Pena J.E.A.,Autonomous University of Colombia |
Bustamante R.A.G.,Autonomous University of Colombia
LAMC 2016 - IEEE MTT-S Latin America Microwave Conference | Year: 2016
This paper has to purpose to present an correlation analysis between propagation models used for the design of an DVB-T2 network using ICS Telecom software design in an urban scenario of the city of Bogota (Colombia). A comparison of empirical propagation models and deterministic propagation models is performed using the results of simulations and field measurements (drive test) to establish the performance of each of the propagation models in the study area. Correlation results showed that empirical and semiempirical models present slightly better performance that deterministic models. © 2016 IEEE.
Arias L.A.,Autonomous University of Colombia |
Rivas E.,University of Caldas |
Leon L.M.,University of Caldas
Informacion Tecnologica | Year: 2017
In this article, a management model for electricity distribution networks is proposed. The electricity distribution network includes elements of distributed generation (DG). The network monitoring is done through Phasor measurement units (PMU). The concepts of PMU, DG, management models for networks and Unified modeling language UML are analyzed. The UML language is used as the basis for modeling process management system proposed. Later, stages of modeling, structural elements and functionalities of the proposed model management system are illustrated. It is concluded that being model of open and generic design it can be easily include new parameters, or change de direction of the network elements, 0r new control strategies that may be needed to fulfill a desired management task.
Neira-Garcia A.M.,University of Los Andes, Colombia |
Martinez-Reina A.M.,Autonomous University of Colombia |
Orduz-Rodriguez J.O.,National University of Colombia
Corpoica Ciencia y Tecnologia Agropecuaria | Year: 2016
In this work the behavior of the price of two varieties of pineapple Gold and wholesalers Perolera two plants in Colombia is analyzed. The techniques used were the cointegration and Granger causality test, for which prices were taken pineapple, in the period 2006-2011 of wholesale markets Corabastos (in the case of Bogotá) and the Central Wholesale Itagui (for Medellin). The theoretical framework was the law of one price. The work proved that there is market integration in the process of price formation. The results allow us to see that there is independence between the prices of the two markets. Cointegration tests indicate that the series are cointegrated itself, so that in the absence of external shocks, the series converge in the long term. We conclude that, although there is no causal link between the markets, these are themselves integrated in the long run, evidencing a fulfillment of the law of one price. The study does not include an analysis of the distances between production areas and consumption centers to consider the effect of transport costs when setting the price. Future research could consider such variables as quality and consumer preferences. © 2016 Corporación Colombiana de Investigación Agropecuaria.
Yepez J.G.V.,Autonomous University of Colombia |
Moreno A.Y.,New York Institute of Technology |
Prada S.R.,Autonomous University of Colombia
2016 IEEE Colombian Conference on Robotics and Automation, CCRA 2016 - Conference Proceedings | Year: 2016
The possibility of more intuitive human-machine interfaces has sparked the development of new visual technologies. The way humans interact with elements of their environment should not be limited to the screens of phones or computers. Other alternatives where a sensation of spatial freedom are under development. Projection systems, using continuous light on surrounding surfaces, represent a major area of exploration. The great level of development in artificial vision hardware and software tools enables the acquisition of data from the user and his/her environment, while in the background, a software can analyze in real time the variations of the scene without intervention of the user. This kind of data processing makes possible the integration between what the user is doing and seeing. The device proposed in this paper uses an arrangement of infrared sensors that capture the hand gestures from the user, and then points towards a projection surface in the user workspace. A gesture recognition software platform recreates the 3D environment of the user and analyzes the motion of the key points of the user hands. After obtaining these data, a process of comparison with previously established patterns determines if the user is performing some kind of preset command with his hands. If so, the system immediately converts this signal into a command that will be executed with the assistance of an Arduino platform. The embedded platform carries out a previously established protocol, in which, by making use of a mechatronic system of 2 degrees of freedom that supports a micro projector, it allows the user to adjust the position of the projected image over a surface, allowing the user to use a 360° virtual space. The main goal of this system is to generate an interface where the gestures of the hands of the user not only allow him/her to interact with software-level elements, but also with mechatronic components that may be physically present such as robots or home automation devices. Once the robotic assistant system proposed is in operation, its user will not have to refer to a physical screen to enter control commands; instead of that, a robotic assistant system, with more intuitive and natural motions, will facilitate the realization of the user commands. © 2016 IEEE.
Moreno R.J.,Autonomous University of Colombia
2014 3rd International Congress of Engineering Mechatronics and Automation, CIIMA 2014 - Conference Proceedings | Year: 2014
This paper presents the implementation of an autonomous mobile robot which is capable of avoiding obstacles while it moves by means of an ultrasonic detection system and aims to find human faces. In a disaster such as a landslide or earthquake, where is possible that the initial condition of danger persists as would be the case of an earthquake, in which within a building, beams and parts of the structure remain committed, as well as the people who risk their lives finding victims. In response, the designed robot provides a solution by using artificial intelligence algorithms and image processing running on embedded systems. The obtained results allow the robot to move autonomously avoiding obstacles and stopping when it finds a human face. © 2014 IEEE.
