No description available.

Inspired by a planar partitioning problem involving multiple unbounded chambers, this thesis investigates using classical techniques what can be said of the existence, uniqueness, and regularity of minimizers in a certain free-endpoint isoperimetric problem. In two cases, a full existence-uniqueness-regularity result is proved using a convexity technique inspired by work of Talenti. The problem studied here can be interpreted physically as the identification of the equilibrium shape of a sessile liquid drop in half-space (in the absence of gravity). This is a well-studied variational problem whose full resolution requires the use of geometric measure theory, in particular the theory of sets of finite perimeter. A crash course on the theory required for the modern statement of the equilibrium shape theorem is presented in an appendix. / Thesis / Master of Science (MSc)

This work modifies Shamir’s algorithm by sharing a random key that is used to lock up the secret data; as against sharing the data itself. This is significant in cloud computing, especially with homomorphic encryption. Using web design, the resultant scheme practically globalises secret sharing with authentications and inherent secondary applications. The work aims at improving cybersecurity via a joint exploitation of human factors and technology; a human-centred cybersecurity design as opposed to technology-centred. The completed functional scheme is tagged CDRSAS. The literature on secret sharing schemes is reviewed together with the concepts of human factors, trust, cyberspace/cryptology and an analysis on a 3-factor security assessment process. This is followed by the relevance of passwords within the context of human factors. The main research design/implementation and system performance are analysed, together with a proposal for a new antidote against 419 fraudsters. Two twin equations were invented in the investigation process; a pair each for secret sharing and a risk-centred security assessment technique. The building blocks/software used for the CDRSAS include Shamir’s algorithm, MD5, HTML5, PHP, Java, Servlets, JSP, Javascript, MySQL, JQuery, CSS, MATLAB, MS Excel, MS Visio, and Photoshop. The codes are developed in Eclipse IDE, and the Java-based system runs on Tomcat and Apache, using XAMPP Server. Its code units have passed JUnit tests. The system compares favourably with SSSS. Defeating socio-cryptanalysis in cyberspace requires strategies that are centred on human trust, trust-related human attributes, and technology. The PhD research is completed but there is scope for future work. / Petroleum Technology Development Fund (PTDF), Abuja, Nigeria.

No description available.

This diploma thesis inquires into the quality of the soils at 30 archaeological sites from the periods from Late Bronze Age to Early Bronze Age (1 250 - 450 BC). The aim of the thesis is to prove the dependence of the ratio of the cultivated cereals on the soil and other environmental factors in various regions. The secondary aim is the general observation of the changes, which could appear from this period until now. These changes are represented by the erosion, researched by various methods. The overview of the literature aims to the short description of the archaeological sources from the period, various approaches to the soil evaluation until present as well as information about the soil erosion and tools for its research. The conclusion of the thesis is that the ratio of the cultivated cereals depends mostly on the sea level, secondly on other environmental factors (included the soil quality). The results of the thesis are influenced by number of factors, discussed in the conclusion Keywords: soil quality, cereals, archaeological sites, perimeter of kilometre, soil erosion, late bronze age, early iron age

The ability to gather and process information regarding the condition of forest fires is essential to cost-effective, safe, and efficient fire fighting. Advances in sensory and autopilot technology have made miniature unmanned aerial systems (UASs) an important tool in the acquisition of information. This thesis addresses some of the challenges faced when employing UASs for forest-fire perimeter surveillance; namely, perimeter tracking, cooperative perimeter surveillance, and path planning. Solutions to the first two issues are presented and a method for understanding path planning within the context of a forest-fire environment is demonstrated. Both simulation and hardware results are provided for each solution.

