16 research outputs found
Cognitive Radio Systems
Cognitive radio is a hot research area for future wireless communications in the recent years. In order to increase the spectrum utilization, cognitive radio makes it possible for unlicensed users to access the spectrum unoccupied by licensed users. Cognitive radio let the equipments more intelligent to communicate with each other in a spectrum-aware manner and provide a new approach for the co-existence of multiple wireless systems. The goal of this book is to provide highlights of the current research topics in the field of cognitive radio systems. The book consists of 17 chapters, addressing various problems in cognitive radio systems
High-Performance Modelling and Simulation for Big Data Applications
This open access book was prepared as a Final Publication of the COST Action IC1406 “High-Performance Modelling and Simulation for Big Data Applications (cHiPSet)“ project. Long considered important pillars of the scientific method, Modelling and Simulation have evolved from traditional discrete numerical methods to complex data-intensive continuous analytical optimisations. Resolution, scale, and accuracy have become essential to predict and analyse natural and complex systems in science and engineering. When their level of abstraction raises to have a better discernment of the domain at hand, their representation gets increasingly demanding for computational and data resources. On the other hand, High Performance Computing typically entails the effective use of parallel and distributed processing units coupled with efficient storage, communication and visualisation systems to underpin complex data-intensive applications in distinct scientific and technical domains. It is then arguably required to have a seamless interaction of High Performance Computing with Modelling and Simulation in order to store, compute, analyse, and visualise large data sets in science and engineering. Funded by the European Commission, cHiPSet has provided a dynamic trans-European forum for their members and distinguished guests to openly discuss novel perspectives and topics of interests for these two communities. This cHiPSet compendium presents a set of selected case studies related to healthcare, biological data, computational advertising, multimedia, finance, bioinformatics, and telecommunications
Mobile Ad-Hoc Networks
Being infrastructure-less and without central administration control, wireless ad-hoc networking is playing a more and more important role in extending the coverage of traditional wireless infrastructure (cellular networks, wireless LAN, etc). This book includes state-of the-art techniques and solutions for wireless ad-hoc networks. It focuses on the following topics in ad-hoc networks: vehicular ad-hoc networks, security and caching, TCP in ad-hoc networks and emerging applications. It is targeted to provide network engineers and researchers with design guidelines for large scale wireless ad hoc networks
Energy-efficient Transitional Near-* Computing
Studies have shown that communication networks, devices accessing the Internet, and data centers account for 4.6% of the worldwide electricity consumption.
Although data centers, core network equipment, and mobile devices are getting more energy-efficient, the amount of data that is being processed, transferred, and stored is vastly increasing.
Recent computer paradigms, such as fog and edge computing, try to improve this situation by processing data near the user, the network, the devices, and the data itself.
In this thesis, these trends are summarized under the new term near-* or near-everything computing.
Furthermore, a novel paradigm designed to increase the energy efficiency of near-* computing is proposed: transitional computing.
It transfers multi-mechanism transitions, a recently developed paradigm for a highly adaptable future Internet, from the field of communication systems to computing systems.
Moreover, three types of novel transitions are introduced to achieve gains in energy efficiency in near-* environments, spanning from private Infrastructure-as-a-Service (IaaS) clouds, Software-defined Wireless Networks (SDWNs) at the edge of the network, Disruption-Tolerant Information-Centric Networks (DTN-ICNs) involving mobile devices, sensors, edge devices as well as programmable components on a mobile System-on-a-Chip (SoC).
Finally, the novel idea of transitional near-* computing for emergency response applications is presented
to assist rescuers and affected persons during an emergency event or a disaster, although connections to cloud services and social networks might be disturbed by network outages, and network bandwidth and battery power of mobile devices might be limited
Recent Developments in Smart Healthcare
Medicine is undergoing a sector-wide transformation thanks to the advances in computing and networking technologies. Healthcare is changing from reactive and hospital-centered to preventive and personalized, from disease focused to well-being centered. In essence, the healthcare systems, as well as fundamental medicine research, are becoming smarter. We anticipate significant improvements in areas ranging from molecular genomics and proteomics to decision support for healthcare professionals through big data analytics, to support behavior changes through technology-enabled self-management, and social and motivational support. Furthermore, with smart technologies, healthcare delivery could also be made more efficient, higher quality, and lower cost. In this special issue, we received a total 45 submissions and accepted 19 outstanding papers that roughly span across several interesting topics on smart healthcare, including public health, health information technology (Health IT), and smart medicine
Building a test bed for simulation analysis for the internet of things
Mestrado com dupla diplomação com a Universidade Tecnológica e Federal do ParanáThe Internet of Things (IoT) enables the mix between the physical and informational world. Physical objects will be able to see, hear, think together, share information and coordinate decisions, without human interference in a variety of domains. To enable this vision of IoT in large scale is expected of the equipment to be low-cost, mobile, power efficient, computational constrained, and wireless communication enabled.
