算法的经验分析

我们以前应用过许多算法分析,虽然这些技术能够成功应用于许多简单的算法,但即使有许多高级技术的支持,数学也远不是万能的。实际上我们能够证明,即使许多貌似简单的算法也是很难用数学的精确性和严格性来分析的。除了可以对算法的效率做数学分析以外,另一种主要的方法是对算法的效率做经验分析。     

服务器负载均衡的应用与实现

讨论了服务器的性能问题，介绍了多台服务器负载均衡的概念和重要性，并详细阐述了多台服务器负载均衡的原理。以一个呼叫中心案例为例描述了多台服务器实现负载均衡的方法。通过多台服务器的负载均衡，提高了应用系统的性能及容错能力，增强了应用系统的稳定性和可靠性。     

网上城市通用系统架构总体设计与实现

针对目前城市信息化建设过程中存在着大量的信息资源利用率低、多种遗留系统需要被广泛地集成、业务流程需要不断改进从而满足政务发展的实际需求等诸多问题，提出和设计了网上城市通用系统架构模型，围绕该模型，介绍了不同平台的典型使用场景和实现技术。     

一种发布订阅中间件的设计

设计一种基于主题发布订阅机制的中间件。发布/订阅机制能够提供一对多和多对多的异步通信模式,能使通信的各个参与者在时间和空间上完全解耦,能很好地满足大规模分布式系统松耦合通信的需求。对该中间件的网络数据传输延迟作测试。     

组播技术综述

组播通信技术提供了一种点对点或多点对多点的数据传输模型 ,作为下一代 Internet应用的重要技术 ,组播相关技术研究引起了广泛关注 .本文从分布式系统特点出发 ,分析了组播研究的内容和特点 ,描述了组播设计所涉及的技术及难点 ,概括了现有工作和相关进展     

一种优化控制器参数的方法

1IntroductionTo a designed feedback control system,should givefull play to its fine control performance,must also adjustthe parameters of the controller carefully,this is a vastautomatic engineer's question often faced of instrumenttoo.With the development of intellectual control andtechnology of the instrument,some intellectual controllerand self-correct controller are already used for processcontrol.This kind of instrument is operated simply,needn't adjust the parameter,and bring very great …     

日本高校机器人学科建设经验

在机器人学科建设方面,日本高校较早建立了成熟的培养理念,并制定了合理完善的课程体系。比较分析了日本多所高校机器人专业的课程设置内容及特点,并总结了课程设置和相关应用领域的关系,可供我们在学科建设中借鉴。     

Fuzzy multi-criteria evaluation of industrial robotic systems

Industrial robots have been increasingly used by many manufacturing firms in different industries. While the number of robot manufacturers is also increasing with many alternative ranges of robots, potential end-users are faced with many options in both technical and economical factors in the evaluation of the industrial robotic systems. Industrial robotic system selection is a complex problem which many qualitative attributes must be considered. These kinds of attributes make the evaluation process hard and vague. Hierarchical structure is a good approach to describe a complicated system. This paper proposes a fuzzy hierarchical TOPSIS model for the multi-criteria evaluation of the industrial robotic systems. An application is presented with some sensitivity analyses by changing the critical parameters.     

Structure-adaptive parallel solution of sparse triangular linear systems

Solving sparse triangular systems of linear equations is a performance bottleneck in many methods for solving more general sparse systems. Both for direct methods and for many iterative preconditioners, it is used to solve the system or improve an approximate solution, often across many iterations. Solving triangular systems is notoriously resistant to parallelism, however, and existing parallel linear algebra packages appear to be ineffective in exploiting significant parallelism for this problem.     

有理多结点样条插值曲线及曲面

鉴于多结点样条曲线（MSIC）是一种点点通过的插值样条曲线,因此在多结点样条插值曲线研究的基础上,给出了有理多结点条插值曲线和有理多结点样条插值曲面的定义,并讨论了有理多结点样条的性质,对有理多结 样条曲线和有理多结点样条曲面的光滑拼接问题进行了讨论,此外,还对有理多结点样条在计算机辅助几何设计中的若干应用问题进行了说明。     

