To see the other types of publications on this topic, follow the link: Block diagrams.
Dissertations / Theses on the topic 'Block diagrams'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Block diagrams.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Enoiu, Eduard. "Model Checking-Based Software Testing for Function-Block Diagrams." Licentiate thesis, Mälardalens högskola, Inbyggda system, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-26003.
Full textAbstract:
Software testing becomes more complex, more time-consuming, and more expensive. The risk that software errors remain undetected and cause critical failures increases. Consequently, in safety-critical development, testing software is standardized and it requires an engineer to show that tests fully exercise, or cover, the logic of the software. This method often requires a trained engineer to perform manual test generation, is prone to human error, and is expensive or impractical to use frequently in production. To overcome these issues, software testing needs to be performed earlier in the development process, more frequently, and aided by automated tools. We devised an automated test generation tool called COMPLETETEST that avoids many of those problems. The method implemented in the tool and described in this thesis, works with software written in Function Block Diagram language, and can provide tests in just a few seconds. In addition, it does not rely on the expertise of a researcherspecialized in automated test generation and model checking. Although COMPLETETEST itself uses a model checker, a complex technique requiring a high level of expertise to generate tests, it provides a straightforward tabular interface to the intended users. In this way, its users do not need to learn the intricacies of using this approach such as how coverage criteria can be formalized and used by a model checker to automatically generate tests. If the technique can be demonstrated to work in production, it could detect and aid in the detection of errors in safety-critical software development, where conventional testing is not always applicable and efficient. We conducted studies based on industrial use-case scenarios from Bombardier Transportation AB, showing how the approach can be applied to generate tests in software systems used in the safety-critical domain. To evaluate the approach, it was applied on real-world programs. The results indicate that it is efficient in terms of time required to generate tests and scales well for most of the software. There are still issues to resolve before the technique can be applied to more complex software, but we are already working on ways to overcome them. In particular, we need to understand how its usage in practice can vary depending on human and software process factors.
2
Kunze, Sebastian. "Automated Test Case Generation for Function Block Diagrams using Java Path Finder and Symbolic Execution." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-28315.
Full text
3
Neubauer, Tomáš. "Databázová podpora hodnocení rizik strojů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228133.
Full textAbstract:
This diploma thesis focuses on the problem of machinery safety. Aim of this thesis was to elaborate the analysis and to choose the pivot elements for sorting data in the database for risk analysis. Next aims was to make the structure of the database and to create SW modules of application for machinery risk assessment.
4
Janert, Philipp Klaus. "Phase behavior of homopolymer/diblock blends /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9763.
Full text
5
Gomes, Evandro de Carvalho. "PROJETO DE CONTROLADORES PARA CONVERSORES CC-CC PELA ABORDAGEM DO DESACOPLAMENTO DE ESTADOS." Universidade Federal do Maranhão, 2009. http://tedebc.ufma.br:8080/jspui/handle/tede/422.
Full textAbstract:
Made available in DSpace on 2016-08-17T14:53:05Z (GMT). No. of bitstreams: 1
Evandro de Carvalho Gomes.pdf: 6042842 bytes, checksum: 26caa437e6eddbd118b3278d1421a757 (MD5)
Previous issue date: 2009-09-11In this work, we propose to analyze the controller design of a classical dc-dc converter in a different manner. Instead of the traditional mathematics transfer function analysis, we will describe the block diagram of the plant to be controlled using Space-State Averaging, decoupling the states effects one acts each other and designing the controllers individually. With this technique, we can obtain first order transfer function allowing easier synthesis and design of the involved controllers. Outcomes are compared to controllers based on K-factor approach which are entirely applicable in academy and industry environment.
Neste trabalho propomos analisar o projeto de controladores para conversores cc-cc clássicos de uma forma diferente da tradicional análise matemática da função de transferência, descrevendo o diagrama de blocos da planta a ser controlada, desacoplando os efeitos que um estado exerce sobre o outro e projetando os controladores individualmente. Com essa técnica, obtêm-se funções de transferências de primeira ordem o que permite um projeto e síntese mais fácil dos controladores envolvidos. Os resultados são comparados com os controladores baseados na abordagem do fator K, por se tratar de uma abordagem amplamente aplicada no meio acadêmico e industrial.
6
SILVA, Bruno. "A framework for availability, performance and survivability evaluation of disaster tolerant cloud computing systems." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18035.
Full textAbstract:
Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-10-31T13:02:48Z
No. of bitstreams: 2
license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)
Bruno_Silva_Doutorado_Ciencia_da_Computacao_2016.pdf: 7350049 bytes, checksum: f6bc77a5446b293d932df5ac54dad560 (MD5)Made available in DSpace on 2016-10-31T13:02:48Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Bruno_Silva_Doutorado_Ciencia_da_Computacao_2016.pdf: 7350049 bytes, checksum: f6bc77a5446b293d932df5ac54dad560 (MD5) Previous issue date: 2016-02-26
CNPq
Cloud Computing Systems (CCSs) allow the utilization of application services for users around the world. An important challenge for CCS providers is to supply a high-quality service even when there are failures, overloads, and disasters. A Service Level Agreement (SLA) is often established between providers and clients to define the availability, performance and security requirements of such services. Fines may be imposed on providers if SLA’s quality parameters are not met. A widely adopted strategy to increase CCS availability and mitigate the effects of disasters corresponds to the utilization of redundant subsystems and the adoption of geographically distributed data centers. Considering this approach, services of affected data centers can be transferred to operational data centers of the same CCS. However, the data center synchronization time increases with the distance, which may affect system performance. Additionally, resources over-provisioning may affect the service profitability, given the high costs of redundant subsystems. Therefore, an assessment that include performance, availability, possibility of disasters and data center allocation is of utmost importance for CCS projects. This work presents a framework for geographically distributed CCS evaluation that estimates metrics related to performance, availability and disaster recovery (man-made or natural disasters). The proposed framework is composed of an evaluation process, a set of models, evaluation tool, and fault injection tool. The evaluation process helps designers to represent CCS systems and obtain the desired metrics. This process adopts a formal hybrid modeling, which contemplates CCS high-level models, stochastic Petri nets (SPN) and reliability block diagrams (RBD) for representing and evaluating CCS subsystems. An evaluation tool is proposed (GeoClouds Modcs) to allow easy representation and evaluation of cloud computing systems. Finally, a fault injection tool for CCSs (Eucabomber 2.0) is presented to estimate availability metrics and validate the proposed models. Several case studies are presented and analyze survivability, performance and availability metrics considering multiple data center allocation scenarios for CCS systems.
Sistemas de Computação em Nuvem (SCNs) permitem a utilização de aplicações como serviços para usuários em todo o mundo. Um importante desafio para provedores de SCN corresponde ao fornecimento de serviços de qualidade mesmo na presença de eventuais falhas, sobrecargas e desastres. Geralmente, um acordo de nível de serviço (ANS) é estabelecido entre fornecedores e clientes para definição dos requisitos de disponibilidade, desempenho e segurança de tais serviços. Caso os parâmetros de qualidade definidos no ANS não sejam satisfeitos, multas podem ser aplicadas aos provedores. Nesse contexto, uma estratégia para aumentar a disponibilidade de SCNs e mitigar os efeitos de eventuais desastres consiste em utilizar subsistemas redundantes e adotar de centros de dados distribuídos geograficamente. Considerando-se esta abordagem, os serviços de centros de dados afetados podem ser transferidos para outros centros de dados do mesmo SCN. Contudo, o tempo de sincronização entre os diferentes centros de dados aumenta com a distância entre os mesmos, o que pode afetar a performance do sistema. Além disso, o provisionamento excessivo de recursos pode afetar a rentabilidade do serviço, dado o alto custo dos subsistemas redundantes. Portanto, uma avaliação que contemple desempenho, disponibilidade, possibilidade de desastres e alocação de centro de dados é de fundamental importância para o projeto de SCNs. Este trabalho apresenta um framework para avaliação de SCNs distribuídos geograficamente que permite a estimativa de métricas de desempenho, disponibilidade e capacidade de recuperação de desastres (naturais ou causados pelo homem). O framework é composto de um processo de avaliação, conjunto de modelos, ferramenta de avaliação e ferramenta de injeção de falhas. O processo de avaliação apresentado pode auxiliar projetistas de SCNs desde a representação do sistem de computação em nuvem até a obtenção das métricas de interesse. Este processo utiliza uma modelagem formal híbrida, que contempla modelos de SCN de alto nível, redes de Petri estocásticas (RPEs) e diagramas de bloco de confiabilidade (DBCs) para representação e avaliação de SCNs e seus subsistemas. Uma ferramenta de avaliação é proposta (GeoClouds Modcs) que permite fácil representação e avaliação de sistemas de computação em nuvem. Por fim, uma ferramenta de injeção de falhas em SCN (Eucabomber 2.0) é apresentada para estimar métricas de disponibilidade e validar os modelos propostos. Vários estudos de caso são apresentados e estes analisam a capacidade de recuperação de desastres, desempenho e disponibilidade de SCNs distribuídos geograficamente.
