产品外形协同设计系统的研究与实现*

提出了协同设计工作模式,给出了系统的工作流程,定义了用户的权限分配,研究了基于交互日志的传输方式,讨论了协同设计过程中的实时更新机制.最后采用了基于MVC的体系结构构建了一个原型系统,该系统在实际应用中,验证了该技术思路的正确性.     

天下视频Flash 制作下载转换通

宽带流行了,播客兴起了,FLV吃香了,菜鸟也坐不住了,迅即抱回了DV,开通了播客。历经N天修炼,Flash视频终于成为菜鸟的拿手好菜之一。播客的兴起,使得Flash视频(FLV)格式大行其道。究其原因,不外乎FLV视频避免了不安装特定视频插件就     

基于电磁感应的矿井探测方法研究及仿真

本文首先分析了矿井探测中遇到的信号干扰种类,结合噪声信号的特点,提出了基于电磁感应的矿井探测方法,给出了其原理图和设计原则.然后详细论述了电磁感应探测方法的具体实现,给出了各主要测试参数的计算公式,明确了在探测过程中需要采集的各种信号.为了验证提出的电磁感应探测方法,最后采用了MATLAB建立了仿真测试模型,并给出了仿真测试结果.     

面向智能电网的云计算技术研究

对面向智能电网的云计算技术进行了研究。首先,引入了云计算的基本概念,分析了它的关键特征。其次,将云计算和智能电网技术进行了融合,提出了智能云的概念。随后,深入研究了智能云的构建、资源管理和安全策略问题。最后,给出了结论和未来的研究工作。     

让经典延续! Win8开始菜单全攻略

没错,开始菜单从Windows95开始被正式应用到现在,她所带来的便捷已经深入人心,突然升级到Win8了,开始菜单取消了,我们似乎一下子变得无所适从,找不到重启、关机的按钮了,找不到控制面板了,找不到打印机了,找不到需要的程序了,才刚熟悉了在开始菜单中快速搜索文件,现在又不知道     

机会! 有木有?

<正>摩托罗拉移动被谷歌收购了,诺基亚和微软联姻了,惠普退出Web OS了,即使PC业务,惠普也有意让出了,乔布斯辞职了,苹果的威胁是不是会有所降低了?资本市场其实已经给出了最好的说明。市场在变化,这个时候对竞争对手而言,无疑是最好的一次追赶的机会。谷歌跑步入场,跑马圈地正当时摩托罗拉终于在挣扎了许久之后还是放弃了移     

IT融资：冬去春来，谁当领跑

地震震动了人心,奥运鼓舞了人心,金融海啸席卷了人心。 失业了,郁闷;降息了,还银行贷款少了,高兴。人们在悲喜交织中动荡着。     

智能家居及其发展趋势

介绍了智能家居的发展历程,阐述了智能家居的定义和功能,介绍了其关键技术和嵌入式在智能家居中的应用,预测了其发展趋势,阐明了研究智能家居的重要意义,并指出了智能家居在控制系统、智能建筑系统和计算机领域的广泛运用,将使电子科学和计算机科学等科学中产生革命性的变革.     

计算机网络安全剖析

网络的快速发展不仅给用户工作和生活带来了便利,但同时也带来了安全性问题。本文阐述了计算机网络安全的概念及现状,分析了计算机网络安全面临的威胁,探讨了计算机网络安全技术,对保障计算机网络安全提供了理论基础。     

2011年1-12月美国工业机器人统计数据

北美地区2011年工业机器人订单为19337台套,一举超越了2005年历史最高水平的18228台。较2010年增长47%,合11.7亿美元,金额增长38%。从行业领域看,汽车零部件厂商工业机器人订单大增,增加了77%,汽车行业订单增加了59%。金属加工工业增加了56%,半导体、电子器件、光学仪器等增加了24%。从用途来看,弧焊机器人增加了66%,点焊增加了78%,装配增加了63%,胶合增加了42%,搬运增加了30%。具体情况见下面图表。     

Optimal location policy for three competitive facilities

Competitive facility location problems have been investigated in many papers. In most, authors have applied location models with two competitors. In this paper three companies, which are mutually competitive, intend to locate their facilities in a linear market. It is well-known that Nash equilibrium solution for location problem does not include three competitive facilities. In this paper we present the optimal location strategies for three facilities. In our model we assume that the demands are continuously distributed in a linear market and the facilities are locating according to a specific order of sequence, A, B and C. We apply the Stackelberg equilibrium solutions for competitive location problems with three facilities. In our model, we consider the decision problems in three stages. In the first stage, we decide the optimal location of facility A, which is located optimally in respect to the remaining two facilities B and C. In the second stage, we determine the optimal location of facility B which is optimally located in respect to facility C, by utilizing the information on the location of facility A. Finally in the third stage problem we decide the location of facility C, optimally located by utilizing the information on the location of A and B. In the first stage, we need the optimal solutions of the second and third stages. In the second stage we need the optimal solution of the third stage problem. Therefore, first we solve the third stage problem which is the simplest. After that, we solve the second stage problem utilizing the optimal solution strategy of the third stage problem. In this paper we present the optimal location strategies for three facilities.     

