The goal of the master’s thesis was to propose two laboratory exercises, integrating newly purchased devices HTC Desire and Nokia N900. Designed tasks bring new technologies and services to education process. The first task examines the configuration of branch exchange Asterisk PBX and analyzes SIP protocol. Part of exercise is concentrated on high-speed data transmission in mobile and wireless networks, regarding to usability of VoIP technology. The second exercise introduces to vulnerability of VoIP technology. It contains simulations of attacks on branch exchange Asterisk, DoS attack and discusses methods to secure VoiP communication. The part of this exercise examines usage of HTC Desire phone, instead of ordinary Wi-Fi access point.

Master’s thesis is focused on financial controlling which is necessary to keep the liquidity of a company. Firstly, the Master’s thesis presents the theoretical base of the controlling in general. Secondly, the thesis describes on tasks and tools of the financial controlling. Then, financial and controlling analyzes, which were made in the Prvni brnenska strojirna, a.s., are used for the assessment and the suggestions for improvements of the company.

The goal of this master thesis was increase production efficiency of turning machine TORNOS MultiDECO 20/6, which are unique in the Czech Republic by their contruction. Based on data analyzed has been found few areas, where are possible improve operations to increase production efficiency. For improving production efficiency has been implemented several real devices on the turning machine. The next step has been identified the cause of increase consumption of cutting tool and proposal for reduce of used cutting tool.

Background: Many organizations lack the time, resources, or experience to derive a myriad of input factors impacting performance. Instead, developers use the trial and error approach to analyze the performance. The trial and error approach is difficult and time taking process when working with complex systems. Many factors impact the performance of real-time software systems. But the most important factors which impact the performance of the real-time software systems are identified in this research paper. Black box (performance) testing focuses solely on the outputs generated in response to the factors supplied while neglecting the internal components of the software. Objectives: The objective of this research is to identify the most important factors which impact the performance of real-time software systems. Identifying these factors helps developers in improving the performance of real-time software systems. The context in which the objective is achieved is an Online charging system, which is one of the software in Business support systems. In context, real-time systems, the traffic changes in a fraction of seconds, so it is important measuring the performance of these systems. Latency is also one of the major factors which impact the performance of any real-time system. Additionally, another motivation for this research is to explore a few other major factors which impact the performance. Methods: Systematic Mapping Study (SMS) and case study were conducted to identify the important factors which impact the performance of real-time software systems. Both the data collection methods, a survey and interviews were designed and executed to collect the qualitative data. Survey and interviews were conducted among 12 experienced experts who have prior knowledge regarding the performance of the system to know the most important factors that impact the performance of the online charging system. The qualitative data collected from the case study are categorized by using thematic analysis. From the logs, i.e., quantitative data collected from industry was analyzed by using random forest feature importance algorithm to identify the factors which have the highest impact on the performance of the online charging system. Results: Systematic mapping study was conducted in the literature to review the existing literature; 22 factors are identified from 21 articles. 12 new factors are identified from the survey, which was previously not identified in the literature study. From the available quantitative data based on the performance impact of the factors on the system, the factors are identified. Knowing these factors helps the developers to resolve the performance issues by allocating more number of virtual machines, thereby the performance of the system can be improved and also the behaviour of the system can be known. All these results are purely based on the expert's opinions. Conclusions: This study identifies the most important factors that impact the performance of real-time software systems. The identified factors are mostly technical factors such as CPU utilization, Memory, Latency, etc.. The objectives are addressed by selecting suitable research methods.

Orientador: Alice Assis / Resumo: A presente pesquisa partiu das inquietações de um professor de Física da Educação Básica relativa às atividades propostas no material desenvolvido pela Secretaria da Educação, do Estado de São Paulo, no que se refere ao seu potencial para viabilizar aos alunos o desenvolvimento das competências nele presentes. Ao analisar uma das situações de aprendizagem desse material, esse professor, que também é o pesquisador deste trabalho, percebeu que a postura do professor é determinante para tal desenvolvimento, o que gerou um sentimento de insatisfação em relação à sua própria prática docente. Frente a essas inquietações, a tese defendida neste trabalho partiu da premissa de que seria possível tornar as aulas desse professor mais profícuas, por meio de um ciclo de análise e reflexão sobre a própria prática docente, a fim de viabilizar o desenvolvimento das competências evidenciadas nesse material pelos alunos. Nessa perspectiva, esta pesquisa foi desenvolvida de acordo com uma abordagem qualitativa, com características que se aproximam de uma pesquisa ação, apoiada em um método dedutivo-hipotético, uma vez que segue o percurso de uma análise reflexiva do pesquisador enquanto sujeito de sua própria pesquisa. Nesse contexto, esse professor/pesquisador desenvolveu esta pesquisa com o objetivo de assumir uma postura que viabilizasse o desenvolvimento dessas competências pelos alunos, com uma sala da segunda série do Ensino Médio, da escola onde trabalhava. Para tanto, primeiramente, ana... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This research started from the concerns of a Basic Education Physics teacher regarding the activities proposed in the material developed by the Secretariat of Education, of the State of São Paulo, with regard to its potential to enable students to develop the skills present in it. When analyzing one of the learning situations of this material, this teacher, who is also the researcher for this work, realized that the teacher's posture is decisive for such development, which generated a feeling of dissatisfaction in relation to his own teaching practice. In the face of these concerns, the thesis defended in this work started from the premise that it would be possible to make the teacher's classes more fruitful, through a cycle of analysis and reflection on the teaching practice itself, in order to enable the development of the skills evidenced in this material by the students. In this perspective, this research was developed according to a qualitative approach, with characteristics that approximate an action research, supported by a deductive-hypothetical method, since it follows the path of a reflective analysis of the researcher as the subject of his own research . In this context, this teacher/researcher developed this research with the objective of assuming a posture that would enable the development of these skills by students, with a room in the second grade of high school, from the school where he worked. To do so, first, it analyzed and reflected on its own pedagogical ... (Complete abstract click electronic access below) / Doutor

