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91.
From a complex network perspective, this study sets out two aims around the US airport network (USAN) which is built from en-route location information of domestic flights in the US. First, we analyze the structural properties of the USAN with respect to its binary and weighted graphs, and second we explore the airport patterns, which have wide-ranging implications. Results from the two graphs indicate the following. (1) The USAN exhibits scale-free, small-world and disassortative mixing properties, which are consistent with the mainstream perspectives. Besides, we find (2) a remarkable power relationship between the structural measurements in the binary graph and the traffic measurements in the weighted counterpart, namely degree versus capacity and attraction versus volume. On the other hand, investigation of the airport patterns suggests (3) that all the airports can be classified into four categories based on multiple network metrics, which shows a complete typology of the airports. And it further indicates (4) that there is a subtle relationship between the airport traffic and the geographical constraints as well as the regional socioeconomic indicators. 相似文献
92.
针对高校快递智能柜选址问题,提出了重心法联合层次分析法的综合选址方法。该方法首先运用重心法确定智能快递柜的备选位置,再结合层次分析法从备选位置中确定最优选址。以广州某高校为例,对联合选址方法进行了实际应用。结果表明,该方法计算过程简便、实用,在校园自提柜选址决策方面有较高的科学性和可行性,可以为各大高校快递智能柜选址提供参考。 相似文献
93.
针对从Wi-Fi设备中获取的接收信号强度(RSSI)在定位过程中误差较大的问题,设计了一种基于信道状
态信息(CSI) 离散指纹的轨迹跟踪方法.首先经过汉佩尔滤波,巴特沃斯低通滤波去除了CSI异常值和噪声的影响,
然后利用线性回归算法去除相位的频移误差,继而采用协方差矩阵特征值法进行特征提取,最后通过基于CSI子
载波权重的主成分分析法进行了无源定位和轨迹跟踪.实验结果表明: 离散指纹点定位的平均正确率在 90%以上,
所设计的算法能有效实现对室内人员的定位和轨迹跟踪. 相似文献
94.
We develop a simple stock selection model to explain why active equity managers tend to underperform a benchmark index. We motivate our model with the empirical observation that the best performing stocks in a broad market index often perform much better than the other stocks in the index. Randomly selecting a subset of securities from the index may dramatically increase the chance of underperforming the index. The relative likelihood of underperformance by investors choosing active management likely is much more important than the loss those same investors take due to the higher fees of active management relative to passive index investing. Thus, active management may be even more challenging than previously believed, and the stakes for finding the best active managers may be larger than previously assumed. 相似文献
95.
There has been much research and speculation recently on the nature of radiation induced defects in zirconium and its alloys, and in particular on the absence of voids at high fluences and temperatures in the range 0.3 to 0.5 T m (T m is the absolute melting temperature). Wolfenden and Farrell1 have reviewed the evidence and suggest that α-Zr has so far resisted void formation during neutron irradiation because of: (a) the absence of a dislocation (loop or tangle) structure and/or (b) a low insoluble gas (e.g. helium) content. 相似文献
96.
本文简要介绍了势能面搜索的两个主要问题,即过渡态搜索和全局势能面搜索,并针对这两个问题介绍了本研究组最近发展的3种方法,即限制最小化双子算法、偏置势函数辅助限制性最小化双子算法以及势能面随机行走方法.这3种方法均只需计算一阶梯度,能够用于快速自动化的搜索过渡态以及势能面.通过几个典型例子分别说明了3种方法的特点及优势. 相似文献
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The passive film of iron showed n‐type semiconductor characteristic in borate buffer solution, and its donor concentration increased slightly after tensile strain in the present study. However, comparing with solution‐annealed sample, the anodic passive film formed on tensile‐strained one was highly protective. The more dislocations on tensile‐strained sample promoted the diffusion of iron and oxygen vacancy. Moreover, more donor density (mainly oxygen vacancies) promoted the diffusion of oxygen. They all facilitated tensile‐strained sample to form Fe2O3 and thicker passive film on the surface. More Fe2O3 and thicker passive film on the surface of tensile‐strained iron could improve corrosion resistance. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
100.
基于用户移动行为相似性聚类的Markov位置预测 总被引:1,自引:0,他引:1
由于采集点丢失或出现新用户等原因,GPS轨迹数据往往具有稀疏性,使得基于单个用户数据的位置预测准确率较低.针对这种情况,提出了基于移动行为相似性和用户聚类的Markov位置预测方法.首先,基于Voronoi图和原始GPS轨迹进行区域划分,位置预测基于区域轨迹进行;其次,提出了同时考虑用户转移特性和用户区域特性的移动行为相似性计算方法;再次,根据移动行为相似性对用户进行聚类,并在聚类的用户组上采用一阶Markov模型进行位置预测,提高了位置预测的准确性.真实GPS轨迹数据上的实验表明了所提出方法的有效性. 相似文献