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The Internet of Things aims to connect networked information systems and real-world business processes. Technologies, such as bar-codes, radio transponders (RFID) and wireless sensor networks, which are directly attached to physical items and assets transform objects into Smart Items. These Smart Items deliver the data to realize the accurate real-time(More)
Many pervasive applications deal with relative positions between interacting entities rather than global coordinates. The Relate project developed sensing methods and a modular system architecture for peer-to-peer relative positioning. It studied the methods and architecture in application case studies on mobile spatial interaction, firefighter navigation,(More)
— Massively deployed wireless sensor and actuator networks (WSAN), co-existing with RFID technology, can bring clear benefits to large-scale enterprise systems, by delegating parts of the business functionality closer to the point of action. However, a major impediment in the integration process is represented by the variety of customized WSAN platforms and(More)
— Wireless sensor networks are used to perform sensor measurements under a variety of conditions. In settings with sparse distribution of sensor nodes, multi-hop routing is traditionally used to forward information from a source node to a destination node. A problem with this approach is that loss of connectivity of nodes in the path between source and(More)
Many industrial applications rely on sensors and sensor networks residing on machinery, transport containers or in the environment. For distributed processes in such domains the sharing of those sensor networks is crucial. This paper introduces a peer-to-peer (P2P) architecture for sharing services provided by existing sensor networks with any Internet(More)
This paper presents the µPart wireless sensor system especially designed for settings requiring a high population of sensors. Those settings can be found in actual research of indoor activity recognition and ambient intelligence as well as outdoor environmental monitoring. µParts are very small sensor nodes (10x10mm), with wireless communication, enabling(More)
Many ubicomp appliances require the recognition of context. Existing context systems do not provide information about the quality of the context recognized to the appliance at runtime. In this paper we propose the first context quality system which gives quantitative measures, the context quality measure (CQM), in real time. The CQM can be used by(More)
— This paper analyses the problem of time-synchronization of distributed sensor nodes. We present a Syncob, a method for synchronizing an arbitrary number of nodes in a distributed setting without the requirements of an infrastructure, master node or time and resource consuming protocol overhead. Syncob is therefore also very good suited for highly mobile(More)
Wireless Sensing and Radio Identification systems have undergone many innovations during the past years. This has led to short product lifetimes for both software and hardware compared to classical industries. However, especially industries dealing with long-term support of products, e.g. of industrial machinery, and product lifetime of 40+ years may(More)