7
Abdulhameed, Abbas Abdulazeez. "Combining SysML and SystemC to Simulate and Verify Complex Systems." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2045/document.
Full textAbstract:
De nombreux systèmes hétérogènes sont complexes et critiques. Ces systèmes intègrent du logiciel et des composants matériels avec des interactions fortes entre ces composants. Dans ce contexte, il est devenu absolument nécessaire de développer des méthodologies et des techniques pour spéciier et valider ces systèmes.Dans l'ingénierie des systèmes, les exigences sont l'expression des besoins qu'un produit spécifique ou un service doit réaliser. Elles sont définies formellement à de nombreuses occasions dans l'ingénierie des systèmes complexes. Dans ce type de système, deux catégories d'exigence sont présentes : les exigences non-fonctionnelles telles que la performance et la fiabilité, les exigences fonctionnelles telles que la vivacité. Pour valider ces exigences, un environnement permettant de simuler et vérifier ces propriétés est essentiel.Dans notre travail, nous proposons une méthodologie basée sur SysML et combinée avec SystemC et Promela/SPIN pour spéciier et valider des systèmes complexes. Cette approche est basée sur l'ingénierie dirigée par les modèles pour premièrement traduire des modèles SysML en SystemC afin de réaliser des simulations et deuxièmement traduire des diagrammes d'état SysML en Promela/SPINain de vérifier des propriétés temporelles extraites des exigences. Cette approche est expérimentée sur une étude de cas pour démontrer sa faisabilitéHeterogeneous Systems are complex and become very critical. These systems integrate software andhardware components with intensive interaction between them. In this context, there is a strongnecessity to develop methodologies and techniques to specify and validate these systems.In engineering, the requirements are the expression of needs on what a particular product or a serviceshould be or to make. They are used most of the time in a formal sense in the systems engineering.In this kind of systems, several types of requirements are present: non-functional requirements suchas the performance and the reliability and functional requirements such as the liveliness. To validatethese requirements of a system, an environment to simulate and to check the properties is essential.In our work, we propose a methodology based on SysML combined with SystemC and Promela/SPINto specify and validate complex systems. This approach is based on Model Driven Engineeringtechniques to irstly translate SysML models to systemC with the aim of simulation and to mapSysML behavioral diagrams to Promela/SPIN in order to verify temporal properties extracted fromthe requirements. The approach is experimented on case studies to demonstrate its feasibility
8
CALLOU, Gustavo Rau de Almeida. "Assessment to support the planning of sustainable data centers with high availability." Universidade Federal de Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/12262.
Full textAbstract:
The advent of services such as cloud computing, social networks and e-commerce has led
to an increased demand for computer resources from data centers. Prominent issues for
data center designers are sustainability, cost, and dependability, which are significantly
affected by the redundant architectures required to support these services. Within this
context, models are important tools for designers when attempting to quantify these
issues before implementing the final architecture.
This thesis proposes a set of models for the integrated quantification of the sustainability
impact, cost, and dependability of data center power and cooling infrastructures.
This is achieved with the support of an evaluation environment which is composed of
ASTRO, Mercury and Optimization tools. The approach taken to perform the system
dependability evaluation employs a hybrid modeling strategy which recognizes the advantages
of both stochastic Petri nets and reliability block diagrams. Besides that, a model
is proposed to verify that the energy flow does not exceed the maximum power capacity
that each component can provide (considering electrical devices) or extract (assuming
cooling equipment). Additionally, an optimization method is proposed for improving the
results obtained by Reliability Block Diagrams, Stochastic Petri nets and Energy Flow
models through the automatic selection of the appropriate devices from a list of candidate
components. This list corresponds to a set of alternative components that may compose
the data center architecture.
Several case studies are presented that analyze the environmental impact and dependability
metrics as well as the operational energy cost of real-world data center power and
cooling architectures.Submitted by João Arthur Martins (joao.arthur@ufpe.br) on 2015-03-12T18:54:10Z No. of bitstreams: 2 Tese Gustavo Callou.pdf: 4626749 bytes, checksum: 336a34ffc39f6ac623fa1144de2a66bf (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)
Made available in DSpace on 2015-03-12T18:54:10Z (GMT). No. of bitstreams: 2 Tese Gustavo Callou.pdf: 4626749 bytes, checksum: 336a34ffc39f6ac623fa1144de2a66bf (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2013-11-12
O surgimento de servi¸cos como computa¸c˜ao nas nuvens, redes sociais e com´ercio eletrˆonico tem aumentado a demanda por recursos computacionais dos data centers. Preocupa¸c˜oes decorrentes para os projetistas de data center s˜ao sustentabilidade, custo, e dependabilidade, os quais s˜ao significativamente afetados pelas arquiteturas redundantes requeridas para suportar tais servi¸cos. Nesse contexto, modelos s˜ao ferramentas importantes para projetistas quanto a tentativa de quantificar esses problemas antes mesmo de implementar a arquitetura final. Nessa tese, um conjunto de modelos ´e proposto para a quantifica¸c˜ao integrada do impacto na sustentabilidade, custo e dependabilidade das infraestruturas de refrigeramento e potˆencia de data centers. Isso ´e obtido com o suporte do ambiente de avalia¸c˜ao que ´e composto pelas ferramentas ASTRO, Mercury e o m´odulo de otimiza¸c˜ao. A avalia¸c˜ao de dependabilidade faz uso de uma estrat´egia de modelagem h´ıbrida que usa as vantagens tanto das redes de Petri estoc´asticas como dos diagramas de blocos de confiabilidade. Al´em disso, um modelo ´e proposto para realizar a verifica¸c˜ao se fluxo de energia n˜ao excede a capacidade m´axima de potˆencia que cada equipamento pode prover (considerando dispositivos el´etricos) ou extrair (assumindo equipamentos de refrigera¸c˜ao). Adicionalmente, um m´etodo de otimiza¸c˜ao ´e proposto para melhorar os resultados obtidos atrav´es dos diagramas de blocos de confiabilidade, das redes de Petri estoc´asticas e do modelo de fluxo de energia pela sele¸c˜ao autom´atica dos dispositivos apropriados a partir da lista de componentes candidatos. Essa lista corrresponde a um conjunto de componentes que podem ser utilizados para compor a arquitetura de data center. V´arios estudos de casos s˜ao apresentados para analisar o impacto ambiental, a dependabilidade e o custo operacional de energia el´etrica de arquiteturas reais de potˆencia e refrigera¸c˜ao de data centers.
9
Niemiec, Anna Barbara. "Propriedades de soluções de copolimeros estatisticos em comparação com copolimeros em bloco : diagramas de fase binarios e interação com surfatantes." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249598.
Full textAbstract:
Orientador: Watson LohTese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica
Made available in DSpace on 2018-08-13T12:49:24Z (GMT). No. of bitstreams: 1 Niemiec_AnnaBarbara_D.pdf: 1144305 bytes, checksum: 6f69691d41a98344e5cab64a46ba1a3c (MD5) Previous issue date: 2008
Resumo: O tema desta tese como sugerido pelo titulo aborda assuntos correlacionados com formação de sistemas binários de copolímeros em diferentes solventes como também com a interação entre copolímeros bloco e estatísticos de oxido de poli etileno e oxido de poli propileno com vários tipos de surfatantes iônicos: catiônicos, aniônicos e não iônicos. Os estudos deste trabalho foram divididos em três etapas, que foram concluídas com duas publicações e um manuscrito. Em primeiro artigo incluiu se todas as investigações correspondentes aos estudos de interação entre copolímeros em bloco P123 e surfatante não iônico C12EO6 monitorada por calorimetria e espalhamento de luz. Através deste estudo o novo fenômeno para sistema de P123 - C12EO6 foi observado, chamado de transição esferas-bastonetes e identificou-se alta aplicação de técnicas calorimétricas para monitoramento deste tipo de eventos intermoleculares. Este estudo foi executado em colaboração com o grupo de pesquisa da Universidade Lund na Suécia, que conduziu todos os experimentos que envolvem o espalhamento de luz. Por outro lado os experimentos na parte de calorimetria foram feitos dentro do nosso grupo. O segundo artigo descreve sistemas de copolímeros em bloco vs. estatísticos na interação com surfatantes iônicos: aniônicos, catiônicos. Estes estudos revelaram que copolímeros estatísticos interagem com copolímeros aniônicos da maneira parecida com que homopolímeros hidrofílicos. Efeito de temperatura foi investigado também através das técnicas calorimétricas e tendências previamente relatadas foram confirmadas. Como parte complementar a este artigo foram incluídos nesta tese alguns resultados calorimétricos da interação entre copolímeros estatísticos na região do ponto de turvação deles e surfatantes não iônicos, confirmando mais uma vez o que é conhecido da literatura que os surfatantes não-iônicos geralmente não interagem associativamente com polímeros não-iônicos e esta interação é especial para sistema P123 - C12EO6. Por último inclui se neste trabalho o manuscrito que contem um estudo comparativo de sistemas bifásicos de copolímeros em bloco vs. estatísticos. Verificou se neste estudo que os copolímeros estatísticos apresentam diferente comportamento na separação de fases, do que copolímeros em bloco. Devido a falta de auto - agregação destes copolímeros os pontos de turvação deles são menos elevados em comparação com copolímeros em bloco o que devido a esta propriedade tem enorme aplicação na área acadêmica em bioquímica e biotecnologia para purificação de materiais biológicos como também em outras áreas: analise de poluentes, compostos orgânicos,metais
Abstract: The subject of the thesis, as suggested by the title, draws on the formation of binary systems of copolymers in different solvents, as well as interaction of block and random copolymers of poly (ethylene oxide) and poly (propylene oxide) with various types of ionic surfactants: cationic, anionic and non-ionic. These studies are divided in three stages and each of it was concluded with publication or manuscript. In the first article it is included all investigation on interaction between block copolymer P123 and noni-onic surfactant C12EO6 monitored by calorimetry and light scattering. By applying these techniques a new phenomenon was observed in the P123-C12EO6 system, namely a well-defined sphere-to-rod transition of the mixed micelles and interesting application of calorimetric techniques has been identified due to its high sensitivity to this kind of intermolecular events detection. These studies were performed in collaboration with our partners from Lund University, Sweden, who conducted light scattering measurements. On the other hand, measurements on calorimetry have been done within our research group. Moreover, in the second paper interactions between random vs. block copolymers with ionic surfactants (cationic and anionic) has been discussed. These studies revealed an interaction similar to that observed with other hydrophilic homopolymers. Effects of temperature and of the nature of the ionic surfactants on their interaction with these copolymers were found to agree with the previously reported trends. As a complementary part of this article some additional results on interaction between random copolymer and non-ionic surfactants have been included in this thesis. Once again it was confirmed what is reported in the literature that non-ionic surfactants generally do not interact associatively with non-ionic polymers and interaction between P123 and C12EO6 is special to this system. As the last, it was included in this work the manuscript, which contains the comparative studies of biphasic systems constructed from block vs. random copolymers. It was verified in this studies that random copolymers present different phase behaviour than block copolymers. Lack of auto-association of these copolymers promotes their cloud points to be lower then cloud points of block copolymers. Due to this property these copolymers has enormous application in academic area in biochemistry or biotechnology for purification of biological materials as well as in other areas: for pollutants analysis, organic materials or metals
Doutorado
Físico-Química
Doutor em Ciências
10
Gabriel, Josef. "Block Diagram Simulator with Microcontroller-in-the-Loop capabilities." Thesis, Southern Illinois University at Edwardsville, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10014012.
