Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-01-09T11:20:29Z No. of bitstreams: 1 sidilucioribeirosenra.pdf: 1593806 bytes, checksum: a139d5dc6a8f640d9c0239f03f79dd5a (MD5) / Approved for entry into archive by Diamantino Mayra (mayra.diamantino@ufjf.edu.br) on 2017-01-31T11:23:43Z (GMT) No. of bitstreams: 1 sidilucioribeirosenra.pdf: 1593806 bytes, checksum: a139d5dc6a8f640d9c0239f03f79dd5a (MD5) / Made available in DSpace on 2017-01-31T11:23:43Z (GMT). No. of bitstreams: 1 sidilucioribeirosenra.pdf: 1593806 bytes, checksum: a139d5dc6a8f640d9c0239f03f79dd5a (MD5) Previous issue date: 2016-02-29 / A presente dissertação, desenvolvida no Programa de Pós-Graduação Profissional em Gestão e Avaliação da Educação Pública PPGP/CAEd/UFJF, analisou o fluxo de abandono dos estudantes dos anos finais do ensino fundamental nas turmas do Projeto de Educação em Tempo Integral (PROETI), na circunscrição da Superintendência Regional de Ensino de Leopoldina (SRE- Leopoldina), em Minas Gerais, a partir da investigação em duas escolas desta SRE. O objetivo deste trabalho foi investigar os fatores que têm contribuído para a permanência ou abandono dos estudantes nessas turmas. Acredita-se que, esta investigação poderá contribuir para o alcance da meta definida no Plano Estadual de Educação em atingir 80% dos alunos do ensino fundamental, matriculados em tempo integral, bem como proporcionar o acesso e permanência neste projeto que visa à formação cidadã e à melhoria dos resultados educacionais. Para a realização deste trabalho, foi utilizada a metodologia de estudo de caso, a análise documental, a pesquisa bibliográfica, a aplicação de questionários como procedimento de coleta de dados respondidos por analistas educacionais da SRE- Leopoldina, pelas diretoras, especialistas em educação e pelos professores das escolas A e B. Foram realizadas entrevistas com roteiros semiestruturados aos estudantes matriculados no projeto em 2015, nas turmas das respectivas escolas. A base teórica é composta por Cavaliere (2007), Maurício (2009), Moll (2012), entre outros. A pesquisa realizada demonstrou que não há um único fator que contribuiu e, acredita-se, continua contribuindo para o abandono dos estudantes, mas sim uma combinação de fatores tais como falhas na implementação do projeto pela Secretaria de Estado de Educação de Minas Gerais e SRE-Leopoldina, ausência de um monitoramento adequado, capacitação insuficiente para os professores e priorização pela SEE-MG do Programa de Intervenção Pedagógica (PIP). Assim sendo, visando aprimorar e aperfeiçoar esta importante política pública, é apresentado um Plano de Ação Educacional (PAE) com sugestões à SEE-MG, à SRE-Leopoldina e às Escolas pesquisadas, com diversas ações e organizado através de três títulos: capacitação, monitoramento e avaliação. / This thesis developed in the Postgraduate Studies Program in Professional Management and Evaluation of Public Education PPGP/CAED/UFJF, examined the abandonment flow of students from the final years of elementary school in Education Project classes in Full Time (PROETI), within the jurisdiction of the Regional Leopoldina Education (SRE Leopoldina) Minas Gerais, from research in two schools this SRE. Their goal was to investigate the factors that have contributed to the permanence or abandonment of the students in these classes. It is believed that this research could contribute to the achievement of the target set at the State Education Plan to achieve 80% of elementary school students enrolled in full-time and provide the access and permanence in this important project aimed at civic education and improving educational outcomes. To carry out this work we used the case study methodology, document analysis, bibliographic research, questionnaires and data collection procedure answered by educational analysts SRE Leopoldina, the directors, education specialists and teachers of Schools A and B semi-structured interviews were conducted with students enrolled in the project in 2015, in the classes of their schools. The theoretical basis consists of the authors Cavaliere (2007), Mauricio (2009), Moll (2012) among others. The survey showed that there is no single factor that has contributed and is believed to continue contributing to the abandonment of the students, but rather a combination of factors such as shortcomings in the implementation of the project by the Ministry of Education of Minas Gerais and SRE Leopoldina, the absence of an adequate monitoring, insufficient training for teachers and prioritization by ESS MG of Educational Intervention Program (PIP). Therefore, aiming to improve and enhance this important public policy presents an Educational Action Plan (PAE) with suggestions to SEE MG, the SRE Leopoldina and surveyed schools, with various actions and organized through three headings: training, monitoring and evaluation.

