Dissertations / Theses on the topic 'PTaaS'

The given work is dedicated to the introduction to penetration testing methodologies. One of the most reliable ways of maintaining information security is regular conducting of penetration testing. The main objective of penetration testing is to identify security weaknesses by simulation of real attacks. The methodology of pentest research as a service offered to clients of cloud services and local computers is considered. One of the possible architectures is offered

Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Economics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

Bibliography: pages 155-164.
This research study attempted to gather, present and analyse information regarding the current role of the Parent-Teacher-Student-Associations in the democratic governance of secondary schools for purposes of contributing towards the education governance policy discourse as South Africa moves away from apartheid to democracy. Central to this largely fact-finding exercise was an attempt to make a contribution to an understanding of how the Parent-Teacher-Student-Associations, in the execution of their duties, practice both democracy and accountability; operate; resolve tensions and/or differences among parents, teachers and students; impact upon the schools in general; and relate to both the Department of Education and Training and other organs of civil society. Further, this survey attempted to ascertain m which crucial areas the Parent-Teacher-Student-Associations are most lacking, and how these could be strengthened. And finally, an attempt was made in this study to contribute to the possible future role of the Parent-Teacher-Student Associations in the new democratic education dispensation, and how, in the execution of this new role the Parent-Teacher-Student-Associations should relate to the new, future democratic government. The study concluded with a number of recommendations for policy in the area of democratic school governance. The study used largely a survey method. The Parent-Teacher-Student-Associations of three secondary schools under the auspices of the Department of Education and Training in the Western Cape region were surveyed. The single most important data-gathering instrument used was the interview. Numerous conclusions were arrived at. First, the Parent-Teacher-Student-Associations studied were found to be very powerful and effective in their areas of operation in school governance despite their inability to have access to resources of power, wealth and expertise. These Parent-Teacher-Student-Associations are important education policy actors who are not only influencing policy, but are in total control of very crucial policy areas in their schools. Second, the study concluded that whereas the Parent-Teacher-Student-Associations studied represent an important step towards the full democratisation of education in general, and in their schools in particular, their role in school governance could not be described as an unqualified success. However, despite the problems associated with the PTSAs involvement in school governance, their role does have the potential to make for better schools. And finally, because of the limited nature of the study in terms of the methodology, scope and time, the conclusions arrived at here cannot and should not be generalised beyond the confines of the study as no attempt was made to embark upon regional or national research exercise.

Memoria para optar al título de Ingeniera Civil Química
El crecimiento de la población mundial y aumento del desarrollo económico de los países ha generado una mayor producción de residuos, los que se asocian directamente a la actividad humana. En Chile, la mayor parte de estos es dispuesta en rellenos sanitarios y vertederos, emitiendo GEI directamente a la atmósfera, y generando lixiviados que pueden contaminar las aguas y provocar pérdida de nutrientes en los suelos. Bajo este contexto, el presente trabajo estudia la coincineración de residuos mediante el proceso Thermylis® como una alternativa a la disposición actual de lodos provenientes de PTAS, tomando como caso base los generados en distintas regiones del país. Se evalúa este proceso a través de una comparación técnica, económica y ambiental de distintas opciones de alimentación, consistentes en una mezcla de lodos con otros residuos sólidos seleccionados con el fin de aumentar el poder calorífico. Considerando la población residente, el número de sitios de disposición final, y la generación y destino de los residuos, se definen tres casos de estudio: Gran Santiago Región Metropolitana (caso 1), Rancagua y alrededores Región de O Higgins (caso 2), y Gran Concepción y alrededores Región del Biobío (caso 3). Se consideran los lodos generados en las principales PTAS de cada región, con lo que los flujos de alimentación para cada caso son 1.158[t/día], 105[t/día] y 249[t/día], respectivamente. A partir de la evaluación técnica, en los tres casos se seleccionan alimentaciones compuestas por lodos y plásticos, debido a que son las más favorables desde el punto de vista energético. Además, se determina que en todos ellos se cumple con la normativa ambiental vigente para este tipo de procesos (D29, MMA). Por otra parte, se realiza una evaluación económica a partir de un flujo de caja puro a 15 años, con lo que se obtiene un VAN de -195 [MUSD] para el caso 1, -45 [MUSD] para el caso 2 y -73 [MUSD] para el caso 3. Con esto, se concluye que el proyecto no es rentable desde el punto de vista económico en los escenarios planteados, debido a la alta inversión requerida por Thermylis® y el bajo costo por disponer residuos en Chile.