Full textAbstract:
The thesis aims to create a proof of concept an open source student supported block diagram software, BlocSim. BlocSim demonstrates real time microcontroller-in-the-loop capabilities and block diagram simulation. The BlocSim has a drag and drop interface for ease of use. BlocSim creates journal quality block diagram images and the accompanying latex formatted code. BlocSim stores data in an xml format for future use.
11
Ascensão, Rafael das Almas. "Simulação de sistemas dinâmicos em Python." Master's thesis, Universidade de Évora, 2021. http://hdl.handle.net/10174/29050.
Full textAbstract:
O estudo e análise de sistemas dinâmicos é comum a várias áreas científicas,
sendo a abordagem a este tipo de sistemas facilitada através do uso de simuladores. Apesar de existirem alternativas open-source disponíveis, estas
apresentam algumas limitações o que por norma leva a que utilizadores optem por soluções ad-hoc. Por isso, tem-se verificado um interesse crescente
nesta área.
Este trabalho de dissertação de mestrado pretende apresentar o processo
de desenvolvimento de um simulador em que a especificação de sistemas dinâmicos e das suas interligações seja facilitada, permitindo o encapsulamento
de blocos noutros blocos. Pretende-se também que o simulador possibilite a
visualização gráfica dos sistemas e dos valores de output. Determinou-se que a
implementação do simulador seria feita em Python, pelas suas características
e pela popularidade da mesma na comunidade científica.
São ainda incluídas demonstrações do funcionamento do simulador com
sistemas que permitam demonstrar de modo básico as suas funcionalidades; Simulation of Dynamical Systems in Python
Abstract:
Analysis and study of dynamical systems is common in several scientific
fields, often aided by simulators used to simplify this task. Even though
there are open-sorce options available, these may have limitations that drive
users to develop their own ad-hoc solutions. Hence the growing interest in
this area.
This dissertation work aims to present the development process of a simulator that facilitates the specification of dynamical systems through the specification of block-diagrams and their interconnections, including the ability
to have encapsulation. The simulator should also allow graphical vizualization of the systems’ blocks and connections, and their output values. It
was decided that the simulator would be implemented using Python, due its
characteristics and its adoption by the scientific community.
Some examples of the simulator running basic systems are also provided
as a way of showing the functionality of the simulator in a simple manner.
12
Mayer, Andrew. "Diameter of a Rouquier block." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1523279464229599.
Full text
13
Hurtig, Christian. "Efficient FBD Test Generation Through Program Slicing." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-38568.
Full textAbstract:
Program slicing has been used as a way to improve the efficiency of debugging and program analysis. Nowadays, automated test generation is being used to create tests automatically by analysing the program structure and suggesting necessary tests. This kind of techniques are prone to efficiency problems when applied to large programs containing many lines of code. This is especially true for software in industrial practice, such as the ones running on Programmable logic controllers (PLC) that are used in a wide variety of tasks from toys to avionics and rail transport. Function Block Diagram (FBD) is a language used for programming PLCs that has gained lots of attention in industrial practice due to its graphical nature. These FBD programs are often used in real time and safety critical systems, and these systems require extensive testing in order to prove that they pass safety requirements of their respective domains. In order to improve the efficiency of applying automated test generation on FBD programs we propose two FBD program slicing algorithms based on the structure of these diagrams and how they are programmed. These FBD program slicing algorithms are applied on several industrial programs for PLCs in order to evaluate their feasibility and what effect slicing has on test generation. Six FBD programs were selected out of 189 provided by Bombardier Transportation Sweden AB. The six programs were sliced according to these FBD slicing algorithms and then evaluated in terms of efficiency and applicability. Our results suggest that slicing can be used to reduce the needed generation time and memory usage required for automated test generation. However, our observations show that slicing can also increase the number of test cases generated and how this test cases are merged into one test suite for the entire program.
14
Deribew, Dargie Hailu. "Structure, morphology and performance relationships of organic photovoltaic devices : the block copolymer approach." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-01055312.
Full textAbstract:
Ce travail se focalise sur l'étude de cellules solaires organiques modèles basées sur le mélange de poly(3-hexylthiophène) (P3HT) et de l'ester méthylique de l'acide [6,6]-phényl C61 butyrique (PCBM). La corrélation entre la morphologie de la couche active, les paramètres de mises en œuvre et le rendement photovoltaïque a été soigneusement étudiée afin d'obtenir l'optimisation de l'efficacité de tels dispositifs. Une méthode originale pour contrôler la séparation de phases dans ces mélanges a été proposée et consiste à l'intégration de copolymères blocs comme additifs. Trois copolymères séquencés ont été utilisés en tant qu'agents de nanostructuration et/ou d'agents de nucléation. Il a notamment été montré que l'incorporation de P3HT-b-PI permet l'augmentation du nombre de cristallites de P3HT tout en limitant l'agglomération du PCBM. D'autre part, l'incorporation de P3HT-b-P4VP dans les mélanges de P3HT:PCBM a permis de contrôler l'orientation des cristallites de P3HT, améliorant par ce fait le transport de charge dans les dispositifs.
15
Conradie, Pieter Daniel Francois. "Quantifying system reliability in rail transportation in an aging fleet environment." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96836.
Full textAbstract:
Thesis (MEng)--Stellenbosch University, 2015.ENGLISH ABSTRACT: In recent years, the management of physical assets has become increasingly important, even more so, in asset intensive organisations. This research work presents an overall approach to quantify reliability of rolling stock assets in the rail environment. The current maintenance management system in the case studied is over-reliant on cancellations and delays as reliability measure. The objectives of this study were, therefore, to develop a scientific approach to quantify the reliability of the rolling stock fleet and to develop a maintenance planning model based on system reliability. The research methodology followed made use of failure statistics, failure distributions and the interdependence of different systems to determine the impact of component failures on the overall system reliability. This could then be used to determine the reliability of individual train sets in order to better understand their performance. The reliability measure could be used for predicting component and train set failures as well as to better understand the contribution of maintenance towards reliability, hence the term Reliability Based Maintenance. The model, validated with real data, illustrates how the reliability measure can be used to determine maintenance intervals of different train sets. Based on the results, recommendations are made in relation to future planning of the maintenance strategy.
