No description available.

The purpose of this thesis is going to design a microstrip antenna that can detect the different tissue, according to this clue, we suppose that it can be used in medical application, for example to detect the breast tumor. Our research and guess are based on the different electrical properties of the tissue. Follow the conductivity and permittivity of different tissue, a simple 3D breast structure is going to be modelled, and a tumor tissue will be defined too. Four types of antenna have been designed and simulated in HFSS. The antenna with best performance will be manufactured, which is the rectangular microstrip antenna with gap, it works under 2.45Ghz resonate frequency, and with dimension 37.26mm×28.83mm. Test S21 of antenna in Vector Network Analyser with different biological tissue, in order to make a simple prove that the antenna can detect the different tissue. The result shows when we use the different tissue’s size and quantity, the S21 changes.

No description available.

No description available.

In order to achieve Full Duplex (FD) communication, currently studied solutionsfor the commercial sector rely on advanced Self-Interferece Cancellation (SIC)techniques to remove the transmitted signal from the received one. This thesis expandsthe research of these techniques by evaluating their potential usage in militarycommunication scenarios where requirements and conditions are distinct,firstly, by identifying, categorizing and describing a set of previously proposedsic techniques and secondly, by performing a comprehensive simulation andanalysis of two suggested sic techniques as part of a FD transceiver. Though themajority of the considered SIC techniques was determined to be potentially implementablein military FD transceivers, some frequency-dependent techniquesand techniques prohibiting omnidirectional communication could not be used.The simulation and analysis of the two suggested SIC techniques show that undercertain conditions, such as limited transmission power and/or reflective environment,close to complete suppression could be realized even with high nonlineardistortion in the transmit chain.

This thesis employs models of homogenous and differentiated products to empirically investigate the demand for mobile phone services in Sub-Saharan African countries. The thesis consists of a short introductory chapter, three self-contained empirical chapters, and a summary chapter. In Chapter 2, we use survey data conducted in 2011 in eleven countries in Sub-Saharan African to analyze how the availability of physical infrastructure influences the adoption of mobile phones and usage of mobile services. The availability of physical service infrastructure is approximated by data on night-time light intensity in the areas in which survey respondents reside. After controlling for a number of individual and household characteristics including disposable income, we find that adoption of mobile phones is higher in areas with better physical infrastructure. However, in the group of mobile phone adopters, the use of mobile phones for mobile financial transactions is negatively influenced by the level of infrastructure. Mobile phone users who live in areas with poor infrastructure are more likely to rely on mobile phones to make financial transactions than individuals living in areas with better infrastructure. On the other hand, the use of mobile phones to access services such as email, skype, social media networks and Internet browsing is not dependent on the availability of physical infrastructure. Our results support the notion that mobile phones improve the livelihoods of individuals residing in remote areas by providing them with access to financial services which are otherwise not available physically. Chapter 3 examines the effect of mobile number portability (MNP) on own- and cross-price elasticities. Using quarterly data for 28 mobile operators in seven Sub-Saharan Africa countries between 2010Q4 to 2014Q4 to estimate a differentiated products demand model, we find that MNP increased own-price elasticities of demand in countries that have implemented the facility. This increase in price elasticities may be a result of a reduction in switching costs between operators. On average, the introduction of MNP increases own-price elasticities by 0.47 in absolute value. We compare the level of price elasticities before and after the implementation of MNP in Ghana and Kenya, which implemented this policy in the time period of our study. Our results suggest that in Ghana, MNP increased own-price elasticities by an average of 0.35 in absolute terms from an average value across firms and over time of -0.74. In Kenya, the introduction of MNP increased own-price elasticities by an average of 0.21 in absolute terms from a lower average value across firms and over time of -0.39. However, we find that in Kenya and Ghana the average own-price elasticities remained small even after the implementation of MNP relative to other countries without MNP in place. Thus, our results suggest that MNP is not the ultimate solution for increasing competitiveness within the mobile industry. While in Chapter 3 we use a product differentiated model of demand, in Chapter 4 we make assumptions that allow us to use a homogenous model of demand to examine the effect of regulatory policies on mobile retail prices. Using aggregated quarterly data for eight African countries for the period 2010:Q4 to 2014:Q4, we estimate structural demand and supply equations. We find that mobile termination rates (MTR) have a significant positive impact on mobile retail prices. A decline in average MTR of 10% decreases average mobile retail prices by 2.5%. On the other hand, MNP has an insignificant effect on price and subscriptions in selected African countries. This may be due to inadequate implementation of MNP, which subsequently lead to low demand for porting numbers. The average market conduct in the mobile telecommunications industry for selected African countries can be approximated by Cournot Nash equilibrium. In Chapter 4 we find price elasticities that are closer to 1 in absolute terms. The price elasticity, however, is estimated at an average of -0.27 for Sub-Saharan Africa countries in Chapter 4. We attribute this inconsistency to the different assumptions made in each chapter.