Bronchial asthma incidence constitutes a compelling health and socioeconomical problem. Patients of all ages suffer from asthma, and no methods of effective prevention or healing are currently available. Poorly controlled asthma causes increase of financial expenditure as well as remarkable restriction of activities of daily living; it might even lead to death. In Czech republic, the number of patients with asthma is estimated at 500 000. The aim of this study is to evaluate effects of yoga exercise as a potential effective adjunct treatment on bronchial asthma state in adults. Theoretic part of the thesis describes pathological changes present in respiratory system, breathing pattern disorders and postural functions characteristic for patients suffering asthma disease. It also represents a brief summary of up to date findings of possible mechanisms on which are Spiral yoga and pranayama based, especially on these which can have an influence on obstructive lung disorders. Experimental part deals with the methodology and it reveals the process of making randomized clinical pilot study. Between 11 adult participants were investigated at the start and at the end of a three-month- long therapy. Investigation included pulmonary function tests, thoracic perimeter measurement, spine mobility...

O presente trabalho analisa os fatores ambientais que influenciem e ocasionem interveniência no estabelecimento de limites geográficos ou perímetro de uma área de proteção ambiental. Essa categoria de unidade de conservação - no Brasil - cuja finalidade e objetivos não encontram exemplar em nenhum outro sistema de unidades de conservação no mundo, é um instrumento legal que, em linhas gerais, procura direcionar o desenvolvimento sustentável da área. Como contribuição ao planejamento de uso e ocupação do solo em APA, depreende-se que esta categoria de UC é importante como um dos instrumentos da política nacional do meio ambiente, por incorporar a necessidade de proteção dos recursos naturais aliada ao desenvolvimento socieconômico. Como um dos resultados, propõe-se a ponderação dos fatores ambientais que ensejam a criação da APA, realizando procedimento de análise integrada de recursos, por meio de sobreposição de informações e por meio de interseção desses atributos para, posteriormente, traçar a delimitação da categoria área de proteção ambiental devem obedecer às especificidades locais, aos objetos de proteção que se deseja obter, garantindo a identidade desta unidade de conservação e, também, aos atributos ambientais em seu tríplice aspecto: antrópico (social, econômico, político, arqueológico e cultural), físico e biológico. O estudo de caso permite um análise dos atributos que compõem a paisagem da porção norte da APA Corumbataí e sua influência na ordenação especial de seu perímetro. / The present work analyse environmental factors that cause influence for establishing geographical limits ar perimeter of an Environmental Protection Area. This category - in Brazil - whose purpose and objectives don\'t find imitation in any other protected areas system around the world, is a legal instrument that, in general, allows sustainable development of this area. As contribution to land use planning in APA, this category is important as one of Environmental National Policy instruments, for incorporating need to protect natural resources joined social and economical development. As one of results, purposes environmental factors consideration that bring opportunity to APA\'s creation, accomplishing procedure of resources integrated analysis, through spatial information\'s overlay and through attributes intersection for drawing perimeter delimitation. Therefore, criteria of Environmental Protection Area delimitation should obey local specificity, protection objectives that wants to achieve, guaranteeing identity of this protected area and, also, environmental attributes in its triple aspect: anthropic (social, economical, political, archaeological and cultural), physical and biological. Case study allowed attributes analysis that compose APA Corumbataí\'s landscape North area and its influence in spatial ordination of perimeter.

Made available in DSpace on 2016-04-27T16:57:16Z (GMT). No. of bitstreams: 1 Gilberto Pereira Paulo.pdf: 2990932 bytes, checksum: c1f553be94071e816872486983b293f3 (MD5) Previous issue date: 2012-05-31 / This research had the purpose of studying the teaching and learning processes of concepts of circumference perimeter and circle areas on Junior High School. To develop the investigations, we sought to answer the following question: a didactic sequence with activities enabling the student to compare circumference perimeter and circle areas with perimeter area of other figures would minimize difficulties in the comprehension and differentiation of these two mathematical objects? Researches grounded in the didactic situation theory, in the dialectic of tool-object and semiotic presentation records, as well as principles of didactic Engineering. Target-public of the study is composed by students oh 9th year of Junior High School. Its results indicated an advance in the comprehension of the meaning of area as greatness and differentiation between circumference and circle, as well as between area and perimeter / Esta pesquisa teve como objetivo estudar os processos de ensino e aprendizagem dos conceitos de área de circulo e perímetro de circunferência no Ensino Fundamental II. Para desenvolver a investigação, buscou-se responder à seguinte questão: uma sequência didática, com atividades que permitam ao aluno à comparação de área do círculo e perímetro da circunferência com a área e perímetro de outras figuras, minimizaria as dificuldades na compreensão e diferenciação desses dois objetos matemáticos? O pesquisador apoiou-se na teoria das situações didáticas, na dialética ferramenta-objeto e nos registros de representação semiótica, assim como nos princípios da Engenharia Didática. O público-alvo do estudo compôs-se de alunos de 9º ano do Ensino Fundamental. Seus resultados indicaram um avanço na compreensão do significado de área como grandeza e na diferenciação entre circunferência e círculo, assim como entre área e perímetro

