La présente étude concerne le domaine des systèmes de transmission par fibres optiques et plus particulièrement l’impact des différentes techniques de filtrage (optiques) sur les performances des systèmes de transmission optiques (métro, accès). En réception, ces systèmes présentent un filtre étroit, qui permet de filtrer le signal sans avoir à traiter le bruit dans la liaison. On considère généralement que l'étroitesse du filtre de réception est indispensable au bon fonctionnement d'une liaison sans répéteurs, et que la sensibilité de la liaison est d'autant plus grande que la largeur du filtre est proche de la limite théorique que constitue la largeur du spectre du signal émis. L'utilisation de tels filtres présente des contraintes. D'une part, les filtres présentent des pentes raides, et sont coûteux. D'autre part, un décalage de la longueur d'onde de l'émetteur est toujours possible, de sorte que la plupart des récepteurs comprennent des filtres de réception dont la longueur d'onde est asservie sur la longueur d'onde de l'émetteur. Pour un système de transmission à multiplexage en longueurs d'onde WDM, dans lequel plusieurs longueurs d'ondes distinctes peuvent être utilisées, ceci permet d’augmenter la capacité d’information transmise, mais pose cependant de réelles contraintes telle que la diaphonie entre voies. Les canaux sont multiplexés dans la même fibre puis filtrés à la réception par un filtre optique qui sert à la fois au démultiplexage des canaux et à un éventuel filtrage optique dans le spectre du canal étudié. Le filtre optique aura des paramètres variables : forme, bande passante, et longueur d’onde centrale, ensuite le canal ainsi filtré sera analysé par le récepteur. Ce dernier comprend une photodiode suivie d’un filtre électrique de la forme de la fonction de filtrage de type de Bessel d’ordre 5. La qualité de l’information sera évaluée, par le taux d’erreur binaire TEB. Dans ce travail de thèse nous proposons une analyse de l’impact des paramètres fondamentaux des filtres sur les performances d’une liaison par la simulation système. / This study relates to the field of optical transmission systems fibers and more particularly the impact of different filtering techniques (optical) on the performance of optical transmission systems (metro access). Reception, these systems have a narrow filter, which filters the signal without having to deal with the noise in the link. It is generally considered that the narrowness of the receiving filter is indispensable for the proper functioning of a link without repeaters, and the sensitivity of the link is even greater than the width of the filter is close to the theoretical limit that is the spectrum width of the transmitted signal. The use of such filters has constraints. Firstly, the filters have steep slopes, and are expensive. On the other hand, a shift of the wavelength of the emitter length is always possible, so that most of the receivers comprise receiving filters whose wavelength is locked to the wavelength of the transmitter. For a transmission system with wavelength multiplexing, wherein plural different wavelengths may be used, this allows to increase the capacity of information transmitted, but however poses real constraints such that crosstalk between channels. The channels are multiplexed in the same fiber and filtered upon receipt by an optical filter which is used both in the channels and demultiplexing a possible optical filter in the spectrum of the considered channel. The optical filter has variable parameters: shape, bandwidth, and center wavelength, then the channel will be filtered and analyzed by the receiver. It includes a photodiode followed by an electrical filter of the form of the filter function of order Bessel type 5. Quality information will be evaluated by the bit error rate BER.In this thesis we propose to analyze the impact of the fundamental parameters of the filters on the performance of an optical system.

