Dissertations / Theses on the topic 'Radio controller'
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Kim, Seonghyun. "Detecting Contextual Network Anomaly in the Radio Network Controller from Bayesian Data Analysis." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180442.
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This thesis presents Bayesian approach for a contextual network anomaly detection. Network anomaly detection is important in a computer system performance monitoring perspective. Detecting a contextual anomaly is much harder since we need to take the context into account in order to explain whether it is normal or abnormal. The main idea of this thesis is to find contextual attributes from a set of indicators, then to estimate the resource loads through the Bayesian model. The proposed algorithm offers three advantages. Firstly, the model can estimate resource loads with automatically selected indicators and its credible intervals. Secondly, both point and collective contextual anomalies can be captured by the posterior predictive distribution. Lastly, the structural interpretation of the model gives us a way to find similar nodes. This thesis employs real data from Radio Network Controller (RNC) to validate the effectiveness in detecting contextual anomalies.
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Larsson, Joachim. "CPU Load Control of LTE Radio Base Station." Thesis, Linköpings universitet, Reglerteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123499.
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A radio base station (RBS) may become overloaded if too many mobile devices communicate with it at the same time. This could happen at for instance sport events or in the case of accidents. To prevent CPU overload, the RBS is provided with a controller that adjusts the acceptance rate, the maximum number of connection requests that can be accepted per time interval. The current controller is tuned in real radio base stations and the procedure is both time consuming and expensive. This, combined with the fact that the mobile data usage is predicted to increase puts more pressure on today's system. Thus, there is a need to be able to simulate the system in order to suggest an alternative controller. In this thesis, an implementation of the system is developed in Matlab in order to simulate the RBS system load control behaviour. A CPU load model is estimated using system identification. The current version of the CPU load controller and an alternative PI CPU load controller are implemented. Both are evaluated on different test cases and this shows that it is possible to increase the performance of the system with the alternative CPU load controller, both in terms of lower amount of rejected connection requests and decreased CPU load overshoot.
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Гриненко, Віталій Вікторович, Виталий Викторович Гриненко, Vitalii Viktorovych Hrynenko, and А. А. Дунь. "Контролер репітера УКВ радіостанцій." Thesis, Сумський державний університет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46200.
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Контролер ретранслятора (репітера) радіосигналу призначений для спільної роботи з радіостанціями УКВ діапазону. При розробці і експлуатації пристрою необхідно враховувати перешкоди, які зумовлені як взаємним впливом приймача та передавача, так і промислові (ефірні) перешкоди. Одним з джерел ефірних перешкод можуть бути телевізійні антени.
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Grundberg, Staffan. "Radio Netwok Test Configuration for Maximum Test Coverage : Model based load generation in system verification of a GSM Base Station Controller." Thesis, Linköpings universitet, Kommunikationssystem, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-82023.
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GSM has been developed during more than a decade and has grown to a very complex system. Due to the wide range of functionality, the high capacity and the complexity of the BSC the testing of stability and performance is time consuming. A simulator is needed for these tests as live networks are not available at this stage in the development process. The performance and stability need to be verified for each new release of functionality. This thesis describes a conceptual model of a GSM network. The conceptual model can be used to configure a simulated radio network and to communicate what is simulated on a conceptual level rather than a detailed level. The model presented consists of several sub models. The subscriber model describes the actions and movement of subscribers; the cell model describes the radio conditions experienced by a subscriber moving within one cell; and the cell network model describes the geographical and structural properties of the network. Together the models are used to compose scenarios with the aim to describe varying radio conditions, varying subscriber behavior and varying cell structures. The aim is that different features of the Ericsson base station controller shall be used in the different scenarios. The scenarios represent different parts of a radio network connected to the same base station controller.
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Roshanghias, Daniel. "Evaluation and Implementation of a Longitudinal Control in a Platoon of Radio Controlled Vehicles." Thesis, KTH, Reglerteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212564.
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Over the past decades, congestion and emission problems has increased remarkablywhich escalates the demands on vehicles. The advancements withinthe eld of information and communication systems gives the opportunity todeal with the aforementioned problems. The concept of platooning shows tobe an attractive way of reducing both congestion and emissions by having ashort inter-vehicle spacing. The ndings in studies show that fuel reductionpotentials of 5-20 % are viable as a result of the lowered air drag by drivingin platoon. This thesis investigates the state of the art within the areaof intelligent transport systems (ITS) along with advanced driver assistancesystems (ADAS). Furthermore, the prosecuted work results in a proposedcontrol design for a longitudinal control in a platoon of vehicles. The platoonconsists of two homogeneous radio controlled vehicles (RCV) which aremodelled by taking advantage of system identication methods. The identi-ed plant models are implemented into a Simulink model where the controlsystem is developed. Moreover, the developed control system is implementedinto a real-time demonstrator for experimental evaluation. The results showsthat the modelled dynamics corresponds reasonably well with the real dynamicsof the system. The developed control system proves to work well andagree with the expectations of its performance obtained from simulations.The performance of the proposed controller has been evaluated by means ofsimulations and real experiments. The resulting control system consists ofPID controllers for both speed and spacing control.Under de senaste decennierna har mangden trakstockningar och problemmed utslapp okat - darmed aven kraven pa vara fordon. Samtidigt skaparframstegen inom informations- och kommunikationssystem mojligheter foratt hantera ovannamnda problem. Kolonnkorning, eller platooning har visatsig vara en eektiv metod for att minska saval trakstockningar som utslappsom en foljd av kortare avstand mellan fordon. Resultat fran studier visarhur en branslereduktion runt 5-20 % ar mojlig till foljd av det sankta luftmotstandet vid kolonnkorning. Avhandlingen undersoker teknikens standpunktinom intelligenta transportsystem (ITS) tillsammans med avancerade drivhjalpsystem(ADAS). Vidare resulterar arbetet i ett forslag till regleringsdesignfor en longitudinell kontroll i en kolonn av fordon. Kolonnen bestar av tvahomogena radiostyrda fordon (RCV) som modelleras genom att utnyttjametoder for systemidentiering. De identierade systemmodellerna implementerasi en Simulink-modell dar styrsystemet utvecklas. Dessutom implementerasdet utvecklade styrsystemet i en realtids-demonstration for experimentellutvardering. Resultaten visar att den modellerade dynamikenstammer bra overens med systemets verkliga dynamik. Det utvecklade styrsystemetvisar sig fungera bra och overensstammer med forvantningarna pa dessprestanda som erhallits genom simuleringar. Den foreslagna regulatorns prestandahar utvarderats med hjalp av simuleringar och verkliga experiment.Det resulterande styrsystemet bestar av PID regulatorer for bade hastighetsochavstandskontroll.
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Aruchamy, Logabharathi. "Analysis of Radio Access Network Buffer Filling Based on Real Network Data." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6063.
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The 3G and 4G networks have drastically improved availability and quality in data transmission for bandwidth hungry services such as video streaming and location-based services. As 3G networks are very widely deployed, there exists increased capacity requirement and transport channel allocation to simultaneous users under a particular cell. Due to this reason, adequate resources are not available, which in turn degrades both service quality and user experienced quality. This research aims at understanding the characteristics of buffer filling during dedicated channel (DCH) transmission under fixed bit-rate assumptions on a per-user level taking different services into consideration. Furthermore, the resource utilisation in terms of empty buffer durations and user throughput achieved during dedicated channel transmission are also analysed for different data services existing in the mobile networks. The traces are collected from a real network and characteristics of the traffic are analysed prior to understanding its buffer filling in Radio Network Controller (RNC) during downlink data transmission. Furthermore, the buffer is modelled with some series of assumptions on channel bit-rates and simulations are performed taking single user scenario into consideration, for different services with the help of obtained traces as input to the buffer. This research is helpful in understanding the RNC buffer filling for different services, in turn yielding possible understanding on the existing transport channel switching scenario. With the help of analysing the buffer filling for different services and transport channel utilisation, we learn that most of the data services show low DCH utilisation of approximately around 20% and also found to have 80% of the total DCH session duration with empty buffer, causing sub-optimal radio resource utilization.
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Subramanians, Sankar Saravanan. "Geo-based Mobility Control for Mobile Traffic Simulators." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-101979.
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Most mobile traffic simulators of today depend on the user to supply the mobility behavior of the simulated UEs. This becomes a problem when certain wanted mobility characteristics are to be tested, since the user have to go trough a trial-and-error procedure to come up with the proper mobility behavior. This thesis presents two approaches to mobility control, where the aim is to control UE mobility based on certain mobility characteristics supplied by the end user. The first approach introduces the concept of assigning tasks to UEs, e.g. “cross cell border†or “move to a certain cellâ€. Furthermore, concepts from control theory are borrowed to control the task assignment process, making it more dynamic and robust. The second approach iteratively calculate movement patterns for the UEs in an area until it finds a movement pattern that has a high probability of satisfying the user’s requested mobility characteristics.
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Nordström, Edward, and Johan Hollander. "Design och implementering av enhandsburen RFID-läsare." Thesis, Jönköping University, JTH, Computer and Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-6752.
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Radio frequency identification (RFID) is a versatile wireless technology usedworldwide. The fields of applications are many and its popularity constantlygrows due to smaller in size, better and less expensive components. RFID isused to identify, track or share information about an object using radio waves.
This master thesis describes the process of designing and implementing ahandheld UHF RFID reader. The goal was to, based on a UHF RFID-chipdesign a fully functional, small in size and power efficient device. Amicrocontroller provides the user interface and is also used to control theRFID-chip and a Bluetooth device. A Bluetooth- and GPRS-compatible mobilephone will be used to forward data to a server connected to the Internet. Allparts of the design are described, such as the printed circuit board design aswell as the software for the micro controller and the mobile phone.
