Starting with the materialisation of information organisation and knowledge organisation, the author proposes "knowledge space", a new conceptual basis for knowledge organisation. then, the atuthor studies"concept vectors"in knowledge field which can he represented in multidimensional spaces, personal“status vectors”based on these concepts,"representation vectors" of information items which may exist in retrieval systems including knowledge subspaces, "retrieval volume" of subspaces of users expanding or narrowing retrieval subspaces and implications of the new concept. 11 refs.
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Based on the concept of fuzzy random variable, the concept of convex sets of fuzzy random vectors is introduced, and some examples for such type of convex sets are given.
在模糊随机变量的基础上引入了模糊随机向量凸集的概念，给出了几个模糊随机凸集的例子。
Partial derivatives of eigenvalues and eigen vectors with respect to random variables for structures are deduced by means of the concept of mode truncation.
为求出随机特征对的方差，借助于模态截断概念推出诸特征值与特征向量对随机变量的偏导数。
This paper presents a new concept of linear dependent loop on the analysis of the linear relations of meter vectors to resolve the problems of power system observability systematically.
在分析测量向量间线性相关的基础上提出了线性相关环的概念；
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