A América do Sul, na história recente, foi palco de diversas ações de integração regional relacionadas ao comércio, influenciando os posicionamentos dos países em matéria de políticas de comércio interncional bem como formando um emaranhado de relações que se sobrepõe muitas vezes de formas antagônicas. Neste contexto, a presente dissertação aborda o histórico das principais blocos regionais que envolvem a América do Sul como base para mostrar a atual fragmentação deste subcontinente em três visões principais de política de comércio internacional, sendo uma visão intermediária caracterizada pelo Brasil e acompanhada pelos membros do MERCOSUL em uma vertente regional-multilateralista. Em um extremo estão Venezuela, Equador e Bolívia, representantes da ALBA, com seus governos de posicionamento extremo-nacionalista. E em posição antagônica a estes estão Chile, Peru e Colômbia, que conformam o eixo liberal-bilateralista. Objetivando comprovar que há uma tendência de fortalecimento da visão liberal-bilateralista na região será feito um estudo com base nas suas principais formas de atuação, ou seja, por meio da análise de Acordos Preferenciais de Comércio, mais especificamente FTAs bilaterais celebrados com países de distintas regiões com foco especial ao período imediatamente após a eclosão da crise de 2008, de 2009-2014. Finalmente, se a hipótese se confirmar, restando evidenciada a retomada do posicionamento bilateralista, após período de predominância da visão multilateralista na América do Sul, é importante apontar os desafios para o Brasil neste cenário.
South America, in recent history, has had several regional integration actions related to trade, influencing the countries positions in terms of international trade policies as well as forming a tangle of relationships that often overlaps with contrary views. In this context, this thesis addresses the history of the main regional blocs involving South America as a basis to show the current fragmentation of this subcontinent in three main views of international trade policy, with an intermediate vision characterized by Brazil and followed also by members of the MERCOSUR in a regional-multilateralist position. At one extreme, the countries Venezuela, Ecuador and Bolivia, ALBA representatives, present their extreme-nationalist position. And in an antagonistic position, Chile, Peru and Colombia constitute the liberal-bilateralist axis. In order to prove that there is a trend towards the strengthening of the liberal-bilateralist vision in the region, a research based on analysis of Preferential Trade Agreements will be held, focusing bilateral FTAs concluded with different countries regions with special attention to the period immediately after the outbreak of the 2008 crisis, from 2009 to 2014. Finally, if the hypothesis is confirmed, demonstrating the resumption of the bilateralist position after a period in which the multilateralist vision was predominant in South America, it is important to point the challenges of this scenario for Brazil.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A citricultura é uma atividade agro-industrial de suma importância para o Estado de São Paulo e para o Brasil. Com uma área plantada em torno de aproximadamente 1 milhão de hectares o país mantém a posição de maior produtor mundial de citros. Desse total, 77% encontram-se localizados na região Sudeste. O sistema citrícola representa 4,47% das exportações de produtos do agronegócio nacional, sendo que o suco de laranja concentrado representa 72% do valor dessas exportações. Entretanto, todo este potencial econômico vem sendo prejudicado por várias doenças dentre elas uma denominada Cancro Cítrico, a qual é causada por um fitopatógeno bacteriano denominado Xanthomonas citri subsp. citri (Xcc). Com o objetivo de analisar os feitos da interação entre essa bactéria e seu hospedeiro natural, utilizou-se a técnica de Análise da Transcrição Reversa em Tempo Real (qRT-PCR) para quantificar a expressão dos genes que compõem o SSTT, SSTQ, algumas ORFs hipotéticas e as quatro cópias do gene pthA. Para tanto, realizou-se um estudo prévio com 10 genes candidatos visando identificar os mais adequados para serem usados como genes de referência no processo de normalização de dados em experimentos dessa natureza. O experimento contou com quatro replicatas biológicas e duas replicatas técnicas. Com base nos resultados, verificou-se que os genes rpoB e rpoC parecem ser os mais indicados para a normalização de dados em experimentos de expressão gênica por qRT-PCR que envolvam analises intergrupos. A maioria dos genes que compõem o SSTT se mostraram induzidos quando a bactéria esteve em contato com seu hospedeiro, com destaque para os genes hrpXct e hrpB4, o que sugere que este sistema tenha um importante papel na patogenicidade dessa bactéria. Por outro lado, os resultados e o estudo da expressão gênica evidenciaram que...
The citrus is an agro-industrial activity of great importance for the State of São Paulo and Brazil. With a planted area around 1 million hectares the country maintains its position of world's leading producer of citrus. Of these, 77% are located in the Southeast. The citrus system represents 4.47% of national agribusiness exportation, being the orange juice concentrate responsible for 72% of the value of these exports. However, all this economic potential is being hampered by diseases among them one called citrus canker, which is caused by a phytopathogenic bacterium known as Xanthomonas citri subsp. citri (Xcc). With the aim of analyzing the achievements of the interaction between this bacterium and its natural host, we used the technique of Real- Time Reverse Transcription Analysis (qRT-PCR) to quantify the expression of genes that comprise the SSTT, SSTQ, some hypothetical ORFs and the four copies of the gene pthA. Thus, a preliminary study with 10 candidate genes were conducted to identify the most suitable ones for use as reference in the process of data standardization in such experiments. The experiment had four biological replicates and two technical replicates. Based on the results, it was found that the rpoB and rpoC genes seem to be the most suitable for the standardization of data in experiments of gene expression by qRT-PCR analysis involving intergroup. Most of the genes that comprise the SSTT was induced when the bacterium was in contact with its host, with emphasis on the genes... (Complete abstract, click electronic access below)

