Recommender System / 推薦システム

Recommender systems are implemented to many EC (Electronic Commerce) sites. Among all of you, I wonder if there are many people who have experienced to buy a recommended product shown in the product page. We interest to develop and apply recommender systems. Especially, based on machine learning and computational intelligence, we research and develop collaborative filtering based recommender systems which recommend products by using purchase history, evaluations to products, and so on.