AFRIKAANSE OPSOMMING: Die bestuur van fisiese bates het in die afgelope tyd meer belangrik geword, veral in organisasies wat afhanklik is van hulle fisiese bates. Hierdie navorsing stel ‘n metode voor wat die betroubaarheid van rollende materiaal bates in die spoor bedryf kwantifiseer deur gebruik te maak van falingstatistiek. In die huidige instandhouding bestuurstelsel van die gevallestudie word daar te veel gesteun op kansellasies en vertragings van treine as ‘n betroubaarheids meting. Daarom was die doelwitte van die navorsing om ‘n wetenskaplike benadering te ontwikkel om betroubaarheid van rollende materiaal the kwantifiseer, en om ‘n instandhouding beplannings model voor te stel, gebaseer op sisteem betroubaarheid. Die navorsingsmetodologie is gebaseer op falingstatistieke, falingverspreidings, en die interafhanklikheid van stelsels word gebruik om die invloed van komponent falings op die betroubaarheid van die totale stelsel te bepaal. Hierdie benadering word dan gebruik om die betroubaarheid van individuele treinstelle en die werksverrigting van individuele trainstelle te bepaal. Hierdie instandhouding meting kan gebruik word om falings van komponente en treinstelle te voorspel, asook om die bydrae van instandhouding tot betroubaarheid beter te verstaan, daarom genoem Betroubaarheids Gebaseerde Instandhouding. Dit is ook geïllustreer hoe die betroubaarheid meting gebruik kan word om instandhouding intervalle te bepaal. Die betroubaarheid model is met werklike data gevalideer en aanbevelings word gemaak hoe om betroubaarheid te gebruik om die toekomstige beplanning van instandhouding te doen.
16
Finger, Anelisa Pedroso. "DIAGRAMAS DE MANEJO DA DENSIDADE PARA POVOAMENTOS DE Acacia mearnsii De Wild." Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/8785.
Full textAbstract:
Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorDensity management diagrams (DMD) is a tool used to carry out the prognosis of production in density, basal area and volume in order to establish management strategies for forest planning. The aim was to build a density management diagram for Acacia mearnsii De Wild. Data from 12 cities in the northeastern region of Rio Grande do Sul were used for the DMD construction. Since the Tang model had the best evaluation, it was used to select the maximum population density estimative, thus the density 1x1 was used to construction of the DMD. With the same model, self-thinning graphs and Stand Density Index (SDI) were generated; adopting a standard quadratic mean diameter of 10cm. Density levels were determined proportionally to SDI maximum density in 200 class intervals, with higher 2400 and lower 1400 SDI. The DMD were produced with an average diameter and density control, and volume and green rind bark weight per hectare. A second DMD model was developed in order to insert a site production control through the dominant height of the stand. These DMD models allowed estimating the volume and green rind bark with great precision, from the control of diameter, density and dominant height.
O Diagrama de Manejo da Densidade (DMD) é uma ferramenta utilizada para realizar a prognose da produção em densidade, área basal e volume a fim de estabelecer estratégias de manejo para o planejamento florestal. O objetivo do presente foi construir um diagrama de manejo da densidade para Acacia mearnsii De Wild., com dados dendrométricos provenientes de 12 municípios da região nordeste do Rio Grande do Sul. A máxima densidade populacional foi estimada pelo modelo de Tang, ajustado com dados de parcelas em espaçamento 1x1m. Com este modelo foram gerados os gráficos de autodesbaste e Índices de Densidade de Povoamento (IDP) para um diâmetro padrão de 10cm. Os níveis de densidade foram determinados, proporcionalmente, a partir da máxima densidade, por índice de densidade de povoamento (IDP), em intervalos de classe de 200, com IDP máximo 2400 e mínimo 1400. Os DMDs foram elaborados com controle de diâmetro médio e densidade populacional, e como variável de resposta o volume por hectare e o peso de casca verde por hectare. Um segundo modelo de DMD foi elaborado com o objetivo de inserir um controle produtivo dos sítios, através da altura dominante do povoamento. Estes modelos de DMD permitiram estimar o volume e peso de casca verde com ótima precisão, a partir do controle do desenvolvimento do diâmetro, densidade e altura dominante.
17
Nicolet, Célia. "Synthèse de (co)polymères à base de Poly(3-hexylthiophène) pour le photovoltaïque organique." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14412/document.
Full textAbstract:
L’optimisation de la morphologie de la couche active est primordiale pour l’augmentation des rendements des cellules solaires photovoltaïques organiques. Nous avons montré l’influence du ratio de matériaux donneur (P3HT) et accepteur (PCBM) d’électrons ainsi que de la masse molaire du P3HT sur la morphologie de la couche active. Afin de contrôler la séparation de phases entre les matériaux donneur et accepteur d’électrons, il est possible d’utiliser des copolymères à blocs afin d’aider la compatibilisation entre le P3HT et le PCBM. Nous avons choisi de synthétiser des copolymères à blocs P3HT-b-polystyrène et des P3HT-b-polyisoprène présentant une certaine compatibilité avec les matériaux de la partie active. L’ajout optimisé de P3HT-b-polyisoprène permet une augmentation de 30% des rendements et de 90% de durée de vie des cellules solairesActive layer morphology optimization is fundamental to achieve high efficiency in organic photovoltaic solar cells. We showed the influence of the donor (P3HT) and acceptor (PCBM) material ratio and the impact of the P3HT molecular weight on the active layer morphology. We demonstrated the possibility of using well-designed block copolymers to help P3HT and PCBM compatibilization and to control their phase separation. We chose to synthesize P3HT-b-polystyrene and P3HT-b-polyisoprene for which each block is compatible with the active materials. Optimal addition of P3HT-b-polyisoprene enables to get a 30%-improved efficiency and a 90%-enhanced lifetime of the solar cells
18
Lai, Tzu-Yu. "Phase Behavior Study and Thermoresponsive Bilayer Fabrication of Organogels." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron159068426588724.
Full text
19
Kukuczka, Adam. "Využití Bondových grafů pro modelování elektrických strojů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217638.
Full textAbstract:
Tato diplomová práce pojednává o možnostech simulace a modelování elektrických pohonů na základě Bondových grafů. Je zde uvedena základní teorie k problematice. V práci jsou představeny modely stejnosměrného a synchronního stroje sestavené touto technikou. Dále je zde seznámení s Freeware knihovnou Bondových grafů BG V2.1 k programu MATLABSimulink. Za pomocí této knihovny byly sestaveny oba modely strojů. V poslední kapitole je uvedeno srovnání modelování na základě teorie Bondových grafů s modelováním v blokových diagramech.
20
Trinh, Megan. "On the Diameter of the Brauer Graph of a Rouquier Block of the Symmetric Group." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron152304291682246.
Full text
21
Bellissimo, Michael Robert. "A LOWER BOUND ON THE DISTANCE BETWEEN TWO PARTITIONS IN A ROUQUIER BLOCK." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1523039734121649.
Full text
22
Helou, Alexis. "Beyond the trapping horizon : the apparent universe & the regular black hole." Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCC140.
Full textAbstract:
Dans le contexte de la Relativité Générale, le concept d'horizon permet de séparer l'espace-temps en zones de comportement causal différent. En particulier l'horizon apparent, et la notion très proche d'horizon de confinement, sont définis à partir de grandeurs locales. Nous sélectionnons ces horizons comme l'outil pertinent pour décrire les situations dynamiques à symétrie sphérique, telles que le trou noir ou la cosmologie. Le principe d'Holographie indique en effet que l'information contenue dans un volume donné serait encodée sur la surface renfermant le volume. Ainsi l'horizon apparent contiendrait des informations sur le trou noir qu'il délimite ou sur l'Univers qu'il borne. Dans cette optique, nous appliquons les lois de la thermodynamique à l'horizon apparent cosmologique, en utilisant un ensemble d'outils adaptés à la symétrie sphérique : le vecteur de Kodama, l'énergie de Misner-Sharp, la première loi unifiée. Ceci nous permet de retrouver les équations de Friedmann qui régissent la dynamique de notre Univers. Un paramètre de température thermodynamique est ensuite calculé, qui caractérise une émission à l'horizon. Ceci est ensuite généralisé aux trous blancs et cosmologies en contraction. Enfin nous étudierons le rôle de l'horizon apparent dans le paradoxe de l'information des trous noirsIn the context of General Relativity, the concept of horizon divides the spacetime into regions of different causal behaviour. In particular, the apparent horizon and closely related trapping horizon are defined from local quantities. We select these horizons as the relevant tool to describe spherically symmetric, dynamical situations, such as black holes or cosmology. Indeed the Holographic principle indicates that the information contained in the bulk of a given region, would be encoded on the boundary surface of the region. Then the apparent horizon would contain information on the black hole or on the Universe it bounds. In this optic, we apply the laws of thermodynamics to the cosmological apparent horizon, using a set of tools well-suited to spherical symmetry : the Kodama vector, the Misner-Sharp energy, the unified first law. This will allow us to recover the Friedmann equations, which govern the dynamics of our Universe. A thermodynamical parameter identified as a temperature is then computed, which characterizes the emission at the horizon. This is then generalized to white holes and contracting cosmologies. Finally we study the role of the apparent horizon in the information loss paradox for black holes
23
Råberg, Mathias. "Black liquor gasification : experimental stability studies of smelt components and refractory lining." Doctoral thesis, Umeå University, Energy Technology and Thermal Process Chemistry, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1151.
