Grid applications require computing, storage and network resources offered from different Resourc... more Grid applications require computing, storage and network resources offered from different Resource Centers (RCs). For the exchange of resources and the data transfers between two RCs an end-to-end path should be created. To provide QoS assurances to this end-to-end path, the complete path should be reserved and configured to offer that particular service and the global network setup should be compliant and aware of the service offered. In this paper we propose a coupled procedure for the establishment of end to end Service Level Agreements (SLAs) along with the service provisioning in order to assure that the service and network providers comply with the level of QoS that the applications expect along the path. These SLAs stipulate the appropriate requirements for service availability and performance providing guarantees for the delay, inter packet delay variation, packet loss and capacity.
Studies in health technology and informatics, 2000
We present a distributed architectural framework for Primary Health Care (PHC) Centres. Distribut... more We present a distributed architectural framework for Primary Health Care (PHC) Centres. Distribution is handled through the introduction of the Roaming Electronic Health Care Record (R-EHCR) and the use of local caching and incremental update of a global index. The proposed architecture is designed to accommodate a specific PHC workflow model. Finally, we discuss a pilot implementation in progress, which is based on CORBA and web-based user interfaces. However, the conceptual architecture is generic and open to other middleware approaches like the DHE or HL7.
11th IEEE Symposium on Computers and Communications (ISCC'06), 2006
The spread of active attacks has become a frequent cause of vast systems breakdown in modern comm... more The spread of active attacks has become a frequent cause of vast systems breakdown in modern communication networks. In this paper, we first present a probabilistic modeling framework for the propagation of an energy-constrained mobile threat in a wireless ad hoc network. The introduced formulation is used to identify and evaluate different attack strategies and approaches, which in turn can
Grid applications require computing, storage and network resources offered from different Resourc... more Grid applications require computing, storage and network resources offered from different Resource Centers (RCs). For the exchange of resources and the data transfers between two RCs an end-to-end path should be created. To provide QoS assurances to this end-to-end path, the complete path should be reserved and configured to offer that particular service and the global network setup should be compliant and aware of the service offered. In this paper we propose a coupled procedure for the establishment of end to end Service Level Agreements (SLAs) along with the service provisioning in order to assure that the service and network providers comply with the level of QoS that the applications expect along the path. These SLAs stipulate the appropriate requirements for service availability and performance providing guarantees for the delay, inter packet delay variation, packet loss and capacity.
Studies in health technology and informatics, 2000
We present a distributed architectural framework for Primary Health Care (PHC) Centres. Distribut... more We present a distributed architectural framework for Primary Health Care (PHC) Centres. Distribution is handled through the introduction of the Roaming Electronic Health Care Record (R-EHCR) and the use of local caching and incremental update of a global index. The proposed architecture is designed to accommodate a specific PHC workflow model. Finally, we discuss a pilot implementation in progress, which is based on CORBA and web-based user interfaces. However, the conceptual architecture is generic and open to other middleware approaches like the DHE or HL7.
11th IEEE Symposium on Computers and Communications (ISCC'06), 2006
The spread of active attacks has become a frequent cause of vast systems breakdown in modern comm... more The spread of active attacks has become a frequent cause of vast systems breakdown in modern communication networks. In this paper, we first present a probabilistic modeling framework for the propagation of an energy-constrained mobile threat in a wireless ad hoc network. The introduced formulation is used to identify and evaluate different attack strategies and approaches, which in turn can
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Papers by Maria Grammatikou