Information filtering and information retrieval

摘要: Information filtering systems are designed for unstructured or semistructured data, as opposed to database applications, which use very structured data. The also deal primarily with textual information, but they may entail images, voice, video other data types that part of multimedia information systems. involve a large amount and streams incoming whether broadcast from remote source sent directly by sources. Filtering is based on descriptions individual group preferences, profiles, typically represent long-term interests. implies removal an stream rather than finding in the stream; users see only extracted. Models retrieval filtering, lessons research presented.