Zugl.: München, Techn. Universiẗat, Diss., 2008.

abstract: The Resource Description Framework (RDF) is a specification that aims to support the conceptual modeling of metadata or information about resources in the form of a directed graph composed of triples of knowledge (facts). RDF also provides mechanisms to encode meta-information (such as source, trust, and certainty) about facts already existing in a knowledge base through a process called reification. In this thesis, an extension to the current RDF specification is proposed in order to enhance RDF triples with an application specific weight (cost). Unlike reification, this extension treats these additional weights as first class knowledge attributes in the RDF model, which can be leveraged by the underlying query engine. Additionally, current RDF query languages, such as SPARQL, have a limited expressive power which limits the capabilities of applications that use them. Plus, even in the presence of language extensions, current RDF stores could not provide methods and tools to process extended queries in an efficient and effective way. To overcome these limitations, a set of novel primitives for the SPARQL language is proposed to express Top-k queries using traditional query patterns as well as novel predicates inspired by those from the XPath language. Plus, an extended query processor engine is developed to support efficient ranked path search, join, and indexing. In addition, several query optimization strategies are proposed, which employ heuristics, advanced indexing tools, and two graph metrics: proximity and sub-result inter-arrival time. These strategies aim to find join orders that reduce the total query execution time while avoiding worst-case pattern combinations. Finally, extensive experimental evaluation shows that using these two metrics in query optimization has a significant impact on the performance and efficiency of Top-k queries. Further experiments also show that proximity and inter-arrival have an even greater, although sometimes undesirable, impact when combined through aggregation functions. Based on these results, a hybrid algorithm is proposed which acknowledges that proximity is more important than inter-arrival time, due to its more complete nature, and performs a fine-grained combination of both metrics by analyzing the differences between their individual scores and performing the aggregation only if these differences are negligible. / Dissertation/Thesis / M.S. Computer Science 2010

abstract: Most existing approaches to complex event processing over streaming data rely on the assumption that the matches to the queries are rare and that the goal of the system is to identify these few matches within the incoming deluge of data. In many applications, such as stock market analysis and user credit card purchase pattern monitoring, however the matches to the user queries are in fact plentiful and the system has to efficiently sift through these many matches to locate only the few most preferable matches. In this work, we propose a complex pattern ranking (CPR) framework for specifying top-k pattern queries over streaming data, present new algorithms to support top-k pattern queries in data streaming environments, and verify the effectiveness and efficiency of the proposed algorithms. The developed algorithms identify top-k matching results satisfying both patterns as well as additional criteria. To support real-time processing of the data streams, instead of computing top-k results from scratch for each time window, we maintain top-k results dynamically as new events come and old ones expire. We also develop new top-k join execution strategies that are able to adapt to the changing situations (e.g., sorted and random access costs, join rates) without having to assume a priori presence of data statistics. Experiments show significant improvements over existing approaches. / Dissertation/Thesis / M.S. Computer Science 2011

Studien som här sammanfattas är kvantitativ och börjar med en redogörelse av tidigare forskning inom ämnena, medarbetarskap, top-down – bottom-up, samt street level bureaucacy. Därefter redovisas den teoretiska referensramen som arbetet utgått från; Dochertys organisatoriska lärande. En svensk kommun bestående av omkring 10 000 medarbetare har använts som population till arbetet hos vilken en surveyundersökning genomförts. Syftet med studien var att undersöka relationen mellan lärande och medarbetarskap. Fokusområden har varit individens lärande inom organisationen liksom hur detta påverkat deras intryck av sitt medarbetarskap. Det resultat som framkommit visar att lärande är bidragande till ett välmående medarbetarskap. Slutligen skildras en analys av resultatet som sedan leder till en diskussion.

The thesis results of two laboratory experiments focusing on the impacts of predation risk, prey density and habitat complexity on predator-prey interaction strengths and predator metabolic rates, complemented by a brief review of the subject. The experimental system used in the first experiment consisted of cladoceran prey, larvae of three dragonfly species (Sympetrum sanguineum, Libellula quadrimaculata, Ischnura cf. elegans) as intermediate predators, and larvae of a large dragonfly species (Aeshna sp.) as a top predator. The second experiment of investigated how predation risk influences metabolic rates of the intermediate predators.

