pelo mesmo. O texto apresenta ainda alguma fundamentação teórica sobre a área de Adaptação de Processos de Software, considerações sobre as abordagens pesquisadas, enfatizando as que mais influenciaram o APSEE-Tail, e um exemplo de aplicação do protótipo construído. Por fim, são apresentadas as contribuições e limitações da proposta, na visão do autor, bem como os trabalhos futuros vislumbrados.

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Verifica-se, portanto, que seus valores atendem interesses individuais antes de interesses coletivos. Ficou evidenciado pelo cálculo do INIP que estas empresas possuem um escore médio de intensidade, visto que grande parte da amostra tem baixos escores nos indicadores relativos à inovação. Foi possível verificar que nem todos os indicadores usualmente utilizados na medição da inovação tiveram expressividade para esta amostra, sendo que número de produtos novos, demandas atendidas, percentual de vendas advindas de novos produtos e percentual de redução de custos advinda de novos produtos foram os indicadores importantes para formação do INIP. Os valores motivacionais são preditores de comportamentos dos empreendedores. Com isto em mente, estudou-se a relação existente entre vários conjuntos de valores que Schwartz denominou de “tipo motivacional” e o índice de inovatividade do produto, entendendo-se que a partir daí se poderia entender o comportamento inovador neste ramo dinâmico e competitivo de base tecnológica que se configura o setor de software. Assim sendo, procurou-se investigar em que medida os valores de empreendedores estão relacionados com a inovatividade de produto, calculado pelo INIP (índice de inovatividade de produto) em empresas desenvolvedoras de software do Rio Grande do Sul. Para tanto, foi realizado um estudo tipo survey em uma amostra não probabilística de 112 empresas do setor. Na análise estatística dos dados foram usadas técnicas de: correlação, análise fatorial, análise de regressão e análise de clusters. Os dados analisados demonstram que o INIP está relacionado ao tipo motivacional de valores denominado realização. Esta associação já havia sido discutida no campo do empreendedorismo.

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o trabalho analisa a indústria nacional de software, em especial, o software para exportação e as fábricas de software, focalizando as estratégias e os desafios do empresariado nacional da Tecnologia da Informação e Comunicação que atua neste segmento. Tendo por base considerações sobre o taylorismo, o fordismo, a flexibilidade do trabalho, a legislação trabalhista vigente, a competitividade do mercado de software, a maturidade nos processos de gestão e a responsabilidade social das empresas, colocou-se em perspectiva os principais fatores que podem influenciar o sucesso ou o fracasso das empresas nacionais de Tecnologia da Informação e Comunicação que investem no segmento de fábrica de software;

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A central question in political economy is how to incentivize elected socials to allocate resources to those that need them the most. Research has shown that, while electoral incentives lead central governments to transfer fewer funds to non-aligned constituencies, media presence is instrumental in promoting a better allocation of resources. This study evaluates how these two phenomena interact by analyzing the role of media in compensating political biases. In particular, we analyze how media presence, connectivity and ownership affect the distribution of federal drought relief transfers to Brazilian municipalities. We find that municipalities that are not aligned with the federal government have a lower probability of receiving funds conditional on experiencing low precipitation. However, we show that the presence of radio stations compensates for this bias. This effect is driven by municipalities that have radio stations connected to a regional network rather than by the presence of local radio stations. In addition, the effect of network-connected radio stations increases with their network coverage. These findings suggests that the connection of a radio station to a network is important because it increases the salience of disasters, making it harder for the federal government to ignore non-allies. We show that our findings are not explained by the ownership and manipulation of media by politicians.