This project performs an extensive overview of the state-of-the-art in communication technologies for IoT, simulation theory and tools. It also describes test bed for IoT simulation and its implementation.
The simulation was built with Castalia Simulator (i.e. Wireless Sensor Networks (WSN) network) and INET framework (i.e. IP network), both extends OMNeT++ features. There are two independent networks that communicate through files and exchange information about source, destination, payload and simulation time.
Analyzing the outputs is possible to assure that the routing protocol that is provided in the Castalia Simulator does not provide any advantage in terms of packets loss, packets reception or energy consumption.A Internet das Coisas (IoT) permite a mistura entre o mundo físico e informacional. Objetos físicos serão capazes de ver, ouvir, pensar juntos, compartilhar informações e coordenar decisões, sem interferência humana em uma variedade de domínios. Para permitir essa visão de IoT em larga escala, espera-se que o equipamento seja de baixo custo, móvel, eficiente em termos de energia, com restrições computacionais e possibilite a comunicação sem fio.
Este projeto faz uma extensa visão geral do estado da arte em tecnologias de comunicação para IoT, teoria de simulação e ferramentas. Também descreve o banco de testes para simulação de IoT e sua implementação.
A simulação foi construída com o Simulador Castalia (ou seja, rede WSN) e o framework INET (ou seja, rede IP), ambos estendem os recursos do OMNeT ++. Existem duas redes independentes que se comunicam através de arquivos e trocam informações sobre origem, destino, carga útil e tempo de simulação.
Analisando os resultados é possível garantir que o protocolo de roteamento que é fornecido no Simulador Castalia não oferece qualquer vantagem em termos de quebra de pacotes, recepção de pacotes ou consumo de energia
Nova combinação de hardware e de software para veículos de desporto automóvel baseada no processamento directo de funções gráficas
Doutoramento em Engenharia EletrónicaThe main motivation for the work presented here began with previously
conducted experiments with a programming concept at the time named
"Macro". These experiments led to the conviction that it would be possible to
build a system of engine control from scratch, which could eliminate many of
the current problems of engine management systems in a direct and intrinsic
way. It was also hoped that it would minimize the full range of software and
hardware needed to make a final and fully functional system.
Initially, this paper proposes to make a comprehensive survey of the state of
the art in the specific area of software and corresponding hardware of
automotive tools and automotive ECUs. Problems arising from such software
will be identified, and it will be clear that practically all of these problems stem
directly or indirectly from the fact that we continue to make comprehensive use
of extremely long and complex "tool chains". Similarly, in the hardware, it will
be argued that the problems stem from the extreme complexity and
inter-dependency inside processor architectures. The conclusions are
presented through an extensive list of "pitfalls" which will be thoroughly
enumerated, identified and characterized.
Solutions will also be proposed for the various current issues and for the
implementation of these same solutions. All this final work will be part of a
"proof-of-concept" system called "ECU2010". The central element of this
system is the before mentioned "Macro" concept, which is an graphical block
representing one of many operations required in a automotive system having
arithmetic, logic, filtering, integration, multiplexing functions among others. The
end result of the proposed work is a single tool, fully integrated, enabling the
development and management of the entire system in one simple visual
interface. Part of the presented result relies on a hardware platform fully
adapted to the software, as well as enabling high flexibility and scalability in
addition to using exactly the same technology for ECU, data logger and
peripherals alike.
Current systems rely on a mostly evolutionary path, only allowing online
calibration of parameters, but never the online alteration of their own
automotive functionality algorithms. By contrast, the system developed and
described in this thesis had the advantage of following a "clean-slate"
approach, whereby everything could be rethought globally. In the end, out of all
the system characteristics, "LIVE-Prototyping" is the most relevant feature,
allowing the adjustment of automotive algorithms (eg. Injection, ignition,
lambda control, etc.) 100% online, keeping the engine constantly working,
without ever having to stop or reboot to make such changes. This consequently
eliminates any "turnaround delay" typically present in current automotive
systems, thereby enhancing the efficiency and handling of such systems.A principal motivação para o trabalho que conduziu a esta tese residiu na
constatação de que os actuais métodos de modelação de centralinas
automóveis conduzem a significativos problemas de desenvolvimento e
manutenção. Como resultado dessa constatação, o objectivo deste trabalho
centrou-se no desenvolvimento de um conceito de arquitectura que rompe
radicalmente com os modelos state-of-the-art e que assenta num conjunto de
conceitos que vieram a ser designados de "Macro" e "Celular ECU". Com este
modelo pretendeu-se simultaneamente minimizar a panóplia de software e de
hardware necessários à obtenção de uma sistema funcional final.
