水位监测系统设计

水位检测可以有多种实现方法,如机械控制、逻辑电路控制、机电控制等.介绍了一种基于无线发射和接收技术的新型水箱水位监测系统.     

MEMS系统级设计与基于多端口组件网络的建模方法

MEMS的系统级设计对保证其整体综合性能和合理开发MEMS产品至关重要。针对MEMS的多能量域耦合、多信号混合的特点以及能量非保守等特殊要求 ,提出了基于多端口组件网络的MEMS系统级建模方法———采用多端口组件表示MEMS的功能结构部件 ,组件与组件通过端口联成网络表示整个系统 ;用统一规范化的微分代数方程表征并用硬件描述语言表述多端口组件。针对梁等具体的MEMS功能结构部件 ,采用宏建模方法确定其行为方程 ,从而得到有特定物理意义的、可供重用的组件模型。最后 ,给出了微加速度计的基于多端口组件网络方法的系统级设计示例     

802.11n标准射频集成收发器的系统级设计

提出了一种符合802.11n草案标准的全集成CMOS射频收发芯片的系统级设计方法.根据802.11n草案的射频规范推算各模块性能指标,对各模块建模,搭建测试环境,进行系统仿真.仿真结果表明,该系统各性能指标满足802.11n草案协议的射频规范.     

基于单片机的水塔水位检测控制系统仿真设计

设计一种基于单片机水塔水位检测控制系统。该系统能实现水位检测、电机故障检测、处理和报警等功能,实现超高、低警戒水位报警,超高警戒水位处理。介绍电路接口原理图,给出相应的软件设计流程图和汇编程序,并用Proteus软件仿真。实验结果表明,该系统具有良好的检测控制功能,可移植性和扩展性强。     

浅谈系统设计在产品设计中的应用

当我们进入21世纪,计算机技术必不可少,计算机技术应用于产品设计,让设计更合理也更完美,最大程度上的符合产品的基本特征,计算机技术为产品设计与发展提供了平台,可以让产品设计的本质利用计算机技术挖掘出来,产品设计风格让人们的生活变得多姿多彩,产品设计是社会发展的重中之重,也是物质产品生产的必备程序之一。产品的优劣主要是由产品设计体现的,计算机使产品设计更加程序化、产业化,极大地丰富了产品物质。怎么样在现代社会中将计算机与产品设计相结合,并对产品设计进行更新与创新,是社会各界都在关注的问题。运用先进的科技,把计算机同产品设计相结合,才能够让计算机在产品设计中的应用发挥巨大的作用,从而丰富我们的工作和生活,让我们的物质生活更人性化、可持续化。     

浅谈系统设计在产品设计中的应用

当我们进入21世纪,计算机技术必不可少,计算机技术应用于产品设计,让设计更合理也更完美,最大程度上的符合产品的基本特征,计算机技术为产品设计与发展提供了平台,可以让产品设计的本质利用计算机技术挖掘出来,产品设计风格让人们的生活变得多姿多彩,产品设计是社会发展的重中之重,也是物质产品生产的必备程序之一。产品的优劣主要是由产品设计体现的,计算机使产品设计更加程序化、产业化,极大地丰富了产品物质。怎么样在现代社会中将计算机与产品设计相结合,并对产品设计进行更新与创新,是社会各界都在关注的问题。运用先进的科技,把计算机同产品设计相结合,才能够让计算机在产品设计中的应用发挥巨大的作用,从而丰富我们的工作和生活,让我们的物质生活更人性化、可持续化。     

带有大滞后的玻璃窑炉液位控制系统设计

本文针对带有大滞后环节的玻璃窑炉液位控制系统的研究和设计,提出将模糊控制和Smith预估控制相结合。结合玻璃窑炉液位升降的特点和现场实际情况,设计出了合理的位自动控制方案,利用MATLAB中的Simulink对系统进行仿真。     

基于单片机的超声波测控液位系统的设计

设计了一款超声波测控液位系统,它以单片机AT89S51为控制核心,控制超声波的发射与接收装置,利用超声波测距的原理测出液位的高度值通过显示器显示出来,并与预设定液位进行比较,根据比较结果值去控制阀门的开关与蜂鸣器报警。该系统测控液位不必浸入水中,使用方便,而且安全可靠,具有很强的实用性和灵活性,可推广用于工业生产中。该系统已经通过软、硬件调试,硬件系统测量液位在10～160cm范围内,可靠性与准确性极强,性能良好。     

校园网络行为管理系统的研究与设计

本文通过讨论校园网络的安全问题,研究网络行为管理系统的特点,给出系统的功能实现思路。     

A co-synthesis approach to embedded system design automation

Embedded systems are targeted for specific applications under constraints on relative timing of their actions. For such systems, the use of pre-designed reprogrammable components such as microprocessors provides an effective way to reduce system cost by implementing part of the functionality as a program running on the processor. However, dedicated hardware is often necessary to achieve the requisite timing performance. Analysis of timing constraints is, therefore, key to determination of an efficient hardware-software implementation. In this paper, we present a methodology for embedded system design as a co-synthesis of interacting hardware and software components. We present a decomposition of the co-synthesis problem into sub-problems, that is useful in building a framework for embedded system CAD. In particular, we present operation-level timing constraints and develop the notion of satisfiability of constraints by a given implementation both in the deterministic and probabilistic sense. Constraint satisfiability analysis is then used to define hardware and software portions of functionality. We describe algorithms and techniques used in developing a practical co-synthesis framework, vulcan. Examples are presented to show the utility of our approach.     

