Comprehensive, in-depth and accurate analyses of patent technology topic evolutions become increasingly significant since the analytical results can offer related personnel the scientific support to explore or trace back to the origin and the development of the technology. However, existing methods of topic evolutions do not facilitate better understanding of how a technology topic has evolved. This paper introduces an integrated method with the LDA topic identification analysis, the improved topic life cycle analysis, and the improved technology entropy analysis for identifying, measuring and interpreting topics evolutions from patent literatures. Multiple indicators we proposed and improved have been used to measure the degree of topic development and identify the topic types of different states. And, the concept of technology entropy has been redefined and improved to measure the changes of evolution intensity and evolution direction among topics, mainly used the topic word and its probability. The results from different methods are mutually connected and complemented. The process and characteristics of topic evolution are further overviewed. Graphene is selected for the case study. The mechanism of evolution and the effect of improved methods are focused on. The research has clearly shown that more accurate and comprehensive results can be achieved for topic evolution by employing this integrated method. Furthermore, the above integration of methods has potential contributions to hot spot detection and potential technology discovery.

对专利技术主题演变的全面、深入、准确的分析变得越来越重要，分析结果可以为相关人员探索或追溯技术的起源和发展提供科学支持。然而，现有的主题演变方法并不能促进更好地理解技术主题是如何演变的。本文介绍了一种与LDA主题识别分析、改进的主题生命周期分析和改进的技术熵分析相结合的方法，用于从专利文献中识别、测量和解释主题演变。我们提出并改进了多个指标，用于衡量话题发展程度，识别不同状态的话题类型。和，对技术熵的概念进行了重新定义和改进，以衡量主题间演化强度和演化方向的变化，主要使用主题词及其概率。不同方法的结果是相互联系和补充的。进一步概述了主题演化的过程和特征。案例研究选择了石墨烯。重点介绍了进化机制和改进方法的效果。研究清楚地表明，采用这种集成方法可以实现更准确、更全面的主题演化结果。此外，上述方法的集成对热点检测和潜在的技术发现具有潜在的贡献。主要使用主题词及其概率。不同方法的结果是相互联系和补充的。进一步概述了主题演化的过程和特征。案例研究选择了石墨烯。重点介绍了进化机制和改进方法的效果。研究清楚地表明，采用这种集成方法可以实现更准确、更全面的主题演化结果。此外，上述方法的集成对热点检测和潜在的技术发现具有潜在的贡献。主要使用主题词及其概率。不同方法的结果是相互联系和补充的。进一步概述了主题演化的过程和特征。案例研究选择了石墨烯。重点介绍了进化机制和改进方法的效果。研究清楚地表明，采用这种集成方法可以实现更准确、更全面的主题演化结果。此外，上述方法的集成对热点检测和潜在的技术发现具有潜在的贡献。重点介绍了进化机制和改进方法的效果。研究清楚地表明，采用这种集成方法可以实现更准确、更全面的主题演化结果。此外，上述方法的集成对热点检测和潜在的技术发现具有潜在的贡献。重点介绍了进化机制和改进方法的效果。研究清楚地表明，采用这种集成方法可以实现更准确、更全面的主题演化结果。此外，上述方法的集成对热点检测和潜在的技术发现具有潜在的贡献。