HUKB at NTCIR-12 IMine-2 Task: Utilization of Query Analysis Results and Wikipedia Data for Subtopic Mining

Query understandings is a task to identify the important subtopics of a given query with vertical intent. In this task, characteristic keywords extracted from query analysis results and Wikipedia are used as candidates for the subtopics. From these candidates, topic-model based on the web documents retrieved by an original query is used for selecting appropriate subtopics, Vertical intent is judged mainly by the typical keyword list used for the particular vertical intent. For the Image, News and Shopping, the system checks type of retrieved documents that are estimated by using ALT value of IMG tag, anchor text and site list for URLs for vertical intent estimation.