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Information sharing in dynamic mobile ad-hoc networks is a challenging task. High data availability in the presence of short and long term disconnections can be obtained by replicating shared data. The number of replicas must however be balanced against the cost of consistency management. In the MIDAS Data Space (MDS) we use optimistic replication together with internal versioning of data; this allows...
An approach to information sharing in mobile ad hoc networks (MANETs) used e.g. in rescue operations, is to store on every node a small amount of metadata describing what information resources exist in the network and where they reside, allowing applications to first search locally for information about suitable resources, and next request relevant information from a node that contains the resource...
Mobile ad-hoc networks have emerged as an efficient solution for communicating in critical scenarios, such as emergency and rescue operations. However, the infrastructure-less and dynamic nature of these networks make them vulnerable to network partitions, which directly affects the data delivery process. To mitigate the impact of partitioning, we introduce a new architecture that employs sensors...
Mobile ad-hoc networks (MANETs) are a natural candidate for communication and information exchange in emergency and rescue operations. The personnelpsilas movements, network disruptions and other system dynamics make it hard to implement robust applications for such environments. The MIDAS project aims at creating a middleware platform to simplify the task of developing and deploying mobile and robust...
Efficient information sharing is very important for emergency and rescue operations. Mobile ad-hoc Networks (MANETs) are often the only network environment for such operations. We have developed the MIDAS data space (MDS) to transparently share information among rescue applications in such environments. To achieve the required level of availability for important information, MDS performs optimistic...
This paper deals with basic performance of a design of a two-pole three-phase 40 MVA synchronous generator designed for special operating conditions in laboratory for testing high power transformers. The generator is designed to test three-phase and single-phase transformers aimed to work within 50 Hz and 60 Hz network frequency. This means that the generator will operate at two nominal speeds, at...
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