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A theoretical study was conducted on finding optimal paths in transportation networks where link travel times were stochastic and time-dependent(STD). The methodology of relative robust optimization was applied as measures for comparing time-varying, random path travel times for a priori optimization. In accordance with the situation in real world, a stochastic consistent condition was provided for the STD networks and under this condition, a mathematical proof was given that the STD robust optimal path problem can be simplified into a minimum problem in specific time-dependent networks. A label setting algorithm was designed and tested to find travelers' robust optimal path in a sampled STD network with computation complexity of O(n2+n·m). The validity of the robust approach and the designed algorithm were confirmed in the computational tests. Compared with conventional probability approach, the proposed approach is simple and efficient, and also has a good application prospect in navigation system. 相似文献
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我公司篦冷机出料温度为65℃+环境温度,出料粒度25mm,锤式破碎机规格为Φ1230×2700,共18个锤头,环向分成4组,轴向每组锤头以4、5、4、5交错排列,锤头原固定方式见图1。图1锤头原固定方式自1995年运行以来,销轴经常发生从中间M10螺纹孔处断裂,平均每月3~5根,导致锤头脱落,锤平衡受到破坏。经过长期观察发现,销轴断裂经常发生在锤破中间靠左侧的14个锤头中,分析原因是熟料落入篦冷机后产生离析,大块熟料或窑垮圈时的大块窑皮落入篦冷机后均在左侧(回转窑顺时针旋转),必然加剧对左侧锤头的… 相似文献
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音乐是情感的艺术,家长应该如何去发掘和开发孩子的音乐潜能,这是一个长时间、循序渐进的过程。音乐能够表达人们的心灵感感受,又能激发人们的创造力。对于孩子来说,音乐能够促进智力发展,提高孩子对情感的感知力,起到陶冶情操,提高文化修养,并且对促进大脑发育,提高思维能力等有一定的作用。音乐还能激发孩子性格中的积极因素,克服性格中消极因素,让孩子变得勇敢、向上、有修养等。 相似文献
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