Diseño e implementación de una solución de VoIP en un entorno empresarial

El desarrollo de las redes IP ha marcado un creciente interés por unificar todas las comunicaciones sobre una misma infraestructura aprovechando así el cableado existente. Con esta idea nació la tecnología conocida como VoIP (Voice Over Internet Protocol) que consiste en la trasmisión de la voz sobre paquetes IP. El objetivo principal de este proyecto es el diseño e implementación de una infraestructura de voz sobre IP que utilice una red de datos existente. La primera parte del proyecto estará formada por un estudio detallado de los factores que influyen en esta tecnología: codecs, protocolos y otros factores a tener en cuenta. Tras esta parte, aprovechando la experiencia adquirida durante casi tres años en una empresa integradora de servicios, se realizará un caso de estudio en el que, bajo las premisas impuestas por un supuesto cliente, se diseñará una solución que cumpla todos los requisitos y aporte un valor añadido sobre el sistema de telefonía que posee el cliente. El diseño de la mejor solución se hará utilizando productos del fabricante Cisco Systems y, además del coste económico, se valorarán los esfuerzos personales que costará montar dicha solución, incluyendo un valor añadido como es el dotar de buzón de voz y mensajería a todos los usuarios. La última parte del caso de estudio consistirá en la implementación de la infraestructura anteriormente diseñada adquiriendo conocimientos sobre virtualización de servidores utilizando productos de la compañía VMWare (especialista en virtualización), instalación y parametrización de aplicativos de Cisco y, finalmente, la interconexión con la red pública a través de gateways para poder hacer llamadas al exterior. El proyecto finalizará con la presentación de unas conclusiones finales y la exposición de unas líneas futuras de trabajo. ABSTRACT. The IP network development has marked a growing interest in unifying all communications over the same infrastructure taking advantage of the existing wiring. From this idea, a technology was born known as VoIP (Voice Over Internet Protocol) which consists of the transmission of voice packets over the IP network. The main goal of this project is the design and implementation of a VoIP infrastructure for transmitting voice packets over the existing wired network infrastructure on the client. The first part of the project will consist of a detailed study of the factors influencing this technology: codecs, protocols, and other factors to consider. After this part, drawing on the experience gained during nearly three years in an integrated services company, a case study will be made under the premises imposed for a supposed client. A solution that serves all the requirements will be designed and provide an added value on the customer’s telephone system. The design of the best solution will be done using Cisco Systems products and besides the economic cost of the whole solution, the personal effort cost will be valued. The added value named before will be provided with two important applications such as voice mail and instant messaging for all users. The last part of the case study will consist in the implementation of an infrastructure designed to acquire knowledge about virtualization, using VMWare company products (specialist in virtualization), installation and configuration of applications from Cisco Systems and finally the interconnection with the public network through gateway routers in order to make external calls. The project will end with the presentation of final conclusions and exposing future working lines

Caracterización experimental mediante técnicas ópticas de sprays en combustión con mezclas de combustibles gasolina y diesel

Sprays injected into an atmosphere with thermodynamic conditions similar to those occuring inside the cylinder of an internal combustion engine have been characterized motor of ignition for the compression for the automotive is carried out. As fuel, commercial gasoline and diesel blends are used in different proportions, given the potential mixtures have for producing efficient fuels in compression ignition engines, with pollutant emissions lower than those achieved in current diesel engines. The experimental characterization is performed in an engine equipped with optical access, high speed visualization techniques. The measurement of the amount of soot existing in these flames is realized applying techniques of extinction of light.La utilización de mezclas de gasolina y diésel como combustible en motores de encendido por compresión ha mostrado recientemente ser un combustible prometedor para conseguir combustiones eficientes y limpias en motores de automoción. En este proyecto se han caracterizado experimentalmente sprays inyectados en la cámara de combustión de un motor óptico utilizando como combustible mezclas de gasolinas y combustibles diésel comerciales en diferentes proporciones. Las características del autoencendido y de la combustión de estas mezclas se han analizado utilizado técnicas de imagen de alta velocidad en una amplia variedad de condiciones de motor. La producción de hollín en la llama se ha medido usando técnicas de extinción de la luz.Escobedo Carbonell, P. (2017). Caracterización experimental mediante técnicas ópticas de sprays en combustión con mezclas de combustibles gasolina y diesel. Universitat Politècnica de València. http://hdl.handle.net/10251/86392TFG

NFC based Polymer Strain Sensor for Smart Packaging

This paper presents a polymer strain sensor integrated with an NFC tag to detect strain semi-quantitatively. The strain sensor is fabricated using flexible and transparent polymer Polydimethylsiloxane (PDMS) microchannel having conductive polymer poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as an active material. The sensor was tested with different bending conditions and it was found that the resistance increases with higher bending. A maximum of 3 order change in resistance was observed for ~100 bending. The sensor was finally tested using a custom-developed passive NFC tag having an LED connected in series with the strain sensor and powered from the reader via the NFC antenna in the tag

