Van-Quyet Nguyen

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We present a new technique to autonomous navigation based on ultrasonic sensors for mobile robots travelling through the narrow aisle that leave only a few centimeters on each side between the guides and the robot. In our current implementation the ultrasonic sensor system fires at a rate of 100 ms, that is, each of the 8 sensors fires once during each 100(More)
Regular path queries (RPQs) are widely used on a graph whose answer is a set of tuples of nodes connected by paths corresponding to a given regular expression. Traditional approaches for evaluating RPQs are restricted in the explosion of graph size and/or highly complex query (e.g., nested query). Consequently, evaluating an RPQ on a large graph often takes(More)
With the wide development of network services and the increasing network quality of service (QoS) requirements, dynamic network provisioning, which offers a smart way to segment the network to support particular services, becomes an important problem. Past studies of dynamic network provisioning mostly consider dynamic bandwidth and delay assignment in(More)
This paper present the theoretical development of a complete navigation problem of a non-holonomic mobile robot by using sonar sensors. To solve this problem, a new method to compute a fuzzy perception of the environment is presented, dealing with the uncertainties and imprecision from the sensory system and taking into account nonholonomic constraints of(More)
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