In the application of power inverters, power density has become a key design specification where it has stringent requirements on system size and weight. Achieving high power density need to combine lasted wide bandgap (WBG) device technology and high switching frequency to reduce passive filter size thus further shrink overall space. While still maintaining decent power conversion efficiency and low electromagnetic interference (EMI) with higher switching frequency, soft-switching needs to be implemented. A novel auxiliary resonant snubber is introduced. The design and operation are carried out, in which this snubber circuitry enables main Gallium Nitride (GaN) switches operating under zero voltage switching (ZVS) condition, and auxiliary Silicon Carbide (SiC) diodes switching under zero current switching (ZCS) condition. Besides, the auxiliary snubber circuitry gating algorithm is also optimized which allows reduction of the switching and conduction loss in auxiliary GaN switches to obtain higher system efficiency and better thermal performance. Here, this novel auxiliary resonant snubber circuitry is applied to a traditional full bridge inverter with flexible modulation suitability. This proposed inverter can be applied to a wide range of potential applications, such as string solar inverter, renewable energy combined distributed generation, dc-ac part of bi-directional electrical vehicle (EV) on-board charger, and uninterruptible power supply (UPS), etc. / Master of Science / This thesis combined an innovated resonant snubber circuit to resonate with traditional robust inverter topology with latest semiconductor devices implemented to achieve a high efficiency, high performance, low profile inverter system. During the design procedure, control algorithm had been optimized, novel semiconductor devices were utilized, and comprehensive operation analyses were delivered. Finally an efficient and robust system was constructed and achieved the design goals. With the reduction of non-renewable energy consumptions, the research work of this thesis carried out a novel inverter topology which can become a prominent candidate for tremendous applications such as solar panel, electrical vehicle charging, and other renewable energy sources.

The exponential growth of the World Wide Web (WWW) on the Internet and accompanying WWW browsers has promoted opportunities for new methods of teaching and learning. Teaching does not simply involve presenting textual information over the Internet along with a few hyperlinks, but requires effective user engagement with the teaching module. This is the main challenge in website design. The objective of this thesis is the development of an effective training module made available over the Internet so as to train acquisition and maintenance personnel on how they can use VHDL to design and maintain digital systems. The educational modules provide extensive information on VHDL modeling and testing styles and standards at various abstraction levels. The Sobel edge detector model was chosen as an example to explain the various concepts of modeling and testing. This model was chosen since it was thought to be simple enough for any student to understand, yet complex enough to explain most of the VHDL concepts of modeling and testing. The course material on test bench development at various levels of abstraction, reuse of test bench models, use of configurations for simulation of mixed abstraction and mixed data type models, testing techniques and WAVES was developed as a part of the current thesis. Finally a complete section on website design has been included which explains the design strategy adopted for developing the website and the various key issues involved in presenting teaching modules over the Internet. / Master of Science

It is critical to understand WWW latency in order to design better HTTP protocols. In this study we characterize Web response time and examine the effects of proxy caching, network bandwidth, traffic load, persistent connections for a page, and periodicity. Based on studies with four workloads, we show that at least a quarter of the total elapsed time is spent on establishing TCP connections with HTTP/1.0. The distributions of connection time and elapsed time can be modeled using Pearson, Weibul, or Log-logistic distributions. We also characterize the effect of a user's network bandwidth on response time. Average connection time from a client via a 33.6 K modem is two times longer than that from a client via switched Ethernet. We estimate the elapsed time savings from using persistent connections for a page to vary from about a quarter to a half. Response times display strong daily and weekly patterns. This study finds that a proxy caching server is sensitive to traffic loads. Contrary to the typical thought about Web proxy caching, this study also finds that a single stand-alone squid proxy cache does not always reduce response time for our workloads. Implications of these results to future versions of the HTTP protocol and to Web application design also are discussed. / Master of Science