Resumo: A citricultura é uma atividade agro-industrial de suma importância para o Estado de São Paulo e para o Brasil. Com uma área plantada em torno de aproximadamente 1 milhão de hectares o país mantém a posição de maior produtor mundial de citros. Desse total, 77% encontram-se localizados na região Sudeste. O sistema citrícola representa 4,47% das exportações de produtos do agronegócio nacional, sendo que o suco de laranja concentrado representa 72% do valor dessas exportações. Entretanto, todo este potencial econômico vem sendo prejudicado por várias doenças dentre elas uma denominada Cancro Cítrico, a qual é causada por um fitopatógeno bacteriano denominado Xanthomonas citri subsp. citri (Xcc). Com o objetivo de analisar os feitos da interação entre essa bactéria e seu hospedeiro natural, utilizou-se a técnica de Análise da Transcrição Reversa em Tempo Real (qRT-PCR) para quantificar a expressão dos genes que compõem o SSTT, SSTQ, algumas ORFs hipotéticas e as quatro cópias do gene pthA. Para tanto, realizou-se um estudo prévio com 10 genes candidatos visando identificar os mais adequados para serem usados como genes de referência no processo de normalização de dados em experimentos dessa natureza. O experimento contou com quatro replicatas biológicas e duas replicatas técnicas. Com base nos resultados, verificou-se que os genes rpoB e rpoC parecem ser os mais indicados para a normalização de dados em experimentos de expressão gênica por qRT-PCR que envolvam analises intergrupos. A maioria dos genes que compõem o SSTT se mostraram induzidos quando a bactéria esteve em contato com seu hospedeiro, com destaque para os genes hrpXct e hrpB4, o que sugere que este sistema tenha um importante papel na patogenicidade dessa bactéria. Por outro lado, os resultados e o estudo da expressão gênica evidenciaram que... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The citrus is an agro-industrial activity of great importance for the State of São Paulo and Brazil. With a planted area around 1 million hectares the country maintains its position of world's leading producer of citrus. Of these, 77% are located in the Southeast. The citrus system represents 4.47% of national agribusiness exportation, being the orange juice concentrate responsible for 72% of the value of these exports. However, all this economic potential is being hampered by diseases among them one called citrus canker, which is caused by a phytopathogenic bacterium known as Xanthomonas citri subsp. citri (Xcc). With the aim of analyzing the achievements of the interaction between this bacterium and its natural host, we used the technique of Real- Time Reverse Transcription Analysis (qRT-PCR) to quantify the expression of genes that comprise the SSTT, SSTQ, some hypothetical ORFs and the four copies of the gene pthA. Thus, a preliminary study with 10 candidate genes were conducted to identify the most suitable ones for use as reference in the process of data standardization in such experiments. The experiment had four biological replicates and two technical replicates. Based on the results, it was found that the rpoB and rpoC genes seem to be the most suitable for the standardization of data in experiments of gene expression by qRT-PCR analysis involving intergroup. Most of the genes that comprise the SSTT was induced when the bacterium was in contact with its host, with emphasis on the genes... (Complete abstract, click electronic access below)
Orientador: Maria Inês Tiraboschi Ferro
Coorientador: Marcelo Luiz de Laia
Banca: Leandro Marcio Moreira
Banca: Luiz Roberto Furlan
Mestre

Piercing problems arise often in facility location, which is a well-studied area of computational geometry. The general form of the piercing problem discussed in this dissertation asks for the minimum number of facilities for a set of given rectangular demand regions such that each region has at least one facility located within it. It has been shown that even if all regions are uniform sized squares, the problem is NP-hard. Therefore we concentrate on approximation algorithms for the problem. As the known approximation ratio for arbitrarily sized rectangles is poor, we restrict our effort to designing approximation algorithms for unit-height rectangles. Our e-approximation scheme requires n^O(1/ε²) time. We also consider the problem with restrictions like bounding the depth of a point and the width of the rectangles. The approximation schemes for these two cases take n^O(1/ε) time. We also show how to maintain a factor 2 approximation of the piercing set in O(log n) amortized time in an insertion-only scenario.

Phosphorescent metal complexes can be incorporated into amyloid-like fibrils, and these fibrils can be decorated with conjugated polyelectrolytes (CPEs). In this study, fac-tris[2-phenylpyridinato-C²,N]irdium(III) complexes [Ir(piq)₃] were used as the phosphorescence emitter and Sodium-poly(3-thiophene acetic acid) (PTAA-Na) compounds were used as CPEs. Herein we study the energy transfer processes between the iridium complexes and the CPEs. To investigate these mechanisms, the analysis of the emission quenching and time-resolved measurements were done. Our measurements show that energy can be transfered from singlet state of PTAA to the singlet state of Ir(piq)₃. Moreover, incorporation of iridium into amyloid fibrils decreases the importance of energy transfer by the Dexter mechanism. Finally we propose a geometry of interaction to explain the obtained results.

Im Rahmen der vorliegenden Arbeit wurden Schottky-Dioden mittels Rolle-zu-Rolle-Verfahren hergestellt und charakterisiert. Die Dioden bestanden dabei aus einer Kathode (Aluminium oder Kupfer), die durch Sputtern aufgebracht wurde, einer Halbleiterschicht aus Polytriphenylaminen (PTPA3), die mittels Tiefdruck aufgebracht wurde und einer im Flexodruck hergestellten Anode (PEDOT:PSS, Pani oder Carbon Black). Aus elektrischer Sicht wiesen dabei Dioden mit Kupfer und Carbon Black die besten Eigenschaften auf. Mit Hilfe dieser Elektrodenmaterialien und bei Halbleiterschichtdicken von ca. 200 nm konnten Grenzfrequenzen der Dioden von über 1 MHz realisiert werden. Weiterhin wiesen diese Dioden eine gute Langzeitstabilität sowie eine gute Stabilität gegenüber UV-Licht, Feuchtigkeit und Temperatur auf
Aim of this work was to demonstrate that Schottky-Diodes can be fabricated by means of Roll-to-Roll-Methods and to characterize these diodes. The diodes consists of a sputtered cathode (Aluminum or Copper), a gravure printed semiconducting layer of Polytriphenylamine (PTPA3) and a flexo printed anode (PEDOT:PSS, Pani, Carbon Black). Best electrical characteristics were obtained with diodes consisting Copper and Carbon Black as electrodes. With a thickness of the semiconducting layer of ~200 nm diodes with a cut-off frequency above 1 MHz could be demonstrated. These diodes showed also a good stability when exposed to UV-light, moisture and temperature

