• Proceedings of the Korea Association of Information Systems Conference
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• 2005.05a
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• pp.393-408
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• 2005

인터넷의 성장은 고객에게 많은 혜택을 주었지만, 방대한 양의 정보는 오히려 장시간의 상품 탐색과 제품 선택을 어렵게 만들었다. 이에 따라, 정보의 양을 줄여 줄 수 있는 서비스를 고객들은 요구를 하기 시작하였고, 이에 따라 다양한 방법들이 고객에게 제시 되어졌다. 제시되어진 방법 중의 하나가 개인화 추천 시스템이다. 추천 시스템은 고객의 취향과 관심에 적합한 상품을 추천 해 주는 서비스로서 상품 검색 노력을 줄여 주고, 고객의 취향에 적합한 제품을 제시 해 줌으로써 고객충성도 제고에도 많은 도움을 주고 있다. 이러한 추천 시스템에서 가장 많이 사용되어지고 있는 기법은 협업 필터링이다. 협업 필터링은 협업에서도유용한 기법으로 인정을 받았다. 하지만 희박성과 확장성이라는 문제점으로 인해 추천의 정확도가 다소 떨어진다는 것이 단점이다. 본 연구에서는 이러한 단점을 극복할 수 있는 방법으로써 Hybrid 협업 필터링 기법을제시하고, 이를 토대로 추천 기법이 혼합되어진 Hybrid 추천 시스템에 대한 개념을 제시하고자 한다.

• Journal of Intelligence and Information Systems
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• v.14 no.4
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• pp.201-216
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• 2008

Nowadays various new items are available, but limitation of searching effort makes it difficult for customers to search new items which they want to purchase. Therefore new item providers and customers need recommendation systems which recommend right items for right customers. In this research, we focus on the new item recommendation issue, and suggest preference boundary- based procedures which extend traditional content-based algorithm. We introduce the concept of preference boundary in a feature space to recommend new items. To find the preference boundary of a target customer, we suggest heuristic algorithms to find the centroid and the radius of preference boundary. To evaluate the performance of suggested procedures, we have conducted several experiments using real mobile transaction data and analyzed their results. Some discussions about our experimental results are also given with a further research area.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2004.10a
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• pp.657-660
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• 2004

규칙기반의 상품추천시스템은 많은 인터넷 쇼핑몰에서 활용되고 있지만 규칙을 추출할 수 있는 마케팅 전문가 확보와 방대한 양의 고객 데이터 처리의 어려움으로 유용한 규칙을 찾는 것이 매우 어렵다. 본 연구에서는 이러한 규칙기반 상품추천시스템의 단점을 보완할 수 있는 방법으로 전역 최적화 기법의 하나인 유전자 알고리즘을 활용하여 고객정보를 토대로 추천 규칙을 도출할 수 있는 방안을 제시한다. 또한 본 연구에서 제안한 유전자 알고리즘에 기반한 추천 규칙들이 장착된 웹 기반의 개인화된 상품추천시스템의 프로토타입을 개발하고 이에 대한 실제 사용자들의 이용 만족도를 확인함으로써 본 연구에서 제안한 방법론의 유용성을 확인하고자 한다.

• Journal of Intelligence and Information Systems
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• v.13 no.1
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• pp.91-105
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• 2007

This research suggests a recommendation system that enables bidirectional communications between the user and system using a utility range-based product recommendation algorithm in order to provide more dynamic and personalized recommendations. The main idea of the proposed algorithm is to find the utility ranges of products based on user specified preference information and calculate the similarity by using overlapping probability of two range values. Based on the probability, we determine what products are similar to each other among the products in the product list of collaborative companies. We have also developed a Web-based application system to recommend similar products to the customer. Using the system, we carry out the experiments for the performance evaluation of the procedure. The experimental study shows that the utility range-based approach is a viable solution to the similar product recommendation problems from the viewpoint of both accuracy and satisfaction rate.

• Journal of Intelligence and Information Systems
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• v.15 no.1
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• pp.123-140
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• 2009

Collaborative filtering recommends products using customers' preferences, so it cannot recommend products to the new customer who has no preference information. This paper proposes a novel approach to new customer recommendations using the social network analysis which is used to search relationships among social entities such as genetics network, traffic network, organization network, etc. The proposed recommendation method identifies customers most likely to be neighbors to the new customer using the centrality theory in social network analysis and recommends products those customers have liked in the past. The procedure of our method is divided into four phases : purchase similarity analysis, social network construction, centrality-based neighborhood formation, and recommendation generation. To evaluate the effectiveness of our approach, we have conducted several experiments using a data set from a department store in Korea. Our method was compared with the best-seller-based method that uses the best-seller list to generate recommendations for the new customer. The experimental results show that our approach significantly outperforms the best-seller-based method as measured by F1-measure.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2005.05a
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• pp.258-265
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• 2005

