Dissertations / Theses on the topic 'RTHS'
To see the other types of publications on this topic, follow the link: RTHS.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'RTHS.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Li, Chi-yan Vivian. "Beyond the TV screen : RTHK : redevelopment of RTHK Headquarters /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25956103.
Full text
2
Yu, Suk-wa Alanar, and 余淑華. "Broadcasting park, RTHK." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31984332.
Full text
3
Yu, Suk-wa Alanar. "Broadcasting park, RTHK." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2595068x.
Full text
4
Chahine, Sandy, and Selma Chowdhury. "RTOS med 1.5K RAM?" Thesis, KTH, Hälsoinformatik och logistik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-241439.
Full textAbstract:
Internet of Things (IoT) blir allt vanligare i dagens samhälle. Allt fler vardagsenheter blir uppkopplade mot det trådlösa nätet. För det krävs kostnadseffektiv datorkraft vilket medför att det kan vara gynnsamt att undersöka mikrokontroller och hur de skulle klara av detta arbete. Dessa kan ses som mindre kompakta datorer vilka trots sin storlek erbjuder en hel del prestanda. Denna studie avser att underrätta om något befintligt operativsystem kan fungera ihop med mikrokontrollern PIC18F452 samt hur många processer som kan köras parallellt givet MCU:ns begränsade minne. Olika metodval undersöktes och diskuterades för att avgöra vilken metod som skulle generera bäst resultat. En undersökning och flera experiment genomfördes för att kunna besvara dessa frågor. Experimenten krävde att en speciell utvecklingsmiljö installerades och att den generiska FreeRTOS distributionen porterades till både rätt processor och experimentkort. Porteringen lyckades och experimenten visade att frågeställningen kunde besvaras med ett ja - det går att köra ett realtidsoperativsystem på en MCU med enbart 1,5 kB RAM-minne. Under arbetets gång konstaterade också projektet att Amazon byggt sin IoTsatsning på FreeRTOS. De hade dock satsat på en mer kraftfull MCU. Satsningen ville därmed framhålla det som en mer framtidssäker inriktning.Internet of Things (IoT) is becoming more common in today's society. More and more everyday devices are connected to the wireless network. This requires costeffective computing power, which means that it can be beneficial to investigate the microcontroller and how they would cope with this task. These can be seen as smaller compact computers which despite their size offer a lot of performance. This study aims to inform if any existing operating system can work together with the microcontroller PIC18F452 and how many processes that can run in parallel given the MCU's limited memory. A survey and an experiment were conducted to answer these questions. Different choice of methods was investigated and discussed to determine which method would generate the best results. A survey and an experiment were conducted to answer these questions. The experiments required a special development environment to be installed and the generic FreeRTOS distribution was ported to both the correct processor and the experimental card. The porting succeeded and experiments showed that the research question could be answered with a yes. You can run a real-time operating system on an MCU with only 1,5 kB RAM memory. During the work, the project also found that Amazon built its IoT on FreeRTOS. However, they had invested in a more powerful MCU. The effort would thus emphasize it as a more future-proof approach.
5
Spalluto, Angelo. "Energy Aware RTOS for EFM32." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13918.
Full textAbstract:
Power consumption is a major concern for portable or battery-operated devices.Recently, new low power consumption techniques have been used to achieveacceptable autonomy battery-powered systems. FreeRTOS is a real-time kernel designedespecially for embedded low-power MCUs. Energy Micro develops and sellsenergy friendly microcontrollers based on the industry leading ARM Cortex-M332-bit architecture. The aim of this thesis is to propose a new FreeRTOS TicklessFramework solution that exploits the power modes provided by EFM32. Three differentsolutions have been proposed, such as FreeRTOS RTC, FreeRTOS Ticklesswith prescaling and FreeRTOS Tickless without prescaling. The simulations showedthat the Tickless Framework saves energy from 15x to 44x more than Original versionof FreeRTOS. Using a self-made benchmark the battery (1500 mAh) lifetimehas been increased from 11 days to 487 days.
6
Arm, Jakub. "Detekce anomálií běhu RTOS aplikace." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-432522.
Full textAbstract:
Due to higher requirements of computational power and safety, or functional safety ofequipments intended for the use in the industrial domain, embedded systems containing areal-time operating system are still the active area of research. This thesis addresses thehardware-assisted control module that is based on the runtime model-based verificationof a target application. This subsystem is intended to increase the diagnostic coverage,particularly, the detection of the execution errors. After the specification of the architecture,the formal model is defined and implemented into hardware using FPGA technology.This thesis also discuss some other aspects and embodies new approaches in the area ofembedded flow control, e.g. the integration of the design patterns. Using the simulation,the created module was tested using the created scenarios, which follow the real programexecution record. The results suggest that the error detection time is lower than usingstandard techniques, such a watchdog.
7
Borgström, Fredrik. "Acceleration of FreeRTOS withSierra RTOS accelerator : Implementation of a FreeRTOS software layer onSierra RTOS accelerator." Thesis, KTH, Data- och elektroteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188518.
Full textAbstract:
Today, the effect of the most common ways to improve the performance of embedded systems and real-time operating systems is stagnating. Therefore it is interesting to examine new ways to push the performance boundaries of embedded systems and real-time operating systems even further. It has previously been demonstrated that the hardware-based real-time operating system, Sierra, has better performance than the software-based real-time operating system, FreeRTOS. These real-time operating systems have also been shown to be similar in many aspects, which mean that it is possible for Sierra to accelerate FreeRTOS. In this thesis an implementation of such acceleration has been carried out. Because existing real-time operating systems are constantly in development combined with that it was several years since an earlier comparison between the two real-time operating systems was per-formed, FreeRTOS and Sierra were compared in terms of functionality and architecture also in this thesis. This comparison showed that FreeRTOS and Sierra share the most fundamental functions of a real-time operating system, and thus can be accelerated by Sierra, but that FreeRTOS also has a number of exclusive functions to facilitate the use of that real-time operating system. The infor-mation obtained by this comparison was the very essence of how the acceleration would be imple-mented. After a number of performance tests it could be concluded that all of the implemented functions, with the exception of a few, had shorter execution time than the corresponding functions in the original version of FreeRTOS.Idag är effekten av de vanligaste åtgärderna för att förbättra prestandan av inbyggda system och realtidsoperativsystem väldigt liten. På grund av detta är det intressant att undersöka nya åtgärder för att tänja prestandagränserna av inbyggda system och realtidsoperativsystem ytterliggare. Det har tidigare påvisats att det hårdvarubaseraderealtidsoperativsystemet, Sierra, har bättre prestanda än det mjukvarubaseraderealtidsoperativsystemet, FreeRTOS. Dessa realtidsoperativsystem har även visats vara lika i flera aspekter, vilket betyder att det är möjligt för Sierra att accelererera FreeRTOS. I detta examensarbete har en implementering av en sådan acceleration genomförts. Eftersom befintliga realtidsoperativsystem ständigtär i utveckling i kombination med att det är flera år sedan som en tidigare jämförelse mellan de båda systemen utfördes, så jämfördes FreeRTOS och Sierra i fråga om funktionalitet och uppbyggnad även i detta examensarbete.Denna jämförelse visade att FreeRTOS och Sierra delar de mest grundläggande funktionerna av ett realtidsoperativsystem, och som därmed kan accelereras av Sierra, men att FreeRTOS även har ett antal exklusiva funktioner för att underlätta användningen av det realtidsoperativsystemet. Informationen som erhölls av denna jämförelse var sedan grunden för hur själva accelerationen skulle implementeras. Efter ett antal prestandatesterkunde det konstateras att alla implementerade funktioner, med undantag för ett fåtal, hade kortare exekveringstid än motsvarande funktioner i ursprungsversionen av FreeRTOS.
8
Soltani, Mahnaz. "Utveckling av realtidsoperativsystem(RTOS) till Atmega16." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-23620.
Full text
9
Prasad, Raghav. "Task Schedule Generator for an RTOS." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1446547203.
Full text
10
Rydberg, Lova. "RTDS modelling of battery energy storage system." Thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155960.
Full textAbstract:
This thesis describes the development of a simplified model of a battery energy storage. The battery energy storage is part of the ABB energy storage system DynaPeaQ®. The model has been built to be run in RTDS, a real time digital simulator. Batteries can be represented by equivalent electric circuits, built up of e.g voltage sources and resistances. The magnitude of the components in an equivalent circuit varies with a number of parameters, e.g. state of charge of the battery and current flow through the battery. In order to get a model of how the resistive behaviour of the batteries is influenced by various parameters, a number of simulations have been run on a Matlab/Simulink model provided by the battery manufacturer. This model is implemented as a black box with certain inputs and outputs, and simulates the battery behaviour. From the simulation results a set of equations have been derived, which approximately give the battery resistance under different operational conditions. The equations have been integrated in the RTDS model, together with a number of controls to calculate e.g. state of charge of the batteries and battery temperature. Results from the RTDS model have been compared with results from the Simulink model. The results coincide reasonably well for the conditions tested. However, further testing is needed to ensure that the RTDS model produces results similar enough to the ones from the Simulink model, over the entire operational range.
