Modelado y simulación de una planta solar Fresnel de refrigeración

Este Trabajo de Fin de Grado trata sobre el modelado y simulación de la planta de refrigeración solar ubicada en el techo del edificio de la Escuela Técnica Superior de Ingeniería de Sevilla. La planta está compuesta por tres elementos principales: un campo de colectores solares de Fresnel, una máquina de absorción de doble efecto y un acumulador de energía. El campo solar calienta el agua y es utilizada por la máquina de absorción para producir aire acondicionado para el edificio. Si la radiación solar disponible no es lo suficientemente alta como para alcanzar la temperatura adecuada para el enfriador de agua, el acumulador de energía se puede usar si está cargado. Cada componente se describe con detalle en el trabajo. Se desarrolla y presenta un modelo matemático de los tres componentes y las tuberías que los conectan. Los modelos desarrollados tienen como objetivo obtener un comportamiento similar en comparación con los reales, y de este modo, tener una adecuada compensación entre complejidad y precisión. Los modelos muy complejos replican más exactamente el comportamiento de los sistemas reales al costo de aumentar dramáticamente la carga computacional. Dado que uno de los objetivos del desarrollo de este modelo es su utilización como un banco de pruebas para las estrategias de control, se debe descartar un modelo muy complejo. Los modelos desarrollados en este trabajo se comparan con datos reales obtenidos de la planta real. También se proporcionan algunas simulaciones utilizando el modelo agregado de la planta de refrigeración solar.This Final Degree Project deals with the modeling and simulation of the solar cooling plant located at the roof of the Higher Technical School of Engineering of Seville building. The plant is composed by three main elements: a Fresnel Solar Collector Field, a double effect absorption machine and a storage tank. The solar field heats up pressurized water used by the absorption machine to produce air conditioning for the building. If the solar radiation available is not high enough to reach the adequate temperature for the water chiller, the storage tank can be used if charged. Every component is accurately described in the text. A mathematical model of the three components and the pipes connecting them is developed and presented. The models developed here aim at obtaining a similar behaviour compared to the real ones. Thus an adequate trade-off between complexity and precision. Very complex models replicate more exactly the behaviour of the real systems at the cost of increasing dramatically the computational burden. Since one of the goals of the developing of this model is to be used as a test-bench for control strategies, a very complex model has to be ruled out. The models developed in this work are compared to real data obtained from the real plant. Some simulations are also provided used the aggregate model of the solar cooling plant.Universidad de Sevilla. Grado en Ingeniería Electrónica, Robótica y Mecatrónic

Efficient Implementation on Low-Cost SoC-FPGAs of TLSv1.2 Protocol with ECC_AES Support for Secure IoT Coordinators

Security management for IoT applications is a critical research field, especially when taking into account the performance variation over the very different IoT devices. In this paper, we present high-performance client/server coordinators on low-cost SoC-FPGA devices for secure IoT data collection. Security is ensured by using the Transport Layer Security (TLS) protocol based on the TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 cipher suite. The hardware architecture of the proposed coordinators is based on SW/HW co-design, implementing within the hardware accelerator core Elliptic Curve Scalar Multiplication (ECSM), which is the core operation of Elliptic Curve Cryptosystems (ECC). Meanwhile, the control of the overall TLS scheme is performed in software by an ARM Cortex-A9 microprocessor. In fact, the implementation of the ECC accelerator core around an ARM microprocessor allows not only the improvement of ECSM execution but also the performance enhancement of the overall cryptosystem. The integration of the ARM processor enables to exploit the possibility of embedded Linux features for high system flexibility. As a result, the proposed ECC accelerator requires limited area, with only 3395 LUTs on the Zynq device used to perform high-speed, 233-bit ECSMs in 413 µs, with a 50 MHz clock. Moreover, the generation of a 384-bit TLS handshake secret key between client and server coordinators requires 67.5 ms on a low cost Zynq 7Z007S device

Propuesta de gestión de procesos para mejorar la calidad de servicio en plataforma de ventanillas en el Banco Interbank sucursal 723 – Talara, 2020

