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Data centers often hold tens to hundreds of thousands of servers in order to offer cloud computing services at scale. Ethernet switching and IP routing have their own advantages and limitations in building data center networks. Recent research, such as PortLand and BCube, has proposed scalable data center network designs. A common feature of these designs is that their addressing and routing are customized...
Minimal Steiner tree problem on graphs is a traditional optimization problem, which has wide- spread use in different application areas. Greedy heuristics for all the people to use the problem are using the shortest path heuristic, and various variants are also used. In this paper, a new heuristic for solving STPG is proposed. The new heuristic defined a novel neighborhood for local search methods...
The minimum Steiner tree problem, a classical combinatorial optimization problem with a long history, is a NP-complete problem. Due to its wide application, study of heuristic algorithm about Steiner tree problem has important practical and theoretical significance. In this paper, based on the MPH algorithm, give non-multicast nodes weights and calculate their average weight for the path through non-multicast...
Considering that travel routing costs change with time against the background of reverse logistics, this paper presents the time dependent vehicle routing problem of simultaneous delivery and pick-up (TD-VRPSDP), and establishes the mixed integer programming model of TD-VRPSDP. The pheromone updating strategy based on rank-based ant colony system and max-min ant system algorithm are used for solving...
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