Because the extent of this thesis it is neither possible nor necessary to dig toodeep into the Bluetooth- or GPRS-protocol. The focus will be on designingsoftware and hardware for the handheld unit.
Radio frekvens identifiering (RFID) är en mångsidig trådlös teknik somanvänds över hela världen. Områdena där tekniken används är många och dess popularitet växer konstant tack vare mindre storlek, bättre och billigarekomponenter. RFID används för att identifiera, spåra eller dela med siginformation om ett objekt med radiovågor.
Det här examensarbetet beskriver processen av design och implementering aven handburen UHF RFID läsare. Målet har varit att, baserat på ett UHF-RFIDchip, designa en fullt fungerande, liten och strömsnål enhet. En microcontroller förser dels användaren med ett användargränssnitt och sköter delskommunikationen med RFID chip och en blåtandsmodul. En blåtands- ochGPRS- eller 3G-kompatibel mobiltelefon används for att skicka vidare data tillen server kopplad till Internet. Alla delar av designen är beskrivna, så som PCB design, mjukvara för micro controllern och mobiltelefonen.
På grund av omfattningen av det här examensarbetet så har det inte varitmöjligt eller nödvändigt att gräva för djupt i Blåtands- eller GPRS/3Gprotokollen. Fokus är på att designa hårdvara och mjukvara för den handhållna enheten.
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Шищак, Володимир Романович, and Vladimir Shishak. "Розробка та дослідження автоматизованої системи проведення теплових випробувань радіотехнічної апаратури." Master's thesis, Тернопіль, ТНТУ, 2019. http://elartu.tntu.edu.ua/handle/lib/29776.
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Роботу виконано на кафедрі ком’пютерно-інтегрованих технологій Тернопільського національного технічного університету імені Івана Пулюя Міністерства освіти і науки України Захист відбудеться 26 грудня 2019 р. о 12 .30 годині на засіданні екзаменаційної комісії № 45 у Тернопільському національному технічному університеті імені Івана Пулюя за адресою: 46001, м. Тернопіль, вул.Руська, 56, навчальний корпус №1, ауд. 401Шищак В.Р. Розробка та дослідження автоматизованої системи проведення теплових випробувань радіотехнічної апаратури. – Тернопільський національний технічний університет імені Івана Пулюя. – Тернопіль, 2019. В даній магістерській роботі розроблено та досліджено автоматизовану систему проведення термовипробувань радіотехнічної апаратури, складено технічні умови на виготовлення продукту і наявного устаткування, вибрано принципи дії обладнання, загальна компоновка та склад системи, розроблено загальні алгоритми роботи обладнання. Камера ТИК-20/80-УХЛ призначена термовипробовувань РЕА по заданій програмі в нормальних умовах та при умові підвищеної вологості повітря, з метою визначення впливу на характеристики РЕА підвищеної температури та вологості. В дипломному проекті автоматизовано процеси термовипробуваня РЕА для одиничного та дрібносерійного типу виробництва з можливістю задання режимів роботи як по функціям часу та температури, та з контролем вологості атмосфери в об’ємі камери. Камера ТИК-20/80-УХЛ дозволяє проводити термообробку виробів за допомогою впливу на них підвищених температур, та проводити автоматичну реєстрацію показів характеристик РЕАє Shishak V.R.. Development and research of an automated system for conducting thermal tests of radio engineering equipment. - Ternopil National Technical University named after Ivan Puluj. - Ternopil, 2019. In this master's work the automated system of carrying out thermal tests of radio engineering equipment is developed and investigated, the technical conditions for the manufacture of the product and the available equipment are drawn up, the principles of equipment operation, the general layout and system composition, the general algorithms of the equipment operation are developed. The TIK-20/80-UHL camera is intended for thermal tests of REA according to the set program in normal conditions and under conditions of high humidity, in order to determine the influence on the characteristics of REA of high temperature and humidity. The diploma project automates the processes of thermal testing of REA for single and small-scale production with the ability to set operating modes as functions of time and temperature, and with the control of atmospheric humidity in the volume of the camera. The TIK-20/80-UHL camera allows for heat treatment of products by the influence of high temperatures on them, and for automatic recording of readings of REA's characteristics.
ВСТУП................................................................................................................... 1 ОГЛЯД ЛІТЕРАТУРИ........................................................................... 1.1 Температурні випробувальні і кліматичні випробувальні камери................ 1.2 Кліматичні камери серії WK111..................................................................... 1.3 Температурні камери серії KWP..................................................................... 1.4 Температурні камери малого об’єму серії DU............................................... 1.5 Температурні і кліматичні камери великого об’єму моделі DU і SD........ 1.6 Температурні камери зі збільшеною швидкістю охолодження і нагрівання 5°С/хв ................................................................................................... 1.7 Камера шокового температурного впливу..................................................... 1.8 Керування і програмування SІMCON/32....................................................... 2 ТЕХНОЛОГІЧНА ЧАСТИНА.......................................................................... 2.1. Характеристика виробу та його призначення............................................... 2.1.1. Аналіз конструктивно-технологічних особливостей виробу та технологічних особливостей його виготовлення.................................................. 2.1.2 Технологічні вимоги до проектованого пристрою .................................... 2.2 Розробка технологічного процесу виготовлення виробу ............................ 2.2.1 Технологічні операції підготовки. .............................................................. 2.2.2 Лудження і оплавлення друкованих плат................................................... 2.2.3 Використання технолігії “Методу прямих відрізків” ............................... 2.3 Вимоги до технологічності, уніфікації й стандартизації ........................... 3 КОНСТРУКТОРСЬКА ЧАСТИНА.................................................................. 3.1 Принцип дії...................................................................................................... 3.2 Захист пристрою............................................................................................. 3.3 Вказання заходів безпеки............................................................................... 3.4 Порядок монтажу ........................................................................................... 3.5 Підготовка виробу до роботи......................................................................... 3.6 Розробка функціональної схеми – встановлення складу та призначення функціональних вузлів. ........................................................................................ 3.7 Розробка електронної принципової схеми мікропроцесорної системи керування ................................................................................................................ 3.7.1 Вибір елементів ОЗП та ПЗП, розрахунок необхідного об’єму пам’яті, опис основних характеристик.................................................................. 3.7.2 Вибір елементів для організації системної шини, їх призначення та характеристики....................................................................................................... 3.7.3 Вибір пристроїв вводу-виводу, їх організація та призначення............... 3.8 Розрахунок надійності.................................................................................. 3.9 Розрахунок вібростійкості............................................................................ 4. Науково-дослідна частина………………..…............................................. 4.1. Аналіз технології .......................................................................................... 4.1.1 Аналіз технологічності конструкції ................................................... 4.1.2 Розрахунок показників технологічності .................................................... 4.1.3 Обгрунтування вибору технологічного устаткування для виробництва модуля........................................................................................ 4.1.4 Обгрунтування основних режимів роботи обладнання........................... 4.2 Призначення виробу........................................................................................ 4.3 Технічні характеристики................................................................................. 4.4 Будова пристрою ............................................................................................. 5 Спеціальна частина………………………………………................................ 5.1.Загальні відомості про систему команд ........................................................ 5.2 Група команд пересилання даних .................................................................. 5.3 Група команд арифметичних операцій ......................................................... 5.4 Група команд логічних операцій.................................................................... 5.5 Група команд операцій з бітами ..................................................................... 5.6. Група команд передачі керування ................................................................ 6.Обгрунтування економічної ефективності ……….......................................... 6.1 Інноваційна політика підприємства та наукові принципи її формування 6.2Планування технічної підготовки виробництва проектованого приладу. 6.2.1. Визначення трудомісткості і обсягу робіт конструкторської підготовки виробництва........................................................................................ 6.2.2. Визначення трудомісткості та обсягу робіт технологічної підготовки виробництва........................................................................................................... 6.3. Визначення економічної ефективності нового приладу.............................. 6.3.1. Розрахунок затрат на виготовлення і використання нового приладу...... 6.3.2. Розрахунок економічного ефекту від виготовлення і експлуатації приладу................................................................................................................... 6.4. Техніко-економічні показники порівнюваних варіантів............................ 6.5. Висновки і пропозиції .................................................................................. 7 Охорона праці та безпеки в надзвичайних ситуаціях................................ 7.1 Правила безпеки при експлуатації обладнання, що проектується................ 7.2 Розробка заходів які зменшують небезпеку виникнення вибухів і пожеж в цеху що проектується.............................................................................. 7.3 Розрахунок евакуаційних шляхів із виробничих приміщень (дільниці) цеху що проектується............................................................................................. 7.4 Розрахунок природнього освітлення для проектованої дільниці............. 8 Екологія………………………………………………....................................... 8.1 Шкідливий вплив від технологічного процесу, що використовується..... 8.2 Джерела забруднення свинцем..................................................................... 8.3. Вплив свинцю на здоров'я населення............................................................ 8.4 Основні заходи по зниженню надходження свинцю в навколишнє середовище і його впливу на здоров'я населення................................................. 8.5 Заходи зі зменшення викидів свинцю у атмосферу....................................... ВИСНОВОК .......................................................................................................... ПЕРЕЛІК ПОСИЛАНЬ......................................................................................... ДОДАТКИ ............................................................................................................
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Päärni, Anna. "Designing a Voice Controlled Interface For Radio : Guidelines for The First Generation of Voice Controlled Public Radio." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-136894.