11
TAKADA, Hiroaki, Hiroyuki TOMIYAMA, Takayuki WAKABAYASHI, and Shinya HONDA. "RTOS-Centric Cosimulator for Embedded System Design." Institute of Electronics, Information and Communication Engineers, 2004. http://hdl.handle.net/2237/15030.
Full text
12
Rangdale, Rachel Elizabeth. "Studies on rainbow trout fry syndrome (RTFS)." Thesis, University of Stirling, 1995. http://hdl.handle.net/1893/2163.
Full textAbstract:
A comprehensive survey of representative rainbow trout (Oncorhynchus mykiss) hatcheries revealed that the Gram negative, yellow-pigmented, filamentous bacterium Cytophaga psychrophila was implicated in a single disease in the U.K. and other European states. The involvement of C. psychrophila as the aetiological agent of the syndrome was substantiated by the fulfilment of Koch's postulates. Infectivity studies with isolates of C. psychrophila, carried out under natural and laboratory conditions successfully reproduced clinical signs and gross pathological changes analogous to those observed during field outbreaks of the condition. Histopathological examination of artificially and naturally infected fish tissues demonstrated several features that were considered to be pathognomonic for RTFS. Preliminary electron microscopic studies described the ultra-structure of C. psychrophila and partially elucidated the cellular response to the pathogen. Environmental sampling across selected hatchery sites demonstrated that members of the family Cytophagaceae formed a substantial element of the bacterial flora from natural waters, although recovery of C. psychrophila was restricted to areas where the substantial mortalities in fry attributable to RTFS had occurred. C. psychrophila was isolated from the sexual fluids of broodstock and additionally the bacterium was demonstrated associated with surfaces of eyed ova following various disinfection regimes. The minimum inhibitory concentrations of a range of antimicrobial agents both existing in, and novel to, aquaculture were examined, revealing compounds which would potentially mitigate losses attributable to RTFS during field outbreaks. The emergence of bacterial resistance to chemotherapeutants was discussed. The minimum inhibitory and bactericidal concentrations and required exposure times to a number of disinfecting agents were demonstrated. The efficacy of these agents as disinfectants of egg surfaces and equipment associated with fish production was assessed. The potential of a number of serodiagnostic techniques were evaluated as a means of rapid detection of C. psychrophila in diseased fish.
13
Midéus, Gustav, and Chavez Antonio Morales. "RISC-V Thread Isolation : Using Zephyr RTOS." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279100.
Full textAbstract:
Many embedded systems lack a memory management unit (MMU) and thus often also lack protection of memory. This causes these systems to be less robust since the operating system (OS), processes, and threads are no longer isolated from each other. This is also a potential security issue and with the number of embedded systems rapidly increasing as a result of the rise of Internet of things (IoT), vulnerabilities like this could become a major problem. However, with a recent update to the RISC-V processor architecture, a possibility to isolate regions of memory without an MMU was introduced. This study aims to identify problems and possibilities of implementing such memory protection with RISC-V. Based on a study of literature and documentation on memory protection and the RISC-V architecture, a prototype was designed and implemented to determine potential problems and evaluate performance in terms of execution time and memory cost. The developed prototype showed aworking implementation of memory protection for the memory regions with RISC-V. The evaluation of the prototype demonstrated an increase in context switch execution time and memory usage. The results indicate that the implemented memory protection comes with an increased cost in performance with a constant factor and a small memory overhead. Therefore, it is recommended that implementations that wish to implement memory protection with RISC-V on smaller embedded systems where time and memory may be crucial takes the overhead in consideration. Further research and testing is needed to identify optimizations that could improve the performance as well as discover security flaws.Många inbyggda system saknar en enhet för minneshantering (s.k. MMU) och saknar därför oftast minnesskydd. Detta leder till att dessa system blir mindre robusta eftersom operativsystemet, processer och trådar inte längre är isolerade från varandra. Detta är också en säkerhetsbrist och med antalet inbyggda system som snabbt ökar på grund av tillväxten av Internet of things (IoT), så kan sårbarheter som denna bli ett stort problem. Med en nyligen introducerad uppdatering av RISC-Vprocessor arkitekturen, så introducerades en möjlighet till att isolera minne utan hjälp av en MMU. Denna studie syftar till att identifiera problem och möjligheter av att implementera sådant minneskydd med RISC-V. Baserat på en studie av litteratur och dokumentation om minnesskydd och RISC-V arkitekturen designades och implementerades en prototyp för att hjälpa till att fastställa problem och möjligheter samt göra en utvärdering med avseende på prestanda- och minneskostnader. Den utvecklade prototypen visade en fungerande implementering av minneskydd för minnesregioner med RISC-V. Utvärderingen av prototypen visade en ökad exekveringstid för kontextbyten och ökad minnesanvändning. Resultaten indikerar att det implementerade minneskyddet kommer med en ökad kostnad i prestanda med en konstant faktor och en liten omkostnad i minne. Därför rekommenderas att implementeringar som vill implementera minneskydd med RISC-V på mindre inbyggda system där tid och minne kan vara avgörande tar hänsyn till omkostnaderna. Ytterligare studier och tester behövs för att identifiera optimeringar som kan förbättra prestandan och upptäcka säkerhetsbrister.
14
Václavek, Miroslav. "Řízení 6-ti osého robota v RTOS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217874.
Full textAbstract:
The thesis deals with the analysis, software design and the study of 3D kinematic model of robotic manipulator ROB 2-6. It creates the control software for this manipulator, containing user interface based on MFC applications. Moreover, the thesis is concentrated on the solution of various problems, e.g. non-linearity of servomotor or the limitation of manipulator´s attainability. Finally, it poses a documentation of the single project and offers new possibilities of further development in the control of this manipulator.
15
Li, Chi-yan Vivian, and 李至欣. "Beyond the TV screen: RTHK : redevelopment ofRTHK Headquarters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31984034.
Full text
16
SANTOS, César Augusto Marcelino dos. "Sistema Dinâmico de Economia de Energia em RTOS." reponame:Repositório Institucional da UNIFEI, 2017. http://repositorio.unifei.edu.br:8080/xmlui/handle/123456789/699.
Full textAbstract:
Submitted by repositorio repositorio (repositorio@unifei.edu.br) on 2017-03-27T12:27:37Z
No. of bitstreams: 1
dissertacao_santos_2017.pdf: 2444108 bytes, checksum: d0e6be73571ddfb0385f8093b9745db0 (MD5)Made available in DSpace on 2017-03-27T12:27:37Z (GMT). No. of bitstreams: 1 dissertacao_santos_2017.pdf: 2444108 bytes, checksum: d0e6be73571ddfb0385f8093b9745db0 (MD5) Previous issue date: 2017-02
Este documento apresenta a utilização de diferentes modos de economia de energia aplicados em sistemas operacionais de tempo real, quando o mesmo não possui tarefas a serem executadas. Espera-se que, ao entrar em modos de baixo consumo oferecidos pelo próprio microcontrolador, haja uma diminuição no consumo de energia, proporcional ao número de módulos internos que são desativados. Entretanto, a economia pode não se mostrar válida de acordo com a carga de processamento que o sistema possui, pois a corrente instantânea consumida após a transição do estado de baixo consumo para o modo ativo é superior ao consumo do sistema em operação constante. Desta forma, será apresentada uma política de economia de energia e como aplicá-la, simultaneamente minimizando a carga energética e balanceando a exigência de processamento.
17
Hammerin, Karl, and Ramona Streitenberger. "RTLS – the missing link to optimizing Logistics Management?" Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell organisation och produktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45264.
Full textAbstract:
The purpose of this thesis was to investigate how potentials of Real-Time Location Systems (RTLS) in relation to Just In Time (JIT) management could be utilized within logistics management. For this, a framework, based on previous research of the interrelations of RTLS and JIT management, is proposed, to assess the effects of RTLS on logistics management, both on a managerial - as well as on an operational level. To answer the proposed research questions, the study followed a deductive and exploratory case study design, which was conducted at a company within the automotive industry. To understand the challenges within logistics management at the case company, interviews, observations, analysis of internal documents and a focus group were used, which allowed for a triangulation of the captured information. The findings and analysis of the data show that on an operational level the challenges within logistics management are related to complex logistic structures, pull strategies with partial push material flows, lack of information and – reliable data, as well as processes reliant on individuals. On the managerial level the findings suggest challenges related to high complexity and space constraints, time constraints, lack of transparency and – data connections, the company's improvement focus, employee attitude and a lack of reliable data. When the challenges were evaluated in relation to the proposed framework, it shows that these challenges would be resolved or counteracted by the benefits RTLS could provide in relation to JIT management. This study thereby supports the positive correlation between RTLS’s potential and JIT in logistics management.