Se desarrollo en la entidad bancaria interbank-723 talara, el cual es una de las principales instituciones financieras del país enfocado en brindar productos innovadores y un servicio conveniente y ágil a más de 2 millones de peruanos. al ser este rubro bancario y con la gran demanda que se ha proyectado para los próximos años en la mejora de atención al cliente. interbank-723, se ve en la necesidad de mejorar la atención al cliente mejorando la calidad de servicio en el área de plataforma de ventanillas mediante un sistema de mejora continua que le permita mejorar la capacidad de los colaboradores, modificando la infraestructura del área estudiada e innovando herramientas tecnológicas aumentando sus márgenes de rapidez, atención y consultas; reduciendo de tal manera el % de insatisfacción de nuestros clientes. interbank-723, cuenta con más de 50 años en el mercado, pero con varias deficiencias en el proceso de atención al cliente que hacen que esta calidad de servicio sea ineficiente. utilizando la metodología phva, que es la que se adecua mejor al proyecto en mención para mejorar la calidad de servicio, se identificaron los indicadores actuales junto a los principales problemas del banco gracias a herramientas de verificación y al diagrama de lynn shostack podremos profundizar más en estos problemas. luego procedimos a realizar un plan de mejora, y así cumplir etapa por etapa con la finalidad de lograr los objetivos planteados. finalmente, al saber las aceptaciones y compromiso de gerencia y colaboradores se proceden a la implementación y entrenamiento para hacer valida el proceso de mejora continua, obteniendo como resultado interés y aprendizaje

An Innovative Strategy Based on Secure Element for Cyber–Physical Authentication in Safety-Critical Manufacturing Supply Chain

This research has been founded by the European Union’s Horizon 2020 Research and Innovation program under grant agreement No. 871518, a project named, A COmprehensive cyber-intelligence framework for resilient coLLABorative manufacturing Systems, COLLABS [55].The accurate tracking of every production step and related outcome in a supply chain is a stringent requirement in safety-critical sectors such as civil aviation. In such a framework, trusted traceability and accountability can be reliably and securely managed by means of blockchain-based solutions. Unfortunately, blockchain cannot guarantee the provenance and accuracy of the stored information. To overcome such a limitation, this paper proposes a secure solution to strongly rely on the tracking information of the physical assets in the supply chain. The proposed solution exploits Hardware Security Modules (HSMs) to provide required cryptographic primitives through a Near-Field Communication (NFC) connection. In our approach, each transfer of the assets is authenticated, verified, and recorded in the blockchain through the HSM. Transaction entries are signed, thus providing a guarantee of ownership and authenticity. The proposed infrastructure has been subject of an exhaustive security analysis and proved resilient against counterfeiting attempts, stakeholder repudiations, and misleading information.Horizon 2020 Framework Programme 871518 H202

Table-Free Seed Generation for Hardware Newton–Raphson Square Root and Inverse Square Root Implementations in IoT Devices

Consejeríaa de Economía y Conocimiento de la Junta de Andalucía y el Fondo Europeo de Desarrollo Regional (FEDER) bajo el proyecto B-TIC-588-UGR2

The relevance of fluorescence radiation in Cherenkov telescopes

Cherenkov telescopes are also sensitive to the atmospheric fluorescence produced by the extensive air showers. However this contribution is neglected by the reconstruction algorithms of imaging air Cherenkov telescopes IACTs and wide-angle Cherenkov detectors WACDs. In this paper we evaluate the fluorescence contamination in the Cherenkov signals from MC simulations in both kinds of Cherenkov telescopes and for some typical observational situations. Results for an observation level of 2200 m a.s.l. are shown. In addition, the feasibility and capabilities of IACTs working as fluorescence telescopes are discussed with the assistance of some geometrical calculations

A compact model of the ZARC for circuit simulators in the frequency and time domains

Equivalent-circuit models containing fractional-order elements are often employed to make use of fractionalorder calculus in the frequency and time domains in a variety of applications. Many of these circuits contain constant-phase elements that appear in parallel with a resistor in a configuration called ZARC. But to avoid fractional order derivatives and include it in circuit simulators, the ZARC itself can also be replaced by equivalent circuit models that only contain integer order elements, such as resistors and capacitors. In this article, a novel compact model is presented to substitute the ZARC by a multiple-RC network. This model is valid for a continuous value of the order exponent and is applicable over a very wide range of frequencies, making it useful in both the frequency and time domains. Since it uses only basic functions and operators, it has been easily implemented as a subcircuit in circuit simulators. The validity of the model has been verified and it has been compared with some previously proposed passive circuit models. The model has also been discussed in relation to the initialization problem, which is an often overlooked challenge in fractional-order circuits.Universidad de Granada/CBU