Esta tese tem por objetivo o desenvolvimento de metodologias eficientes e de baixo custo para ajustar as propriedades elétricas de OFETs de canal p e de canal n, a fim de possibilitar a fabricação do circuito complementar orgânico, semelhante a uma estrutura CMOS. O desempenho do circuito complementar fabricado foi otimizado, e também foi confeccionado por impressão um OFETs de canal operando em baixas tensões. Para a fabricação do CMOS orgânico foi proposto um método baseado na seleção adequada do solvente da camada dielétrica para ajustar o desempenho elétrico dos OFETs de canal p e de canal n. Os solventes, MEK, nBA e DMSO foram selecionados para a dissolução do PMMA por apresentarem diferenças nos valores de momento de dipolo, de ponto de ebulição e de graus de ortogonalidade em relação as camadas semicondutoras de P3HT e de P(NDI2OD-T2) dos OFETs. A análise dos resultados dos OFETs de canal p e de canal n demonstrou que a metodologia proposta é adequada tanto para o ajuste das propriedades elétricas destes dispositivos quanto para a otimização do desempenho dos mesmos. Os melhores desempenhos elétricos para os OFETs de canal p e de canal n foram obtidos quando utilizados o DMSO e o MEK como solventes do PMMA, respectivamente, devido à perfeita ortogonalidade destes solventes em relação às camadas semicondutoras. Os OFETs de canal p que utilizaram o DMSO e os OFETs de canal n que utilizaram o nBA foram os que apresentaram desempenhos elétricos semelhantes, sendo portanto aplicados na fabricação do CMOS. Valores de ganho entre 6,8 e 7,8 e de margem de ruído entre 28,3 V e 34,5 V foram obtidos para inversores complementares fabricados nesta etapa do trabalho. OFETs de canal p utilizando uma blenda de PTAA: diF TES ADT como camada semicondutora, o PEDOT:PSS como eletrodos dreno/fonte e o P(VDF-TrFE-CFE) como camada dielétrica também foram fabricados neste trabalho. A técnica de blade-coating foi utilizada para a deposição dos eletrodos dreno/fonte e da camada semicondutora, ao passo que a técnica de spray-coating foi utilizada para a deposição da camada dielétrica. Da análise dos resultados foi possível inferir que a utilização de um dielétrico com elevada constante dielétrica (K), como o P(VDF-TrFE-CFE), possibilita o funcionamento dos transistores a baixas tensões (≤ 8 V), porém com valores de mobilidade reduzidos devido à elevada desordem dipolar na interface provocada por este dielétrico. Para minimizar esses efeitos, uma fina camada de um polímero fluorado foi depositada entre a camada semicondutora e a dielétrica pela técnica de blade-coating, constituindo assim uma bicamada dielétrica nos OFETs. Dos resultados das medidas elétricas dos OFETs constituídos pela bicamada dielétrica foi observada permanência do funcionamento destes dispositivos a tensões inferiores a 8 V com desempenho elétricos superiores a resultados já publicados na literatura. Por fim, inversores lógicos unipolares com transistores de carga foram fabricados com os OFETs que utilizaram a bicamada dielétrica, sendo obtidos valores de ganho entre 1,2 e 1,6 e de margem de ruído entre 56% e 68,5% de ½ VDD.
This thesis aimed to develop an efficient and low cost method to adjust the electrical properties of p- and n-channel OFETs to allow us to build an organic CMOS and the optimization of printed p-channel OFETs to work at low voltages. We proposed a method to fabricate the organic CMOS, based on the careful selection of dielectric solvent, which was adjusted to obtain the best performance of p- and n-channel OFETs. The dielectric solvents as MEK, nBA and DMSO were selected to dissolve the PMMA dielectric polymer due their different physical properties as dipole moment and boiling point and because they showed slightly different degrees of orthogonality to the P3HT and P(NDI2OD-T2) semiconductor layers of the OFETs. The results showed that the careful selection of the dielectric solvent not only allows to tune the electrical characteristics of the p- and n-channel OFETs, but also to improve the performance of these devices. The best performances were achieved when DMSO and MEK were used as dielectric solvents of the p and n-channel OFETs, respectively, as result of the perfectly orthogonality of these solvents to the semiconductor layers. P-channel OFETs using DMSO and n-channel OFETs using nBA showed similar electrical characteristics and thus, they were used to construct the organic CMOS. The organic complementary inverters showed high gain and noise margin values in the range of 6,8 to 7,8 and 28,3 V to 34,5 V, respectively. Printed p-channel OFETs were also fabricated, in which the blend PTAA:diF TES ADT was used as semiconductor channel, PEDOT:PSS as the drain/source electrodes and P(VDF-TrFE-CFE) as the dielectric layer. The blade-coating technique was used to deposit the source/drain electrodes and the semiconductor layer, while the spray-coating technique was used to deposit the dielectric layer. It was observed that using high-k dielectric as P(VDF-TrFE-CFE) enable to reduce the operating voltage of the OFETs (≤8 V), however, this high-k dielectric also reduced the field effect mobility due the dipolar disorder at the semiconductor/dielectric interface. To minimize the dipolar issue at the interface, we inserted a thin fluoropolymer dielectric layer by blade-coating between the semiconductor and the high-k dielectric layers, thus constituting a dielectric bilayer on the OFETs. From the electrical measurements of the OFETs with the dielectric bilayer, it was observed that the devices were still working at 8 V and they also showed better performance in comparison to results already published. Finally, organic unipolar inverters with load transistors were fabricated using the p-channel OFETs with the dielectric bilayer and they showed reasonable performance, with gain and noise margin in the range of 1,2 to 1,6 and 56% e 68,5% of ½ VDD, respectively.

