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1.
采用函数d1/dx1+exp(x)为分辨因子与样条小波滤波器相作用构成样条小波峰分辨器,对毛细管电泳窄锐重叠信号的处理,得到较好结果,在重叠峰分辨的同时滤去噪声,达到了同时滤噪和分峰的目的。被处理的重叠信号得到基线分离,分峰前后峰位置和峰面积的相对误差小于5.0%。应用于5个芳香胺类化合物的混合物的毛细管电泳窄锐重叠信号的处理,得到满意结果。  相似文献   

2.
一种新型的曲线拟合技术在分析信号处理中的应用   总被引:6,自引:3,他引:3  
研究了一种新型的曲线拟合技术--样条小波最小二乘法(SWLS)在处理分析化学信号中的应用。作为一种滤除噪声的新技术,详细了各种滤波对滤波结果的影响。若选择了合适的参数,就可以从信噪比S/N=0.5的高噪声中提取有用信息。且峰电流的误差小于3.0%,峰电位的误差小于10%。并将之与小波多频率通道滤波法(WMCD)及样条最小二乘法(SLS)进行了比较,发现该方法可以解决WMCD及SLS中存在的一些问题  相似文献   

3.
以B-样条小波为分析小波,提出了用于分析化学重叠信号解析的新方法一连续样条小波变换。详细讨论了采用二阶、三阶、四阶基数B-样条小波函数时,连续样条小波变换对重叠信号的解析,结果表明:连续样条小波变换应用于分析化学信号的处理,能使峰变窄同时还能提高信号的信噪比,是一种新型有效的重叠信号解析方法;对比三种样条小波基的处理结果,二阶B-样条小波基优于其余两种。  相似文献   

4.
样条小波最小二乘法处理毛细管电泳信号   总被引:2,自引:2,他引:0  
运用样条小波最小二乘法(SWLS)处理峰形尖锐的毛细管电泳信号,获得满意结果。经过两次处理后,与样条小波变换处理结果相比,不仅噪声被滤除,峰形不变,峰高不受影响;数据点无须为2^n(n∈z)。  相似文献   

5.
将小波变换用于对频域信号的处理,提出了用频域小波变换获得的模糊项作为线性函数的Fourier去卷积法.与其他FSD方法相比较,本文提出的方法对不同类型峰形信号如HPLC信号均具有良好的分辨效果.由于不用选择线性函数,该方法还具有通用性较强,操作简便等优点.重叠峰分辨效果好的主要原因是由于从Fourier变换得到的模与其经小波变换获得的模糊项具有相似的线性和峰宽,能较大程度与原始谱峰相符.该方法有望用于不同类型重叠峰信号的分辨.  相似文献   

6.
本文采用了样条卷积(SC)的方法用以分辨重叠峰,通过这个方法考察了有机氯类农药DDT中的2个同分异构体P.P‘-DDD和O.P‘-DDT气相色谱重叠峰,结果表明信号峰的分辨率由处理前的0.840提高到处理后的1.496。  相似文献   

7.
采用Daubechies正交小波滤波和样条卷积分峰联用方法对信噪比S/N≥2的含噪重叠双峰进行滤噪和分峰处理。滤波部分采用阈值法,较详细地探讨了阈值的选取规则;分峰部分利用样条卷积法,并给出了其算法公式,处理速度较快,算法也较简单。通过对模拟和实验信号的处理,发现该联用方法很有效,处理后的峰的峰位置误差≤3.0%,峰面积误差≤3.0%。  相似文献   

8.
以小波多分辨分析为理论基础,结合过程神经网络模型,建立了具有分层、多分辨和局部学习特性的多分辨小波过程神经网络.该网络充分利用小波函数和尺度函数互补的特性,以及过程神经网络可以处理连续输入信号的能力,能够很好地解决复杂的非线性时间序列的预测问题.给出了相应的学习算法,并以航空发动机排气温度裕度状态监视为例,利用多分辨小波过程神经网络进行预测.结果表明,多分辨小波过程神经网络收敛速度快、精度高.同时也为航空发动机排气温度裕度状态监视问题提供了一种有效的方法.  相似文献   

9.
根据时-频分辨特性的B样条双正交小波的选择   总被引:2,自引:0,他引:2  
该文简要地分析了在基于小波变换的图像和视频编码中小波基的选择对编码效率和编码质量的影响,从适于提取图像和视频信号高频成分的角主,提出了根据时-频分辨特性对B样条双正交小波进行选择的标准,给出了B样条小波的构造过程和计算时-频窗面积的方法,并对2≤N≤20的N阶B样条函数,得出了使其分析小波函数具有最优时-频分辨特性的条件,该条件表明:B样条函的阶数较低时,其分析波波函数的时-频分辨特性较好,并且N取偶数时的B样条双正交小波的时-频分辨特性要相对优于N取奇数时的B样条双正交小波的时-频分辨特性,据此条件,可以求出相应的对偶尺度函和小波函,最后,通过选用几个典型的双正交小波进行编码模拟实验,验证了得出的结论。  相似文献   

10.
朱晨超  王爱民  徐龙 《测控技术》2018,37(10):85-89
针对色谱分析中重叠峰的分解问题,提出一种基于双树复小波变换的色谱重叠峰分解方法。首先深入研究了双树复小波变换相较于离散小波变换的优越性;然后利用双树复小波变换分解与重构模拟色谱信号,计算分离度、峰位和峰面积,与离散小波变换的结果对比,并对噪声信号进行测试;最后利用双树复小波变换分解与重构实验所测得的色谱信号。实验结果表明,双树复小波分解色谱重叠峰比一般的实数小波准确,能够有效地分离重叠峰,分解后峰形平滑对称未发生畸变,峰位相对误差与峰面积相对误差较小,适合定性定量分析。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
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   

13.
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   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

18.
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.  相似文献   

19.
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   

20.
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   

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