Examinando por Materia "Defects"

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    Ítem
    Standardizing System of Posthandover Defects for the Construction Sector in Colombia
    (American Society of Civil Engineers, 2019-01-01) Vásquez-Hernández A.; Fernando Botero Botero L.; Universidad EAFIT. Departamento de Ingeniería Civil; Gestión de la Construcción
    Posthandover defects present in the construction industry lead to reprocesses, cost overruns, and situations of dissatisfaction for purchasers. The analysis of past experiences through a feedback process with a view to continuous improvement reduces the occurrence of defects and increases control over the consequences. However, the data on the present defects are difficult to obtain and poorly structured due to the lack of uniformity in the classification systems of posthandover defects used by the construction companies; thus, their systematization and analysis is difficult. The present study examines the development of a system to classify posthandover defects for the construction sector in Colombia and its application for validation through a case study that integrates 14,772 posthandover defects from 125 projects for 19 construction companies in Colombia. © 2019 American Society of Civil Engineers.
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    Ítem
    Vision 3-D with images 2-D, by mediate the analysis of shades for the illumination angle with the surface
    (SPIE-INT SOC OPTICAL ENGINEERING, 2001-08-14) Diaz, AG; Universidad EAFIT. Departamento de Ingeniería de Producción; Ingeniería, Energía, Exergía y Sostenibilidad (IEXS)
    This paper deals with the presentation of an algorithm for acquisition and processing of images, in order to obtain information of topologic aspects in a 3D surface, starting from 2D images, by means of the analysis of the shine of the risings of the surface, when this is illuminated by light sources in oblique direction. In the surface, some areas of shine appear corresponding to the areas of the rising surfaces with slopes in front of the illumination source, and shade areas corresponding to the sinking of the surfaces. When obtaining several images of the same area, by illuminating the opposite sides and by realizing operations with them, it is obtained information on the geometry and situation of the relief elements, like elevations and depths of the surface. On this basis a novel algorithm has been developed for the detection of the situations and characteristics of the threads in structures of plane textures, in the process of detection of textile shortcomings.