Readout circuit with improved sensitivity for contactless LC sensing tags

In this work we present a novel technique to estimate the resonance frequency of LC chipless tags (inductor-capacitor parallel circuit) with improved sensitivity and linearity. The developed reader measures the power consumption of a Colpitts oscillator during a frequency sweep. The readout circuit consists of a Colpitts oscillator with a coil antenna, varactor diodes to change the oscillator frequency, analog circuitry to measure the power consumption and a microcontroller to control the whole system and send the data to a PC via USB. When an LC tag is inductively coupled to the oscillator, without contact, a maximum power peak is found. As shown by an experimental calibration using an LC tag made on FR4 substrate, the frequency of this maximum is related to the resonance frequency. Both parameters, power consumption and resonance frequency, present an excellent linear dependence with a high correlation factor (R 2 = 0.995). Finally, a screen-printed LC tag has been fabricated and used as relative humidity sensor achieving a sensitivity of (−2.41 ± 0.21) kHz/% with an R 2 of 0.946

3D Printed Robotic Hand with Embedded Touch Sensors

This paper presents a 3D printed robotic hand designed to have two capacitive touch sensors embedded in the distal phalanges of the fingers. Additionally, the readout electronics have been designed and fabricated to obtain the digital values of the capacitances and to use this data for touch feedback control. The touch or pressure sensors were fabricated by 3D printed electrodes using copper based conductive filament and a two part-rubber as the dielectric. The sensitive rmgertip was tested with dynamic and static stimuli and the average sensitivity of the sensors was found to be 0.6% N-1. The proof-of-concept robot hand developed here shows that the concept could be applied to develop the 3D printed embedded sensorised systems or instrumented objects needed for applications such as internet of things and human-computer interaction

3D Printed Packaging of Photovoltaic Cells for Energy Autonomous Embedded Sensors

Most robotic/prosthetic hands lack the ability to harvest energy, and as a result they rely on the batteries to provide the required energy for their operation. Recently solar cells have been explored to meet the energy requirements. However, most solar cells are brittle, and their chances of getting damaged during robotic operation are high. The work presented in this paper addresses this challenge through a transparent 3D printed package covering three photovoltaic cells. The package protects the cells from impact and prevents dust accumulation while ensuring minimal loss of light reaching the cells. The effect of the protective 3D printed cover on the performance of photovoltaic panel have been evaluated. This solar cell package is integrate on a 3D printed robotic hand to harvest energy from the environmental illumination and utilizes it to power the small peripheral electronic and sensing components on the hand

Electronic Skin With Energy Autonomous Proximity Sensing for Human-Robot Interaction

Electronic skin or eSkin is critical to enhance the interactive capabilities of robots through physical contact. The current approaches to develop this capability involve using multiple sensors distributed on robot’s body. Energy requirement of such eSkin is currently met through batteries, which is not ideal as it may reduce the operational time and requires frequent charging. In this work, we present an eSkin consisting of distributed energy autonomous proximity sensors. The eSkin contains an array of miniaturized solar cells to generate energy needed for infrared LEDs based proximity sensors. As a proof of concept, the eSkin has been integrated in an industrial robot arm UR5 and proximity sensing has been shown to enable safe Human-Robot Interaction (HRI)

Disposable and Flexible Sensor Patch for α-amylase Detection in Human Blood Serum

Disposable and flexible sensors are needed in biomedical and healthcare applications because of hygiene requirements. At the same time, they should provide an affordable solution for point-of-care (POC) testing and large-scale deployment. In this view, herein we report flexible polyimide-based disposable sensor patch for the detection of a-amylase in blood serum. The concentration of a-amylase in blood serum is a potential indicator of health issues such as pancreatitis and pancreatic cancer and an affordable solution to detect its concentration could benefit many. Here, the detection is based on thermal Marangoni circulation inside a microfluidic droplet of starch-FeSO 4 salt solution, which detects the a-amylase concentration upon addition of blood serum. It was observed that the temperature difference between the droplet substrate and ambient sets a thermal Marangoni and natural convections motion inside the droplet. The performance of the microdropletbased sensor was best at temperature difference (~18–20°C). The sensor is capable of detecting 20-110 units/liter concentration of α-amylase with ~80% change in the electrical resistance across the microdroplet (at ~40°C substrate temperature), and with a sensitivity of 0.88% (units/liter) -1 . The response of the sensor was also compared with pathological laboratory results and both were found to be in agreement. The presented sensor has the potential to be used as a POC device for detecting α-amylase in real-time