Hidenori Ohta

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Pairwise key establishment is a fundamental service provided in secure sensor networks. However, due to resource constraints, establishing pairwise keys is not a trivial task. Recently, a random key pre-distribution scheme and its improvements have been proposed. The scheme proposed by Du et al. uses deployment knowledge to improve the performance and(More)
SUMMARY A 3D-dissection (A rectangular solid dissection) is a dis-section of a rectangular solid into smaller rectangular solids by planes. In this paper, we propose an O-sequence, a string of representing any 3D-dissection which is dissected by only non-crossing rectangular planes. We also present a necessary and sufficient condition for a given string to(More)
—The circle-packing problem is a problem of packing circles into a two dimensional area such that none of them overlap with each other. The authors have proposed SPC (Sequence-pair for circle packing), a method of representing relative location of circle pairs, which is an extended version of sequence-pair for rectangles. The authors have proposed also a(More)
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