This paper empirically investigates the propagation of business sentiment within the European Union (EU) and adds to the literature on shock absorption via a common market's real economy. To this end, we combine EU-wide official business sentiment indicators with world input-output (IO) data and information on indirect wage costs. Econometrically, we model interdependencies in economic activities via IO-linkages and apply space-time models. The resulting evidence provides indication for the existence of substantial spillovers in business sentiment formation. Accordingly, and highlighted by the estimated impacts of changes in indirect labor costs, policy reforms aiming at increasing the resilience of the European single market need to take these spillovers into account in order to increase its effectiveness. / Series: Department of Economics Working Paper Series

To this day, terrorism perpetrated by non-state actors persists as a worldwide threat, as exemplified by the recent lethal attacks in Paris, London, Brussels, and the ongoing massacres perpetrated by the Islamic State in Iraq, Syria and neighbouring countries. In response, states deploy various counterterrorism policies, the costs of which could be reduced through more efficient preventive measures. The literature has not applied statistical models able to account for complex spatio-temporal dependencies, despite their potential for explaining and preventing non-state terrorism at the sub-national level. In an effort to address this shortcoming, this thesis employs Bayesian hierarchical models, where the spatial random field is represented by a stochastic partial differential equation. The results show that lethal terrorist attacks perpetrated by non-state actors tend to be concentrated in areas located within failed states from which they may diffuse locally, towards neighbouring areas. At the sub-national level, the propensity of attacks to be lethal and the frequency of lethal attacks appear to be driven by antagonistic mechanisms. Attacks are more likely to be lethal far away from large cities, at higher altitudes, in less economically developed areas, and in locations with higher ethnic diversity. In contrast, the frequency of lethal attacks tends to be higher in more economically developed areas, close to large cities, and within democratic countries.

We study the dynamics of time-like geodesics in the field of black holes perturbed by a circular ring or disc, restricting to static and axisymmetric class of space-times. Two analytical methods are tested which do not require solving the equations of motion: (i) the so-called geometric criterion of chaos based on eigenvalues of the Riemann tensor, and (ii) the method of Melnikov which detects the chaotic layer arising by break-up of a homoclinic orbit. Predictions of both methods are compared with numerical results in order to learn how accurate and reliable they are.

Multiple antenna techniques are used to increase the robustness and performance of wireless networks. Multiple antenna techniques can achieve diversity and increase bandwidth efficiency when specially designed channel codes are used at the scheme’s transmitter. These channel codes can be designed in the space, time and frequency domain. These specially designed channel codes in the space and time domain are actually designed for flat fading channels and in frequency selective fading channel, their performance may be degraded. To counteract this possible performance degradation in frequency selective fading channel, two main approaches can be applied to mitigate the effect of the symbol interference due to the frequency selective fading channel. These approaches are multichannel equalisation and orthogonal frequency division multiplexing (OFDM). In this thesis, a multichannel equalisation technique and OFDM were applied to channel codes specially designed for multiple antenna systems. An optimum receiver was proposed for super-orthogonal space-time trellis codes in a multichannel equalised frequency selective environment. Although the proposed receiver had increased complexity, the diversity order is still the same as compared to the code in a flat fading channel. To take advantage of the multipath diversity possible in a frequency selective fading channel, super-orthogonal block codes were employed in an OFDM environment. A new kind of super-orthogonal block code was proposed in this thesis. Super-orthogonal space-frequency trellis-coded OFDM was proposed to take advantage of not only the possible multipath diversity but also the spatial diversity for coded OFDM schemes. Based on simulation results in this thesis, the proposed coded OFDM scheme performs better than all other coded OFDM schemes (i.e. space time trellis-coded OFDM, space-time block coded OFDM, space-frequency block coded OFDM and super-orthogonal space-time trellis-coded OFDM). A simplified channel estimation algorithm was proposed for two of the coded OFDM schemes, which form a broad-based classification of coded OFDM schemes, i.e. trelliscoded schemes and block-coded schemes. Finally in this thesis performance analysis using the Gauss Chebychev quadrature technique as a way of validating simulation results was done for super-orthogonal block coded OFDM schemes when channel state information is known and when it is estimated. The results obtained show that results obtained via simulation and analysis are asymptotic and therefore the proposed analysis technique can be use to obtain error rate values for different SNR region instead of time consuming simulation. / Thesis (PhD)--University of Pretoria, 2012. / Electrical, Electronic and Computer Engineering / unrestricted

