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1.
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.  相似文献   

2.
谢立新 《微计算机信息》2008,24(10):252-253
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.  相似文献   

3.
<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  相似文献   

4.
因特网的发展引起了新的产业革命,变革了经济的运行模式,刺激了广大企业的创新意识,促进了教育的普及和提高,大大改变发展中国家的工业化模式,甚至会改变国家之间的力量对比。不仅如此,互联网还造就了崭新的一代群体。就像60年代电视改变了人们的娱乐方式,造就了“电视一代”;80年代电脑改变了人们的工作方式,促成了“电脑一代”一样,九十年代Internet改变了人们获取信息的方式,诞生了“网络一代”。互联网对人类社会的影响是深刻而长远的,即给人们带来挑战,更给人们带来机遇。  相似文献   

5.
李树龙 《网友世界》2014,(6):111-111
科学技术的日新月异发展,推动了素质教育的进程,多媒体技术已经走进了课堂,本文阐述了小学数学教学应用多媒体技术,激发了学生浓厚的学习兴趣,化解了教学重点难点,营造了良好的氛围,优化了课堂教学,提高了课堂教学效率。  相似文献   

6.
本文简述了计算机病毒产生的机理,根据计算机病毒的感染方式对病毒进行了分类,详细地介绍了如今十分流行的病毒.同时还详细探讨了病毒的入侵方式,分析了病毒可能产生的各种溢出漏洞和后门,给出了具体的防范措施和几种对抗计算机病毒的一些有效的软件,并对未来病毒的形式以及抗病毒技术进行了预测.  相似文献   

7.
朱勐  庄毅 《计算机仿真》2004,21(9):24-26
该文介绍了某型降落伞投放实验仿真系统的组成、功能、设计思想和实现的方法。首先讨论了仿真系统的建模,提出了系统的功能并给出了整个系统的数据流图。接着介绍了伞系统的建模方法,重点讨论了主伞衣的模型和降落过程的实现。然后介绍了投放环境的仿真方法,讨论了天空、地形以及飞机的建模方法。最后给出了一个利用Open GL实现该系统的方法,并显示了系统的运行情况。该系统能真实反映降落伞的整个投放过程。  相似文献   

8.
基于工作流的B/S模式OA系统设计与实现   总被引:2,自引:0,他引:2  
根据现代化办公的要求,通过对OA系统中工作流的分析,提出了一个基于工作流的OA系统模型,论述了采用B/S结构的优势,在ASP.NET环境下实现了OA系统的开发,介绍了系统中流程的设计及关键部分的实现细节.本系统功能齐全,使用简便,满足了企事业单位日常办公需求,利用工作流技术和Web环境规范了办公流程,降低了办公成本,提高了办公效率.  相似文献   

9.
基于ActiveX控件的雷达动态信息系统的实现   总被引:3,自引:2,他引:1  
简述了机载雷达记录信息的特点,提出了信息搜索及目标再现的优化算法,给出了对于多目标动态雷达信息的计算机分析与再现方法.利用ActiveX控件技术,实现了软件系统的可移植性,有效地解决了机载雷达告警记录信息处理的通用性问题,满足了不同层面应用的需要,提高了部队的战斗力.  相似文献   

10.
基于构件技术的通用ATS框架设计   总被引:2,自引:1,他引:1  
通过总结传统测试系统开发方法的弊端,提出了通用ATS框架的概念,并分析了其优越性;然后介绍了构件及框架的基本概念,给出了ATS框架的设计方法及开发过程;分析了框架的整体结构,详细研究了构件在ATS框架的测试管理、数据管理、仪器管理和网络通信4个子系统中的应用;最后识别出了各个子系统的扩展点,利用Strategy、Template等设计模式的软件技术方法对扩展点进行了设计,实现了通用ATS面向对象框架,提高了系统的复用性和可扩展性,达到了ATS测试软件设计高效率,低成本的要求。  相似文献   

11.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

12.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

13.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

14.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

15.
基于复小波噪声方差显著修正的SAR图像去噪   总被引:4,自引:1,他引:3  
提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。  相似文献   

16.
Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.  相似文献   

17.
正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where  相似文献   

18.
正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.  相似文献   

19.
The relative concentrations of different pigments within a leaf have significant physiological and spectral consequences. Photosynthesis, light use efficiency, mass and energy exchange, and stress response are dependent on relationships among an ensemble of pigments. This ensemble also determines the visible characteristics of a leaf, which can be measured remotely and used to quantify leaf biochemistry and structure. But current remote sensing approaches are limited in their ability to resolve individual pigments. This paper focuses on the incorporation of three pigments—chlorophyll a, chlorophyll b, and total carotenoids—into the LIBERTY leaf radiative transfer model to better understand relationships between leaf biochemical, biophysical, and spectral properties.Pinus ponderosa and Pinus jeffreyi needles were collected from three sites in the California Sierra Nevada. Hemispheric single-leaf visible reflectance and transmittance and concentrations of chlorophylls a and b and total carotenoids of fresh needles were measured. These data were input to the enhanced LIBERTY model to estimate optical and biochemical properties of pine needles. The enhanced model successfully estimated reflectance (RMSE = 0.0255, BIAS = 0.00477, RMS%E = 16.7%), had variable success estimating transmittance (RMSE = 0.0442, BIAS = 0.0294, RMS%E = 181%), and generated very good estimates of carotenoid concentrations (RMSE = 2.48 µg/cm2, BIAS = 0.143 µg/cm2, RMS%E = 20.4%), good estimates of chlorophyll a concentrations (RMSE = 10.7 µg/cm2, BIAS = − 0.992 µg/cm2, RMS%E = 21.1%), and fair estimates of chlorophyll b concentrations (RMSE = 7.49 µg/cm2, BIAS = − 2.12 µg/cm2, RMS%E = 43.7%). Overall root mean squared errors of reflectance, transmittance, and pigment concentration estimates were lower for the three-pigment model than for the single-pigment model. The algorithm to estimate three in vivo specific absorption coefficients is robust, although estimated values are distorted by inconsistencies in model biophysics. The capacity to invert the model from single-leaf reflectance and transmittance was added to the model so it could be coupled with vegetation canopy models to estimate canopy biochemistry from remotely sensed data.  相似文献   

20.
This article discusses the history and design of the special versions of the bombe key-finding machines used by Britain’s Government Code & Cypher School (GC&CS) during World War II to attack the Enigma traffic of the Abwehr (the German military intelligence service). These special bombes were based on the design of their more numerous counterparts used against the traffic of the German armed services, but differed from them in important ways that highlight the adaptability of the British bombe design, and the power and flexibility of the diagonal board. Also discussed are the changes in the Abwehr indicating system that drove the development of these machines, the ingenious ways in which they were used, and some related developments involving the bombes used by the U.S. Navy’s cryptanalytic unit (OP-20-G).  相似文献   

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