I kursen Examensarbete i Integrerad produktutveckling på Högskolan i Skövde har under våren 2017 ett produktutvecklingsprojekt för Kinnarps utförts av designingenjörsstudenterna Eva Henriksson och Sofie Johansson. Kinnarps är ett företag som tillverkar möbler för offentliga miljöer och vill nu i samband med deras nya satsning, att utveckla utformningen av hur lärmiljöer ser ut, ta fram ett höj- och sänkbart elevbord anpassat för årskurs 4-9. Under projektet användes och utvärderades också QFD – Quality Function Deployment som ett verktyg för att identifiera och uppfylla rätt kundbehov. Förstudien och användandet av QFD innebar bland annat att genomföra intervjuer och observationer av användare och målgruppen, identifiera trender i lärmiljöer, utföra konkurrentanalyser, utvärdera och vikta kundbehov samt att översätta behoven till kvalitéer som gick att uppfylla.Förstudien visade på att bordets viktigaste kvaliteter att uppfylla var att det skulle vara flexibelt, mobilt, tyst och enkelt att justera.Konceptutvecklingen inleddes med att identifiera och utvärdera olika höj- och sänkmekanismer. Därefter påbörjades konceptgenerering som utfördes med hjälp av olika kreativitetsmetoder. Koncepten utvärderades och sållades kontinuerligt under processen efter hur väl de uppfyllde kundbehoven samt genom användartester och återkoppling med målgruppen. Inför konceptvalet återstod till sist två koncept. Beslutet av det slutliga konceptet grundades i hur väl det uppfyllde de identifierade kundbehoven.Resultatet blev ett bord som uppfyller de ställda kraven och passar väl in i de lärmiljöer som finns idag men är också anpassat för hur lärmiljöer troligtvis kommer se ut i framtiden. Bordet har den funktionalitet som efterfrågades av användarna samtidigt som det har en utformning som är unik och tilltalande. / During the spring semester of 2017 a product development project has been carried out by two Design Engineering Students, Eva Henriksson and Sofie Johansson, in cooperation with Kinnarps. Kinnarps is a company who develops and sells furniture for public environments and as they are now focusing on the development of how educational spaces are formed and furnished they wanted to develop a height adjustable student desk for pupils between the ages of 10 to 16. To be able to reassure whether the correct customer requirements were identified and fulfilled in the right way QFD – Quality Function Deployment was used and analyzed as a part of the project. The use of QFD during the pre-study included, amongst other things, the execution of interviews and observations of users and the target group, performing competitive analyses, looking into trends , evaluate and weighing the importance of different needs and translating those into measureable specifications.The pre-study showed that needs like mobility, flexibility, simple adjustment and that the table should be as quiet as possible were the most important ones.The concept generation phase started by identifying and evaluating different options of height adjustment mechanisms. Creativity methods were used to generate ideas on how different parts of the table could be constructed. The generated concepts were then evaluated and screened continuously by looking on how well they fulfilled the customer requirements and through user tests and feedback from the target group. Two concepts remained before the final selection. The choice between these two concepts were based on to which extend each of them fulfilled the customer requirements. The final design of the table fulfills the requirements that were set and fits well into the educational spaces as they are formed today and how they probably will be designed in the future. The functionality that were requested by the users have been fulfilled while the table still has a unique and appealing look.

Orientador: Hugo Enrique Hernandez Figueroa / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação / Made available in DSpace on 2018-08-22T03:58:50Z (GMT). No. of bitstreams: 1 Moraes_MuriloOliveirade_M.pdf: 26552033 bytes, checksum: 9a9022f8aa6d5e4e72047f0798ad57da (MD5) Previous issue date: 2013 / Resumo: A complexidade dos sistemas eletrônicos atuais cria a demanda por mais componentes num mesmo sistema, ao mesmo tempo em que exige sistemas mais compactos. Esta dissertação apresenta o desenvolvimento, fabricação e testes de uma antena GSM quadribanda, integrada a um módulo rastreador automotivo produzido no mercado nacional. A antena opera dentro das faixas de freqüências correspondentes _as bandas GSM 850/900/1800/1900, com desempenho adequado para uso no sistema de comunicação GSM, estando em conformidade com testes de TRP, sendo o produto final homologado pela ANATEL e agências reguladoras de outros países. A antena é um monopolo com dobras especiais para ajuste de ressonância. O casamento da antena com o sistema _e realizado via um toco em curto dobrado, não trivial, otimizado para um casamento banda-larga ao longo do espectro GSM ocupado / Abstract: The complexity of today's electronic systems creates demand for more quantity and less cost of components in a system, at the same time that the system must be made smaller. This dissertation presents the design and tests of a quadband GSM antenna, embedded into an existing automotive tracking module produced in Brazil. The antenna operates within the GSM 850/900/1800/1900 bands, with performance suitable for its use in the GSM system, being in conformance with TRP tests. The final product is approved by Brazil's regulatory agency ANATEL and by other countries' agencies. The antenna is a monopole with special bandings for resonance adjustment. The antenna matching is achieved with a shorted bent stub, non-trivial, optimized for a broadband matching over the occupied GSM spectrum / Mestrado / Telecomunicações e Telemática / Mestre em Engenharia Elétrica

Aim of this work is description of design and manufacturing by welding technology of adjustable runner blades circle of Kaplan turbine. For designing and its subsequent strength control using the finite element method were performed with using static analysis in the program SolidWorks ® 2013. Material of adjustable runner blades circle's parts was designed S 355 J2 G3, which is able to withstand a given load. In the design of technology of welding there was elected MAG-welding method, with the active gas mixture Ar +18% CO2. Additive material for welding will be OK Autrod 12.51, like it‘s marked by ESAB s.r.o. For each weld is necessary to create the welding edge, which is made on computer controlled machining machines. In the production we require strict adherence to the prescribed workflow and compliance with WPS protocol. After welding and machining of adjustable runner blades circle we will make weld test, visual examination, dye penetrant and ultrasonic examination.

