Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (p. 99-105).

Thesis (Ph.D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Yucel Altunbasak; Committee Member: Chuanyi Ji; Committee Member: Ghassan AlRegib; Committee Member: Ozlem Ergun; Committee Member: Russell M. Mersereau.

Thesis (M.Arch.) - Carleton University, 2007. / Includes bibliographical references (p. 106-109). Also available in electronic format on the Internet.

Thesis (Ph. D.)--University of Texas at Austin, 2006. / Vita. Includes bibliographical references. Includes filmography and discography.

Thesis (M.S.)--Rochester Institute of Technology, 2008. / Typescript. Includes bibliographical references (leaves 59-60).

Thesis (M.S.)--University of Missouri-Columbia, 2004. / Typescript. Includes bibliographical references (leaves 90-92). Also available on the Internet.

H παρούσα πτυχιακή εργασία επικεντρώνεται αρχικά, στη μελέτη των προτύπων της επίγειας και φορητής ψηφιακής τηλεοράσης (DVB-T και DVB-H). Το DVB-T αποτελεί τo πρότυπο της επίγειας µετάδοσης που έχει αναπτυχθεί µε ιδιαίτερα πολύπλοκο τρόπο από ότι τα προηγούµενα πρότυπα για δορυφορική και καλωδιακή µετάδοση. Με το DVB-T επιτυγχάνονται καλύτερες επιδόσεις απ’ ότι µε την αναλογική μετάδοση και προσφέρει πολλά πλεονεκτήµατα στην επίγεια µετάδοση αλλά και λήψη του σήµατος. Επειδή αποδείχθηκε σχετικά νωρίς ότι το DVB-T έχει μειονεκτήματα σε ότι αφορά το broadcasting τηλεοπτικού σήματος σε κινητά τηλέφωνα, γεννήθηκε η ιδέα για ένα σύστημα αποκλειστικά για φορητές συσκευές βασισμένο στο DVB-T. Καλείται DVB-H (DVB-Handheld). Δεδομένου ότι τα συστήματα ψηφιακής μετάδοσης DVB-T και DVB-H χρησιμοποιούν για τη διάδοσή τους το επίγειο και δορυφορικό κανάλι, γίνεται εκτενής ανάλυση των παραμέτρων που επηρεάζουν την επίγεια και δορυφορική μετάδοση, κυρίως από την οπτική των απωλειών. Στη συνέχεια, γίνεται ανάλυση όλων των σταδίων που λαμβάνουν χώρα κατά την εκπομπή και λήψη ενός OFDM σήματος μέσω ενός φυσικού καναλιού, διαμόρφωση η οποία χρησιμοποιείται κατά κόρον στα πρότυπα DVB-T και DVB-H. Έπειτα, προσομοιώνουμε μέσω του MATLAB όλη τη διαδικασία της OFDM μετάδοσης και λήψης, εξάγοντας τις γραφικές παραστάσεις με τη μορφή του OFDM σήματος σε κάθε στάδιο. Τέλος, θα μελετήσουμε την επίδραση του ασύρματου καναλιού (δορυφορικού και επίγειου) στην εξασθένηση του OFDM σήματος, στο σταθμό λήψης και θα εξάγουμε τις γραφικές παραστάσεις, επιβεβαιώνοντας την εξασθένηση αυτή. / This project focuses initially on the study of patterns of terrestrial and mobile digital television (DVB-T and DVB-H). The DVB-T standard is the terrestrial broadcasting standard that has been developed in a very complex way than previous standards for satellite and cable broadcasting. By implementing DVB-T we can achieve much better performance than analog transmission as it offers many advantages for terrestrial transmission and reception. Since it has been proved early on that the DVB-T has disadvantages in terms of the broadcasting of television signals to mobile phones, there has been created an idea for a system that exclusively focuses on mobile devices, based on DVB-T. It is called DVB-H (DVB-Handheld). Since the digital broadcasting systems of DVB-T and DVB-H use the terrestrial and satellite channel to transmit information, an extensive analysis of parameters affecting the terrestrial and satellite transmission takes place, mainly from the perspective of losses. Then, there takes place an analysis of all stages that occur when transmitting and receiving an OFDM signal through a natural channel, modulation which is widely used in DVB-T and DVB-H. Then, we run a MATLAB simulation for the whole process of OFDM transmission and reception, exporting graphs of the form of the OFDM signal at each stage. Finally, we will study the effect of wireless channel (satellite and terrestrial) as far as the weakening of the OFDM signal is concerned at the receiving station and we will export the graphs, confirming the aforementioned attenuation. .

