1,525 research outputs found
Exploiting affinity propagation for energy-efficient information discovery in sensor networks
Wireless sensor networks (WSN) are attractive for information gathering in large-scale data rich environments. Emerging WSN applications require dissemination of information to interested clients within the network requiring support for differing traffic patterns. Further, in-network query processing capabilities are required for autonomic information discovery. In this paper, we formulate the information discovery problem as a load-balancing problem, with the combined aim being to maximize network lifetime and minimize query processing delay. We propose novel methods for data dissemination, information discovery and data aggregation that are designed to provide significant QoS benefits. We make use of affinity propagation to group "similar" sensors and have developed efficient mechanisms that can resolve both ALL-type and ANY-type queries in-network with improved energy-efficiency and query resolution time. Simulation results prove the proposed method(s) of information discovery offer significant QoS benefits for ALL-type and ANY-type queries in comparison to previous approaches.<br /
Mobile Computing in Digital Ecosystems: Design Issues and Challenges
In this paper we argue that the set of wireless, mobile devices (e.g.,
portable telephones, tablet PCs, GPS navigators, media players) commonly used
by human users enables the construction of what we term a digital ecosystem,
i.e., an ecosystem constructed out of so-called digital organisms (see below),
that can foster the development of novel distributed services. In this context,
a human user equipped with his/her own mobile devices, can be though of as a
digital organism (DO), a subsystem characterized by a set of peculiar features
and resources it can offer to the rest of the ecosystem for use from its peer
DOs. The internal organization of the DO must address issues of management of
its own resources, including power consumption. Inside the DO and among DOs,
peer-to-peer interaction mechanisms can be conveniently deployed to favor
resource sharing and data dissemination. Throughout this paper, we show that
most of the solutions and technologies needed to construct a digital ecosystem
are already available. What is still missing is a framework (i.e., mechanisms,
protocols, services) that can support effectively the integration and
cooperation of these technologies. In addition, in the following we show that
that framework can be implemented as a middleware subsystem that enables novel
and ubiquitous forms of computation and communication. Finally, in order to
illustrate the effectiveness of our approach, we introduce some experimental
results we have obtained from preliminary implementations of (parts of) that
subsystem.Comment: Proceedings of the 7th International wireless Communications and
Mobile Computing conference (IWCMC-2011), Emergency Management: Communication
and Computing Platforms Worksho
Towards a network management solution for vehicular delay-tolerant networks
Vehicular networks appeared as a new communication solution where vehicles act as a communication infrastructure, providing data communications through vehicle-to-vehicle (V2V) or vehicle-to-infrastructure (V2I) communications. Vehicular Delay-Tolerant Networks (VDTNs) are a new disruptive network architecture assuming delay tolerant networking paradigm where there are no end-to-end connectivity. In this case the incial node transmits the data to a closed node, the data will be carried by vehicles, hop to hop until the destination.
This dissertation focuses on a proposal of a network management solution, based standard protocol Simple Network Management Protocol (SNMP) to VDTN networks. The developed solution allows control a VDTN netowork through a Network Management System (NMS) with the objective to detect and, if it’s possible, anticipate, possible errors on network.
The research methodology used was the prototyping. So, it was built a network management module to the laboratorial prototype, called VDTN@Lab. The system built include a MIB (Management Information Base) placed in all vehicular network nodes. The solution was built, demonstrated, validated and evaluated their performance, being ready for use.As redes veiculares foram desenhadas para permitir que os veĂculos possam
transportar dados criando assim um novo tipo de redes, caracterizando-se por dois tipos de
comunicação: comunicações veĂculo-para-veĂculo (V2V) ou comunicações veĂculo-parainfra-estrutura (V2I). Redes veiculares intermitentes (do InglĂŞs Vehicular Delay-Tolerant
Networks - VDTNs) surgiram como uma nova arquitectura de rede de dados onde os
veĂculos sĂŁo utilizados como infra-estruturas de comunicação. As VDTNs caracterizam-se
por serem redes veiculares baseadas no paradigma de comunicações intermitentes. Nas
redes VDTN não existe uma ligação permanente extremo a extremo entre o emissor e o
receptor. Neste caso, o nĂł inicial transmite os dados para um nĂł que esteja junto dele e
assim sucessivamente, os dados vĂŁo sendo transportados pelos veĂculos, salto a salto atĂ©
ao destinatário final.
Esta dissertação centra-se na proposta de uma solução de gestão de rede, baseada
no protocolo estandardizado Simple Network Management Protocol (SNMP) para redes
VDTN. A solução construĂda permite controlar uma rede VDTN atravĂ©s de um sistema de
gestĂŁo de rede (do InglĂŞs Network Management System - NMS) com o objectivo de
detectar e, se possĂvel antecipar, possĂveis erros na rede.
