铁秦线站控系统数据通讯的实现

本文以黑山输油站自动化系统设计为背景，介绍了站控系统的网络配置、系统通讯时数据传输过程肪串行通讯接口的硬件连接及站控与子系统间通讯软件的设计。     

浅谈PROFIBUS

随着现场总线的应用越来越广泛,PROFIBUS作为最具影响力的现场总线技术之一,在工业控制领域占据了一定的主导地位.文中分析了PROFIBUS的产生、PROFIBUS的组成,重点分析了PROFIBUS在实际应用中的优点以及存在的问题,最后总结了PROFIBUS未来的发展趋势.     

软件测试自动化技术应用研究

为了保证系统的质量,提高软件测试的效率,在软件开发过程中,通过设计测试用例对系统进行相应的自动化测试,从而确定系统的不足以及需要改进的地方,降低编写和维护测试的开销,提高软件质量。文中通过对软件自动化测试的相关技术和应用的详细介绍,总结了软件测试自动化的特点和标准。针对软件自动化测试的不同环节中自动化测试工具及自动化测试方法的选择,将软件自动化测试划分为5个级别,验证了软件自动化测试的有效性和可重复性。     

EPA功能安全协议的研究与实现

现场总线在通信传输过程中,会受到各种通信故障的影响,而现场总线与功能安全的结合可降低这种影响。该文描述EPA功能安全通信模型,针对通信传输过程中可能出现的通信错误,采用时间戳、序列号、CRC校验等功能安全通信技术。给出EPA功能安全协议层的报文结构,阐述功能安全协议层的具体实现过程。     

Recent developments in processing systems for cell and tissue cultures toward therapeutic application

Innovative techniques of cell and tissue processing, based on tissue engineering, have been developed for therapeutic applications. Cell expansion and tissue reconstruction through ex vivo cultures are core processes used to produce engineered tissues with sufficient structural integrity and functionality. In manufacturing, strict management against contamination and human error is compelled due to direct use of un-sterilable products and the laboriousness of culture operations, respectively. Therefore, the development of processing systems for cell and tissue cultures is one of the critical issues for ensuring a stable process and quality of therapeutic products. However, the siting criterion of culture systems to date has not been made clear. This review article classifies some of the known processing systems into ‘sealed-chamber’ and ‘sealed-vessel’ culture systems based on the difference in their aseptic spaces, and describes the potential advantages of these systems and current states of culture systems, especially those established by Japanese companies. Moreover, on the basis of the guidelines for isolator systems used in aseptic processing for healthcare products, which are issued by the International Organization for Standardization, the siting criterion of the processing systems for cells and tissue cultures is discussed in perspective of manufacturing therapeutic products in consideration of the regulations according to the Good Manufacturing Practice.     

Small signal frequency response studies for plasma electrolytic oxidation

Plasma assisted electrochemical treatments provide new possibilities in surface modification of various materials including light weight alloys. However, their large-scale application is still restricted, mainly due to poor understanding of the process mechanisms and consequent limitations in process control and automation. This problem can be resolved if the frequency response (FR) of the system is known and applied for process diagnostics. Our previous work has shown the effectiveness of the large signal mode for FR studies of plasma electrolytic oxidation (PEO) of aluminium. This research is dedicated to FR measurements during PEO of Al in the small signal mode corresponding to small perturbations of voltage signal around large DC values. The study was carried out during PEO of Al at DC voltages which were varied from 450 to 600 V. The FR obtained is a frequency dependent admittance of the PEO electrolyser; this complex number is represented by a modulus and a phase angle. Under potentiostatic conditions, the modulus evolution strongly correlates with the average current value; therefore, it bears insufficient amounts of independent information. The FR phase angle measured within this study was never obtained before. Depending on the frequency, it varies between 0° and 70 ° in the capacitive domain. One of the most notable features of this characteristic is low values at 500-5000 Hz when microdischarges appear during PEO. The other feature is a correlation with the coating growth. As a result, a new diagnostic tool was developed and shown to be effective for evaluation of microdischarges and surface properties during the treatment, thus decreasing the uncertainty in the system.     

浙江省数字医院系统建设的现状及其发展

笔者对浙江省已建成的200多家医院进行了智能化建设的基础调查,并在此基础上阐述了数字医院系统的设计理念、组成以及建设中存在的问题。     

基于AutoCAD的装配图明细表自动生成系统开发

在AutoCAD平台上,基于ActiveX Automation技术,用Visual Basic开发出一套实用的机械设计辅助工具,实现了装配图中零件序号的标注及明细表的自动生成。介绍了零件序号标注及明细表自动生成系统的设计思想和实现过程,通过实例验证该系统可智能、准确地完成所需功能,提高了绘图效率,弥补了AutoCAD的不足。     

碳酸法制糖增稠过滤设备结构与应用方法

本文通过对碳酸法制糖生产中几种引进的增稠过滤设备结构与应用方法的介绍,重点列举了碳酸法糖厂一碳汁过滤应用增稠过滤设备的原理、工艺方案与使用效果,具体分析了影响增稠过滤系统运行效果的一些因素,说明了采用增稠过滤设备是制糖生产中关键技术的进步,有广泛应有前景。     

一种自动机学习和符号化执行的软件自动测试方法

针对高可信软件提出一种软件脆弱性自动测试方法。与传统测试方法不同,该方法对待测试程序进行预处理,使用自动机学习算法构造软件与环境交互的抽象机模型,在符号化执行迭代过程中利用抽象机模型指导符号化执行,并动态生成测试数据,同时精化交互抽象机用于后继的符号化迭代测试。解决了传统符号化执行测试技术中缺乏指引、具有较高盲目性的问题,同时也提高了符号化执行测试的效率和代码覆盖率。