一种新型的霓虹灯扫描控制器

介绍一种用8031(8051)串口,联级新型的共阴极驱动芯片— —MAX7219霓虹灯扫描控制器。着重论述了该芯片的硬件特点、使用方法及软件编制方法, 给出了用该芯片驱动多点霓虹灯变压器的实例。     

高坝洲水电厂计算机监控系统改造

介绍高坝洲水电厂计算机监控系统改造工程的设计、结构、配置、功能,与原系统的差异以及安装调试,以期对其他水电厂监控系统的改造项目具有一定的借鉴意义。     

滦河梯级橡胶坝群建设水电站探讨

滦河流域水能资源蕴藏丰富,开发建设小水电潜力巨大。本文通过分析承德地区滦河流域水文、地质及水电站的建设情况,对利用梯级橡胶坝群建设水电站进行了探讨。     

Multiple human tracking in high-density crowds

In this paper, we introduce a fully automatic algorithm to detect and track multiple humans in high-density crowds in the presence of extreme occlusion. Typical approaches such as background modeling and body part-based pedestrian detection fail when most of the scene is in motion and most body parts of most of the pedestrians are occluded. To overcome this problem, we integrate human detection and tracking into a single framework and introduce a confirmation-by-classification method for tracking that associates detections with tracks, tracks humans through occlusions, and eliminates false positive tracks. We use a Viola and Jones AdaBoost detection cascade, a particle filter for tracking, and color histograms for appearance modeling. To further reduce false detections due to dense features and shadows, we introduce a method for estimation and utilization of a 3D head plane that reduces false positives while preserving high detection rates. The algorithm learns the head plane from observations of human heads incrementally, without any a priori extrinsic camera calibration information, and only begins to utilize the head plane once confidence in the parameter estimates is sufficiently high. In an experimental evaluation, we show that confirmation-by-classification and head plane estimation together enable the construction of an excellent pedestrian tracker for dense crowds.     

Design and optimization of buck and double buck converters by means of geometric programming

This paper describes a new method for determining the optimal components values and switching frequencies of buck DC–DC converters. First, we revisit some concepts of the optimization technique named geometric programming. Then, we observe that the problem of converter designing can be modeled by means of an objective function and certain constraints which can be written in a specific form known as the posynomial form. The constraints involve expressions that depend on magnitudes such as efficiency, bandwidth, and current and voltage ripples.     

一类高阶非线性系统的级联自抗扰控制

针对类似板球系统的一类高阶、强耦合、不确定非线性系统,利用backstepping算法的思想,提出以多个低阶自抗扰控制器级联实现控制的方法.通过各低阶自抗扰控制器的扩张状态观测器观测出各级对象的内外扰动,然后进行补偿,较好地解决了高阶非线性系统的不确定性、耦合性及干扰抑制问题.以板球系统的轨迹跟踪控制为例进行研究,所得结果表明,该方案适用于复杂高阶非线性级联系统的控制,具有良好的动态特性及鲁棒性.     

高压饱和气体制备系统饱和室多变量控制研究

高压饱和气体制备系统的饱和室出口压力、流量和温度调节系统是一个相互耦合的三输入三输出系统。针对以上特点采用部分解耦控制策略,压力—流量调节子系统采用静态解耦的专家控制方式,温度调节子系统采用串级模糊PID控制方式。通过仿真试验证明这种控制策略能够获得良好的控制效果。     

Design and Application of Quality Control Strategies at the Operational Level of a Production Process Chain

This paper presents strategies for an automated control of distortion at the operational level of a production process chain, as well as first steps towards a combined implementation in heat‐treatment processes. In order to minimise the loss of production due to quality defects, the first quality control loop will be implemented on an in‐process level. The second control loop within the reach of operational control includes the feedback of post‐process measurements of quality features. As such, the post‐process control loop optimises the set‐values of the in‐process control loop.     

类仙人掌及组合大系统结构能控的一些新结果

本文讨论了组合大系统的结构能控性。首先介绍了类仙人掌的图形概念，然后构造了一种新的图形概念－类仙人掌的串级联结，进而给出了检验不同组合下大系统的结构能控的充分条件。     

级连码和数据交织技术在数字HDTV中的应用

本文分析采用格状编码调制和自适应均衡技术对HDTV传输系统性能的影响以及HDTV同播传输的干扰环境,给出克服干扰的措施。设计一种适合于HDTV应用的级连格状编码和RS码方案,并对其进行计算机模拟,模拟结果表明:该方案具有较好的误码性能。