面向中文专利文献的单层并列结构识别

结合条件随机场与伯克利句法分析器对中文专利文献中的单层并列结构进行识别。在经过分词和词性标注的中文专利语料的基础上,分别运用条件随机场和伯克利句法分析器对专利语料中的单层并列结构进行识别,提取两种机器模型相同的和识别结果中满足相应规则的并列结构识别结果。实验结果表明,该方法有效的识别了专利文献中的单层并列结构,取得了73.09%的F值。     

A de-texturing and spatially constrained K-means approach for image segmentation

This paper presents a new and simple segmentation method based on the K-means clustering procedure and a two-step process. The first step relies on an original de-texturing procedure which aims at converting the input natural textured color image into a color image, without texture, that will be easier to segment. Once, this de-textured (color) image is estimated, a final segmentation is achieved by a spatially-constrained K-means segmentation. These spatial constraints help the iterative K-means labeling process to succeed in finding an accurate segmentation by taking into account the inherent spatial relationships and the presence of pre-estimated homogeneous textural regions in the input image. This procedure has been successfully applied on the Berkeley image database. The experiments reported in this paper demonstrate that the proposed method is efficient (in terms of visual evaluation and quantitative performance measures) and performs competitively compared to the best existing state-of-the-art segmentation methods recently proposed in the literature.     

Global Village Media: Coming Together in the Early 1970s at Whiz Bang Quick City

Felicity D Scott , Associate Professor of Architecture at Columbia University Graduate School of Architecture, Planning and Preservation (GSAPP), describes here the instant city events of the early 1970s. These foreshadowed current global village media practices in what now seems a quaintly material manner: communication between sites involved the physical mailing of videotapes and ‘wire photos’ through the postal service. The sites themselves – in the US and elsewhere – were transformed into ‘instant cities’ through the erection of physical geodesic domes, teepees and inflatables in seas of mud. The true antecedents of today's instant networking, these pioneers embraced the newest technology available at the time and the most innovative forms of temporary architecture.     

“信号与系统的结构与解释”课程的教学体会

＂信号与系统的结构与解释＂作为＂信号与系统＂和＂数字信号处理＂课程之间的桥梁,是美国加州大学伯克利分校近几年开设的一门新课程。本文较系统地介绍了该课程的讲授内容和考核题目的形式,以及在我校开设选修课的体会。最后,给出对学生的无记名调查问卷内容和统计分析。     

基于VxWorks的嵌入式数据库工程实现与应用

随着嵌入式系统的应用越来越广泛,嵌入式系统存储和处理的数据量不断增加,数据安全性和可靠性成为嵌入式系统设计阶段需要考虑的重要因素之一。介绍了伯克利数据库(Berkeley DB)的基本原理,并给出了基于Vx-Works系统的Berkeley DB的应用方法,最后通过一个设计实例,对比了传统文件操作和数据库操作在存储空间和读写时间上的性能比较。     

基于BDB的XML检索引擎算法设计与实现

XML作为互联网数据交换及数据表现的标准,其重要性日益凸显,如何从大量的XML中挖掘有效信息已成为目前亟待解决的问题。设计并实现一个基于BDB的XML检索引擎算法XObject,通过构造关键词结构查询路径、进行结构聚类,并最终在BDBXML执行Xquery查询实现本地XML的关键字检索,从而解决XML信息挖掘中的关键技术课题——xML信息检索。     

Sequence of the most informative joints (SMIJ): A new representation for human skeletal action recognition

Much of the existing work on action recognition combines simple features with complex classifiers or models to represent an action. Parameters of such models usually do not have any physical meaning nor do they provide any qualitative insight relating the action to the actual motion of the body or its parts. In this paper, we propose a new representation of human actions called sequence of the most informative joints (SMIJ), which is extremely easy to interpret. At each time instant, we automatically select a few skeletal joints that are deemed to be the most informative for performing the current action based on highly interpretable measures such as the mean or variance of joint angle trajectories. We then represent the action as a sequence of these most informative joints. Experiments on multiple databases show that the SMIJ representation is discriminative for human action recognition and performs better than several state-of-the-art algorithms.     

Using a Water Balance to Determine the Source of Water in the Flooding Underground Mine Workings of Butte

Abstract.  Nearly 10,000 miles (16,000 km) of underground mine workings began flooding on April 22, 1982 when the large pumps used to dewater the mines of Butte, Montana were shut off. In the first few months, water levels in the workings rose hundreds of meters. Flooding continues to this day at a slower rate, nearly 25 years later. An early evaluation of the water chemistry in the flooding mines suggested that the initially poor water quality was the result of flushing of a reservoir of stored acidity and metals. However, a detailed water balance for the Berkeley pit, underground workings, and associated mining features suggests an alternative explanation. During the early period of mine flooding, acidic surface water from the deactivated heap leach operations and nearby acid rock drainage were routed into the empty Berkeley Pit, and thence drained downward and outward into the underground mine workings, causing widespread degradation of water quality in the underlying workings. After 21 months, the hydraulic gradients in the system reversed, causing a change in the direction of ground water flow and a gradual improvement in water quality of the mine shafts.     

嵌入式环境下CGI程序的Session实现方案

该论文分析了CGI程序缺陷,并使用数据库系统完成嵌入式环境下基于C语言的CGI程序的Session功能,克服了ASP、JSP的SESSION对象很容易被渗透入侵的缺点。该方案在某视频监控报警系统的开发应用中得到实现,解决了当前嵌入式WEB开发中存在的问题。     

嵌入式数据库典型技术SQLite和Berkeley DB的研究

与常见的数据库相比,嵌入式数据库具有体积小、功能齐备、可移植性、健壮性等特点,本文分析和比较了典型的嵌入式数据库SQLite和BerkeleyDB。首先从体系结构、子系统间调用关系、任务执行过程等角度对SQLite和BerkeleyDB进行了详细分析,然后重点从数据类型、存储方式、模式、数据库引擎和错误处理及加密功能等方面讨论了SQLite和BerkeleyDB的异同点,最后列举了一个基于ARM—Linux的SQLite应用实例。