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Workflows are becoming an increasingly more common paradigm to manage and control scientific applications. They are an effective technology to define composition of different pieces of knowledge, both in the application domain and in the scientific context. However, workflows are addressed in a number of different perspectives and little consensus has been reached yet on the specification, languages,...
Nowadays, the desire to embed more applications in systems as small as smart cards or sensors is growing. However, physical limitations of these systems, like very small main memory, and their cost of production make this very difficult to achieve. One solution is to execute code from a secondary memory, cheaper, denser, but slower, such as NAND Flash. Solutions based on Demand-Paging and using a...
Nowadays, Short Message Service (SMS) still represents the most used mobile messaging service. SMS messages are used in many different application fields, even in cases where security features, such as authentication and confidentiality between the communicators, must be ensured. Unfortunately, the SMS technology does not provide a built-in support for any security feature. This work presents SEESMS...
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...
The main intention of this paper is to introduce a new role-based approach to self-healing monitoring. Together with that we are going to provide an overview of the existing approaches to the monitoring of distributed systems using self healing features. Starting with a discussion of autonomous monitoring systems - the ones that do not need any user interaction to make a decision, we will come to...
This paper considers parallel Grobner bases algorithms on distributed memory parallel computers with multi-core compute nodes. We improve the pure distributed algorithm by an hybrid approach where on the compute nodes parallel threads for each available processor can be used. With this algorithm only one communication channel between the master node and the worker nodes is needed. By this we also...
This work analyses the performance of Hadoop, an implementation of the MapReduce programming model for distributed parallel computing, executing on a virtualisation environment comprised of 1 + 16 nodes running the VMWare workstation software. A set of experiments using the standard Hadoop benchmarks has been designed in order to determine whether or not significant reductions in the execution time...
The shared data programming model is an attractive grid programming alternative to message passing solutions. This paper addresses type related improvements to a shared data grid programming model, by taking advantage of particular interactions patterns and object semantics which result in a broader set of specialized objects. We present analysis aspects of GUN, a grid service layer solution for shared...
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