Épsilon

15

Authors: Fabián Augusto Lamus Báez, Sofía Andrade Pardo, Nancy Torres Castellanos

One of the limitations structural engineers face when designing a building and, in general, any structure in Guadua angustifolia Kunth is the lack of technical information related to the parameters needed for a proper numerical model of the same. The degree of embedding that can provide support to its structural element is an important variable during structural modeling, because the judgment of the engineer in the selection of this parameter for modeling can influence the rigidity of the structure and, therefore, its period of vibration. This paper presents the experimental results of the constant of rigidity of a connection between a Guadua angustifolia Kunth column and a concrete element that is part of the foundation, when the column is under monotonic lateral loads. Additionally, the impact of each component of the connection on the rigidity of the structure has been evaluated.

18

Authors: Guillermo Armando Briceño Vanegas

In 2010, we carried out a comprehensive ecological characterization of landscape units present at the San José de Matadepantano Ranch, in the Casanare foothills. Landscape units were divided into natural and cultural. Natural units were classified into five categories: savannah, flooded savanna and marsh, gallery forest, palm field, and relict forest. Cultural units were classified into four categories: changes in land area, vector changes, low impact constructions, and constructions with high impact. All units were mapped based on aerial photography, and coverage area was calculated by analyzing the dynamic trends of each. Natural landscape units with more coverage area were savannah and gallery forest, while the construction of the university campus of the Utopia project constituted the major cultural transformation of the land. In regional context, gallery forest showed a high degree of structural continuity and ecological integrity, compared to the surrounding farms, although with some sections affected by anthropogenic disturbances. The two main water currents running through the farm, the brooks named Tiestal and Güio, does not appear to have disturbances that jeopardize their ecological integrity, but it is necessary to await the outcome of detailed ecological surveys, currently under the way, to confirm the findings of this comprehensive study.

21

Authors: Nathaly Murcia Sepúlveda, Jenny Andrea Suárez Barbosa, Salvador Pacheco, Jaime G. Barrero Pérez

This paper presents the design and implementation of two adaptive filters (Wiener filter and LMS [least mean square] filter), in order to remove unwanted signals in a desired or reference signal. These adaptive filters were programmed in the PSoCTM (programmable system on chip) development system; and a virtual generator was developed by the LabView™ computational tool. The data generated were used as inputs to the filter system and formed the basis of the process carried out. Similarly, the article describes the tests and the analysis of each filter type under different noise conditions for a final comparison of the results

25

Authors: Diana Milena Díaz Hernández, Andrés José Alfaro Castillo

This paper presents seismic hazard maps of Colombia for a return period of 475 years. These maps are evaluated with probabilistic seismic hazard methodology, with a seismic catalog for 1960-2012, for which five equations of the 2008 Next Generation Attenuation Relation Project (NGA) were used. The NGA equations generate results with large variations, despite using the same relation scheme and the same PEER database, which was filtered depending on the criteria of each group. Additionally, standard deviations play an important role in the evaluation, because, in some cases, the value exceeds the average. Although we did not perform an analysis of completeness, the values obtained for the cities of Cali, Ibagué, Medellín, Pasto, Pereira, Popayán and Quibdó are greater than the current seismic standard.

28

Authors: Diana Jimena López, Juan Martín Velasco, Óscar Amaury Rojas

The Enterprise Actor Model (MADE) is the product of five years of research by the research group in development in Industrial Automation at the University of Cauca, Colombia. It is a model of enterprise integration developed specifically for production-sector businesses. It aims to represent the structure, behavior, organization and integration of the components of a production business, while establishing the information that flows among them. Achieving a successful application of this model to a particular production business would become a major contribution to the field of automation and enterprise integration. A series of works has developed around MADE that gradually allowed to add new features, definitions and concepts; however, the degree of formalization required to initiate the process of developing a methodology for implementation has not yet been achieved. This article focuses on formalizing the existing components of the Enterprise Actor Model which results in three basic elements of MADE: entities, nomenclature of entities, and models.