高科技产品LED大屏幕智能显示屏

文中介绍由单片机或PC机控制的LED大屏幕智能显示系统的整机电路原理、主机工作程序及PC机控制程序     

气体浓度监测系统的设计

介绍了1种微机控制气体浓度监测报警系统。该系统由从机与主机构成(主机由PC机实现,从机以单片机AT89C51为核心,一般情况下从机与主机联成系统,但也能单独工作),可实现多点多路气体浓度的采集、显示、存储、查询、打印等功能。     

面像识别技术控制系统设计

面像识别技术应用系统中往往需要控制系统,介绍了一种PC机和51单片机串行通信方式来进行控制的方法。PC端采用VC++编程,用MSComm控件进行串口通信,通过RS-232进行PC机和51单片机的连接;单片机端采用汇编语言进行编程,通过对接收信号的判断来控制外部动作。本控制子系统设计方法已经在面像识别门禁系统中得到实现。     

单片机控制LED显示屏动态显示的设计

介绍了一种利用AT89C52单片机控制LED显示屏的设计方案,使显示屏具有动态显示功能,并能通过上位计算机修改显示内容,通过标准的RS232/485转换模块还可以实现对显示系统的远程控制.     

基于Lab VIEW和DS18B20的智能恒温控制系统设计

设计基于Lab VIEW软件的上位机与STM32下位单片机连接串口通信,STM32单片机采用“一线总线”接口和DS18B20温度传感器组成温度控制部分,整个过程实现了数字通信方式传输与控制,极大提高了整个恒温控制过程的稳定性以及抗干扰性能。STM32单片机通过优化的控制算法能对温度精确的进行控制,可以显示在由LabVIEW软件编写的上位机上,通过LabVIEW软件可实现直观的温度控制显示以及趋势曲线的显示并能够存储温度数据,方便各种数据查询分析以及智能控制。     

CIMPLICITY HMI组态软件在玻壳生产中的应用

安飞电子玻璃有限公司HDTV-68—1玻锥压机控制系统由美国AB公司PLC5—60、SCL和远程I／O模块等组成,使用GE公司CIMPLICITY HMI组态软件在上位机PC开发人机监控系统,通过工业以太网交换机可同时和PLC、SLC通信。该监控系统具有：①动态画面显示功能,PC机启动后,系统自动进入工程初始画面,设备工位画面显示设备运行状态、实际参数等信息,     

步进电机绘图系统设计

介绍了由步进电机、STC89C51单片机和上位机3部分组成的绘图系统。利用单片机和上位机间的串口通信实现对整个绘图过程的控制、曲线显示及系统分析等功能。系统采用细分驱动技术将步进电机步距角减小了1/2,提高了系统绘制精度。单片机部分包含键盘和LCD显示装置,提高了系统可操作性。整个系统设计具有成本低、程序简单、使用维护方便等特点。     

萃取精馏全回流过程的测量与控制

随着微处理器及大规模集成电路迅速发展,其应用领域不断延伸。生产过程的自动化控制已成为化工行业的主流。本文设计一套系统对精馏段、提馏段及溶剂回收段进行测量与控制,实现全回流的工艺要求。本设计以单片机为控制器,Pt100作为温度传感器,温度的采集是利用模拟运算电路及A/D转换器,温度的显示采用LED数码管显示,最后通过单片机对加热电阻丝的控制实现对温度的控制。     

LED阵列智能显示屏的设计

本文介绍 LED 阵列智能显示屏的设计方案。该装置采用单板机(或单片机)系统和高亮度 LED 阵列显示屏,为用智能显示代替传统的数字显示作了有益的探索。     

大型LED显示系统的设计与研制

绍了一种由单片机组成的大型ＬＥＤ显示系统的功能特点、硬件结构和软件框图。该系统由主单片机ＣＰＵ完成与ＰＣ机的通讯,同时完成数据存储、动画处理、循环显示等,由辅单片机ＣＰＵ完成显示画面的刷新。该系统能脱机和连续长期运行,具有结构简单、显示刷新速度快、成本低等特点。     

