Nowadays, power systems are dealing with some new challenges raisedby the major changes that have been taken place since 80’s, e.g., deregu-lation in electricity markets, significant increase of electricity demands andmore recently large-scale integration of renewable energy resources such aswind power. Therefore, system operators must make some adjustments toaccommodate these changes into the future of power systems.One of the main challenges is maintaining the system stability since theextra stress caused by the above changes reduces the stability margin, andmay lead to rise of many undesirable phenomena. The other important chal-lenge is to cope with uncertainty and variability of renewable energy sourceswhich make power systems to become more stochastic in nature, and lesscontrollable.Flexible AC Transmission Systems (FACTS) have emerged as a solutionto help power systems with these new challenges. This thesis aims to ap-propriately utilize such devices in order to increase the transmission capacityand flexibility, improve the dynamic behavior of power systems and integratemore renewable energy into the system. To this end, the most appropriatelocations and settings of these controllable devices need to be determined.This thesis mainly looks at (i) rotor angle stability, i.e., small signal andtransient stability (ii) system operation under wind uncertainty. In the firstpart of this thesis, trajectory sensitivity analysis is used to determine themost suitable placement of FACTS devices for improving rotor angle sta-bility, while in the second part, optimal settings of such devices are foundto maximize the level of wind power integration. As a general conclusion,it was demonstrated that FACTS devices, installed in proper locations andtuned appropriately, are effective means to enhance the system stability andto handle wind uncertainty.The last objective of this thesis work is to propose an efficient solutionapproach based on Benders’ decomposition to solve a network-constrained acunit commitment problem in a wind-integrated power system. The numericalresults show validity, accuracy and efficiency of the proposed approach. / <p>The Doctoral Degrees issued upon completion of the programme are issued by Comillas Pontifical University, Delft University of Technology and KTH Royal Institute of Technology. The invested degrees are official in Spain, the Netherlands and Sweden, respectively.QC 20141028</p>

O presente estudo baseia-se na vivência do pesquisador como membro participante de assembléias realizadas e organizadas pelos índios Ingarikó, em 2005, em Roraima, especificamente na Terra Indígena Raposa Serra do Sol. Essas assembléias visavam discutir as alternativas de gestão do território ocupado pelo grupo Ingarikó, em função da dupla afetação do mesmo como Terra Indígena e Unidade de Conservação. O pesquisador se inscreveu como membro das assembléias, a partir de um convite a ele formalizado por uma liderança Ingarikó, tendo exercido o papel de articulador da organização indígena denominada Conselho do Povo Indígena Ingarikó (Coping), recém-criada nos momentos que antecederam as assembléias. Participaram dessas assembléias, além das lideranças e de membros das comunidades Ingarikó, representantes dos órgãos governamentais envolvidos com a gestão de Terras Indígenas e de Unidades de Conservação, no âmbito local e federal, dentre os quais assumem relevância no presente estudo a Fundação Nacional do Índio (Funai) e, à época, o Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (Ibama). Tal condição permitiu ao pesquisador, na qualidade de observador participante das referidas assembléias, levantar e analisar informações que propiciaram o conhecimento de como se dava a ação do grupo Ingarikó no exercício da gestão política do território em questão. Essa ação indicou haver uma apropriação da categoria Parque Nacional de forma específica pelo grupo, denotando aspiração de soberania nas decisões e ações, políticas e de gestão, sobre o futuro das regras e técnicas de uso do território. Essa indicação baseou-se na observação das formas de condução das assembléias, na convivência do pesquisador no contexto do modo de vida Ingarikó e nas verbalizações ocorridas durante as assembléias e em conversas com membros da comunidade. Além disso, a observação fundamentou a percepção de que o chamamento das assembléias pelos Ingarikó, assim como o seu desenvolvimento, refletiam um aprendizado dos índios com relação aos modelos de desempenho de ações políticas exercidas pelos atores institucionais do Ibama, da Funai e de organizações indígenas, permitindo também o fortalecimento de uma identidade Ingarikó. Em síntese, a análise do desenrolar das assembléias, em sua totalidade, levou à abstração de que havia, subentendida no comportamento do grupo Ingarikó, uma vinculação entre o respeito aos direitos indígenas sobre as terras que ocupam e a conservação ambiental, conforme estabelecido nos fundamentos originais que justificaram a constituição histórica da legislação indígena do Estado brasileiro, cuja política está centralizada na categoria jurídica Terra Indígena. Paradoxalmente, foi possível constatar que essa essencial vinculação não está presente na forma como as políticas públicas indigenistas e ambientais se materializam, exigindo, de seus agentes, um esforço na busca de articulação das mesmas na ação. / The present study was based on the experience of one researcher participating in assemblies organized and conducted by the Ingariko tribe in the Indian lands known as the Raposa Serra do Sol, in the state of Roraima, Brazil. These assemblies, held in 2005, were aimed at discussing alternative forms of managing the territory occupied by the Ingariko tribe, a territory that, in addition to having been officially set aside for use by indigenous peoples, has been designated an environmentally protected area (Mount Roraima National Park). The researcher was formally invited to participate in the assemblies by one of the leaders of the Ingariko tribe. The invitation came as a result of the coordinating role played by the researcher in the organization known as the Ingariko Indigenous Peoples Council, which was created in the weeks leading up to the assemblies. In addition to the leaders and members of the Ingariko villages, representatives of governmental agencies involved in the management of Indian lands and environmentally protected areas were in attendance. Among such agencies were the Fundação Nacional do Índio (Funai, National Indian Foundation) and the Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (Ibama, Brazilian Institute for the Environment and Renewable Natural Resources). During these assemblies, the researcher, in the role of participating observer, was able to raise questions and analyze information regarding the activism of the Ingariko tribe in influencing the political management of the disputed territory. The researcher noted that the intervention by members of the tribe resulted in their appropriation of the classification \'National Park\' in a form specific to the tribe, denoting an aspiration to have sovereignty in making decisions and plans, in terms of policies and management, regarding the future use of the territory. This conclusion was reached based on the manner in which the assemblies were conducted and on the personal experience of the researcher, who was familiar with the Ingariko way of life, as well as on statements made during the assemblies and in conversations with members of the community. In addition, the fact that the Ingariko called for and organized these assemblies indicates their political maturation in relation to models of political activities sanctioned by the institutional actors (Ibama, Funai and other organizations involved in indigenous issues), as well as the strengthening of the Ingariko cultural identity. In summary, the analysis of the way in which the assemblies proceeded, overall, and of the behavior of the Ingariko tribe, led to the abstraction that respect for Indian land rights and environmental conservation are inextricably linked. This link has its foundation in the constitutional and legislative history of Brazil in relation to Indian rights and issues affecting indigenous peoples, the central focus of which, in legal terms, is Indian lands. Paradoxically, it became apparent that this essential link is not taken into consideration during the formation of public policies related to indigenous and environmental issues. Therefore, public officials must consciously attempt to incorporate this idea into their interpretation and implementation of such policies.