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From being a fictional element in sci-fi, voice control has become a reality, with inventions such as Apple's Siri, and interactive voice response (IVR) when calling your doctor's office. The combination of radio’s strength as a hands-free medium, public radio’s mission to reach across all platforms and the rise of voice makes up a relevant intersection; voice controlled public radio in Sweden. This thesis has aimed to investigate how radio listeners wish to interact using voice control to listen to on-demand radio content. Additionally, what does public radio need to consider when implementing the UX for voice control? A questionnaire, Google Analytics-data from Sveriges Radio’s mobile app and website, and an interview with National Public Radio were used to determine four initial functions voice controlled on-demand. The functions were turned into four scenarios, used as the basis for a workshop and brainstorming session. Three of these scenarios were then selected to be the foundation for a Wizard of Oz-prototype, which six users evaluated. The results indicate that to create a viable voice user interface (VUI) for radio, there needs to be a profile for the user to create a personalized experience, with filtered searches created by user behaviour and preference settings. The VUI also needs to allow synonyms for program names, as well as keyword tag material for clustering similar material and to enable personalized user searches. This keyword-system can further be utilized to give user recommendations based on behaviour and preferences. A companion application with a graphical user interface (GUI) can be used for such functionality as settings, help, queuing and creating playlists. Finally, the system needs to ensure that the users are taken care of and guided. A radio host can be used as a basis for the system's persona, to create a consistent and familiar interface. Aspects to examine in the future are more extensive user testing for the VUI design, filter bubbles, ensuring that the user data is not misused or leaked, dimensions of the system's persona, the future of radio and the progress of IPAs.
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Rasmussen, Nichlas. "Operator unit simulator." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-45676.
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Detta examensarbete utfördes som ett uppdrag av Atlas Copco där målet var att utveckla en programvara som kan simulera en OU (Operator Unit) i en PC miljö. Atlas Copcos egenutvecklade radiostyrningssystem för gruvfordon består av en sändare, kallad OU, och en mottagare, kallad MU (Machine Unit). En OU är en kontroller med reglage i form av knappar, joysticks och switchar och med indikatorer i form av LEDs och display. För att säkerställa att en OU endast kan kommunicera med en specifik MU och vice versa måste enheternas radiomoduler paras ihop genom en process som kallas ”learn link”, som görs genom att ansluta en CAN-kabel mellan enheterna. Genom att använda en OU simulator vid MU produktionstest skulle det vara lättare att utföra vissa tester, såsom internfel och varningar, och det skulle vara möjligt att inkludera tester som är omöjliga att göra med en hårdvaru-OU, som att avsiktligt sända en felberäknad checksumma, för att undersöka MU-enhetens respons. OU simulatorn skulle ha ett grafiskt gränssnitt och genom att ansluta ett radiokort till PC:n skulle den kunna skicka och ta emot data från en MU. Den skulle också kunna utföra ”learn link”. Den färdiga produkten utvecklades med hjälp av C# och en XP-inspirerad utvecklingsmetod.This thesis was developed as an assignment from Atlas Copco where the goal was to develop software that could simulate an OU (Operator Unit) in a PC environment. Atlas Copco’s proprietary radio-control system for mining vehicles consists of a transmitter, called OU, and a receiver, called MU (Machine Unit). An OU is a controller with controls in the form of buttons, joysticks and switches and with indicators in the form of LEDs and display. To ensure that an OU only can communicate with a specific MU and vice versa the units’ radio modules must be paired together through a process called “learn link”, that is performed by connecting the units with a CAN-cable. By using an OU simulator for MU production tests it would be easier to perform some tests, such as internal errors and warnings, and it would be possible to include tests that are impossible to do with OU hardware, such as intentionally send a miscalculated checksum, to examine the MU’s response. The OU simulator should have a graphical user interface and by connecting a radio card to the PC it should be able to send and receive data from an MU. It should also be able to perform “learn link”. The final product was developed using C# together with an XP-inspired development method.
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Wachanga, David Ndirangu O'Connor Brian C. "Sanctioned and controlled message propagation in a restrictive information environment the small world of clandestine radio broadcasting /." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-5113.
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Hintze, Charles J. "Construction and use of a radio controlled model helicopter research." Thesis, Monterey, California. Naval Postgraduate School, 1985. http://hdl.handle.net/10945/21223.
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Mach, Tomasz Henryk. "Autonomously controlled terminal mobility in self-organising radio access network." Thesis, University of Surrey, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.659109.
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This thesis examines the mechanisms improving user terminal mobility in a wireless cellular network. It addresses the problem of the lack of self-organisation in the cell reselection algorithms used in the mobile radio access networks. This mechanism is an autonomous terminal mobility procedure used when moving between cells. This work refers to the practical examples of the evolution of cellular teclmologies specified by 3rd G~neration Partnership Project (3 GPP). FUlthermore, this thesis is based on the detailed system analysis of the cell reselection procedure, aiming to identifY areas where the system could be improved by the application of the self-organising design approach. It studies how the performance of the cell measurements mechanism, allowing a tenninal mobility in the network could be increased by using the self-organising concept, in terms of the better cell reselection performance and the terminal energy efficiency trade-off. The main goal of these improvements is providing better quality of service, enhanced user experience and increased network operational performance while minimising maintenance costs. The main contributions of this thesis can be summarised as follows. Firstly, it investigates the autonomously controlled user terniimil mobility, its drawbacks, and limitations during the mobility between macro cells. Then, techniques increasing the energy efficiency of the terminal, without compromising the system performance during the cell reselection, are identified. Also, signalling protocol aspects during the cell reselection algorithm are studied and performance improvements are proposed. Furthermore, an evaluation and optimization of the cell reselection performance is undeltaken, considering different system level and user experience criteria. It draws on simulation results to analyse the serving cell quality, mobility measurements effOli impacting terminal energy efficiency and the related performance trade-offs. Finally, a selforganising approach based framework, with a practical example of the possible mechanism allowing a cost efficient self-optimization ofthe autonomously controlled mobility is proposed. Key words: Cell Reselection, Energy Efficiency, Land Mobile Radio Cellular Systems, Neighbour Cells Measurements, Radio Access Network, Radio Resource Control Protocol, SelfOrganising Networks
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LJUDÉN, ERIK OLOV. "Autonomous Hover Control System for a Radio-Controlled Aerobatic Airplane." Thesis, KTH, Mekatronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233143.
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Being able to fly has always been one of humanities greatest dreams, and today anyone can purchase a Radio-Controlled (RC) airplane or helicopter and learn how to fly. Experienced RC pilots perform stunts such as “prop hanging”. This is when an airplane flies vertically while maintaining its position with the propeller being the only motive force. In this thesis, the first steps towards converting a manually controlled hovering airplane to an autonomous one are taken by using one single accelerometer to measure differences in acceleration as input data for a height regulator. A built prototype with the height regulator implemented is tested in a test rig. The finished regulator is able to adjust and keep the airplane stable when exposed to small to medium disturbances. The regulator’s biggest weakness is the lack of input data regarding the velocity. Big disturbances result in a constant velocity, which gives zero acceleration input data, and an airplane flying away from its equilibrium position.Att kunna flyga har alltid varit en av mänsklighetens största drömmar och idag kan vem som helst köpa ett radiostyrt flygplan eller helikopter och lära sig att flyga. Erfarna piloter som flyger radiostyrda flygplan utför konster som att ”hänga i propellern”, vilket innebär att flygplanet flyger vertikalt samtidigt som den behåller sin position där propellern är den enda drivkraften. I den här avhandlingen tas det första steget att konvertera ett manuellt styrt hovrande flygplan till ett autonomt genom att använda en enda accelerometer för att mäta skillnaden i acceleration som indata för en höjdregulator. Ett byggt prototypflygplan med höjdregulatorn implementerad testas i en testställning. Den färdiga regulatorn fungerar och kan justera och hålla flygplanet stabilt när den utsätts för små till medelmåttiga störningar. Regulatorns största svaghet är bristen på indata av hastigheten. Stora störningar resulterar i konstant hastighet, vilket ger noll acceleration som indata och ett flygplan som flyger ifrån sitt jämviktsläge.
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Ljudén, Erik Olov. "Autonomous Hover Control System for a Radio-Controlled Aerobatic Airplane." Thesis, KTH, Maskinkonstruktion (Inst.), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230584.
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Being able to fly has always been one of humanities greatestdreams, and today anyone can purchase a Radio-Controlled(RC) airplane or helicopter and learn how to fly. ExperiencedRC pilots perform stunts such as “prop hanging”.This is when an airplane flies vertically while maintainingits position with the propeller being the only motive force.In this thesis, the first steps towards converting a manuallycontrolled hovering airplane to an autonomous one aretaken by using one single accelerometer to measure differencesin acceleration as input data for a height regulator.A built prototype with the height regulator implementedis tested in a test rig. The finished regulator is able toadjust and keep the airplane stable when exposed to smallto medium disturbances. The regulator’s biggest weaknessis the lack of input data regarding the velocity. Big disturbancesresult in a constant velocity, which gives zeroacceleration input data, and an airplane flying away fromits equilibrium position.Att kunna flyga har alltid varit en av mänsklighetens störstadrömmar och idag kan vem som helst köpa ett radiostyrtflygplan eller helikopter och lära sig att flyga. Erfarna pilotersom flyger radiostyrda flygplan utför konster som att”hänga i propellern”, vilket innebär att flygplanet flygervertikalt samtidigt som den behåller sin position där propellernär den enda drivkraften. I den här avhandlingen tasdet första steget att konvertera ett manuellt styrt hovrandeflygplan till ett autonomt genom att använda en endaaccelerometer för att mäta skillnaden i acceleration som indataför en höjdregulator. Ett byggt prototypflygplan medhöjdregulatorn implementerad testas i en testställning. Denfärdiga regulatorn fungerar och kan justera och hålla flygplanetstabilt när den utsätts för små till medelmåttigastörningar. Regulatorns största svaghet är bristen på indataav hastigheten. Stora störningar resulterar i konstanthastighet, vilket ger noll acceleration som indata och ettflygplan som flyger ifrån sitt jämviktsläge.