Summary The thesis deals with the effect of mechanic invasion and top dressing applications on the quality of the lawn's greensward and weight of the root system of the plant. The aim of this thesis was to evaluate the effect of aeration, verticutation and top dressing in terms of support of plant root system, the presence of weeds in the lawn and also effect on the color of the grass and compactness of the lawn. Made mechanization interventions were evaluated without further intervention, verticutation and aeration. Application of top dressing is evaluated with and without step. The experiment was turfed in the Central region, twenty kilometers southeast of Prague. The greatest effect (P<0,05) on the weight of the root system should aeration with verticutation and smallest (P<0,05) the weight of the root system had lawn without mechanization invasion. In evaluating the compactness of the lawn was rated verticutation (P<0,05) as the worst. The best (P<0,05) color had lawn without any mechanized invasion and least (P<0,05) weed species was found out in combination of aeration and verticutation. Application of organic top dressing showed a positive effect on the weight of the root system. It was also found lower incidence of weeds. For top dressing applications has not been demonstrated a positive effect on the colour of the lawn. Application of top dressing had a positive effect on compactness of the lawn.

Doctor of Philosophy / Department of Psychological Sciences / Lester C. Loschky / Political videos are created as persuasive media, and at a basic level that persuasion would require that the videos guide viewer attention to the relevant persuasive content. Recent work has shown that filmmakers have techniques that allow them to guide where viewers look, and this guidance occurs even when viewers have very different understandings of the film. The current research tested if these attentional effects carry over to political videos, or if the top-down factors of attitude congruence and social vigilantism, belief superiority and the tendency to impress one’s “superior” beliefs on others (O'Dea, Bueno, & Saucier, 2018; Saucier & Webster, 2010; Saucier, Webster, Hoffman, & Strain, 2014), will break the ability of videos to guide viewers’ attention. Attentional selection was measured through participants’ eye movements, and memory encoding was measured through recall and recognition for both verbal and visual information. Three overarching competing hypotheses predicted different relationships between attitude congruence, social vigilantism, and visual attention and memory. The Tyranny of Film Hypothesis predicted that the videos would guide viewer attention, regardless of attitude congruence. This would result in similar eye-movements and memory for all participants. The Selective Exposure Hypothesis predicted that participants would avoid processing attitude-incongruent information. As a result, viewers’ visual attention would be directed away from attitude-incongruent information, and subsequent memory would be worse. Lastly, the Social Vigilantism Hypothesis predicted that people high in Social Vigilantism would engage more with attitude-incongruent information. Two experiments tested these hypotheses. The first was the Memory experiment (conducted online), and the second was the Eye movement experiment. In each experiment, participants watched a series of political advertisement and debate videos, and attitudes were measured to identify which information in the videos was attitude-congruent and incongruent. The Memory experiment showed some support for the Social Vigilantism Hypothesis, with People high in Social Vigilantism having better memory for attitude-incongruent information on certain memory measures. Conversely, the Eye movement experiment consistently showed strong stimulus driven effects in support of the Tyranny of Film, but also weaker attitude and social vigilantism effects that were independent of attitude congruence. Altogether, these results show dynamic video stimuli features are the best predictors of viewer attention and memory, but viewer attitude and social vigilantism have subtle top-down effects. The support for different hypotheses between the two experiments indicates the strength of top-down effects may depend on the format of the viewing experience, and specifically how much control the viewer has over the experience.

