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We consider odor-plume tracing using a multi-robot system in indoor natural airflow environments. The purpose of odor-plume tracing is to approach the odor source via following the found plume with mobile robot(s). Owing to the chaotic nature of the odor transport in the atmosphere, tracing the resultant patchy meandering plume down to its source is thus not a trivial task. A novel multi-robot based...
An approximate algorithm, which is used to solve distance calculation problem in overlapped frequency division multiplexing (OVFDM) communication system, is presented in this paper. The distance calculation problem in OVFDM system is a {-2, 0, 2} combinatorial optimization problem. It is NP-hard. Our approximate algorithm for this problem uses the semi-definite relaxation method and rounding technique...
Big progress has been made in the area of using DNA computing to solve NP problems and NP-hard problems. However, research on arithmetic almost made no progress. Just for this reason, a three-segment coding scheme of real number was proposed; and a DNA addition model based on this coding scheme was proposed, too. This model solved the carry and borrow problem in computing with DNA strands. The addends...
A fast decoding algorithm based on Semidefinite relaxation combined with cutting plane is proposed for the detection of Non-orthogonal frequency division multiplexing (NFDM) signals. It shows that maximum likelihood (ML) detection of NFDM signals can be transformed into a semidefinite programming problem by relaxing rank one constraint. In order to tighten the performance gap between the relaxed combinatorial...
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