Dracon: An Open-Hardware Based Platform for Single-Chip Low-Cost Reconfigurable IoT Devices

The development of devices for the Internet of Things (IoT) requires the rapid prototyping of different hardware configurations. In this paper, a modular hardware platform allowing to prototype, test and even implement IoT appliances on low-cost reconfigurable devices is presented. The proposed platform, named Dracon, includes a Z80-clone microprocessor, up to 64 KB of RAM, and 256 inputs/outputs (I/Os). These I/Os can be used to connect additional co-processors within the same FPGA, external co-processors, communications modules, sensors and actuators. Dracon also includes as default peripherals a UART for programming and accessing the microprocessor, a Real Time Clock, and an Interrupt Timer. The use of an 8-bit microprocessor allows the use of the internal memory of the reconfigurable device as program memory, thereby, enabling the implementation of a complete IoT device within a single low-cost chip. Indeed, results using a Spartan 7 FPGA show that it is possible to implement Dracon with only 1515 6-input LUTs while operating at a maximum frequency of 80 MHz, which results in a better trade-off in terms of area and performance than other less powerful and less versatile alternatives in the literature. Moreover, the presented platform allows the development of embedded software applications independently of the selected FPGA device, enabling rapid prototyping and implementations on devices from different manufacturers.Junta de AndaluciaEuropean Commission B-TIC-588-UGR2

Transcription regulation of TNF-α-early response genes by poly(ADP-ribose) polymerase-1 in murine heart endothelial cells

The original publication is a available at www.oxfordjournals.org.-- 10 pp.[EN] Poly(ADP-ribose) polymerase-1 (PARP-1) has been involved in endothelial cell dysfunction associated with various pathophysiological conditions. The intrinsic mechanism of PARP-1-mediated endothelial cell dysfunction could be related to PARP-1 overactivation, NAD+ consumption and ATP depletion. An alternative way could involve transcription regulation. By using high-density microarrays, we examined early tumor necrosis factor α(TNF- α)- stimulated gene expression profiles in PARP-1+/+ and PARP-1-/- murine heart endothelial cells. TNF-α modulated a significant number of genes in both cell types. We have identified a set of genes whose expression in response to TNF-a is modulated by PARP-1, whereas the expression of others is PARP- 1-independent. Up-regulation of several genes involved in the inflammatory response is hampered in the absence of PARP-1. Moreover, NF-қB-dependent transcriptional activation is partially inhibited in PARP-1-/- compared to PARP-1+/+ cells. However, we found that PARP-1 might also silence transcription of several NF-қB target genes. Overall, our results show that PARP-1 is regulating the expression of genes by the endothelial cells both in a positive and a negative fashion, with the final effects depending on the gene. Individual studies of these genes are now necessary to clarify the intrinsic mechanism by which PARP-1 is controlling transcription and thereby finding out different therapeutic approaches involving PARP-1.A.C. is a recipient of a fellowship from Fundación Séneca. J.Y. is an Investigator from the Ramón y Cajal Program (Spanish Ministerio de Ciencia y Tecnología). This work was supported by the Instituto de Salud Carlos III Grants PI021138 and C03/02.Peer reviewe

Fine-Grained Access Control with User Revocation in Smart Manufacturing

This research has been founded by the European Union’s Horizon 2020 Research and Innovation program under grant agreement No. 871518, a project named COLLABS [19].Collaborative manufacturing is a key enabler of Industry 4.0 that requires secure data sharing among multiple parties. However, intercompany data-sharing raises important privacy and security concerns, particularly given intellectual property and business-sensitive information collected by many devices. In this paper, we propose a solution that combines four technologies to address these challenges: Attribute-Based Encryption for data access control, blockchain for data integrity and non-repudiation, Hardware Security Modules for authenticity, and the Interplanetary File System for data scalability. We also use OpenID for dynamic client identification and propose a new method for user revocation in Attribute-Based Encryption. Our evaluation shows that the solution can scale up to 2,000,000 clients while maintaining all security guarantees.European Union’s Horizon 2020, 87151