We introduce a novel spatial join operator, the ring-constrained join (RCJ). Given two sets P and Q of spatial points, the result of RCJ consists of pairs p, q (where p P, q Q) ...
Localization is a fundamental issue of wireless sensor networks that has been extensively studied in the literature. The real-world experience from GreenOrbs, a sensor network sys...
Abstract. Energy consumption is a major factor that limits the performance of sensor applications. Sensor nodes have varying sampling rates since they face continuously changing en...
Context-aware middleware encompasses uniform ions and reliable services for common operations, supports for most of the tasks involved in dealing with context, and thus simplifyin...
Hung Quoc Ngo, Anjum Shehzad, Kim Anh Pham Ngoc, S...
Ubiquitous context-aware computing systems present several challenges in their construction. Principal among them is the tradeoff between easily providing new contextaware service...
William G. Griswold, Robert T. Boyer, Steven W. Br...