An evolutionary algorithm for the design of hybrid fiber optic-coaxial cable networks in small urban areas

Telecommunication is one of the fastest growing business sectors. Future networks will need to integrate a wide variety of services demanding different qualities and capacities from the network. In this paper, network architecture based on hybrid fiber optic-coaxial cable (HFC) is proposed to develop cable integrated telematic services. An evolutionary algorithm is presented to solve the problem in suitable computation times when dealing with real times civil works problems. Finally we present the results over both problem library and real life scenarios

Heartbeats Do Not Make Good Pseudo-Random Number Generators: An Analysis of the Randomness of Inter-Pulse Intervals

The proliferation of wearable and implantable medical devices has given rise to an interest in developing security schemes suitable for these systems and the environment in which they operate. One area that has received much attention lately is the use of (human) biological signals as the basis for biometric authentication, identification and the generation of cryptographic keys. The heart signal (e.g., as recorded in an electrocardiogram) has been used by several researchers in the last few years. Specifically, the so-called Inter-Pulse Intervals (IPIs), which is the time between two consecutive heartbeats, have been repeatedly pointed out as a potentially good source of entropy and are at the core of various recent authentication protocols. In this work, we report the results of a large-scale statistical study to determine whether such an assumption is (or not) upheld. For this, we have analyzed 19 public datasets of heart signals from the Physionet repository, spanning electrocardiograms from 1353 subjects sampled at different frequencies and with lengths that vary between a few minutes and several hours. We believe this is the largest dataset on this topic analyzed in the literature. We have then applied a standard battery of randomness tests to the extracted IPIs. Under the algorithms described in this paper and after analyzing these 19 public ECG datasets, our results raise doubts about the use of IPI values as a good source of randomness for cryptographic purposes. This has repercussions both in the security of some of the protocols proposed up to now and also in the design of future IPI-based schemes.This work was supported by the MINECO Grant TIN2013-46469-R (SPINY: Security and Privacy in the Internet of You); by the CAMGrant S2013/ICE-3095 (CIBERDINE: Cybersecurity, Data and Risks); and by the MINECO Grant TIN2016-79095-C2-2-R (SMOG-DEV: Security Mechanisms for fog computing: advanced security for Devices). This research has been supported by the Swedish Research Council (Vetenskapsrådet) under Grant No. 2015-04154 (PolUser: Rich User-Controlled Privacy Policies)

Two-Dimensional-Based Hybrid Shape Optimisation of a 5-Element Formula 1 Race Car Front Wing under FIA Regulations

Front wings are a key element in the aerodynamic performance of Formula 1 race cars. Thus, their optimisation makes an important contribution to the performance of cars in races. However, their design is constrained by regulation, which makes it more difficult to find good designs. The present work develops a hybrid shape optimisation approach to obtain an optimal five-element airfoil front wing under the FIA regulations and 17 design parameters. A first baseline design is obtained by parametric optimisation, on which the adjoint method is applied for shape optimisation via Mesh Morphing with Radial Basis Functions. The optimal front wing candidate obtained outperforms the parametric baseline up to a 25% at certain local positions. This shows that the proposed and tested hybrid approach can be a very efficient alternative. Although a direct 3D optimisation approach could be developed, the computational costs would be dramatically increased (possibly unaffordable for such a complex five-element front wing realistic shape with 17 design parameters and regulatory constraints). Thus, the present approach is of strong interest if the computational budget is low and/or a fast new front wing design is desired, which is a frequent scenario in Formula 1 race car design.The authors want to acknowledge the financial support from the Ramón y Cajal 2021 Excellence Research Grant action from the Spanish Ministry of Science and Innovation (FSE/AGENCIA ESTATAL DE INVESTIGACIÓN), the UMA18-FEDERJA-184 grant, and the Andalusian Research, Development and Innovation Plan (PAIDI—Junta de Andalucia) fundings. Partial funding for open access charge: Universidad de Málag

