The eavesdropping attack is a serious security threat to a wireless sensor network (WSN) since the eavesdropping attack is a prerequisite for other attacks. Conventional WSNs consist of wireless nodes equipped with omnidirectional antennas, which broadcast radio signals in all directions and are consequently prone to the eavesdropping attacks. Different from omnidirectional antennas, directiona...

Broadcast has been widely used in mobile ad hoc networks (MANETs) as a communication means to disseminate information to all reachable nodes. However, the conventional broadcast scheme that broadcast packets omni directionally suffers from several drawbacks: excessive amount of redundant traffic, exaggerated interference/contention among neighboring nodes, and limited coverage (as a result of c...

This paper presents an evaluation of two orthogonal schemes for improving the efficiency of solving constraint satisfaction problems (CSPs). The first scheme involves a class of pre-processing techniques designed to make the representation of the CSP more explicit, including directional-arcconsistency, directional-path-consistency and adaptive-consistency. The second scheme aims at improving th...

Based on time-dependent travel times for N past days, we consider the computation of robust routes according to the min-max relative regret criterion. For this method we seek a path minimizing its maximum weight in any one of the N days, normalized by the weight of an optimum for the respective day. In order to speed-up this computationally demanding approach, we observe that its output belongs...

Searches for WIMP dark matter will in the near future be sensitive to solar neutrinos. Directional detection offers a method reject neutrinos and improve searches, but reaching that sensitivity with existing directional detectors poses challenges. We propose combined atomic/particle physics approach using large-volume diamond detector. candidate events trigger particle detector, after which spe...

Ordered sets are used as a computational model for motion planning problems. Every ordered set has a two-directional point representation using subdivisions. These subdivision points correspond to direction changes along the path of motion. AMS subject classifications (1980). 06A10, 52A37, 68E10.

Electron microscopy of DNA gyrase holoenzyme, of gyrase A subunits, and of the complexes of both species with DNA enables us to deduce the relative locations of subunits in the holoenzyme and to indicate a plausible path for DNA complexed with gyrase. The structural results are discussed in terms of certain models for directional DNA strand transport.

We report the first atomistic determination of the minimum energy path for a series of bond ruptures to advance a crack front. Saddle-point configurations on (111) cleavage planes in Si reveal a steplike distribution of atomic displacements, implying a kink mechanism which is known to control dislocation mobility. Manifestations of lattice trapping and directional cleavage anisotropy are furthe...

In this paper, control algorithms are presented for formation keeping and path following for non-holonomic platforms. The controls are based on feedback from onboard directional range sensors, and a switching Kalman filter is introduced for active sensing. Stability is analyzed theoretically and robustness is demonstrated in experiments and simulations.

In this paper, control algorithms are presented for formation keeping and path following for non-holonomic platforms. The controls are based on feedback from onboard directional range sensors, and a switching Kalman filter is introduced for active sensing. Stability is analyzed theoretically and robustness is demonstrated in experiments and simulations.