We present an effective multifaceted system for exploratory analysis of
highly heterogeneous document collections. Our system is based on intelligently
tagging individual documents in a purely automated fashion and exploiting these
tags in a powerful faceted browsing framework. Tagging strategies employed
include both unsupervised and supervised approaches based on machine learning
and natural language processing. As one of our key tagging strategies, we
introduce the KERA algorithm (Keyword Extraction for Reports and Articles).
KERA extracts topic-representative terms from individual documents in a purely
unsupervised fashion and is revealed to be significantly more effective than
state-of-the-art methods. Finally, we evaluate our system in its ability to
help users locate documents pertaining to military critical technologies buried
deep in a large heterogeneous sea of information.

使用智能标记、基于机器学习和自然语言处理的 unsupervised 和 supervised 的标记策略，以及强大的 faceted 浏览框架，为高度异构文档集合提供了一种有效的多方面系统，其中重要的标记策略之一是 KERA 算法，如果让用户进行 buried 在海量不同信息中的军事关键技术文档定位，证明我们的系统是有效的。