同步时序逻辑电路设计步骤研究

通过对时序逻辑电路设计部分教学过程的设计步骤分析研究,强化了原始状态的确定在设计过程中的重要性,在清晰设计思路,强化时序逻辑电路经典的设计方法的同时,补充了与实践应用相关的设计实例,完善了时序逻辑电路的设计步骤。     

卫星应急通信指挥平台设计方法论

卫星应急通信指挥平台设计是一项复杂的系统设计工作,需要设计人员掌握和运用多种设计方法。本文概括性地归纳了卫星应急通信指挥平台设计的一般性方法论,分析了卫星应急通信指挥平台设计的基本原则、主要特征、性质分类,总结了设计过程中运用的传统设计方法和现代设计方法,包括模型设计法、常规设计法、系统设计法和可靠性设计法等4种主要设计方法,为设计人员进行卫星应急通信指挥平台设计提供了理论指导。     

基于Matlab Guide的低通滤波器设计

为简化模拟低通滤波器设计繁琐的技术过程,实现图形用户界面,方便工程应用。文中采用Matlab Guide图形用户界面设计工具对低通滤波器设计软件进行编程实现,介绍了低通滤波器的设计过程和Matlab Guide工具的设计流程,构建了低通滤波器设计软件界面,并通过设计应用举例说明了低通滤波器设计软件的使用过程,便于推广至任意模拟滤波器设计。     

车载火控雷达结构造型设计

从火控雷达结构造型设计的角度,阐述了结构造型设计的复杂性,提出了军事装备造型设计应有的理念。介绍了某车载火控雷达结构造型设计,提出了车载火控雷达结构造型设计中必须把握的问题,并进行了较细致的设计分析。     

Nand Flash控制器的规格设计

本文介绍了一个高速大容量Nand Flash存储器控制器的设计规格的设计过程.描述了本设计规格的背景,应满足的设计要求,设计规格的特色和思考策略,提供了应用本设计规格进行设计的系统构成.     

雷达伺服系统维修性设计

文中对雷达伺服系统维修性设计进行了讨论.介绍了维修性概念、维修体制,分析了维修性设计准则、模块化设计、测试与故障诊断、可达性设计等维修性设计要素,提出了评价维修性设计的主要要素,通过分析讨论提高对伺服系统维修性设计的重视与研究.     

军用电子设备的造型设计

本文阐述了造型设计的基本概念 ,分析了我国军用电子设备造型设计的现状和差距 ,讨论了美学法则在军用电子设备造型设计中的具体运用以及军用电子设备具体的造型设计方法 ,给出了造型设计实例     

软硬件协同设计技术在H.264解码器设计中的应用

作为SoC设计的三大关键支撑技术之一,软硬件协同设计技术已经得到了越来越广泛的应用。针对H.264解码芯片的设计,本文提出了一种软硬件协同设计、仿真以及验证的系统模型。设计实践证明,软硬件协同设计有效地提高了设计效率,加快了开发进度。     

基于IP核的8位微控制器设计

设计能力和工艺集成能力之间差距的不断扩大阻碍了片上系统的有效开发,为此必须提高设计人员的设计能力,降低产品开发周期和成本.利用IP参数化技术,把设计重用方法应用于8位微控制器设计,提出了基于IP核重用的8位微控制器设计方法,重用开发人力消耗节约70%,显著提高了设计效率,并通过实际微控制器系列设计实例阐述了该设计方法的实施和IP核复用策略.     

基于梯形图-VHDL的CPLD开发方法研究

本文对直接采用CPLD器件设计顺序控制逻辑电路时设计效率不高的问题进行了分析,提出了将梯形图工具与VHDL程序相结合的设计方法以提高设计效率,并研究了用VHDL语言实现梯形图的方法。设计实例证明,这种基于梯形图的VHDL设计方法正确可行,可以提高设计效率。     

Concurrent design of machined products: a multivariate decisionapproach

In the traditional process of product design, a sequential approach treats each of the design steps individually without considering requirements of manufacturing, assembly and other downstream activities in the product life cycle. The lack of systematic and simultaneous consideration on the impact of design decisions on manufacturing and assembly leads to repeated and excessive changes in design and processes. To resolve this problem, the concurrent engineering approach to product design foresees and avoids potential design flaws by incorporating design requirements from downstream activities of the product development life cycle early in the design stage. This research develops a methodological framework for product life cycle design in concurrent engineering. Through a cohesive organization of semantics of high-level design features and relationships, this representation provides a means to evaluate the impact of design on subsequent activities in the product life cycle, including design for manufacture (DFM), design for assembly (DFA), and design for productivity (DFP). In the first stage of a two-level design, selection of design candidates is made based on multiple design criteria using utility theory taking into account imprecision of design information and user preference. The second stage of design further fine-tunes attribute values of the selected design by a genetic algorithm based parametric optimization procedure. An illustrative example of two alternative designs of a milling fixture demonstrates the effectiveness of the framework and its implementation methodology     