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O fenômeno "Born global" refere-se a empresas que consideram o mercado global como seu contexto natural e que iniciam seu processo de internacionalização muito cedo após sua criação. As teorias tradicionais como o modelo de Uppsala não conseguem explicar este processo. Portanto, outras teorias têm surgido, como a perspectiva de redes. Existem alguns estudos relacionados a esta área, principalmente realizados em países desenvolvidos com pequenos mercados e economias abertas. No entanto, poucos estudos têm sido feitos em economias em desenvolvimento. Além disso, o número de pesquisas quanto à escolha do modo de entrada e seleção de mercados das empresas “born global” é bastante limitado. Consequentemente, este estudo pretende descrever os principais fatores que influenciam a escolha do modo de entrada e seleção de mercados das empresas, de economias em desenvolvimento, nascidas globais. O foco da pesquisa é a indústria de software e um estudo de casos múltiplo foi realizado com três empresas no Equador. A metodologia incluiu entrevistas com fundadores, bem como a coleta de dados secundários. Com base na evidência empírica, verificou-se que os principais fatores que influenciam a escolha do modo de entrada são as restrições financeiras, as receitas esperadas, a velocidade de internacionalização, mercados nicho e a experiência empresarial anterior dos fundadores. Por outro lado, a seleção de mercado é influenciada por semelhanças de língua e cultura, mercados nicho e relações em rede.

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Uma linha de produtos de software (LPS), é um conjunto de produtos que partilham funcionalidades comuns, desenvolvidos de forma sistemática a partir de um conjunto de elementos de software base da LPS. As abordagens de desenvolvimento baseado em LPS revolucionaram a forma como as organizações realizam a engenharia de software. A obtenção de economias de escala, na concepção e distribuição de novos produtos, pela reutilização dos elementos de software base da LPS e instanciação dos variantes respectivos, é um dos principais benefícios na adopção desta abordagem. Numa LPS, a arquitectura de software de referência vai para além da dicotomia desenho/ codificação da arquitectura de software tradicional. A sua documentação, inclui a representação da arquitectura de software da LPS e respectivos pontos de variabilidade, bem como a descrição do processo para instanciação dos produtos. Numa pequena e média empresa (PME), os recursos humanos, técnicos e financeiros são escassos. A viabilidade da implementação de uma LPS adequa-se num contexto de redução de custos operacionais e eficiência do processo de produção dos produtos de software. O objectivo deste trabalho é o desenvolvimento e aplicação de uma metodologia para a gestão e implementação de uma LPS, adequada à realidade de uma PME. As principais contribuições do trabalho incluem: a) uma metodologia para a implementação e gestão de uma LPS adequada a uma PME, que prevê a definição da arquitectura de software da LPS com base num conjunto de produtos já existentes, b) a representação da arquitectura de software de uma LPS, suportado por modelos UML, estendidos através de um perfil UML, baseado em 3+1 perspectivas: dos requisitos, da implementação e dos componentes de execução, sendo que a vista (+1)ou “vista produtos” é uma instanciação das restantes três vistas no contexto particular da LPS ou de um produto, num determinado momento no tempo. A metodologia proposta foi aplicada à solução ARQUO™, uma solução real e em produção em diversas organizações.

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Some authors have shown the need of understanding the technological structuring process in contemporary firms. From this perspective, the software industry is a very important element because it provides products and services directly to many organizations from many fields. In this case, the Brazilian software industry has some peculiarities that distinguish it from other industries located in developed countries, which makes its understanding even more relevant. There is evidence that local firms take different strategies and structural configurations to enter into a market naturally dominated by large multinational firms. Therefore, this study aims to understand not only the structural configurations assumed by domestic firms but also the dynamic and the process that lead to these different configurations. To do so, this PhD dissertation investigates the institutional environment, its entities and the isomorphic movements, by employing an exploratory, descriptive and explanatory multiple cases study. Eight software development companies from the Recife's information technology Cluster were visited. Also, a form was applied and an interview with one of the main firm s professional was conducted. Although the study is predominantly qualitative, part of the data was analyzed through charts and graphs, providing a companies and environment overview that was very useful to analysis done through the interviews interpretation. As a result, it was realized that companies are structured around hybrids business models from two ideal types of software development companies, which are: software factory and technology-based company. Regarding the development process, it was found that there is a balanced distribution between the traditional and agile development paradigm. Among the traditional methodologies, the Rational Unified Process (RUP) is predominant. The Scrum is the most used methodology among the organizations based on the Agile Manifesto's principles. Regarding the structuring process, each institutional entity acts in such way that generates different isomorphic pressure. Emphasis was given to entities such as customers, research agencies, clusters, market-leading businesses, public universities, incubators, software industry organizations, technology vendors, development tool suppliers and manager s school and background because they relate themselves in a close way with the software firms. About this relationship, a dual and bilateral influence was found. Finally, the structuring level of the organizational field has been also identified as low, which gives a chance to organizational actors of acting independently

