Team center/NX集成下的工装快速设计系统设计及应用

本文针对现代工装设计过程中出现的问题,有效提高工装数据管理的有效性,本文就设计了基于Team center/NX的工装快速设计系统.首先实现工装系统模型设计的介绍,研究数据存储、管理及交互的集成功能介绍.之后对工装系统的设计进行了全面的介绍,包括辅助设计、变形设计等.最后全面分析工装设计的效率.通过研究表示,本文所设计的工装快速设计系统比传统的工装设计系统的效率有进一步的提高.     

UMC 0.18 μm异步电路标准单元库建库技术研究

标准单元是半定制设计的基本构建模块,它通过降低设计和调试时间,提高设计效率.在异步电路的发展过程当中,标准单元的缺乏成为异步电路设计的瓶颈.文章对标准单元的建库流程进行了研究,通过对流程的深入研究,得到了适用于自动化、大批量建库的脚本.采用这个流程,设计了异步电路的标准单元.利用所设计的异步单元,设计了一个异步电路芯片.结果表明,所给出的流程以及所设计的异步单元完全正确.     

大庆教育文化中心大剧场录音室声学设计

录音室的声学设计是录音室设计中的技术核心部分,主要包括背景噪声控制和混响时间控制.声学设计工作有隔声减振设计、体型扩散设计、吸声装修设计、空调消声设计等几方面,涉及建筑、结构、空调和装修等工种.以大庆大剧院录音室声学设计为例.详细介绍了录音室声学设计的过程和工程经验.     

低功耗异步LDPC解码器运算通路设计

本文设计了异步LDPC解码器运算通路,利用异步电路减少信号到达时间不一致引起的毛刺和时钟引起的功耗.利用输入数据的统计特性设计了运算通路中的主要运算单元,减少了冗余运算.本文还实现了同步运算通路和基于门控时钟的运算通路作为比较.三种设计采用相近的架构,在0.18μm CMOS工艺下实现相同的功能.仿真结果表明,提出的异步设计功耗最小,相比于同步设计和基于门控时钟设计,分别节省了42.0%和32.6%的功耗.虽然性能稍逊于同步设计,但优于门控时钟设计.其中,同步设计的延时是1.09ns,基于门控时钟的设计延时是1.61ns,而异步设计则是1.20ns.     

SOC中的MBIST设计

随着超大规模集成电路的发展,设计的集成度越来越高,基于IP的SOC设计正在成为IC设计的主流.为了确保SOC的功能正确,可测性设计(Design for Test,简称DFT)显得尤为关键.DFT设计包括扫描设计、JTAG设计和BIST设计.另外,当前SOC芯片中集成了大量的存储器,为了确保存储器没有故障,基于存储器的...     

通信设计企业信息化中协同设计模型研究

协同设计是指计算机技术支持的环境中,由一个群体协同工作完成一项设计任务.协同设计作为一种新的设计理念,已经被越来越广泛的应用.比起传统的设计方式,协同设计更为省时、准确,并且可以节约大量的资源.是当前通信设计企业信息化中必须考虑重要部分.本文在研究现有的设计行业工作模式及信息化框架的基础上,试图提出一种适合于通信设计企业的协同设计模型,将协同设计在企业信息化中定位、作用、关键问题、实施原则、实施方案等都给出一种可行的方案,以供企业在实施协同设计时参考.     

H.264图像解码芯片的布局布线设计

集成电路工艺发展到深亚微米阶段,IC设计向高速、高复杂度方向发展,物理设计也要满足更加严格的要求.布局布线设计成为集成电路设计的一个关键步骤.本文以一个实际设计为例阐述了在集成电路EDA设计工具的辅助下布局布线的具体实现方法,通过对设计结果的分析,解决了布线拥塞、时序收敛以及信号完整性等问题.该芯片最后达到设计预定的性能指标并交付流片.     

计算机网络设计中关系数据库技术的应用探析

信息化网络技术飞速发展的同时,也使得计算机网络设计得到较快发展.由于计算机网络设计工作难度较大,且设计过程十分复杂,所以必须建立相应的数据库进行保障.因此,关系数据库技术应运而生,它凭借自身的独特优势,被广泛应用到计算机网络设计中.本文先介绍了关系数据库的概况,接着分析了计算机网络设计中关系数据库技术的设计原理,进而对计算机网络设计中关系数据库技术的应用进行深入探究,以供参考和借鉴.     

系统级芯片设计与System C

随着集成电路制连技术的迅速发展,SOC设计已经成为当今集成电路设计的发展方向.SOC设计的复杂性对集成电路设计的各个层次,特别是对系统级芯片设计层次,带来了新的挑战.文章主要介绍了系统级芯片设计的理论以及这方面的最新研究成果--System C.     

动画中的人物设计与制作——以《一片叶子的旅行》为例

文章主要介绍了动画中的人物造型设计,包括动画人物设计的概念和重要意义、动画人物的设计理念与注意事项、实际设计动画人物的流程与方法.重点论述了动画人物设计过程中的方法与要点,动画人物造型的理念.动画人物设计是一部动画制作中的关键步骤,优秀的人物设计可以更好地表达作品内涵、推动剧情发展.因此,动画中的人物设计直接影响到整部动画的成败.     