전자상거래의 확산에 따라 인터넷 쇼핑몰에서의 구매활동은 일반적인 현상이 되었다. 그 결과, 유사한 업종이나 업태의 인터넷 쇼핑몰이 범람하게 되었고 업체들 간의 경쟁도 심화되어 차별화된 서비스를 제공하지 않는 업체는 도태되기 쉬운 상황이다. 본 연구에서는 치열한 경쟁환경 하에서 인터넷 쇼핑몰의 차별화된 마케팅 서비스의 수단으로써 이용되고 있는 상품추천시스템의 개선된 모형을 제시하고자 한다. 본 연구에서 제안하는 모형은 전역 최적화 기법 중의 하나인 유전자 알고리즘을 데이터 마이닝의 도구로 활용한 인터넷 쇼핑몰에서의 개인화된 상품추천시스템 모형이다. 유전자 알고리즘은 추출하기가 어려운 소비자의 성향을 데이터를 통해 추출하고 이에 맞는 상품군을 선택할 수 있도록 해주는 최적화 기법으로 상품추천시스템의 추천엔진으로써 유용할 것으로 기대된다. 본 연구에서는 제안한 유전자 알고리즘에 기반한 추천 규칙들이 장착된 웹 기반의 개인화된 상품추천시스템의 프로토타입을 개발하고 이에 대한 실제 사용자들의 이용 만족도를 확인함으로써 본 연구에서 제안한 방법론의 유용성을 확인하고자 한다.

• Journal of Intelligence and Information Systems
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• v.15 no.4
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• pp.183-200
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• 2009

Collaborative Filtering is one of the most used recommender systems. However, basically it cannot be used to recommend new products to customers because it finds products only based on the purchasing history of each customer. In order to cope with this shortcoming, many researchers have proposed the hybrid recommender system, which is a combination of collaborative filtering and content-based filtering. Content-based filtering recommends the products whose attributes are similar to those of the products that the target customers prefer. However, the hybrid method is used only for the limited categories of products such as music and movie, which are the products whose attributes are easily extracted. Therefore it is essential to find a more effective approach to recommend to customers new products in any category. In this study, we propose a new recommendation method which applies centrality concept widely used to analyze the relational and structural characteristics in social network analysis. The new products are recommended to the customers who are highly likely to buy the products, based on the analysis of the relationships among products by using centrality. The recommendation process consists of following four steps; purchase similarity analysis, product network construction, centrality analysis, and new product recommendation. In order to evaluate the performance of this proposed method, sales data from H department store, one of the well.known department stores in Korea, is used.

• Journal of Intelligence and Information Systems
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• v.8 no.2
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• pp.139-157
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• 2002

The rapid growth of e-commerce has made both companies and customers face a new situation. Whereas companies have become to be harder to survive due to more and more competitions, the opportunity for customers to choose among more and more products has increased. So, the recommender systems that recommend suitable products to the customer have an important position in E-commerce. This research introduces collaborative filtering based recommender system which helps customers find the products they would like to purchase by producing a list of top-N recommended products. The suggested methodology is based on decision tree, product taxonomy, and association rule mining. Decision tree is used to select target customers, who have high possibility of purchasing recommended products. We applied the recommender system to a Korean department store. The methodology is evaluated with the analysis of a real department store case and is compared with other methodologies.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.527-530
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• 2002

협동적 추천은 사용자의 상품에 대한 구매 데이터를 이용하여 상품을 추천하는 방법이다. 그러나 구매 데이터가 희소한 경우 추천의 정확도가 떨어지는 문제점이 있다. 이러한 희소성 문제를 해결하기 위해서 클러스터링, SVD 등 다양한 방법이 제시되었으나, 근본적으로 사용자의 성향을 파악하기에는 부족한 점이 있다. 구매 데이터만을 이용했을 때의 문제점을 해결하기 위해서는 이를 보완할 수 있는 데이터의 활용이 필요하다. 웹 로그 분석을 통해서 구매 데이터의 희소성을 보완할 수 있으며, 사용자의 상품에 대한 부정적 반응을 구매 데이터에 반영할 수 있다. 본 논문에서는 웹 사이트에 접근하는 사용자들에 의해서 만들어진 웹 로그를 분석하여 추천 시스템의 성능을 개선하였다.

• Journal of Digital Convergence
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• v.15 no.12
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• pp.293-301
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• 2017

Most new products not only suddenly disappear in the market but also quickly cannibalize older products. Under such a circumstance, retailers may have too much stock, and customers may be faced with difficulties discovering products suitable to their preferences among short life cycle products. To address these problems, recommender systems are good solutions. However, most previous recommender systems had difficulty in reflecting changes in customer preferences because the systems employ static customer preferences. In this paper, we propose a recommendation methodology that considers dynamic customer preferences. The proposed methodology consists of dynamic customer profile creation, neighborhood formation, and recommendation list generation. For the experiments, we employ a mobile image transaction dataset that has a short product life cycle. Our experimental results demonstrate that the proposed methodology has a higher quality of recommendation than a typical collaborative filtering-based system. From these results, we conclude that the proposed methodology is effective under conditions where most new products have short life cycles. The proposed methodology need to be verified in the physical environment at a future time.