睡眠呼吸分析系统的串行通信

对利用C++Builder实现睡眠呼吸分析系统的串行通信方法进行了较为详细的阐述和分析,重点介绍了C++Builder中通信控件MSComm的功能特点、常用属性设置,并给出了睡眠呼吸分析系统中PC机与单片机血氧饱和度模块间串行通信的实现方法。     

基于正六边形网点的平移旋转加网机制研究

针对柔性版印刷加网角度的特殊性,结合正六边形网点的优点,提出了基于正六边形网点的平移旋转加网机制,并设计了加网阈值矩阵以及平移旋转机制,然后采用Matlab编程方法实现对标准灰度图的加网,从而验证了该加网机制的可行性。最后通过理论分析与实验计算,证明该加网机制中的旋转机制比较成功,而平移机制容易产生龟纹。     

两向正交正放网架结构传感器布置研究

为了找到两向正交正放网架结构传感器的布置方法,针对模态可观测性与损伤可识别性传感器布置结果不一致的特点,由结构运动方程出发,考虑结构响应与振型和损伤灵敏度之间的关系,根据Fisher信息熵原理,建立同时包含模态振型和损伤灵敏度信息的Fisher信息矩阵,确立以Fisher信息矩阵2-范数最大化为准则的目标优化算法,构建了目标函数NC值,在完好、单损伤和多损伤情况下,通过该方法获得该结构的传感器布置方案。     

Product Development Strategy and Organizational Learning: A Tale of Two PC Makers

The personal computer (PC) marketplace in the US presents a dizzying array of component suppliers and products. No single firm dominates the industry with a complete package of hardware and software components. Although one company's operating systems and general-purpose applications are installed on most PCs in the US, the other system components—processors, memory, storage devices, display adapters, monitors, specialized applications, and so on—come from any number of sources. David T. Methe, Ryoko Toyama, and Junichiro Miyabe point out that the PC industry in Japan also exhibits this decentralized nature. However, they also note that despite the decentralized network structure of the Japanese PC industry, one company—NEC—was able to achieve a dominant market share. To provide insight into the key issues involved in the management of complex technology, they contrast NEC's strategic approach to product development and organizational learning with the approaches taken by Fujitsu—the firm that placed a distant second in this market. Despite matching NEC in terms of technological capabilities, financial resources, and managerial talent, Fujitsu never managed to threaten NEC's dominance of the PC market in Japan. Fujitsu continually emphasized technological leadership, even at the expense of protecting its installed base. Poor coordination of resources and product development efforts resulted in incompatibilities among Fujitsu's various products, and the company failed to foster close relationships with suppliers of such key technologies as software and peripherals. NEC's PCs did not enjoy the advantages of first-to-market status or technological leadership. Instead, NEC achieved market dominance by finding the combination of product technologies that met the needs of the greatest number of consumers. Throughout almost 20 years of competition in the PC industry, NEC successfully maintained consistency and backward compatibility across its product lines. NEC also recognized the importance of third-party software developers, and carefully cultivated relations with these firms as a source of competitive advantage. In other words, NEC struck the right balance between three key factors: technological innovation, motivation of third-party developers of software and peripherals, and service to its installed base of customers.     

智能化LED手术无影灯的仿真及设计

对不同功率的LED阵列应用于手术无影灯进行了仿真,仿真表明无论使用多大功率的LED光源,均符合手术无影灯的要求.设计了智能化LED手术无影灯,采用单片机控制LED驱动模块,配以无线收发模块,可实现无影灯的自动调光、手动遥控调光,具有智能化、效率高、安全等优点.     

Development of automatic fault tree synthesis system using decision matrix

Fault trees synthesis, the basis for fault tree analysis (FTA), serves as a powerful tool for risk analysis. It has become a trend to accomplish computer-assisted fault tree synthesis in the field of system safety engineering because conventional manual construction of fault trees can be extremely time-consuming and vulnerable to human errors. This paper expounds upon a fault tree synthesis information system (FTSIS) developed by means of decision matrix for the purpose of its application to process plants, where the objective system is decomposed into a series of system components whose cause-effect models are constructed and stored in the relational database and transferred into decision matrix. The fault tree is synthesized automatically after the decision matrix is fully searched in FTSIS, the availability of which has been verified after it was put into effect successfully.