Δ-distance: A family of dissimilarity metrics between images represented by multi-level feature vectors

This article presents the Δ-distance, a family of distances between images recursively decomposed into segments and represented by multi-level feature vectors. Such a structure is a quad, a quin or a nona-tree resulting from a fixed and arbitrary image partition or from an image segmentation process. It handles positional information of image features (e.g. color, texture or shape). Δ-distance is the generalized form of dissimilarity measures between multi-level feature vectors. Using different weights on tree nodes and different distances between nodes, distances between trees or visual similarity between images can be computed based on the general definition of Δ. In this article, we present three Δ-based distance families: two families of distances between tree structures, called -distance( for Tree) and -distance ( for Segment), and a family of visual distances between images, called ( for Visual). The -distance visually compares two images using their tree representation and the other two distances compare the tree structures resulting from image segmentation. Moreover, we show how existing distances between multi-level feature vectors appear to be particular cases of the Δ-distance     

近四年我国竞争情报的研究热点及现状分析

文章通过选取收录在中文期刊全文数据库近四年全部期刊作为切入点,以关键词为研究对象,采用词频统计和内容分析法,利用EXCEL为数据统计工具对竞争情报研究领域的主要研究方向进行关键词的变化状况研究和现状分析,从关键词的角度对竞争情报研究中的领域及其热点进行了探讨及分析。参考文献8。     

电视的本质及其双重身份的辨析

电视在当下的身份乃是技术身份和人文身份的结合。这种双重身份在给电视带来实践中的尴尬的同时,其持续的博弈也为电视传播的未来指明了菜种可遵循的路径。电视传播在未来的创新将在这种动态矛盾的平衡中产生。     

公共图书馆网建设要实行规范化管理

论文针对公共图书馆“分馆”建设热潮,从坚持公共图书馆的职能定位、根据国情推行公共图书馆总／分馆制、厘清“流动图书馆”本义三个方面,论述了实行规范化管理以确保公共图书馆网建设可持续发展的必要性。     

流媒体国际标准化DRM技术动态综述

DRM既是内容流通领域的重要技术,也是确保同时满足内容的创作者、提供商、用户等不同角色需求这一复杂流通环境的必要技术。DRM的应用会部分妨碍用户获取内容,但因不当拷贝内容的事件持续发生,提供商针对各种问题被迫实施DRM强化技术。文章首先介绍早期的DRM;通过DVD应用案例概述DRM技术;阐述快速普及的手机移动设备的DRM标准,NpOMADRM;在存储介质的DRM方面,以SD卡为例介绍CPRM技术;有关DEM国际标准化活动,以MPED--21为中心案例,解说IPMP技术;在事实标准化活动案例中,列举业界主导型DRM,即Coral,给出其要点;最后,总结DRM的现状和未来。     

主题图的概况及应用研究（上篇）

在语义Web时代,主题图（TopicMaps,文章简称TM）被认为是实用性较高的知识组织技术。本研究以TM技术的应用为最终目标,分上、下两篇整体地论述TM的相关研发工作。本篇中给出TM的概况,包括TM的概念、标准体系、应用领域、开发工具和相关网站等,为进行具体领域的应用开发奠定了基础;在另一篇中,将结合金融培训机构知识体系,介绍如何应用TM技术来组织行业知识,包括基于TM技术的金融培训机构知识系统的架构设计和实现。最后,给出本研究对未来的展望及结论。     

复杂网络软件分析与评价

如今,复杂网络数据规模膨胀,文字和表格已无法展现其内部结构,同时妨碍了复杂网络隐藏信息的挖掘,复杂网络分析工具的产生解决了上述难题。文章归纳总结了复杂网络理论的基本内容,在广泛调查现有复杂网络处理软件的基础上,分析比较了各个软件的功能,提出量化评价指标,并对各个软件进行分析评价。     

风险的呈现及其隐匿——从“太湖水污染”报道看环境风险的媒体建构

本文以媒体建构论为理论框架,对六家报纸2007年太湖水污染报道进行内容分析,从消息来源、报道主题、风险归因方式及报道立场等方面考察媒体如何报道与呈现相关环境风险。研究发现,不同类型媒体在消息来源与风险归因方式上不存在显著差异,均高度依赖政府信源,存在简单化归因倾向;但在报道主题和报道立场上存在显著差异,当地媒体在政府主导型的报道框架下表现出明显的负面新闻正面报道的宣传逻辑。     

Independent force and position control for cooperating manipulators

The problem of independent force and position control of multitask cooperating manipulators is studied. Each manipulator is in a non-singular configuration and the object can be driven by the contact forces exerted by the end effectors of the manipulators. The design requirement is to control each coordinate of the position of the object as well as each component of the “rest” forces, except the moving forces that are determined uniquely from the object's position. The present design requirement has been proved to be always satisfied together with asymptotic and BIBO stability. A class of controllers solving the above simultaneous problem is analytically determined. The proposed state feedback controller does not depend upon the specific object dynamics and thus the resulting closed-loop multimanipulator system performs as required, not only when handling various objects but also when the dynamics of the objects are unknown or hard to compute or disturbed by external forces.