Transport of skips between recycling centers and treatment facilities
研究了两种集装箱取送问题，建立数学模型并用变邻域搜索启发式算法求解，基于丹麦四个地区的真实数据验证了效果。
We study two versions of a skip pickup and delivery problem. In the first version, skips are picked up from recycling centers and, depending on their content, they are transported to specified treatment facilities where they are emptied before being returned to their origin. In the second version, the point of return of empty skips is flexible and determined by the skip type. We provide mathematical models for both versions of the problem and present a variable neighborhood search-inspired heuristic for solving them to near-optimality. Computational results are provided for real-life instances from four areas in Denmark.