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This research aimed at investigating, through the education professionals point of view, how parents/guardian are participating at school, what professionals expect from this participation and which factors could damage or help its promotion. Two auxiliary canals at Public State Schools: Parent and Teacher Associations (PTAs) and School Councils were approached as they are in force and guaranteed by law. Fourteen subjects (directors, teachers and employees), from seven Elementary Schools - Cicle I, in Franca-SP, took part in the research. A questionnaire and an interview were used to collect data. Results showed that school professionals recognize the importance of parents/guardian at school, but they also recognize the difficulty to promote it. The study revealed that Parent and Teacher Associations (PTAs) and School Councils could not be firmed yet as effective auxiliary canals for the Education Institutions. On the contrary, the participants consider these canals as formal, bureaucratic spaces: the first, giving priority to the finance dimension, without any connection with the pedagogic dimension; the latter, it is showed through reports, have little performance in the everyday school life. About both Parent and Teacher Association (PTAs) and School Councils it was detected a lack of clearness on the part of the school professionals as for the aims, rights and owes that these canals point, discrediting, thus, the power of decision and participation on them, in the sight of improving education. On the other hand, it was observed a change, at least in the discourse, going towards the recognition that the school is not self-sufficient to take decisions and it needs the parents/guardian to achieve the goal of a school with better quality
O trabalho que aqui se apresenta teve como objetivo investigar, na visão dos profissionais da educação, como está acontecendo a participação dos pais/responsáveis na escola, que expectativas têm os profissionais sobre tal participação e quais os fatores que prejudicariam ou auxiliariam sua promoção. Foram focalizados dois canais auxiliares existentes no Sistema de Ensino Público do Estado de São Paulo: as Associações de Pais e Mestres (APMs) e os Conselhos de Escola, ambos em vigor nos dias atuais e garantidos por lei. Participaram do presente trabalho 14 sujeitos (entre diretores, professores e funcionários) pertencentes a sete escolas de Ciclo I do Ensino Fundamental do município de Franca SP. Para a coleta dos dados foram utilizados o questionário e a entrevista. Os resultados indicaram que os profissionais da escola reconhecem a importância da participação dos pais/responsáveis na instituição escolar, mas reconhecem, também, a dificuldade em promovê-la. Revelou-se que a APM e o Conselho de Escola ainda não conseguiram se firmar como canais auxiliares efetivos para a instituição escolar. Pelo contrário, os participantes percebem tais canais como espaços formais, burocráticos: o primeiro priorizando a dimensão financeira, sem que esta apresente ligação com a dimensão pedagógica; quanto ao segundo, evidencia-se, a partir dos depoimentos, a pouca atuação do mesmo no cotidiano escolar. Em relação aos dois APM e Conselho de Escola detecta-se a falta de clareza por parte dos profissionais da escola quanto às finalidades, direitos e deveres que esses canais apontam, desprestigiando o poder de decisão e participação nos mesmos com vistas à melhoria educacional. Em contrapartida, observa-se uma mudança, pelo menos no discurso, em direção ao reconhecimento de que a escola não é auto-suficiente para tomar as decisões e necessita dos pais/responsáveis para concretizar a meta de uma escola com maior qualidade

In this work we formalize a new natural objective (or cost) function for bi-clustering - Monochromatic bi-clustering. Our objective function is suitable for detecting meaningful homogenous clusters based on categorical valued input matrices. Such problems have arisen recently in systems biology where researchers have inferred functional classifications of biological agents based on their pairwise interactions. We analyze the computational complexity of the resulting optimization problems. We show that finding optimal solutions is NP-hard and complement this result by introducing a polynomial time approximation algorithm for this bi-clustering task. This is the first positive approximation guarantee for bi-clustering algorithms. We also show that bi-clustering with our objective function can be viewed as a generalization of correlation clustering.

Geometric covering is a well-studied topic in computational geometry. We study three covering problems: Disjoint Unit-Disk Cover, Depth-(≤ K) Packing and Red-Blue Unit-Square Cover. In the Disjoint Unit-Disk Cover problem, we are given a point set and want to cover the maximum number of points using disjoint unit disks. We prove that the problem is NP-complete and give a polynomial-time approximation scheme (PTAS) for it. In Depth-(≤ K) Packing for Arbitrary-Size Disks/Squares, we are given a set of arbitrary-size disks/squares, and want to find a subset with depth at most K and maximizing the total area. We prove a depth reduction theorem and present a PTAS. In Red-Blue Unit-Square Cover, we are given a red point set, a blue point set and a set of unit squares, and want to find a subset of unit squares to cover all the blue points and the minimum number of red points. We prove that the problem is NP-hard, and give a PTAS for it. A "mod-one" trick we introduce can be applied to several other covering problems on unit squares.

