Evolution of the concepts and paradigms that guide the environmental management; what are their limitations in the glocal context?
Juan Pablo Martínez Idrobo, Apolinar Figueroa Casas
In this article was made an analysis of the chronological evolution of different paradigms and concepts related to the environmental management (EM). the review highlights those that have impacts on the guidance of the EM in the country and the concept of associated development, as well as the considered approaches and dimensions for establishing the relations between them. Although the environmental management is one of the public functions shared with the society, the implemented model of EM has been unidirectional and this limited the interinstitutional interaction with the communities and the interdisciplinary relations. If this situation have a glocal-logic point of view in different ecosystems and regions, the predominance of the economic growth approach is evident with a low interaction between know-how and knowledge, that circumstance restrict the construction of sustainable management alternatives and generate environmental actions isolated. Key words: management, ecosystems, environment, paradigm. Key words: management, ecosystems, environment, paradigm.
Total Organic Carbon (TOC) flow in an andean watershed: Las Piedras River sub-watershed case
María Cristina Ordóñez Díaz, Isabel Bravo Realpe, Apolinar Figueroa Casas
The study was conducted in order to calculate the flow of carbon carried by the Las Piedras river watershed, typical and representative of the South American tropical Andes, strategic reservoir of the hydrological resource. An observational research was performed over 20 months on the hydrological resource by means of a completely random design, stratified by altitude (masl), analyzing the TOC content, the physicochemical properties of the water and hydro-meteorological variables (discharge and seasonal variation). The average concentration of TOC mainly contributed from the high zone was 9 mg.L-1. A TOC flow of 2003.5 Kg.day-1 associated with the discharge and the humid seasonality is carried in average. The analysis related to physicochemical variables allows concluding that the river dissolves CO2 in its waters. This study supplements the behavioral analysis of the Andean rivers and their contribution to the global carbon cycle.
Comparative analysis of continuous simulation hydrological models in high-mountain watersheds: Chinchiná River case
Olga Lucía Ocampo, Jorge Julián Vélez
Hydrological modelling is the basis for the comprehensive management of hydrological resources, and in the case of high-mountain watersheds, it involves a complex physicochemical process interaction. This study, conducted in the Chinchiná river watershed (Colombia), poses a multimodel analysis in order to capture the uncertainty associated with the hydrological modelling by means of seven hydrological models, continuous simulation rain-runoff, monthly-scale aggregates, with different complexity levels. The capability to reflect the hydrological response was analyzed through graphical and statistical methods. The results exhibited in the statistical indicators, the hydrographs, and the discharge duration curves allow a better compression of the runoff in high-mountain watersheds. The Tetis and abcd concept models, as well as the ARMA (1,1) Salas & Smith auto-regressive model, satisfactorily captured the mean discharge, and they could be applied for the estimation in non-appraised watersheds in the zone of the study
Identification of chemical hazards in supply watersheds as an instrument for risk evaluation
Karen Zabala Alejandra Bueno, Andrea Pérez Vidal, Patricia Torres Lozada
Supply watersheds are the first and foremost barrier of the potable water supply systems (PWSS) and, therefore, the identification of hazards is a key instrument for supporting the evaluation and management of risks that could compromise the quality of potable water. The chemical hazards of the upper watershed of the Cauca river (Colombia) were identified in this study, taking as a basis the construction of prioritization matrices and the characterization of water and sediments. According to the uses of the soil, five priority substances and fourteen pesticides that need to be controlled were identified. The characterization of the chemical hazards in water and sediments exhibited the presence of several heavy metals and substances of sanitary interest that could represent health risks if the PWSS supplied by this source in the evaluated section do not have adequate treatment barriers.
Electricity contract price prediction using genetic programming with functional blocks
Carlos A Martínez, Juan D Velásquez
The prediction of the prices of the contracts in non-regulated electric energy markets is the key for the market agents to make strategic business and operational decisions. The average prices of the contracts sold in the Colombian electric energy market are predicted in this study by means of a modified genetic programming algorithm. The developed model is capable of capturing the intrinsic dynamics of the prices and the price predictions for the upcoming months with a more accurate precision than the ARIMA and DAN2 models for prediction horizons of 12 and 14 months, as they have been reported in the literature.
Diffuse inference system for valuation of companies
Miguel David Rojas López, Esteban Zuluaga Laserna, Maria Elena Valencia Corrales
The objective of this research is to propose a tool based on diffuse logic that would allow its implementation in the valuation of companies, accepting the inclusion of non-quantitative variables and criteria that have not been included in said process. Initially, some of the main company valuation methodologies are explored, identifying the factors that have an impact on them. Then, they are established as supply for the tool proposed in this research work. Subsequently, the diffuse logic theoretical framework is presented, which is the basis of the mentioned tool. Then, the characteristics are established in diffuse terms of its own components, and several results are disclosed. The presented tool, apart from including qualitative variables and supporting the investment decision-making process, allows the follow-up of the management as it facilitates the measurement of the variations that some organizational decisions generate in the value of the company.