This thesis is focused on a firmware for robotic vehicle based on the ARM Cortex-M3 architecture that is running a real-time operating system (RTOS). Theoretical part describes available solutions of embedded RTOS and concrete HW implementation of the robotic vehicle. There is also comparison of the three selected RTOS with their measurements. Result of this thesis is base firmware compounded by a program modules that controls HW parts. There is also a sample PC and firmware application that extends base firmware. This sample application is able to communicate with robotic vehicle, control wheel motion and measure process data.

This Master's project deals with implementation of uC/OS-II real-time operating system on FITkit 3 platform, its testing and proving its functionality with simple examples. Describes an example of uC/OS-II application for displaying images on a E-ink display and application of ECCA method for increasing fault tolerance of the system.

Speech as a medium for communication has always been important in its ability to convey our ideas, personality and emotions. It is therefore not strange that Quality of Experience (QoE) becomes central to any business relying on voice communication. Using Unified Communication (UC) systems, users can communicate with each other in several ways using many different devices, making QoE an important aspect for such systems. For this thesis, automatic methods for assessing speech quality of the voice calls in Briteback’s UC application is studied, including a comparison of the researched methods. Three methods all using a Gaussian Mixture Model (GMM) as a regressor, paired with extraction of Human Factor Cepstral Coefficients (HFCC), Gammatone Frequency Cepstral Coefficients (GFCC) and Modified Mel Frequency Cepstrum Coefficients (MMFCC) features respectively is studied. The method based on HFCC feature extraction shows better performance in general compared to the two other methods, but all methods show comparatively low performance compared to literature. This most likely stems from implementation errors, showing the difference between theory and practice in the literature, together with the lack of reference implementations. Further work with practical aspects in mind, such as reference implementations or verification tools can make the field more popular and increase its use in the real world.

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This thesis deals with issue of reliability of real-time embedded systems. Contains a summary of basic concepts related to field in real-time embedded systems and mechanisms for dependability enhancement through redundancy techniques and control flow checking. Describes the implementation of selected control flow checking mechanisms, the technique uses software watchdog timers, use of hardware n-modular redundancy in software environment and technique of process pairs using operating system uC/OS-II. The different mechanisms are validated by method injection of faults into the chosen data structures of system uC/OS-II.

No description available.

No description available.