• 한국컴퓨터정보학회논문지
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• 제22권7호
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• pp.125-131
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• 2017

It is not easy for the user to find the information that is appropriate for the user among the suddenly increasing information in recent years. One of the ways to help individuals make decisions in such a lot of information is the recommendation system. Although there are many recommendation methods for such recommendation systems, a representative method is collaborative filtering. In this paper, we design and implement the movie recommendation system on user-based collaborative filtering of apache mahout. In addition, Pearson correlation coefficient is used as a method of measuring the similarity between users. We evaluate Precision and Recall using the MovieLens 100k dataset for performance evaluation.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.312-319
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• 2002

A recommendation system tracks past action of a group of users to make a recommendation to individual members of the group. The computer-mediated marking and commerce have grown rapidly nowadays so the concerns about various recommendation procedure are increasing. We introduce a recommendation methodology by which Korean department store suggests products and services to their customers. The suggested methodology is based on decision tree, product taxonomy, and association rule mining. Decision tree is to select target customers, who have high purchase possibility of recommended products. Product taxonomy and association rule mining are used to select proper products. The validity of our recommendation methodology is discussed with the analysis of a real Korean department store.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.320-325
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• 2002

Today many companies offer millions of products to customers. They are faced with a problem to choose particular products . In response to this problem a new marking strategy, recommendation has emerged. Among recommendation technologies collaborative filtering is most preferred. But the performance degrades with the number of customers and products. Namely, collaborative filtering has two major limitations, sparsity and scalability. To overcome these problems we introduced a new recommendation methodology using adjusted product hierarchy, grain. This methodology focuses on dimensionality reduction to improve recommendation quality and uses a marketer's specific knowledge or experience. In addition, it uses a new measure in the neighborhood formation step which is the most important one in recommendation process.

• Journal of Information Processing Systems
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• 제15권3호
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• pp.616-631
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• 2019

With the rapid increase of information on the World Wide Web, finding useful information on the internet has become a major problem. The recommendation system helps users make decisions in complex data areas where the amount of data available is large. There are many methods that have been proposed in the recommender system. Collaborative filtering is a popular method widely used in the recommendation system. However, collaborative filtering methods still have some problems, namely cold-start problem. In this paper, we propose a movie recommendation system by using social network analysis and collaborative filtering to solve this problem associated with collaborative filtering methods. We applied personal propensity of users such as age, gender, and occupation to make relationship matrix between users, and the relationship matrix is applied to cluster user by using community detection based on edge betweenness centrality. Then the recommended system will suggest movies which were previously interested by users in the group to new users. We show shown that the proposed method is a very efficient method using mean absolute error.

• Journal of Information Processing Systems
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• 제15권5호
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• pp.1141-1155
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• 2019

Today, most approaches used in the recommendation system provide correct data prediction similar to the data that users need. The method that researchers are paying attention and apply as a model in the recommendation system is the communities' detection in the big social network. The outputted result of this approach is effective in improving the exactness. Therefore, in this paper, the personalized movie recommendation system that combines data mining for the k-clique method is proposed as the best exactness data to the users. The proposed approach was compared with the existing approaches like k-clique, collaborative filtering, and collaborative filtering using k-nearest neighbor. The outputted result guarantees that the proposed method gives significant exactness data compared to the existing approach. In the experiment, the MovieLens data were used as practice and test data.

• Journal of Information Processing Systems
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• 제19권5호
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• pp.576-589
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• 2023

To upgrade home style recommendations and user satisfaction, this paper proposes a personalized and optimized recommendation algorithm for interior design style based on local social network, which includes data acquisition by three-dimensional (3D) model, home-style feature definition, and style association mining. Through the analysis of user behaviors, the user interest model is established accordingly. Combined with the location-based social network of association rule mining algorithm, the association analysis of the 3D model dataset of interior design style is carried out, so as to get relevant home-style recommendations. The experimental results show that the proposed algorithm can complete effective analysis of 3D interior home style with the recommendation accuracy of 82% and the recommendation time of 1.1 minutes, which indicates excellent application effect.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권11호
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• pp.2903-2923
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• 2023

Knowledge recommendation is a type of recommendation system that recommends knowledge content to users in order to satisfy their needs. Although using graph neural networks to extract data features is an effective method for solving the recommendation problem, there is information loss when modeling real-world problems because an edge in a graph structure can only be associated with two nodes. Because one super-edge in the hypergraph structure can be connected with several nodes and the effectiveness of knowledge graph for knowledge expression, a dual-channel hypergraph convolutional neural network model (DCHC) based on hypergraph structure and knowledge graph is proposed. The model divides user data and knowledge data into user subhypergraph and knowledge subhypergraph, respectively, and extracts user data features by dual-channel hypergraph convolution and knowledge data features by combining with knowledge graph technology, and finally generates recommendation results based on the obtained user embedding and knowledge embedding. The performance of DCHC model is higher than the comparative model under AUC and F1 evaluation indicators, comparative experiments with the baseline also demonstrate the validity of DCHC model.

