Automatic patent document summarization for collaborative knowledge systems and services

Engineering and research teams often develop new products and technologies by referring to inventions described in patent databases. Efficient patent analysis builds R&D knowledge, reduces new product development time, increases market success, and reduces potential patent infringement. Thus, it is beneficial to automatically and systematically extract information from patent documents in order to improve knowledge sharing and collaboration among R&D team members. In this research, patents are summarized using a combined ontology based and TF-IDF concept clustering approach. The ontology captures the general knowledge and core meaning of patents in a given domain. Then, the proposed methodology extracts, clusters, and integrates the content of a patent to derive a summary and a cluster tree diagram of key terms. Patents from the International Patent Classification (IPC) codes B25C, B25D, B25F (categories for power hand tools) and B24B, C09G and H011 (categories for chemical mechanical polishing) are used as case studies to evaluate the compression ratio, retention ratio, and classification accuracy of the summarization results. The evaluation uses statistics to represent the summary generation and its compression ratio, the ontology based keyword extraction retention ratio, and the summary classification accuracy. The results show that the ontology based approach yields about the same compression ratio as previous non-ontology based research but yields on average an 11% improvement for the retention ratio and a 14% improvement for classification accuracy.     

自动文摘抽取的研究

本文详细介绍了自动文摘抽取的六种方法的基本原理,最后,在潜在语义索引模型选取法的基础上,提出了一种基于LSI语句聚类的语句选取方法     

反周期微分包含受控系统的最优控制

本文首先证明了Hilbert空间中一类微分包含的反周期解的存在唯一性,进而得到了相应的Langrange最优控制存在的充分条件。最后将得到的理论结果应用于证明一类非线性偏微分方程反周期问题及相应的最优控制问题的存在性。     

相对论性Birkhoff方程的几何理论

定义相对论性Pfaff作用量 ,给出相对论性Pfaff_Birkhoff原理和相对论性Birkhoff方程 ,研究相对论性Birkhoff方程的几何描述 ,给出相对论性Birkhoff方程的恰当特性以及相对论性Birkhoff方程在R×T M上的形式 .研究相对论性Birkhoff方程的全局处理 ,给出自治形式、半自治形式以及一般形式的相对论性Birkhoff方程的全局特性 ,并给出相对论性Birkhoff方程的能量变化的几何特性 .     

一类具逐段常变量泛函微分方程的解的全局吸引性及其应用

研究逐段常变量泛函微分方程运用一种新方法获得了保证方程每一解趋干0的一族充分条件.又将所得结果应用于红血球生长模型,所得推论改进了已有结果.     

线性微分方程幂级数解的收敛半径

给出微分方程Ｙ″＋Ｐ（ｘ）ｙ′＋Ｑ（ｘ）ｙ＝０的幂级数解ｙ＝∑ｎ＝０＾∞ａｎ（ｘ－ｘ０）＾ｎ其系数满足二项递推公式ａｎ＋ｐ＝ｆ（ｎ）ａｎ的收敛半径的求法。     

Stability and Instability of Solution for a Class of Nonlinear Differential Equations

1　ＩｎｔｒｏｄｕｃｔｉｏｎＩｎＲｅｆ.〔1〕 ｔｈｅａｓｙｍｐｔｏｔｉｃｓｔａｂｉｌｉｔｙｏｆｎｏｎｌｉｎｅａｒｓｌｏｗｌｙｃｈａｎｇｉｎｇｓｙｓｔｅｍｈａｓｂｅｅｎｄｉｓｃｕｓｓｅｄ .ＩｎＲｅｆ.〔2〕ｔｈｅｉｎｓｔａｂｉｌｉｔｙｏｆｓｏｌｕｔｉｏｎｆｏｒｔｈｅｔｈｉｒｄｏｒｄｅｒｌｉｎｅａｒｄｉｆ ｆｅｒｅｎｔｉａｌｅｑｕａｔｉｏｎｗｉｔｈｖａｒｉｅｄｃｏｅｆｆｉｃｉｅｎｔｈａｓｂｅｅｎｄｉｓ ｃｕｓｓｅｄ .Ｉｎｔｈｉｓｐａｐｅｒ,ｗｅｈａｖｅｄｉｓｃｕｓｓｅｄｓｔａｂｌｉｌｉｔｙａｎｄｉｎｓｔａ…     

外语课堂教学环境下词汇能力的培养和发展

我国外语课堂教学环境下学生词汇知识和词汇能力的发展不均衡 :一方面 ,语言水平的提高基本不伴随着词汇知识深度的发展 ;另一方面 ,接受性能力的发展总是先于产出性能力。采用高意识控制 ,建立语义网络 ,发展词汇综合运用能力 ,有利于促进两种词汇能力的协调发展     

On the Collision Detection Problem of Two Moving Objects Described by Algebraic Sets

In this paper, the collision problem of two moving objects is investigated. The objects are described by two algebraic sets （ellipses or circles in the paper）. The collision problem discussed involves both static and dynamic case. The static case is that each object moves with known velocity. We use nonlinear programming to decide whether the objects collide. The dynamic case is that each object is controlled by a constraint external force which can be regulated online. For the dynamic case, the collision problem can be modelled as a Minmax problem which can be solved by using differential games. If collision occurs, the time and place of the first collision are given. The moving trajectories are provided in the paper.     

一类高阶微分方程组的非允许解

利用亚纯函数的Nevanlinna值分布理论及反证法,讨论了一类高阶复微分方程组非允许解的存在性问题,给出这类方程组存在非允许解的条件,并通过例子说明这一结果的可行性.