This thesis has two parts. In the first part, we study some graph covering problems with a non-local covering rule that allows a "remote" node to be covered by repeatedly applying the covering rule. In the second part, we provide some results on the packing of Steiner trees. In the Propagation problem we are given a graph $G$ and the goal is to find a minimum-sized set of nodes $S$ that covers all of the nodes, where a node $v$ is covered if (1) $v$ is in $S$, or (2) $v$ has a neighbor $u$ such that $u$ and all of its neighbors except $v$ are covered. Rule (2) is called the propagation rule, and it is applied iteratively. Throughout, we use $n$ to denote the number of nodes in the input graph. We prove that the path-width parameter is a lower bound for the optimal value. We show that the Propagation problem is NP-hard in planar weighted graphs. We prove that it is NP-hard to approximate the optimal value to within a factor of $2^{\log^{1-\epsilon}{n}}$ in weighted (general) graphs. The second problem that we study is the Power Dominating Set problem. This problem has two covering rules. The first rule is the same as the domination rule as in the Dominating Set problem, and the second rule is the same propagation rule as in the Propagation problem. We show that it is hard to approximate the optimal value to within a factor of $2^{\log^{1-\epsilon}{n}}$ in general graphs. We design and analyze an approximation algorithm with a performance guarantee of $O(\sqrt{n})$ on planar graphs. We formulate a common generalization of the above two problems called the General Propagation problem. We reformulate this general problem as an orientation problem, and based on this reformulation we design a dynamic programming algorithm. The algorithm runs in linear time when the graph has tree-width $O(1)$. Motivated by applications, we introduce a restricted version of the problem that we call the $\ell$-round General Propagation problem. We give a PTAS for the $\ell$-round General Propagation problem on planar graphs, for small values of $\ell$. Our dynamic programming algorithms and the PTAS can be extended to other problems in networks with similar propagation rules. As an example we discuss the extension of our results to the Target Set Selection problem in the threshold model of the diffusion processes. In the second part of the thesis, we focus on the Steiner Tree Packing problem. In this problem, we are given a graph $G$ and a subset of terminal nodes $R\subseteq V(G)$. The goal in this problem is to find a maximum cardinality set of disjoint trees that each spans $R$, that is, each of the trees should contain all terminal nodes. In the edge-disjoint version of this problem, the trees have to be edge disjoint. In the element-disjoint version, the trees have to be node disjoint on non-terminal nodes and edge-disjoint on edges adjacent to terminals. We show that both problems are NP-hard when there are only $3$ terminals. Our main focus is on planar instances of these problems. We show that the edge-disjoint version of the problem is NP-hard even in planar graphs with $3$ terminals on the same face of the embedding. Next, we design an algorithm that achieves an approximation guarantee of $\frac{1}{2}-\frac{1}{k}$, given a planar graph that is $k$ element-connected on the terminals; in fact, given such a graph the algorithm returns $k/2-1$ element-disjoint Steiner trees. Using this algorithm we get an approximation algorithm with guarantee of (almost) $4$ for the edge-disjoint version of the problem in planar graphs. We also show that the natural LP relaxation of the edge-disjoint Steiner Tree Packing problem has an integrality ratio of $2-\epsilon$ in planar graphs.