18
Neupane, Sujaya. "Effects of low and high frequency repetitive Transcranial Magnetic Stimulations (rTMS) and state-dependent effects of rTMS on cat area 18." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114586.
Full textAbstract:
Repetitive Transcranial magnetic stimulation (rTMS) has been used to treat neurological diseases as well as to understand brain-behavior relationship. However, the underlying effects of rTMS at the neuronal level have not been studied extensively enough to corroborate the findings from behavioral TMS experiments in humans. We have recorded spikes and local field potential from visual cortical area 18 of anesthetized and paralyzed cats using 10x10 multi-electrode array before and after the application of rTMS. Using 4Hz and 20Hz rTMS, we have found evidence that at the neuronal level, both the low and high frequency TMS causes suppression of evoked activity with statistical significance. We also used orientation tuning curves of multiple cortical sites as a behavioral analogue to test the state-dependent effects of rTMS. Both the conditioned and the non-conditioned TMS caused suppression of tuning behavior of the neurons. Activated cortical state was achieved by conditioning rTMS pulses with visual stimulus. We have observed that the change caused by rTMS in the tuning behavior of the neurons was in the same direction whether or not the cortex was at an activated state when TMS was applied. Although, there was a trend of difference between the levels of suppression and between the changes in tuning properties, this difference was not statistically significant in all the paradigms tested in this study.La stimulation magnétique transcrânienne répétée (SMTr) a été utilisée pour traiter les maladies neurologiques ainsi que pour comprendre la relation entre le cerveau et le comportement. Toutefois, les effets sous-jacents de la SMTr au niveau neuronal n'ont pas été suffisamment étudiés pour corroborer les résultats d'expériences comportementales SMT chez les humains. Nous avons enregistré les spikes et les potentiels de champs locaux de l'aire corticale visuelle 18 de chats anesthésiés et paralysés, à l'aide d'une multi-électrode 10x10 avant et après l'application de la SMTr. En utilisant les SMTr de 4Hz et de 20Hz, nous avons prouvé qu'au niveau neuronal à la fois les SMT basse et haute fréquences provoquent la suppression significative de l'activité évoquée. Nous avons également utilisé les courbes de sélectivité à l'orientation de multiples aires corticales comme un reflet du comportement afin de tester si les effets de la SMTr étaient dépendants de l'état d'activation du cerveau. Les SMT-conditionnée et non-conditionnée ont toutes les deux causé la suppression des courbes de sélectivité des neurones. Un état cortical activé a été obtenu par des impulsions de SMTr conditionnée avec un stimulus visuel. Nous avons observé que le changement provoqué par la SMTr sur la sélectivité des neurones allait dans la même direction que le cortex soit ou non dans un état activé lorsque la SMT est appliquée. Bien qu'il y ait une tendance à une différence entre les niveaux de suppression et entre les changements dans les propriétés de sélectivité, cette différence n'était statistiquement significative dans aucun des paradigmes testés dans cette étude.
19
Nilsson, Andreas M. "Realtidsoperativsystem på mätinstrument." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1187.
Full textAbstract:
Emwiro Vibe is a complete system for seismic measurements. The functionality of the system was before the completion of this project handled using a software contruction based on a state machine. Emwitech, the company developing Emwiro Vibe, expressed a desire to replace this solution with a real-time operating system (RTOS). The project consisted of two parts. Firstly the existing software was studied, available RTOSes was evaluated, and the RTOS most suitable for the application was selected. Secondly the systems software was rewritten to make use of the selected RTOS. The conclusion made from the evaluation, taking into consideration existing requirements, was that FreeRTOS was the most appropriate RTOS for this application. The systems software was successfully modified to make use of the benefits provided using a RTOS. Despite the introduction of a RTOS in the system, the power consumption did not increase considerably, it was even reduced i certain cases.
20
McNamara, William G., Page Stanley, and Jay Nichols. "RTPS Telemetry - Simulator Link at Naval Air Warfare Center." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/611514.
Full textAbstract:
International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, NevadaOver the last 3 years the Naval Air Warfare Center Aircraft Division (NAWCAD), Patuxent River, MD, has been in the process of developing a link between its secure Manned Flight Simulator (MFS) and Real Time Processing System (RTPS) facilities. The MFS hosts a wide variety of high fidelity fixed and rotary wing aircraft simulation models. The RTPS is used as a telemetry ground station for conduct of Navy flight testing at Patuxent River MD. The ability to integrate simulation with flight testing in a real time environment provides new potential for increased flight safety, enhanced engineering training, optimized flight test planning, real time simulation fidelity assessments, improved engineering analysis and other applications for enhanced flight testing, data analysis and data processing. A prototype system has been successfully designed and operated at NAWCAD in support of an F/A-18C flight test project which required simultaneous merging and display of real time and simulation data to reduce the risk of departure from controlled flight. As currently designed the link (encryption and decryption gear in the loop) can be operated in three modes: (1) Simulation sending data to RTPS (e.g. pilot-engineer pre-first flight preparation/training scenario, (2) simulation is driven by real aircraft control surface inputs and response is compared with that of the real aircraft for simulation fidelity assessments and (3) simulation "rides along" with the real aircraft and data are extracted from the simulation which are otherwise unavailable from the aircraft (e.g. flight control law interconnect signals, control law feedback signals, aerodynamic data, propulsion model data, avionics model data, other model data etc.). This paper discusses, design and implementation aspects of the RTPS-Simulator link, and includes a description of how the link was used to support a real time flight test program by providing critical safety of flight data. Other potential uses for the link will also be highlighted.
21
Gotz, Marcelo. "Run-time reconfigurable RTOS for reconfigurable Systems-on-Chip." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/117816.
Full textAbstract:
Eingebettete Systeme haben eine starke Präsenz in unseren alltäglichen Leben bekommen, in vielen Bereichen sind sie allgegenwartig geworden. Dieses ist eine Herausforderung für die Forschung im Bereich solcher Systeme. Ständig müssen neue adäquate Lösungen gefunden werden. Durch die zunehmenden Anforderungen nimmt die Leistung und Flexibilität bei eingebetteten Systemen ständig zu. Zum Beispiel, eine einzelne Architektur muss in der Lage sein, in bestimmten Fällen, mehrere Applikationen mit verschiedenen Anforderungen zu unterstützen, die asynchron und dynamisch ablaufen können (dynamische Umgebungen). Rekon gurierbare Rechensysteme scheinen ein potentielles Paradigma für diese Szenarien zu sein, weil sie Flexibilität und hohe Rechenleistung für moderne eingebettete Systeme liefern können. Von besonderem Interesse sind jene Architekturen, wo ein Mikroprozessor mit rekon gurierbarer Hardware fest verbunden ist (hybride Plattform). Eine solche hybride Plattform nennt man rekon- gurierbares System-on-Chip (RSoC). Jedoch nimmt die Komplexität in solchen Systemen ständig zu. Deshalb ist die Anwendung eines Betriebssystems (OSs) wesentlich, um eine notwendige Abstraktion von den vorhandenen Ressourcen in rekon gurierbaren Rechensystemen zu ermöglichen. Weiterhin, ist durch die gemeinsame Nutzung von Ressourcen einer solchen Architektur und deren Verwaltung in Bezug auf die Rekon- guration, der Einsatz eines OS zwingend notwendig. Dennoch sind die Ressourcen in eingebetteten Systemen begrenzt. Deshalb muss beim Entwurf eines OS für ein solches System sorgfältig vorgegangen werden, da das OS an sich schon Ressourcen verbraucht. Zusammen mit den Applikationen kann das OS auch von den RSoC Architekturen profitieren dadurch, dass das OS sich selbst auf der hybriden Plattform rekon gurieren kann. Somit kann das OS dieübrigen Ressourcen nutzen, die nicht gegenwärtig von der Applikation benutzt werden. In diesen Rahmen präsentiert die vorliegende Arbeit den Entwurf von geeigneten Methodologien, Strategien, Hardware und Entwurfsunterstützungen für eine geeignete Verwaltung von dynamischen Rekon gurierungsaktivit äten eines Echtzeitbetriebssystems (RTOSs), das auf einer RSoC basierten Plattform läuft. Die Intention dabei ist es die Selbst-Rekon guration der RTOS Dienste auf einer hybriden Plattform zu ermöglichen, wodurch die vorhandenen Ressourcen der Plattform e ektiv ausgenutzt werden können.Sistemas embarcados estão cada vez mais presentes em nossas vidas e estão se tornando onipresentes. Este fato tem demandado grandes esforços em pesquisa para criação de propostas e soluções para os desafios gerados no desenvolvimento destes sistemas. Por exemplo, uma arquitetura moderna de sistemas embarcados requer alto poder de computação e também grande exibilidade, e a demanda por estes requisitos tem crescido constantemente. Uma única arquitetura deve executar, em certos casos, diferentes aplicações com diferentes requisitos e com inicio de execução indeterminado, caracterizando desta maneira um ambiente dinâmico. A computação reconfigurável aparece como um paradigma promissor para estes casos pois consegue prover alto poder de computação juntamente com exibilidade requeridas pelos sistemas embarcados modernos. Especialmente interessantes são arquiteturas baseadas em System-on-Chip reconfiguráveis (RSoC), nas quais um microprocessador está fortemente conectado a um hardware reconfigurável (plataforma híbrida). Porém a complexidade no desenvolvimento destes tipos de sistemas cresce, tornando o uso de um sistema operacional (SO) indispensável. Entretanto, uma plataforma de execução de um sistema embarcado sofre pela escassez de recursos. Este fato exige um cuidado especial no desenvolvimento de um SO uma vez que este também usa os recursos desta plataforma. Juntamente com as tarefas da aplicação, o SO também pode tirar proveito de uma plataforma baseada em RSoC onde este é capaz de se auto reconfigurar sobre esta plataforma híbrida. Deste modo, o SO pode usar os recursos computacionais, correntemente não requeridos pelas aplicações, para a sua execução. Dentro deste contexto, este trabalho apresenta o design de metodologias, estratégias e suporte em hardware e software para o gerenciamento apropriado das atividades de reconfigurações dinâmicas de um sistema operacional de tempo-real (RTOS), que é executado em uma plataforma baseada em RSoC. A intenção com isto é a de proporcionar ao RTOS meios com os quais este é capaz de se auto reconfigurar nesta arquitetura híbrida com a intenção de atingir um uso mais eficiente dos recursos computacionais desta plataforma de execução.
