北仑峙南围垦沉滑原因及对策

介绍北仑区郭巨峙南围涂工程概况及地质条件。根据海堤原位观测结果,着重分析海堤滑动的原因,提出对沉滑加固处理和对堤脚外冲刷处理的措施。得出的经验教训是:建设、设计、施工等单位对软土地基筑堤的特性和规律应有一个共识,认识和掌握堤基强度随加荷逐渐变化的规律是在软土地基上筑堤的关键,切忌盲目加载和不按加荷次序施工。     

A technique for encoding lines and regions in engineering drawings

An improvement to a method of extracting line and region information from technical drawings is presented. A scheme for compressing this information as it is being found is also given. The encoding scheme is based on a combination of run-length codes, direction chain codes, and Huffman codes. It is efficient, requires minimal storage, and achieves favorable compression ratios. Experimental results from four typical line drawings are presented.     

Display of Fractal with Evolution

Based on the study of the process in which Sierpinski Gasket, a typical fractal, is constructed in 3D space, a new method of visualizing fractal is presented in this article. The image of the fractal is built in screen space, and, by utilizing existing techniques for visualizing traditional geometric objects, the real effectiveness of image can be obtained.     

迅速崛起的亚太光纤市场

本文归纳分析出亚太光纤市场的两个显著特点，介绍了亚太地区光通信发展水平，以及亚太各国和地区间的光通信合作，指出亚太光纤市场得以迅速发展的主要原因。     

Adaptive window-based tracking for the detection of membrane structures in kidney electron micrographs

An algorithm for the detection and measurement of the glomerular basement membrane in kidney electron micrographs by image analysis techniques is described. Starting from a user-specified point, local features within a small window are computed to give a feature score. Feature scores for adjacent neighbourhoods are also determined, and windows that satisfy similarity criteria are linked to produce the centerline of the membrane. A region-growing process completes the segmentation procedure. The adaptive and local nature of the algorithm ensures successful segmentation despite the complex and variable characteristics of the micrograph image.     

Gbit／s高速网络及其CRMA MAC协议

本文介绍了易于信元交换的ＡＴＭ技术和Ｂ－ＩＳＤＮ接轨的基于时间槽的Ｇｂｉｔ／ｓ高速网络及其ＭＡＣ协议ＣＲＭＡ，描述了ＣＲＭＡ传统模式，新的按节点划分区域时间槽重复使用的ＦＲ预约模式，进一步改善了网络性能。     

Parallel computers for region-level image processing

It is well known that parallel computers can be used very effectively for image processing at the pixel level, by assigning a processor to each pixel or block of pixels, and passing information as necessary between processors whose blocks are adjacent. This paper discusses the use of parallel computers for processing images at the region level, assigning a processor to each region and passing information between processors whose regions are related. The basic difference between the pixel and region levels is that the regions (e.g. obtained by segmenting the given image) and relationships differ from image to image, and even for a given image, they do not remain fixed during processing. Thus, one cannot use the standard type of cellular parallelism, in which the set of processors and interprocessor connections remain fixed, for processing at the region level. Reconfigurable cellular computers, in which the set of processors that each processor can communicate with can change during a computation, are more appropriate. A class of such computers is described, and general examples are given illustrating how such a computer could initially configure itself to represent a given decomposition of an image into regions, and dynamically reconfigure itself, in parallel, as regions merge or split.     

一种基于PSTN的新型语音保密系统

本文主要针对现有的PSTN语音保密系统的一些缺陷,提出了一种新型的结构方式,解决了pSTN语音系统中双方身份认证问题.在该系统中,引进了一种新型的管理机制--管理中心,以注册电话用户终端并下发公钥表;还引入了区间密钥,以方便灵活地划分通信的安全域.最后,本文对该系统的安全性能进行了分析.     

基于区域特征的步态识别研究

步态识别主要是以人走路的姿势来识别其身份。为了能准确快速地识别,本文依据步态的周期性,以一个步态序列中的6帧特殊图像来描述步态的变化,再提取步态髋关节以下部分作为研究对象,确定髋关节以下部分的质心,以质心为原点,建立坐标系。将髋关节以下的部分划分成36个小区域,以周期变化的区域面积作为特征,描述步态的周期变化。这样既可以较全面地描述一个步态的信息,又降低了维数,减小计算量。同时引入最近邻分类器进行分类。实验证明,该算法不仅能得到较好的识别率,并且计算速率快。     

AutoCAD中利用区域计算实现多边形的重叠与空洞检查

在AuotCAD中,利用多边形的区域计算功能,对宗地线、图斑线进行重叠与空洞检查,可大幅度提高宗地界、图斑界重叠与空洞检查的速度和质量,从而提高地籍成图的成图效率和成果质量。