应急资源配送中Dijkstra改进算法的研究

路径规划问题是应急资源配送中的核心问题,最短路径算法在路径规划过程中起着决定性的作用,在众多路径规划算法中最经典且最具代表性的就是Dijkstra算法。以传统的Dijkstra算法分析为基础,从存储结构和算法过程两个方面进行一定程度的改进,目的是在节点数和边数较多的情况下,提高网络模型的处理效率。以真实道路交通数据为基础进行相关实验,结果证明,改进后的Dijkstra算法可以有效减少节点的计算量,提高算法的运行效率。     

货币账户带时滞的期权定价

在股票价格过程和货币市场账户均受时滞影响时,利用无风险对冲原理和鞅定价原理,得到了标准欧式期权的价格公式.研究表明,时滞对期权价格公式有明显的影响.     

井下车用零件多裂纹扩展的时变可靠性分析

针对工程中井下车用零件的多裂纹损伤问题，通过扭转疲劳试验模拟了车用零件中传动轴的疲劳损伤，并应用长焦显微镜与照相机相结合的测量法对零件一定疲劳循环次数后的表面裂纹进行了测量统计，同时以Paris模型及剩余强度估算模型对统计数据进行处理，得到了剩余强度.再应用所建立的时变可靠性数学模型，求取了零件时变强度的漂移率及波动率，并最终得出了该零件在一定疲劳循环后的可靠度.该方法从实际应用上解决了时变理论对零部件时变强度的动态检测问题，将时变理论向工程化应用推进一步，具有良好的应用前景.     

Benthic foraminiferal δ~(13)C minimum events in the southeastern Okhotsk Sea over the last 180 ka

A total of six d13C minimum events,i.e.,VI,V,IV,III,II,and I,were observed via a stable carbon and oxygen isotope analysis of infaunal benthic foraminifera Uvigerina spp.in gravity core OS03-1 in the southeastern Okhotsk Sea over the last 180 ka.These events occurred at112–109,102–90,85–76,57–54,44–40,and 17–10 ka BP.The largest negative excursions reached 2.5%in event V and were greater than 1%in the other events.We proposed that all d13C minimum events were caused by the increase in sea surface water productivity,the weakened formation of Okhotsk Sea intermediate water,and the enhancement of the oxygen minimum zone.The negative excursions were unaffected by methane hydrate destabilization and subsequent methane release based on the results obtained by using archaeal lipid markers.     

简易家用起坐器的研发

现代家用起坐产品缺乏并昂贵的现状,利用人因工程学知识,设计了简易家用起坐器,产品为床垫式结构,通过开关控制步进电机启停,从而实现起坐运动。产品经济实用,安全舒适,有很高的实用价值。     

Comparison of Achievable Rates of OFDM and Single Carrier Communication Systems

This paper presents a theoretical comparison of a single carrier system and a multi-carrier system through an analysis of the achievable rate under frequency selective fading with channel state information at the receiver. A scheme was designed to compare the achievable rates of a single carrier system and an Or-thogonal Frequency Division Multiplexing (OFDM) system. A thorough theoretical analysis of the two-path channel was conducted, and simulations were also used to analyze practical stochastic channels. Analysis and simulation results show that the achievable rates of the two approaches are comparable when the channel is flat fading. However, when the channel is frequency selective fading, the single carrier system outperforms the OFDM system. The achievable rate of the OFDM system is about 10% lower than that of the single carrier system at higher SNRs.     

Poisson方程各向异性一阶混合元格式

研究了Poisson方程在各向异性网格下的一阶混合元格式，在不引入传统投影算子的情况下，直接利用插值技巧得到了与以往文献相同的误差估计．     

基于神经网络技术自动筛选Monastrol抑制剂的算法研究

带自动荧光显微镜的HCS（high content screening）系统是一种新兴的显微摄影、筛选和处理系统.HCS系统在摄影过程中会产生大量数据,人工筛选和识别费时费力.本文为了进行Monastrol抑制剂的筛选,基于前馈式神经网络技术研究了一种对HCS系统摄影的大量细胞同时进行特征提取和细胞显型识别的自动算法.在得到各个通道分离的图像后,对不同通道图像进行并行预处理,并采用神经网络和逻辑运算相结合的算法进行处理.我们将该方法运用于Monastrol抑制剂的筛选中,并将结果与人工识别结果进行分析比较.相比较前人提出的multi-phenotypic mitotic analysis（MMA）算法自动识别的正确率得以提高,可更好评估抗癌药剂效用.     

广义V-I型多目标规划ε-有效解的充分性

利用对称梯度，定义了一类非光滑多目标规划的V-Is,ε型、拟V-Is,ε型和伪V-Is,ε型等几个广义向量，型不变凸性概念，得到了涉及这些新广义弘，型不变凸性的多目标规划的一些最优性充分条件。