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In this dissertation it is shown that the telemetry versions of Feher-patented QPSK (FQPSK-JR) and shaped offset QPSK (SOQPSK-TG) can be interpreted as both cross-correlated, trellis-coded quadrature modulation (XTCQM) and continuous phase modulation (CPM). Based on these representations, both modulations can be detected with near optimal bit error rate performance using a common detector that is formulated as either an XTCQM detector, a traditional CPM detector, or a pulse amplitude modulation (PAM) detector (due to the PAM decomposition of the CPM representations of these modulations). In addition it is shown that the complexity of the XTCQM detector for SOQPSK-TG can be reduced by a factor of 128 with only a 0.2 dB loss in detection efficiency relative to the optimum detector. Three decoders for STC encoded OQPSK are presented. One decoder has a bit error rate performance that matches the SISO case but with much higher complexity than that of the QPSK decoder. A second decoder matches the simplicity of the decoder for STC encoded non-offset QPSK but with a loss of 3 dB relative to the single-input, single-output (SISO) case. A third decoder matches SISO performance with lower complexity than the first one. These results for STC encoded OQPSK are extended to STC SOQPSK. It is shown that the maximum likelihood decoder is not computationally feasible. Two suboptimal decoders based on the STC OQPSK decoders are presented. These decoders have much higher complexity than their OQPSK counterparts, and they provide inferior bit error rate performance. In addition, a least squares decoder for STC encoded SOQPSK is presented which is less complex and has better performance (within 1 dB of the SISO bound) than the previous two decoders. This decoder also handles the differential delays that can occur on aeronautical telemetry channels.

Space-time Adaptive Processing (STAP) is a two-dimensional filtering technique for antenna array with multiple spatial channels. The name "space-time" describes the coupling of these spatial channels with pulse-Doppler waveforms. Applications for STAP includes ground moving target indicator (GMTI) for airborne radar systems. Today, there are strong interests to develop STAP algorithms for operations in “sample starved” environments, where intense environmental interference can reduce STAP capacity to detect and track ground targets. Careful applications of STAP can effectively overcome these conditions by suppressing these interferences and maximize the signal to interference plus noise ratio (SINR). The Multi-stage Wiener filter (MWF) and principal component signal dependent (PC-SD) algorithm are two such methods that can suppress these interference through truncation of the signal subspace. This thesis makes contribution in several ways. First it details the importance of rank compression and sample compression for effective STAP operations in “sample starved” environments. Second, it shows how MWF and PC-SD could operate in this type of environment. Third it details how a “soft stop” technique like diagonal loading (DL) could improve STAP performance in target detection for MWF and PC-SD. Fourth, this thesis contrasts the performance of several existing “hard stop” techniques in rank compression and introduces a new one using a-priori knowledge.

Linear repetitive projects, which are resource-driven in nature, are characterized by a series of repetitive activities in which the resources share the same space either in sequential or parallel manner. The frequent movement of resources over limited shared space needs to be well-planned to avoid potential issues during the execution of linear projects. As such, schedules developed for these projects needs not only to take into account all the logical, project-dependent and precedence constraints of activities but also to incorporate the space and time constraints that co-exist for the movement of thei8r resources. Negligence in incorporating spatial and temporal constraints in developing and improving schedules of linear projects increases the risk of delays and workspace congestions that can substantially hinder the performance of the activity resources. The study presented here proposes and develops an uncertainty-aware scheduling and control framework for linear projects to address the needs mentioned above. For this purpose, first, a new type of float was introduced as the Space-Time Float. The Space-Time Float is an envelope for all possible movement patterns that a linear activity or its associated resources can take considering the time and space constraints of that activity. The next endeavor in the development of the uncertainty-aware linear scheduling and control framework was to augment the current linear scheduling methods by presenting an uncertainty-aware optimization method to optimize the duration of linear projects while minimizing their potential congestions. A constraint satisfaction approach was used for the two-tier optimization of duration and congestion, and a fuzzy inference system was incorporated to assess the inherent uncertainty in linear activities. A new type of buffer, Uncertainty-Aware Productivity Buffer is also introduced to account for the uncertainties inherent in project activities. Spatial progress of activities needs not only to be considered in the planning phase but also to be closely monitored during construction. The framework presented in this study also applies to the monitoring and control of linear projects. While most of the current methods still do not accommodate real-time bi-directional control of linear projects, this framework is based on the Cyber-Physical Systems (CPS) architecture and bi-directional communication of data. To this end, a CPS-based application for Earned Value (EV) monitoring and control of road and highway projects is presented. Different steps of the generated framework are validated through various literature and field-based case studies. The results demonstrate the effectiveness of the presented method in planning and control of unforeseen variations from the planned schedules of linear projects. As such, the present study contributes and adds to the current body of knowledge of linear projects by presenting an efficient scheduling and control framework that takes into account logical, spatio-temporal and project-based constraints of linear activities. / Thesis / Doctor of Philosophy (PhD)

No description available.