Embedded systems are massively present in our lives and they are becoming omnipresent. This has demanded strong e orts in research for providing new solutions for the challenges faced in the design of such systems. For instance, the requirements of high computational performance and exibility of the contemporary embedded systems are continuously increasing. A single architecture must be able to support, in certain cases, di erent kind of applications with di erent requirements which can start asynchronously and dynamically (changing environments). Recon gurable computing seems to be a potential paradigm for these scenarios as it can provide exibility and high computational performance for modern embedded systems. Of especial interest are those architectures where a microprocessor is tightly connected with a recon gurable hardware (hybrid platform), constituting a so called recon gurable System-on-Chip (RSoC). However, the complexity in designing such systems rises. Therefore, the usage of an Operating System (OS) is essential to provide the necessary abstraction of the computational resources in recon gurable computing. Moreover, due to the intrinsic overhead caused by the recon guration activities and the potential sharing of computational resources the necessity for support provided by an OS is unquestionable. Nevertheless, embedded system platforms lack in computational resources. This fact requires a careful design of an OS for such a system, since it also consumes its resources. Along with the application tasks, the OS can pro t from a RSoC based architecture by recon guring itself over this hybrid platform. Thereby, the OS can make use of the remaining resources that are not currently required by the application for its execution. Within this context, this work presents the design of proper methodologies, strategies, hardware and design support for a proper management of dynamic recon guration activities of a Real-Time Operating System (RTOS) running on a RSoC based platform. The intention thereby, is to promote the self-recon guration of the RTOS services on this hybrid platform, so that the computational resources of this execution platform are used in an e cient way.
22
Možný, Karel. "Implementace ovladače I2S Audio v systému Freescale MQX RTOS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219674.
Full textAbstract:
This thesis deals with design and development of a I2S module driver for real-time operating system MQX running on a ColdFire V4 architecture based processor. Further there are presented circuit diagrams and PCBs created for testing of functions and properties of the driver. Signal input is a digital audio in form of S/PDIF interface, output is an analogue signal, that can be listened by the means of a headphone amplifier. The conclusion describes a sample application demonstrating function of the driver on developed hardware.
23
Hung, Hiu-yin Gladys. "Reform of Radio Television Hong Kong issues, concerns and prospects /." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36439113.
Full text
24
Zabel, Henning. "Techniken zur Simulation von eingebetteten Systemen mit abstrakten RTOS-Modellen." Aachen Shaker, 2010. http://d-nb.info/1002414164/04.
Full text
25
Knyzelis, Milvydas. "“Russophobia kernel”: an analysis of RT’s strategic narratives of Lithuania." Thesis, Malmö universitet, Institutionen för konst, kultur och kommunikation (K3), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-46154.
Full textAbstract:
This research aims to explore the dissemination of strategic narratives around Lithuania through the set of news articles of the Russian state-funded media agency RT. As an international media platform, RT has been previously identified by scholars as an important structural element of Russian information warfare strategy. To identify the strategic narratives, this research follows the procedures of thematic analysis informed by the strategic narrative framework. The findings of this study indicate that RT, through the strategic narratives of Lithuania, seeks to criticize Western leadership and indirectly promote a positive image of Russia as an alternative to the West. While at the national level, the goals of RT’s strategic narratives on Lithuania include creating an image that Lithuanian governmental institutions are broken; showing the Lithuanian government as incompetent, and associating it with a fascist regime; presenting Lithuania not only as Russophobic but as a failing state as well. Further research could contribute to elaborating the strategical framework of the Russian information warfare effort in the post-Soviet countries.
26
Lipka, Radim. "Bezdrátový lokalizační modul s nízko-příkonovým firmware na bázi RTOS." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2020. http://www.nusl.cz/ntk/nusl-417256.
Full textAbstract:
This thesis focuses on the design and implementation of the wireless localization module, using UWB technology with emphases on low-power firmwre based on RTOS. Wireless localization is based on TDoA algorithm. The resulting HW module is designed as a four layer PCB, based on MCU crf52832 (ARM Cortex M4) and UWB module DevaWave DW1000. Firmware is implemented using FreeRTOS with emphasis on low power consumption. For hardware implementation, Eagle CAD was used. Firmware is implemented in C and Assembly programming languages.
27
Gothard, Adolf. "Implementace RTOS do mikrokontrolérů STM32 s jádrem ARM Cortex-M4F." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220905.
Full textAbstract:
This masters's thesis deals with choice and implementation of two free real-time operating systems into powerful 32-bit microcontroller with ARM Cortex-M4F core. First, there is shortly described the ARM architecture in general, its programmer's model, instruction set and Cortex-M4F core in brief. Next is description of the architecture of used microcontroller STM32F407VGT6 from ST Microelectronics, description of its integrated memories and their organization and functions of its integrated A/D and D/A converters. Next part of this thesis deals with searching real-time operating systems with ARM Cortex-M4F core support and then choose two of these systems for the implementation. The chosen operating systems are more closely described in two following chapters. Next chapter analyses possible implementations of the digital PSD controller and more complex system of such controllers using real-time operating system. Following chapter describes implementation of chosen operating systems and designed controllers. Last chapter deals with evaluation of features and qualities of the chosen real-time operating systems for implementation of embedded control system.
28
Wagner, Andrew. "Municipal bond market efficiency post the implementation of RTRS transparency regulations /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18675.pdf.
Full text
29
Watson, Daniel. "Implementation och utvärdering av Mimer SQL Real-Time på INtime RTOS." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-24988.
Full textAbstract:
Virtualisering är en ökande trend där man istället för att ha en separat hårdvaruplattform förvarje system, så exekverar flera virtuella system på en och samma maskin. Dessa system kanha olika egenskaper och krav, exempelvis kan ett delsystem med hårda realtidskravinteragera med ett annat delsystem utan realtidskrav. Ett exempel på detta är ett industrielltstyrsystem där ena delsystemet samlar in tidskritisk systemdata i realtid medan det andradelsystemet utför icke tidskritiska åtgärder som är baserad på denna information, som tillexempel att grafiskt åskådliggöra systemstatus.Att dela upp system mellan olika virtuella delsystem ställer höga krav på delning av data. Ettsätt att dela data på ett säkert och strukturerat sätt är att använda sig av en realtidsdatabas.I detta exjobb har vi undersökt möjligheten att anpassa den kommersiella realtidsdatabasenMimer SQL Real-Time Edition för att användas i det virtualiserbara realtidssystemet INtime.Arbetet omfattar undersökningar av olika modeller för delat minne samt synkroniseringmellan systemen. Resultaten av dessa undersökningar har inkorporerats i en version avMimer SQL Real-Time Edition anpassad för virtualisering i INtime. Denna implementationhar följts upp av funktions- och prestandatester som visar att implementationen fungerarbåde funktionellt och prestandamässigt väl samt med bibehållen predikterbarhet jämförtmed tidigare versioner av Mimer SQL Real-Time Edition.