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Bennett, David William. "The design and performance of automatically-controlled feedforward amplifiers." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296590.
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Wachanga, David Ndirangu. "Sanctioned and Controlled Message Propagation in a Restrictive Information Environment: The Small World of Clandestine Radio Broadcasting." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc5113/.
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This dissertation seeks to identify the elements that inform the model for competing message propagation systems in a restrictive environment. It pays attention to message propagation by sanctioned and clandestine radio stations in pre- and post-independent Zimbabwe. This dissertation uses two models of message propagation in a limiting information environment: Sturges' information model of national liberation struggle and Chatman's small world information model. All the message propagation elements in the Sturges and Chatman's models are present in the broadcast texts analyzed. However, the findings of this dissertation indicate that communication in a restrictive information environment is designed such that its participants make sense of their situation, and come up with ways to solve the challenges of their small world. Also, a restrictive information environment is situational, and message propagators operating in it are subject to tactical changes at different times, accordingly altering their cognitive maps. The two models fail to address these concerns. This dissertation focused on message propagation in Zimbabwe because there is military belligerence involved in the information warfare. It therefore provides an extreme situation, which can help our understanding of more everyday instances of communication and interference of communication. Findings of this dissertation recommend the need to emphasize that information input, output and suppression are components dependent on each other; not discrete and independent categories of information activities.
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Moore, Jacqueline M. (Jacqueline Michele). "A system for landing an autonomous radio controlled helicopter on sloped terrain." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/49917.
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Kim, Taeik. "A CMOS tunable transmission line phase shifter and voltage-controlled oscillator for wireless communications /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/6131.
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Winter, Lukas. "Detailing radio frequency controlled hyperthermia and its application in ultrahigh field magnetic resonance." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2014. http://dx.doi.org/10.18452/17012.
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Die vorliegende Arbeit untersucht die grundsätzliche Machbarkeit, Radiofrequenzimpulse (RF) der Ultrahochfeld (UHF) Magnetresonanztomographie (MRT) (B0≥7.0T) für therapeutische Verfahren wie die RF Hyperthermie oder die lokalisierte Freigabe von Wirkstoffträgern und Markern zu nutzen. Im Rahmen der Arbeit wurde ein 8-Kanal Sened/Empfangsapplikator entwickelt, der bei einer Protonenfrequenz von 298MHz operiert. Mit diesem weltweit ersten System konnte in der Arbeit experimentell bewiesen werden, dass die entwickelte Hardware sowohl zielgerichtete lokalisierte RF Erwärmung als auch MR Bildgebung und MR Thermometrie (MRTh) realisiert. Mit den zusätzlichen Freiheitsgraden (Phase, Amplitude) eines mehrkanaligen Sendesystems konnte aufgezeigt werden, dass der Ort der thermischen Dosierung gezielt verändert bzw. festgelegt werden kann. In realitätsnahen Temperatursimulationen mit numerischen Modellen des Menschen, wird in der Arbeit aufgezeigt, dass mittels des entwickelten Hybridaufbaus eine kontrollierte und lokalisierte thermische Dosierung im Zentrum des menschlichen Kopfes erzeugt werden kann. Nach der erfolgreichen Durchführung dieser Machbarkeitsstudie wurden in theoretischen Überlegungen, numerischen Simulationen und in ersten grundlegenden experimentellen Versuchen die elektromagnetischen Gegebenheiten von MRT und lokal induzierter RF Hyperthermie für Frequenzen größer als 298MHz untersucht. In einem Frequenzbereich bis zu 1.44GHz konnte der Energiefokus mit Hilfe spezialisierter RF Antennenkonfigurationen entscheidend weiter verkleinert werden, sodass Temperaturkegeldurchmesser von wenigen Millimetern erreicht wurden. Gleichzeitig konnte gezeigt werden, dass die vorgestellten Konzepte ausreichende Signalstärke der zirkular polarisierten Spinanregungsfelder bei akzeptabler oberflächlicher Energieabsorption erzeugen, um eine potentielle Machbarkeit von in vivo MRT bei B0=33.8T oder in vivo Elektronenspinresonanz (ESR) im L-Band zu demonstrieren.The presented work details the basic feasibility of using radiofrequency (RF) fields generated by ultrahigh field (UHF) magnetic resonance (MR) (B0≥7.0T) systems for therapeutic applications such as RF hyperthermia and targeted drug delivery. A truly hybrid 8-channel transmit/receive applicator operating at the 7.0T proton MR frequency of 298MHz has been developed. Experimental verification conducted in this work demonstrated that the hybrid applicator supports targeted RF heating, MR imaging and MR thermometry (MRTh). The approach offers extra degrees of freedom (RF phase, RF amplitude) that afford deliberate changes in the location and thermal dose of targeted RF induced heating. High spatial and temporal MR temperature mapping can be achieved due to intrinsic signal-to-noise ratio (SNR) gain of UHF MR together with the enhanced parallel imaging performance inherent to the multi-channel receive architecture used. Temperature simulations in human voxel models revealed that the proposed hybrid setup is capable to deposit a controlled and localized RF induced thermal dose in the center of the human brain. After demonstrating basic feasibility, theoretical considerations and proof-of-principle experiments were conducted for RF frequencies of up to 1.44GHz to explore electrodynamic constraints for MRI and targeted RF heating applications for a frequency range larger than 298MHz. For this frequency regime a significant reduction in the effective area of energy absorption was observed when using dedicated RF antenna arrays proposed and developed in this work. Based upon this initial experience it is safe to conclude that the presented concepts generate sufficient signal strength for the circular polarized spin excitation fields with acceptable specific absorption rate (SAR) on the surface, to render in vivo MRI at B0=33.8T or in vivo electron paramagnetic resonance (EPR) at L-Band feasible.
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Gallagher, Michael James. "Development of telemetry for the agility flight test of a radio controlled fighter model." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23639.
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Approved for public release; distribution is unlimitedAdvanced design tools, control devices, and supermaneuverability concepts provide innovative solutions to traditional aircraft design trade-offs. Emerging technologies enable improved agility throughout the performance envelope. Unmanned Air Vehicles provide an excellent platform for dynamic measurements and agility research. A 1/8-scaled F-16A ducted-fan radio-controlled aircraft was instrumented with a telemetry system to acquire angle of attack, sideslip angle, control surface deflection, throttle position, and airspeed data. A portable ground station was built to record and visually present real-time telemetry data. Flight tests will be conducted to acquire baseline high angle-of-attack performance measurements, and follow-on research will evaluate agility improvements with varied control configurations.
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Bauer, Zachary Obenour. "A Calibration Method for a Controlled Reception Pattern Antenna and Software Defined Radio Configuration." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1357402542.
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Durrant, Andrew J. "Model-based control of air/fuel ratio for spark ignition engines." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287232.
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Aden, Hassan Abdullahi, and Källqvist Rasmus Karlsson. "Evaluating LoRa Physical as a Radio Link Technology for use in a Remote-Controlled Electric Switch System for a Network Bridge Radio-Node." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-247895.
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This report explores the design of a system for remotely switching electronics on and off within a range of at least 15 km, to be used with battery driven radio nodes for outdoor Wi-Fi network bridging. The application of the network bridges are connecting to remote networks, should Internet infrastructure fail during an emergency.The problem statement for the report was “What is a suitable radio link technology for use in a remote controlled electrical switch system and how should it best be put to use?” To answer the question, delimitation was done to exploring Low Power Wide Area Network (LPWAN) link technologies, due to their prior use within power constrained devices.Long Range-radio, abbreviated LoRa, is a LPWAN radio modulation technique and was determined to be a good candidate as a suitable link technology for the remote electrical switch system. The range of LoRa is achieved by drastically lowering the data rate of the transmission, and is suitable for battery-powered or energy harvesting devices such as those found in the field of Internet of Things.A LoRa-based transmitter and receiver pair was implemented, and measured to have a packet delivery ratio of over 95% at a distance of 2 km, measured between two bridges. Data at further distances could not be accurately determined, because of the LoRa transceiver giving faulty readings.No conclusion could be made about the suitability for using a LoRa based system to solve the problem, partially due to an improper method for testing the radio performance was used, and partially due to an inconclusive measurement result.Denna rapport utforskar designen av ett system för att fjärrstyrt slå på eller av elektronik över ett avstånd på minst 15 km, för att användas med batteridrivna radionoder för nätverksbryggning utomhus med Wi-Fi. Tillämpningsområdet för nätverksbryggorna är att koppla samman avlägsna nätverk, om Internetinfrastruktur skulle sluta fungera vid en nödsituation.Problemställningen för rapporten var ”Vad är en lämplig radiolänksteknik att använda i ett fjärrstyrt elektriskt strömbrytarsystem, och hur ska det bäst brukas?”. För att svara på frågan gjordes en avgränsning att utforska Low Power Wide Area Network (LPWAN)-länktekniker, på grund av deras tidigare användning inom effektbegränsade enheter.Long Range-radio, förkortat LoRa, är en radiomodulationsteknik som används för att skicka data över långa avstånd med energibegränsade enheter. LoRa:s räckvidd uppnås genom att drastiskt sänka datatakten, och lämpar sig för bruk i batteridrivna eller energiskördande enheter, likt de som återfinns inom fältet Internet of Things.Ett LoRa-baserat sändaroch mottagarpar implementerades, och uppmättes till att ha en paketlevereringsmängd på över 95% vid ett avstånd på 2 km, mätt mellan två broar. Data vid större avstånd kunde inte bli bestämt noggrant, eftersom LoRa transceivern gav felaktiga avläsningar. Ingen slutsats kunde göras för lämpligheten för att använda ett LoRa-baserat system för att lösa problemet, delvist för att en olämplig metod för att testa radions prestanda använts, och delvist på grund av ett ofullständigt mätresultat.
