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We present the design, implementation and evaluation of DevCom, a network system that provides users with a trustworthy and user-friendly way to communicate, share and collaborate among distinct groups of devices simultaneously, e.g., home devices, work devices and friends’ devices. DevCom is trustworthy, because reliability, security and privacy issues are automatically taken care of with state-of-the-art...
In dynamic networks like sparse mobile ad hoc networks used during rescue operations, data and service availability and reachability is crucial. Such dynamic networks can be analysed to identify stable clusters as well as nodes with frequent cluster affiliation changes; these structural and behavioural properties can then be utilised for careful data and service placement and ferry selection. Factors...
Automated home care uses sensors to report about the well-being of monitored persons. Our complex event processing (CEP) system CommonSens simplifies the work of the application programmers, i.e., those who write the complex queries, by facilitating reuse of queries, sensor instances and environments. We have observed that many automated home care systems focus on detecting alarming behaviour, e.g...
The dynamic nature of mobile ad-hoc networks (MANETs) can easily lead to data being inaccessible due to constant route changes and network partitions. One method often used for increasing reliability and availability of data is replication. However, replication comes with costs, those of transferring and storing data and keeping track of consistency between replicas. For that reason, we have identified...
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 (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...
When developing a new autonomic networking architecture from scratch with monitoring as a first class citizen, a whole set of new requirements have to be addressed. The main reason for this is that no a priori knowledge about the network, the monitoring tasks, etc. is available in the architecture itself. Monitoring could be placed everywhere in the network and it must be possible for monitoring modules...
To increase the availability of mission critical services and information in sparse MANETs with frequent and/or long term network partitions, we aim to develop efficient replication and placement algorithms. The prediction of the neighborhood of a node is one core element in these algorithms. In this paper we present a neighborhood prediction algorithm based on the Sequential Monte Carlo framework,...
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...
In the ad-hoc info ware project, we develop a delay tolerant event notification service for sparse mobile ad-hoc networks for emergency and rescue operations. In most event notification solutions, subscriptions are formed with crisp values or crisp value ranges. Filtering mechanisms do not take into account more expressive subscriptions in terms of approximate predicates and complex aggregating relations...
We present in this paper an overview of current problems with the Internet from the architectural view point, and we identify and forecast trends for future developments. Our study includes perspectives from different stakeholders of the Internet as well as from the technological development point of view. We conclude that current and future requirements vary greatly between, and even within, different...
In emergency and rescue operations MANETs can help to increase the efficiency of the collaborative work. The goal is to increase the availability of services and information through resource awareness. The work described in this paper, presents our approach towards prediction of current and future resources available on remote devices. Our solution is based on information extracted from the node's...
In emergency and rescue operations MANETs can help to improve the efficiency of the collaborative work. The goal is to increase the availability of services and information through resource awareness. The work described in this paper, presents our approach towards prediction of current and future resources available on remote devices. Our resource prediction algorithm is based on information extracted...
Web Services technology is being used for increasingly different environments than it was designed for. To facilitate discovery of Web Services in dynamic environments, both service description and distribution of descriptions must be improved. Several research efforts target semantic description of services. However, Semantic Web Service discovery in peer-to-peer-like, dynamic environments where...
In the ad-hoc InfoWare project we investigate middleware solutions for mobile ad-hoc networks (MANETs) used in emergency and rescue situations. One goal in the project is to increase availability of services and information through resource awareness. In this context we regard the ability to predict with a certain confidence the future resource availability as very helpful. The work described in this...
Summary form only given. A new class of data-intensive applications, such as sensor networks, network traffic analysis, financial tickers, Web or telecommunications transaction log analysis, has become widely recognized. These applications require support for on-line analysis of rapidly changing data streams. However, traditional database management systems (DBMS) have no pre-defined notion of time...
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