在道路网络中寻找多个新的最优位置
Finding Multiple New Optimal Locations in a Road Network
摘要:
我们研究了道路网络中基于位置的服务的最佳位置查询问题,旨在为新服务器或设施找到位置。现有的最优解只考虑了一个新服务器的情况。当两个或多个新服务器被设置时,最小最大成本准则MinMax的问题变成NP难的。在这项工作中,我们确定了一些有用的属性的潜在位置的新服务器,从中我们得到一个新的算法MinMax,并表明,它是有效的,当新服务器的数量是小的。当新服务器的数量是大的,我们提出了一个有效的3-近似算法。在真实道路网络上进行的实验表明,与现有的贪心算法相比,我们的解决方案是有效的,并且获得了更好的结果质量。
英文摘要:
We study the problem of optimal location querying for location based services in road networks, which aims to find locations for new servers or facilities. The existing optimal solutions on this problem consider only the cases with one new server. When two or more new servers are to be set up, the problem with minmax cost criteria, MinMax, becomes NP-hard. In this work we identify some useful properties about the potential locations for the new servers, from which we derive a novel algorithm for MinMax, and show that it is efficient when the number of new servers is small. When the number of new servers is large, we propose an efficient 3-approximate algorithm. We verify with experiments on real road networks that our solutions are effective and attains significantly better result quality compared to the existing greedy algorithms.
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