Full textAbstract:
Black liquors are presently combusted in recovery boilers where the inorganic cooking chemicals are recovered and the energy in the organic material is converted to steam and electricity. A new technology, developed by Chemrec AB, is black liquor gasification (BLG). BLG has more to offer compared to the recovery boiler process, in terms of on-site generation of electric power, liquid fuel and process chemicals. A prerequisite for both optimization of existing processes and the commercialization of BLG is better understanding of the physical and chemical processes involved including interactions with the refractory lining. The chemistry in the BLG process is very complex and to minimize extensive and expensive time-consuming studies otherwise required accurate and reliable model descriptions are needed for a full understanding of most chemical and physical processes as well as for up-scaling of the new BLG processes. However, by using these calculated model results in practice, the errors in the state of the art thermochemical data have to be considered. An extensive literature review was therefore performed to update the data needed for unary, binary and higher order systems. The results from the review reviled that there is a significant range of uncertainty for several condensed phases and a few gas species. This resulted in experimental re-determinations of the binary phase diagrams sodium carbonate-sodium sulfide (Na2CO3-Na2S) and sodium sulfate-sodium sulfide (Na2SO4-Na2S) using High Temperature Microscopy (HTM), High Temperature X-ray Diffraction (HT-XRD) and Differential Thermal Analysis (DTA). For the Na2CO3-Na2S system, measurements were carried out in dry inert atmosphere at temperatures from 25 to 1200 °C. To examine the influence of pure CO2 atmosphere on the melting behavior, HTM experiments in the same temperature interval were made. The results include re-determination of liquidus curves, in the Na2CO3 rich area, melting points of the pure components as well as determination of the extent of the solid solution, Na2CO3(ss), area. The thermal stability of Na2SO3 was studied and the binary phase diagram Na2SO4-Na2S was re-determined. The results indicate that Na2SO3 can exist for a short time up to 750 °C, before it melts. It was also proved that a solid/solid transformation, not reported earlier, occurs at 675 ± 10 °C. At around 700 °C, Na2SO3 gradually breaks down within a few hours, to finally form the solid phases Na2SO4 and Na2S. From HTM measurements a metastable phase diagram including Na2SO3, as well as an equilibrium phase diagram have been constructed for the binary system Na2SO4-Na2S. Improved data on Na2S was experimentally obtained by using solid-state EMF measurements. The equilibrium constant for Na2S(s) was determined to be log Kf(Na2S(s)) (± 0.05) = 216.28 – 4750(T/K)–1 – 28.28878 ln (T/K). Gibbs energy of formation for Na2S(s) was obtained as ΔfG°(Na2S(s))/(kJ mol–1) (± 1.0) = 90.9 – 4.1407(T/K) + 0.5415849(T/K) ln (T/K). The standard enthalpy of formation of Na2S(s) was evaluated to be ΔfH°(Na2S(s), 298.15 K)/(kJ mol–1) (± 1.0) = – 369.0. The standard entropy was evaluated to be S°(Na2S(s), 298.15 K)/(J mol–1 K–1) (± 2.0) = 97.0. Analyses of used refractory material from the Chemrec gasifier were also performed in order to elucidate the stability of the refractory lining. Scanning electron microscopy (SEM) analysis revealed that the chemical attack was limited to 250-300 μm, of the surface directly exposed to the gasification atmosphere and the smelt. From XRD analysis it was found that the phases in this surface layer of the refractory were dominated by sodiumaluminosilicates, mainly Na1.55Al1.55Si0.45O4.
24
Vieira, Eliane Ferreira Campos. "O bloco-diagrama na representação do relevo no 1 ano do ensino médio: uma análise a partir dos recursos cartográficos presentes em livros didáticos de geografia." Universidade Federal de Minas Gerais, 2005. http://hdl.handle.net/1843/MPBB-8TPFWU.
Full textAbstract:
As representações cartográficas constituem importantes recursos no ensino de Geografia e podem auxiliar o processo de construção de conceitos essenciais na exploração do espaço geográfico. Em relação ao tema relevo, existem dificuldades dos alunos em perceberem as formas de relevo representadas através de recursos como fotografias, perfil e mapas topográficos. O bloco-diagrama é um dos recursos utilizados na representação do relevo nos livros didáticos de Geografia. Esta pesquisa procura refletir sobre a questão: quais são as contribuições da utilização do bloco-diagrama na representação do relevo no ensino de Geografia? Os procedimentos metodológicos estão referenciados na abordagem qualitativa. Como instrumento de coleta de dados utilizou-se a técnica de grupo focal. Os procedimentos metodológicos envolveram: (i) análise de livros didáticos de Geografia de Ensino Fundamental (5ª a 8ª série) quanto à representação gráfica do relevo; (ii) realização de uma atividade em sala de aula, a fim de observar como os alunos do 1º ano do Ensino Médio utilizam o bloco-diagrama na resolução da atividade e (iii) realização da técnica de grupo focal para verificar se o bloco-diagrama contribuiu de alguma forma para a construção das respostas que os alunos apresentaram à atividade proposta. Essa pesquisa permitiu identificar que o relevo é apresentado aos alunos através do livro didático a partir dos textos como suporte básico, cujos conceitos são ilustrados por representações gráficas. As análises mostraram a riqueza quantitativa dos livros didáticos de Ensino Fundamental com relação aos recursos de representação do relevo. A atividade desenvolvida permitiu inferir que os alunos do universo pesquisado não têm familiaridade com tais representações; os alunos têm pouco conhecimento sobre as formas de relevo e, ainda apresentam deficiências quanto á linguagem escrita e verbal. Aponta-se que a representação gráfica deve ser utilizada para entender os conceitos e não apenas ser uma imagem ilustrativa; as representações gráficas devem estar associadas aos conceitos ao longo do texto; o professor deve aproveitar as qualidades e deficiências do livro didático em benefício do ensino e deve basear seu enfoque na gênese das formas de relevo e nos processos condicionantes. Ao se abordar o relevo, deve-se enfatizar não o conteúdo pelo conteúdo, mas ensinar a pensar e a ler a realidade do espaço geográfico através dos conteúdos.
25
Smetana, Štěpán. "Bezpečnost obráběcích strojů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241835.
Full textAbstract:
This Master’s thesis concerns about the safety of machinery, in the literary research part you can find information about the law system and requirements of European Union and Czech Republic. There is a description of the legal enactments, which the manufacturers of machinery needs to follow. Second part of this thesis is about the safety of a milling center. The milling center is analyzed here, you can find here the description of its components. The milling center was then described with the help of block diagrams. For each component from the block diagram you can find here a list of dangerous situations which can occur and also a list of safety precautions for each situation. Based on these information the list of requirements for the milling center was made.
26
Andrade, Fabrício Luís de. "Movimento de blocos rochosos: um estudo acerca do risco e sua percepção no Morro do Cristo em Juiz de Fora-MG." Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/308.
Full textAbstract:
Submitted by Renata Lopes (renatasil82@gmail.com) on 2015-12-17T19:47:15Z
No. of bitstreams: 1
fabricioluisdeandrade.pdf: 7057434 bytes, checksum: a55af7d732de984b9bfdfca483496632 (MD5)Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-01-25T15:12:38Z (GMT) No. of bitstreams: 1 fabricioluisdeandrade.pdf: 7057434 bytes, checksum: a55af7d732de984b9bfdfca483496632 (MD5)
Made available in DSpace on 2016-01-25T15:12:38Z (GMT). No. of bitstreams: 1 fabricioluisdeandrade.pdf: 7057434 bytes, checksum: a55af7d732de984b9bfdfca483496632 (MD5) Previous issue date: 2015-08-04
FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Esta pesquisa teve como objetivo identificar e detalhar pontos com risco para movimentos de massa - na tipologia movimento de blocos rochosos - na área tombada do Morro do Cristo em Juiz de Fora, MG, bem como a percepção deste risco por parte da população residente nas áreas consideradas mais vulneráveis junto ao sopé da mesma. O estudo foi desenvolvido na porção compreendida pelo polígono estabelecido pelas ruas Espírito Santo e São Sebastião, sentido N-S e pela vertente tombada do Morro do Cristo e a Av. Olegário Maciel, sentido WE. O estudo foi dividido em quatro etapas: na primeira etapa buscou-se identificar e avaliar a estabilidade dos blocos de rocha com dimensões iguais ou superiores a 100x100x100cm. Para tanto, foi utilizada a ficha de avaliação de estabilidade de blocos rochosos (BRASIL, 2011). Na segunda etapa identificou-se as tipologias dos movimentos dos blocos classificados como instáveis e muito instáveis (INFANTI e FORNASARI, 1998). Na terceira etapa verificou-se a percepção de risco que os moradores das áreas mais vulneráveis possuem, por meio de entrevistas semi-estruturadas, que foram transcritas e tiveram seu conteúdo analisado conforme Bardin (1977). Na quarta e última etapa foram elaboradas uma árvore de falhas e um diagrama de causa e consequência (ROCHA, 2005). Um total de trinta (30) blocos foram identificados e avaliados, sendo que destes, três (3) se encontravam instáveis e dez (10) muito instáveis. As quedas e rolamentos mostraram-se como os movimentos comuns no local. Os resultados das entrevistas revelaram uma baixa percepção do risco por parte dos moradores. Consequências naturais e/ou antrópicas são as causas possíveis para as quedas e/ou rolamentos de blocos de rocha. As medidas para a redução da instabilidade dos blocos de rocha e conseqüente redução do risco no local consistem em intervenções de responsabilidade do poder público. A partir desses dados é possível apontar a condição de alto risco para movimento de blocos de rocha na área de estudo.