Partial scan design of register-transfer level circuits

Register-transfer level designs that are derived from high-level synthesis systems generally consist of functional blocks and registers that are interconnected by multiplexers and buses to maximize resource sharing These multiplexer and bus structures have the unique ability to behave asswitches, i.e., to logically partition the circuit when their control inputs are manipulated in different ways. The presence of switches, the selection of scan registers can be influenced. This leads to an efficient partial scan methodology presented in this paper. Second, switches help set up data transfer paths calledI-paths. By employingI-paths to transport test data, the functional logic in the circuit can be separated from the switching logic for the purpose of test generation. This can lead to a reduction in test generation costs for a partial scan design. Thus the techniques presented in this paper help to minimize both testability overhead and test generation cost in bus-based circuits. This methodology is implemented in the SIESTA system for serial scan design.     

新型离轴反射式变焦光学系统设计

介绍了一种基于初级像差理论和矢量像差理论的机械补偿式新型离轴三反变焦系统的设计。提出了反射变焦系统初始结构的确定方法,对初级像差方程进行了约束优化,得到了满足要求的部分共轴初始结构参数。指出了利用矢量像差理论进行离轴反射变焦系统设计的必要性,提出了弥补共轴系统不足的离轴反射变焦光学系统的设计方法,分析了相应的去除遮拦、矫正像差的设计理论,并结合具体的设计指标,采用CODEV光学设计软件,设计出符合系统指标要求的离轴三反变焦光学系统,并对其进行了像质评价。结果表明,成像质量良好,满足总技术指标的要求。     

Target software generation: an approach for automatic mapping of SystemC specifications onto real-time operating systems

In this paper we present a new approach for automated target code generation for given real-time operating systems out of SystemC to support platform independent software development. Since SystemC becomes the most important language in electronic system level design, the support of a seamless design flow becomes an important task. During the system design process, SystemC is used to develop a “Golden Reference Model” that provides a well-suited platform for specification, simulation, and verification of embedded systems. Based on the “Golden Reference Model,” an important task of the design process is to map applications, that have been described either in C++ or directly in SystemC, to the specific real-time operating system which is running at the target processor. Since a manual mapping approach is time-consuming and error-prone, the mapping process should be performed automatically. This paper presents a new method for automated generation of code for a specified operating system just by using an abstract XML representation of the RTOS API.     

电子设计正进入系统级时代

电子系统级(ESL)设计已成为当今嵌入式设计领域最炙手可热的话题。尽管在一定抽象层描述系统的想法已经出现近十年,直到现在众多成熟设计流程的出现才使得这一想法成为现实。     

通信设计质量管控系统研究与设计

随着通信行业的不断发展,为了提升通信设计质量,本文结合设计企业生产特点,提出了生产工具信息化、自动化、标准化建设的解决方案,即开发一个“通信设计质量管控系统”的研究构想,并探讨了系统功能架构以及多层次体系架构设计。通过引入移动信息化技术,把原有的手工纸面记录的生产方式转为信息系统自动操作,避免低级错误发生,达到了提升设计质量的目的。     

企业档案管理系统的分析与设计

在现代化管理体制的要求下,为了提升企业档案管理工作的科学化和规范化.本文以JSP和JAVA BEAN技术为主要开发手段,分析并设计了一套适应企业档案管理发展的现代化档案管理系统,极大地提高了企业档案管理工作和业务处理的效率.     

Comparative analysis of design concepts of mechatronics systems with a CAD tool for system architecting

In mechatronics systems design, designers need to deal with complexity derived from the integration of subsystems with various engineering disciplines. In particular, while developing product architecture for the next generation systematically, the present generation systems in the market should be reviewed in terms of their functional overview as well as module structure. This paper proposes a method for developing product architecture by a comparative analysis of the functional overview as well as physical decomposition of existing mechatronics systems. The method employs function–behaviour–state modelling and a computer-aided design (CAD) system for system architecting (SA-CAD) as a modelling scheme and modelling environment, respectively. The paper describes the application of the proposed method in the development of product architecture of autonomous vacuum cleaning robots.     

A Service Engineering framework to design and assess an integrated product-service

Companies are striving to create new sources of value, providing integrated product-service solutions to customers, evolving from a “pure product” orientation towards a Product-Service System (PSS) perspective. In this context, Service Engineering (SE), the discipline concerned with the systematic development and design of product-services, is becoming a predominant field. Most of the available Service Engineering models, methods and tools come from traditional engineering, business and computer science approaches adapted to the Service System or Product-Service System. In order to fill this gap, this paper proposes a Service Engineering framework that integrates a product-service design modelling tool developed at the Tokyo Metropolitan University with a discrete event simulation test-bench, enabling the comparison of several PSS configurations considering both customer satisfaction measures and internal performance. A sample case is reported to exemplify the different phases of the framework implementation.     

模块化设计在雷达系统中的应用

阐述了模块化设计及特点,介绍了模块化技术的优越性。重点讨论了模块化设计在雷达系统设计中的必要性和可行性,针对雷达产品的特点,概述了雷达模块化的意义和模块化的方向。     

网上调查统计系统的设计与实现

利用互联网进行信息收集和统计分析,不仅大大提高数据处理效率,更使数据统计准确可靠、数据分析科学。着重探讨了Windows环境下,基于SQL Server数据库的、比较复杂的网上调查统计系统的设计与开发。