锥栗无性系多性状综合选择的研究

采用主成份回归分析对锥粟１６个无性系的丰产性、稳产性、速生性、抗性以及果实大小等性状，进行了定量的综合评价．对无性系各性状的观测数据作线性正交变换，使它们转变成为一组互不相关的特征性状，彼此独立地参入综合评价，提高了综合选择的准确性，筛选出了综合性状优秀的Ⅰ类无性系Ｃ－０９，其平均单株产量达５．９０ｋｇ；选出了性状优良的Ⅱ类无性系Ｃ－０７，Ｃ－０６，Ｃ－１０，其平均单株产量４．７２ｋｇ．优选无性系的平均单株产量遗传增益为３１．５３％，果实增大６７．９９％．     

手持GPS坐标系统转换的方法研究

手持GPS使用的坐标系统默认是WGS-84坐标系统,以经纬度值显示,但在北京城市园林科研中所使用的遥感影像资料绝大部分都属于北京地方坐标系,以直角坐标值显示,为了解决课题研究过程中两个不同坐标系下的数据集成问题,对坐标系统转换的数值方法进行了研究和实例验证,从而为不同坐标系之间快速变换提供了方法参考。     

Binary Images Processing Based on Adaptation to Mixture Transform Coding

To enhance quality of image processing, it is demanded that coding algorithm should be simplified and the speed of image processing should be faster,and information loss on image compressed should be minimum.Adaptive segmentation is given for image which to be processed.Region coding is combined with threshold coding.Adaptation to mixture transform coding is fulfilled.Results of simulation shows that with this method coding loss witch images are compressed is mined and quantity of image processing is good.     

Virtual Signal Analyzer Based on Hilbert-Huang Transform

Hilbert-Huang transform(HHT) is a new method for signal analysis developed by Norden.E.Huang et al in 1998.The concepts for main contents,Empirical mode decomposition,Hilbert spectrum and marginal spectrum of Hilbert-Huang transform(HHT) are introduced.Based on the characteristics of VI's development and application,combining software and hardware,the designed method,which includes hardware,software and panel for the Virtual Signal Analyzer Based on Hilbert-Huang Transform are introduced.Based on the HHT,combined with virtual instrument technology,a Virtual Signal Analyzer is developed successfully.It has provided a new method for signal test and analysis.     

A Vector Quantification Image Coding Scheme Based on Wavelet Transform

The paper proposes an image compression and coding scheme based on discrete wavelet transform (DWT), which makes the best of the relativities among original image and coefficients of wavelet, the relativities among pixels of subimages, the relativities among directions of subimages. Human visual specialities were considered, so the compression scheme leads up to make full use of the statistical redundancy and visual redundancy of image. To get high compression ratio and good quality of image, the coefficients of image working on the quality of image greatly were reserved accurately, but the coefficients of image working on the quality of image slightly were quantified roughly. Also, the regrouping and coding of the coefficients could be used universally. The experimental results show that the compression method is provided with simply calculating, little time for coding and decoding and satisfying quality companied with high compression ratio.     

Profile Characteristics Analysis Using Kauhunen-Loeve Transform

The analysis method for profile characteristics based on Kauhunen Loeve transform is presented. The profile characteristics are represented using eigenvalues and eigenvectors, thus the error surface profile can easily be reconstructed. The main eigenvectors can be used to monitor and predict the surface error. Examples show that this method is feasible and very effective.     

Study on the Development of Wavelet Theory by Analysing References of Wavelet

By CD ROM and Internet Service System,lots of references on wavelet are searched.These references are analysed in the paper,a new viewpoint is put forward by the authors.Recent studies by the authors on wavelets are also introduced.     

Wavelet Analysis in the Signal Processing

The conceptions of mother wavelet and complete wavelet system are introtuced.Their digital features are described in detail.The definitions of con ti n nons, discrete, and dyadic discrete wavelet transforms are given,and their inverse transforms are deduced with reference to thevector expressions in R2 space.