30
Tomiyama, Hiroyuki, Shin-ichiro Chikada, Shinya Honda, and Hirouyuki Takada. "An RTOS-based approach to design and validation of embedded systems." IEEE, 2005. http://hdl.handle.net/2237/6840.
Full text
31
Magrin, Fabiano Gustavo Silveira 1978. "Modelagem de um relé de proteção diferencial de transformador no RTDS." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259599.
Full textAbstract:
Orientador: Maria Cristina Dias TavaresDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-25T04:21:56Z (GMT). No. of bitstreams: 1 Magrin_FabianoGustavoSilveira_M.pdf: 5471875 bytes, checksum: 204630879d78c9f5167f324d6d0f5fe9 (MD5) Previous issue date: 2014
Resumo: Devido à dificuldade de execução de testes em sistemas reais os engenheiros procuram ferramentas e modelos para simular ou emular os sistemas reais em laboratório. Nesse sentido, o objetivo deste projeto de pesquisa foi desenvolver um modelo do relé de proteção diferencial de transformador no simulador digital em tempo real RTDS, baseando-se no relé SEL-787 da Schweitzer Engineering Laboratories Inc. O objetivo de criar um relé específico e já existente no mercado, saindo dos modelos genéricos, é devido à necessidade dos estudos em laboratório apresentarem resultados concretos e que representem o sistema real, desta forma apresentará grande valia para as futuras expansões do Sistema Elétrico Nacional ou Internacional. Após o desenvolvimento do modelo matemático do relé, foram criadas rotinas de teste exclusivas para análise do modelo e este foi testado em conjunto com um relé SEL-787 de forma a permitir uma comparação dos resultados. Para a realização deste trabalho foram estudadas e analisadas as situações em que um relé de proteção diferencial de transformador enfrenta no campo, como energização de transformador, saturação, faltas externas, faltas externas com saturação de TC, faltas internas a seção diferencial e externa ao transformador e faltas internas ao transformador como falta espira-terra e entre espiras. Os mesmos testes foram aplicados ao modelo de relé diferencial já existente na biblioteca do RTDS com o intuito de verificar se realmente modelos genéricos apresentam resultados diferentes de modelos específicos. A contribuição da pesquisa foi o desenvolvimento pioneiro do modelo do relé de proteção diferencial no ambiente RTDS
Abstract: Due to the difficulties involving tests in real systems engineers continuously look for tools and models to simulate or emulate real systems inside laboratories. With this focus, this job had the objective of developing a transformer differential protection relay in Real Time Digital Simulator, RTDS, based on SEL-787 relay, manufactured by Schweitzer Engineering Laboratories Inc. The objective of creating a specific relay already in the market, and not a generic model relay, is due to the necessity of the laboratories studies give real results and also represent the real system. This actual representation gives the engineers a more concrete data to support future expansions of the national and international electric systems. After the development of the relay model itself, it was tested in conjunction with a real SEL-787 allowing comparison of the results. For the accomplishment of this job many different situations which interfere in the daily operation of the relay in the field such as inrush, saturation, external faults, external faults with current transformer saturation, internal fault to the differential section but external to the transformer and internal faults like turn-to-turn faults and ground faults were studied and analyzed. The same tests were applied to a differential relay model already in the RTDS library with the purpose to verify whether generic models have different results compared to specific models. This research formerly presents a transformer differential relay model of a commercial relay for RTDS library
Mestrado
Energia Eletrica
Mestre em Engenharia Elétrica
32
Sabnis, Prerana Ajit. "Involvement of the Intraparietal Sulcus in Sentence Comprehension - An rTMS investigation." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/255372.
Full textAbstract:
Semantically reversible sentences, i.e., sentences wherein both characters can potentially perform the given action, have long been used to understand the various mechanisms involved in successful sentence comprehension. Over the decades, studies have established that sentences with non-canonical word-orders such as passive voice sentences are more difficult to process than canonical counterparts such as active voice sentences using psycholinguistic, neuroimaging, lesion-based, and more recently transcranial brain stimulation methods such as transcranial magnetic stimulation (TMS). In addition to understanding the cognitive processes involved, these studies have also attempted to uncover the underlying neural correlates. Various parts of the frontal, temporal, and parietal lobes have been thought to be critical for different functions. In the recent years, the parietal regions have garnered considerable attention. In particular, various studies have found the intraparietal sulcus (IPS) to be involved in the comprehension of semantically reversible sentences, particularly when they have non-canonical word-orders. In this thesis, I attempted to build on this literature and further understand the role of the IPS in sentence comprehension.
More specifically I followed-up on two TMS studies by Finocchiaro and colleagues that looked at reversible Italian active and passive sentences. Online repetitive TMS (rTMS) to the posterior portion of the left IPS (henceforth, l-pIPS) affected only the processing of passive sentences
in both experiments. In fact, one of the studies also found an effect on ‘passive’ pseudosentences, thus, prompting the authors to suggest that the l-pIPS affects passive sentences irrespective of semantic meaningfulness. The authors concluded that this region is likely to be involved in sentence comprehension, particularly at the stage where thematic reanalysis, i.e., a revision of the initially ascribed thematic roles, occurs. However, these studies were unable to discern if these effects were seen on reversible passives due to their reversibility, passive voice, or the non-canonical word-order seen in passive sentences. They also raised questions regarding whether the region is important in processing only thematic reversibility or is also involved in comprehending reversible sentences without thematic roles (e.g., comparative sentences). I ran three experiments to better understand these factors.
In Chapter 1 I summarise the literature on the comprehension of reversible sentences. I discuss findings from behavioural, lesion-based, neuroimaging, and TMS studies that have formed the basis of the current thesis. I conclude by bringing to attention some of the questions raised by these studies that I have attempted to answer in the subsequent chapters. In Chapter 2 I attempted to understand the role of passive voice and reversibility in reanalysis and sentence comprehension. To do this I used a sentence comprehension task while administering online rTMS to the l-pIPS. Participants performed a forced-choice task where they were required to read reversible and irreversible Italian active and passive voice sentences and identify either the agent or the theme in alternate blocks. The experiment showed an effect of rTMS only on reversible passive sentences. While these results are in line with the previous studies, they also draw attention to a critical aspect of comprehension of passive voice sentences. They suggest that passive voice in itself may be insufficient to trigger reanalysis. Instead, it is likely that reanalysis is triggered by the co-occurrence of numerous factors such as voice and reversibility. However, as with the previous studies, this study
still does not clarify the role of non-canonical word-order or passive voice per se.
In an attempt to distinguish between the two, I ran an rTMS experiment with a sentence-picture verification task in Chapter 3. The experiment used reversible active and passive voice sentences in Hindi. The advantage that Hindi offers in this regard is that both actives and passives are typically presented in the agent-theme-action order. Consequently, such passives may not require the reassigning of originally established thematic roles. Stimulation to the l-pIPS showed no effects on these actives or passives. Interestingly, these null results serve as supporting evidence (albeit, weak) that non-canonical word-order may be essential for thematic reanalysis. If passive voice alone, or even a combination of passive voice and reversibility were sufficient to engender reanalysis, stimulation should have had effects on the passives even in the absence of a non-canonical word-order (as seen in the stimuli of this experiment).
Finally, I attempted to understand if the region was involved only in comprehending reversible sentences with thematic role assignment, or also played a role in reversible sentences without thematic role assignment such as comparative sentences (where one of the two characters is the owner of a given property/feature). To do this, I ran the final rTMS experiment reported in Chapter 4. Participants received online stimulation to the l-pIPS while performing a sentence-picture verification task. The stimuli sentences consisted of reversible Italian declarative active and passive sentences, and comparative of majority or minority sentences. Comparatives were used because unlike Italian actives and passives, both types of comparatives are identical in word-order and other morphosyntactic features. In an attempt to maintain the visual complexity across stimuli pictures, same pictures were used to depict the relationships in both declarative and comparative sentences. The results of this study are rather puzzling. Unlike previous studies no effects were found on passive sentences. In terms of the comparative sentences, a selective effect was seen on the ‘easier’ comparatives of majority. These results call into question previous findings which have found an effect on the more ‘difficult’ sentence type, i.e., the passives. The effect of TMS on the comparatives of majority indicates the involvement of the l-pIPS in sentence comprehension yet again. However, these results to do not clarify what specific features of a sentence the l-pIPS helps comprehend. Moreover, given the consistent effect of rTMS on reversible Italian passives in the previous experiments, and the effect on comparatives of majority, it is possible that the current results may have been confounded by the use of complex stimuli.
Coupled with the findings from the Finocchiaro studies, this thesis establishes the role of the l-pIPS in sentence comprehension. In particular, the results of the two Finocchiaro studies and Chapter 2 suggest that the co-occurrence of passive voice and reversibility is essential for reanalysis.