As energy prices increase and the effect of global warming hits the world harder, the need of reducing our energy use, and by that decreasing our environmental footprint increases. According to the International Energy Agency the energy consumption hit a new record in 2019 with 419 EJ, corresponding to 36,6 Gt of carbon dioxide emissions. The building sector accounts for 40 % of the total energy consumption. According to the International Energy Agency, energy optimizing is the main key in the transit towards a more sustainable world and energy audits, or energy mapping, is in many cases the first step towards energy optimization. Sustainable Intelligence is a company working for long term, sustainable solutions for properties all over Sweden as well as Norway, Finland, Poland, and Latvia. Property automation is the main competence of the company. Another large sector at the company is the energy sector, where energy audits, energy declarations and energy consultations are made. This report aims to analyze the energy audit process of Sustainable Intelligence and hopefully find solutions to make their work more efficient. The study includes a case study where the energy audit process of Sustainable Intelligence was implemented and analyzed. The study showed that the current method used by SI has a good structure but that there is a room for improvements.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico / The main objective of this work is to analyze the behavior of guyed towers of different heights, subject to the following solicitations: wind loads, dead weight, and prestress of the stays. The study was done in order to better understand the influence of some static and dynamic parameters in these structures. Guyed towers are structures that are utilized in several applications, such as, for instance, transmission towers. Besides determining the best quantity, disposition, and inclination angle of the stays for these systems, it was verified the influence of different methods used to calculate wind loads in the following results: Von Mises stresses, forces on the stays, and the resulting displacement. The methods used were the ones mentioned in the Brazilian Standards NBR6123/1988, and in order to calculate the wind loads acting on the tower, algorithms in MATLAB® were implemented. The tower masts were designed using the admissible stress method. For the three-dimensional models in finite elements and their analysis, were elaborated APDLs (ANSYS Parametric Design Language) the structural systems, in such away to optimize the time spent on the modeling and to reduce possible source of uncertainty. The results analysis consists in evaluating the sensitivity of the design variables in terms of: Von Mises stresses, forces on the stays, and resulting displacements. Also, modal analyses were done to verify the influence of the support conditions on the base of the mast on the natural frequencies of the structure. The obtained results showed that the inclination angle of the stays with respect to the mast can be reduced, propitiating an area reduction occupied by the tower. It was also observed, that the resulting displacements of these structures are more sensitive to the studied parameters than the stresses and the forces on the stays. The studies done and the obtained results show a better understanding of the structural and the dynamic behaviors of this type of structure. / Este trabalho tem por objetivo analisar o comportamento de torres estaiadas de diferentes alturas. Estas estão sujeitas as solicitações de vento, peso próprio e pré-tensão nos estais. Foi feito um estudo com a finalidade de conhecer a influência de determinados parâmetros na resposta estática e dinâmica dessas estruturas. Torres estaiadas são estruturas utilizadas em diversas aplicações, como por exemplo, em torres de transmissão. Além, de determinar a quantidade, disposição e ângulo de inclinação ótimos dos estais para esses sistemas, verificouse ainda, a influência dos modelos de cálculo das solicitações de vento, sugeridos pela NBR 6123/1988, nas tensões de Von Mises, esforços nos estais e deslocamentos resultantes nas estruturas. Os mastros das torres foram dimensionados utilizando o método das tensões admissíveis. As solicitações advindas da atuação do vento nas torres foram obtidas através de algoritmos implementados em MATLAB®, utilizando os vários modelos de cálculo apresentados na norma brasileira. Para modelagem tridimensional em elementos finitos e realização das análises, foram elaboradas rotinas em linguagem APDLs (ANSYS Parametric Design Language) para os sistemas estruturais, de maneira a parametrizar os modelos e otimizar o tempo gasto na modelagem. Foi realizada uma análise para avaliar a sensibilidade de determinadas variáveis de projeto tais como, quantidade, posicionamento e ângulo de inclinação dos estais, em termos de tensões de Von Mises, esforços nos estais e deslocamentos resultantes. Ademais, foram realizadas análises modais para verificar a influência das condições de contorno da base do mastro sobre as freqüências naturais da estrutura. Os resultados obtidos mostraram que o ângulo de inclinação dos estais com relação ao mastro pode ser reduzido, propiciando uma redução da área ocupada pela torre. Observouse também, que os deslocamentos resultantes dessas estruturas são mais sensíveis aos parâmetros estudados do que as tensões e os esforços nos estais. Os estudos realizados e os resultados obtidos levam a uma melhor compreensão do comportamento estrutural e dinâmico desse tipo de estrutura. / Mestre em Engenharia Mecânica

