Spatial Constraint
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Synthesis of Sparse Arrays Based On CIGA (Convex Improved Genetic Algorithm)
Abstract In this paper, a novel hybrid algorithm on beam pattern synthesis of sparse arrays is proposed, which aims at minimizing the peak sidelobe level (PSLL). Sparse arrays can provide higher spatial resolution and relatively lower sidelobe than general arrays, but it is necessary to solve the multi-constraint problem of nonconvex nonlinear. Thus, we prop
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-12
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2. Control of rapid and accurate movements aimed to spatial targets / Controle de movimentos rápidos e precisos direcionados a alvos espaciais
Neste estudo foi analisado o efeito de distância, velocidade, tamanhos do disco e do alvo, e massas do disco e da manopla, sobre o desempenho motor em movimentos requisitando rapidez e precisão. Para tanto, foram analisadas as características cinemáticas da tarefa de projetar um disco a um alvo com movimento de contato balístico, empunhando uma manopla.
Publicado em: 2009
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3. Agendamento otimizado das atividades de colheita de madeira em plantios de eucaliptos sob restrições operacionais, espaciais e de risco climático / Optimized harvest scheduling in eucalyptus plantations under operational, spatial and climatic risk constraints
Sustainability concerns in forest-based industries, as related to environmental, social and economic aspects, have been highlighted with crescent realism. Therefore, forest management plans must consider a greater level of details when analyzing and understanding the interaction among these aspects to prevent possible future impacts. At the tactical and oper
Publicado em: 2009
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4. Extrapolação espectral na restauração de imagens tridimensionais de microscopia ótica de fluorescência
The study of living cells, isolated or in tissues, in several applications, requires the use of microscopy techniques. The fluorescence microscopes are specially important for making possible images with enhancement of specific structures and detection of biological processes. However, microscopes, like other optical systems, corrupt images so that many deta
Publicado em: 2008
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5. Modelagem de restrições de integridade espaciais em aplicações de rede através do modelo UML-GeoFrame / Modeling spatial integrity constraints for network applications using the UML-GeoFrame data model
Este trabalho está situado na área de sistemas de informação geográfica, especificamente abordando a modelagem de bancos de dados geográficos em domínios em que são fundamentais as informações referentes à conectividade de seus elementos. É tratada também a especificação de restrições de integridade sobre os elementos de uma rede, pois acred
Publicado em: 2008
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6. Intrahippocampal Wortmannin Infusion Enhances Long-Term Spatial and Contextual Memories
The transition from short- to long-term memory involves several biochemical cascades, some of which act in an antagonistic manner. Post-training intrahippocampal administration of wortmannin, a pharmacological inhibitor of phosphatidylinositol 3-kinase, had no effect on memory tested 3 h later, but improved long-term memory tested 48 h following the completi
Cold Spring Harbor Laboratory Press.
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7. A principle for the formation of the spatial structure of cortical feature maps.
Orientation-selective cells in the striate cortex of higher animals are organized as a hierarchical topographic map of two stimulus features: (i) position in visual space and (ii) orientation. We show that the observed structure of the topographic map can arise from a principle of continuous mapping. For the realization of this principle we use a mathematica
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8. Parallel evolution of chimeric fusion genes
To understand how novel functions arise, we must identify common patterns and mechanisms shaping the evolution of new genes. Here, we take advantage of data from three Drosophila genes, jingwei, Adh-Finnegan, and Adh-Twain, to find evolutionary patterns and mechanisms governing the evolution of new genes. All three of these genes are independently derived fr
National Academy of Sciences.
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9. Sequence requirements of the Epstein-Barr virus latent origin of DNA replication.
The Epstein-Barr virus (EBV) latent origin of DNA replication (oriP) is composed of two elements that contain binding sites for the sole viral gene product required for latent cycle replication, EBNA-1. One of these elements, region I, functions as an EBNA-1-dependent enhancer for RNA polymerase II-transcribed genes, may play a role in plasmid segregation, a
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10. Pavlovian Pattern Learning by Nonlinear Neural Networks
This note describes laws for the anatomy, potentials, spiking rules, and transmitters of some networks of formal neurons that enable them to learn spatial patterns by Pavlovian conditioning. Applications to spacetime pattern learning and operant conditioning are then possible, if the conditioning is viewed as multi-channel Pavlovian conditioning in a highly
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11. Cooperative binding of Ets-1 and core binding factor to DNA.
Two phorbol ester-inducible elements (beta E2 and beta E3) within the human T-cell receptor beta gene enhancer each contain consensus binding sites for the Ets and core binding factor (CBF) transcription factor families. Recombinant Ets-1 and purified CBF bound individually to beta E2 and beta E3, in which the Ets and core sites are directly adjacent. In thi
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12. Cellular epigenetics: topochronology of progressive "spontaneous" transformation of cells under growth constraint.
Early passages of NIH 3T3 cells yield about 10 transformed foci for every 10(5) cells seeded after the cells multiply to confluence in a standardized 2-week assay. The question arose whether more cells would give rise to foci if given more time for their development. This question could not be answered simply by extending the incubation period, since the ori