While the results of Chapter 3 concur with these findings, they also strongly indicate that these features must co-occur with a third factor, namely a non-canonical word-order, to trigger reanalysis. Lastly, the results of Chapter 4 clarify the l-pIPS’ involvement in sentence comprehension. However, it leaves the exact role of the l-pIPS unclear in comprehending reversible sentences without thematic role assignment. The current thesis has advanced our understanding of some key factors responsible for reanalysis, and its neural correlates. Future studies can aim to understand these factors better by exploiting parallel versions of the same sentence type, and by studying different sentence types in isolation. For example, Hindi passives can be presented in both agent-theme-action and theme-agent-action word-orders. Contrasting such versions may help answer questions pertaining to word-order. On the other hand, studying sentences like declaratives and comparatives in separate experiments or even separate sessions may help simplify stimuli, thereby giving us clearer results.
33
Chiana, Lorenzo. "Studio e sperimentazione di un algoritmo RTLS per il posizionamento indoor." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Find full textAbstract:
Il presente lavoro di tesi si occupa di sistemi RTLS, ossia sistemi di localizzazione in tempo reale che vengono impiegati per l'identificazione e il tracciamento automatico della posizione di oggetti o persone, tipicamente in ambienti indoor. La loro applicazione offre la possibilità di acquisire importati informazioni a supporto di funzioni di pianificazione, produzione, logistica, sicurezza, ottimizzazione operativa o di comprensione del comportamento di individui (e.g., clienti, collaboratori, etc.).
Questo elaborato riguarda lo studio di nuovi algoritmi nell'ambito di un progetto dell'azienda Forwardinnovation, che punta ad entrare nel mercato RTLS con un approccio innovativo rispetto ai competitor già presenti.
La validità della soluzione proposta è stata analizzata sia dal punto di vista economico, tramite un'analisi di mercato, che tecnico, provvedendo alla prototipazione di un algoritmo in linea con i requisiti forniti dall'azienda.
In questo lavoro di tesi, vengono pertanto descritti i diversi casi d'uso proposti, le tecnologie utilizzate e la relativa metodologia di risoluzione riportando i risultati ottenuti.
34
Huber, Nikolaus. "Porting Zephyr RTOS to the LEON/GRLIB SoC SPARC v8 architecture." Thesis, Luleå tekniska universitet, Rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76055.
Full textAbstract:
The aim of this thesis is to create a port of the Zephyr realtime operating systemfor the LEON processor platform. The LEON is a frequently used computing corefor spaceflight applications, with ample flight heritage. It is based upon the wellestablished SPARC v8 instruction set, and offers many extensions to ease softwaredevelopment and increase overall processor performance. An overview of the nec-essary steps towards a functional architecture port is given in this report. Specialemphasis is put upon the interrupt handling and context switching. One LEONspecific feature introduced with the GR716 LEON3-FT microcontroller, registerwindow partitioning, is used to increase the performance of the context switchingmechanism in the operating system. By using this feature, context switching timehas shown to decrease significantly, while easing verification of the overall softwaresystem by providing dedicated partitions for tasks with hard realtime requirements.Det övergripande målet med examensarbetet är att porta Zephyr realtidsopera-tivsystem (OS) till LEON processorplattformen. LEON processorn är ursprungligendesignad för och förekommer ofta i datorsystem inom rymd p.g.a. sina feltolerantaegenskaper. LEON är kompatibel med den öppna SPARC v8 instruktionsuppsät-tningen vilken också tillåter utökning och anpassningar. Rapporten ger läsaren enöverblick av vilka steg som är nödvändiga för att skapa en fungerande arkitektur-port av ett OS. Vidare beskriver rapporten mer i detalj designen kring trådväxlingoch avbrottshantering, samt hur dessa anpassas för att utnyttja LEON specifikautökningar av SPARC till att nå högre prestanda. GR716 LEON3-FT introducerarpartitionering av SPARC registerfönster för att kunna minska tiden det tar opera-tivsystemet att växla trådar. Denna funktion har inte använts tidigare i något OS,och är därför av särskilt intresse att studera och karakterisera. Resultaten visar atttrådväxlingstiden minskat signifikant, samtidigt som determinismen blivit bättreoch därigenom är det nu enklare att designa system med hårda realtidskrav.
35
Seewoo, Bhedita Jaya. "Resting state fMRI study of brain activation using rTMS in rats." Thesis, Seewoo, Bhedita Jaya (2016) Resting state fMRI study of brain activation using rTMS in rats. Honours thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/35040/.
Full textAbstract:
Background and purpose: Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive neuromodulation technique used to treat many neurological and psychiatric conditions. However, not much is known about the mechanisms underlying its efficacy because human rTMS studies are mostly non-invasive while most animal studies are invasive. Invasive animal studies allow for cellular and molecular changes to be detected and hence, have been able to show that rTMS may alter synaptic plasticity in the form of long-term potentiation. This is the first rodent study using non-invasive resting state functional magnetic resonance imaging (rs-fMRI) to examine the effects of low-intensity rTMS (LI-rTMS) in order to provide a more direct comparison to human studies.
Methods: rs-fMRI data were acquired before and after 10 minutes of LI-rTMS intervention at one of four frequencies—1 Hz, 10 Hz, biomimetic high frequency stimulation (BHFS) and continuous theta burst stimulation (cTBS)—in addition to sham. We used independent component analysis to uncover changes in the default mode network (DMN) induced by each rTMS protocol.
Results: There were considerable rTMS-related changes in the DMN. Specifically, (1) the synchrony of resting activity of the somatosensory cortex was decreased ipsilaterally following 10 Hz stimulation, increased ipsilaterally following cTBS, and decreased bilaterally following 1 Hz stimulation and BHFS; (2) the motor cortex showed bilateral changes following 1 Hz and 10 Hz stimulation, an ipsilateral increase in synchrony of resting activity following cTBS, and a contralateral decrease following BHFS; and (3) in the hippocampus, 10 Hz stimulation caused an ipsilateral decrease while 1 Hz and BHFS caused a bilateral decrease in synchrony. There was no change in the correlation of the hippocampus induced by cTBS.
Conclusion: The present findings suggest that LI-rTMS can modulate functional links within the DMN of rats. LI-rTMS can induce changes in the cortex, as well as in remote brain regions such as the hippocampus when applied to anaesthetised rats and the pattern of these changes depends on the frequency used, with 10 Hz stimulation, BHFS and cTBS causing mostly ipsilateral changes in synchrony of activity in the DMN and 1 Hz stimulation causing bilateral changes in synchrony, with the contralateral changes being more prominent than ipsilateral changes. Hence, combined rTMS-fMRI emerges as a powerful tool to visualise rTMS-induced cortical connectivity changes at a high spatio-temporal resolution and help unravel the physiological processes underlying these changes in the cortex and interconnected brain regions.
36
Zhang, Shuzhou. "Porting AUTOSAR to a high performance embedded system." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-21454.
Full textAbstract:
Automotive embedded systems are going through a major change, both in terms of how they are used and in terms of software and hardware architecture. Much more powerful and rapidly evolvable hardware is expected, paralleled by an accelerating development rate of the control software. To meet these challenges, a software standard, AUTOSAR, is gaining ground in the automotive field. In this work, experiences from porting AUTOSAR to a high performance embedded system, Raspberry Pi, are collected. The goal is both to present experience on the process of AUTOSAR porting and to create an AUTOSAR implementation on a cheap and widely accessible hardware platform, making AUTOSAR available for researchers and students.
37
Engström, Robin. "Evolution av styrbeteenden för trupper i RTS-spel." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-10999.
Full textAbstract:
Detta arbete undersöker om genetiska algoritmer kan användas för att evolvera parametrar för olika styrbeteenden. Arbetet fokuserar på truppförflyttningar i realtidsstrategisspel (RTS) där trupper av tolv agenter rör sig mellan två punkter i diverse miljöer. Agenterna tränas genom att evolvera styrbeteendeparametrar på små, specifika problem och utvärderas sedan på mer komplexa miljöer som inkluderar flera av de små träningsproblemen.Parameterevolutionen visar lovande resultat med avseende på att agenternas beteende förbättras. Evolutionen leder dock till oönskade bieffekter så som att agenterna föredrar att kollidera med hinder istället för att köra runt dem. Agenter tenderar dock att sporadiskt fastna i väggar vilket drastiskt påverkar resultatet i en negativ mening.Detta arbete saknar fokus för diverse fitnessfunktioner som kan påverka resultatet. Detta kan vara ett intressant fokus för framtida arbeten. Även mer komplexa styrbeteenden kan vara ett bra fokus för vidare studier för att låta agenter lösa mer komplexa problem.
38
Magnusson, Matteus, and Tobias Hall. "Adaptive goal oriented action planning for RTS games." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4361.
