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Ionospheric scintillation monitoring is becoming an increasing research activity in order to devise countermeasures to the harmful effects ionospheric activity has on positioning services based on Global Navigation Satellite Systems (GNSS). The amount of amplitude fluctuations in GNSS signals due to scintillation is estimated by the �������� index. For this purpose, traditional closed loop architectures...
A hierarchical monitoring architecture is proposed in this paper. Monitoring information can be filtered and correlated at each hierarchical level guaranteeing high scalability of the management plane. Simulations, based on measurements on a commercial system, show such high scalability.
Ionospheric scintillation monitoring is becoming an increasing research activity in order to devise countermeasures to the harmful effects ionospheric activity has on positioning services based on Global Navigation Satellite Systems (GNSS). The amount of amplitude fluctuations in GNSS signals due to scintillation is estimated by the �������� index. For this purpose, traditional closed loop architectures...
A receiver autonomous integrity monitoring (RAIM) algorithm for vector tracking loop receivers is developed. It is shown that vector RAIM is not a simple remapping of ideas from scalar loop RAIM. Notably, it is shown that pseudorange residuals are not ideal for generating the test statistic in a vector receiver. Also, since vector receivers with integrity monitoring may use a recursive, multirate...
With the shift towards cloud computing, application availability becomes a valid concern. Cloud applications have to be taken down to address various hardware and software problems. Even thoug redundancy insulates applications from hardware errors, the software updates and patches still require the service to be taken down for the period of the update. Organizations generally use lowactivity hours...
Task migration is a well-known strategy adopted in distributed systems for load balancing. but the adoption of such strategy in NoC-based MPSoC is scarce in the literature. This paper proposes a complete task migration protocol for NoC-based MPSoCs. The migration transfers the task code, data and context to another PE. The paper presents the communication strategy to ensure coherence in the messages...
This paper describes a design of a data logger based system dedicated to vehicle trajectory monitoring. The system evaluation is based on prototyping an embedded application. The adopted architecture allows tests and applications and results are obtained with a set of constraints. In this multisensors architecture, a GPS receiver is used for the absolute localization. In order to integrate the GPS...
Web services framework has evolved as an emerging distributed middleware technology that uses a simple XML-based protocol to allow heterogeneous applications to exchange data across the Web. It provides a loose coupled and implementation neutral infrastructure for distributed applications. On the other hand, multi-agent autonomic architectures have evolved to provide self-management in the software...
This paper describes a methodology for building a reliable internet core router that considers the vulnerability of its electronic components to single event upset (SEU). It begins with a set of meaningful system level metrics that can be related to product reliability requirements. A specification is then defined that can be effectively used during the system architecture, silicon and software design...
The Open Distributed Processing Reference Model (ODP-RM) provides viewpoints and abstract infrastructure guidelines that can be used for a basis for enterprise architecture, especially for an inter-enterprise architecture. The ODP-RM does not prescribe methodology for modeling itself, but provides common vocabulary and focus for description. This paper performs a brief analysis of the ODP-RM (and...
This paper presents a distributed fermat-point range estimation strategy, which is important in the moving sensor localization applications. The fermat-point is defined as a point which minimizes the sum of distances from three sensors inside a triangle. This point is indeed at the trianglepsilas center of gravity. We solve the problems of large errors and poor performance in the bounding box algorithm...
The application of component repository has become more and more popular in the practice of component-based software development. Most of the repositories are physically isolated and vary in the classification and specification mechanisms, forming a distributed and heterogeneous network, which hinders the share and reusability of component resource. Therefore, it is important to integrate the distributed...
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