Archivo Digital UPM
This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.
Materia = Electrónica
Mostrando recursos 1 - 20 de 872
Empiric k·p Hamiltonian calculation of the band-to-band photon absorption in semiconductors - Luque López, Antonio; Panchak, A.; Mellor Null, Alexander Virgil; Vlasov, A.; Martí Vega, Antonio; Andreev, V.
The Empiric k·p Hamiltonian method is usually applied to nanostructured semiconductors. In this paper, it is applied to a homogeneous semiconductor in order to check the adequacy of the method. In this case, the solutions of the diagonalized Hamiltonian, as well as the envelope functions, are plane waves. The procedure is applied to the GaAs and the interband absorption coefficients are calculated. They result in reasonable agreement with the measured values, further supporting the adequacy of the Empiric k·p Hamiltonian method.
Modeling sub-threshold slope and DIBL mismatch of sub-22nm FinFet - Royer del Barrio, Pablo; López Vallejo, Marisa
A great challenge for future information technologies is building reliable systems on top of unreliable components. Parameters of modern and future technology devices are affected by severe levels of process variability and devices will degrade and even fail during the normal lifeDme of the chip due to aging mechanisms. These extreme levels of variability are caused by the high device miniaturizaDon and the random placement of individual atoms. Variability is considered a "red brick" by the InternaDonal Technology Roadmap for Semiconductors. The session is devoted to this topic presenDng research experiences from the Spanish Network on Variability called VARIABLES. In...
A Dynamically Adaptable Bus Architecture for Trading-Off Among Performance, Consumption and Dependability in Cyber-Physical Systems - Valverde Alcalá, Juan; Rodriguez, Alfonso; Camarero, Julio; Otero Marnotes, Andres; Portilla Berrueco, Jorge; Torre Arnanz, Eduardo de la; Riesgo Alcaide, Teresa
Cyber-Physical Systems need to handle increasingly complex tasks, which additionally, may have variable operating conditions over time. Therefore, dynamic resource management to adapt the system to different needs is required. In this paper, a new bus-based architecture, called ARTICo3, which by means of Dynamic Partial Reconfiguration, allows the replication of hardware tasks to support module redundancy, multi-thread operation or dual-rail solutions for enhanced side-channel attack protection is presented. A configuration-aware data transaction unit permits data dispatching to more than one module in parallel, or provide coalesced data dispatching among different units to maximize the advantages of burst transactions. The selection...
Dynamic Management of Multikernel Multithread Accelerators Using Dynamic Partial Reconfiguration - Rodriguez, Alfonso; Valverde Alcalá, Juan; Torre Arnanz, Eduardo de la; Riesgo Alcaide, Teresa
Ever demanding systems with restricted resources face increasingly complex applications. Additionally, changeable environments modify working conditions over time. Therefore, a dynamic resource management is required in order to provide adaptation capabilities. By using ARTICo3, a bus-based architecture with reconfigurable slots, this adaptation is accomplished in three different but dependent areas: Consumption, Confidentiality and fault tolerance, and Computation. The proposed resource management strategies rely on an architecture and a model of computation that make execution configuration to be application-independent, but context-aware, since a CUDA-like execution model is used. The inherent and explicit application-level parallelism of multithreaded CUDA kernels is used to...
LED bulb lamps technical specification and testing procedure for solar home systems. - Narvarte Fernández, Luis; Carrasco Moreno, Luis Miguel; Gago Calderón, Alfonso; Díaz Martínez, Miguel
With the consolidation of the new solid state lighting LEOs devices, te5t1n9 the compliance 01 lamps based on this technology lor Solar Home Systems (SHS) have been analyzed. The definition of the laboratory procedures to be used with final products 15 a necessary step in arder to be able to assure the quality of the lamps prior to be installed . As well as with CFL technology. particular attention has been given to simplicity and technical affordability in arder to facilitate the implementation of the test with basie and simple laboratory too15 even on the same SHS electrification program locations....
Fluoro-sensing applied to detection and identification of hydrocarbons in inland waters. Study of the impact of different UV light sources - Arqués Orobón, Francisco José; González Posadas, Vicente; Jiménez Martín, José Luis; Gutiérrez Rios, Julio; Esteban Orobio, Ángel
This paper presents the detection and identification of hydrocarbons through flu oro-sensing by developing a simple and inexpensive detector for inland water, in contrast to current systems, designed to be used for marine waters at large distances and being extremely costly. To validate the proposed system, three test-benches have been mounted, with various UV-Iight sources. Main application of this system would be detect hydrocarbons pollution in rivers, lakes or dams, which in fact, is of growing interest by administrations.