Este trabalho pretende estudar a world wide web sob o ponto de vista da sua forma, considerando sua forma tanto a forma aparente, que é a interface, quanto sua forma oculta, dada pelos códigos que a conformam. A intenção é reunir referências tanto para designers que queiram ir mais além no domínio das linguagens de programação e marcação, quanto para programadores que queiram ter mais domínio sobre a linguagem do design gráfico. Para isso, desmembramos o trabalho em três partes. Uma primeira, trata da formação histórica da rede, com ênfase na transformação do papel do computador, de uma ferramenta de uso militar, para o suporte para um novo meio de comunicação de massa. Em seguida, partimos para uma análise mais objetiva da web sob o ponto de vista de sua forma aparente, e para isso tentamos primeiro compreender o design gráfico como linguagem, e como linguagem, quais são seu elementos constitutivos, além de questões novas que se colocam para o design de interfaces, como arquitetura de informação e usabilidade. Na terceira parte, elaboramos um manual técnico dos protocolos, linguagens e recursos utilizados para a construção de websites. Explicamos como utilizá-los e reunimos exemplos ilustrativos para auxiliar no aprendizado. Por fim, fazemos considerações sobre os agentes envolvidos na produção de websites designers e programadores , sobre a relação entre eles no processo de trabalho e introduzimos questões que se colocam no modo de construção da web de modo mais geral, a partir da relação com um novo tipo de usuário, que é também produtor. Com isso, produzimos um material que serve como introdução ao webdesign, abarcando conceitos e linguagens relacionadas ao processo, que serve como referência para aqueles que quiserem se envolverem com a disciplina. / This work studies the world wide web under the terms of its form, considering their form as the apparent form, which is the interface, and its hidden form, given by the codes that builds it. The intention is to gather as much reference for designers who want to go further in the field of programming languages and markup, and for developers who want to have more control over the language of graphic design. For this, we have unbundled the work in three parts. The first one deals with the historical formation of the network, with an emphasis on the transformation on the role of the computer, from a tool for military use into the support for a new medium of mass communication. Then we went to a more objective analysis of the web from the point of view of its apparent form, and we try to first understand the graphic design as a language and beeing language, what are its constituent elements, and also new issues that arise for the design of interfaces, such as information architecture and usability. In the third part, we prepared a technical manual of protocols, languages and resources used to build websites. We explain how to use them and gather illustrative examples to assist in learning. Finally, we make considerations for those involved in the production of websites - designers and developers -, on the relationship between them in the work process and introduce issues that stand more generally in the way of building the web, related to a new type of user, which is also producer. As a result, produce a material that serves as an introduction to web design, covering concepts and languages related to the process, which serves as reference for those wishing to become involved in discipline.

Orientador: Ivan Rizzo Guilherme / Coorientador: Daniel C. G. Pedronette / Banca: Fabrício Aparecido Breve / Banca: Jurandy Gomes de Almeida Junior / A extração de dados em páginas Web é um imp ortante problema que começou a ganhar força a partir da metade da década de 90. Um dos sub domínios dessa categoria de extração de dados p ossui como fo co os pro dutos em páginas de vendas online, dada a riqueza de informações disponibilizadas pelas lojas de e-commerce, ou comércio eletrônico, em seus portais de vendas. A extração dos dados dos produtos contidos nessas páginas, como nomes e preços, permite a criação de uma grande variedade de outras ferramentas que façam uso de tais dados com o objetivo de fornecer uma interpretação semântica a eles, como comparações entre preços praticados por diferentes lojas ou análises de hábitos de consumo. Diversas abordagens têm sido empregadas para se chegar à correta extração dos dados de interesse das páginas, fazendo uso de uma gama variada de técnicas para alcançarem seus objetivos, sendo que a técnica de Tree Matching apresenta grande destaque devido aos bons resultados. Este trabalho teve como objetivo implementar e avaliar o uso da técnica de Tree Matching para a extração de dados de produtos, especificamente o nome do produto, seu preço e, porventura, o preço promocional, em páginas de comércio eletrônico, a fim de determinar sua aplicabilidade a um sistema comercial. Foram propostas melhorias ao processo de extração com a finalidade de reduzir o tempo de resposta e aumentar a acurácia do algoritmo Generalized Simple Tree Matching. Resultados experimentais demonstraram uma precisão na extração dos dados de produtos na ordem de 93.6% sobre as páginas contidas na base Ecommerce DB e um ganho médio no tempo de resposta na ordem de 36% quando as páginas são reduzidas pelos métodos propostos neste trabalho / Web data extraction is an imp ortant issue which started b ecoming a strong line of study in the mid 90s. A sub domain of that category of study is the pro duct data extraction from online sales pages, given the wealth of information provided by stores through their websites. Data extraction of pro ducts contained in these kind of pages, like pro duct name and prices, enables the creation of a wide variety of other to ols that are able to use such data in order to provide a semantic interpretation to them, such as prices comparison among different stores and consumption habits analysis. Several approaches have b een applied to reach the target data extraction from Web pages. These approaches, in turn, use a wide range of techniques to reach their goals, and Tree Matching technique has great prominence due to its go o d results. This dissertation aimed to implement and evaluate the Tree Matching technique for the extraction of pro duct data, sp ecifically the pro duct name, its price and, p erhaps, the promotional price, on e-commerce pages, in order to determine its applicability to a commercial system. Improvements have b een prop osed to the extraction pro cess in order to reduce the resp onse time and increase the accuracy of the Generalized Simple Tree Matching algorithm. Experimental results demonstrated that the extraction process got an accuracy of about 93.6% on pages contained in Ecommerce Database and an average gain in response time of about 36% when the pages were reduced by the methods proposed in this study / Mestre

