NTCIR-5 Patent Retrieval Experiments at Hitachi

NTCIR-6 Patent Retrieval Experiments at Hitachi

POSTECH at NTCIR-5 Patent Retrieval: Smoothing Experiments in a Language Modeling Approach to Patent Retrieval

This report describes the experimental results of our participation at the Document Retrieval Subtask of NTCIR-5 Patent Retrieval Task. Unlike newspaper articles which belong to the main document type handled in previous information retrieval experiments, patent documents have many different characteristics in terms of length, technicality, structureness, etc. Among these, we focus on the lengt...

Experiments on Cross-language and Patent Retrieval at NTCIR-3 Workshop

The Berkeley group participated in the crosslanguage retrieval task and the patent retrieval task at the third NTCIR workshop. This paper describes our experiments on cross-language and patent retrieval. We present an automatic relevance feedback procedure for document ranking formula based on logistic regression, and a procedure for automatically extracting Chinese/Japanese translations of Eng...

Overview of Patent Retrieval Task at NTCIR-5

In the Fifth NTCIR Workshop, we organized the Patent Retrieval Task and performed three subtasks; Document Retrieval, Passage Retrieval, and Classification. This paper describes the Document Retrieval Subtask and Passage Retrieval Subtask, both of which were intended for patent-to-patent invalidity search task. We show the evaluation results of the groups participating in those subtasks.

NTCIR-7 Patent Mining Experiments at Hitachi

This paper reports results of our experiments on the automatic assignment of patent classification to research paper abstracts. We applied K-Nearest Neighbors Methods and three kinds of query term expansion methods using a research paper abstract dataset and a patent document dataset to improve the classification accuracy. The results show that these query expansion methods slightly improve cla...