Im Rahmen der vorliegenden Arbeit wurden Schottky-Dioden mittels Rolle-zu-Rolle-Verfahren hergestellt und charakterisiert. Die Dioden bestanden dabei aus einer Kathode (Aluminium oder Kupfer), die durch Sputtern aufgebracht wurde, einer Halbleiterschicht aus Polytriphenylaminen (PTPA3), die mittels Tiefdruck aufgebracht wurde und einer im Flexodruck hergestellten Anode (PEDOT:PSS, Pani oder Carbon Black). Aus elektrischer Sicht wiesen dabei Dioden mit Kupfer und Carbon Black die besten Eigenschaften auf. Mit Hilfe dieser Elektrodenmaterialien und bei Halbleiterschichtdicken von ca. 200 nm konnten Grenzfrequenzen der Dioden von über 1 MHz realisiert werden. Weiterhin wiesen diese Dioden eine gute Langzeitstabilität sowie eine gute Stabilität gegenüber UV-Licht, Feuchtigkeit und Temperatur auf.:Inhaltsverzeichnis 1 Einleitung 2 Metall-Halbleiter-Kontakt 2.1 Idealer Metall-Halbleiter-Kontakt 2.2 Metall-Halbleiter-Kontakt unter Spannung 2.3 Realer Metall-Halbleiter-Kontakt 2.3.1 Metall-Halbleiter-Kontakte ohne Grenzflächenzustände innerhalb der Bandlücke 2.3.2 Metall-Halbleiter-Kontakt mit Grenzflächenzuständen 2.4 Grenzflächen zwischen Metallen und organischen Materialien 2.5 Transportmechanismen / -modelle 2.5.1 Ladungstransport in organischen Halbleitern 2.5.2 Thermionische Emission 2.5.3 Fowler-Nordheim-Tunneln 2.5.4 Raumladungsbegrenzte Ströme 2.6 Poole-Frenkel Effekt 3 Stabilität organischer Materialien 3.1 Einfluss von Sauerstoff 3.2 Einfluss von Wasser 3.3 Einfluss von chemischen Reaktionen 3.4 Einfluss von elektrischem Stress 3.5 Einfluss von Licht 3.6 Einfluss von Struktur- und Morphologieänderungen 3.7 Einfluss von kombinierten Effekten 3.8 Einfluss von Barriereschichten 4 Schottky-Dioden 4.1 Allgemeiner Aufbau 4.2 Stand der Technik 4.3 Anforderungen an Materialien für Schottky-Dioden 4.3.1 Kathode 4.3.2 Halbleiter 4.3.3 Anode 4.4 Gleichrichter 4.5 Logische Schaltungen mit Dioden 5 Rolle-zu-Rolle-Verfahren / Druckverfahren 5.1 Übersicht Druckverfahren / Beschichtungsverfahren 5.2 Bewertung der Verfahren für die Herstellung von Schottky-Dioden 6 Versuchsdurchführung 6.1 Druckversuche 6.1.1 Genutzte Druckmaschinen 6.1.2 Verwendete Materialien 6.2 Messverfahren 6.2.1 Morphologische Charakterisierung 6.2.2 Elektrische Charakterisierung 6.2.3 Strom-Spannungs-Charakterisitik 6.2.4 Kapazitätscharakteristik 6.2.5 Elektrische Eigenschaften der Anodenmaterialien 7 Ergebnisse der Druckversuche 7.1 Einfluss der Lösungsmittel 7.2 Einfluss der Druckgeschwindigkeit 7.3 Druck der Anode 8 Elektrische Charakterisierung der Dioden 8.1 Vergleich der Elektrodenmaterialien 8.2 Strom-Spannungs-Kennlinie in Sperrrichtung 8.3 Gleichmäßigkeit der Strom-Spannungs-Charakteristik 8.4 Einfluss des Lösungsmittelgemischs 8.5 Einfluss der Trocknungstemperatur 8.6 Kapazitätscharakteristika 9 Stabilität 9.1 Langzeitstabilität 9.2 Hysterese 9.3 Einfluss der Temperatur 9.4 Einfluss von Feuchtigkeit 9.5 Einfluss von Licht 9.6 Einfluss von elektrischem Stress 10 Anwendungen 10.1 Gleichrichter 10.2 Logische Schaltungen mit Dioden 11 Zusammenfassung Literaturverzeichnis Abbildungsverzeichnis Tabellenverzeichnis Formel- und Symbolverzeichnis Abkürzungsverzeichnis Danksagung Lebenslauf Veröffentlichungen Eigenständigkeitserklärung
Aim of this work was to demonstrate that Schottky-Diodes can be fabricated by means of Roll-to-Roll-Methods and to characterize these diodes. The diodes consists of a sputtered cathode (Aluminum or Copper), a gravure printed semiconducting layer of Polytriphenylamine (PTPA3) and a flexo printed anode (PEDOT:PSS, Pani, Carbon Black). Best electrical characteristics were obtained with diodes consisting Copper and Carbon Black as electrodes. With a thickness of the semiconducting layer of ~200 nm diodes with a cut-off frequency above 1 MHz could be demonstrated. These diodes showed also a good stability when exposed to UV-light, moisture and temperature.:Inhaltsverzeichnis 1 Einleitung 2 Metall-Halbleiter-Kontakt 2.1 Idealer Metall-Halbleiter-Kontakt 2.2 Metall-Halbleiter-Kontakt unter Spannung 2.3 Realer Metall-Halbleiter-Kontakt 2.3.1 Metall-Halbleiter-Kontakte ohne Grenzflächenzustände innerhalb der Bandlücke 2.3.2 Metall-Halbleiter-Kontakt mit Grenzflächenzuständen 2.4 Grenzflächen zwischen Metallen und organischen Materialien 2.5 Transportmechanismen / -modelle 2.5.1 Ladungstransport in organischen Halbleitern 2.5.2 Thermionische Emission 2.5.3 Fowler-Nordheim-Tunneln 2.5.4 Raumladungsbegrenzte Ströme 2.6 Poole-Frenkel Effekt 3 Stabilität organischer Materialien 3.1 Einfluss von Sauerstoff 3.2 Einfluss von Wasser 3.3 Einfluss von chemischen Reaktionen 3.4 Einfluss von elektrischem Stress 3.5 Einfluss von Licht 3.6 Einfluss von Struktur- und Morphologieänderungen 3.7 Einfluss von kombinierten Effekten 3.8 Einfluss von Barriereschichten 4 Schottky-Dioden 4.1 Allgemeiner Aufbau 4.2 Stand der Technik 4.3 Anforderungen an Materialien für Schottky-Dioden 4.3.1 Kathode 4.3.2 Halbleiter 4.3.3 Anode 4.4 Gleichrichter 4.5 Logische Schaltungen mit Dioden 5 Rolle-zu-Rolle-Verfahren / Druckverfahren 5.1 Übersicht Druckverfahren / Beschichtungsverfahren 5.2 Bewertung der Verfahren für die Herstellung von Schottky-Dioden 6 Versuchsdurchführung 6.1 Druckversuche 6.1.1 Genutzte Druckmaschinen 6.1.2 Verwendete Materialien 6.2 Messverfahren 6.2.1 Morphologische Charakterisierung 6.2.2 Elektrische Charakterisierung 6.2.3 Strom-Spannungs-Charakterisitik 6.2.4 Kapazitätscharakteristik 6.2.5 Elektrische Eigenschaften der Anodenmaterialien 7 Ergebnisse der Druckversuche 7.1 Einfluss der Lösungsmittel 7.2 Einfluss der Druckgeschwindigkeit 7.3 Druck der Anode 8 Elektrische Charakterisierung der Dioden 8.1 Vergleich der Elektrodenmaterialien 8.2 Strom-Spannungs-Kennlinie in Sperrrichtung 8.3 Gleichmäßigkeit der Strom-Spannungs-Charakteristik 8.4 Einfluss des Lösungsmittelgemischs 8.5 Einfluss der Trocknungstemperatur 8.6 Kapazitätscharakteristika 9 Stabilität 9.1 Langzeitstabilität 9.2 Hysterese 9.3 Einfluss der Temperatur 9.4 Einfluss von Feuchtigkeit 9.5 Einfluss von Licht 9.6 Einfluss von elektrischem Stress 10 Anwendungen 10.1 Gleichrichter 10.2 Logische Schaltungen mit Dioden 11 Zusammenfassung Literaturverzeichnis Abbildungsverzeichnis Tabellenverzeichnis Formel- und Symbolverzeichnis Abkürzungsverzeichnis Danksagung Lebenslauf Veröffentlichungen Eigenständigkeitserklärung