Bluetooth and Radio Frequency Identification (RFID) are two technologies which are used in lots of contexts today, for example Bluetooth is used for communication between devices and RFID as identification of items at storehouses. This work contains a comparison between those two technologies in a time tracking environment for sports events. To compare the two technologies, a Bluetooth time tracking prototype based on Raspberry Pi 3 and Android Sony Xperia M5 were developed to be compared with a preexisting RFID timing system. The work has been done at Blekinge Institute of Technology in Karlskrona. An agile project form has been used in the work containing a prestudy, development, verification, experimentation and survey phase. The survey focused on smartphones for timing, and the experiments were qualitative. Three of the questions that have been answered during the work are, if Bluetooth could be used in a timing context, what are the difference in reading performance at different speeds and distances. In both unobstructed and blocked Bluetooth can be read at longer distances. Both systems can read tags at 30 kilometers an hour close to the readers. / Bluetooth och Radio Frequency Identification (RFID) är två vanliga teknologier som användsi stor utsträckning idag, till exempel Bluetooth används för bland annat kommunikation mellan enheter, medans RFID används bland anatt för identifiering av objekt i lagerlokaler. Detta arbetet jämför teknologierna utifrån ett tidtagnings perspektiv för olika idrottslopp. För jämförelsen mellan teknologierna utvecklades en Bluetooth tidtagnings prototyp baserat på en Raspberry Pi 3 och en smartphone applikation, och för RFID användes ett redan utvecklat tidtagningssystem. Arbetet har utförts på Blekinge Tekniska Högskola i Karlskrona. Ett iterativt arbetssätt hara nvänts under arbetes gång innefattande en förstudie, utveckling, verifikation, experiment ochen enkätfas. Enkäten fokuserade på smartphones för tidtagning och experimenten som utfördes var av kvalitativ karaktär. Två av forskningsfrågorna som blivit besvarade under arbetet är om Bluetooth kan användas för tidtagning och om det går, vad är skillnaden på prestandan i låga respektive höga hastigheter på olika avstånd? Några av resultaten från arbetet är att i fri sikt kan Bluetooth bli läst på längre avstånd än RFID. Båda systemen kan läsa av taggar upp till 30 kilometer i timmen nära läsaren.

El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. / This article proposes a work method reform in the production line of self-supporting telecommunication towers of a Peruvian metalworking enterprise. The problem raised considers the cost overruns caused by the delivery and dispatch of incomplete tower kits. The main process evaluated is the assembly of tower kits, which presented multiple deficiencies that we analyzed with multiple engineering tools using the eight steps of practical process improvement. We evaluated by a large scale definition the work table in the assembly and stacking of parts, defining by specific zones each part type and profile, and optimizing the total process times so as not to affect the scheduled dispatches. Thus, it is possible to minimize the number of customer returns.

El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. / Over the years, the telecommunications sector has steadily grown in the last ten years while gaining relevance in the global market. Management of the supply chain generates various risks and complications, and many industries seek effective supply chain operation methods to meet their variable requirements. The objective of this research is to propose a supply-chain model focused on on-time delivery compliance with substantial support of knowledge management methodologies. The research study yielded a 91% increase in compliance from the given scenario.

En el presente trabajo se describe el análisis que se ha realizado para poder transformar la red LAN de un centro de datos tradicional, líder en servicios de Outsourcing en el Perú, en una infraestructura de red basada en software, el cual, va a ayudar a mejorar los tiempos de entrega de los servicios de red; así como, incrementar el índice de disponibilidad de ésta. La empresa en estudio, actualmente, tiene tres centros de datos ubicado en dos distritos de la ciudad de Lima, como la Molina y San Isidro, la gerencia en el Perú mediante la unidad de negocio Global Technology Services (GTS), responsable de los centros de datos en el país, está liderando este cambio tecnológico que traerá consigo una revolución en el mercado de centro de datos en el país. En este documento se encuentra el diseño de alto y bajo nivel de la red bajo la tecnología de software defined network (SDN) que se va a proponer, también los beneficios en tiempo que toma implementar una red LAN usando esta tecnología, adicionalmente, el equipamiento de red que se propone para este diseño; y, por último, el análisis económico que muestra la justificación de implementar esta nueva red bajo software defined network. Finalmente, se hacen las recomendaciones que se deben seguir si se desea implementar una red LAN basada en software, tanto para un centro de datos, como para un campus; así como, las ventajas si se toma la decisión de implementarla. / This paper describes the analysis that has been carried out to transform the LAN network of a traditional data center, leader in Outsourcing services in Peru, into a software-based network infrastructure, which, will help improve delivery times for network services; as well as increase its availability index. The company under study currently has three data centers located in two districts of the city of Lima, such as La Molina and San Isidro, the management in Peru through the Global Technology Services (GTS) business unit, responsible for the centers of data in the country, is leading this technological change that will bring about a revolution in the data center market in the country. This document contains the high and low level design of the network under the defined network software (SDN) technology that is going to be proposed, as well as the benefits in time it takes to implement a LAN using this technology, additionally, the equipment network proposed for this design; and, finally, the economic analysis that shows the justification for implementing this new network under defined network software. Finally, recommendations are made that should be followed if you want to implement a software-based LAN network, both for a data center and for a campus; as well as the advantages if the decision is made to implement it. / Tesis