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Made available in DSpace on 2015-03-26T13:32:17Z (GMT). No. of bitstreams: 1 texto completo.pdf: 3004404 bytes, checksum: 18834db766750ae443a52c29a9b0decd (MD5) Previous issue date: 2012-07-24 / Fundação de Amparo a Pesquisa do Estado de Minas Gerais / Time series are sometimes influenced by disruptions of events, such as strikes, the outbreak of war, among others. These interrupts originate atypical observations or outliers that directly influence the homogeneity of the series, leading to erroneous inferences and interpretations of the variable under study, being very common in climatological data. So, in the interest of detecting outliers in time series of precipitation, this study aimed to establish a method of detecting outliers. For this, there was the junction of ARIMA models and methodologies of the classical geostatistics, the self-validation. The proposed criterion compares waste of time series analysis with confidence intervals of the residue of self-validation. We analyzed time series of average monthly rainfall for rainy days of 43 rainfall stations in the state of Minas Gerais, between the years 2000 to 2005. The analysis procedures ranging from the description of the periodicity through the periodogram to obtain validation, from the estimation of the semivariogram models by ordinary least squares methods and maximum likelihood. The results for the period under study, 165 were detected outliers, spread between the 43 rainfall stations. The station Campo Grande Ranch, located in the municipality of Passa Tempo, was the season in which they recorded the highest number of outliers, 45 in total. As the results, we considered the proposed method very efficient in detecting outliers, and therefore the analysis of the homogeneity of observations. / Séries temporais são algumas vezes influenciadas por interrupções de eventos, tais como greves, eclosão de guerras, entre outras. Estas interrupções originam observações atípicas ou outliers que influenciam diretamente na homogeneidade da série, ocasionando interpretações e inferências errôneas da variável sob estudo, sendo muito comum em dados climatológicos. Assim, com o interesse de detectar outliers em séries temporais de precipitação, o presente trabalho teve por objetivo estabelecer um método de detecção outliers. Para tal, realizou-se a junção da modelagem ARIMA e de uma das metodologias clássicas de geoestatística, a autovalidação. O critério proposto compara os resíduos da análise de séries temporais com intervalos de confiança dos resíduos da autovalidação. Foram analisadas séries temporais da precipitação média mensal por dias chuvosos de 43 estações pluviométricas localizadas no estado de Minas Gerais, entre os anos de 2000 a 2005. Os procedimentos de análise vão da descrição da periodicidade por meio do periodograma até a obtenção da autovalidação, à partir da estimação dos modelos de semivariograma pelos métodos de mínimos quadrados ordinários e máxima verossimilhança. Pelos resultados, para o período sob estudo, foram detectado 165 outliers, espalhados entre as 43 estações pluviométricas. A estação Fazenda Campo Grande, localizada no município de Passa Tempo, foi a estação em que se registrou o maior número de outliers, 45 no total. Conforme os resultados obtidos considerou-se o método proposto muito eficiente na detecção de outliers e, consequentemente, na análise da homogeneidade das observações.

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The Rhodesian and Zimbabwean space-time involved the creation and adoption of hegemonic discourses that influenced ways of behavior, thinking, perceiving reality and particular ways of identity construction based on mystifying nationalisms. In raced and politically charged spaces, such grand narratives depended, for their currency, on stereotypes, essentialisms, domination and dichotomization of ‘nation as narration’. The metanarratives of the two spaces functioned as discursive tools for the legitimation of particular forms of exclusions, elisions and distortions. As discursive and polemical literary tools, these discourses always found sustenance and perpetuation in the existence of a different other. In other words, these constructed narratives sought to use difference as a basis for scapegoating and naturalizing racial, economic, political and resource asymmetries in the Rhodesian and Zimbabwean spaces. Power was wielded not in the service of, but against, the majority who are marginalized. This study explores John Eppel’s writings on the constructions of both Rhodesia and Zimbabwe as ideological spaces for the legitimation of power based on class, race and politics. I argue that Eppel’s selected writings are a literary intervention that proffers a satirically dissident critique of the foundational myths, symbols and narratives of Rhodesian and Zimbabwean space-time. The study argues that Eppel offers literary resistance to unproblematized identity compositions predicated on socially constructed but skewed categories that limit the contours of belonging and citizenship. The Rhodesian space is viewed as a palimpsest upon which is overwritten the Zimbabwean patriotic discourse that also authorize racism, marginalization, power abuse and other forms of exclusion. In examining Eppel’s satiric disruption of both spaces, I use certain strands of the Postcolonial Theory that problematize issues of nation, identity, race, tribe and power. Its usefulness lies in its rejection of fixities, of absolutes and in its general counter-hegemonic thrust. I therefore invoke the theorizations of Frantz Fanon, Homi Bhabha, Maria Lara, Paul Gilroy, Mikhail Bakhtin and Benita Parry. These form the theoretical base with which the study confronts Eppel’s writings on Rhodesia and Zimbabwe. The focal texts used are: Absent: The English Teacher (2009), selected short stories in White Man Crawling (2007) and The Caruso of Colleen Bawn (2004), The Holy Innocents (2002), Hatchings (2006), selected poems from Spoils of War (1989), Songs my Country Taught me: Selected Poems 1965-2005(2005) and D.G.G.Berry’s The Great North Road (1992). I conclude by arguing that Eppel creates a fictional life-world where race, origin, politics, class and culture are figured as polarizing identity markers that should be re-negotiated and even transcended in order to materialize a more inclusive multicultural society. To the extent that both the colonial and post-independence eras cross-fertilize each other in terms of occlusions, creating hegemonic narratives, resort to race, violence, silencing and erasure of certain subjectivities, Eppel advocates the ‘hatching’ of a new national, moral and inclusive ethos that supersedes the claustrophobia of both spaces. / English Studies / D. Litt. et Phil.(English)

The need to learn programming increases as more jobs require basic programming skills and computer knowledge. Compulsory school is adding programming to the curriculum, which leads to challenges due to both teachers and students are new to this subject. Even at the university level some students get in touch with programming for the first time in their lives.  This thesis aim to develop a web application that can be used by teachers as a reliable and informative tool when evaluating the learning process of its students, by combining data collected through user interactions while solving programming related puzzles in Python, with answers from periodic self-evaluation surveys.  The study shows that the web application can be seen as a valid tool when evaluating the students' learning process.