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Complex scientific workflows are now commonly executed on global grids. With the increasing scale complexity, heterogeneity and dynamism of grid environments the challenges of managing and scheduling these workflows are augmented by dependability issues due to the inherent unreliable nature of large-scale grid infrastructure. In addition to the traditional fault tolerance techniques, specific checkpoint-recovery...
Recent technological advances have lead to the emergence of wireless sensor and actor networks (WSAN) which sensors gather the information for an event and actors perform the appropriate actions. Since sensors are prone to failure due to energy depletion, hardware failure, and communication link errors, designing an efficient fault tolerance mechanism becomes an important issue in WSAN. However, most...
Security-by-Contract (S??C) is a paradigm providing security assurances for mobile applications. In this work, we present an extension of S??C enriched with an automatic trust management infrastructure. Indeed, we enhance the already existing architecture by adding new modules and configurations for contracts managing. At deploy-time, our system decides the run-time configuration depending on the...
A new parallel programming framework for DNA sequence alignment in homogeneous multi-core processor architectures is proposed. Contrasting with traditional coarse-grained parallel approaches, that divide the considered database in several smaller subsets of complete sequences to be aligned with the query sequence, the presented methodology is based on a slicing procedure of both the query and the...
Sequence alignment is a fundamental instrument in bioinformatics. In recent years, numerous proposals have been addressing the problem of accelerating this class of applications. This, due to the rapid growth of sequence databases in combination with the high computational demands imposed by the algorithms. In this paper we focus on the analysis of the progressive alignment in ClustalW, a widely used...
With the development of e-science, more and more attention is drawn to the visualization and interoperation of scientific data. Integrating Data Grid technology and Geographical Information System (GIS) offers a well solution to implement e-science applications. Utilizing Data Grid technology could take advantages to share heterogeneous and distributed data sources. GIS provides visualization environment...
Resource planning and scheduling for a given job is a central issue in the scientific problem solving Grid oriented environments. The workflow oriented approach to this issue has the advantage of efficient allocation of resources at the workflow level by revising the allocation solution at the task level based on requirements of subsequent tasks. The PEGAF project aims at providing a platform for...
In order to meet the greater than ever before integration and consolidation needs, enterprises are migrating towards SOA-based models. Besides, driven by the dissemination of more refined mobile devices in the enterprise, and the rapid growth of wireless networks based on IEEE 802.11 WiFi Standards, mobile applications have been increasingly used in mission-critical business applications. The SOA-based...
Technological advances in wireless networks and mobile devices are driving towards a new concept of grid computing, in which mobile users play an active role. For this reason, classical wired grid infrastructures are being extended in order to provide facilities which enable mobile users to exploit services available in the environment. Since grid computing borrows such facilities from pervasive computing,...
Ultra large scale (ULS) systems are future software intensive systems that have billions of lines of code, composed of heterogeneous, changing, inconsistent and independent elements that are dispersed through worldwide global networks. Huge scale of this heterology in addition to distinctive characteristics like decentralization of operation, management, deployment and evolution, continuous evolving,...
GPS - Radio Occultation is a remote sensing technique aim to characterize some atmospheric parameters. It is based on the analysis of the time evolution measurable on the GPS signal received on-board a Low Earth Orbit satellite. Result of analysis is the atmospheric refractivity profile which, in turn, can be used to characterize temperature, pressure and humidity profiles. This paper present the...
Field workforces have to implement day-to-day control decisions to keep the large scale real-world systems (e. g. Water Distribution Systems) operational. However, existing customized Decision Support Tools (DSTs) for field workforces operate on static and predefined datasets, available in the workers' devices. This results in planning control actions that may appear safe in the local context but...
The cloud paradigm appeared on the computing scene in 2005 with the Amazon Elastic Compute Cloud (EC2). After this date, a large set of related technologies has been developed. In the academic world, and especially in the HPC area, cloud computing is in some way in competition with the GRID model, which offers a middleware based approach. One of the solutions proposed is the integration of the two...
The highly distributed nature and the load sensitivity of Service Oriented Architectures (SOA) make it very difficult to guarantee performance requirements under rapidly-changing load conditions. This paper deals with the development of service oriented autonomic systems that are capable to optimize themselves using a feed forward approach, by exploiting automatically generated performance predictions...
Distributed systems have been developing rapidly in the past few years and their automatic control is a real challenge being a very active research field. In order to assure the load balancing and to optimize the resource utilization, a distributed system is using different software components, such as management tools, schedulers or monitoring tools. Considering the prediction of future behavior...
For constantly changing businesses, it is essential that the underlying software architecture is capable of managing agile business processes and meeting future business needs. Decoupling between applications and services in distributed systems is addressed by e. g., service-oriented architectures. On the other hand, applications and its underlying middleware are still tightly coupled with respect...
The SERSCIS project aims to support the use of interconnected systems of services in Critical Infrastructure (CI) applications. The problem of system interconnectedness is aptly demonstrated by 'Airport Collaborative Decision Making' (A-CDM). Failure or underperformance of any of the interlinked ICT systems may compromise the ability of airports to plan their use of resources to sustain high levels...
The SEMAT project is a multi-institution/multi-discipline program developing advanced wireless sensor networks to collect, store, process and interpret data in coastal systems. The marine environment, specifically coral reefs within the Great Barrier Reef, is one of the initial deployments for a prototype SEMAT network. Wireless sensor networks are being deployed to extract environmental data for...
Location and manipulation of complex data is a difficult, challenging task in nowadays extremely complex IT systems and on the Internet, overwhelmed with a huge amount of information that develops and grows rapidly. In this paper, we propose a self-organizing approach that combines purely decentralized unstructured P2P with space based computing in order to locate effectively and filter (retrieve)...
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