abstract: This dissertation presents reflective teaching practices that draw from an object-oriented rhetorical framework. In it, practices are offered that prompt teachers and students to account for the interdependent relationships between objects and writers. These practices aid in re-envisioning writing as materially situated and leads to more thoughtful collaborations between writers and objects. Through these practices, students gain a more sophisticated understanding of their own writing processes, teachers gain a more nuanced understanding of the outcomes of their pedagogical choices, and administrators gain a clearer vision of how the classroom itself affects curriculum design and implementation. This argument is pursued in several chapters, each presenting a different method for inciting reflection through the consideration of human/object interaction. The first chapter reviews the literature of object oriented rhetorical theory and reflective teaching practice. The second chapter adapts a methodology from the field of Organizational Science called Narrative Network Analysis (NNA) and leads students through a process of identifying and describing human/object interaction within narratives and asks students to represent these relationships visually. As students undertake this task they can more objectively examine their own writing processes. In the third chapter, video ethnographic methodologies are used to observe object oriented rhetoric theory in practice through the interactions of humans and objects in the writing classroom. Through three video essays, clips of footage taken of a writing classroom and its writing objects are selected and juxtaposed to highlight the agency and influence of objects. In chapter four, a tool developed using freely available cloud-based web applications is presented which is termed the “Fitness Tracker for Teaching.” This tool is used to regularly collect, store, and analyze data that students self-report through a daily class survey about their work efforts, their work environment, and their feelings of confidence, productivity, and self-efficacy. The data gathered through this tool provides a more complete understanding of student effort and affect than could be provided by the teacher’s and students’ own memories or perceptions. Together these chapters provide a set of reflective practices that reinforce teaching writing as a process that is affective and embodied and acknowledges and accounts for the rhetorical agency of objects. / Dissertation/Thesis / Chapter 3 Video Presentation / Doctoral Dissertation English 2017

Esta dissertação apresenta o estudo, a melhoria e a implementação de um algoritmo para avaliar a qualidade de vídeo baseado na relevância dos objetos nos quadros. A métrica usada para estimar a relevância tem como pré-requisito a segmentação do vídeo. O trabalho foi dividido em etapas distintas: (1) segmentação, (2) avaliação da segmentação e estimação da relevância, (3) geração de artefatos nos vídeo originais e (4) avaliação de qualidade de vídeo. Experimentos com diferentes artefatos comprovam a eficiência da métrica proposta em termos de correlação com a métrica subjetiva. / This work presents the study, improvement and implementation of an algorithm to evaluate the video quality based on the relevance of objects in the frames. The measurements used to estimate the relevance requires a segmentation of objects. The work was divided into the following sections: (1) segmentation, (2) evaluation of segmentation and estimation of relevance, (3) generation of artifacts in video original and (4) evaluation of video quality. Experiments with different artifacts prove the efficiency of the proposed metric in terms of correlation with subjective measures

Esta dissertação apresenta o estudo, a melhoria e a implementação de um algoritmo para avaliar a qualidade de vídeo baseado na relevância dos objetos nos quadros. A métrica usada para estimar a relevância tem como pré-requisito a segmentação do vídeo. O trabalho foi dividido em etapas distintas: (1) segmentação, (2) avaliação da segmentação e estimação da relevância, (3) geração de artefatos nos vídeo originais e (4) avaliação de qualidade de vídeo. Experimentos com diferentes artefatos comprovam a eficiência da métrica proposta em termos de correlação com a métrica subjetiva. / This work presents the study, improvement and implementation of an algorithm to evaluate the video quality based on the relevance of objects in the frames. The measurements used to estimate the relevance requires a segmentation of objects. The work was divided into the following sections: (1) segmentation, (2) evaluation of segmentation and estimation of relevance, (3) generation of artifacts in video original and (4) evaluation of video quality. Experiments with different artifacts prove the efficiency of the proposed metric in terms of correlation with subjective measures