A metodologia de investigação utilizada foi a prototipagem. Assim, foi construĂdo
um mĂłdulo de gestĂŁo de redes para o protĂłtipo laboratorial, chamado VDTN@Lab. O
sistema construĂdo inclui uma MIB (Management Information Base) que Ă© colocada em
todos os nĂłs de uma rede veicular, tanto fixos como mĂłveis. A solução foi construĂda,
demonstrada, validade e avaliado o seu desempenho, estando assim pronta para ser
utilizada
A Comprehensive Approach to WSN-Based ITS Applications: A Survey
In order to perform sensing tasks, most current Intelligent Transportation Systems (ITS) rely on expensive sensors, which offer only limited functionality. A more recent trend consists of using Wireless Sensor Networks (WSN) for such purpose, which reduces the required investment and enables the development of new collaborative and intelligent applications that further contribute to improve both driving safety and traffic efficiency. This paper surveys the application of WSNs to such ITS scenarios, tackling the main issues that may arise when developing these systems. The paper is divided into sections which address different matters including vehicle detection and classification as well as the selection of appropriate communication protocols, network architecture, topology and some important design parameters. In addition, in line with the multiplicity of different technologies that take part in ITS, it does not consider WSNs just as stand-alone systems, but also as key components of heterogeneous systems cooperating along with other technologies employed in vehicular scenarios
Using tracked mobile sensors to make maps of environmental effects
We present a study the results of a study of environmental carbon monoxide pollution that has uses a set of
tracked, mobile pollution sensors. The motivating concept is that we will be able to map pollution and other
properties of the real world a fine scale if we can deploy a large set of sensors with members of the general public
who would carry them as they go about their normal everyday activities. To prove the viability of this concept
we have to demonstrate that data gathered in an ad-hoc manner is reliable enough in order to allow us to
build interesting geo-temporal maps.
We present a trial using a small number of global positioning system-tracked CO sensors. From analysis of raw
GPS logs we find some well-known spatial and temporal properties of CO. Further, by processing the GPS logs
we can find fine-grained variations in pollution readings such as when crossing roads. We then discuss the space
of possibilities that may be enabled by tracking sensors around the urban environment – both in getting at personal
experience of properties of the environment and in making summative maps to predict future conditions.
Although we present a study of CO, the techniques will be applicable to other environmental properties such as
radio signal strength, noise, weather and so on
Adoption of vehicular ad hoc networking protocols by networked robots
This paper focuses on the utilization of wireless networking in the robotics domain. Many researchers have already equipped their robots with wireless communication capabilities, stimulated by the observation that multi-robot systems tend to have several advantages over their single-robot counterparts. Typically, this integration of wireless communication is tackled in a quite pragmatic manner, only a few authors presented novel Robotic Ad Hoc Network (RANET) protocols that were designed specifically with robotic use cases in mind. This is in sharp contrast with the domain of vehicular ad hoc networks (VANET). This observation is the starting point of this paper. If the results of previous efforts focusing on VANET protocols could be reused in the RANET domain, this could lead to rapid progress in the field of networked robots. To investigate this possibility, this paper provides a thorough overview of the related work in the domain of robotic and vehicular ad hoc networks. Based on this information, an exhaustive list of requirements is defined for both types. It is concluded that the most significant difference lies in the fact that VANET protocols are oriented towards low throughput messaging, while RANET protocols have to support high throughput media streaming as well. Although not always with equal importance, all other defined requirements are valid for both protocols. This leads to the conclusion that cross-fertilization between them is an appealing approach for future RANET research. To support such developments, this paper concludes with the definition of an appropriate working plan
Every Cloud Has a Push Data Lining: Incorporating Cloud Services in a Context-Aware Application
We investigated context-awareness by utilising multiple sources of context in a mobile device setting. In our experiment we developed a system consisting of a mobile client, running on the Android platform, integrated with a cloud-based service. These components were integrated using pushmessaging technology.One of the key featureswas the automatic adaptation of smartphones in accordance with implicit user needs. The novelty of our approach consists in the use of multiple sources of context input to the system, which included the use of calendar data and web based user configuration tool, as well as that of an external, cloud-based, configuration file storing user interface preferences which, pushed at log-on time irrespective of access device, frees the user from having to manually configure its interface.The systemwas evaluated via two rounds of user evaluations (n = 50 users), the feedback of which was generally positive and demonstrated the viability of using cloud-based services to provide an enhanced context-aware user experience
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