Moreno R.J.,Autonomous University of Colombia
2014 19th Symposium on Image, Signal Processing and Artificial Vision, STSIVA 2014 | Year: 2015
This article presents the development of machine vision algorithms that allows to manipulate two robotic arms by the operator, replicating the movements of his own arms, accomplishing control of four degrees of freedom per arm. The development is aimed to provide an environment of natural, wireless and non-invasive control, providing security to the operator in the face of achievement of unsafe tasks, either for removal of hazardous, explosive or radioactive materials, as well as possibly toxic environments or just remote control from a remote site. The tracking algorithm of the two arms is based on their detection using the skeleton tool of Microsoft Kinect sensor, as well as image processing algorithms like color space conversion, segmentation and thresholding to control the gripper arm. It was possible to obtain real-time control of the arms to four degrees of freedom, according to the monitoring of the arms of the operator in the ranges of sensor coverage. © 2014 IEEE.
Aquino-Santos R.,University of Colima |
Martinez-Castro D.,Autonomous University of Colombia |
Edwards-Block A.,University of Colima |
Murillo-Piedrahita A.F.,Autonomous University of Colombia
Sensors (Switzerland) | Year: 2013
This paper introduces wireless sensor networks for Ambient Assisted Living as a proof of concept. Our workgroup has developed an arrhythmia detection algorithm that we evaluate in a closed space using a wireless sensor network to relay the information collected to where the information can be registered, monitored and analyzed to support medical decisions by healthcare providers. The prototype we developed is then evaluated using the TelosB platform. The proposed architecture considers very specific restrictions regarding the use of wireless sensor networks in clinical situations. The seamless integration of the system architecture enables both mobile node and network configuration, thus providing the versatile and robust characteristics necessary for real-time applications in medical situations. Likewise, this system architecture efficiently permits the different components of our proposed platform to interact efficiently within the parameters of this study. © 2013 by the authors; licensee MDPI, Basel, Switzerland.
Pena J.E.A.,Autonomous University of Colombia
2016 IEEE International Engineering Summit, IE-Summit 2016 | Year: 2016
This paper has to purpose to present an analysis of correlation between propagation models used for the design of an LTE-A network using the design networks tool ICS Telecom in an urban scenario of the city of Bogota (Colombia). A comparison of empirical propagation models and deterministic propagation models is performed using the results of simulations and field measurements (drive test) to establish the performance of each of the propagation models in the study area. Analysis of correlation results showed that geometrical models present better performance that empirical models. © 2016 IEEE.
Valencia J.H.A.,Autonomous University of Colombia |
Pena J.E.A.,Autonomous University of Colombia
2014 IEEE Colombian Conference on Communications and Computing, COLCOM 2014 - Conference Proceedings | Year: 2014
This paper takes a brief description of a series of radio propagation simulation of MIMO (Multiple Input Multiple Output) multiantenna systems in the areas of La Candelaria and La Castellana in Bogota DC (Colombia), using specialized software ICS Designer and digital high resolution cartography. A comparison between the types of multiantenna systems MU-MIMO (Multi User MIMO), SU-MIMO-SD (Single User MIMO Spatial Diversity), SU-MIMO-SM (Single User MIMO Spatial Multiplexing) and standard antennas is performed. The results allow to characterize these considerations have multiantenna systems used by the LTE (Long Term Evolution) technology adopted in Colombia by operators such as mobile telecommunications system fourth generation (4G). © 2014 IEEE.
Garcia-Perdomo H.A.,Autonomous University of Colombia |
de la Hoz G.E.,Free University of Colombia
Urologia Colombiana | Year: 2016
Purpose: To determine the effectiveness of using a pedagogic strategy based on information and communications technology (ICT) on the meaningful learning of urological concepts in medical students. Methods: This was a mixed research (quantitative and qualitative). A pedagogic strategy based on ICT was implemented. The students were divided into two groups, the experimental group received the ICT based strategy, and the control group the conventional activities. The learning focus and their basic knowledge were assessed at the beginning and at the end of the meaningful learning. A checklist, a portfolio, a questionnaire and a semi-structured interview were used. Stata 13 and Dedoose were used for the statistical analysis. Results: No differences were found between the type of learning focus and the meaningful learning of the students. There was an appropriate knowledge in some specific urological topics, an adequate topic discussion and development of the duties. Important elements were also found in the learning process to discuss and gather knowledge in order to interact with patients. Conclusions: There is no evidence that using a pedagogic strategy based on ICT is more effective than using the conventional strategy to improve meaningful learning by medical Students. © 2016 Sociedad Colombiana de Urología.