This research had as its objective to identify and detail risky points for mass movements – in the rock block movement typology – in the protected area of Morro do Cristo in Juiz de Fora, MG, as well as the perception of this risk by part of the population residing in the areas considered to be more vulnerable by its foothills. The study was developed in the part surrounded by the polygon made by the streets Espírito Santo and São Sebastião, running N-S and by the protected slope of Morro do Cristo and Av. Olegário Maciel, running W-E. the study was divided in four stages: on the first stage we sought to identify and evaluate the stability of the rock blocks with dimensions of or above 100x100x100cm. For that we used the rock block stabilization evaluation form (BRASIL, 2011). On the second stage we identified the movement typology of the blocks classified as unstable and very unstable (INFANTI and FORNASARI, 1998). On the third stage we elaborated a tree of faults and a diagram of cause and effect (ROCHA, 2005). On the fourth and last stage we verified the perception of risk that the residents of the more vulnerable areas suffer by means of semistructured interview, which were transcribed and had their content analyzed according to Bardin (1977). A total of thirty (30) were identified and evaluated, out of them, three (3) were found unstable and ten (10) very unstable. The falls and rolls presented themselves as common movements in the place. The results of the interviews revealed a low perception of risk by part of the residents. Natural and/or man-made consequences are the possible causes for the falls and/or rolls of rock blocks. The measures for the reduction of the instability of the rock blocks and consequent reduction of risk in the place are interventions liable to the public authorities. From this data it is possible to point out a high-risk condition for the rock block movements in the studied area.
27
Saeed, Umar, and Ansur Mahmood Amjad. "ISTQB : Black Box testing Strategies used in Financial Industry for Functional testing." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3237.
Full textAbstract:
Black box testing techniques are important to test the functionality of the system without knowing its inner detail which makes sure correct, consistent, complete and accurate behavior or function of a system. Black box testing strategies are used to test logical, data or behavioral dependencies, to generate test data and quality of test cases which have potential to guess more defects. Black box testing strategies play pivotal role to detect possible defects in system and can help in successful completion of system according to functionality. The studies of five companies regarding important black box testing strategies are presented in this thesis. This study explores the black box testing techniques which are present in literature and practiced in industry as well. Interview studies are conducted in companies of Pakistan providing solutions to finance industry, which is an attempt to find the usage of these techniques. The advantages and disadvantages of identified Black box testing strategies are discussed, along with it; the comparison of different techniques with respect to most defect guessing, dependencies, sophistication, effort, and cost is presented as well.
28
Kadeřábek, Jan. "Generátor biologických průběhů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218661.
Full textAbstract:
This semestral thesis describes signal EKG, it’s origin, evaluation and device for his generation. After identification with standard course of EKG signal, was such as signal created in program language Matlab. It’s consisting of 10 sinus courses, where each of them has it’s own frequence, start phase and amplitude. Each of this part of EKG signal is beat frequence variant. Rates of it’s durations and sizes were fixed from medicin literature. Such as created program were rewritten to program language C and is basic of main program, which control signal processor. Finally was propoused preparation, which will be generated this signal. Outcome of this thesis is teoretic treatise about signal EKG, created program for generation of this course include part control and machine doing realization of biological courses.
29
Vaško, Pavel. "Panelový měřicí přístroj." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219011.
Full textAbstract:
The master thesis includes a literature search, which is focused on questions around panel measure instruments for measuring analog voltage signals. There is the block diagram and the concept of measuring voltage values designed from collected information and defined requirements to the device. In the next step a design of the circuit diagram is created and published and consequently transferred into PCB. The whole board has been fabricated, assembled and tested. The firmware development starts with the definition of basic functional blocks for using of internal elements of the device, which is followed by the implementation of the Modbus slave station service routine. The top part presents graphical user interface on the device.
30
Bergström, Joakim, and Hampus Nilsson-Sundén. "Cost effective optimization of system safety and reliability." Thesis, Linköpings universitet, Fysik och elektroteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119950.
Full textAbstract:
A method able to analyze and optimize subsystems could be useful to reduce project cost, increase subsystem reliability, improve overall aircraft safety and reduce subsystem weight. The earlier the optimization of development of an aircraft in the design phase can be performed, the better the yield of the optimization becomes. This master thesis was formed in order to construct an automatic analysis method, implementing a Matlab script, evaluating devices forming aircraft subsystems using a Genetic Algorithm. In addition to aircraft subsystems, the method constructed in the work is compatible with systems of various industries with minor modifications of the script.
31
Jair, Cavalcante de Figueirêdo José. "Análise de dependabilidade de sistemas data center baseada em índices de importância." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/2733.
Full textAbstract:
Made available in DSpace on 2014-06-12T16:00:41Z (GMT). No. of bitstreams: 2
arquivo6891_1.pdf: 3592402 bytes, checksum: ef946f0de5820fb05efe2612994a5ced (MD5)
license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5)
Previous issue date: 2011Nos dias atuais, questões relacionadas `a dependabilidade, como alta disponibilidade e alta confiabilidade estão cada vez mais em foco, principalmente devido aos serviços baseados na internet, que normalmente requerem operação ininterrupta dos serviços. Para melhorar os sistemas (arquiteturas de data center, por exemplo), deve ser realizada análise de dependabilidade. As atividades de melhoria normalmente envolvem redundância de componentes o que exige ainda, análise dos componentes. A fim de obter os valores de dependabilidade, além de entender as funcionalidades dos componentes, é importante quantificar a importância de cada componente para o sistema, além da relação entre dependabilidade e custos. Neste contexto, é importante o auxílio de ferramentas que automatizem atividades do projeto, reduzindo o tempo para se obter os resultados, quando comparados ao processo manual. Este trabalho propõe novos índices para quantificar a importância de componentes, relacionando custos, que podem auxiliar projetistas de data center. Adicionalmente, extensões para a ferramenta ASTRO (núcleo Mercury) foram implementadas e representam um dos resultados deste trabalho. Estas extensões incluem avaliação de importância de componentes, avaliação de dependabilidade por limites e geração das funções lógica e estrutural. Além disso, foram implementadas melhorias no módulo de Diagramas de Blocos para Confiabilidade (RBD). Mercury permite a análise de dependabilidade através de Redes de Petri Estocásticas (SPN) e RBD. Ainda considerando a ferramenta ASTRO, é possível quantificar o impacto na sustentabilidade de infraestruturas de data center. Todas as métricas implementadas foram avaliadas em arquiteturas de data center, embora não sejam limitadas a estas estruturas, podendo ser utilizadas para avaliar sistemas em geral. Para demonstrar a aplicabilidade deste trabalho foram gerados três estudos de caso
32
Silva, Bruno. "ASTRO- uma ferramenta para avaliação de dependabilidade e sustentabilidade em sistemas data center." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/2199.
Full textAbstract:
Made available in DSpace on 2014-06-12T15:55:22Z (GMT). No. of bitstreams: 2
arquivo2234_1.pdf: 7802626 bytes, checksum: 1cb84477d378fe2e57a785c1609ceac9 (MD5)
license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5)
Previous issue date: 2011Conselho Nacional de Desenvolvimento Científico e Tecnológico
Aspectos de sustentabilidade têm recebido grande atenção pela comunidade científica, devido às preocupações com a satisfação das necessidades atuais de energia sem comprometer, por exemplo, recursos não-renováveis para as gerações futuras. Na verdade, uma crescente demanda de energia é uma questão que tem impactado a forma de como os sistemas são concebidos (data centers, por exemplo), no sentido de que os projetistas necessitam verificar vários trade-offs e selecionar uma solução viável considerando a utilização da energia e outras métricas, tais como confiabilidade e dispobilidadade. As ferramentas são importantes neste contexto para automatizar várias atividades de projeto e obter resultados o mais rápido possível. Este trabalho apresenta um ambiente integrado, denominado, ASTRO, que contempla: (i) Diagramas de Blocos de Confiabilidade (RBD) e Redes de Petri Estocásticas (SPN) para avaliação de dependabilidade , (ii) um método baseado na avaliação do ciclo de vida (LCA) para a quantificação do impacto da sustentabilidade. ASTRO foi concebido para avaliar infra-estruturas de centros de dados, mas o ambiente é genérico o suficiente para avaliar sistemas em geral. Além disso, um estudo de caso é fornecido para demonstrar a viabilidade do ambiente proposto
33
Svíčková, Jitka. "Bezpečnost nástrojové brusky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382474.
Full textAbstract:
The Master´s thesis concerns about the safety of tool grinder, and in the research part deals with the legislative requirements of the European Union and the Czech Republic. The basic legal provisions governing machinery manufacturers are described and analyzed here. The second part deals with the safety of tool grinder, risk analysis and proposal of preventive measures for risk reduction. The tool grinder is analyzed here and the results are summarized in the block diagram is drawn. Moreover, there are identified potential hazards for individual parts and the appropriate safety requirements are construed.