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Лисенко, Дмитро Сергійович. "Методи формування цифрового потоку для систем широкосмугового радіодоступу." Doctoral thesis, Київ, 2013. https://ela.kpi.ua/handle/123456789/3337.
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Silva, Junior José Mairton Barros da. "Radio resource management for single and two-hop device-two-device communications." reponame:Repositório Institucional da UFC, 2014. http://www.repositorio.ufc.br/handle/riufc/11072.
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SILVA JUNIOR, J. M. B. Radio resource management for single and two-hop device-two-device communications. 2014. 77 f. Dissertação (Mestrado em Engenharia de Teleinformática) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2014.Submitted by Marlene Sousa (mmarlene@ufc.br) on 2015-03-24T14:24:35Z No. of bitstreams: 1 2014_dis_jmbsjunior.pdf: 3507288 bytes, checksum: dd069660650553cfc46ce8d0dcef716f (MD5)
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The increasing demand for fast multimedia services and the scarcity of electromagnetic spectrum has motivated the research of technologies able to increase the capacity of wireless systems without requiring additional spectrum. In this context, Device-to-Device (D2D) communication represents a promising technology. By enabling direct and low-power communication among devices, D2D communication leads to an increased and intelligent spatial reuse of radio resources allowing to offload the data transport network. As a result, the overall system capacity and specially the spectral efficiency is increased; and the proximity between devices allows data transfer with low delays and high rates without requiring extra power from devices’ batteries. However, in order to realize the potential gains of D2D communications as a secondary network of the cellular (primary) one, some key issues must be tackled. Assuming that the communicating devices are aware of each other, the actual link (channel) conditions must be evaluated. If beneficial, Radio Resource Management (RRM) techniques would be employed so that the co-channel interference caused in cellular devices would be mitigated. Such techniques may be summarized as: grouping, mode selection, and power control. In this thesis, I focus my attention on the RRM for D2D communications underlaying a Long Term Evolution (LTE)-like network, and the main RRM techniques to mitigate the co-channel interference. Aiming at the reduction of the intra-cell interference and at the improvement of spectral efficiency, I formulate a joint grouping and power allocation problem. However, due to its complexity I propose suboptimal methods to group cellular and D2D User Equipments (UEs) with the goal of minimizing intra-cell interference, taking into account spatial orthogonality between the UEs that share the same resources. In addition, I analyze methods to decide if D2D-capable UEs should communicate directly to one another or in the conventional way via the Evolved Node B (eNB). The results show that D2D communications can improve the spectral efficiency of the system and that most of this improvement can be achieved by suitably grouping the UEs for sharing resources based on successive orthogonal projections and matching different spatial compatibility metrics. Moreover, in this thesis I argue that D2D technology can be used to further increase the spectral and energy efficiency if the key D2D RRM algorithms are suitably extended to support network assisted multi-hop D2D communications. Specifically I propose a novel, distributed utility maximizing power control (PC) scheme that is able to balance spectral and energy efficiency while taking into account mode selection and resource allocation constraints that are important in the integrated cellular-D2D environment. The analysis and numerical results indicate that multi-hop D2D communications combined with the proposed PC scheme can be useful not only for harvesting the potential gains previously identified in the literature, but also for extending the coverage of cellular networks
O aumento da demanda por serviços ricos em multimídia e a escassez do espectro eletromagnético têm motivado a pesquisa de tecnologias capazes de aumentar a capacidade de sistemas sem fio sem requerer espectro adicional. Nesse contexto, comunicações Dispositivo-a-Dispositivo (D2D, do inglês Device-to-Device) representam uma tecnologia promissora. Ao permitir comunicação direta e de baixa potência entre os dispositivos, comunicações D2D levam a um maior e mais inteligente reuso dos recursos de rádio, permitindo um descongestionamento da rede de transporte de dados. Como resultado, a capacidade total do sistema e especialmente a eficiência espectral são aumentadas; e a proximidade entre os dispositivos permitem transferências de dados com baixo atraso e altas taxas de dados, sem requerer potência extra da bateria dos dispositivos. Entretanto, com o objetivo de tornar real os potenciais ganhos de comunicações D2D como uma rede secundária da celular (primária), algumas questões chave precisam ser controladas. Assumindo que os dispositivos se comunicando estão cientes um do outro, a condição do enlace (canal) deve ser avaliada. Caso seja benéfica, técnicas de Gestão de recursos de rádio (RRM, do inglês Radio Resource Management) são empregadas para que a interferência co-canal causada nos dispositivos celulares seja mitigada. Tais técnicas podem ser resumidas como: agrupamento, seleção de modo e controle de potência. Nessa dissertação, eu foco a minha atenção para RRM em comunicações D2D subjacentes a redes LTE, e para as principais técnicas de RRM para mitigar a interferência co-canal. Objetivando a redução da interferência intra-celular e na melhoria da eficiência espectral, eu formulo um problema conjunto de agrupamento e controle de potência. Entretanto, devido à sua complexidade eu proponho métodos sub-ótimos para agrupar usuários celulares e D2D com o objetivo de minimizar a interferência intra-celular, levando em conta a ortogonalidade espacial entre os usuários que compartilham o recurso. Além disso, eu analiso métodos para decidir se um candidato D2D deveria se comunicar diretamente ou de modo convencional através da estação rádio-base (eNB, do inglês Evolved Node B). Os resultados mostram que comunicações D2D conseguem melhorar a eficiência espectral do sistema e que a maioria dos ganhos pode ser alcançada agrupando de forma adequada os usuários para compartilhar recursos baseando-se em projeções sucessivas e ortogonais, assim como combinando diferentes métricas de compatibilidade espacial. Além disso, nessa dissertação eu argumento que tecnologias D2D podem ser usadas para aumentar ainda mais a eficiência espectral e energética se os parâmetros chave dos algoritmos de RRM forem adequadamente estendidos para comunicações D2D em múltiplos saltos. Especificamente, eu proponho um novo algoritmo distribuído de controle de potência baseado em maximização da utilidade que é capaz de equilibrar eficiência espectral e energética, enquanto leva em consideração a seleção de modo e restrições na alocação de recursos inerentes à integração do ambiente celular-D2D. Os resultados numéricos mostram que comunicações D2D em múltiplos saltos combinadas com o algoritmo de controle de potência proposto são úteis não apenas para colher os potenciais ganhos identificados na literatura, mas também para estender a cobertura de redes celulares
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Goulart, Marcelo Magalhães. "Monitoração de controle de Tilt e Azimute das antenas de estações radio base da telefonia celular." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263578.
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Orientador: Kamal Abdel Radi IsmailDissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: A partir dos meados dos anos 90, com o surgimento da telefonia celular analógica e posteriormente digital, o número de usuários da telefonia celular aumenta vertiginosamente e em 2004 já supera no Brasil o número de telefones fixos, 54 milhões de celulares e 49 milhões de telefones fixos (Dados Teleco de Junho/2004). Este trabalho descreve de uma forma geral a proposta do desenvolvimento de um protótipo elétrico/eletrônico e mecânico de um sistema de monitoração e controle de inclinação (Tilt) e coordenação (Azimute) das antenas das estações rádio base da telefonia celular, facilitando-se desta forma enormemente a otimização da infra-estrutura já existente das operadoras de telefones portáteis. O estudo se baseia na utilização de microcontroladores para a realização de controle e monitoração dos sensores de inclinação e azimute instalados na simulação de uma estrutura de torre de uma estação rádio base (ERB)
Abstract: Starting from the middles of the nineties, with the appearance of the analogical mobile telephone and later digital, the number of users of the cellular mobile telephone increases vastly and in 2004 it already overcomes in Brazil the number of fixed telephones, 54 million of cellular mobile telephone and 49 million telephones fixed (Data from Teleco jun/2004).This work describe the proposal of the development of a prototype electric/electronic and mechanic of a monitoring and control system of inclination (Tilt) and coordination (Azimuth) of the antennas of the stations radio-base of the mobile telephone, being facilitated this way vastly the optimization of the infrastructure already existent of the operators of telephones mobile. The study if it bases on the microcontrollers use for accomplishment of control and monitoring of the sensor of inclination and azimuth installed in the simulation of a structure of tower of a station radio base (ERB)
Mestrado
Instrumentação e Controle Industrial
Mestre Profissional em Engenharia Mecanica
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Mallqui, Morales Nayda Isabel. "Diseño de migración de nodos B aplicado para una RNC caida de una red movil." Bachelor's thesis, Universidad Ricardo Palma, 2015. http://cybertesis.urp.edu.pe/handle/urp/1276.
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La presente tesina consiste en el diseño de migración de nodos B aplicado para una RNC caída de una red móvil, con la finalidad de solucionar los problemas que se presenten ante un incidente que afecte los servicios de voz y datos de los usurarios de una red móvil.
En el desarrollo de la tesina, se describe el planteamiento del problema, el marco teórico de la tecnología UMTS y posteriormente nos centramos en los elementos principales de esta tecnología. También describimos los equipos importantes a utilizar en desarrollo del proyecto, en este caso nos enfocamos en la descripción de la RNC. Y finalmente describimos el desarrollo del proyecto, el diseño de la solución e implementación de la misma, y en donde se presentan los resultados del diseño.
This thesis is the design of migration of nodes B and its a applied when RNC fall for a mobile network, in order to solve the problems that arise before an incident affecting voice and data services from a mobile network.
