Complex event processing (CEP) is an essential functionality for cross- reality environments. The DejaVu event processing system supports SmartRFLib, a cross-reality application that enables real-time event detection over RFID data streams feeding a virtual library on Second Life. event Processing s upport for Cross- r eality environments
Nihal Dindar, Katinka Kromwijk, Nesime Tatbul · 2009
ecent developments in sensor network technologies have paved the way for the widespread use of small, embedded sensing devices in many pervasive application domains. Such sensor networks help integrate physical reality into virtual computing plat-forms, letting us sense and react to real-world events in an automated fashion. Meanwhile, another class of Web-based computing plat-forms has recently emerged that enables virtual simulations of the real world over which people can interact online. Cross-reality environments could serve as a bridge across sensor networks and Web-based virtual worlds, improving people’s interac-tions with each other and the physical world. This capability could help many application areas achieve computational pervasiveness.Sensor networks generate data that often indicate certain complex phe-nomena in the real world. We can detect these phenomena only by applying higher-level infer -ence techniques to collected sensor data.