34
Cavalcanti, Victor Antônio Ribeiro de Lira. "Uma abordagem para mapeamento de redes virtuais confiáveis." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/11836.
Full textAbstract:
Submitted by Luiz Felipe Barbosa (luiz.fbabreu2@ufpe.br) on 2015-03-10T19:35:09Z
No. of bitstreams: 2
license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)
DISSERTAÇÃO Victor Antônio Ribeiro de Lira Cavalcanti.pdf: 3376876 bytes, checksum: f248afb33bde4460b94c42271f85e3c8 (MD5)Approved for entry into archive by Daniella Sodre (daniella.sodre@ufpe.br) on 2015-03-10T19:42:47Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTAÇÃO Victor Antônio Ribeiro de Lira Cavalcanti.pdf: 3376876 bytes, checksum: f248afb33bde4460b94c42271f85e3c8 (MD5)
Made available in DSpace on 2015-03-10T19:42:47Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTAÇÃO Victor Antônio Ribeiro de Lira Cavalcanti.pdf: 3376876 bytes, checksum: f248afb33bde4460b94c42271f85e3c8 (MD5) Previous issue date: 2014-04-29
A Internet possui um papel vital na sociedade atual, possibilitando a existência de aplicações e serviços em diferentes áreas, como saúde, entretenimento, educação e segurança. Entretanto, apesar da Internet ter evoluído consideravelmente em aspectos como velocidade e capacidade, inovações arquiteturais necessárias, por exemplo, para melhor suporte à mobilidade, sofrem resistência em virtude de sua estrutura atual. Nesse contexto, a virtualização de redes de computadores é uma abordagem promissora para resolver o problema atual de ossificação da Internet. Um grande desafio associado a esse conceito é o mapeamento das redes virtuais, devido à natureza NP-difícil do problema. Com isso, diversas heurísticas têm sido propostas com o objetivo de alcançar alocações eficientes. Contudo, apesar de as abordagens existentes aperfeiçoarem métricas de desempenho, como o custo e a taxa de aceitação das requisições, questões de dependabilidade não são consideradas no mapeamento. Dependabilidade envolve métricas como confiabilidade e disponibilidade, as quais impactam diretamente a qualidade do serviço. Logo, tais métricas são de grande importância e devem ser consideradas na formulação de problemas de otimização para alocação de redes virtuais. Este trabalho propõe um algoritmo baseado na metaheurística GRASP (Greedy Randomized Adaptive Search Procedure) para o mapeamento de redes virtuais confiáveis. Políticas de redundância são consideradas na alocação para satisfazer requisições de redes virtuais com restrições de alta disponibilidade. Além disso, é proposta uma abordagem hierárquica e heterogênea, com modelos formais em redes de Petri estocásticas (SPN) e diagramas de bloco de confiabilidade (RBD) para representar e avaliar disponibilidade das redes virtuais. Esses modelos são gerados e avaliados automaticamente pela ferramenta Mercury, ao longo do processo de mapeamento. Estudos de caso são propostos para demonstrar a aplicabilidade dos modelos e algoritmo adotados. Os resultados experimentais demonstram o impacto da adoção de questões de dependabilidade na alocação, bem como a relação entre a disponibilidade e o custo das redes virtuais.
35
Bartoš, Michal. "Audiovizuální stimulátor." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218774.
Full textAbstract:
The main objective of this study is to learn about the audiovisual stimulator and to create hardware resolution of stimulation LED glasses and in environment of the program LabView application, which operate this stimulation LED glasses and in the same time create sound of stimulation. Use environment of the program LabView. Application, which is create in environment of the program LabView, enable operate stimulation LED glasses and arrange sound from three source with two different method, which use modern AVS. Application contains a lot of security, informative and agreement components.
36
Štěrba, Václav. "Návrh 10-ti kanálového equalizeru s optimalizací kmitočtové charakteristiky a spektrálním audio-analyzátorem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219896.
Full textAbstract:
This work deals with the design of a 10-zones equalizer with optimized frequency characteristics with a spectrum audio analyzer. In this work the problem of processing audio signals using equalization for filtering the interference frequencies, correction of frequency cover signal boost or suppression of the required zones of the audible spectrum are also analyzed. The influence of subjective perception of sound intensity of the audio signals reproduction and its use in working with equalizer is discussed too. The work describes the principles and usage of the audio-analyzer as a tool for the optimization of the audio equalization setting when ensuring the appropriate listening conditions of music reproduction, spoken word, sounds, etc. It also focuses on the signal source for testing audio-chains, their generation and measurement using the audio analyzer. The equalizer equipment, audio-analyzer generator of reference signals equipment and power supply are designed as a single unit.
37
Melo, Alexsandro Marques de. "Avaliação de Performabilidade de Riscos de Desenvolvimento em Projetos de Software." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/10468.
Full textAbstract:
Submitted by Lucelia Lucena (lucelia.lucena@ufpe.br) on 2015-03-04T18:17:55Z
No. of bitstreams: 2
DISSERTAÇÃO Alexsandro Marques de Melo.pdf: 2019685 bytes, checksum: 1f13a5d938c44e305924468b5f47d963 (MD5)
license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)Made available in DSpace on 2015-03-04T18:17:55Z (GMT). No. of bitstreams: 2 DISSERTAÇÃO Alexsandro Marques de Melo.pdf: 2019685 bytes, checksum: 1f13a5d938c44e305924468b5f47d963 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2014-02-27
Falhas em projetos é um fator de destaque na abordagem feita pela comunidade de engenharia de software e muito tem sido feito em prol do sucesso desses projetos, porém, os riscos sempre existirão. O aumento das taxas de sucesso em projetos de software representa um desafio significativo para essa indústria, em que alguns riscos (por exemplo, atrasos no cronograma, aumento de custos) podem levar os projetos ao fracasso. Nesse contexto, a área de gerência de riscos tem uma importância significativa. No entanto, a falta de um processo de gerenciamento de riscos, aliada a estimativas deficientes de custo e de tempo, são algumas das principais causas das falhas dos projetos de desenvolvimento de software. O gerenciamento de riscos contribui positivamente para a redução e controle dos riscos do projeto de software, através de sua identificação e quantificação. Foram propostas várias técnicas para avaliar os efeitos de tais problemas indesejáveis, mas estimativas de probabilidade são geralmente negligenciadas, e isso afeta uma avaliação adequada dos riscos. Por isso, o impacto de riscos no desempenho de um projeto de software é um aspecto importante que não deve ser desprezado. Este trabalho propõe uma metodologia e modelos de dependabilidade e performabilidade para avaliação probabilística de riscos de desenvolvimento em projetos de software. Nesta metodologia, a avaliação de riscos é realizada utilizando diagramas de blocos de confiabilidade e redes de Petri estocásticas. Dois estudos de caso demonstram a viabilidade da técnica proposta. Com a aplicação da metodologia e dos modelos propostos, é possível verificar o impacto e avaliar a performabilidade dos riscos de desenvolvimento em projetos de software. Além disso, essa metodologia possibilitará a avaliação de outros riscos de desenvolvimento, bem como a avaliação de performabilidade em outras etapas do processo de desenvolvimento de software. Isso tudo pode ser utilizado pelos gerentes de projetos de software para avaliar o impacto dos riscos em diferentes projetos.
38
Ferrier, Lydie. "Micro-nano structures à base de cristaux photoniques pour le contrôle 3D de la lumière." Phd thesis, Ecole Centrale de Lyon, 2008. http://tel.archives-ouvertes.fr/tel-00625602.
Full textAbstract:
Le contrôle 3D de la lumière est réalisé, à l'échelle de la longueur d'onde, dans des circuits photoniques intégrés. La brique élémentaire choisie dans cette étude est le cristal photonique (CP) membranaire qui, par ses propriétés de dispersion, permet un contrôle de la lumière à la fois dans le plan (optique guidée) et hors du plan (dispositifs adressables par la surface). En particulier, l'exploitation de modes de Bloch situés au point Gamma de la courbe de dispersion (k//=0) permet l'émission de la lumière dans la direction verticale. Dans cette étude, nous nous sommes focalisés sur des cristaux photoniques à réseaux de micropiliers, comme alternative aux réseaux de trous, mais également en envisageant la possibilité d'intégrer ces structures dans des systèmes microfluidiques, les fluides ayant la capacité de circuler au travers des réseaux de piliers. Nous décrirons dans une première partie, des dispositifs à CP à émission par la surface. Nous démontrerons, pour la première fois, que l'utilisation de modes fortement résonants permet de réaliser des microlasers à réseaux de piliers en InP. Les modes faiblement résonants peuvent être utilisés pour la réalisation de miroirs à CP et de microcavités Fabry-Pérot constituées uniquement de tels miroirs. Les facteurs de qualité obtenus (>10000) rendent possible la fabrication de nouveaux types de VCSEL. Dans une seconde partie, nous nous intéresserons à la problématique de l'intégration de ces dispositifs dans un circuit photonique 3D. Tout d'abord, nous expliquerons comment il est possible d'optimisation le diagramme de rayonnement des composants. Ensuite, nous étudierons le couplage de dispositifs à cristaux photoniques avec un ou deux guides d'onde ruban en silicium. De fortes efficacités de couplage sont obtenues en simulation FDTD 3D (95%). Ces dispositifs en cours de fabrication en collaboration avec le LETI-CEA de Grenoble permettront de démontrer expérimentalement ce couplage.
