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On bends and distances of paths among obstacles in two-layer interconnection model

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3 Author(s)
Lee, D.T. ; Dept. of Electr. Eng. & Comput. Sci., Northwestern Univ., Evanston, IL, USA ; Yang, C.D. ; Wong, C.K.

We consider problems of finding assorted rectilinear paths among rectilinear obstacles in a two-layer interconnection model according to the number of bends and the 1-layer distance (y-distance). Using a horizontal wave-front approach, optimal θ(e log e) time algorithms are presented to find the shortest path and the minimum-bend path using linear space, and to find the shortest minimum-bend path and the minimum-bend shortest path using O(e log e) space, where e is the number of obstacle edges. By the same approach, we also derive an algorithm for finding a shortest two-layer distance (xy-distance) minimum-bend path in optimal θ(e log e) time using O(e log e) space

Published in:

Computers, IEEE Transactions on  (Volume:43 ,  Issue: 6 )

Date of Publication:

Jun 1994

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