Jörg Nolte

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Radio transceivers for wireless sensor networks are typically cheap devices offering low bandwidth communication only. When physical events in the real world trigger spontaneous communication in many nodes the single communication channel is under heavy load and many messages are lost due to collisions. CSMA/CA schemes are well suited to spontaneous(More)
Unidirectional links are a common property of all wireless networks. In many cases, the range of these links exceeds that of bidirectional links by far. Still, most protocols ignore their existence or simply discard them. In this paper we introduce two new medium access control (MAC) protocols called MLMAC-UL and ECTS-MAC that are able to transmit data over(More)
Wireless sensor networks operate in an unstable environment and thus are subject to arbitrary transient faults. Self-stabilization is a promising technique to add tolerance against transient faults in a self-contained non-masking way. A core factor for the applicability of a given self-stabilizing algorithm is its convergence time. This paper analyses the(More)
In the near future, first responders such as firefighters might be supported by sensor nodes, both installed before the incident and placed by the responders themselves. To communicate with these sensor nodes, the first responders could be equipped with hand held devices, e.g. PDAs with wireless LAN, additionally equipped with a radio module of the same(More)
Event driven programming is widely used in sensor networks because of the high resource efficiency and the ease of synchronization in such systems. Also, the application logic itself can often be expressed naturally with an event handling system. However, handling of long running tasks is a severe problem, because most systems imply non-preemptive(More)
Massively parallel systems are based on distributed memory concepts and consist of several hundreds to thousands of nodes interconnected by a very high bandwidth network. Making these systems work requires a very careful operating system design. A distributed operating system is required that takes the form of a functionally dedicated server system. This(More)
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