In developing the thesis, we describe the theoretical framework of UMTS technology and then we focus on the main elements of this technology. We also describe the important equipment used in project development; in this case we focus on the description of the RNC. And finally we describe the solution of design and implementation .Also, the results of this project.
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Choi, Byungcho. "Large signal transient analysis of duty ratio controlled DC-to-DC converter." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43966.
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The large-signal transient response of duty ratio controlled dc-to-dc converters is investigated using the phase-plane technique. The transition pattern of large-signal trajectories is provided in terms of the circuit parameter and operating conditions. Several transient trajectories of practical interest including start-up, step input voltage change and step-load change are analyzed. The effect of large-signal characteristics of the feedback controller on the transient trajectory is presented.Master of Science
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Ike, Amanda. "TAILORING BRANCHING FOR POLY (ARYLENE ETHER)S VIA REACTIVITY RATIO CONTROLLED POLYMERIZATIONS." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1189267130.
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Typpö, Jukka. "Noise tolerant voltage-controlled LC oscillator circuits for deep submicron VLSI system-on-a-chip radio circuits." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-121.
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This thesis studies the problems with maintaining the spectral purity of fully integrated VCO circuits for radio frequency synthesizers in single-chip system designs. LC tank circuit oscillator circuits are shown to convert amplitude variation in the tank circuit voltage into frequency modulation, if voltage dependent capacitances are present in the tank circuit. Since the parasitic capacitances of the gain transistors and the capacitance of the varactor device in a VCO circuit are voltage dependent, any interfering signal, that is able to modulate the amplitude of the VCO tank circuit voltage waveform, is converted to FM sidebands in the output signal spectrum. It is also shown that the AM-FM conversion may be prohibited under some conditons.
A new method for simulating the steady-state voltage waveform of an LC tank circuit oscillator is presented. In this method, one complete oscillation cycle is simulated piecewise, employing the known solution of the damped harmonic motion equation. The voltage-dependent parameters of the equation are updated in the beginning of each segment. The steady state is found by matching the initial conditions and the final conditions of one complete oscillation cycle, using a numerical optimization algorithm. The method avoids finding the solution of the differential equation with variable coefficients.
For minimizing the sensitivity of integrated VCO circuits to the intra-chip noise sources, this work proposes minimizing the AM-FM conversion by designing the VCO in the way that the voltage dependent capacitances of the oscillator core circuit are made to cancel each other’s effects on the oscillation frequency at some amplitude level. Experimental results demonstrate 15 dB suppression of the sidebands due to the modulated tail current noise in a negative-Gm spiral inductor PFET VCO circuit. The varactorless prototype circuit is implemented in a 0.35 µm CMOS technology. The measured tuning range of the 3 GHz back gate tuned VCO circuit is 10 %, and the current consumption of the core circuit is 2.5 mA. The phase noise level is -110 dBc at 500 kHz offset frequency.
The last part of this thesis discussses the problems with modeling and characterizing small MOS transistors, and presents characterization of 28 µm wide MOSFSET devices. A new method for extracting the drain and source electrode resistances from the measured Z22 response is presented. The response is measured at a constant and very low signal frequency, with Vds = 0 V and with various gate-source bias voltage values. At low signal frequencies, the equivalent diagram of the MOSFET is dramatically simplified, since all parasitic capacitors of the device may be ignored. Consequently, the number of degrees of freedom in the curve fitting is reduced to only two.
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Shan, Chunling. "Natural and Controlled Source Magnetotelluric Data Processing and Modeling." Doctoral thesis, Uppsala universitet, Geofysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-229917.
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In this thesis, four studies using different geophysical electromagnetic methods are presented. In the first study dealing with airborne measurements, the noise response due to the rotation of the aircraft and the aircraft itself as a metallic conductive body on the Earth's electromagnetic response in very low frequency and low frequency band was investigated. The magnetic fields are independent of the aircraft in the VLF band and part of the LF band. But at higher frequencies (above 100 kHz), the signals are more influenced by the aircraft. The aircraft also generates its own noise frequencies which are mixed with the radio transmitter signals. The second and third studies are applications of radio-, controlled source-magnetotellurics and electrical resistivity tomography methods at a quick-clay landslide site in southwest Sweden. The data are processed and modeled in 2D and 3D, and the models are compared with high-resolution seismic and geotechnical data. The obtained results were further validated and refined by performing synthetic tests in the second study. The third study shows that the 3D models provide larger and more continuous volume of the quick clay structure than traditional 2D models. Both studies have shown that integrated application of geophysical methods for landslides is ideal. Quick clays often overlie the coarse-grained layers showing an increase of resistivity values in the models. In the fourth study, a new audio magnetotelluric data acquisition technique is developed and is named moving magnetotellurics (MMT). In this new technique, the magnetic sensors are placed on the ground and only 15 to 20 minutes data are acquired for each station, which usually is enough to cover the frequency range 30-300 Hz. The new technique is more efficient and convenient than the traditional magnetotelluric method, and test measurements have shown that it is an applicable method in shallow depth studies.
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Gao, Jie, Zhibo Pang, Qiang Chen, and Li-Rong Zheng. "Interactive Packaging Solutions Based on RFIDTechnology and Controlled Delamination Material." KTH, Elektroniksystem, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-50193.
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Interactive packaging is an emerging research area in recent years. It brings people convenient and smart lives, reduces consumption of traditional packaging materials and direct or indirect labor costs as well. Being integrated in interactive packaging, Radio Frequency Identification (RFID) technology becomes one of the most proactive development enablers. In this paper, an interactive and intelligent packaging solution integrating passive RFID system and Controlled Delamination Material (CDM) is given at first. Package opening action is electrically controlled by the RFID system. CDM is primarily used in aerospace applications in the past and the conductor/adhesive joint can be easily opened by applying a little electric power on to the material. Some related works will be shown about the electrochemical characteristics of CDM in order to facilitate the system design. A demonstration system was developed and the test results have proved feasibility of the solution and shown the potential of low cost for mass production. Based on this solution, an interactive medication package for pervasive healthcare is further developed, using EPCglobal Gen2 RFID technology. It will make the medication being accessible for patient only at the prescribed dose and time, and medication taking information will be delivered as well. Such medication package will not only give unprecedented high patient compliance, but also improve the communication between patients and healthcare staffs.QC 20111202
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Boakye, Godfred. "REACTIVITY RATIO CONTROLLED POLYCONDENSATION AS A ROUTE TO SYNTHESIZE FUNCTIONAL POLY(ARYLENE ETHER)S." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1421085447.
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Casciato, Carmine Davide. "On the choice of gestural controllers for musical applications : an evaluation of the Lightning II and the Radio Baton." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112329.
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This thesis evaluates the Lightning II and the Radio Baton gestural controllers for musical applications within two main perspectives. The first involves a technical specification of each in terms of their construction and sensing technology. This step, along with an analysis of the insights by long-term users on the controllers in question, provides an understanding about the different musical contexts each controllers can be and have been used in. The second perspective involves studying the Radio Baton and the Lightning within a specific musical context, namely that of a simulated acoustic percussion instrument performance. Three expert percussionists performed basic percussion techniques on a real drum, a drum-like gestural controller (the Roland V-Drum), the Radio Baton and the Lightning II. The motion capture and audio data from these trials suggest that certain acoustic percussion playing techniques can be successfully transferred over to gestural controllers. This comparative analysis between gestural controllers adds to the ongoing discussion on the evaluation of digital musical instruments and their relationship to acoustic instruments.
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Rocha, Magno Fernandes da. "Estudo e desenvolvimento da plataforma de simulação do canal de controle digital do sistema movel TDMA." [s.n.], 2000. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259803.
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Orientador: Renato Baldini FilhoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Este trabalho apresenta um estudo detalhado dos vários canais lógicos que compõem o canal de controle digital (DCCH) de um sistema de comunicações móveis TDMA (Acesso Múltiplo por Divisão Temporal). O estudo do DCCH é realizado a partir da descrição da estrutura de camada fisica, de camada 2 e dos estados de operação da estação móvel na camada 3 e também dos modelos de referência de protocolo DCCH da BMI (Estação Base, Centro de Chaveamento Móvel e Função de 1nteroperação) e da estação móvel. A principal meta deste trabalho é a elaboração de um programa computacional para a simulação do diagrama de estado da camada 3 do DCCH, através da implementação dos procedimentos executados pela estação móvel em um sistema TDMA 18-136. O estudo e a simulação do DCCH permitem compreender o funcionamento de uma estação móvel assim que ela é ligada, passando a requisitar ou a receber serviços do sistema TDMA 18-136
Abstract: This work presents a detailed study of the various logical channels that compose the digital control channel (DCCH) of a TDMA (Time Division Multiple Access) mobile communication system. The DCCH study is made from the description of the physical layer, the layer 2 and the mobile station operation state in the layer 3 structure. The HMI (Base Station, Mobile Switching Center, and Interworking Function) and mobile station DCCH protocol reference models are also treated. The main objective of this work is the development of a simulation software for the DCCH layer 3 state diagram, through the implementation of the invoked procedures by the mobile station in the IS-136 TDMA system. The study and the simulation ofthe DCCH allow understanding how a mobile station works when it is powered up and initializes to require or to provide services to/from the IS-136 TDMA system
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
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Gong, Fei. "Front End Circuit Module Designs for A Digitally Controlled Channelized SDR Receiver Architecture." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1322606039.
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Victoria, Adilson Fernando. "Interferencia de canal adjacente como função dos parametros de propagação e distribuição de trafego em sistemas radio moveis celulares." [s.n.], 1993. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261555.
