叙词标引中切题性的思考与处理

叙词法是以经规范化处理后的叙词作为文献标引识的一种文献处理方法。七十年代以后,随着各专业叙词表的问世,以及计算机在文献存储、检索系统的应用,叙词法作为文献标引的一种方法已愈来愈广泛的得到推广和应用。叙词法和分类法不同,叙词法不是从文献资料内容的学科性质着眼,而是以规范化词语为基础,运用叙词以及相关语的语义关系来表达文献资料的主题内容。因此,叙词法在揭示文献资料内容方面比现行分类法更为先进。又由于叙词法是通过叙词组配实现文献标引,因此,

大学生抽象思维特点比较研究——基于英语与法学专业学生议论文写作切题性因子分析

本研究根据"柯而特"PMI思维理论,制定议论文切题性评分因子,并据此分别从概念明确性、判断适切性和推理论证完备性三方面对英语和法学专业学生汉语议论文的切题性进行定量分析,比较大学生抽象思维的学科差异,破解英语专业学生"思维缺席症"的现状和原因,为英语专业教学提供一定建议。

现代情报检索理论特性述略

本文总结了现代情报检索理论的四个基本概念：相关性、切题性、模糊性和哲学性．

切题知识原则简论(英文)

本文第一部分简论知识的切题性及语境、总体性属性、多维度属性与复杂性等影响认知的因素;第二部分简论一般性智能及二十世纪高等教育中学科专业化对切题性知识的肢解;第三部分分析二十世纪(高等)教育中影响切题知识获取的三个基本问题:知识分割与封闭式专业化、还原与分离、虚假合理性。

期刊的评价问题

本文讨论了鉴別某种期刊对特定图书馆是否有用的标准,主要考虑的因素是学科的切题性、利用率、一般可获得性、可参照性(标引范围)、价格、著录格式、出版者的信誉及引用率.根据特定图书馆的需要,

Multivariate Vector Valued Salzer's Theorem

In this paper, the important Salzer's theorem for rational interpolation is generalized to the multivariate vector valued case.

Benefits of redundant channels in observer-based H∞ control for discrete-time switched linear systems

In this paper, the H∞ control problem is investigated for a class of discrete-time switched linear systems with modal persistent dwell-time(MPDT) switching. The redundant channels are considered to use in the data transmission to benefit the capability of overcoming the fragility of networks commonly configured by a single channel in the communication networks subject to random packet losses. In light of a new class of Lyapunov functions, the desired observer-based quasi-time-dependent controllers, which have less conservatism than the time-independent ones, are designed such that the resulting closed-loop system is exponentially mean-square stable with a guaranteed H_∞ disturbance attenuation performance. The MPDT can be minimized while ensuring the existence of such a class of observer-based controllers for a given period of persistence. An example of DC-DC boost converter is provided to verify the effectiveness of theoretical findings.