Extraction of topological structures in 2D and 3D vector fields

feature extraction, feature tracking, vector field visualization

Wideband impedance spectrum analyzer with arbitry fine frequency resolution for in situ sensor applications

Magdeburg, Univ., Fak. für Elektrotechnik und Informationstechnik, Diss., 2009

Network Meta-analysis to Synthesize Evidence for Decision Making in Cardiovascular Research

Abstract Clinical decision-making requires synthesis of evidence from literature reviews focused on a specific theme. Evidence synthesis is performed with qualitative assessments and systematic reviews of randomized clinical trials, typically covering statistical pooling with pairwise meta-analyses. These methods include adjusted indirect comparison meta-analysis, network meta-analysis, and mixed-treatment comparison. These tools allow synthesis of evidence and comparison of effectiveness in cardiovascular research.

Molecular mechanisms of classical fear conditioning : GABAergic factors and their role in fear-related network activities

Magdeburg, Univ., Fak. für Naturwiss., Diss., 2010

Programmierschnittstellen für eingebettete Netzwerke in Mehrbenutzerbetriebssystemen am Beispiel des Controller Area Network

Magdeburg, Univ., Fak. für Informatik, Diss., 2011

Lagrangian methods for visualization and analysis of time-dependent vector fields

Magdeburg, Univ., Fak. für Informatik, Diss., 2013

Shapes in vector fields : methods for continuous deformations and surface-based flow visualizations

Magdeburg, Univ., Fak. für Informatik, Diss., 2013

Advanced production systems : developing context-oriented method and adaptation capabilities for enhanced supply network

Magdeburg, Univ., Fak. für Maschinenbau, Diss., 2014

A Wireless Mesh Network NS-3 Simulation Model: Implementation and Performance Comparison With a Real Test-Bed

Wireless mesh networks present an attractive communication solution for various research and industrial projects. However, in many cases, the appropriate preliminary calculations which allow predicting the network behavior have to be made before the actual deployment. For such purposes, network simulation environments emulating the real network operation are often used. Within this paper, a behavior comparison of real wireless mesh network (based on 802.11s amendment) and the simulated one has been performed. The main objective of this work is to measure performance parameters of a real 802.11s wireless mesh network (average UDP throughput and average one-way delay) and compare the derived results with characteristics of a simulated wireless mesh network created with the NS-3 network simulation tool. Then, the results from both networks are compared and the corresponding conclusion is made. The corresponding results were derived from simulation model and real-worldtest-bed, showing that the behavior of both networks is similar. It confirms that the NS-3 simulation model is accurate and can be used in further research studies.

power network concept : a theoretical and empirical approach to strategy in the global network economy

Magdeburg, Univ., Fak. für Wirtschaftswiss., Diss., 2014

Topology of vector fields with uncertainty

Magdeburg, Univ., Fak. für Informatik, Diss., 2015

Sôbre o Trypanosoma conorrhini, hemoparasito do rato transmitido pelo Triatoma rubrofasciata: presença do vector infectado na cidade do Rio de Janeiro