数字合成扫频仪USB2.0接口设计

在对数字合成扫频仪的硬件设计进行概述的基础上,描述了一种基于ISP1362的USB2.0接口设计方案,包括USB接口的硬件结构设计,USB固件程序、驱动程序以及应用程序的设计方法。实验表明,整个设计满足设计要求,传输速率可达33 Mbit·s^-1。     

Hardware/software co-design of the Stanford FLASH multiprocessor

Hardware/software co-design is a methodology for solving design problems in systems with processors or embedded controllers where the design requirements mandate a functionality and performance level for the system, independent of the hardware and software boundary. In addition to the challenges of functional correctness and total system performance, design time is often a critical factor. To design MAGIC, the programmable memory and communication controller for the Stanford FLASH multiprocessor, the authors employed a hardware/software co-design methodology. This methodology allowed them to concurrently design the hardware and software thereby reducing design time while simultaneously ensuring that the design would meet ambitious performance goals. Serializing the hardware and software design would have lengthened the design time and significantly increased the amount of redesign when the tradeoffs between the hardware and software implementations became clear late in the design process. The co-design approach led them to build a series of hierarchical simulators that allowed them to begin design verification early and to reduce the level of effort required to ensure a functional design     

无轨导航机器人系统架构设计

本文重在介绍无轨导航机器人系统架构设计方法,呈现如何从整体需求分解到不同技术领域具体实现的一种设计思路。在系统设计上分为结构、硬件、软件三个部分,分别对每一部分进行详细介绍。本文以轮式无轨巡检机器人为例,从其需求分析、整体实现思路到整机结构、硬件及软件方案等方面进行了详细设计。文章主要目的是为相关领域的机器人设计人员提供一种机器人整机系统的通用设计思路及方法。     

高校体育类专业招生管理系统数据库设计

目前我国高校招生普遍使用计算机系统,数据库设计是开发系统的核心工作.针对体育类招生考试需要处理大量数据以及软件开发难等问题,以体育类专业招生需求分析为基础,运用新奥尔良法进行数据库设计.首先,进行概念结构设计,设计结果用E-R模型表示;然后,进行逻辑结构设计,按照设计原则将E-R模型转换为关系结构;最后,进行完整性设计,包括实体完整性设计、参照完整性设计和用定自定义完整性设计.设计的数据库具有完整性好、安全性高、操作速度快等优点,为开发性能优良的体育类招生管理系统奠定了基础.     

卫星通信终端的低功耗设计要点

低功耗设计在各大电子产品设计工作中得到了十分广泛的应用,尤其是在卫星移动通信终端中,低功耗设计更是起到了至关重要的作用。文章对卫星移动通信终端的发展现状展开深入分析,并在此基础上提出了卫星移动通信终端的低功耗设计措施。     

Optimizing the concurrency for a group of design activities

This research focuses upon the optimization of the concurrency between upstream product design activity and downstream process design activities in the concurrent engineering product development pattern. First, a new model of concurrent product development process, i.e., the design activity group model, is built. In this model, the product and process design activities are carried out concurrently with the whole design process divided into several stages, every two of which are separated by a design review activity. The design review activities may lead to design iterations at a certain rate of probability. Therefore, a probability theory-based method is proposed to compute the mean duration of the design activity group and the mean workloads of all the design and review activities, with design iterations taken into consideration. Then, the problem of concurrency optimization is defined mathematically, whose objective is to minimize the total costs for delay of design activity group completion time and unnecessary design revision workloads. Our research proves that the cost function is convex with respect to the concurrent (or overlap) degree between design activities and that it must have a minimum value at a unique optimum point. Based on this property, a one-dimensional search algorithm that is exponentially converged is finally proposed for solving the problem.     

某数字式控制器电磁兼容性设计与分析

介绍了数字电路中电磁兼容的目的和意义,通过分析某数字式控制器的具体结构、干扰源及其传播路径和特点,提出了从4个方面进行电磁兼容设计与改进,即系统设计、机械结构设计、滤波器设计和接地设计,并通过具体的频谱扫描图对设计改进前后进行对比,验证了理论分析与设计改进措施的合理性与正确性。     

某城市综合体电气设计综合布线系统设计

某大型城市综合体项目的电气设计是整个项目设计的一部分。电气设计包括强电设计和弱电设计,综合布线系统是建筑智能化系统(弱电系统)的重要组成部分。针对此项目的特点,分析了项目综合布线系统整体设计思想,然后介绍了各子系统的设计要求和设计内容,最后通过部分综合布线系统图,进一步阐述了各个子系统之间的关联方式和配置。     

一种新型校车智能监控终端的设计

近年来不断发生的校车事故引发了全社会对校车安全的普遍关注,本文设计了一种校车智能监控终端的设计方案,该系统要包括GPS定位模块设计、RFID无线射频识别模块设计,音视频模块接口模块设计、CAN总线接口模块、3G无线传输接口模块设计、存储模块设计、提醒及报警模块设、电源模块设计以及基于ARM9的控制平台等。本设计采用实时性高的ARM9处理器芯片作为控制器的核心,提高车载智能终端的同时,维护预期目标的设计理念,能够保证各个终端信息同时满足客户需求。