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NTIS 바로가기Journal of information technology applications & management = 한국데이타베이스학회지, v.24 no.1, 2017년, pp.169 - 185
노희룡 (Graduate School of Business IT, Kookmin University) , 안현철 (Graduate School of Business IT, Kookmin University)
This study proposes a novel recommendation algorithm that reflects the results from trust/distrust network analysis as a solution to enhance prediction accuracy of recommender systems. The recommendation algorithm of our study is based on memory-based collaborative filtering (CF), which is the most ...
핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
협업필터링 기법은 어떻게 분류할 수 있는가? | 협업필터링(CF) 기법은 크게 메모리 기반, 모델기반, 하이브리드 CF로 분류할 수 있다[Adomavicious and Tuzhilin, 2005]. 메모리 기반 CF는 사용자 혹은 상품 간 유사도를 측정하고 이를 기반으로 추천하는 방식으로, 이 때 유사도를 평가하기 위한 지표로는 피어슨 상관계수(Pearson correlation coefficient)나 코사인 벡터(cosine vector)가 널리 활용되고 있다. | |
모델 기반 CF의 단점은 무엇인가? | 이 방식은 베이지안 네트워크(bayesian network)나 군집분석(clustering) 등을 통해 사용자-상품 점수행렬을 기반으로 사용자 등급을 설명하는 모형을 개발, 학습하는데, 모델 학습 시 많은 연산량과 시간이 소요되나, 그 다음 적용 시에는 시간과 연산량이 크게 단축되는 장점이 있다. 다만,추천 정확도가 메모리 기반 접근법에 비해 다소 떨어질 수 있고, 사용자들의 선호가 빠르거나 잦은 갱신 환경에 적합하지 않은 단점이 있다. 하지만 일반적으로 내용 기반 추천 알고리즘에 비해서는 상대적으로 더 우수한 추천 정확도를 보이는 것으로 알려져 있다[Kim et al. | |
추천시스템은 무엇인가? | 추천시스템은 사용자의 행동으로부터 정보를 획득하여, Top-N 추천상품 리스트를 생성하거나 사용자의 평가점수를 질의 또는 예측하는 방법을 통하여 그들이 구매에 관심을 갖는 상품이나 구매를 원하는 상품을 쉽게 찾도록 지원해주는 데이터 분석기술 기반의 정보 필터링 시스템(information filtering system)이다[Sarwar et al.,2001]. |
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