The paper demonstrates a following robot with omni-directional wheels, which is able to take action to avoid obstacles. The robot design is based on both fuzzy and extension theory. Fuzzy theory was applied to tune the PMW signal of the motor revolution, and correct path deviation issues encountered when the robot is moving. Extension theory was used to build a robot obstacle-avoidance model. V...

Naval at sea (maritime tactical) networks are characterised by a dynamic, heterogeneous, and low-bandwidth environment. There is a critical need for Traffic Engineering (TE) mechanisms to support traffic prioritisation and resource optimisation in this environment. A desirable management service in this environment is end-to-end guaranteed bandwidth for critical application flows. Solutions suc...

Multiple disjointed paths have been demonstrated to be effective in delivering multimedia traffic in wireless sensor networks, and improving the network performance in terms of bandwidth aggregation, reliability and network lifetime. In this paper, we investigate the use of directional geographical routing for multipath construction for multimedia data dissemination, and identify the challengin...

Inside tunnels, the possibility of over-reach of radiated power from the Dedicated Short Range Communications (DSRC) service zone to the out-of-service zone is high, since the waves are confined in the tunnel space. To inspect this more carefully, wideband directional channel measurements were conducted inside an arched transportation tunnel, and the gain, angle-of-arrival and delay of each pro...

XML query languages use directional path expressions to locate data in an XML data collection. They are tightly coupled to the structure of a data collection, and can fail when evaluated on the same data in a different structure. This paper extends XPath expressions with a new structure-independent, nondirectional axis called the neighborhood axis. Given a pair of context nodes, the neighborhoo...

This paper presents results from the (to our knowledge) first dynamic double-directionally resolved measurement campaign at mm-wave frequencies for an outdoor microcellular scenario. The measurements are performed with USC’s realtime channel sounder equipped with phased array antennas that can steer beams electrically in microseconds, allowing directional measurements in dynamic environments. E...

In this paper, design of an autonomous microrobotic endoscopy system is presented. The proposed microrobotic endoscope is a vision-guided device, developed to facilitate navigation inside a human colon. The design of the entire system is divided into three areas viz. design of a microrobotic carrier, path planning and guidance, and an off-board control system. A microrobotic design based on pne...

The complexities of various search algorithms are considered in terms of time, space, and cost of solution path. I t is known that breadth-first search requires too much space and depth-first search can use too much time and doesn't always find a cheapest path. A depth-first iteratiw-deepening algorithm is shown to be asymptotically optimal along all three dimensions for exponential pee searche...

Abstract Wireless connectivity has been realized for multiple environments and different frequency bands. However, little research exists about mmWave communication in industrial environments. This paper presents the 60 GHz double-directional radio channel a ship hull Line-of-Sight (LOS) non-Line-of-Sight (NLOS) conditions. We performed measurements using Terragraph sounder at locations fitted ...

ZigBee provides a simple and reliable solution for the low-cost networks. The ZigBee ad hoc on-demand distance vector (Z-AODV) could use the global shortest path for data transmission by flooding the routing quest when necessary. However, the current routing algorithms cannot fully address the energy consumption issue. In this paper, we propose a directional broadcasting algorithm in routing di...