单壁碳纳米管与稀土螯合物的磁性-荧光复合体系的制备及其多模成像应用研究

利用共价连结和非共价修饰相结合的方法,成功地制备了基于单壁碳纳米管与铕、钆螯合物的复合体系（SWNT—Eu—Gd）,并采用层层自组装的方法在单壁碳纳米管表面修饰多层高分子电解质作为隔离层,有效地克服了铕螯合物与单壁碳纳米管直接接触的荧光淬灭问题。SWNT—Eu—Gd复合体系除具有铕的特征荧光之外,还可以作为T1加权核磁共振造影剂,在纳米生物医学多模成像上具有潜在的应用。     

像面数字全息显微系统的成像分辨率及成像特点

为了实现高质量成像,通过对实际的像面数字全息显微系统(IPDHMS)点扩散函数的推导,分析了系统的成像分辨率决定因素及成像特点,给出了相应的实验结果。结果表明,IPDHMS的成像分辨率取决于显微物镜(MO)的成像分辨率和记录器件的像元大小,而与记录器件的光敏面尺寸无关;无论物体被照亮区域有多大,对全息图的记录和再现都没有影响;IPDHMS对成像区域中各点发出的通过MO的各种频率成分均能完整记录与再现,是一种优化的全息成像系统,利用该系统可以实现高质量成像与测量。实验结果证明了理论分析的正确性。     

Computer-aided manual work station as an extension of the product-independent flexible factory automation concept

This paper discusses the extension of a concept for product- and process-independent factory automation to include functions for the control and coordination of computer-aided manual work stations. Subsystems already implemented and standardised for factory-wide integration in all production processes have been taken into account. They represent components of the computer-integrated manufacturing factory of the future.     

像素全息谱的傅里叶变换全息图在防伪中的应用

提出从像素全息图中提取出它的阵列频谱进行重新编码，然后再进行傅里叶变换而得到具有体现效应的全息图像的新方法，并给出实验结果和在防伪应用实例。     

Finding Hidden Events in Astrophysical Data using PCA and Mixture of Gaussians Clustering

The Principal Component Analysis (PCA) is applied to a set of astronomic data to obtain a separation between variations of luminosity and noisy fluctuations. A clustering with the Mixture of Gaussians method, performed in the principal subspace, allows us to classify the data according to the features of interest. Our results are compared with those obtained by the AGAPE (Andromeda Galaxy and Amplified Pixels Experiment) collaboration. Received: 22 December 2000, Received in revised form: 26 March 2001, Accepted: 20 April 2001     

基于象素划分的两值线图图象的细化

两值图象的细化是图象分析的重要环节。本文提出一种基于象素划分的两值线图图象的细化算法。文中设计了三组模板用于两值线图图象的细化，对于细化中产生的多余分枝线，通过划分象素集合，按文中给出的搜索次序图进行搜索，根据对搜索结果判别以去除之，从而得到满意的细化结果。文中详细说明细化过程，并给出实验结果。该方法已在实际工作中得到运用。     

First results in micromapping the sensitivity to SEE of an electronic device in a SOI technology at the LNL IEEM

In this paper we review on radiation tolerance studies on a Monolithic Pixels Detector fabricated in a commercial Silicon On Insulator (SOI) technology and we report on the first application of Ion Electron Emission Microscopy to obtain a micrometric map of its sensitivity to Single Event Upset.     

Efficient visual object detection with spatially global Gaussian mixture models and uncertainties

In this paper, we deal with the problem of visual detection of moving objects using innovative Gaussian mixture models (GMM). The proposed method, the Spatially Global Gaussian Mixture Model (SGGMM) uses RGB and pixel uncertainty for background modelling. The SGGMM with colours only is used for scenes with moderate illumination changes. When combined with pixel uncertainty statistics, the method can deal efficiently with dynamic backgrounds and scene backgrounds with fast change in luminosity. Experimental evaluation in indoor and outdoor environments shows the performance of the foreground segmentation with the proposed SGGMM model using solely RGB colour or in combination with pixel uncertainties. These experimental scenarios take into account changes in the background within the scene. They are also used to compare the proposed technique with other state-of-the-art segmentation approaches in terms of accuracy and execution time performance. Further, our solution is implemented and tested in embedded camera sensor network nodes.     

Automated segmentation of optic disc region on retinal fundus photographs: Comparison of contour modeling and pixel classification methods

The automatic determination of the optic disc area in retinal fundus images can be useful for calculation of the cup-to-disc (CD) ratio in the glaucoma screening. We compared three different methods that employed active contour model (ACM), fuzzy c-mean (FCM) clustering, and artificial neural network (ANN) for the segmentation of the optic disc regions. The results of these methods were evaluated using new databases that included the images captured by different camera systems. The average measures of overlap between the disc regions determined by an ophthalmologist and by using the ACM (0.88 and 0.87 for two test datasets) and ANN (0.88 and 0.89) methods were slightly higher than that by using FCM (0.86 and 0.86) method. These results on the unknown datasets were comparable with those of the resubstitution test; this indicates the generalizability of these methods. The differences in the vertical diameters, which are often used for CD ratio calculation, determined by the proposed methods and based on the ophthalmologist's outlines were even smaller than those in the case of the measure of overlap. The proposed methods can be useful for automatic determination of CD ratios.