Background and Purpose: The energy crisis that evolved from Russia’s attack on Ukraine had an impact on Swedish energy companies. Therefor these energy companies Karlstad Energy and Hedemora Energy published texts containing the word “energy crisis”. This study’s purpose was to understand how energy companies work with web published texts visually and textually after a crisis. To do this, the study focuses on the multimodal analysis method on texts from Karlstad Energy and Hedemora Energy.     Method: The study found usage of the semiotic visual analysis method and the content analysis method on the texts to answer the sought-out question that was created from the study’s purpose. These methods have different recommendations to help analyze material and which has been used to answer the study’s question. This was done to analyze the texts from Karlstad Energy and Hedemora Energy individually, then these analyses were put against each other to find differences and similarities.     Results and Conclusion: The results that came from these analyzes were that the companies Karlstad energy and Hedemora energy work differently on the web. They have multiple visual differences like their usage of color, divisions of the text on the web, usage of pictures and textual differences such as their response possibilities and their CEOs participation to the text and usage of the word “we”. Then there were some similarities, such as the company’s usage of big texts, their order of themes of texts and their statement of facts. With this, the Conclusion is that these companies, Karlstad Energy and Hedemora Energy work differently visually and textually. / Bakgrund och syfte: Rysslands angrepp mot Ukraina har medfört en energikris som påverkat energiföretag. Energiföretagen Karlstad Energi och Hedemora Energi har publicerat texter på sina webbsidor som nämner ordet ”energikrisen”. Studiens syfte är att förstå hur energiföretag använder sig av webben för kommunikation under och efter en kris. För detta syfte genomförs en multimodal analys av Karlstad Energi och Hedemora Energis publicerade texter på webben.     Metod: Den multimodala analysmetoden med specifikation av den semiotiska visuella analysmetoden och innehållsanalysmetoden användes för att besvara studiens frågeställning och konstruerades utifrån studiens syfte. Dessa metoder har flera rekommendationer som hjälper med analyserna och dessa användes för att få fram svaren till de visuella och textuella analyserna. Därmed analyserades texterna från webben individuellt och ställdes därefter emot varandra för att finna skillnader och likheter.     Resultat och slutsats: Det resultat som framgick var att företagen Karlstad Energi och Hedemora Energi har olika arbetssätt även om de är inom samma bransch. De har flera visuella kontraster som färgval, uppdelning av text på webben, användning av bilder, och flera textuella skillnader som responsmöjlighet, VDs tillägg till texten, användningen av ordet ”vi” m.fl. Likheter fanns i användningen av fetstil, rangordningen av teman och framkodning av påståenden. Resultatet är slutsatsen att företagen jobbar helt olika både visuellt som textuellt, även om de är inom samma bransch.

Uma das modalidades de operadoras que mais têm tido dificuldade na sobrevivência são as filantrópicas, apesar de sua importância para o setor de saúde. Entre as dificuldades, a principal delas está relacionada a parte financeira. Foi utilizada, neste estudo, uma abordagem quanti-qualitativa, sendo a primeira etapa um conjunto de indicadores econômico-financeiros para analisar o impacto da gestão financeira no desempenho das operadoras de planos de saúde. Na etapa qualitativa, estudou-se em profundidade duas operadoras de planos de saúde filantrópicas. Ainda que muito se discuta acerca da sinistralidade, o custo das operadoras não representa um diferencial entre elas, tendo como principal fator competitivo e de sobrevivência a gestão financeira. Foi possível identificar que práticas como instituição de comitê financeiro, realizações diárias e definição de caixa mínimo aprimoram o desempenho da OPS. Nesse sentido, é essencial que as companhias deste segmento direcionem esforços para a melhoria da gestão financeira, uma vez que os custos estão equiparados para operadoras de bom e mau desempenho financeiro. / One of the modalities of operators who have had the most difficulty in survival are the philanthropic ones, despite their importance for the health sector. Among the difficulties, the main one is related to the financial part. In this sense, the study used a quantitative-qualitative approach, the first stage being a set of economic-financial indicators to analyze the impact of financial management on the performance of healthcare plan operators. At the qualitative stage, two philanthropic health plan operators were studied and depth. Although much is discussed about the accident rate, the cost of the operators does not represent a differential between them, having as main competitive and survival factor the financial management. It was possible to identify that practices such as financial committee institution, daily realizations and definition and minimum cash register improve health plan operator\'s performance. In this sense, it is essential that companies in this segment direct efforts to improve financial management, since the costs are equated to operators with good and poor financial performance.