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Among the potentially polluting economic activities that compromise the quality of groundwater are the gas stations. The city of Natal has about 120 gas stations, of which only has an environmental license for operation. Discontinuities in the offices were notified by the Public Ministry of Rio Grande do Norte to carry out the environmental adaptations, among which is the investigation of environmental liabilities. The preliminary and confirmatory stages of this investigation consisted in the evaluation of soil gas surveys with two confirmatory chemical analysis of BTEX, PAH and TPH. To get a good evaluation and interpretation of results obtained in the field, it became necessary three-dimensional representation of them. We used a CAD software to graph the equipment installed in a retail service station fuel in Natal, as well as the plumes of contamination by volatile organic compounds. The tool was concluded that contamination is not located in the current system of underground storage of fuel development, but reflects the historical past in which tanks were removed not tight gasoline and diesel

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The general objective of this thesis has been seasonal monitoring (quarterly time scale) of coastal and estuarine areas of a section of the Northern Coast of Rio Grande do Norte, Brazil, environmentally sensitive and with intense sediment erosion in the oil activities to underpin the implementation of projects for containment of erosion and mitigate the impacts of coastal dynamics. In order to achieve the general objective, the work was done systematically in three stages which consisted the specific objectives. The first stage was the implementation of geodetic reference infrastructure for carrying out the geodetic survey of the study area. This process included the implementation of RGLS (Northern Coast of the RN GPS Network), consisting of stations with geodetic coordinates and orthometric heights of precision; positioning of Benchmarks and evaluation of the gravimetric geoid available, for use in GPS altimetry of precision; and development of software for GPS altimetry of precision. The second stage was the development and improvement of methodologies for collection, processing, representation, integration and analysis of CoastLine (CL) and Digital Elevation Models (DEM) obtained by geodetic positioning techniques. As part of this stage have been made since, the choice of equipment and positioning methods to be used, depending on the required precision and structure implanted, and the definition of the LC indicator and of the geodesic references best suited, to coastal monitoring of precision. The third step was the seasonal geodesic monitoring of the study area. It was defined the execution times of the geodetic surveys by analyzing the pattern of sediment dynamics of the study area; the performing of surveys in order to calculate and locate areas and volumes of erosion and accretion (sandy and volumetric sedimentary balance) occurred on CL and on the beaches and islands surfaces throughout the year, and study of correlations between the measured variations (in area and volume) between each survey and the action of the coastal dynamic agents. The results allowed an integrated study of spatial and temporal interrelationships of the causes and consequences of intensive coastal processes operating in the area, especially to the measurement of variability of erosion, transport, balance and supply sedimentary over the annual cycle of construction and destruction of beaches. In the analysis of the results, it was possible to identify the causes and consequences of severe coastal erosion occurred on beaches exposed, to analyze the recovery of beaches and the accretion occurring in tidal inlets and estuaries. From the optics of seasonal variations in the CL, human interventions to erosion contention have been proposed with the aim of restoring the previous situation of the beaches in the process of erosion.