Laboratorio remoto eLab3D: un entorno innovador para el aprendizaje de competencias prácticas en electrónica - López Gregorio, Sergio; Carpeño Ruiz, Antonio; Arriaga García de Andoaín, Jesús; Arcas Castro, Guillermo de; Contreras, Daniel; Salazar, José; Barras, Miguel
Este artículo muestra la utilización de las nuevas tecnologías al servicio del aprendizaje de competencias prácticas en electrónica, siendo un ejemplo de adaptación de los recursos educativos a diferentes contextos y necesidades. Se trata de un laboratorio remoto en el que la adecuada complementación de un hardware configurable y un software de última generación permite al estudiante realizar prácticas de electrónica y diseño de circuitos en un mundo virtual 3D. El usuario dispone de un avatar e interacciona con réplicas virtuales de instrumentos, placas de circuitos, componentes o cables de forma muy similar a como se opera en un laboratorio...
Evaluation of the utilization of electric vehicles for building energy management in hotels - Gamallo, Carlos; Álvaro, Roberto; Fraile Ardanuy, José Jesús; González, Jairo; Fuentes Gomariz, Manuel
Governments are working in new policies to slow down total energy consumption and greenhouse gases (GHG) emissions, promoting the deployment of electric vehicles (EVs) in all countries. In order to facilitate this deployment and help to reduce the final costs of their batteries, additional utilization of EVs when those are parked has been proposed. EVs can be used to minimize the total electricity cost of buildings (named vehicle to building applications, V2B). In this paper an economic evaluation of EVs in the Building Energy Management System is shown. The optimal storage capacity and its equivalent number of EVs are determined....
The counteractive effect of the sensor housing on the unit sensitivity across a series of dynamic temperature profiles. - Badia-Melis, Ricardo; García-Hierro, Javier; Ruiz García, Luis; Jiménez Ariza, Heidi Tatiana; Robla Villalba, Jose Ignacio; Barreiro Elorza, Pilar
The advantages of wireless sensing implemented on the cold chain of fresh products are well known. These sensor systems consist of a combination of delicate internal electronic circuitry enclosed in a special housing unit. Manufacturers however are presented with the challenge that the housing required to withstand the harsh environment in which the sensors are being used all too often take from the functionality of the sensor. Therefore the target of this study is to determine the dynamic behavior and the counteractive effects of the sensor housing on temperature recording accuracy in the wireless nodes of Wireless Sensor Network (WSN)...
High-accuracy adaptive simulations of a Petri dish exposed to electromagnetic radiation - Gómez Revuelto, Ignacio; García Castillo, Luis Emilio; Pardo Zubiaur, David
This paper analyses numerically the electric field distribution of a liquid contained in a Petri dish when exposed to electromagnetic waves excited in a rectangular waveguide. Solutions exhibit high-gradients due to the presence of the dielectric liquid contained in the dish. Furthermore, electromagnetic fields within the dielectric have a dramatically lower value than on the remaining part of the domain, which difficults its simulation. Additionally, various singularities of different intensity appear along the boundary of the Petri dish. To properly reproduce and numerically study those effects, we employ a highly-accurate hp-adaptive finite element method. Results of this study demonstrate that...
A low-area reference-free power supply sensor - Benito Sánchez, Carlos; Ituero Herrero, Pablo; López Vallejo, Marisa
Power supply unpredictable uctuations jeopardize the functioning of several types of current electronic systems. This work presents a power supply sensor based on a voltage divider followed by buffer-comparator cells employing just MOSFET transistors and provides a digital output. The divider outputs are designed to change more slowly than the thresholds of the comparators, in this way the sensor is able to detect voltage droops. The sensor is implemented in a 65nm technology node occupying an area of 2700?m2 and displaying a power consumption of 50?W. It is designed to work with no voltage reference and with no clock and...
Global optimization of solar thermophotovoltaic systems - Datas Medina, Alejandro; Algora del Valle, Carlos
n this paper, we present a theoretical model based on the detailed balance theory of solar thermophotovoltaic systems comprising multijunction photovoltaic cells, a sunlight concentrator and spectrally selective surfaces. The full system has been defined by means of 2n + 8 variables (being n the number of sub-cells of the multijunction cell). These variables are as follows: the sunlight concentration factor, the absorber cut-off energy, the emitter-to-absorber area ratio, the emitter cut-off energy, the band-gap energy(ies) and voltage(s) of the sub-cells, the reflectivity of the cells' back-side reflector, the emitter-to-cell and cell-to-cell view factors and the emitter-to-cell area ratio. We have used...
Development and experimental evaluation of a complete solar thermophotovoltaic system - Datas Medina, Alejandro; Algora del Valle, Carlos
We present a practical implementation of a solar thermophotovoltaic (TPV) system. The system presented in this paper comprises a sunlight concentrator system, a cylindrical cup-shaped absorber/emitter (made of tungsten coated with HfO2), and an hexagonal-shaped water-cooled TPV generator comprising 24 germanium TPV cells, which is surrounding the cylindrical absorber/emitter. This paper focuses on the development of shingled TPV cell arrays, the characterization of the sunlight concentrator system, the estimation of the temperature achieved by the cylindrical emitters operated under concentrated sunlight, and the evaluation of the full system performance under real outdoor irradiance conditions. From the system characterization, we have...
