Within the last decade, e-commerce has increased at an extraordinary level. The widespread use of Unmanned Aerial Vehicles (VAVs) in the logistics sector can reduce traffic density, improve delivery time, and can prov...
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Long-wave radiation heat transfer is calculated using a geometrical factor the so-called view factor, which is normally estimated in a simplified way by building simulation programs, especially when there is no inform...
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Long-wave radiation heat transfer is calculated using a geometrical factor the so-called view factor, which is normally estimated in a simplified way by building simulation programs, especially when there is no information in the literature due to the complexities to solve the double integral which defines the view factor between two surfaces. Analytical solutions are only available in the literature for a restricted number of simple configurations. This simplification on the process may implicate several errors on the evaluation of the internal surface temperatures which can cause discrepancies on the prediction of thermal comfort level and energy consumption, mainly when surfaces present complex geometries, openings (windows and doors) and when there are obstructions between them. In this way, the objective of this work is to present a computational method to determine the view factor between two surfaces considering simple or complex geometries with openings and obstructions, using an algorithm to generate a finiteelement mesh onto surfaces to distinguish viewed/shaded surface areas. The algorithm is fast, memory-efficient, robust and uses constrained and unconstrained Delaunay triangulations. The mesh quality is guaranteed by the use of the Rupert's Delaunay refinement algorithm that avoids undesirable small triangle angles. A comparison with literature data available only for the case of simple configurations (without openings and obstructions) shows the excellent accuracy of the proposed computational method. For those cases, a sensitivity analysis consisting in varying the mesh refinement and the distance between the two surfaces has been performed. The results obtained for some geometries considering openings and obstructions are also presented.
This paper describes the participation of the PISIS team in the authorship identification track of PAN'11. We adopted two different strategies for the tasks of authorship attribution and authorship verification. F...
This paper describes the participation of the PISIS team in the authorship identification track of PAN'11. We adopted two different strategies for the tasks of authorship attribution and authorship verification. For authorship attribution we performed experiments with a document occurrence representation using a standard classification-based approach. Results obtained with this approach were mixed: in the small data sets distributional representations resulted very helpful, although in the large data sets a simple bag-of-words approach outperformed the document occurrence approach. For authorship verification we adopted a classification-based approach and proposed a modification to Ensemble Particle Swarm Model Selection (EPSMS) for selecting classification models for each task. This approach obtained acceptable performance in two out of the three data sets.
This paper is concerned with the mixed 2/ ∞ control problem combined with robust pole placement in linear matrix inequality (LMI) regions. Continuous-time linear systems subject to polytopic parametric uncertainties ...
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Traffic flow characterization is critical for transportation systems and urban infrastructure planning. In most major cities in Latin America, this characterization is carried out visually by a group of observers duri...
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Traffic flow characterization is critical for transportation systems and urban infrastructure planning. In most major cities in Latin America, this characterization is carried out visually by a group of observers during one-hour sampling periods. Automating this process should result in higher consistency and reliability in the output statistics, as well as helping keep the people in charge of this process safe. In this project, an automatic vehicle counting and classification system prototype is presented. The system uses video images previously recorded thru a camcorder and, upon an initial setup session, proves capable of detecting, counting and classifying the passing vehicles to an acceptable error rate. The preliminary evaluation is promising and provides a solid base for the development of the complete system.
Document clustering has been used as a core technique in managing vast amount of data and providing needed information. In on-line environments, generally new information gains more interests than old one. Traditional...
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The use of instant messaging (IM) application is very communal among smartphone users, as it delivers ease in interaction and communication. The speed at which technologies, growth, and expansion of networks infrastru...
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Global competitiveness has challenged manufacturing industry to rationalize different ways of bringing to the market new products in a short lead-time with competitive prices, high quality, and customization. Modern P...
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The purpose of this article is to analyze and describe sustainable practices based on biodiversity assets adopted by one of the largest global cosmetics company, located in Brazil. The company occupies the 19th positi...
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A pickup and delivery vehicle routing problem from a real-world bottled-beverage distribution company is addressed. The problem consists of deciding how to load every trailer, how to configure the vehicles in terms of...
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