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On the performance of maximal intersection of spherical polygons by arcs

机译:弧形球形多边形最大交叉点的性能

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An important real-world optimization problem in manufacturing industry is to determine optimal workpiece setups for 4-axis NC machining. In this paper we reveal some interesting relations between this optimal workpiece setup problem and the two classic NP-hard problems in complexity theory (i.e, the vertex cover problem and the set cover problem). These relations immediately show the following results. First the optimal workpiece setup problem is NP-hard. Secondly, the greedy algorithm proposed in [Comput. Aided Des. 35 (2003) pp. 1269-1285] for the optimal workpiece setup problem has the performance ratio bounded by O(ln n-ln ln n+0.78), where n is the number of spherical polygons in the ground set.
机译:制造业中一个重要的真实优化问题是确定4轴NC加工的最佳工件设置。在本文中,我们揭示了这种最佳工件设置问题与复杂性理论中的两个经典的NP难题之间的一些有趣关系(即顶点覆盖问题和设定封面问题)。这些关系立即显示出以下结果。首先,最佳工件设置问题是NP-HARD。其次,[计算机中提出的贪婪算法。辅助des。 35(2003)PP。1269-1285]对于最佳工件设置问题,具有由O(LN N-LN LN N + 0.78)有界限的性能比,其中N是地面组中的球形多边形的数量。

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