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The ALICE High Level Trigger comprises a large computing cluster, dedicated interfaces and software applications. It allows on-line event reconstruction of the full data stream of the ALICE experiment at up to 25 GByte/s. The commissioning campaign has passed an important phase since the startup of the Large Hadron Collider in Nov 2009. The system has been transferred into continuous operation with...
The on-line event reconstruction in ALICE is performed by the High Level Trigger, which should process up to 2000 events per second in proton-proton collisions and up to 200 central events per second in heavy-ion collisions, corresponding to an input data stream of 30 GB/s. In order to fulfil the time requirements, a fast on-line tracker has been developed which can optionally use GPU hardware accelerators...
Interference ranges can dramatically affect the throughput in wireless sensor networks. While the transmission range defines the maximum physical range of a radio signal the interference range determines the area in which other nodes will be prevented from successful receiving or transmitting signals. In this paper we present an initial self organizing routing protocol for wireless sensor networks,...
We discuss impacts of the prediction search space size on accuracy and robustness of context prediction approaches. Additionally, the impact on error detection and correction capabilities are considered. Conclusions are experimentally verified in a realistic ubiquitous setting.
We propose an audio-based mechanism for device authentication. The method is feasible with low-end microphones and can be extended to further UbiComp application domains as improved location estimation of sensor nodes or alarming. Measurement results obtained in a preparatory study demonstrate the performance of the approach.
In sensor networks different types of sensors are used to capture events, recognize contexts, derive states of objects or monitor processes within application scenarios. We envision the use of the presented technology in areas that are very complex, e.g. in industrial applications. The presented system uses sensor information from wireless sensor nodes that are forwarded and aggregated in an information...
We present a system that helps energy suppliers to smoothen the total peak load by generating price incentives for consumers. Consumers in turn get fine grained cost sensitive control of energy consumption of the past, present and future with a precise real-time overview of all devices in their household, company or industry. Pricing information of the energy provider and external sources is processed...
This paper presents concept and first implementation of a sensor system blackboard concept (S2B2). S2B2 is designed as a data store surrounded by software modules that operate on the blackboard. The blackboard is implemented as the only communication medium between modules within the sensor node. Modules can also transparently communicate with other modules even if they are hosted on a remote, different...
This demonstration shows how to geocode information originated from sensor networks. Geocoding is a technique to graphically represent information in a "map to be seen" (Bertin 1967). The demonstration presents: 1.) a toolset to overlay sensor network information including sensor and context data, with geographic maps; 2.) a sensor network, transformation of sensor network information, technology...
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