39
Thies, Philipp Rudolf. "Advancing reliability information for Wave Energy Converters." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/4053.
Full textAbstract:
Marine renewable energy promises to provide a significant contribution to the future electricity supply. It is estimated that 17% of today's UK electricity demand could be generated from wave and tidal sources. The ambition to harvest this resource is in the public interest, as it eases the pressures on energy security, holds the potential to reduce carbon emissions and has the prospect to create a new UK industry sector worth £15 billion. From an engineering perspective, marine energy is one of the least developed renewable energy technologies and has to be regarded as unproven. The reliability of components and devices in the harsh marine environment is one of the main engineering challenges. Reliability assessments and the assurance of acceptable reliability levels are dependant on the adequacy of failure information, which is scantily available for marine energy. This thesis shows that large failure rate uncertainties impede the reliability assessment for wave energy converters and how a suite of experimental, numerical and statistical methods can be applied to improve scarcely available reliability information. The analysis of component load conditions identifies fatigue as failure mode of concern and the fatigue life of mooring lines and marine power cables is quantified in a floating wave energy application. A Bayesian statistical approach and dedicated service-simulation component testing is proposed, and implemented to improve the quality of reliability estimates and to provide relevant data and assurance. The methods presented, along with the results, will assist reliability assessment and design during early development stages, and will inform the prediction of maintenance requirements during operation. Reliable marine energy systems will be the technical enabler for the successful transition of prototype devices to a commercially viable marine energy industry.
40
Kobza, Jaromír. "Měření přijímače pro pozemní digitální televizi DVB-T." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218626.
Full textAbstract:
This thesis is focused on a receiver for digital television broadcasting set-top box, mainly on its features, parameters and measurement. The important point of this work is the possibility to analyze and visualize the parallel transport stream in the same time and the solution of this problem. The principle of tuner and its measuring is deeply discussed. The text is supported with oscilloscope screenshots in particular parts of decoding stream. The set-top box is modified for laboratory measurement purpose and the transport stream output is added. An example laboratory exercise was created as a part of this work.
41
Hundák, Vladimír. "Algoritmy pro řízení asynchronního motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220893.
Full textAbstract:
Hlavným cieľom tejto práce je vytvorenie simulácií rôznych algoritmov riadenia asynchrónneho motora a vzájomné porovnanie ich vlastností. Zaoberá sa taktiež možnosťami konfigurácie náhradného zapojenia na T-článok, -článok a -článok. Obsahuje jednak teoretický rozbor, a taktiež aj simulácie jednotlivých spôsobov riadenia spolu s podrobným návodom na ich realizáciu. Celkovo budú vykonané 3 simulácie – simulácia vektorového riadenia s orientáciou na rotorový tok, vektorového riadenia s orientáciou na statorový tok a simulácia takzvaného prirodzeného riadenia. Ide o úplne nový typ riadenia, ktorého autorom je vedúci tejto diplomovej práce. Jeho simulácia bola vôbec prvým pokusom o funkčnú realizáciu tohto typu riadenia.
42
Imaev, Aleksey A. "Hierarchical Modeling of Manufacturing Systems Using Max-Plus Algebra." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1257871858.
Full text
43
Čech, Ondřej. "Vliv namáhání alkalických akumulátorů na jejich parametry." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217856.
Full textAbstract:
This master's thesis deals with alkaline battery characteristics and it has special consideration of nickel-cadmium cells. There are three main experimental parts in this paper. First one is concerned with positive electrode materials properties and is aimed to investigate impact of magnesium ions formed into nickel hydroxide electrode structure. Second part deals with battery charging/discharging and response measurement tool design. National Instruments hardware PXI modules for data acquisition was used and program in LabView environment was made. Last one is concerned with nickel-cadmium cell properties changes during increased temperature stressing. Investigation of cell self-charge changes during lithium hydroxide addition into electrolyte was made.
44
Drábek, Ivo. "Energetický zdroj se spalovací turbinou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230039.
Full textAbstract:
The goal of this master´s thesis is designing power plant with gas turbine of 50 MWe power output for the site. It includes appropriete choose of gas turbine and its simplified termodynamic calculation, designing the thermal diagram and its calculation, for the parameters complying with nominal temperature of outside air, layout design, annual energy and mass flow results, savings of combined heat and power, intended at this application and economic evaluation of investment.
45
Šoupal, Ondřej. "Programování mikrokontrolérů c2000 v programu MATLAB/Simulink." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413221.
Full textAbstract:
The aim of this thesis is to explore possibilities of rapid control prototyping, describe the concept of creating the software application in MATLAB/Simulink environment with use for development kit Texas instruments LaunchPad and create an application for DC and induction motor control in this environment. This work describes the application for unipolar/bipolar control H-Bridge of power converter for DC motor, measurement of output currents, speed and its displaying in real time using serial control interface. This thesis also desribes scalar and vector control of induction motor. All software applications with measurements are created in MATLAB/Simulink and attached to the thesis.
46
McLucas, Alan Charles Civil Engineering Australian Defence Force Academy UNSW. "An investigation into the integration of qualitative and quantitative techniques for addressing systemic complexity in the context of organisational strategic decision-making." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Civil Engineering, 2001. http://handle.unsw.edu.au/1959.4/38744.
Full textAbstract:
System dynamics modelling has been used for around 40 years to address complex, systemic, dynamic problems, those often described as wicked. But, system dynamics modelling is not an exact science and arguments about the most suitable techniques to use in which circumstances, continues. The nature of these wicked problems is investigated through a series of case studies where poor situational awareness among stakeholders was identified. This was found to be an underlying cause for management failure, suggesting need for better ways of recognising and managing wicked problem situations. Human cognition is considered both as a limitation and enabler to decision-making in wicked problem environments. Naturalistic and deliberate decision-making are reviewed. The thesis identifies the need for integration of qualitative and quantitative techniques. Case study results and a review of the literature led to identification of a set of principles of method to be applied in an integrated framework, the aim being to develop an improved way of addressing wicked problems. These principles were applied to a series of cases in an action research setting. However, organisational and political barriers were encountered. This limited the exploitation and investigation of cases to varying degrees. In response to a need identified in the literature review and the case studies, a tool is designed to facilitate analysis of multi-factorial, non-linear causality. This unique tool and its use to assist in problem conceptualisation, and as an aid to testing alternate strategies, are demonstrated. Further investigation is needed in relation to the veracity of combining causal influences using this tool and system dynamics, broadly. System dynamics modelling was found to have utility needed to support analysis of wicked problems. However, failure in a particular modelling project occurred when it was found necessary to rely on human judgement in estimating values to be input into the models. This was found to be problematic and unacceptably risky for sponsors of the modelling effort. Finally, this work has also identified that further study is required into: the use of human judgement in decision-making and the validity of system dynamics models that rely on the quantification of human judgement.
47
Vondruš, Jiří. "Návrh a konstrukce modelu automatické galvanizační linky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217635.
Full textAbstract:
This thesis deals with the design of automated system of electroplating. The first part is centered on designing the technological process for this electroplating and the setout of operating vats. It also deals with the project of mechanical construction, electrical system, with the computing procedure and the optimum choice of gear for galvanic line model. The work includes the design of a DC motor controller, the computing procedure and the construction of heating element for vats heater simulation. The last part of this thesis offers an insight to the control system and the assembled program. In the addendum, the photo of the realized model, the wiring scheme, and the programme transcript for control galvanic line model can be found.
48
Chvátal, Michal. "Řízení dodávky vody v rodinném domě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442453.
Full textAbstract:
The diploma thesis deals with the design and implementation of the system that will control the water supply for the family house and its garden. The system aslo allows you to store a history that can be viewed via the web interface. The web interface also allows you to set system parameters and monitor the current status.
49
Sheng, Huey-Ming, and 盛惠銘. "A study of national security decision-making by system block diagram." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/75884304687889648534.
Full text
50
YAN, LIU GUANG, and 劉光硯. "Implementation of Digital control Variable Gain Amplifier using Feedback Block Diagram." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/20033866785725962660.
Full textAbstract:
碩士中華大學
電機工程學系碩士班
102
This thesis design a Digital control Variable Gain Amplifier be based on the CMOS current mirror and improve the linear gain by using the feedback and Pade approximation. Finally, we use HSPICE and MATLAB for circuit simulation and analysis. Circuit layout is used the Laker which provided by CIC. The chip is fabricated by TSMC 0.18μm CMOS process. In this thesis, the simulated result is based on the input range of -10μA to 10μA, the power supply of 1.8V, the linear gain range is 53dB and 63dB, the linear error within ±1dB and ±1.5dB, the bandwidth is 137MHz to 865MHz and 122MHz to 918MHz, the power consumption is from 4.4mW to 5.6mW and the area of chip is 0.432*0.432(mm2).