查询词典 metric topology

In order to solve the accumulation of synchronization error over hop distance in large scale wireless sensor networks, A new time synchronization algorithm has been proposed based on two-layer topology.

为了解决大规模无线传感器网络中同步误差随跳距的累积问题，提出一种基于二层拓扑结构的时间同步算法。

The main works of this paper are as follows.First, according to the three-step method, 1-D unsteady flow model in river network is introduced. A new topological structure is presented to describe and store the topology information and data in river network ,which realises the connection between GIS and the numerical program of hydraulic calculating and turns the program into a universal one .A new formula of internal boundary conditions with double-recursion algorithm is deduced, and the relationship of recursive coefficient between imaginary channel length and non-imaginary channel length is presented ,which makes sure that the model can comprise the numerical simulation of the internal boundaries such as side pipe outflow ,barrage, slice gate and drainage pump station.

主要工作如下：(1)根据三级解法建立了一维河网非恒定流模型，并提出了一种新的数据结构来描述和储存河网拓扑信息，方便了GIS平台和数值计算程序的衔接，实现了三级解法程序的通用性；从河段方程组出发，根据虚设河段法推导出了内边界条件的双追赶法公式，指明了虚设河段的追赶系数和非虚设河段追赶系数的关系，从而使模型可以模拟集中旁侧入流、堰、闸、水泵等内边界对行洪过程的影响。

A sensitivity analysis of adjoint method is presented to analyze the topology optimization problems. Meanwhile, the globally convergent version of the method of moving asymptotes is used in the optimization algorithm.

提出了适用于微型柔性机构多目标拓扑优化设计的伴随矩阵敏度分析方法，并将广义收敛移动渐进算法用于多目标多约束微型柔性机构拓扑优化问题的求解。

Study on topology of FC interconnections in future avionic system.

未来航电系统FC互连的拓扑结构研究。

Based on the summarizing of the algorithms of subdivision surface by Catmull and two-part texture mappings by Biers, this papers goes deeply into features of local texture mapping and the exiting problem, two kinds of local texture mapping methods are presented according to different topology surface.

本文在总结了Catmull的分割面片算法和Bier等的两步纹理映射算法基础上，深入研究了局部纹理映射的特点及目前存在的问题，提出了针对不同拓扑关系表面的两种局部纹理映射算法。

The circuit and topology of RS232C interface are analyzed to reveal the mechanism of multiple callings from terminals.

研究了RS232C协议接口电气特性和DCS系统网络的工作特性，分析了基于RS232C协议的并发呼叫帧发生碰撞的机理，并研究了由并发碰撞引起的帧错误类型。

In the thesis, research on network vulnerability analysis and IP traceback is discussed.Under the background of "IP network topology and analysis of performance based on network detection" supported by NSFC, Distributed Network Measurement and Analysis Infrastructure, the cooperant result of our workgroup, is discussed, and also the significance of network vulnerability analysis and IP traceback research in DNMAI; Several existing advanced vulnerability analysis methods and models are compared and summarized. Advantages and disadvantages of each technique are discussed in detail.

论文以国家自然科学基金重点项目(基于网络探测的IP网络拓扑发现和性能分析)工作组提出的分布式网络测量和分析基础架构为背景，在网络脆弱性分析和反向追踪方面做了一些研究工作：说明了脆弱性分析和反向追踪研究在DNMAI架构中的意义和作用；对现有网络脆弱性分析领域的几种先进模型和技术进行分析、比较和综述，详细讨论了各种技术的优缺点。

According to the calibration information, Research and development status of automotive bus network and automotive calibration system is studied and the research significance is generalized. First of all, the collectivity precept for calibration system is designed, the calibration platform is set up based on the XCP Protocol and the calibration object is CAN bus network simulation ECUs. Then how to create the calibration system based on Ethernet and Series communication is expatiated, the communication way from computer to ECUs is introduced and the calibration system is tested. Then how to create the calibration system based on CAN bus communication is expatiated, the design and the interface programme are introduced and the calibration system is tested. At last the platform is used to calibrate the CAN bus network simulation system to regulate the simulation system's topology and communication speed to test the communication protocol's feasibility.

论文首先设计了标定系统的总体方案，以CAN总线实时仿真系统中的节点标定为研究对象，采用XCP协议建立具有串口、以太网和CAN总线三种通讯接口的标定平台；然后，具体开发了基于以太网通讯和基于串口通讯的标定系统，完成了上、下位机部分的软件设计，确定了标定系统在两种通讯方式下的数据处理方法，并分别应用两种标定方式标定下位机仿真系统的参数，让下位机仿真系统在规定的通讯协议和拓扑结构下进行仿真，对所设计的标定系统进行了调试；接着，设计了基于CAN总线通讯的标定系统，完成了CCP协议（&XCP on CAN&）的接口程序设计，并通过混合动力汽车一种拓扑结构的通讯仿真对所设计的系统进行了调试；最后，应用开发的标定系统，对混合动力电动汽车网络通讯协议进行了仿真研究，并根据实验结果进行了分析。

Following a major shift of epochs, hydrogen began to appear spontaneously near the center of the spatial topology.

随着时代的大变迁，氢开始在靠近拓扑空间的中心自然出现。

Following a major shift of epochs, hydrogen began to appear spontaneously near the center of the spatial topology.

随着时代的大变迁，氢开始在*近拓扑空间的中心自然出现。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。