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Orientador : Michel Daoud YacoubDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica
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Resumo: Este trabalho apresenta o estudo em bases estatísticas da interferência de canal adjacente como função dos parâmetros de propagação e distribuição de tráfego em sistemas rádio 17Wveis celulares. Neste estudo, considera-se a indefinição entre as fronteiras de células vizinhas, com a existência de áreas de sobreposição determinadas pelos parâmetros de propagação, onde unidades móveis podem experimentar comunicações adequadas com mais de uma estação rádio base. Este fato permite a aplicação de técnicas de encaminhamento alternativo sobre o tráfego gerado nestas áreas de sobreposição, o que resulta em um melhor desempenho de tráfego do sistema, ou seja, um melhor grau de serviço. No entanto, como as técnicas de encaminhamento alternativo modificam a distribuição das taxas de ocupação dos canais, causando uma concentração destes nas áreas fronteiriças das células, tem-se a contrapartidado aumento do níveis de interferências presentes no sistema. Este é um fato relevante, pois na tentativa de se melhorar o grau de serviço do sistema pode ocorrer a degradação da qualidade de transmissão para além de um nível aceitável,sendo possível tornar inviável a operação deste sistema. A probabilidade de interferência de canal adjacente é estudada sob os pontos de vistas da estação rádio base e da unidade móvel, considerando-se os ambientes rádio móveis com desvanecimentos caracterizados pelas distribuições Log-Norm.alouRayleigh, em conjunto com a aplicação de técnicas de encaminhamento alternativo sobre o tráfego considerado flexível
Abstract: Not informed.
Mestrado
Mestre em Engenharia Elétrica
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Lopes, Júnior Luizmar da Silva. "Parâmetros de controle da resistência mecânica de solos tratados com cal, cimento e rocha basáltica pulverizada." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/11804.
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Cada vez mais freqüente a utilização de técnicas tradicionais da engenharia geotécnica depara-se com obstáculos de caráter econômico e ambiental. A técnica do solo-cal torna-se atrativa quando o melhoramento das propriedades do solo do local constitui-se numa alternativa de projeto. A técnica de tratamento de solos com cal encontra aplicação, por exemplo, na construção de bases para pavimentos, na proteção de taludes em barragens de terra e como camada de suporte para fundações superficiais. Entretanto, ainda não existem metodologias de dosagem e projeto das misturas de solo-cal baseadas em critérios racionais como existe no caso do concreto, onde a relação água/cimento desempenha papel fundamental na obtenção da resistência desejada. Nesse sentido, este estudo tem por objetivo quantificar a influência da quantidade de cal, da porosidade e do teor de umidade de moldagem, sobre a resistência de um solo arenoso tratado com cal e rocha basáltica pulverizada, avaliar a adequação do uso das relações água/cal e vazios/cal na estimativa da sua resistência à compressão simples e comparar as variáveis envolvidas com amostras tratadas com cimento em iguais proporções. Para isso foram realizados ensaios de compressão simples e medidas de sucção matricial. Os resultados mostram que a resistência à compressão simples cresceu linearmente com o aumento da quantidade de cal e exponencialmente com a redução na porosidade da mistura compactada. Além disso, a variação do teor de umidade de moldagem não afetou consideravelmente a resistência à compressão simples em misturas compactadas numa mesma massa específica aparente seca. Verificou-se que, para o solo-cal no estado nãosaturado (estado em que normalmente se encontram os aterros compactados), a relação água/cal não é um bom parâmetro para estimativa da resistência à compressão simples. Ao contrário, a relação vazios/cal, assim como a relação vazios/cimento, definido pela razão entre a porosidade da mistura compactada e o teor volumétrico de aglomerante, ajustado por um expoente, demonstraram ser o parâmetro mais adequado na estimativa da resistência à compressão simples do solo-cal e do solo-cimento estudado.Not rarely, the use of traditional techniques in geotechnical engineering faces obstacles of economical and environmental nature. The soil-lime technique becomes attractive when the improvement of the local soil is a project alternative. The treatment of soils with lime finds application, for instance, in the construction of pavement base layers, in slope protection of earth dams and as a support layer for shallow foundations. However, there are no dosage methodologies and design based on rational criteria as it exists in the case of concrete technology, where the water/cement ratio plays a fundamental role in the assessment of the target strength. In that sense, this study aims to quantify the influence of lime amount, the porosity and the moisture content on the strength of a sandy soil treated with lime and pulverized basaltic rock, as well as to evaluate the use of a water/lime ratio and a voids/lime ratio to assess its unconfined compression strength and to compare the evaluated variables with samples treated by cement in the same proportions. A number of unconfined compression tests and measures of matric suction were carried out. The results show that the unconfined compression strength increased linearly with the increase of the lime amount and exponentially with the reduction on the porosity of the compacted mixture. Besides, the change on the moisture content doesn’t remarkably affected the unconfined compression strength of mixtures compacted in the same dry density. It was verified that, for the soil-lime in the unsaturated state (state usually met in compacted fills), the water/lime ratio is not a good parameter for assessment of unconfined compression strength. In the other hand, the voids/lime ratio, as well as the voids/cement ratio, defined by the reason between the porosity of the compacted mixture and the volumetric binder content, adjusted by an exponent, demonstrated to be the most appropriate parameter in the estimate of unconfined compression strength of the studied soil-lime and soil-cement.
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Murdock, Richard Craig. "RADIO FREQUENCY CONTROLLED STIMULATION OF INTRACELLULAR GOLD OR SILVER NANOPARTICLE CONJUGATES FOR USE AS POTENTIAL SENSORS OR MODULATORS OF BIOLOGICAL FUNCTION." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1277753458.
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Elsen, Andrea M. "“One-Pot” Oligomeric A2 + B3 Approach to Branched Poly(arylene ether sulfone)s: Reactivity Ratio Controlled Polycondensation." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1279291050.
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Ghilardi, Netto Thomaz. "Controle de qualidade em radiodiagnóstico : metodologia para adaptação de técnicas radiográficas entre aparelhos de raios-X." USP, Escola de Engenharia de São Carlos, 2004.
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Miranda, Victor Vasconcelos. "Precedentes judiciais: a construção da ratio decidendi e o controle de aplicabilidade dos precedentes." Pontifícia Universidade Católica de São Paulo, 2018. https://tede2.pucsp.br/handle/handle/21379.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
This work aims to analyze the formation process of the ratio decidendi, as well as its applicability in Brazilian's civil procedural law from the introduction of the binding judicial precedents system fixed in the CPC/2015. The core of this study is focused on the construction of the ratio decidendi, through the establishment of its meaning in Brazilian law, as well as the settlement of parameters which we understand as necessary to its construction. In order to do this, we introduced the structuring vectors of the formation of the ratio decidendi. It is made, from these chosen vectors, a review of the leading opinion of the judgment and the decision-making process, in order to highlight the prominence of a dialogal and convergent relation between the argument of the judges to the establishment of a universalizable decision pattern. It has also analyzed the guidance of the courts in the delimitation of the ratio decidendi and the continuous process of redefinition of the ratio decidendi's incidence field and even its content. Furthermore, it has examined the problem of 'summarysme' in Brazilian law and how it is impossible to understand the complete spectrum of operation of the ratio decidendi based only on the summary. Finally, we have highlighted the operational dynamics of judicial precedents, analyzing the application process of the precedent through a dialogical relation between the litigants and the judge, with the intensification of the judgment recital in the analytical -rather than merely syllogistic or reductionist- use of the precedents system
O trabalho tem como objetivo analisar o processo de formação da ratio decidendi e sua aplicabilidade no direito processual civil brasileiro a partir da introdução do sistema de precedentes judiciais vinculantes previstos no CPC/2015. O cerne do estudo está consubstanciado na construção da ratio decidendi, mediante o estabelecimento de seu significado no direito brasileiro, assim como com o firmamento de parâmetros que reputamos necessários à sua construção. Para tanto, apresentamos os vetores estruturantes à formação da ratio decidendi. Faz-se, a partir dos vetores eleitos, uma releitura do voto condutor do acórdão e do processo decisório, a fim de se destacar a proeminência de uma relação dialogal e convergente de argumentos dos julgadores para o estabelecimento de um padrão decisório universalizável. Trabalhou-se também sobre o dirigismo dos tribunais na delimitação da ratio decidendi e o contínuo processo de ressignificação do campo de incidência e mesmo do conteúdo da ratio decidendi. Abordou-se, também o problema do ementismo no direito brasileiro e a inviabilidade de se depreender todo o espectro de atuação da ratio decidendi a partir da ementa. Por fim, destacamos a dinâmica operacional dos precedentes judiciais, abordando o processo de aplicação do precedente mediante uma relação dialógica das partes e do julgador, com o recrudescimento da fundamentação na utilização do sistema de precedente, de forma analítica e não simplesmente silogística e reducionista. PALAVRAS-CHAVES: precedentes judiciais – ratio decidendi – vetores estruturantes
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Winter, Lukas [Verfasser], Thoralf [Akademischer Betreuer] Niendorf, Peter [Akademischer Betreuer] Wust, and Beate [Akademischer Betreuer] Röder. "Detailing radio frequency controlled hyperthermia and its application in ultrahigh field magnetic resonance / Lukas Winter. Gutachter: Thoralf Niendorf ; Peter Wust ; Beate Röder." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2014. http://d-nb.info/1054989575/34.
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Ismail, Nazli. "Controlled Source Radiomagnetotelluric (CSRMT) Applications in Environmental and Resource Exploration." Doctoral thesis, Uppsala universitet, Geofysik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-102750.