工程部产品设计的标准化管理

工程部是PCB加工的起始点,是把客户资料转换成生产资料的重要环节,工程部产品设计的标准化在提升产品生产质量、提高产品生产效率、增加产品产量、降低产品成本,提高公司整体经济效益几个方面起到重要作用。     

Modified programmable logic array with more product terms

Some simple modifications to the basic programmable logicarray structure are described which result in an increase in the number of product terms available. Provided the degree of modification is small, then a worthwhile increase in the number of product terms is obtained with little disadvantage.     

应用可靠性强化试验技术提高产品的可靠性

简述可靠性强化试验技术的概念和效果，结合某产品的特点和试验设备的现状，对其实施强化试验，快速剔除产品潜在的设计缺陷，使产品更快进入可靠性成熟期，提高其可靠性，缩短研制周期。     

Updating a Modular Product: How to Set Time to Market and Component Quality

In the face of shorter product life cycles, designing products with modular component parts can shorten product development time and speed up the introduction of new products in the market. Utilizing stylized models, we examine the reuse/redesign, quality, speed-to-market, and marketing decisions for two consecutive generations of a multicomponent modular product. With modularity that assumes a stable product architecture, each component can be improved by incurring a design cost that is convex increasing in the level of quality. Our study generates the following insights. When development start-up (fixed) cost is negligible, it is profitable to upgrade every component part; otherwise, it is beneficial to reuse some of the existing parts without making any design improvements in order to save on development cost. In an effort to reduce product development time while maximizing profit, we found solid evidence that the productivity level in developing every component part can be a key driver of speed-to-market. Individually, a new product launch time postponement and an R&D budget increase can lead to improvements in component part quality and overall product quality, but our models show that better improvement in quality can be achieved from launch time postponement (budget increase) when product design teams have low (high) product development productivity. Finally, when the marginal cost of producing the new product is equal to that of the old product, it is optimal to remove the old product from the market and sell only the new product.     

Turbo Product Codes Based on Convolutional Codes

In this article, we introduce a new class of product codes based on convolutional codes, called convolutional product codes. The structure of product codes enables parallel decoding, which can significantly increase decoder speed in practice. The use of convolutional codes in a product code setting makes it possible to use the vast knowledge base for convolutional codes as well as their flexibility in fast parallel decoders. Just as in turbo codes, interleaving turns out to be critical for the performance of convolutional product codes. The practical decoding advantages over serially‐concatenated convolutional codes are emphasized.     

NEC公司的城域网解决方案及产品

随着大城市网络带宽需求的增加和技术的发展，城域网产品作为一个独立的产品系列已经脱颖而出。本针对NEC公司的产品，对城域网的构成及其应用提出了自己的观点。     

Power-bandwidth considerations in the design of MESFET distributedamplifiers

Quantitative procedures are given for the design of MESFET distributed amplifiers using series capacitors in the device gate circuits. It is shown that the choice of series capacitors allows the designer to trade gain for bandwidth while maintaining a given gain-bandwidth product. It is also shown that the input power capability can be increased by the use of series capacitors when the device pinch-off is the power-limiting factor. It is pointed out how the addition of series capacitors makes it possible to increase the gate periphery of an amplifier, which results in an increase in power-bandwidth product     

The impact of new product development acceleration approaches on speed and profitability: lessons for pioneers and fast followers

This work investigates the impact of nine new product development (NPD) acceleration approaches (supplier involvement, lead user involvement, speeding up activities and tasks, reduction of parts and components, training and rewarding of employees, implementation of support systems and techniques, stimulating interfunctional cooperation, emphasis on the customer, and simplification of organizational structure) on development speed and new product profitability. Our findings from 233 manufacturing firms show that lead user involvement and training/rewarding of employees increase both development speed and profitability. Supplier involvement, speeding up activities and tasks, and a simplification of the organizational structure also enhance development speed, while an emphasis on the customer has an additional positive impact on new product profitability. Both new product speed and profitability increase firm financial performance. Our results further show that pioneers and fast followers should not select the same NPD acceleration approaches as the speed and profitability impact of the majority of the acceleration approaches depends on the new product strategy of the firm. These results are important as they provide guidance for pioneers and fast followers regarding which NPD acceleration approaches to select in order to enhance speed and profitability and, hence, firm financial performance.     

Dependence of t.e.o. efficiency on NL product

As the NL product is increased, an increase in efficiency of t.e.o. devices is observed. This effect is theoretically explained in terms of the induced current caused by the moving space charge in the active layer. A limit on current peak/valley ratio for various NL product devices is presented.     

Adapting real options to new product development by modeling the second Toyota paradox

Uncertainty in product development projects creates significant challenges for managers who are under intense competitive pressures to increase product quality, while reducing development time and costs. Traditional wisdom dictates the early selection of a single design in order to freeze interfaces between product subsystems so that team members can work effectively in parallel, resulting in more productive product development efforts. Prior research, however, uncovered a paradoxical case. Toyota Motor Corporation achieves the fastest development times in its industry by intentionally delaying alternative selection, a strategy termed set-based development. The current work adapts real options concepts to product development management to partially explain this paradox. A formal simulation model is used to show that converging too quickly or too slowly degrades project value. Furthermore, the model demonstrates that the wisdom of set-based strategies can be explained by the application of a real options approach to product development management. Implications for managers and directions for future work are discussed.