Full textAbstract:
This thesis describes the architecture of an adaptive goal-oriented AI system that can be used for Real-Time Strategy games. The system is at the end tested against a single opponent on three different maps with different sizes to test the ability of the AI opposed to the 'standard' Finite State Machines and the likes in Real-Time Strategy games. The system consists of a task handler agent that manages all the active and halted tasks. A task is either low-level; used for ordering units, or high-level that can form advanced strategies. The General forms plans that are most beneficial at the moment. For creating effective units against the opponent a priority system is used; where the unit priorities are calculated dynamically.Den här uppsatsen beskriver en adaptiv målorienterad AI-arkitektur som kan tillämpas på "Real-Time Strategy" spel. Systemet testat mot en annan AI som använder mer traditionella "Finite State Machines" in sin arkitekture. Testet utförs på tre olika banor som är olika stora. Systemet består utav en "Uppgiftshanterare" som har hand om alla aktiva och inaktiva uppgifter. En uppgift kan antingen vara utav låg-nivå, som används för att skicka kommandon till enheterna, eller utav hög-nivå för att göra mer avancerade strategier. Generalen planerar och skapar uppgifter som är mest fördelaktig för tillfället. För att skapa enheter som är effektiva mot fiendens enheter används ett prioritetssystem, där enhetens prioritet kalkyleras ut dynamiskt under spelets gång.
39
Hall, Tobias, and Matteus Magnusson. "Adaptive Goal Oriented Action Planning for RTS Games." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4362.
Full textAbstract:
This thesis describes the architecture of an adaptive goal-oriented AI system that can be used for Real-Time Strategy games. The system is at the end tested against a single opponent on three di erent maps with di erent sizes to test the ability of the AI opposed to the 'standard' Finite State Machines and the likes in Real-Time Strategy games. The system consists of a task handler agent that manages all the active and halted tasks. A task is either low-level; used for ordering units, or high-level that can form advanced strategies. The General forms plans that are most advantageous at the moment. For creating e ective units against the opponent a priority system is used; where the unit priorities are calculated dynamically.
40
Karlsson, Robin. "Cooperative Behaviors BetweenTwo Teaming RTS Bots in StarCraft." Thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-10955.
Full textAbstract:
Context. Video games are a big entertainment industry. Many video games let players play against or together. Some video games also make it possible for players to play against or together with computer controlled players, called bots. Artificial Intelligence (AI) is used to create bots. Objectives. This thesis aims to implement cooperative behaviors between two bots and determine if the behaviors lead to an increase in win ratio. This means that the bots should be able to cooperate in certain situations, such as when they are attacked or when they are attacking. Methods. The bots win ratio will be tested with a series of quantitative experiments where in each experiment two teaming bots with cooperative behavior will play against two teaming bots without any cooperative behavior. The data will be analyzed with a t-test to determine if the data are statistical significant. Results and Conclusions. The results show that cooperative behavior can increase performance of two teaming Real Time Strategy bots against a non-cooperative team with two bots. However, the performance could either be increased or decreased depending on the situation. In three cases there were an increase in performance and in one the performance was decreased. In three cases there was no difference in performance. This suggests that more research is needed for these cases.
41
Hendrickson, Benjamin William. "Dark Current RTS-Noise in Silicon Image Sensors." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4475.
Full textAbstract:
Random Telegraph Signal (RTS) noise is a random noise source defined by discrete and metastable changes in the magnitude of a signal. Though observed in a variety of physical processes, RTS is of particular interest to image sensor fabrication where progress in the suppression of other noise sources has elevated its noise contribution to the point of approaching the limiting noise source in scientific applications.
There have been two basic physical sources of RTS noise reported in image sensors. The first involves a charge trap in the oxide layer of the source follower in a CMOS image sensor. The capture and emission of a charge changes the conductivity across the source follower, altering the signal level. The second RTS source in image sensors has been reported in CCD and CMOS architectures and involves some metastability in the structure of the device within the light collection area.
A methodology is presented for the analysis of RTS noise. Utilizing wavelets, a time-based signal has white noise removed, while RTS transitions are preserved. This allows for the simple extraction of RTS parameters, which provide valuable insight into defects in semiconductor devices. The scheme is used to extract RTS transition amplitudes and time constants from radiation damaged CMOS image sensor pixels.
Finally, the generation of ionizing radiation induced RTS centers is investigated and discussed. Surprisingly, the number of RTS centers does not scale linearly with absorbed dose, but instead follows a quadratic dependence. The implications and possible mechanisms behind the generation of these RTS centers are discussed.
42
Magnusson, Fridrik. "Asynchronous message passing on a dual processor parallel system running a RTOS." Thesis, University of Skövde, Department of Computer Science, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-168.
Full textAbstract:
Interprocessor communication is a vital part of any multiprocessor system. This work focuses on integration of an asynchronous message passing mechanism and a message notification support in the form of limited hardware queues. To fulfill requirements the interprocessor communication must be predictable, efficient, maintain memory integrity, and use the semantics of the available message passing mechanism. Various solution possibilities are identified, evaluated and compared, resulting in a design recommendation. The design uses memory restriction to build a firewall between the processors, using pointers to avoid message copying. The message queue is in the form of an array ring that can piggyback acknowledgement information. The design is general and applicable by a real-time operating systems using asynchronous message passing with explicit buffering, and has hardware support in the form of limited interrupt generating queues.
43
Zabel, Henning [Verfasser]. "Techniken zur Simulation von eingebetteten Systemen mit abstrakten RTOS-Modellen / Henning Zabel." Aachen : Shaker, 2010. http://d-nb.info/1120864658/34.
Full text
44
Wörbel, Saskia [Verfasser]. "Modifikation des prämotorisch-parietalen Handlungsauswahlnetzwerks durch kombinierte Offline-online-rTMS / Saskia Wörbel." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1020615761/34.
Full text
45
Golombek, Thomas. "Die Rolle des linken Gyrus angularis beim auditiven Sprachverständnis: Eine rTMS-Studie." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-196955.
Full textAbstract:
Basierend auf der aktuellen Studienlage wurde versucht, Modellannahmen zum auditi- ven Sprachverständnisses weiter zu ergründen. Im Mittelpunkt stand dabei die Rolle des Gyrus angularis der sprachdominanten Hemisphäre bei der semantischen Integration von Worten in einen gegebenen Satzkontext. Zu diesem Zweck wurden 15 gesunde Proban- den mithilfe von repetitiver transkranieller Magnetstimulation (rTMS) in einem Sprach- verständnisexperiment untersucht. So konnte die funktionelle Relevanz der genannten Hirnregion in Abhängigkeit der Signalqualität des gehörten Satzes und des semanti- schen Kontextes untersucht werden. Zielparameter waren dabei der Anteil der korrekt wiederholten Wörter und Schlüsselwörter des Satzes sowie die Reaktionsgeschwindigkeit.
46
PINHEIRO, Guilherme Gonçalves. "Modelagem e Simulação de Sistemas Fotovoltaicos no RTDS – Um Estudo de Caso." reponame:Repositório Institucional da UNIFEI, 2016. http://repositorio.unifei.edu.br:8080/xmlui/handle/123456789/644.
Full textAbstract:
Submitted by repositorio repositorio (repositorio@unifei.edu.br) on 2017-02-01T16:48:14Z
No. of bitstreams: 1
dissertacao_pinheiro_2016.pdf: 8439339 bytes, checksum: 7dd1810669af16b61d7b5d05454b4871 (MD5)Made available in DSpace on 2017-02-01T16:48:14Z (GMT). No. of bitstreams: 1 dissertacao_pinheiro_2016.pdf: 8439339 bytes, checksum: 7dd1810669af16b61d7b5d05454b4871 (MD5) Previous issue date: 2016-11
Esta dissertação apresenta uma aplicação do RTDS (Real Time Digital Simulator) na modelagem, simulação e análise comparativa a medições de um sistema fotovoltaico instalado. Descreve uma breve revisão das literaturas atuais no desenvolvimento de conversores para conexão à rede de distribuição de sistemas fotovoltaicos, e também comentários sobre as regulamentações envolvidas no Brasil e internacionalmente. O objetivo principal é comparar medições do sistema fotovoltaico real instalado no Centro de Excelência em Redes Elétricas Inteligentes (CERIn) da Universidade Federal de Itajubá (UNIFEI) com um modelo computacional desenvolvido na plataforma RTDS. Determinam-se os parâmetros dos equipamentos envolvidos no sistema elétrico real através da análise das folhas dados dos fabricantes, incluindo: os painéis fotovoltaicos com as respectivas associações, os dois inversores CC-CA, os dois transformadores da subestação, a carga elétrica do CERIn, e o alimentador da distribuidora CEMIG. O projeto e sintonia dos controladores também é detalhado e modelado no RTDS. Por fim são apresentados os resultados do modelo computacional projetado e simulado através de um script desenvolvido no RUNTIME do software RSCAD da plataforma de simulação em tempo real RTDS. Este script coleta amostras em dois vetores de dados meteorológicos gerados pelas medições reais de dois dias distintos, e executa variações de irradiância e temperatura no modelo, referente a dois cenários: um dia nublado e um dia de sol. Com isso, variáveis medidas na saída dos inversores modelados são comparadas às medições reais, o que demonstrou boa convergência dos dados com a realidade. Sugestões para trabalhos futuros também são apresentadas no final deste trabalho.
