Revista Visión Electrónica: algo más que un estado sólido

5-13

Authors: Juan Carlos Martínez Quintero, José de Jesús Rugeles Uribe, Edith Paola Estupiñan Cuesta

This paper evidence a channels use analysis and the spectral occupancy measurement for the downlink in Bogota, Colombia, over GSM-850 band. Two test scenarios are defined. First, we select a path of 2.96 Km over North Zone Bogotá to realize the channels search and spectrum detection. The results show parameters like: BSIC, NCC, LAI, MNC, LAC, CI, BCCH channel, uplink frequency, power level received for a mobile telephony operator. Rohde & Schwarz Qualipoc was used to perform the measurements. The Qualipoc equipment found a coverage of 17 cells on the path with a reconnection state in two cells previously identified. After the analysis, we concluded that the GMSK modulation is the most used, reporting stable power level for mobile stations as specified in 3GPP GSM05.05 statement. Finally, the spectrogram measurement indicated the coexistence of different mobile technologies, and the GSM use in several frequency channels and temporal spaces, with 95.2% spectrum occupancy.

22-31

Authors: Sebastián Gael Moctezuma Gutiérrez, Arturo Cruz Pazarán, Rubén Galicia Mejía, Luz Noé Oliva Moreno

Collaborative robots have such a big interest in control, manipulation and programmed tasks areas; part of the functionality can be found in the communication platform between them. In this research article presents the development of a platform of collaborative robots using programmable logic devices such as a Complex Programmable Logic Device (CPLD), ultrasonic sensors, and infrared sensors with the objective of executing various tasks. Depending on how the robots are programmed, those platforms can give support to many companies facing difficulties, such as the high prices of the conventional platforms. Also, they can facilitate daily work like moving objects from one place to another.

43-50

Authors: Andrés Felipe Calvo Salcedo, Arley Bejarano Martínez, Andrés Castillo González

The wireless sensor network is an innovative technology that has had great impacts in the field of engineering and in recent years has allowed technological developments focused on precision agriculture. This paper presents the results research lead to design a network of low cost wireless multisensors for the recording and monitoring of the state variables of a crop using Beaglebone Black development cards integrating with sensors of temperature, relative humidity, soil moisture and cameras Digital images. The acquired information is transmitted with wireless local area network (WLAN) communication protocol to a central server allowing to obtain a registry and control in a database, created in MYSQL with Linux base operating system. The results of this work show the reliability and energy consumption of the equipment.

58-64

Authors: Jonathan Roberto Torres Castillo, Juan Salvador Pérez Lomelí, Esperanza Camargo Casallas, Miguel Ángel Padilla Castañeda

This article describes the research that leads to the development of a wireless haptic device capable of generating vibrotractile mechanical stimuli at different points in the human skin and at desired frequencies by means of 16 actuators contained in portable bracelet isolated, designed for any extremity of the human. This prototype allows control over each actuator used as a test point, independently driven by commands transmitted wirelessly to a self-contained rechargeable control system placed on the bracelet. The completion and use of this system allowed to perform usability tests with respect to tactile perception from three experiments in healthy people, who verified the efficiency of the vibrotactile flux in the discrimination of nearby stimuli and the correct functioning of the device. With the development of this device want to perform it a wide variety of validation tests with a large sample of patients with and without neuropathies, in order to create a database to be used as set values against these patients and it is expected that the system is also used in patients with movement deficit, using tactile perception as a psychomotor stimulant in the execution of motor activities.

73-82

Authors: Wilson Enríquez, Paola Nazate, Omar Marcillo

The guideline of the present project is to create a seismic digitizer. In order to be used as a seismic field station, the digitizer should be compact, reliable and flexible to adapt at field seismic station. The objective was achieved using the Spartan-6 LX45 FPGA as the basis for the embedded continuous data acquisition system with a configurable speed up to 50 Ksps. The prototype comes equipped with Ethernet communication, 12 channels with 24-bit ADC resolution expandable up to 24 channels, data storage writable to both USB and SD, a user-friendly interface, LCD information indicator and time synchronization to UTC by external GPS. As a result of the present project, an embedded electronic device was obtained that can be utilized diverse seismic applications such as monitoring, refraction or reflection and for use in sensor arrays appropriate for volcanic applications. The prototype is compatible with visualization and seismic data management software.

89-96

Authors: Cristian Camilo Córdoba Poveda, David Alejandro Barbosa Cortes, Dora Lilia Castañeda Tibaquirá

Is presented the development of a telemetry system for the measurement of depressions and elevations in a vacant lot, implemented in an unmanned aerial vehicle (UAV) in order to obtain information that allows to know the height of the Soil Elevation or depression) with their respective geographical position. The information captured by said system is stored in SD Card memory and once it has been transmitted wirelessly, so that it can be used by the user and thus it is possible to identify the characteristics of the height of the ground relevant for what they are not Disadvantages in the future.

102-109

Authors: Luis David Cardona Calderón, Mario Javier Moreno Rincón, Luis Enrique González Olarte, Jonathan Gallego Londoño

This paper describes a prototype of a circuit with a radio-frequency identifier (RFID) intended to help blind people, to allow this social group to obtain general and specific information about a near object using audio feedback. On this implemented prototype there were used components like a board, speakers, power setup for the speaker, a memory module, radio-frequency identifiers, transponders and an Atmel AtMega328 microcontroller (Arduino). The device successfully works allowing the user to identify several objects. The wearable will device within a glove which will allow coupling the designed device with the clothe. The actual state of this prototype is the base for a final model which is going to have a power supply (lithium battery), a microUSB input for data actualization and battery charge, and a 3.5 mm minijack input for headphones, making it completely portable, personalized and internet-free

115-123

Authors: Carolina Montaño, Nicolás Rodríguez, Luz Helena Camargo

The behavior and characteristics of blood in the circulatory system have generated various models that can be applied to the flow analysis blood, including Newtonian and non- Newtonian models. This review presents eleven models proposed from experimental parameters, which include studies of viscosity with different speeds of shear and density associated with fluid dynamics. Were characterized in accordance with methods, specific parameters, used experimental values. Comparing efficiency, certainty and precision of the models used.

132-135

Authors: Rosendo López González

The development of scientific thought do not stop. In this essay we take as a starting point the classical Greece with the contributions of Aristotle and his difficulties to give the empirical evidence a theoretical construction; thus, Plato’s disciple in the renowned book Metaphysics records the basis of a science of the general. This new model of knowledge is taken in the twelfth century by the Christian West, where it is dogmatized and Thomas Aquinas in the 13th century managed to consummate a symbiosis between Aristotelian thought and Christian faith. In response to this association, renaissance humanism builds another model of scientific knowledge; In this paper, Galileo’s contribution is known as the paduana methodology. It was developed at the University of Pauda where Galileo was a physics teacher between 1592 and 1610.