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We present node-arc and arc-path formulations, and develop a branch-and-price approach for the directed network design problem with relays (DNDR). The DNDR problem can be used to model many network design problems in transportation, service, and telecommunication system, where relay points are necessary. The DNDR problem consists of introducing a subset of arcs and locating relays on a subset of nodes...
This paper considers the minimum-energy symmetric network connectivity problem (MESNC) in wireless sensor networks. The aim of the MESNC is to assign transmission power to each sensor node such that the resulting network, using only bidirectional links, is connected and the total energy consumption is minimized. We first present two new models of this problem and then propose new branch-and-cut algorithms...
Seamless steel tube, including multi-variety and multi-specification products, requires variously complicated operations in the whole production process, especially in the cold treating process (CTP). This paper takes the seamless tube plant of Baoshan Iron and Steel Complex as the research background. Considering the practical production constraints, CTP scheduling problem can be viewed as a hybrid...
Since the waste electrical and electronic equipment (WEEE) is increased rapidly, the disposition of WEEE has caused tremendous attention in China. The government is drafting regulation which will makes Original Equipment Manufacturers formally responsible for taking back their products. Logistics network design becomes vital for cost efficient managing WEEE in coming day. The aim of this paper is...
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