Mechanical connectors to enhance the interfacial debonding of concrete overlays

Concrete bonded whitetoppings and overlays usually fail due to a loss of bond between the layers as a consequence of direct actions (traffic loads) or indirect actions (temperature differences or shrinkage in the layers). These actions generate stresses in the interface that may exceed the strength capacity of the union between layers. This paper proposed an innovative solution for this problem that consisted of placing mechanical connectors in the overlay interfaces to provide them with post-cracking strength and maintaining the monolithic response of the pavement. Three experimental programs on real-scale pavements with two types of mechanical connectors were studied under heavy traffic in terms of structural performance. Findings reveal that this technique might be an excellent solution to the problem of interfacial debonding.The authors would like to thank the Spanish Ministry of Economy and Competitiveness for the financial support provided by the project “Desarrollo de Mejores Rehabilitaciones Locales en Infraestructuras (MERLIN)” (Subprograma INNPACTO) IPT-2012-0313-370000. Ministerio de Economía y Competitividad (Spain). The first author also wishes to thank the Agència de Gestió d’Ajuts Universitaris i de Recerca of the Generalitat de Catalunya and the European Social Fund of the European Union for their financial support provided by the FI-DGR grant.Peer ReviewedPostprint (published version

Characterization of a cluster and its resources in an Ad-Hoc network starting from the truncated geometric distribution

One of the expected properties of the ad hoc networks is the ability to increase its size to receive new nodes and configure new applications without affecting the quality of services. This property, called scalability is affected by the decentralized nature of ad hoc networks making it necessary to develop mechanisms that allow a  large  number  of  nodes  work  together  without  affecting network  performance.  In this  paper,  we  propose  a stochastic  model  based  on  the  geometric  distribution, which allows to characterize the level of resources in a hierarchical  architecture and then  establish  an  appropriate relationship between the level of resources of two successive layers of the network.Una de las propiedades esperadas en las redes ad hoc es la capacidad de aumentar su tamaño recibiendo nuevos nodos y configurando nuevas aplicaciones sin afectar la calidad de los servicios ofrecidos. Esta propiedad, llamada escalabilidad se ve afectada por la naturaleza descentralizada de las redes ad hoc y hace necesario desarrollar mecanismos que le permitan a un gran número de nodos trabajar de manera conjunta sin afectar el rendimiento de la red. En este trabajo, proponemos un modelo estocástico basado en la distribución geométrica truncada, el cual permite caracterizar el nivel de recursos en una arquitectura jerárquica, para luego establecer una relación adecuada entre el nivel de recursos de dos capas sucesivas de la red

Estrés percibido, supresión expresiva y sintomatología neurovegetativa en confinamiento por COVID 19

El presente artículo, tiene el propósito de  establecer la relación del estrés percibido, la supresión expresiva y síntomas neurovegetativos de las personas en situación de confinamiento por COVID 19 en la ciudad de Cuenca. Método: De tipo, correlacional, transversal, no experimental. Se determinó un muestreo no probabilístico por conveniencia, constituido por 249 personas adultas, de la ciudad de Cuenca. Se utilizó la escala de estrés percibido en su versión corta (PSS-4), el Cuestionario de Autorregulación Emocional (ERQ-P) y la escala de síntomas neurovegetativos  creada por los autores de este estudio. Resultados: La regresión lineal evidencia relación no significativa entre supresión expresiva y síntomas neurovegetativos (r= .100; r2= .010), relación no significativa entre  síntomas neurovegetativos y estrés percibido (r= .003; r2= .010), relación significativa entre supresión expresiva y estrés percibido (r= .379; r2= .144; p< .01) y ausencia de relación de la sintomatología neurovegetativa entre supresión expresiva y estrés percibido (r= .390; r2= .152). Conclusiones: Se concluye que no existe relación significativa entre la sintomatología neurovegetativa y el estrés percibido, así como con supresión expresiva, pero si existe correlación positiva y moderada en supresión expresiva y estrés percibido; la sintomatología neurovegetativa, no afecta  la relación entre el estrés percibido y la supresión expresiva