Divergence-Free Wavelet Analysis of Turbulent Flows

In this paper we study the application of divergence-free wavelet bases for the analysis of incompressible turbulent flows and perform several experiments. In particular, we analyze various nominally incompressible fields and study the influence of compressible perturbations due to experimental and computational errors. In addition, we investigate the multiscale structure of modes obtained from the Proper Orthogonal Decomposition (POD) method. Finally, we study the divergence-free wavelet compression of turbulent flow data and present results on the energy recovery. Moreover, we utilize wavelet decompositions to investigate the regularity of turbulent flow fields in certain non-classical function spaces, namely Besov spaces. In our experiments, we have observed significantly higher Besov regularity than Sobolev regularity, which indicates the potential for adaptive numerical simulations.     

Dynamical analysis of fractional-order modified logistic model

In this paper, we study a fractional differential equation model of the single species multiplicative Allee effect. First we study the stability of equilibrium points. Further we give some sufficient conditions ensuring the existence and uniqueness of integral solution. In the last section we perform several numerical simulations to validate our analytical findings.     

Towards a Symbolic Interpretation of Approximate Reasoning

We study knowledge-based systems using symbolic many-valued logic and we focus on the management of knowledge through linguistic concepts characterized by vague terms or labels. In previous papers we have proposed a symbolic representation of nuanced statements. In this representation, we have interpreated some nuances of natural language as linguistic modifiers and we have defined them within a multiset context. In this paper, we continue the presentation of our symbolic model and we propose new deduction rules dealing with nuanced statements. We limit ourself to present new generalizations of the Modus Ponens rules dealing with nuanced statements.     

A methodology for the automation of medium or small manufacturing companies

Many products are produced by discrete manufacturing plants in lots of 100 items or fewer. Currently, most small and medium-sized manufacturing companies are far from computer-integrated automation. New computer-integrated manufacturing systems with their associated hardwares require tremendous initial investments that are beyond the means of most small and medium-sized companies. In this paper we investigate how these companies can upgrade and automate their existing facilities at a minimal and viable cost. In Section 2 we discuss main references (books and trade journals) that contain detailed information on software packages for automation. In Section 3 we discuss the criteria for selecting software packages. In Section 4 we discuss how to use the obtained information to create a data base of different alternatives. In Section 5 we outline different areas of manufacturing. For illustrations, we discuss manufacturing planning, intelligent systems, and computer areas. In Section 6 we discuss a new method for the selection of the best alternative using the data base. The method is a simple interactive paired comparison method based on a computer package developed on a personal computer.     

基于WebServices的基建项目管理系统的研究与实现

本文首先介绍了软件系统的开发背景和预期要达到的目标,然后在系统的体系结构上进行了简单的分析,在使用的关键技术进行了简单的介绍,对系统在系统安全方面进行了详细的介绍,最后介绍了整个软件系统的特点.     

基于并行人工免疫算法的变精度属性约简

为了避免传统的人工免疫算法在属性约简时陷入局部最优解,提出了具有自适应特性的并行人工免疫算法,并且运用该算法进行粗糙集的变精度属性约简。该算法构造了趋同算子,异化算子和传优算子,利用“趋同”算子的分布性特点实现多个子种群的并行搜索,利用“异化”算子来交换种群之间优秀个体的信息,维持种群的多样性,利用“传优算子”把当前最优抗体分配到各个子群体当中,实现群体跨越式进化。在各个算子操作过程中,为了从准确度和覆盖度两方面来度量生成的规则集合的不确定性,引入了不确定量度HVPRS作为评价因子,并以此为依据,自动调整抗体的交叉概率和变异概率,使得算法不仅具有自适应的特性,而且所提取的规则集具有较高的覆盖能力和泛化能力。最后通过某发电厂发电机级故障诊断的实例,表明该算法获得的故障诊断规则集合具有较高准确度和覆盖度,满足了实际故障诊断中的要求。     

Maximum entropy principle with imprecise side-conditions II: crisp discrete solutions

In this paper we consider the maximum entropy principle with imprecise side-conditions, where the imprecise side-conditions are modeled as fuzzy sets. In a previous paper our solution produced fuzzy discrete probability distributions and fuzzy probability density functions. In this paper we consider only discrete probability distributions and we have the constraint that the solution must be crisp (non-fuzzy).     

基于ZigBee技术的无线网络应用研究

对ZigBee技术的特点和应用领域进行了探讨，并对ZigBee技术和Bluetooth技术进行了比较。提出了在ZigBee无线网络中利用许可证技术进行设备身份认证的方法。