北京市市内摩托车将禁限行

近日,从北京市交管局官方网站获悉,北京市内二、三、四、五环主路,全天禁止摩托车通行,四环路(不含辅路)以内道路,禁止京B号牌摩托车和外省市摩托车行驶;长安街(新兴桥至国贸桥),7时～20时,禁止摩托车通行;二、三、四、五环主路,全天禁止摩托车通行;     

一种通过粒径替换预测碎石土抗剪强度的方法研究

公路弃渣场碎石土难以通过试验获取抗剪强度,利用平行替换和整体缩小粒径的方法,重制试样,开展直剪试验,并将试验结果与原始碎石土试样的抗剪强度参数进行对比,分析仅利用小试样预测碎石土抗剪强度的可行性.研究表明:当粒径平行替换后重制土试样细粒含量较小时,对重制土进行直剪试验即可较好地预测出原始碎石土的抗剪强度;当粒径平行替换...     

A Dynamic Job Scheduling Algorithm for Parallel System

One of the fundamental problems in parallel and distributed systems is deciding how to allocate jobs to processors. The goals of job scheduling in a parallel environment are to minimize the parallel execution time of a job and try to balance the user‘s desire with the system‘s desire. The users always want their jobs be completed as quickly as possible, while the system wants to service as many jobs as possible. In this paper, a dynamic job-scheduling algorithm was introduced. This algorithm tries to utilize the information of a practical system to allo-cate the jobs more evenly. The communication time between the processor and scheduler is overlapped with the computation time of the processor. So the communication overhead can he little. The principle of scheduling the job is based on the desirability of each processor. The scheduler would not allocate a new job to a processor that is already fully utilized. The execution efficiency of the system will he increased. This algorithm also can he reused in other complex algorithms.     

由平行切片图象重建血管的三维模型

CT图象可用于了解生物的组织结构，若摄取样木的数十，成百个平行切片，依次逐步分析并采样得到的各平行切片的CT图象，运用计算机就可重建其组织结构的准确的三维模型，本文提出了用数字矩阵表示CT图象的方法，定义了图象数字矩阵的“交、差、并、抽壳”的运算规则，并运用这些运算规则对血管切片的CT图象进行处理，求出血管中轴线与各平行切片的交点及血管的直径，运用OLE自动化技术控制AutoCAD实现血管三维图的重建。     

双曲柄环板式针摆行星传动中平行四杆机构运动性能分析

针对双曲柄环板式针摆行星传动中的平行四杆机构，运用动力学原理分析了杆长尺寸随机误差对机构中铰链支反力的影响，并建立了力分析模型，为在设计双曲柄环板式针摆行星传动时更好地计算各构件的强度、运动可靠性等提供了一定的理论基础．     

NEURAL NETWORK TRAINING WITH PARALLEL PARTICLE SWARM OPTIMIZER

Feed forward neural net works such as multi-layer perceptron,radial basis function neural net-works,have been widely applied to classification,function approxi mation and data mining.Evolu-tionary computation has been explored to train neu-ral net works as a very promising and competitive al-ternative learning method,because it has potentialto produce global mini mum in the weight space.Recently,an emerging evolutionary computationtechnique,Particle Swar m Opti mization(PSO)be-comes a hot to…     

Identification of Dynamic Parameters Based on Pseudo-Parallel Ant Colony Optimization Algorithm

IntroductionReal ants are capable of finding the shortest pathfrom a food source to the nest. Inspired by this factand the behavior of ant colonies, a novel optimizationalgorithm called ant system (AS) was first developedby Dorigo in1992[1]. In the following years, diversemodifications of the AS algorithm were made andapplied to many different types of optimization prob-lems, and satisfactory results were obtained. Re-cently, the AS algorithm has been extended to an al-gorithm for solving d…     

“一带一路”倡议与经济治理现代化

从经济的视角理解“一带一路”倡议,主要有以下三种观点。第一种观点认为中国倡导“一带一路”旨在形成一种与现有的以“华盛顿共识”为纲领、布雷顿森林机构为依托的国际经济秩序彼此平行甚至相互竞争的新经济秩序。第二种观点认为中国推动“一带一路”主要是为国内富余产能寻找出路,帮助国内经济结构转型和产业升级。第三种观点认为“一带一路”倡议主要是中国在新的历史条件下进一步发展开放型经济的举措。     

基于新型迎宾灯的原理分析与设计研究

迎宾灯又称为照地灯,起初安装于车门底部。当打开车门时,位于车门底部的迎宾灯自动点亮,照亮车门旁边的区域。这种设计使驾驶员在光线不足的情况下,上下车时更加方便[1]。然而,因车门底部容易进水,这往往会影响车门迎宾灯的正常使用,缩短其使用寿命。据此,一些车辆直接将车门迎宾灯安装于后视镜底部。