By Bernard Chazelle (auth.), Kyung-Yong Chwa, Oscar H. Ibarra (eds.)
This e-book constitutes the refereed complaints of the ninth overseas Symposium on Algorithms and Computation, ISAAC'98, held in Taejon, Korea, in December 1998.
The forty seven revised complete papers offered have been conscientiously reviewed and chosen from a complete of 102 submissions. The publication is split in topical sections on computational geometry, complexity, graph drawing, on-line algorithms and scheduling, CAD/CAM and photographs, graph algorithms, randomized algorithms, combinatorial difficulties, computational biology, approximation algorithms, and parallel and disbursed algorithms.
Read Online or Download Algorithms and Computation: 9th International Symposium, ISAAC’98 Taejon, Korea, December 14–16, 1998 Proceedings PDF
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Additional info for Algorithms and Computation: 9th International Symposium, ISAAC’98 Taejon, Korea, December 14–16, 1998 Proceedings
Sample text
We conclude that computing FVD(Ri ∪ Bj ) from FVD(Ri ∪ Bj+1 ) and FVD(Ri+1 ∪ Bj ) takes O(n2 (log n + log m)(|Ri | + |Bj |)) time. Summing this over all 0 ≤ i ≤ k, 0 ≤ j ≤ l gives k l O(n2 (log n + log m) (|Ri | + |Bj |)) (1) i=0 j=0 We have k k l |Bj | = O( i=0 j=0 k |B0 |) = O(k|B0 |) = O(m log m), (2) i=0 l and similarly i=0 j=0 (|Ri |) is O(m log m). It follows that the total time spent in all the iterations of the generic merge step is O(mn2 log m(log m + log n)). 3 The Basic Merge Step In the basic merge step, we compute FVD(Ri ∪ Bl ) for 0 ≤ i ≤ k, and FVD(Rk ∪ Bj ) for 0 ≤ j ≤ l.
The coordinates of the diagram sites are obtained by unfolding the triangles in the edge sequence to the pseudoroot so that they are all co-planar. The weight of a pseudoroot is the distance from the pseudoroot to the site s. It follows that the boundaries of regions in the SPM within a triangle consist of straight-line segments and/or hyperbolic arcs. For any point on a hyperbolic arc or a segment there are two shortest paths to s with different pseudoroots. Given two sites s and t on the polyhedron, the bisector β(s, t) is the set of all points on the polyhedron whose shortest path to s has length equal to the shortest path to t.
One gets Ω(kn) = Ω(mn) crossings for line , Ω(n) for each i . The pattern can be repeated on n lines parallel to and sufficiently close to . This gives Ω(mn) crossings for each of the n lines. The sites and the obstacles can be perturbed to a general position without affecting the lower bound complexity. By treating the lines as edges on a polyhedron, and ‘raising vertical cylinders’ with the obstacles as bases, we can get the Ω(mn2 ) bound for a polyhedron. Facility Location on Terrains 25 Using standard arguments, and the fact that FVD(S) has maximum total complexity O(mn2 ), we obtain the following.