10 resultados para art of conversation

em Chinese Academy of Sciences Institutional Repositories Grid Portal


Relevância:

90.00% 90.00%

Publicador:

Resumo:

Traditional Chinese medicines (TCMs), due to their long time clinic test and reliable therapeutic efficacy, are attracting increased global attention served as excellent pools of bioactive compounds for the discovery of new drugs. However, hundreds or even thousands of components are usually contained in traditional Chinese medicines and only a few compounds are responsible for the pharmaceutical and/or toxic effects. The large numbers of other components in traditional Chinese medicines make the screening and analysis of the bioactive components extremely difficult. By the way, the combination effect of bioactive components on the pharmacological activity makes it very difficult to clear the therapeutic mechanism of TCMs. Therefore, some strategies have to design for screening of bioactive compounds in traditional Chinese medicines, which further leads to disclose the therapeutic mechanism of TCMs in molecular level. The review will summarize the present state of the art of screening strategy for active compounds in traditional Chinese medicines, and the chromatography methods for screening and analysis of bioactive compounds in traditional Chinese medicines will be emphasized. (C) 2004 Elsevier B.V. All rights reserved.

Relevância:

90.00% 90.00%

Publicador:

Resumo:

This article presents the state of the art of analytical applications of the electrochemiluminescence (ECL) of tris (2,2'-bipyridyl) ruthenium (Ru(bpy)(3)(2+)) and its derivatives. in the last seven years, Ru(bpy)(3)(2+) ECL has attracted much interest from analysts and been successfully exploited as a detector of flow injection analysis (FIA), high-performance liquid chromatography (HPLC), capillary electrophoresis (CE), and micro total analysis systems (TAS). Immobilization of Ru(bPY)(3)(2+) on a solid surface provides several advantages over the solution-phase ECL procedure, such as the simplicity of experimental design and cost-effectiveness. After a brief discussion of the mechanism of Ru(bpy)(3)(2+) ECL, we discuss its applications in FIA, HPLC, CE and TAS and give special attention to the design of Ru(bpy)(3)(2+) ECL cells and some immobilization techniques of Ru(bpy)(3)(2+); we focus on papers published after 1997.

Relevância:

80.00% 80.00%

Publicador:

Resumo:

分组密码工作模式是利用分组密码解决实际问题的密码方案.好的工作模式可以弥补分组密码的某些缺憾;相反,不好的工作模式可能带来安全隐患.工作模式的研究始终伴随着分组密码的研究历史,新的分组密码标准的推出,都会伴随着相应工作模式的研究.从针对DES的ECB、CBC、CFB和OFB,到针对AES的CTR、CCM、CMAC、GCM和AESKW,作者以各种模式标准为主线,介绍分组密码工作模式的设计理念、安全模型、二十多年的研究成果以及发展现状.

Relevância:

80.00% 80.00%

Publicador:

Resumo:

不可能差分分析作为差分分析的一种变体,是一种简单有效的密码分析方法,也是目前最常用的密码分析方法之一.该方法一经提出就得到了广泛应用,被用于分析大量的算法和密码结构.尤其是近年来对AES的攻击,得到了一系列非常好的攻击结果,使得不可能差分分析已成为对AES最有效的攻击方法之一.系统介绍了不可能差分分析的原理、常用技巧和攻击方法,并总结了目前的研究现状和已取得的攻击结果.最后,分析了不可能差分攻击的优缺点及其在设计和分析分组密码方面的作用.

Relevância:

80.00% 80.00%

Publicador:

Resumo:

基因表达数据的爆炸性增长迫切需求自动、有效的数据分析工具.目前聚类分析己成为分析基因表达数据获取生物学信息的有力工具.为了更好地挖掘基因表达数据,近年来提出了许多改进的传统聚类算法和新聚类算法.本文首先简单介绍了基因表达数据的获取和表示,之后系统地介绍了近年来应用在基因表达数据分析中的聚类算法.根据聚类目标的不同将算法分为基于基因的聚类、基于样本的聚类和两路聚类,并对每类算法介绍了其生物学的含义及其难点,详细讨论了各种算法的基本原理及优缺点.最后总结了当前的基因表达数据的聚类分析方法,并对发展趋势作了进一步的展望.

Relevância:

80.00% 80.00%

Publicador:

Resumo:

综述了国内外基于手势输入构造三维概念模型的最新研究进展,讨论分析了手势交互过程及其关键技术:手势设计、手势识别、手势交互的层次结构以及手势交互的三维实现·最后对今后的发展方向进行了展望·

Relevância:

80.00% 80.00%

Publicador:

Resumo:

文中阐述了超精密加工技术的发展现状及实现方法。通过介绍微机器人技术在超精密加工中的具体应用,论证了微机器人技术在超精密加工及精密工程中的应用价值。

Relevância:

80.00% 80.00%

Publicador:

Resumo:

论述并联机床的发展现状及与传统机床的区别。在对国内外典型并联机床样机的工作原理分析的基础上,指出目前并联机床研究中所面临的主要问题,并对并联机床的研究发展方向进行了展望。

Relevância:

80.00% 80.00%

Publicador:

Resumo:

系统的决策控制活动依赖于系统内部的控制结构,制造系统的控制结构是先进制造与自动化领域的重要研究课题。制造系统的控制结构与计算机技术、生产设备自动化水平及制造模式等因素有关。早期的制造系统采用集中控制结构,而柔性制造系统和计算机集成制造系统多采用递阶控制结构。目前制造业已进入一个新时代,传统生产模式和企业结构无法适应不可预测的激烈的环境变化。因此,未来制造系统需要具备快速变化能力的动态控制结构

Relevância:

80.00% 80.00%

Publicador:

Resumo:

随着机器人向系统应用的方向发展,提出了由多机器人构成的群体或社会的组织与控制问题.多机器人协作问题已成为机器人学研究领域的热点之一.其中基于分布式人工智能中多智能体系统理论,研究多机器人协作问题正受到普遍关注.本文对协作机器人学的研究现状进行了综述,并展望了其未来的发展。