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Activities that have fuel subterranean storage system are considered potentially polluting fuels by CONAMA Resolution 273, due to the possibility of leak, outpouring and overflow of fuel into the ground. Being even more worrying when contaminate groundwater for public supply, as the case of Natal City. For this reason, the Public Ministry/RN, in partnership with UFRN, developed the project environmental suitability of Gas stations in Natal, of which 36% showed evidence of contamination. This paper describes the four stages of the management of contaminated areas: preliminary assessment of environmental liabilities, detailed confirmatory investigation of the contamination, risk analysis to human health (RBCA), as well as the remediation plan of degraded areas. Therefore it is presented a case study. For the area investigated has been proposed a mathematical method to estimate the volume of LNAPL by a free CAD software (ScketchUp) and compare it with the partition method for grid area. Were also performed 3D graphics designs of feathers contamination. Research results showed that passive benzene contamination in groundwater was 2791.77 μg/L, when the maximum allowed by CONAMA Resolution 420 is 5 μg/L which is the potability standards. The individual and cumulative risks were calculated from 4.4 x10-3, both above the limits of 1.0 x10-5 or by RBCA 1.0 x10-6 by the Public Ministry/RN. Corrective action points that remediation of dissolved phase benzene is expected to reach a concentration of 25 μg/L, based on carcinogenic risk for ingestion of groundwater by residents residential, diverging legislation. According to the proposed model, the volume of LNAPL using the ScketchUp was 17.59 m3, while by the grid partitioning method was 14.02 m3. Because of the low recovery, the expected removal of LNAPL is 11 years, if the multiphase extraction system installed in the enterprise is not optimized

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The exponential growth in the applications of radio frequency (RF) is accompanied by great challenges as more efficient use of spectrum as in the design of new architectures for multi-standard receivers or software defined radio (SDR) . The key challenge in designing architecture of the software defined radio is the implementation of a wide-band receiver, reconfigurable, low cost, low power consumption, higher level of integration and flexibility. As a new solution of SDR design, a direct demodulator architecture, based on fiveport technology, or multi-port demodulator, has been proposed. However, the use of the five-port as a direct-conversion receiver requires an I/Q calibration (or regeneration) procedure in order to generate the in-phase (I) and quadrature (Q) components of the transmitted baseband signal. In this work, we propose to evaluate the performance of a blind calibration technique without additional knowledge about training or pilot sequences of the transmitted signal based on independent component analysis for the regeneration of I/Q five-port downconversion, by exploiting the information on the statistical properties of the three output signals

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

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We propose in this work a software architecture for robotic boats intended to act in diverse aquatic environments, fully autonomously, performing telemetry to a base station and getting this mission to be accomplished. This proposal aims to apply within the project N-Boat Lab NatalNet DCA, which aims to empower a sailboat navigating autonomously. The constituent components of this architecture are the memory modules, strategy, communication, sensing, actuation, energy, security and surveillance, making these systems the boat and base station. To validate the simulator was developed in C language and implemented using the graphics API OpenGL resources, whose main results were obtained in the implementation of memory, performance and strategy modules, more specifically data sharing, control of sails and rudder and planning short routes based on an algorithm for navigation, respectively. The experimental results, shown in this study indicate the feasibility of the actual use of the software architecture developed and their application in the area of autonomous mobile robotics

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The present study aims to analyze the potentialities and limitations of GeoGebra software on what concerns trigonometry s teaching and learning processes. Taking the present resources of public school from the state of Rio Grande do Norte, the research intends to answer the following question: Could we use the current conditions of public school and the Geogebra software to optimize the trigonometry s learning and teaching processes situation? . To make it a possible to answer the question above, a module of investigative activities was created and applied. The methodological intervention was made among second year High School students from a public school in Natal, RN. The theoretical reference of Mathematics Didactics was taken was a base, adopting the conceptions of Borba and Penteado (2001), Valente (1999) and Zulatto (2002, 2007) about the use of Information Technology (IT) on Mathematics classrooms. In order to create the investigative activities helped us to understand how the students make their constructions and their visual perception through the process of dragging images on the computer screen. Furthermore, the activities done with the GeoGebra software s resources facilitate the resolution of trigonometry situations

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)