%A Ye Chunlei, Leng Fuhai %T Study on the Keyword Extraction from Roadmap Based on the Lexical Chains %0 Journal Article %D 2013 %J Data Analysis and Knowledge Discovery %R 10.11925/infotech.1003-3513.2013.01.08 %P 50-56 %V 29 %N 1 %U {https://manu44.magtech.com.cn/Jwk_infotech_wk3/CN/abstract/article_3679.shtml} %8 2013-01-25 %X The paper proposes a method to extract the keyword based on the lexical chains. The method can describe the technical field topics in the technology roadmap by constructing lexical chains, and regard the lexical chains as semantic relations of keyword in the technical field. The experiment shows that this method can extract the keyword to reveal the content of technical field in technology roadmap more comprehensively, and can significantly improve the precision and recall rate than TF-IDF.