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BACKGROUND Light exposure can cascade numerous effects on the human circadian process via the non-imaging forming system, whose spectral relevance is highest in the short-wavelength range. Here we investigated if commercially available compact fluorescent lamps with different colour temperatures can impact on alertness and cognitive performance. METHODS(More)
Recently, we showed that for traditional bidirec-tional search with "front-to-end" evaluations, it is not the meeting of search fronts but the cost of proving the optimality of a solution that is problematic. Using our improved understanding of the problem, we developed a new approach to improving this kind of search: switching to unidirectional search(More)
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