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Direito, Programa de Pós-Graduação em Direito, 2018. / Submitted by Raquel Almeida (raquel.df13@gmail.com) on 2018-05-15T15:47:01Z No. of bitstreams: 1 2018_VictorOliveiraFernandes.pdf: 2203164 bytes, checksum: 7ad140f25258e6eb1c8529479d6651b8 (MD5) / Approved for entry into archive by Raquel Viana (raquelviana@bce.unb.br) on 2018-06-05T12:54:35Z (GMT) No. of bitstreams: 1 2018_VictorOliveiraFernandes.pdf: 2203164 bytes, checksum: 7ad140f25258e6eb1c8529479d6651b8 (MD5) / Made available in DSpace on 2018-06-05T12:54:35Z (GMT). No. of bitstreams: 1 2018_VictorOliveiraFernandes.pdf: 2203164 bytes, checksum: 7ad140f25258e6eb1c8529479d6651b8 (MD5) Previous issue date: 2018-06-04 / Esta dissertação trata da regulação de serviços baseados na internet, comumente chamados de serviços over-the-top (OTT). Em especial, o objetivo do estudo é analisar o regime jurídicosetorial aplicável aos serviços OTT de voz definido a partir da atuação das agências reguladoras de telecomunicações norte-americana e brasileira no recorte temporal das últimas duas décadas. Com base em teorias que consubstanciam prescrições normativas sobre como regular serviços de telecomunicações e internet no contexto pós-convergência tecnológica, o trabalho busca responder à seguinte pergunta de pesquisa: as atuações das agências reguladoras nacionais de telecomunicações no período histórico analisado têm resultado na construção de regimes jurídicos estáveis e horizontais em mercados funcionalmente equivalentes? De início, apontase uma hipótese negativa, tendo em vista as assimetrias regulatórias a que estão submetidos os serviços de telecomunicações e de internet potencialmente substitutivos nas jurisdições analisadas. O expediente investigativo se desenvolve em quatro capítulos. No Capítulo 1, é feita uma breve revisão da ainda incipiente literatura sobre serviços OTT, destacando-se os seus principais aspectos regulatórios controversos e a importância da atuação das agências reguladoras de telecomunicações, no limite da sua competência, para a definição do regime jurídico setorial aplicável àqueles serviços. No Capítulo 2, é realizada uma explicação pormenorizada das teorias de regulação utilizadas neste estudo, destacando-se três prescrições que delas derivam e que são fixadas como variáveis de análise do objeto de pesquisa delimitado. No Capítulo 3, são examinados o enquadramento jurídico dos serviços OTT no âmbito do Telecommunications Act de 1996 e o processo histórico de conformação dos direitos e das obrigações regulatórias aplicáveis aos serviços OTT de voz nessa jurisdição pela Federal Communications Commision (FCC). No Capítulo 4, analisa-se o enquadramento dos serviços OTT na Lei Geral de Telecomunicações (LGT), bem como as possibilidades de regulação desses serviços na interface entre a LGT e o Marco Civil da Internet (MCI). Investiga-se de que forma a Agência Nacional de Telecomunicações (ANATEL) tem definido o regime jurídico setorial dos serviços OTT de voz nos últimos anos e quais são os principais desafios atuais envolvidos na superação das assimetrias regulatórias existentes entre serviços de telecomunicações e os Serviços de Valor Adicionado (SVA). Por fim, a conclusão do trabalho consolida os resultados da análise das experiências nacionais comparadas, apontando em relação a elas (i) uma coincidência quanto ao diagnóstico de insuficiência da bipolaridade normativa entre serviços de telecomunicações e serviços de internet; (ii) uma divergência, ainda que parcial, quanto ao manejo de políticas regulatórias incrementais na definição das obrigações econômicas e sociais aplicáveis os serviços OTT de voz; e (iii) uma ausência comum de perspectivas de reformas estruturais voltadas ao estabelecimento de regimes jurídicos estáveis e horizontais em mercados funcionalmente equivalentes. / This dissertation analyses the regulation of internet-based services, commonly known as overthe-top services (OTT). The study examines the regulatory framework applicable to OTT voice services in light of decisions and procedures implemented by the telecommunications regulatory agencies in USA and Brazil over the last two decades. It addresses the following research question: have the decisions and procedures implemented by the telecommunications regulatory agencies constructed a regulatory framework that apply the same rules to substitutes services? The initial hypothesis is negative, due to distinct regulatory rules applicable to telecommunications operators and internet firms in both jurisdictions. The analysis is undertaken in four chapters. In Chapter One, the dissertation engages in a short review of the currently scarce literature related to OTT regulation. In Chapter Two, it explores legal theories that offer normative prescriptions for regulating telecommunications and internet-based services in the so-called post-technological convergence era. In Chapter Three, it analyses the classification of services established by the North American Telecommunications Act of 1996 and the regulatory procedures related to OTT voice services which were implemented by the Federal Communications Commission (FCC) over the last two decades. In Chapter Four, the dissertation analyses the legal framework of OTT in Brazil, under the General Telecommunications Law and the Brazilian Civil Rights Framework for the Internet. It examines how the Brazilian telecommunications agency (Agência Nacional de Telecomunicações – ANATEL) has treated OTT voice services during the analyzed period. It also addresses the current challenges for overcoming regulatory asymmetries between telecommunications services and value-added services in Brazil. In its conclusion, the comparative regulatory analysis indicates (i) an undisputed insufficiency of the legal dichotomy between telecommunications and value-added services; (ii) a partial difference in the implementation of incremental regulatory strategies applicable to OTT voice services and (iii) a common lack of perspective of structural reforms that could establish convergent regulatory policies in functional equivalent markets.