Algoritmos de detecção de linhas são usados em muitos campos de aplicação, tais como visão computacional e automação como base para análises mais complexas. Por exemplo, a informação de linha pode ser usada como dado de entrada para algoritmos de detecção de objetos ou mesmo para a estimativa da orientação espacial de robôs aéreos. Uma das formas de detectar linhas é através do uso de um processo de filtragem não linear chamado deWide Line Detector (WLD). Esse algoritmo é eficaz na marcação de pixels de linha em imagens em tons de cinza, separando linhas claras ou linhas escuras. Contudo, os algoritmos de detecção de linha não estão normalmente preocupados com a estimativa de largura local individual associada a um pixel. Se disponível, tal informação poderia ser explorada por algoritmos de visão computacional. Além do mais, a informação de cor também é extensivamente usada em visão computacional como um discriminante de objetos, mas o WLD não a usa. Neste Trabalho, nós propusemos a extensão do WLD para imagens em cores. Nós também desenvolvemos um novo kernel monotonicamente crescente que é mais eficiente e mais robusto para detectar linhas do que que os kernels monotonicamente decrescentes usados pelo WLD. Por fim, desenvolvemos uma maneira de obter uma estimativa de largura de linha partindo da densidade local associada a similaridade entre pixels, revertendo o processo usado pelo WLD para estimar qual kernel deve ser usado. Diversos experimentos foram realizados com o método proposto considerando diferentes parâmetros, além da comparação com o WLD tradicional, para analizar a eficácia do método. / Line detection algorithms are used by many application fields, such as computer vision and automation, as a basis for more complex analysis. For instance, line information can be used as input to object detection algorithms or even attitude estimation in flying robots. One way to detect lines is to use an isotropic nonlinear filtering procedure called the Wide Line Detector (WLD). This algorithm is effective to highlight the line pixels in gray scale images, separating dark or bright lines. However, line detection algorithms are not normally concerned with the pixel-wise estimation of thickness. If available, such information could be further explored by computer vision algorithms. Furthermore, color is extensively used in computer vision as an object discriminant, but not by the WLD. In this work, we propose the extension of the WLD to color images. We also develop a method that allows the estimation of the line width locally using only the density information and no border or center line information. Finally, we develop a new monotonically increasing kernel that is more efficient and yet effective to detect lines than the monotonically decreasing kernels used by the WLD. Finally, we devise a way ro obtain the wideline thickness from the density estimate obtained from the similarity between pixels, reverting the process used by the WLD to determine which kernel should be used. We perform several experiments with the proposed method, considering different parameters, and comparing it to the traditional WLD algorithm to assess the effectiveness of the method.

