| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
We studied a recently proposed variant of vehicle routing problems which takes the customers’ regrets as the objective function. We developed algorithms for the problem using structures of input graphs, and also proved some computational hardness and inapproximability. In addition, we introduced some generalized variant, and examined an extension of our algorithms in order to put our developed methods in place. Our approximation method for trees is best possible from the viewpoint of approximation ratio, because one can choose an arbitrarily better ratio.
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