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Utilization of an ultrasound tracking system in wireless sensor networks is a well-known technique with low-cost and high-accuracy advantages in an indoor environment. In this paper, we present the implementation of an active tracking system based on an ultrasonic sensing device using the IEEE 802.15.4 compatible radio. IEEE 802.15.4 is used in wireless(More)
An ultrasound tracking system is an inexpensive and accurate technique for indoor object tracking. In this paper, we describe an IEEE 802.15.4-based active tracking system that tracks multiple mobile objects effectively. We analyze the problems of the active tracking system with multiple objects and propose an adaptive beaconing algorithm as the solution.(More)
This paper presents a run-time monitoring framework to detect end-to-end timing constraint violations of event flows in distributed real-time systems. The framework analyzes every event on possible event flow paths and automatically inserts timing fault checks for run-time detection. When the framework detects a timing violation, it provides users with the(More)
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