Leakage and temperature aware server control for improving energy efficiency in data centers - Zapater Sancho, Marina; Ayala Rodrigo, José Luis; Moya Fernández, José Manuel; Vaidyanathan, Kalyan; Gross, Kenny; Coskun, Ayse K.
Reducing the energy consumption for computation and cooling in servers is a major challenge considering the data center energy costs today. To ensure energy-efficient operation of servers in data centers, the relationship among computa- tional power, temperature, leakage, and cooling power needs to be analyzed. By means of an innovative setup that enables monitoring and controlling the computing and cooling power consumption separately on a commercial enterprise server, this paper studies temperature-leakage-energy tradeoffs, obtaining an empirical model for the leakage component. Using this model, we design a controller that continuously seeks and settles at the optimal fan speed to minimize...
On the leakage-power modeling for optimal server operation - Arroba García, Patricia; Zapater Sancho, Marina; Ayala, José L.; Moya Fernández, José Manuel; Olcoz, Katzalin; Hermida, Román
Leakage power consumption is a com- ponent of the total power consumption in data cen- ters that is not traditionally considered in the set- point temperature of the room. However, the effect of this power component, increased with temperature, can determine the savings associated with the careful management of the cooling system, as well as the re- liability of the system. The work presented in this paper detects the need of addressing leakage power in order to achieve substantial savings in the energy consumption of servers. In particular, our work shows that, by a careful detection and management of two...
Receptores homodinos a 300 GHz basados en tecnología CMOS - González Posadas, Vicente; Segovia Vargas, Daniel; Montero de Paz, Javier; Portillo López-Mingo, Álvaro; Crooks, Jamie; Huggard, Peter G.; García Muñoz, Enrique; Alderman, B.; Turchetta, R.
Using CMOS transistors for terahertz detection is currently a disruptive technology that offers the direct integration of a terahertz detector with video preamplifiers. The detectors are based on the resistive mixer concept and its performance mainly depends on the following parameters: type of antenna, electrical parameters (gate to drain capacitor and channel length of the CMOS device) and foundry. Two different 300 GHz detectors are discussed: a single transistor detector with a broadband antenna and a differential pair driven by a resonant patch antenna.
Robust control of underactuated wheeled mobile manipulators using GPI disturbance observers - Morales Cabrera, Rafael; Sira Ramírez, Hebertt; Somolinos Sanchez, Jose Andres
This article describes the design of a linear observer–linear controller-based robust output feedback scheme for output reference trajectory tracking tasks in the case of nonlinear, multivariable, nonholonomic underactuated mobile manipulators. The proposed linear feedback scheme is based on the use of a classical linear feedback controller and suitably extended, high-gain, linear Generalized Proportional Integral (GPI) observers, thus aiding the linear feedback controllers to provide an accurate simultaneous estimation of each flat output associated phase variables and of the exogenous and perturbation inputs. This information is used in the proposed feedback controller in (a) approximate, yet close, cancelations, as lumped unstructured...
Evaluation, energy optimization, and spectrum analysis of an artificial noise technique to improve CWSN security - Blesa Martínez, Javier; Araujo Pinto, Álvaro; Romero Perales, Elena; Nieto-Taladriz García, Octavio
This paper presents the security evaluation, energy consumption optimization, and spectrum scarcity analysis of artificial noise techniques to increase physical-layer security in Cognitive Wireless Sensor Networks (CWSNs). These techniques introduce noise into the spectrum in order to hide real information. Nevertheless, they directly affect two important parameters in Cognitive Wireless Sensor Networks (CWSNs), energy consumption and spectrum utilization. Both are affected because the number of packets transmitted by the network and the active period of the nodes increase. Security evaluation demonstrates that these techniques are effective against eavesdropper attacks, but also optimization allows for the implementation of these approaches in...
Wide-angle, high-concentration photovoltaics to compete with flat plate systems - Mohedano, Rubén; Cvetkovic, Aleksandra; Benitez Gimenez, Pablo; Miñano Dominguez, Juan Carlos; Hernández Sanz, Maikel; Zamora Herranz, Pablo; Vilaplana, J.
A novel photovoltaic concentrator enables highly uniform irradiance on a small number of efficient solar cells. The maximum electrical power of a photovoltaic (PV) energy installation depends on three factors: the available irradiance, the size of the systems collecting sunlight, and the rate at which the device transforms light into electricity (the conversion efficiency). Developers can maximize the irradiance by carefully selecting the site and orientation of the solar facility. But they can only expand their sunlight collection systems for standard flat plate PV devices by increasing the number of solar cells, at greater cost. Here, we consider the advantages...