Entre lo normado y lo practicado. Justicia maya en Yucatán: representaciones, normas y percepciones en Kopomá

oai:ojs2.www.antropica.com.mx:article/1The following paper analyses the idea of justice from two approaches: the philosophical and the juridical. It explores the Ley del Sistema de Justicia Maya del Estado de Yucatán in order to have a scenery of the stablished order or what is normalized. There are presented two interviews realized in the municipio of Kopomá, Yucatán, both highlight the comprehension of justice and the maya justice in the habitants, which means, from what is practiced.En el siguiente artículo se analiza la idea de justicia desde el enfoque filosófico y el enfoque jurídico. Se explora la Ley del Sistema de Justicia Maya del Estado de Yucatán para tener una panorama sobre lo establecido, es decir, lo normado. Se presentan dos entrevistas realizadas durante el trabajo de campo en el municipio de Kopomá del Estado de Yucatán que visibilizan la comprensión de justicia y justicia maya en los habitantes, es decir, desde lo practicado

A Survey on 5G Usage Scenarios and Traffic Models

The fifth-generation mobile initiative, 5G, is a tremendous and collective effort to specify, standardize, design, manufacture, and deploy the next cellular network generation. 5G networks will support demanding services such as enhanced Mobile Broadband, Ultra-Reliable and Low Latency Communications and massive Machine-Type Communications, which will require data rates of tens of Gbps, latencies of few milliseconds and connection densities of millions of devices per square kilometer. This survey presents the most significant use cases expected for 5G including their corresponding scenarios and traffic models. First, the paper analyzes the characteristics and requirements for 5G communications, considering aspects such as traffic volume, network deployments, and main performance targets. Secondly, emphasizing the definition of performance evaluation criteria for 5G technologies, the paper reviews related proposals from principal standards development organizations and industry alliances. Finally, well-defined and significant 5G use cases are provided. As a result, these guidelines will help and ease the performance evaluation of current and future 5G innovations, as well as the dimensioning of 5G future deployments.This work is partially funded by the Spanish Ministry of Economy and Competitiveness (project TEC2016-76795-C6-4-R)H2020 research and innovation project 5G-CLARITY (Grant No. 871428)Andalusian Knowledge Agency (project A-TIC-241-UGR18)

Melting of crystals of polarization vortices and chiral phase transitions in oxide superlattices

We study the equilibrium arrangements of polarization vortices in (PbTiO3 )n/(SrTiO3 )n superlattices by means of second-principles simulations. We find that, at low temperatures, polarization vortices organize in a regular arrangement in which clockwise and counterclockwise vortices alternate positions, leading to a crystal-like structure with well-defined handedness. This chiral crystal melts at a critical temperature TM into a chiral liquid where long-range order is lost but handedness is preserved. At even higher temperatures TC, a second pase transition occurs at which the chiral liquid of polarization vortices loses its handedness. Both phase transitions can be readily identified by the adequate choices of order parameters.F.G.-O., P.G.-F., and J.J. acknowledge financial support from Grant No. PGC2018-096955-B-C41 funded by MCIN/AEI/10.13039/501100011033 and by ERDF “A way of making Europe,” by the European Union. J.M.L. was funded by Grant No. FIS2016-74957-P MCIN/AEI/10.13039/501100011033/ and ERDF “A way of making Europe” by the European Union. F.G.-O. acknowledges financial support from Grant No. FPU18/04661 funded by MCIN/AEI/10.13039/501100011033. We thankfully acknowledge computing time at Altamira supercomputer and the technical support provided by the Instituto de Física de Cantabria (IFCA) and Universidad de Cantabria (UC). We also thank J. Á. Herrero for his valuable assistance with the supercomputing environment HPC/HTC cluster Calderon, supported by datacenter 3Mares from Universidad de Cantabri