大量类别下非纹理对象实时检测与识别

现有的对象检测方法主要针对特定对象,当类别比较多时,难以实现实时检测与识别。提出了一种基于Objectness和梯度方向模板的大量类别下非纹理对象的实时检测与识别算法。该方法首先通过计算图像Objectness值来评价待测图像中可能出现对象的区域,大量减少可能匹配的窗口。在此基础上,在可能出现对象的区域,采用基于模板主方向和查找表的模板匹配方法,实现大量类别下非纹理对象的实时检测与识别。该方法对非纹理物体的鲁棒性较好,同时在匹配的过程中也是方向无关的。     

FPGA在多路数据采集系统中的应用研究

数据采集系统在测量、控制、信息处理等多学科领域有着广泛的应用,传统的以单片机为核心的多路数据采集系统原理简单、技术成熟、选型方便,但也存在的外围芯片多、电路复杂、不易升级与改进等缺点;鉴于此,提出了一种以FPGA为逻辑控制核心的多路数据采集系统设计方案,重点介绍了关键器件的选择、FPGA功能模块设计、FPGA外围电路设计;并结合部队实际需求,成功地将这一方案应用到武器装备测试系统的研制过程中,体现了较高的军事及经济价值。     

计算平面点集凸壳的两种新方法

平面上有限点集的凸壳在土木工程及其它许多领域均有很多重要应用,计算几何中的很多应用问题都与凸壳有关.现有多种求平面上点集凸壳的方法,但这些方法要么算法非常复杂,要么编码及实现非常困难.介绍了两种求平面点集凸壳的新方法,它们具有算法思想简单且易于编码实现的优点.     

在Delphi中巧用控件的Canvas属性

CANVAS又称画布，在Delphi中很多控件都在Canvas属性，通过它可以很方便地完成许多图形图像等功能，本文列举了几个控件，说明了其画布属性的应用。     

Analysis of effective vibration frequency of cable-driven parallel robot using mode tracking and quasi-static method

Microsystem Technologies - Recently, cable-driven parallel robots (CDPRs) have been used in many industry applications because of many advantages such as large workspace, high moving sensitivity...     

网上城市业务流程的研究与实现

针对目前城市信息化建设过程中业务流程需要不断改进，从而才能满足政务发展的实际需求等诸多问题，该文就网上城市业务流程进行了探讨，并介绍了典型应用。     

UNIX环境下的多进程编程

由于UNIX系统是分时多用户系统,实质上应该说CPU按时间片分配给各个进程使用,每个进程都有自己的运行环境以使得在CPU做进程切换时不会"忘记"该进程已计算了一半的"半成品",进程的切换都是一次中断处理过程,UNIX系统本身是用C语言编写的多进程程序,多进程编程是UNIX的特点,我们尽可以使用系统提供的多进程的特点,让几个程序并行执行,提高系统的并行处理能力,简单而又高效地完成相应任务。本文主要介绍在UNIX系统下多进程编程的有关系统调用和编程技巧。     

一种新的分形树递归算法的研究

树木种类繁多,形态各异,在虚拟场景建模中具有广泛的应用,分形递归算法能够比较简单快捷的建立起分形树模型,但现有的分形树递归算法缺乏通用性,针对不同分枝形态的分形树需要建立不同的算法模型。本文对递归算法进行了改进,通过每次产生不同的随机数控制生成多种分枝形态各异的分形树。实验结果表明,该算法具有很好通用性,高效简洁,能生成形态更加丰富自然的分形树。     

Sparse Hard Sets for P: Resolution of a Conjecture of Hartmanis

Building on a recent breakthrough by Ogihara, we resolve a conjecture made by Hartmanis in 1978 regarding the (non)existence of sparse sets complete for P under logspace many–one reductions. We show that if there exists a sparse hard set for P under logspace many–one reductions, then P=LOGSPACE. We further prove that if P has a sparse hard set under many–one reductions computable in NC¹, then P collapses to NC¹.     

Development of a flexible autonomous robot without sensors or controllers

Recently, various robots with many degrees of freedom, such as rescue robots and domestic robots, have been developed and used in practical applications. It is difficult to control such robots autonomously in real environments, because in order to control the many degrees of freedom, we have to observe many states, calculate huge amounts of information, and operate many actuators. In this study, we consider a flexible robot without sensors or controllers that can determine the inclination of a slope and climb up the slope. In order to demonstrate the effectiveness of the proposed framework, we have developed a prototype robot and conducted experiments. The result indicates that the robot could determine the inclination and climb up a gentle slope autonomously. Thus, we have realized an autonomous robot that has no explicit sensors or controllers.