The master thesis deals with design of the fully differential frequency filters working in the current mode and is focused on possibilities of the natural frequency and the quality factor adjustment. At the beginning, there is a brief description of frequency filters and active elements (MO-CF, FD-CF and DACA), which are used in the thesis. Furthermore, simplified signal flow graphs design method and transformation of passive and active elements to the differential structures are described. The designs of four differential circuitries which provide possibility of tuning the natural frequency or quality factor by the gain of the DACA element are shown in the thesis. Simulation results made in OrCAD program with help of third-order models are included. The practical implementation of the differential frequency filter for tuning of the natural frequency by the DACA elements is shown in the last chapter.

Master thesis concerns with a design of forklift truck. The result proposed in the thesis uses existing technologies but combines them in new context to gain better qualities of a lift truck especially in relation to user-friendliness and ergonomics. Shaping works on functional demands which are understood as a basis for further developments towards the aesthetical outcome.

This dissertation deals with design of self adjustable discharge valve used in Emerson reciprocating compressors. This work contains research of current state of knowledge, technical analysis of the valve and calculations of basis parameters. Constructional proposal is then presented. Part of the dissertation is manufacturing of prototype and its test. Finally, conclusions for further development are made.

This thesis deals with the fractional (1+)-order filters. The proposed filters operate in the current-mode. The derivation of the filters has been achieved using a third-order aproximation of the coresponding fractional-order transfer functions. It also describes active elements such as universal current conveyor, current follower and operational transconductance amplifier. In the end of this thesis some new circuit solutions of the fractional-order filter are proposed. Then the proposed filters are realized and experimentally measured.

With the increasingly prevalent use of robots, this paper presents the design and evaluation of a multifunctional Unmanned Ground Vehicle (UGV) with an adjustable suspension system, overmolding omni-wheels, and a unique tool head pick-up mechanism. The UGV addresses current adaptability, performance, and versatility limitations across various industries, including agriculture, construction, and surveillance. The adjustable suspension system enhances the UGV's stability and adaptability on diverse terrains, and the overmolding omni-wheels improve maneuverability and durability in off-road conditions. The tool head pick-up mechanism allows for the seamless integration of various tools, enabling the UGV to perform multiple tasks without manual intervention. A comprehensive performance evaluation assessed the UGVs' versatility, load capacity, passability, and adaptability. The results indicate that the proposed UGV design successfully addresses current limitations and has the potential to revolutionize various applications in different industries. Further research and development are necessary to optimize the UGV's performance, safety, and cost-effectiveness. / Thesis / Master of Applied Science (MASc)

Human-controlled robots are utilized in many situations and such use is becoming widespread. This thesis details research that allows a single human to interact with a team of robots performing tasks that require cooperation. The research provides insight into effective interaction design methods and appropriate interface techniques. The use of team-level autonomy is shown to decrease human workload while simultaneously improving individual robot efficiency and robot-team cooperation. An indoor human-robot interaction testbed was developed at the BYU MAGICC Lab to facilitate experimentation. The testbed consists of eight robots equipped with wireless modems, a field on which the robots move, an overhead camera and image processing software which tracks robot position and heading, a simulator which allows development and testing without hardware utilization and a graphical user interface which enables human control of either simulated or hardware robots. The image processing system was essential for effective robot hardware operation and is described in detail. The system produced accurate robot position and heading information 30 times per second for a maximum of 12 robots, was relatively insensitive to lighting conditions and was easily reconfigurable. The completed testbed was utilized to create a game for testing human-robot interaction schemes. The game required a human controlling three robots to find and tag three robot opponents in a maze. Finding an opponent could be accomplished by individual robots, but tagging an opponent required cooperation between at least two robots. The game was played by 11 subjects in five different autonomy modes ranging from limited robot autonomy to advanced individual autonomy with basic team-level autonomy. Participants were interrupted during the game by a secondary spatial reasoning task which prevented them from interacting with the robots for short periods of time. Robot performance during that interruption provided a measure of both individual and team neglect tolerance. Individual robot neglect tolerance and performance did not directly correspond to those quantities at the team level. The interaction mode with the highest levels of individual and team autonomy was most effective; it minimized game time and human workload and maximized team neglect tolerance.