O objetivo deste trabalho foi identificar e analisar como os estudantes compreendem os conceitos de área e perímetro. A escolha do tema se deu durante nossa experiência docente ao observarmos a dificuldade de estudantes ao resolverem problemas em geometria. Para atingir tal objetivo trabalhou-se com uma turma do nono ano do ensino fundamental, durante nove horas-aula, uma sequência de atividades. Estes alunos participantes da pesquisa pertencem a uma escola pública da rede estadual, situada próximo ao centro de Porto Alegre, Rio Grande do Sul. Nossa principal base teórica foi a Teoria dos Campos Conceituais de Gérard Vergnaud e os estágios da aprendizagem de grandezas propostos por Plaza e Gómez. Com o auxílio desta teoria elaboramos as atividades, e procuramos entender como os estudantes compreendem as ideias de área e perímetro. Nestas atividades foram propostos problemas que discutiam o tema, os estudantes eram convidados a medir, visualizar construções geométricas, aplicar os conceitos e executarem cálculos. A partir destes dados foram feitas discussões sobre o porquê dos alunos apresentarem dificuldades e/ou êxitos nos problemas. Por analisarmos as resoluções de cada aluno, podemos afirmar que nossa metodologia foi qualitativa voltada a um estudo de caso. A partir das análises destas resoluções, embasado em Plaza e Gómez, Vergnaud e em outros autores que discutiram o tema, elaboramos uma sequência didática como uma proposta que auxilie os estudantes a compreenderem área e perímetro. Verificamos que muitos dos erros cometidos pelos estudantes estavam ligados a um mau entendimento dos conceitos envolvidos nos problemas, e que a maioria, durante a resolução das atividades, tentava aplicar as definições e fórmulas mesmo em situações que não fazia sentido aplicá-las. Verificamos, também, algumas indicações de que uma reconstrução destes conceitos, através da sequência proposta, é possível. / The aim of this paper has been to identify and analyse how the students understand the concepts of area and perimeter. The choice of this topic happened during our teaching experience while observing the difficulty of the students in solving geometry problems. To reach this aim, we have worked with a ninth year of primary school class, during nine classes, using a sequence of activities. These students, who participated in the study, belong to a state school, located near Porto Alegre downtown, Rio Grande do Sul. Our main theoretical framework was Gérard Vergnaud’s Theory of Conceptual Fields and the stages of quantities of learning proposed by plaza and Gómez. With the help of this theory, we elaborated the activities and tried to comprehend how the students understand the ideas of area and perimeter. In these activities, problems that discussed the topic were proposed, in which the students were invited to measure, visualise geometric constructions, apply the concepts and execute the calculations. From this data, discussions on the reason the students have difficulties and/or success with the problems happened. As we analysed the answers of each student, we can affirm that our methodology was a qualitative study with case study approach. From the analyses of these answers, based on Vergnaud, Plaza e Gómez and other authors who have discussed the topic, we elaborated a didactic sequence with a proposal that helps the students to understand area and perimeter. It was verified that many of the mistakes made by the students were connected to a poor understanding of the concepts involved in the problems, and, most of them, during the solution of the problems, tried to apply the definitions and formulas even when it didn’t make any sense. It was also verified that some indicatives of a reconstruction of these concepts, through the proposed sequence, is possible.