Salesian Polytechnic University
Cuenca, Ecuador
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Inga E.,Salesian Polytechnic University | Cespedes S.,University of Chile | Hincapie R.,Pontifical Bolivarian University | Cardenas C.A.,University of Chile
IEEE Wireless Communications | Year: 2017

This article presents a scalable route map for the least cost deployment of wireless heterogeneous networks that support traffic from the advance metering infrastructure (AMI). We first explore the performance of a common scenario in which a single technology is employed to connect smart meters sending traffic to the utility. Based on simulations with actual city maps, we study the coverage provided to smart meters by an LTE cellular network. In order to improve the coverage, an optimization model that considers network capacity and range is proposed to determine the optimal location of base stations to achieve a target coverage of smart meters. According to these preliminary results with a single access technology, we propose an evolved network architecture that considers several alternatives of wireless heterogeneous networks to guarantee the coverage to smart meters with the least use of resources. We introduce a heuristic model that involves elements from base stations, universal data aggregation points, number of smart meters, and an optimal routing to achieve the desired connectivity from the group of smart meters. We employ geo-referenced models to consider actual characteristics of cities as well as geographical conditions. Results from the evolved model demonstrate that by combining technologies and employing data aggregation points with optimized localizations, the network is able to achieve a target coverage of smart meters with a reduced cost in terms of technological resources. © 2002-2012 IEEE.

Aguila A.,Salesian Polytechnic University | Wilson J.,Pontifical Bolivarian University
IOP Conference Series: Earth and Environmental Science | Year: 2017

This paper develops a methodology to assess a group of measures of electrical improvements in distribution systems, starting from the complementation of technical and economic criteria. In order to solve the problem of energy losses in distribution systems, technical and economic analysis was performed based on a mathematical model to establish a direct relationship between the energy saved by way of minimized losses and the costs of implementing the proposed measures. This paper aims at analysing the feasibility of reducing energy losses in distribution systems, by changing existing network conductors by larger crosssection conductors and distribution voltage change at higher levels. The impact of this methodology provides a highly efficient mathematical tool for analysing the feasibility of implementing improvement projects based on their costs which is a very useful tool for the distribution companies that will serve as a starting point to the analysis for this type of projects in distribution systems. © Published under licence by IOP Publishing Ltd.

Ortega-Ortega A.L.,Salesian Polytechnic University | Bravo-Torres J.F.,Salesian Polytechnic University
2017 International Conference on Electronics, Communications and Computers, CONIELECOMP 2017 | Year: 2017

In this paper we explore the advantage of combining M-QAM modulations, LDPC codes, and IFDMA multiaccess techniques in order to increase the capacity of the system, reduce the peak-to-average power ratio (PAPR) and to improve the BER performance. The simulation results show that our proposal provides better performance, even allowing significant reductions, of about 1 dB, in the PARP of the high-level modulation schemes, such as 64-QAM. In addition, the spectral efficiency and BER, using LDPC codes (FEC), provides a considerable advantage and low complexity respect to traditional systems. © 2017 IEEE.

Actually Small-World Networks is a very important topic, it is present in a lot of applications in our environment. A target of many algorithms is to establish methods to get that any node in a graph can establish a direct connection with a randomly "long-range neighbor". This work is comparative study between two algorithms that get this target (Kleinberg and Biased Selection), I demonstrate by my experiments that both get the Kleinberg's distribution. I conclude that the Kleinberg's algorithm distribution maintains a probability directly proportional to Euclidian distance, and Biased Selection, although also maintains a probability directly proportional to Euclidian distance, allows that a node can get a farther node as "long-range neighbor" more frequently.

Coccini T.,Scientific Institute of Pavia | Caloni F.,University of Milan | Ramirez Cando L.J.,Salesian Polytechnic University | De Simone U.,Scientific Institute of Pavia
Journal of Applied Toxicology | Year: 2017

