啤酒糖化过程微机自控系统

针对啤酒糖化过程工艺控制水平的重要性,介绍了微机自动控制系统的结构、功能、控制关键及系统运行效果。     

基于划分策略和填充曲线的抖动模式研究

抖动处理是计算机图形学和图像处理中的一项关键技术,抖动算法的好坏直接关系互图像打印质量的优劣,针对利用评价函数生成较大抖动模式比较困难的问题,提出了划分初始模式的方法,并渐进生成较大抖动模式,针对模式抖动中出现的边界赝象,引入填充曲线机制加以消除,实验表明,采用以上方法得到的结果比较令人满意。     

一种新的CMOS组合电路最大功耗快速模拟方法

过大的峰值功耗会使芯片承受过大的瞬间电流冲击,降低芯片的可靠性及性能,因此有效地对电路最大功耗做出精确的估计非常重要。由于在实际电路中存在的时间延迟,而考虑延时的电路功耗模型计算量较大,因此用模拟方法求取电路最大功耗非常耗时。为了在尽可能短的时间内对VLSI电路的最大功耗做出较为可信的估计,首次提出了二阶段模拟加速方法。对ISCAS85电路集的实验结果表明,这种估计方法具有最大功耗估计值准确和加速明显的优点。     

干涉型光纤水听器调制解调方案研究􀀁

本文概述了 Mach-Zehnder干涉型光纤水听器两种不同的调制解调技术 ,着重分析了用 3× 3耦合器组成的干涉型光纤水听器的解调原理 ,并比较分析了这两种方案的特点 ,指出采用 3× 3耦合器解调技术是将来构成全光纤干涉型水听器系统的优选方案     

Discrete surface Ricci flow

This work introduces a unified framework for discrete surface Ricci flow algorithms, including spherical, Euclidean, and hyperbolic Ricci flows, which can design Riemannian metrics on surfaces with arbitrary topologies by user-defined Gaussian curvatures. Furthermore, the target metrics are conformal (angle-preserving) to the original metrics. A Ricci flow conformally deforms the Riemannian metric on a surface according to its induced curvature, such that the curvature evolves like a heat diffusion process. Eventually, the curvature becomes the user defined curvature. Discrete Ricci flow algorithms are based on a variational framework. Given a mesh, all possible metrics form a linear space, and all possible curvatures form a convex polytope. The Ricci energy is defined on the metric space, which reaches its minimum at the desired metric. The Ricci flow is the negative gradient flow of the Ricci energy. Furthermore, the Ricci energy can be optimized using Newton's method more efficiently. Discrete Ricci flow algorithms are rigorous and efficient. Our experimental results demonstrate the efficiency, accuracy and flexibility of the algorithms. They have the potential for a wide range of applications in graphics, geometric modeling, and medical imaging. We demonstrate their practical values by global surface parameterizations.     

最短响应时间优先请求分配算法的研究

分析了在分布式高性能防火墙中两种常用的请求分配算法,在此基础上提出了最短响应时间优先调度算法。仿真表明,该算法具有很好的调度效果和很高的稳定性。     

基于Delphi的微机数据采集监测系统开发

计算机对化学实验数据进行实时采集和处理具有效率高和可靠性好等优点 ,以往采用单片机、PLC系统的较多 ,为了改进系统的设计 ,采用自行设计的小信号调理接口板、智能数据采集模块、RS - 485网络与微机连接的硬件设计 ,以及先进的Delphi语言和面向对象的软件开发技术 ,成功地开发出一种通用、任意通道的微机数据采集监测系统。该系统通用性和扩展性好 ,可以进行多通道、远距离的数据采集。系统硬件、软件和网络结构设计灵活 ,功能强大 ,首先在 72 1型分光光度计上得以成功应用 ,并可广泛应用于多种化学实验和相关科学研究与教学中     

基于DSP的电阻点焊控制器设计

基于SEED-DEC2407的控制模板设计和开发了一个电阻点焊控制器。先对DSP控制模板的各功能模块和软件集成开发环境进行了简要介绍,然后根据电阻点焊过程的功能要求,设计了电阻点焊控制器的总程序框图,并分别对UART模块、定时器模块、D/A模块、I/O模块进行了软件编程与调试,最后对点焊控制器的总程序进行调试与应用。实践结果表明,本文设计的电阻点焊控制器是可行的。     

Theoretical and evolutionary parameter tuning of neural oscillators with a double-chain structure for generating rhythmic signals

A neural oscillator with a double-chain structure is one of the central pattern generator models used to simulate and understand rhythmic movements in living organisms. However, it is difficult to reproduce desired rhythmic signals by tuning an enormous number of parameters of neural oscillators. In this study, we propose an automatic tuning method consisting of two parts. The first involves tuning rules for both the time constants and the amplitude of the oscillatory outputs based on theoretical analyses of the relationship between parameters and outputs of the neural oscillators. The second involves an evolutionary tuning method with a two-step genetic algorithm (GA), consisting of a global GA and a local GA, for tuning parameters such as neural connection weights that have no exact tuning rule. Using numerical experiments, we confirmed that the proposed tuning method could successfully tune all parameters and generate sinusoidal waves. The tuning performance of the proposed method was less affected by factors such as the number of excitatory oscillators or the desired outputs. Furthermore, the proposed method was applied to the parameter-tuning problem of some types of artificial and biological wave reproduction and yielded optimal parameter values that generated complex rhythmic signals in Caenorhabditis elegans without trial and error.     

基于Workbench车辆减振器弹簧盘的疲劳分析

车辆减振器弹簧盘在不断受到弹簧交变挤压力作用下,极易发生疲劳损坏.本文建立了弹簧盘的有限元模型,基于ANSYS-Workbench平台,对弹簧盘进行静力学强度和疲劳分析,预测了弹簧盘疲劳寿命的大小,获得了弹簧盘变形、应力集中及疲劳损伤的大小及位置,得到弹簧盘应力集中和疲劳损伤均发生于弹簧盘凸包区域的结论,验证其疲劳寿命符合设计要求,为其进一步改进设计提供参考依据.