Made available in DSpace on 2014-06-11T19:24:08Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-02-19Bitstream added on 2014-06-13T20:12:03Z : No. of bitstreams: 1 alencarjunior_ea_me_arafo_prot.pdf: 747787 bytes, checksum: fd32e276778e87934566a313af1035b5 (MD5) / O objetivo desta pesquisa foi avaliar a influência da distância de uma fonte de luz halógena na microdureza superficial da resina composta, considerando as superfícies de topo e base dos corpos-de-prova. Foram utilizadas duas marcas comerciais de resina composta, Z250 de partículas pequenas e uma resina de micropartícula, A110, ambas da 3M do Brasil Ltda. O aparelho de ativação da resina composta foi K&M 220- R, cuja intensidade de luz possui um pulso que variava após os 5 primeiros segundos assim alcançando sua intensidade máxima que foi medida em 720 mW/cm2. Para a determinação da intensidade de luz emitida pelo aparelho fotoativador, utilizou-se um radiômetro (Medidor de irradiância 150- CMC , São Carlos - SP). Corpos-de-prova foram confeccionados utilizado-se matrizes metálicas que possuíam um orifício central de 4mm de diâmetro por 2mm de espessura. As resinas foram inseridas no orifício da matriz metálica, em um único incremento, por meio de uma espátula metálica e sobre elas foi sobreposta uma tira matriz transparente de poliéster e, após isto, um peso de 1 Kg foi posto em cima da tira para que houvesse uma melhor condensação da resina composta evitando a presença de bolhas de ar, no interior do corpo-de-prova. A fonte de luz halógena foi fixada em uma mesa de maneira que a saída da ponta de luz ficasse paralela à superfície do corpo-de-prova. Para provocar o distanciamento da fonte de luz, anéis metálicos confeccionados em latão, com espessuras que variavam de 2mm, 4mm e 8mm foram utilizados, os quais, após posicionados, eram removidos para não interferiem no dispersamento da luz. As distâncias imprimidas a fonte de luz na superfície da resina foram de 0mm(tocando a superfície), 2mm, 4mm e 8mm. Para cada uma destas distâncias, a intensidade de luz foi medida. Esta variou de intensidade de... . / The aim of this research was to evaluate the influence of the light tip distance in the superficial microhardness of the composite resin, considering the surfaces of top and base of the samples. Two commercial composite resin marks had been used, Z250 of small particles e a microparticle resin, A110, both of 3m of Brazil Ltda. The device of activation of the composite resin was K&M 220- R, whose intensity of light possess a pulse that varied the 5 first seconds after thus reaching its maximum intensity that was measured in 720 mW/cm2. For the determination of the intensity of light emitted for the fotoativador device, a radiometer (Measuring of irradiance 150- CMC was used, Is Carlos. SP). The samples had been confectioned used first metallic that had a central orifice of 4mm of diameter for 2mm of thickness. The resins had been inserted in the orifice of the metallic array, in an only increment, by means of a metallic spatula and on them a transparent first polyester strap was overlapped and, after this, one weight of 1 kg was rank in top of the strap so that it had one better condensation of the composite resin preventing the presence of air bubbles, in the inward of the body-of-test. The source of light was fixed in a table thus the output of the light tip was parallel to the surface of the body-of-test. To provoke distance from the light source, confectioned metallic rings in brass, with thickness that varied of 2mm, 4mm and 8mm had been used, which, after located, was removed to avoid concentration of light. The printed pitches the source of light in the surface of the resin had been of 0mm(on the surface), 2mm, 4mm and 8mm. For each one of these pitches, the light intensity was measured. This varied of intensity of 720 mW/cm2 for the tip touching the surface of the body-of-test, 650 mW/cm2 for in the distance of 2mm, 600 mW/cm2... (Complete abstract, click electronic address below).

Abstract Internal rotation in symmetric top molecules offers an excellent opportunity to investigate large amplitude motion in a relatively simple intramolecular environment. Due to specific symmetry characteristics of a symmetric top molecular frame, the internal rotation degree of freedom is in the zeroth order approximation separable from the small amplitude vibrations and the overall rotation, thus enabling to characterize the vibrational-torsional-rotational energy structure with a relatively simple Hamiltonian. Lessons from symmetric internal rotor studies may be applied to more complex systems, such as asymmetric internal rotors and macromolecules. This thesis deals with internal rotation in CH3SiH3, CH3SiD3, CH3CF3 which have become a prototype of symmetric internal rotors. The thesis presents high resolution vibration-torsion-rotation spectra and detailed analysis of these molecules. Particular attention is focused on torsion-mediated interactions, such as Coriolis-type interactions and Fermi-type interactions, coupling the internal rotation and the small amplitude vibrational motion. The studies show that the expansion of the data to the small amplitude vibrations and inclusion of the torsion-mediated interactions play a crucial role in order to obtain an appropriate characterization of the vibrational-torsional-rotational energy level structure and physically meaningful molecular parameters.