Inicialmente, esta tese propõem-se fazer um levantamento exaustivo do
estado da arte na área específica do software e correspondente hardware das
ferramentas e centralinas automóveis. Os problemas decorrentes de tal
software serão identificados e, dessa identificação deverá ficar claro, que
praticamente todos esses problemas têm origem directa ou indirecta no facto
de se continuar a fazer um uso exaustivo de "tool chains" extremamente
compridas e complexas. De forma semelhante, no hardware, os problemas
têm origem na extrema complexidade e inter-dependência das arquitecturas
dos processadores. As consequências distribuem-se por uma extensa lista de
"pitfalls" que também serão exaustivamente enumeradas, identificadas e
caracterizadas.
São ainda propostas soluções para os diversos problemas actuais e
correspondentes implementações dessas mesmas soluções. Todo este
trabalho final faz parte de um sistema "proof-of-concept" designado
"ECU2010". O elemento central deste sistema é o já referido conceito de
“Macro”, que consiste num bloco gráfico que representa uma de muitas
operações necessárias num sistema automóvel, como sejam funções
aritméticas, lógicas, de filtragem, de integração, de multiplexagem, entre
outras. O resultado final do trabalho proposto assenta numa única ferramenta,
totalmente integrada que permite o desenvolvimento e gestão de todo o
sistema de forma simples numa única interface visual. Parte do resultado
apresentado assenta numa plataforma hardware totalmente adaptada ao
software, bem como na elevada flexibilidade e escalabilidade, para além de
permitir a utilização de exactamente a mesma tecnologia quer para a
centralina, como para o datalogger e para os periféricos.
Os sistemas actuais assentam num percurso maioritariamente evolutivo,
apenas permitindo a calibração online de parâmetros, mas nunca a alteração
online dos próprios algoritmos das funcionalidades automóveis. Pelo contrário,
o sistema desenvolvido e descrito nesta tese apresenta a vantagem de seguir
um "clean-slate approach", pelo que tudo pode ser globalmente repensado. No
final e para além de todas as restantes características, o
“LIVE-PROTOTYPING” é a funcionalidade mais relevante, ao permitir alterar
algoritmos automóveis (ex: injecção, ignição, controlo lambda, etc.) de forma
100% online, mantendo o motor constantemente a trabalhar e sem nunca ter
de o parar ou re-arrancar para efectuar tais alterações. Isto elimina
consequentemente qualquer "turnaround delay" tipicamente presente em
qualquer sistema automóvel actual, aumentando de forma significativa a
eficiência global do sistema e da sua utilização
Building Evacuation with Mobile Devices
In der Dissertation wird ein Konzept für ein Gebäudeevakuierungssystem vorgestellt, das es ermöglicht, Personen mit Hilfe mobiler Endgeräte im Evakuierungsfall aus einem Gebäude zu führen. Die Dissertation gliedert sich in drei thematische Bereiche, in denen zunächst ein Konzept für die Systemarchitektur vorgestellt wird und anschließend verschiedene Algorithmen zur Routenplanung sowie zur Lokalisierung der Geräte vorgestellt und evaluiert werden
Analysis and Modeling of False Synchronizations in 3G- WLAN Integrated Networks
Abstract. Recently, a set of problems have been solved analytically, in order to improve various aspects of the authentication procedure in mobile networks. In these problems, an analytical model is derived, which is used to draw guidelines on the selection of the appropriate value of various system parameters. We observe that all these problems can be solved using a generic modeling procedure that is based on Markov chains assuming exponential distributions. In this paper we apply this generic modeling procedure to the problem of false synchronizations in 3G-WLAN integrated networks. To this end, we first elaborate on false synchronization using a numerical example that facilitates the better understanding of the presented notions. Then, an analytical model based on a four dimensional Markov chain is developed, using the generic modeling procedure, whose accuracy is verified through simulations