Because one of the strengths of NEH is its iterative neighborhood search policy,using the method of amplifying or simplifying neighborhod,several different space structures are given.

• 由于NEH算法取得成功的一个重要原因在于其迭代式插入邻域搜索过程,因此,着重从它的邻域搜索空间入手,用精简或增强邻域的方法,给出了几种不同的空间结构。