Korean Documents Copy Detection Based on Ferret

Byung Ryul Ahn, Won-gyum Kim, Won Young Yu, Moon-Hyun Kim

Abstract: With the development of electronic documents, plagiarism is rapidly increasing and, given the difficulty of manual detection, need for plagiarism detection systems to help protect intellectual property has emerged. Many content-based detection systems have been developed and are actually used in some foreign countries, but they are still insufficient for documents in Korean. In particular, the high variance of Hangul makes the development of detection systems more difficult. This study proposes a Hangul document detection method based on Ferret’s trigrams. Ferret only considered the frequency of trigram matches as a way to detect similarity, but in this study the system is developed further by weighting results depending on the degree of trigram match, thereby improving the accuracy of similarity detection.