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The Euclidean Steiner minimum tree problem is a classical NP-hard combinatorial optimization problem. Because of the intrinsic
characteristic of the hard computability, this problem cannot be solved accurately by efficient algorithms up to now. Due
to the extensive applications in real world, it is quite important to find some heuristics for it. The stochastic diffusion
search algorithm is a newly population-based algorithm whose operating mechanism is quite different from ordinary intelligent
algorithms, so this algorithm has its own advantage in solving some optimization problems. This paper has carefully studied
the stochastic diffusion search algorithm and designed a cellular automata stochastic diffusion search algorithm for the Euclidean
Steiner minimum tree problem which has low time complexity. Practical results show that the proposed algorithm can find approving
results in short time even for the large scale size, while exact algorithms need to cost several hours. 相似文献
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公路桥梁板式橡胶支座比其他橡胶支座更容易受到酸雨的影响,为了研究不同腐蚀时间下公路桥梁板式氯丁橡胶支座经过酸腐蚀后的各项力学性能变化,采用3.0%的硫酸溶液对公路桥梁氯丁橡胶支座分别进行20,40,60和80 d的酸腐蚀处理,并采用5000 kN压力试验机进行轴心受压试验研究.分别对其表观、外形尺寸、极限抗压强度、竖向刚度和抗压弹性模量等进行对比分析.结果表明腐蚀时间越长,公路桥梁板式氯丁橡胶支座更容易发生脆性破坏,其极限抗压强度、竖向刚度和抗压弹性模量等指标显著降低.通过承载力衰减规律对比分析,采用最小二乘法建立公路桥梁板式氯丁橡胶支座的极限抗压强度的衰减模型.当腐蚀到一定程度,极限抗压强度、竖向刚度和抗压弹性模量等已无法满足实际工程要求,建议在实际工程中要避免氯丁橡胶支座受到酸腐蚀的破坏. 相似文献
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高等级公路植物防护篱的营造与管理 总被引:2,自引:0,他引:2
高等级公路的防护篱以植物防护好于工程防护,植物防护应根据不同地区采用不同的树种。根据陕西省高速公路的具体情况,确定出短途陕西高等级公路防护篱的设计,营造和管理技术。 相似文献
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