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An integrated use of radio magnetotelluric (RMT) and controlled source tensor magnetotelluric (CSTMT) measurements, the so-called CSRMT method, has been employed in environmental and resource exploration studies. A number of case histories, including a groundwater investigation in glacial deposits, a study of fracture zones for geotechnical purposes and a mining exploration study of a copper deposit, are presented in this thesis in order to illustrate the usefulness and capability of the CSRMT method. The resolutions of the estimated models using various types of data are studied. Magnetotelluric transfer functions are used to analyze the dimensionality, the near surface resistivity distortions and the near field effects in the case of CSTMT data analysis. The near field effects in CSTMT data have also been identified by performing 2½D forward modelling. Data analysis, dimensionality tests and forward modelling show that at the lowest frequencies used the CSTMT transfer functions are generally distorted by source effects, except when the source-receiver distances are sufficient large compared with the penetration depth. Regarding CSTMT transfer functions, apparent resistivities are generally less distorted than phases. TM mode transfer functions are more affected by the sources than TE mode, while tipper vectors generally contain source signatures at all frequencies. Based on the analysis of dimensionality and source effects 2D inverse modelling of CSTMT and RMT data, as well as their combination, have been performed under the plane wave assumption. The RMT method proved to be a powerful tool for imaging the upper 50 m near-surface, but their penetration depth reduces as a conductive layer structures cover the targets at depth. The penetration depth can be increased by including the CSTMT data in the modelling if the measurements are in the far field range. The resolution of the deeper parts of the models may be improved by performing a joint inversion of TE and TM modes, if the strike direction is well-defined. Alternatively, inversion of determinant data can be performed, since the determinant data are less affected by 3D structures and source effects. However the resolution of the determinant models is somewhat degraded compared to the models inverted from combined TE and TM modes.
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Foppa, Diego. "Analise de variáveis-chave no controle da resistência mecânica de solos artificialmente cimentados." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/7845.
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Freqüentemente, a utilização de técnicas tradicionais da engenharia geotécnica depara-se com obstáculos de caráter econômico e ambiental. A técnica do solo-cimento torna-se atrativa quando a melhora das propriedades do solo do local constitui-se numa alternativa de projeto. A técnica de tratamento de solos com cimento encontra aplicação, por exemplo, na construção de bases para pavimentos, na proteção de taludes em barragens de terra e como camada de suporte para fundações superficiais. Entretanto, ainda não existem metodologias de dosagem e projeto das misturas de solo-cimento baseadas em critérios racionais como existe, por exemplo, para o concreto, onde a relação água/cimento desempenha papel fundamental na obtenção da resistência desejada. Nesse sentido, este estudo tem por objetivo quantificar a influência do teor de cimento, da porosidade e do teor de umidade de moldagem, sobre a resistência mecânica de um solo arenoso artificialmente cimentado e avaliar a adequação do uso das relações água/cimento e vazios/cimento na estimativa da sua resistência à compressão simples. Para isso foram realizados ensaios de compressão simples, triaxiais não-drenados e medidas de sucção matricial. Os resultados mostram que a resistência à compressão simples cresceu linearmente com o aumento do teor de cimento e exponencialmente com a redução na porosidade da mistura compactada. Além disso, a variação do teor de umidade de moldagem afetou significativamente a resistência à compressão simples em misturas compactadas numa mesma massa específica aparente seca. Verificou-se que, para o solo-cimento no estado não-saturado (estado em que normalmente se encontram os aterros compactados), o fator água/cimento não é um bom parâmetro para estimativa da resistência à compressão simples. Ao contrário, a relação vazios/cimento, definida pela razão entre a porosidade da mistura compactada e o teor volumétrico de cimento, ajustado por um expoente, demonstrou ser o parâmetro mais adequado na estimativa da resistência à compressão simples do solo-cimento estudado.Often, the use of traditional techniques in geotechnical engineering faces obstacles of economical and environmental nature. The soil-cement technique becomes attractive when the improvement of the local soil is a project alternative. The treatment of soils with cement finds application, for instance, in the construction of pavement base layers, in slope protection of earth dams and as a support layer for shallow foundations. However, there are no dosage methodologies based on a rational criteria as it exists in the case of the concrete technology, where the water/cement ratio plays a fundamental role in the assessment of the target strength. In that sense, this study aims to quantify the influence of the amount of cement, the porosity and the moisture content on the strength of a sandy soil artificially cemented, as well as to evaluate the use of a water/cement ratio and a voids/cement ratio to assess its unconfined compression strength. A number of unconfined compression tests, undrained triaxial tests and measures of matric suction were carried out. The results show that the unconfined compression strength increased linearly with the increase of the amount of cement and exponentially with the reduction in the porosity of the compacted mixture. Besides, the change in moisture content has remarkably affected the unconfined compression strength of mixtures compacted in a same dry density. It was verified that, for the soil-cement in the unsaturated state (state usually met by compacted fills), the water/cement ratio is not a good parameter for assessment of unconfined compression strength. In the other hand, the voids/cement ratio, defined by the reason between the porosity of the compacted mixture and the volumetric cement content, adjusted by an exponent, demonstrated to be the most appropriate parameter in the assessment of unconfined compression strenght of the studied soil-cement.
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Silva, Milton Medeiros da. "Controle de posi??o de uma plataforma plana para capta??o de radia??o solar." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15478.
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Previous issue date: 2013-08-06This study aims at the design, development and performance evaluation of a flat platform to capture incident solar radiation. The design and implementation of a fuzzy system for the efficient control of the solar tracking movement of the platform are also presented
Este trabalho objetiva o projeto, o desenvolvimento e a avalia??o de desempenho de uma plataforma plana com dois graus de liberdade para capta??o da radia??o solar. S?o apresentados o projeto e a implementa??o de um sistema fuzzy para o controle eficiente do movimento de rastreamento solar da plataforma
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Oudjida, Abdelkrim Kamel. "Binary Arithmetic for Finite-Word-Length Linear Controllers : MEMS Applications." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2001/document.
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Cette thèse traite le problème d'intégration hardware optimale de contrôleurs linéaires à taille de mot finie, dédiés aux applications MEMS. Le plus grand défi est d'assurer des performances de contrôle satisfaisantes avec un minimum de ressources logiques. Afin d'y parvenir, deux optimisations distinctes mais complémentaires peuvent être entreprises: en théorie de contrôle et en arithmétique binaire. Seule cette dernière est considérée dans ce travail.Comme cette arithmétique cible des applications MEMS, elle doit faire preuve de vitesse afin de prendre en charge la dynamique rapide des MEMS, à faible consommation de puissance pour un contrôle intégré, hautement re-configurabe pour un ajustement facile des performances de contrôle, et facilement prédictible pour fournir une idée précise sur les ressources logiques nécessaires avant l'implémentation même.L'exploration d'un certain nombre d'arithmétiques binaires a montré que l'arithmétique radix-2r est celle qui répond au mieux aux exigences précitées. Elle a été pleinement exploitée afin de concevoir des circuits de multiplication efficaces, qui sont au fait, le véritable moteur des systèmes linéaires.L'arithmétique radix-2r a été appliquée à l'intégration hardware de deux structures linéaires à taille de mot finie: un contrôleur PID variant dans le temps et à un contrôleur LQG invariant dans le temps,avec un filtre de Kalman. Le contrôleur PID a montré une nette supériorité sur ses homologues existants. Quant au contrôleur LQG, une réduction très importante des ressources logiques a été obtenue par rapport à sa forme initiale non optimiséeThis thesis addresses the problem of optimal hardware-realization of finite-word-length(FWL) linear controllers dedicated to MEMS applications. The biggest challenge is to ensuresatisfactory control performances with a minimal hardware. To come up, two distinct butcomplementary optimizations can be undertaken: in control theory and in binary arithmetic. Only thelatter is involved in this work.Because MEMS applications are targeted, the binary arithmetic must be fast enough to cope withthe rapid dynamic of MEMS; power-efficient for an embedded control; highly scalable for an easyadjustment of the control performances; and easily predictable to provide a precise idea on therequired logic resources before the implementation.The exploration of a number of binary arithmetics showed that radix-2r is the best candidate that fitsthe aforementioned requirements. It has been fully exploited to designing efficient multiplier cores,which are the real engine of the linear systems.The radix-2r arithmetic was applied to the hardware integration of two FWL structures: a linear timevariant PID controller and a linear time invariant LQG controller with a Kalman filter. Both controllersshowed a clear superiority over their existing counterparts, or in comparison to their initial forms
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Walker, Matthew James. "Impact of Stringently Controlled Vacuum Environments with in situ Surface Cleaning on Contact Resistance of Au and Ru Based Radio Frequency Microelectromechanical Switches." NCSU, 2009. http://www.lib.ncsu.edu/theses/available/etd-06192009-085112/.
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Radio frequency microelectromechanical system (RF MEMS) switches have many promising advantages over solid state switches, particularly with respect to signal stability, cutoff frequency, insertion loss and power consumption characteristics. While gold has traditionally been employed for RF MEMS contacts on account of its chemical inertness and low resistivity, its softness has proven problematic in terms of reliability for commercial applications. The use of materials other than gold appears to be necessary, and a better understanding of the mechanisms causing premature failure has become increasingly necessary. Prior studies of RF MEMS contacts have been performed in air, nitrogen and vacuum environments that ranged in pressure from 10-3 to 10-7 torr. Since these studies were performed in conditions where condensation of contaminants can easily occur, their reproducibility is uncertain. The studies performed for this dissertation involved operation of switches in a stringently controlled vacuum environment, with in situ oxygen plasma surface cleaning and controlled hydrocarbon gas exposure. Three primary topics were studied, and are reported on herein: 1) The impact of in situ oxygen plasma cleaning on the resistance of Ru and Au-Ru based RF MEMS contacts in vacuum, 2) documentation of pentane and dodecane exposure levels that result in an increase in contact resistance for Ru and Au-Ru based contacts, and 3) switch lifetime measurements as a function of surrounding gas environment.