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Large-scale graph analysis or also called network analysis of networks is supported by different algorithms, among the most relevant are PageRank (Web page ranking), Betweenness centrality (centrality in a graph) and Community Detection, these by of their complexity and the large amount of data that process diverse applications, increasingly need to use computational resources such as processor, memory...
An introduction to the study of the behavior of the acoustic wave propagation in a homogeneous dispersive medium is presented in this work. We consider the stationary problem for a two-fluid channel waveguide. The classical normal mode theory as a solution of the scalar wave equation for an idealized stratified fluid layer lying on a semi-half space is described. Graphical solution of the stationary...
In this paper some methods of ultrasonic signals energy estimation are presented. The origin of this study is a target strength and distance estimation using air coupled ultrasound sensors applied in ie. proximity sensors. In the pulse echo mode based systems the echo detection is based on signal threshold signal estimation. The signal threshold is associated with the signal energy, what implies incorporation...
This work deals with the known problem of forecasting overall capacity and viability of a complete distribution feeder as the medium for Power Line Communication (PLC). The estimation involves previewing the input impedances and power loss for each coupling arrangement on every position pair at the feeder, calculated for frequencies between 9 kHz to 10 MHz. When we deal with PLC in primary distribution...
In this paper Barnes-Wall lattices for the K-user symmetric interference channel are considered. This paper is inspired by the work of Jafar [1], where a deterministic model is used in order to build a scheme to obtain the generalized degrees of freedom for each type of interference. The scheme uses a base Q expression to build the transmitted signals. This is an inspiration for [2] where, for some...
This study aims to understand how the fifth generation of cellular telephony will function, characterizing its strands and the necessary modifications in technology and the world scenario for its application. It will also address the importance of 5G to consolidate the concept of Internet of Things (IOT), for this we will do a study of real and hypothetical scenarios where data traffic measures will...
The concept of quality of life is used as a measure of the welfare of a society, highlighting the relationship between the environment and health, mainly associated with pollution. Hence the importance of monitoring and communicating its results, in a timely manner, to the community. But often the last part of the process fail, there is a lack of communication between data, information and community...
Hydrokinetic river (HKT) and photovoltaic (PV) panels systems are of the promising technologies to be used for remote rural electrification. In rural areas with access to water and solar resources, renewable generation is a promising option for electrification. This paper presents a study by two sizing methods for a stand-alone hybrid generation system integrating renewable energies (PV panels and...
This paper presents a method for assess the risk index in a power transformers park, risk index is a metric that allows park administrator to ensure an optimal physical asset management, allocating properly financial and human resources in operation and maintenance actions. Assessing risk index requires calculating two secondary sub-index termed failure probability and consequence factor. Those indexes...
The use of beamforming techniques in millimeter wave systems is essential for compensating for high path losses. However, directional transmission and reception caused by beamforming creates additional challenges for initial beam access. In general, conventional access methods yield prolonged association times. Hence this paper presents a novel fast access scheme based upon simultaneous multi-beam...
In this paper, an analysis of the effects of the condenser unit fouling on the performance, energy consumption a cost operation on a Split type air conditioner is presented. This was based on the fact the total heat absorbed from a space is rejected to the environment using the heat exchanger in the condenser unit. By measuring pressures, temperatures, electric current, was possible to determinate...
Frosts are one of the main risks faced by farmers during the winter and spring seasons. These events can cause significant damage to cultivations and crops. In Chile, these frosts generate significant losses in the agricultural production sector, causing crop losses of an entire year and compromising the income of the following year, especially fruit and wine growers. In this work we developed an...
Electrical sub-transmission systems must ensure the reliability of the electrical system in the event of sudden changes in voltage and current, especially when there are atmospheric discharges. This document shows the influence of high resistivity on grounding, connected to guard wires in the San Rafael — Mulaló 69 KV Subtansmision line of ELEPCO S.A. By means of a field study, there are resistivities...
The need for integration of renewable energy to the electricity grid promotes research and development of new energy storage technologies, as well as models and techniques to study them. In this sense, the present work proposes a model to evaluate the benefit that can be harnessed through energy arbitrage in function of a daily hourly rate differentiation. The Vanadium Redox Battery is one of the...
One of the most noticeable effects on the loss of performance and capacity of thermal systems is caused by the effect of altitude, which causes the density of a compressible fluid and the atmospheric pressure to be considerably reduced, leading to a reduction of power to electrical and thermal systems. In view of this, lithium-ion battery packs that have forced cooling through a compressible fluid...
This work deals with the Optical Transport Networks planning, more specifically the optical amplifiers allocation in fiber optic links. This is a critical phase in the project because it concentrates a large part of the network installation costs and it is the basis of the entire project. In this scenario it is necessary to balance the most economical solution with the necessary quality for the proper...
The Modular Multilevel Converter (MMC) has become the choice topology for integration of renewable energy power plants into the grid, through submarine HVDC cables and HVDC lines. Nevertheless, the MMC requires significant large DC storage capacitors to mitigate for the large power pulsations that result from the single-phase like AC to DC conversion process that takes place in the arms. This work...
In this paper a Model Predictive Control (MPC) was applied to the flux and torque control of a Synchronous Reluctance Motor, SynRM. The behavior of the controller was analyzed based on model's simulations performed in Matlab/Simulink Software. From the results, it was verified that the controller has good performance. The SynRM can reach the speed reference value controlling simultaneously flux and...
This work developed two direct torque control strategies to the switched reluctance machine. The direct torque control based on space vector control and direct instantaneous torque control. The studio is performed using the asymmetric bridge converter that drives the three-phase motor of six poles in the stator and four poles on the rotor. At the beginning shows the principles of operation of the...
Multi-drive power converters have been developed to control two or more machines using a single device. However, they require complex multi-objective and reliable control schemes. Based on the above, this paper presents a proposal of multi-drive topology based on an indirect matrix converter using a predictive control scheme operating at fixed switching frequency to control two independent three-phase...
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