La mise en œuvre de politiques néolibérales globalisantes, axées sur la gouvernance des marchés, a conduit à la délocalisation des sources d’emploi vers des centres de production spécifiques, obligeant ainsi la main-d’œuvre à s’y rapprocher. C'est le cas des paysans mexicains et guatémaltèques mobilisés année après année vers les champs et les serres du Québec par le biais du Programme des travailleurs agricoles saisonniers (PTAS) ou du volet agricole du Programme des travailleurs étrangers temporaires (VA-PTET). Individus qui font partie d'une main-d'œuvre vulnérable et flexible, et dont les conditions d'embauche violent les droits fondamentaux et du travail en les liant à un seul employeur, les obligeant à résider dans la propriété de l'employeur et les exposant à un rapatriement prématuré. Ce projet de recherche infère que l'affectivité et l'émotivité sont des sujets de plus en plus explorés en sciences sociales, en particulier en géographie. En intégrant la dimension émotionnelle, il souligne la nécessité d’examiner les récits émotionnels des ouvriers agricoles transmigrants mexicains et guatémaltèques, en se basant sur l’utilisation idéologique possible des émotions socialisées à plusieurs échelles par les acteurs qui gèrent les programmes qui les embauchent. Il en découle que la compréhension des émotions de ces travailleurs, associée à leur participation à des conditions de travail spécifiques définies par le PTAS et le VA-PTET, peut contribuer de manière significative aux études traitant de la relation entre émotivité et migration de travail masculine. Cette démonstration consiste à analyser les politiques et pratiques étatiques du Canada, du Mexique et du Guatemala, en utilisant des émotions telles que la peur, le désespoir, l’acquiescement et la résignation comme mécanismes de contrôle social au sein du PTAS et du VA-PTET; ainsi que la satisfaction et la fierté de remplir le rôle de fournisseur principal du foyer en tant que forme unique de masculinité proposée par ces programmes. En particulier, la relation entre les émotions, la masculinité et l'expérience du manque de pouvoir (powerlessness) est élucidée. De même, par le biais de l'imbrication des récits des travailleurs, l'interaction de différentes catégories discriminatoires est clarifiée, sur la base du genre masculin, rarement utilisée dans les études migratoires existantes. Enfin, nous analysons les discours de ceux qui restent dans les communautés d'origine, des épouses des travailleurs et de certaines personnes clés, afin de rendre compte des coûts émotionnels causés par l'absence de leurs maris/pères de leurs enfants.
The implementation of neoliberal globalizing policies, centered on the governance of markets, has led to the relocation of employment sources to specific production centers, forcing the workforce to move to them. Such is the case of the farm workers from Mexico and Guatemala that are mobilized year after year into Québec’s fields and greenhouses through the Seasonal Agricultural Workers Program (SAWP) and / or the Agricultural Stream of the Temporary Foreign Worker Program (AS-TFWP). Individuals who are part of a vulnerable and flexible labour force, and whose hiring conditions violate their fundamental and labour rights by tying them to a single employer, forcing them to reside in the employer's premises and exposing them to premature repatriation. This research project infers that affectivity and emotionality are increasingly explored topics in the social sciences, particularly in geography. By incorporating the emotional dimension, it exposes the need to examine the emotional narratives of Mexican and Guatemalan transmigrant farm workers, based on the possible ideological use of the emotions that are socialized in a multiscalar and spatial way by the actors who govern the programs that hire them. It therefore raises the question that understanding the emotions of these workers, associated with their participation under specific work conditions framed by the SAWP and the AS-TFWP can significantly contribute to studies that address the relationship between emotionality and male labour migration. This is demonstrated by analyzing Canadian, Mexican and Guatemalan state-driven policies and practices, using emotions such as fear, despair, acquiescence and resignation as mechanisms of social control within the SAWP and the AS-TFWP, along with satisfaction pride in fulfilling the breadwinner role as the unique form of masculinity proposed by these programs. In particular, the relationship between emotions, masculinity and the experience of powerlessness is elucidated. Likewise, through the interweaving of workers' narratives, the interaction of different discriminatory categories is clarified, based on the masculine gender, rarely used in existing migratory studies. Finally, we analyze the speeches of those who have been left behind, the wives of the workers and a few key people, in order to account for the emotional costs caused by the absence of their partners and fathers of their children.
La implementación de políticas neoliberales globalizantes, centradas en la gobernanza de los mercados, ha provocado una deslocalización de las fuentes de empleo hacia centros específicos de producción, forzando a la mano de obra a desplazarse hacia éstos. Tal es el caso de la población trabajadora proveniente de México y Guatemala que es movilizada año tras año hacia campos e invernaderos quebequenses a través del Programa de Trabajadores Agrícolas Temporales (PTAT) y/o del Rubro Agrícola del programa de Trabajadores Extranjeros Temporales (RA-PTET). Individuos que forman parte de una fuerza laboral vulnerable y flexible, y cuyas condiciones de contratación violan sus derechos fundamentales y de trabajo al sujetarlos a un solo empleador, obligarlos a residir en la propiedad de éste y exponerlo a la repatriación prematura. Este proyecto de investigación infiere que afectividad y emocionalidad son temáticas exploradas de manera creciente en las ciencias sociales, particularmente, en la Geografía. Al incorporar la dimensión emocional, expone la necesidad de examinar las narrativas emocionales de los trabajadores agrícolas transmigrantes mexicanos y guatemaltecos, partiendo del posible uso ideológico de las emociones que es socializado de manera multiescalar por los actores que gobiernan los programas que los contratan. Plantea entonces, que la comprensión de las emociones de dichos trabajadores, asociadas a su participación bajo condiciones labores específicas enmarcadas por el PTAT y el RA-PTET puede contribuir significativamente a los estudios que abordan la relación entre emotividad y migración laboral masculina. Esta demostración se realiza analizando las políticas y prácticas estatales canadienses, mexicanas y guatemaltecas, de utilización de emociones tales como miedo, la desesperanza, la aquiescencia y la resignación como mecanismos de control social al interior del PTAT y el RA-PTET; a la par de la satisfacción y orgullo de cumplir con el rol de proveedor principal del hogar como forma única de masculinidad propuesta por dichos programas. De manera particular, se dilucida la relación existente entre emociones, masculinidad y la experiencia de carencia de poder (powerlessness). Asimismo, a través del entretejido de las narrativas de los trabajadores se esclarece la interacción de distintas categorías discriminatorias, teniendo como base el género masculino, raramente utilizado en los estudios migratorios existentes. Finalmente, se analizan los discursos de quienes permanecen en las comunidades de origen, las esposas de los trabajadores y algunas personas clave, a fin de dar cuenta de los costos emocionales provocados por la ausencia de sus compañeros y padres de sus hija-os.