47
Swegert, Eric B. "RTOS Tutorials for a Heterogeneous Class of Senior and Beginning Graduate Students." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367934958.
Full text
48
Sahraoui, Fouad. "Vers des nouveaux services RTOS offrant la fiabilisation des systèmes reconfigurable dynamiquement." Thesis, Cergy-Pontoise, 2016. http://www.theses.fr/2016CERG0819.
Full textAbstract:
Les systèmes électroniques sont de plus en plus présents dans les sociétés modernes, on peut les retrouver sous des formes très variées, très simple comme le réveil au chevet du lit ou très complexe comme un satellite de télécommunication en orbite. De nos jours, la majorité de ces inventions reposent en partie sur des "systèmes sur puces" afin de parvenir à accomplir leurs fonction principale, à savoir nous simplifier notre quotidien.Toutefois, à cause de leur nature physique, ces systèmes peuvent subir des dysfonctionnements dûs aux environnements dans lesquels ils évoluent. Des phénomènes naturels peuvent provoquer des aléas susceptibles d'avoir des conséquences graves sur la sûreté de fonctionnement du système.Cette thèse étudie la fiabilité d'une classe spécifique de systèmes sur puce capables de se reconfigurer partiellement de manière dynamique. Nous explorons la possibilité d'utiliser leur capacité de reconfiguration dynamique partielle (RDP) pour durcir les applications sur FPGAs. Nous avons proposé l'utilisation des approches de sauvegarde et de restauration de contexte pour la tolérance contre les fautes transitoire. La RDP est utilisée pour la gestion de contexte des tâches matérielles de l'application reconfigurable, le recours à la RDP permet de réduire les modifications à apporter au système initial et la complexité du système résultant. Après identification des limitations de l'approche "Backward Error Recovery" sur les plateformes FPGAs à base de mémoire SRAM, nous proposons un nouveau algorithme de placement des ressources sur FPGA afin de minimiser les temps d'accès des opérations de sauvegarde et de restauration d'une tâche matérielle. L'évaluation de la fiabilité de notre approche est réalisée à travers une campagne d'injection de faute sur une plateforme de démonstration basée sur un FPGA Virtex-5 qui intègre le contrôleur de fiabilité et une application de chiffrement de donnéesElectronic systems are a growing need in modern societies, they can be found in a variety of forms, simple as an Alarm Clock at the bedside or very complex as a telecommunications satellite into orbit. Today, the majority of these inventions are based mainly on "systems on chips", in order to achieve their primary function: simplify our daily lives.However, because of their physical nature, these systems can suffer from malfunctions due to the environments in which they operate. Natural phenomena can cause hazards which may have serious consequences on system dependability.This thesis focuses on a specific class of systems on chip which are able to reconfigure dynamically and partially and their reliability. We explore the possibility of using their partial dynamic reconfiguration capability (PDR) for hardening applications on FPGAs. We have proposed the use of checkpoint approaches and context restoration for tolerance against transient faults. PDR is used for managing the context of hardware tasks present on the application. the use of RDP reduces changes to the original system and therefore the complexity of the resulting system. After identifying the limitations of the "Backward Error Recovery" approach into SRAM-based FPGAs platforms, we propose a new resource placement algorithm on FPGA to minimize the access time needed by check-pointing and rolling back operations of hardware tasks. The evaluation of the overall reliability of our approach is achieved through fault injection campaign on demonstration platform running on a Virtex-5 that integrates our reliability controller and hosts a data encryption application
49
Marchesan, Almeida Gabriel. "Adaptive mpsoc architectures : principLes, methods and tools." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20154/document.
Full textAbstract:
Les systèmes multiprocesseurs sur puce (MPSoC) offrent des performances supérieures tout en conservant la flexibilité et la réutilisabilité grâce à la customisation du logiciel embarqué. Alors que la plupart de MPSoC sont aujourd'hui hétérogènes pour mieux répondre aux besoins des applications ciblées, les MPSoCs homogènes pourraient devenir dans un proche avenir une alternative viable apportant d'autres avantages tels que l'équilibrage de charge de l'exécution, la migration des tâches et l'ájustement de fréquence dynamique. Cette thèse s'appuie sur une plateforme MPSoC homogène, développée pour explorer techniques d'adaptation en ligne. Chaque processeur de ce système est compact et exécute un système d'exploitation préemptif qui surveille diverses métriques et est habilité à prendre des décisions de remapping grâce à des techniques de migration de code et du changement dynamique de la fréquence. Cette approche permet la mise en œuvre des capacités de raffinage d'application à l'exécution en fonction de différents critèresMultiprocessor Systems-on-Chip (MPSoC) offer superior performance while maintaining flexibility and reusability thanks to software oriented personalization. While most MPSoCs are today heterogeneous for better meeting the targeted application requirements, homogeneous MPSoCs may become in a near future a viable alternative bringing other benefits such as run-time load balancing, task migration and dynamic frequency scaling. This thesis relies on a homogeneous NoC-based MPSoC platform developed for exploring scalable and adaptive on-line continuous mapping techniques. Each processor of this system is compact and runs a tiny preemptive operating system that monitors various metrics and is entitled to take remapping decisions through code migration techniques and dynamic frequency scaling. This approach that endows the architecture with decisional capabilities permits refining application implementation at run-time according to various criteria
50
Borges, Rodrigo Weissmann. "Aplicabilidade de sistemas operacionais de tempo real (RTOS) para sistemas embarcados de baixo custo e pequeno porte." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18152/tde-09082011-081631/.
Full textAbstract:
Sistemas embarcados ganham cada vez mais espaço devido ao aumento da demanda por novas funções em equipamentos, às normas regulatórias e às novas necessidades dos consumidores e do mercado. Esse aumento nos requisitos aumenta o tamanho e a complexidade dos softwares embarcados cuja importância cresce significativamente. Sistemas operacionais de tempo real constituem uma ferramenta poderosa para gerenciar a complexidade, facilitar o reuso e aumentar a portabilidade do software e também reduzir o time-to-market. Este trabalho visa avaliar a aplicabilidade de sistemas operacionais de tempo real em sistemas embarcados de baixo custo que utilizam microprocessadores pequenos (8 e 16 bits), avaliando suas características e propondo as melhores alternativas para desenvolvimento de software embarcado. Para o atendimento desta proposta, foi realizado o levantamento de características sobre o desenvolvimento brasileiro de sistemas embarcados, uma análise das características de sistemas de pequeno porte, uma discussão da viabilidade do uso de RTOS e um estudo de caso comparando arquiteturas de software embarcado. Os resultados principais mostram que arquiteturas simplificadas como a Superloop apresentam vantagem sobre os sistemas operacionais devido ao baixo consumo de memória e processamento. Os sistemas operacionais, apesar de propiciarem desenvolvimentos de códigos modulares bem como facilitar o gerenciamento de tempo, são de difícil implementação em microcontroladores pequenos, devido ao seu elevado consumo de memória e processamento. O uso de sistemas operacionais é viável para sistemas de pequeno porte com no mínimo 4 Kbytes de memória RAM e processos com limite de tempo máximo para execução (deadlines) superiores a 1 ms, condições essas que evitam a sobrecarga do microcontrolador. Neste trabalho também é mostrado um retrato do desenvolvimento de embarcados no Brasil.Embedded systems, more and more are gaining importance, due to the increase of features requested on equipments, the regulatory standards and the costumers and market requirements. This increment on requirements increases the software size and complexity, which importance significantly grows. Real-time operating systems represents a powerful tool to manage the complexity, help the software reuse and improve portability of the software and also reduce the time-to-market. This work aims to analyze the real-time operating systems, verifying their application on low cost embedded systems using small microcontrollers (8 and 16-bit), evaluating their characteristics and propose the best architectures for software development. To attend this proposal, it was performed a survey of Brazilian embedded system development, evaluates the low cost embedded system characteristics, discusses the viability of RTOS usage and performs a comparative study of embedded software architectures. Results show that simplified architectures like the Superloop presents vantages over the operating systems due to their low memory and processing consumption. The operating system, besides helping on time management and code modularity, is difficult to implement in small microcontrollers, due to the high memory and processing consumption. The operating systems are more applicable to small embedded systems with at minimum 4 Kbytes of RAM memory and process with maximum execution time (deadlines) over 1 ms, conditions that do not causes microcontroller overload. In this work is also presented an overview of Brazilian embedded system development.