Os autores, após historiar a desccberta do Trypanosoma conorrhini (DONOVAN, 1909) (sinonimia Crithidia conorrhini DONOVAN, 1909, Trypanosoma boy lei LAFONT, 1912) no inseto transmissor e no hospedeiro vertebrado, o Rattus rattus diardi, fazem um estudo sumário do seu vector intermediário, o barbeiro cosmopolita Triatoma rubrofasciata (DE GEER, 1773) . Em seguida, referem a captura, no centro da cidade do Rio de Janeiro, Brasil, de um exemplar adulto dêste barbeiro parasitado por flagelados que foram identificados ao Trypanosoma conorrhini, fato êste pela primeira vez verificado no Novo Mundo. Certas formas evolutivas dêste parasito no inseto são muito semelhantes às do Schizotrypanum cruzi, mas os tripanosomas metacíclicos apresentam alguns caractéres morfológicos que permitem seu reconhecimento: os mais notáveis são o pequeno tamanho e a colocação do núcleo muito para trás, bem junto ao blefaroplasto. São dadas as medidas de 100 tripanosomas metaciclicos do T. conorrhini e de Schizotrypanum, cujo comprimento total médio foi, respectivamente, 13.88 u e 19.85 u. Nas seguintes espécies de barbeiro foi facilmente obtida a evolução do Trypanosoma conorrhini: Triatoma infestans, Triatoma vitticeps, Rhodnius prolixus e Panstrongylus megistus. Por inoculação de triatomas infectados foi obtida a transmissão do T. conorrhini ao camondongo branco, ao rato e ao macaco rhesus. As infecções foram muito fracas, custando-se a ver o tripanosoma no sangue, a fresco. Em gotas espêssas êle é encontrado com mais facilidade, mas o método de escôlha para verificação da sua presença no sangue dos animais é o xenodiagnóstico. Nesta prova o Triatoma infestans foi empregado com os resultados mais favoráveis. Por êste processo foi observada a infecção inaparente de um camondongo até 53 dias depois da inoculação. A forma sanguícola do T. conorrhini é um tripanosoma ttpico, de grande dimensões (40-60u), de extremidade posterior muito alongada e pontuda, membrana ondulante ampla e com largas pregas, blefaroplasto subcentral; em muitos indivíduos é notável uma estrutura particular, junto e à frente do blefaroplasto. Poucas horas depois de inoculados com as dejeções, os flagelados passam para a circulação, transformando-se em 3-4 dias nos grandes tripanosomas que acabam de ser descritos. O número de parasitos depende do número de flagelados inoculados. Não se conhece o processo de multiplicação do T. conorrhini no vertebrado, nunca tendo sido observados tripanosomas em via de divisão no sangue nem formas proliferativas nos tecidos. As sub-inoculações (de animal a animal) em geral não passam da primeira (MORISHITA, 1935). Tentativas até agora realizadas por outros pesquisadores no sentido de cultivar o T. conorrhini a partir do sangue de animais infectados, têm sido negativas. Por enquanto as pesquisas tendentes a determinar o hospedeiro vertebrado do parasito no Rio de Janeiro limitam-se a aplicação do xenodiagnós-tico em cinco ratos do Morro de Santo Antônio, cujo resultado...

The Barcelonnettes: an example of network-entrepreneurs in XIX century Mexico. An explanation based on a theory of bounded rational choice with social embeddedness

A theory of network-entrepreneurs or "spin-off system" is presented in this paper for the creation of firms based on the community’s social governance. It is argued that firm’s capacity for accumulation depends on the presence of employees belonging to the same social/ethnic group with expectations of "inheriting" the firm and becoming entrepreneurs once they have been selected for their merits and loyalty towards their patrons. Such accumulation is possible because of the credibility of the patrons’ promises of supporting newcomers due to high social cohesion and specific social norms prevailing in the community. This theory is exemplified through the case of the Barcelonnettes, a group of immigrants from the Alps in the South of France (Provence) who came to Mexico in the XIX Century.

Mixed Hodge structures and vector bundles on the projective Plane I

We describe an equivalence of categories between the category of mixed Hodge structures and a category of vector bundles on the toric complex projective plane which verify some semistability condition. We then apply this correspondence to define an invariant which generalises the notion of R-split mixed Hodge structure and compute extensions in the category of mixed Hodge structures in terms of extensions of the corresponding vector bundles. We also give a relative version of this correspondence and apply it to define stratifications of the bases of the variations of mixed Hodge structure.

Repeated games played in a network

Delayed perfect monitoring in an infinitely repeated discounted game is modelled by letting the players form a connected and undirected network. Players observe their immediate neighbors' behavior only, but communicate over time the repeated game's history truthfully throughout the network. The Folk Theorem extends to this setup, although for a range of discount factors strictly below 1, the set of sequential equilibria and the corresponding payoff set may be reduced. A general class of games is analyzed without imposing restrictions on the dimensionality of the payoff space. This and the bilateral communication structure allow for limited results under strategic communication only. As a by-product this model produces a network result; namely, the level of cooperation in this setup depends on the network's diameter, and not on its clustering coefficient as in other models.