Anti-collision algorithms are very important to solve the anti-collision problem in multi-tag and multi-reader environment. The anti-collision algorithm is divided into the anti-collision algorithm for multiple tags and the anti-collision algorithms for multiple readers. The anticollision algorithms for multiple tags are largely divided into tree-based deterministic algorithms and slot aloha-ba...

SUMMARY A T user multiple access collision channel without feedback is considered where the channel inputs are called packets. The packets take values from non-binary input alphabet. It is supposed that at most M users are active, i.e., are communicating simultaneously (2 ≤ M T). We are looking for codes and protocol sequences of users of minimum length such that from the output of the channel ...

Side-channel based collision attacks are a mostly disregarded alternative to DPA for analyzing unprotected implementations. The advent of strong countermeasures, such as masking, has made further research in collision attacks seemingly in vain. In this work, we show that the principles of collision attacks can be adapted to efficiently break some masked hardware implementation of the AES which ...

In the following article, the risk of a train suffering an accident by collision is analysed in conjunction with an unexpected obstacle on the track. This study is applied to high velocity railways, although this could be reflected towards any other lines. Various measures associated with the risk of accident, can be defined accordingly: the probability of being engaged in an accident, the time...

In multi-user communications the problem is how to serve many senders if one common communication channel is given. The classical solution is a kind of multiplexing, i.e., either time-division multiplexing, or frequency-division multiplexing. For partially active senders, always there are a large number of senders, each which has nothing to send most of the time. In this communication situation...

Collision of ships with oil tankers poses, next to grounding, one of the most serious environmental threats at sea. In many previous analyses of the collision problem, the bow of the impacting ship was considered rigid. The objective of the present research is to include the finite strength of the bow in the overall collision simulation. The emphasis will be placed on typical raked shapes becau...

Satellite collision avoidance analysis has received increased attention primarily due to the Iridium-COSMOS collision of February 2009, including consideration by the US Air Force of regular “all vs all” collision avoidance screening of the entire space catalog. Traditionally this type of analysis has been limited by computational resources. This analysis considers the accuracy and completeness...

In this paper we introduce the Distributed Energy-Aware Node Activation (DEANA) channel access protocol for powerconstrained networks. Conventional channel access protocols waste energy during periods of idle listening and collisions. In DEANA, the radio is switched to a low power, stand-by mode when a node is not transmitting or receiving which makes DEANA very attractive for sensor networks. ...

The theory of spatial Kerr solitons is extended to colliding beams that are neither almost-exactly copropagating nor almost-exactly counterpropagating. Our new Helmholtz formalism yields results that are consistent with the inherent symmetry of the collision process and that are not predicted by existing paraxial descriptions. Full numerical and approximate analytical results are presented. The...