• 한국지능시스템학회논문지
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• 제16권2호
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• pp.185-190
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• 2006

유비쿼터스 컴퓨팅에서 대부분의 시스템들이 개인화된 추천을 위하여 사용자와 성향이 비슷한 사람들의 컨텍스트 정보를 분석하는데 인구통계학적 방법이나 협력적 필터링을 주로 사용한다. 서비스 추천 시스템들은 컨텍스트 정보 중에서 성별, 나이, 직업, 구매이력 등의 정적 컨텍스트를 주로 사용하고 있다. 그러나 이러한 시스템은 이동경로 같은 사용자의 상황을 고려하기가 어렵기 때문에 개인의 성향을 정확하게 분석하여 실시간으로 개인화된 추천 서비스를 제공하는데 한계가 있다. 본 논문에서는 사용자의 상황을 고려하기 위해 동적 컨텍스트 중에서 사용자의 이동경로를 이용한다. 이동경로의 예측 정확도를 높이기 위해 RSOM의 입력으로 들어가는 이동경로를 경로보정 알고리즘을 사용하여 보정한다. 그리고 보정된 경로를 RSOM으로 학습시켜 사용자의 이동패턴을 분석하고 향후 이동경로를 예측한 후, 사용자의 선호도가 높은 상품들 중에서 예측 경로 상에 있는 가장 가까운 상품을 실시간으로 추천한다. 제안한 방법의 예측 정확도를 측정한 결과 MAE가 평균 0.5 이하로 측정됨으로써 사용자의 이동경로를 올바르게 예측할 수 있음을 확인하였다.

• 한국지능시스템학회논문지
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• 제17권4호
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• pp.488-493
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• 2007

추천 시스템은 일반적으로 서비스를 추천하기 위해 협력적 필터링 단계에서 실시간으로 얻어진 컨텍스트 정보를 정량화하여 사용하고 있다. 하지만 이러한 추천시스템은 컨텍스트 정보의 부족으로 부정확한 추천 결과를 가져오거나, 정량화 단계의 단순한 분류과정으로 인해 사용자를 부정확한 그룹으로 분류하는 문제점이 발생한다. 본 논문에서는 실시간으로 획득되는 컨텍스트 정보 부족 문제를 내용 기반 필터링에서 사용하는 사용자 프로파일 정보와 실시간으로 획득된 컨텍스트 정보를 결합하여 해결하였다. 그리고 정량화 단계의 분류 과정을 절대적인 방법이 아니라 상대적인 방법으로 개선하여 협력적 필터링하였다. 실험 결과, pure P2P 환경에서 컨텍스트 정보를 이용한 실시간 추천 시스템보다 예측 선호도가 5.8% 향상되었다.

• 지능정보연구
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• 제14권1호
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• pp.101-115
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• 2008

일반적으로 혼합 추천 시스템(hybrid recommender system)이란 협업적 여과 방법(collaborative filtering)을 다른 기술들과 결합하여 사용하여 사용자가 원하는 정보를 손쉽게 찾을 수 있도록 도와주는 시스템이다. 협업적 여과 방법과 결합된 혼합 시스템은 대체로 내용이 유사한 아이템들이 추천 되어 전반적인 아이템 추천 성능 및 새로이 추가된 아이템에 대한 추천의 질이 떨어지는 문제가 있다. 이러한 문제를 해결하기 위해, 본 논문에서는 다양성(diversity)을 고려한 새로운 혼합 추천 시스템을 제안한다. 제안된 시스템에서는 첫 번째 단계로 협업적 여과 방법으로부터 추천된 아이템들 간의 비유사도를 측정한다. 두 번째 단계로는 첫 번째 단계에선 추천된 비유사도가 높은 아이템들을 내용 기반의 여과 방법(content-based filtering)에 적용하여 새로운 아이템에 대한 추천 성능을 향상 시킨다. 제안된 방법의 성능 평가를 위해 movielens 데이터를 이용하여 기존의 내용기반 추천 시스템 및 단순 혼합 시스템과 비교 평가하였다. 실험 결과 제안된 방법이 내용기반 추천 시스템 및 단순 혼합시스템보다 높은 추천 성능을 보였다.