A Novel Digital Image Watermarking Scheme on Copyright Protection Based on Network Manufacture Environment

In this paper,we propose a novel wavelet-domain digital image watermarking scheme on copyright protection based on network manufacture environment.It codes the watermarking with error correcting coding and encrypts the watermarking with chaotic encryption.It embeds the watermarking into the coefficients which have large absolute values in the middle-frequency parts got by Discrete Wavelet Transform (DWT) repeatedly.The extraction doesn't need the original image.Experiment results show that the proposed scheme is easy to implement,and has good robustness to some attacks,such as JPEG compression,average filtering,median filtering,wiener filtering,pepper (?) salt noise,especially to cropping and scaling.In order to solve the prob- lem of the copyright protection of the network manufacture production,the problems of digital image production such as tamper preventing and watermarking attacks preventing and so on are discussed.It solves the problems of manufacture information such as secure exchange and transmissions and production copyright protection and so on.     

齿轮动力互研法的工艺系统分析

研齿过程中机床主轴系统的设计以及主要工艺参数的选择是影响研齿效果的重要因素。通过主轴系统的动态分析,可以解决电机与主轴间连接刚度的选择以及飞轮尺寸的选择问题。研齿过程中,齿轮的中心距要做不断的变动,变动的方式以及变动的速度对研齿工艺的可行性以及研齿精度都有很大的影响。分析表明,采用运动方向与原中心距垂直的方向是合理的。运动速度可采用恒速,也可以通过步进电机控制变速运动方式。     

A decision tree of neural networks for classifying images of wood veneer

Artificial neural networks for the classification of wood veneer by an automatic visual inspection system are presented. Initially, a single large neural network is implemented with eleven image features as inputs and thirteen outputs — one for each class of veneer. In order to improve on the classification accuracy of this single network, a decision tree of smaller and more specialised modular neural networks is introduced to achieve a classification by successive refinement. This results in a substantial improvement in classification accuracy. A key process in the design of a modular neural network is the use of normalised inter-class variation in the selection of the most appropriate image features to be used for its particular specialised classification task.     

淀积—热压工艺的理论模型及ZnSe多晶的实验结果

本文提出了一种多晶制做的新型工艺并阐述了其理论模型.这种工艺利用了淀积和热压制备多晶的优点.理论和ZnSe多晶的实验结果都表明这种工艺可以改善淀积多晶光学性能和机械性能.     

基于BPEL的制造业电子商务服务系统

针对网络化生产和制造业电子商务,在企业内外部集成的基础上,提出以服务集成的思想构建制造业电子商务服务系统。基于实际应用创建业务流程,提出系统的构件化实现模型,给出该业务流程到业务流程执行语言(BPEL)的映射,采用BPEL设计实现制造业电子商务服务系统。     

我国单螺杆压缩机的发展历程与进展

根据实际经历,从我国单螺杆压缩机制造技术的进展方面论述了我国单螺杆压缩机发展历程。     

高职网页设计与制作课程教学的几点改进

网页设计与制作是一门实践性很强的课程,该文主要根据高职院校学生实际情况并结合本人实际教学经验,从教学目标、教学对象、教学内容、教学方法等几个方面阐述如何改进本课程的教学,并探讨如何培养学生的实际动手能力。     

Development of an automated fiber optic winding machine for gyroscope production

Fiber optic gyroscopes (FOGs) present an increasingly attractive solid-state alternative to the traditional spinning-mass gyroscopes. FOGs additionally present a potential cost benefit over ring laser gyroscopes (RLGs), as they require no inherently expensive mirrors or other mechanical components. However, the potential cost benefit has yet to be realized. At the heart of a FOG is a sensing coil comprised of several hundred meters of several kilometers of optical fiber, wound in one of several special patterns designed to improve gyroscopic performance. Winding a fiber optic sensing coil traditionally is performed on a semi-automated machine with the constant involvement of an operator. It is a complex process that can take as much as a week to complete. This paper describes the development of a fully automated fiber optic winding machine capable of accurately winding several different coil patterns, incorporates active tension control during winding, and includes a vision-based, automated error detection and correction system for improved reliability. The resulting machine can reduce winding times by as much as an order of magnitude.     

CIMS应用工程中实时数据库的集成

CIMS应用工程领域的拓展对实时数据库的集成提出了要求,本文在分析实时数据库的特点和实现方法的基础上,提出CIMS／实时DBS的组成模型以及集成时的关键技术和解决方案。     

再论21世纪中国水泥工业的科技进步(Ⅱ)

交叉流高固气比悬浮预热预分解技术和高性能低消耗新型水泥将成为新世纪水泥科技进步的主导方向．工业废渣、城市建筑和生活垃圾的资源化利用．将使水泥工业成为绿色工业的先行行业．而我国水泥工业的技术跨跃，有赖于新型水泥材料及其生产过程基础理论研究的原创性突破．衡量专业基础理论研究原创性突破的原则为：生产力发展对新理论是否需求(适时性)，新理论是否涵盖旧理论(包容性)，新理论是否揭示了前人或旧理论没有(或无法)说明的规律(新颖性)，新理论是否对本领域的技术进步有前瞻性的指导意义(先导性)．