Recollection of the role of Liouville in the history of the elliptic functions
Leonardo Solanilla Chavarro, Ana Celi Tamayo Acevedo, Yefferson Palacios Mosquera
This paper collects the main conclusions of a research on the contributions of J. Liouville to the contemporary theory of the elliptic functions. It covers most of the results of a collaboration between the SUMMA group from the Universidad de Medellín Basic Sciences Department and the Mat group from the Universidad del Tolima Department of Mathematics and Statistics. The project has been partially funded by the Universidad de Medellín Research Vice-Principal’s Office and the Universidad del Tolima School of Sciences. It begins with a description of Liouville’s historic background after the emergence of the elliptic function modern concept in the work of Abel and Jacobi. Subsequently, certain details of the Leçons chaired by the famous French mathematician in 1847 are discussed. Such details cover the so-called Liouville-Borchardt theorem, the fundamental propositions about the number of zeros of the meromorphic doubly periodic functions, and the results of the relation between the zeros and the poles. The end of the article outlines important conclusions regarding the Liouville’s legacy to the current theory of the elliptic functions.
AES depth profile and photoconductive studies of AgInS2 thin films prepared by co-evaporation
C A Arredondo, C Calderón, P Bartolo Pérez, G Gordillo, E Romero
In this study, thin films of AgInS2 with chalcopyrite-type tetragonal structure were grown by means of a procedure based on the sequential evaporation of metallic precursors in presence of elemental sulfur in a two-stage process. The effect of the growth temperature and the proportion of the evaporated Ag mass in relation to the evaporated In mass (mAg/mIn) on the phase and homogeneity in the chemical composition were researched through X-ray diffraction measurements and Auger electrons spectroscopy. These measurements evidenced that the conditions for preparing thin films containing only the AgInS2 phase, grown with tetragonal chalcopyrite-type structure and good homogeneity of the chemical composition in the entire volume, are a temperature of 500 ºC and a 0.89 mAg/mIn proportion
Analysis of the social development in isolated rural areas through agent-based simulation
Yony Fernando Ceballos, Omar Baqueiro Espinosa, Isaac Dyner
The purpose of this research work is to identify the human and social development in rural areas where electric energy plays an important role in the way people make decisions, and its role in the life quality improvement, which is measured as the satisfaction of Maslow’s basic needs. The described simulation model, based on agents (ABM), jointly with the results of performed simulations allow characterizing and concluding with regard to the impact of the incorporation of electric energy in the development of a rural region. The study exhibits that communities have the capability to adapt and generate an increase in the quality of life by means of the use of electric power in the day-to-day life, allowing to show that the incorporation of electric energy in the area is a tool that enables the development of the region.
A topic modeling approach for web service annotation
Leandro Ordóñez Ante, Ruben Verborgh, Juan Carlos Corrales
The actual implementation of semantic-based mechanisms for service retrieval has been restricted, given the resource-intensive procedure involved in the formal specification of services, which generally comprises associating semantic annotations to their documentation sources. Typically, developer performs such a procedure by hand, requiring specialized knowledge on models for semantic description of services (e.g. OWL-S, WSMO, SAWSDL), as well as formal specifications of knowledge. Thus, this semantic-based service description procedure turns out to be a cumbersome and error-prone task. This paper introduces a proposal for service annotation, based on processing web service documentation for extracting information regarding its offered capabilities. By uncovering the hidden semantic structure of such information through statistical analysis techniques, we are able to associate meaningful annotations to the services operations/resources, while grouping those operations into non-exclusive semantic related categories. This research paper belongs to the TelComp 2.0 project, which Colciencas and University of Cauca founded in cooperation.
Analysis of the contextual behavior of the user and its relation with the consumption of mobile applications
Luis Antonio Rojas Potosí, Leandro Krug Wives, Alejandro Fernández, Juan Carlos Corrales
The mobile applications market is growing rapidly, capturing the attention on the analysis of the consumption of applications to improve their recommendation and the satisfaction of the user. The analysis is based on the search for information that allow explaining the occurrence of events of the life cycle of the applications. In this sense, several studies show a strong relation between such events and information about the current contextual situation of the users and their application consumption record. Nevertheless, the mentioned studies do not take into account the relation existing between the contextual dimensions status record (known as CUBe), and the occurrence of application life cycle events, but it was taken into account for this research work. Therefore, a statistical analysis about an actual dataset is presented, evidencing a strong relation between the CUBe and the launch of a set of applications. Finally, a scenario where these relations can be used for enriching recommendation systems for mobile applications is described.
Recommendations system for Digital Signage environments based on a smart tv-smartphone cooperation scheme
Francisco Martínez Pabón, Víctor Garzón Marín, Juan Camilo Ospina Quintero, Jhon Jairo Ibarra...
Advertisement in Digital Signage environments demands the enrichment of the classic approach of recommendation focused on individuals by means of the delivery of ads for a group of people observing a public screen. Even though the accuracy that can be achieved in the recommendations is important, the degree of novelty perceived by the users is even more important. This balance can be obtained not only through the improvement of the recommendation algorithms, but also through an adequate multiscreen cooperation scheme. Therefore, this paper proposes an approach for the construction of a recommendations system for Digital Signage environments based on a Smart TV-Smartphone cooperation scheme