Submitted by DIEGO GABRIEL TORRES DINI null (diego.torres.dini@gmail.com) on 2017-02-25T21:08:29Z No. of bitstreams: 1 Diego Torres Dini Tese Doutoral.pdf: 1232376 bytes, checksum: dc45dfe7c23a8fd647db24acb963c71c (MD5) / Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2017-03-07T13:42:52Z (GMT) No. of bitstreams: 1 torresdini_dg_dr_ilha.pdf: 1232376 bytes, checksum: dc45dfe7c23a8fd647db24acb963c71c (MD5) / Made available in DSpace on 2017-03-07T13:42:52Z (GMT). No. of bitstreams: 1 torresdini_dg_dr_ilha.pdf: 1232376 bytes, checksum: dc45dfe7c23a8fd647db24acb963c71c (MD5) Previous issue date: 2017-02-03 / Outra / In Uruguay, reforestation with Eucalyptus sp. is of fundamental importance to produce paper, pulp and wood. The productivity of these continually grows due to application of breeding techniques, such as hybridization. This study aimed to investigate genetic parameters, productivity, stability, adaptability and to identify SNP markers associated with the diameter breast height (DBH) for to select Eucalypts grandis x Eucalyptus globulus full-sibs hybrid clones. The study was conducted in a clonal test, repeated at two different soils, in the state of Rio Negro, Uruguay. The population was phenotypically characterized to the DBH at 48 months of age and cambium tissues of each individual were sampled for genotyping with EuCHIP60K chip. The mean growth in DBH was similar between both places. The genotype-environment interaction was the simple type, with high genotype correlation in clones’ performance between environments (0.708), indicating the possibility of the same clones being selected for both places. Mean heritability between clones (0.724), coefficient of individual genetic variation (10.9%) and relative variation (0.916), showed the possibility of obtaining gains by selecting clones with higher growth, which was estimated in 3.1% for both sites together. A total of 15,196 markers SNPs were used in the genomic selection for the DBH, but after cleaning of SNPs data, the number was reduced for 15,196 (23.5%). The predictive capacity was expected to be low or negative (-0.15) for this population given the population size (78 individuals). We used the model rrBLUP with a validation of Jackknife. The model do not showed precision to predict the DBH. These results were consistent with theoretical expectations, which indicate that it is necessary to have an improvement population of at least 1,000 phenotyped and genotyped individuals. The DBH is the most important trait in the breeding of the genus Eucalyptus. However its quantitative nature added to the time necessary for this phenotype to develop makes the early detection of this trait are difficult. The identification of molecular markers associated with quantitative phenotypes is a good choice for the identification of QTLs that will help the early detection of individuals with high DBH. Significant markers associated to DBH , were indentificated into the chromosome 6, suggesting the presence of a QTL in this chromosome. Since they are clones originated from vegetative propagation and a full-sibs single-progeny, they should preferably be used for reforestation based on their cloning, since mating between clones can generate endogamy by biparental inbreeding. The utilization of SNPs helped to confirm the degree of parentage between the clones as well as clonal identity control.

Abstract not available

<p>The aim of this master's thesis is to present an introduction to semiological analysis of web based material, which is a hypothesis that combines the theoretical framework of classical Saussurean semiology, visual social semiotics as was developed by Günther Kress and Theo van Leeuwen, and Roland Barthes's notion of 'Myths'. Furthermore, a new tool called 'pseudo-signifier', constructed solely for the thesis, is also used in conjunction with the semiological analysis. The hypothesis is tested in a case study involving the web portal of a Swedish commune, Gothenburg (goteborg.se). A complete semiological analysis is performed on the case. The case study revealed numerous findings of interest, among others that images and texts on the web portal were sometimes used in a contradicting manner, and often in a way that symbollically excluded citizens from the portal, a fact which could be uncovered when studying underlying myths that permeated the web portal. The pseudo-signifiers combined with the notion of the Barthean myth proved to be an important tool in order to analyze images and texts on web material, to show how images and texts are to be seen together, not one by one by themselves. An attempt was also made to make the pseudo-signifiers a mean to provide assistance to the creators of the web portal, in order to make the portal more user- and information friendly.</p>

The aim of this master's thesis is to present an introduction to semiological analysis of web based material, which is a hypothesis that combines the theoretical framework of classical Saussurean semiology, visual social semiotics as was developed by Günther Kress and Theo van Leeuwen, and Roland Barthes's notion of 'Myths'. Furthermore, a new tool called 'pseudo-signifier', constructed solely for the thesis, is also used in conjunction with the semiological analysis. The hypothesis is tested in a case study involving the web portal of a Swedish commune, Gothenburg (goteborg.se). A complete semiological analysis is performed on the case. The case study revealed numerous findings of interest, among others that images and texts on the web portal were sometimes used in a contradicting manner, and often in a way that symbollically excluded citizens from the portal, a fact which could be uncovered when studying underlying myths that permeated the web portal. The pseudo-signifiers combined with the notion of the Barthean myth proved to be an important tool in order to analyze images and texts on web material, to show how images and texts are to be seen together, not one by one by themselves. An attempt was also made to make the pseudo-signifiers a mean to provide assistance to the creators of the web portal, in order to make the portal more user- and information friendly.