Since magnetic iron oxide nanoparticles (IONP) as magnetite (Fe3O4NPs) have potential applications in life sciences, industrial fields and biomedical care, the risks for occupational, general population and patients rises correspondingly. Excessive IONP accumulation in central nervous system (CNS) cells can lead to a disruption of normal iron metabolism/homeostasis, which is a characteristic hallmark resembling that of several neurodegenerative disorders. Fe3O4NPs- versus Fe3O4 bulk-induced toxic effects have been assessed in two human CNS cells namely astrocytes (D384) and neurons (SH-SY5Y) after short-term exposure (4–24-48 h) to 1–100 μg ml−1, and long-term exposure to lower concentrations. Short-term Fe3O4NPs induced significant concentration- and time-dependent alterations of mitochondrial function in D384 (25–75% cell viability decrease): effects started at 25 μg ml−1 after 4 h, and 1 μg ml−1 after 48 h. SH-SY5Y were less susceptible: cytotoxicity occurred after 48 h only with 35–45% mortality (10–100 μg ml−1). Accordingly, a more marked intracellular iron accumulation was observed in astrocytes than neurons. Membrane integrity was unaltered in both CNS cell types. Lowering Fe3O4NP concentrations (0.05–10 μg ml−1) and prolonging the exposure time (up to 10 days), D384 toxicity was again observed (colony number decrease at ≥0.05 μg ml−1, morphology alterations and colony size reduction at ≥0.5 μg ml−1). Effects on SH-SY5Y appeared at the highest concentration only. Fe3O4 bulk was always remarkably toxic toward both cells. In summary, human cultured astrocytes were susceptible to both Fe3O4NP and bulk forms following short-term and extended exposure to low concentrations, while neurons were more resistant to NPs. Cellular iron overload may trigger adverse responses by releasing iron ions (particularly in astrocytes) thus compromising the normal functions of CNS. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd.

Pillajo C.,Salesian Polytechnic University
2013 2nd International Congress of Engineering Mechatronics and Automation, CIIMA 2013 - Conference Proceedings | Year: 2013

The proposed general the problem of optimization for motion planning of articulated SCARA robotic structures, whose trajectories are subject to constraints, the stated objective is to obtain a sequence of collision-free positions that connect an initial configuration with end using search strategies based on heuristics working space, for which we use the space of the configurations. In order to evaluate the performance of this algorithm, we generated, simulated different work environments and the subsequent display of the planned collision-free paths, applied to articulated SCARA robot. To corroborate this work later this algorithm is implemented on an FPGA allowing varying some basic features of the robot. © 2013 IEEE.

Rosero P.P.,Salesian Polytechnic University
CHILECON 2015 - 2015 IEEE Chilean Conference on Electrical, Electronics Engineering, Information and Communication Technologies, Proceedings of IEEE Chilecon 2015 | Year: 2015

This paper presents a model in distributed parameters for a drying plant of cocoa beans. The plant is composed of a combustion chamber, an air fan thrust and a drying chamber integrated by a rotating cylinder. The model was developed in the EcosimPro® platform, in wich the process of simulation, sensitivity analysis and estimation of parameters were implemented. For the optimization and validation of the model were used real plant data. This research examines a valid alternative to artificial drying of cocoa beans. © 2015 IEEE.

Ortega A.,Salesian Polytechnic University
Proceedings of the 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation, APCAP 2015 | Year: 2015

This paper presents an experimental result on the measurement of the lobular radiation pattern of directional antennas (Yagi) obtained by applying a SDR (Software Defined Radio) system for the homologation and verification of the antenna performance. The measurement depends on the energy absorbed by the antenna when it is used to received a RF signal of short wave. © 2015 IEEE.

This paper analyzes the strategies developed in three medium-sized cities of Ecuador in order to progress to the National Plan for Good Living and the change in the production model, the basic guidelines policy of the government of Rafael Correa. From an analysis that combines statistical data and previous studies with fieldwork and in depth interviews the aim of this paper is to see how evolved the economy, politics and society of the three cities in recent years. The interest of these case studies is that these cities are dependent of mining and the primary sector, which makes them archetypal examples of the primary-export model that the Correa´s government wishes to overcome. The evidence found point to an insufficient coordination between the local and national scales and a small progress of these strategies. © 2016, Universidad de Granada. All rights reserved.

Carrion D.,Salesian Polytechnic University
2013 Power Electronics and Power Quality Applications, PEPQA 2013 - Proceedings | Year: 2013

This paper presents different ways to make lighting controls, a review of the various types of luminaires, lighting control modes and equipment used for the management of residential lighting. The goal of the management of lighting will be have a reduction in energy consumption and an increase in the useful life of the luminaries. To analyze the energy consumption of dimmers for lights was used equipment for power measurements; with this data was obtained algorithms behavior of the power consumed in relation to the rates of attenuation, thereby being able to predict the energy savings according attenuation of the luminaries. Finally it was concluded that the savings in paying the electricity bill is directly proportional to the level of attenuation of the luminaries. © 2013 IEEE.

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