• Asia pacific journal of information systems
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• 제14권4호
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• pp.87-97
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• 2004

One of the most fundamental problems in business is ranking items with respect to profit based on historical transactions. The difficulty is that the profit of one item comes from its influence on the sales of other items as well as its own sales, and that there is no well-developed algorithm for estimating overall profit of selected items. In this paper, we developed a product network based on association rule and an algorithm for profit estimation and item selection using the estimated profit ranking(EPR). As a result of computer simulation, the suggested algorithm outperforms the individual approach and the hub-authority profit ranking algorithm.

• Management Science and Financial Engineering
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• 제12권2호
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• pp.71-85
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• 2006

Collaborative filtering, among other recommender systems, has been known as the most successful recommendation technique. However, it requires the user-item rating data, which may not be easily available. As an alternative, some collaborative filtering algorithms have been developed recently by utilizing the market basket data in the form of the binary user-item matrix. Viewing the recommendation scheme as a two-class classification problem, we proposed a new collaborative filtering scheme using a regularized discriminant analysis applied to the binary user-item data. The proposed discriminant model was built in terms of the major principal components and was used for predicting the probability of purchasing a particular item by an active user. The proposed scheme was illustrated with two modified real data sets and its performance was compared with the existing user-based approach in terms of the recommendation precision.

• 통상정보연구
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• 제12권4호
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• pp.127-149
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• 2010

It is well known that FTA increases consumer welfare. However, it is difficult to analyze consumer welfare effects of FTA for item by item because of the difficulty in data collection. In this respect, this study aims at analyzing the types of increasing consumer welfares with item by item. According to the result of the study, there are five types of consumer welfare increased by FTA, and the items are like below: banana, kiwi, octopus, wine, and etc. However, it is hard for consumer to feel effects of FTA directly for several reasons. The problem of distribution structure of imported goods and, tariff reductions over long period are parts of the reasons to reduce the consumer wealfare effects. And the lack of consumer awareness about imported goods also reduces them. In order to promote FTA more efficiently, this study suggests that the government must improve the problems mentioned because consumer consent is essential element for further FTA promotion.

• 디지털산업정보학회논문지
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• 제12권1호
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• pp.13-26
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• 2016

Service and technology for the future hyper-connected society, which is every information receive through the mobile internet, will be an Internet of Things. Thus, it is mandatory to derive key standardization work item and establish strategy for the global business with the standardization of device and service platform by the application service. In this study, by analyzing the domestic and international market trends, state of technical development, and standardization of technology, we identified the open platform is the stepping stone for achieving the goal which is establishing the virtuous circulation of IoT ecosystem. Also, we defined emphasized key standardization work item for achieving the open platform are network, server, access authentication, billing system, and software platform. After that, we proposed future strategy direction of standardization. This research could be contribute to the IoT service diffusion by realizing IP communication among low power wireless terminals and implementing light-weight standard internet protocol.

• 환경위생공학
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• 제9권2호
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• pp.58-62
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• 1994

Until 1960 water pollution was caused by virus but now in according to industrial develop cent it has been continued environmental pollution by surfactant heavy metal, and hazardous chemical substance erst.. It is possible to Prevent contamination by virus owing to development of antibiotic but not to dissolve basely health effect by hazardous chemical substances because it takes very long time, about 5-40 years, average 20 years, in appearing a disease after exposure by then To maintain human life for 75 years, it need 55 ton of water. In the experiment of Public Health Institute, Tokyo, they reported that over 200 chemical substances can be detected in case of human being to drink tap water of Tokyo(1989) continuously. In our country, elevation of life style and development of industry result in increase of water use and overappreciation of pesticides in farm land a(sects drinking water quality. We estimated analytical item of drinking water hygienically by dividing into 5 groups such as physical effect item health hazardous inorganic item and health hazardous organic item ect. based on hygienic purpose.

• 한국IT서비스학회지
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• 제12권2호
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• pp.291-300
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• 2013

In this study, divide by a private enterprise and army, 2 organizations about observed priority item among administrator, service provider, user viewpoint about the information security item for smartwork activation and in 3 steps hierarchic according to AHP technique analyzed and decided priority for information security observance item. As a result, importance difference could confirm identified by administrator, service provider, user viewpoint period of about information security observance item recognizing in a private enterprise and army.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2002년도 정기총회 및 학술대회
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• pp.133-137
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• 2002

네트워크상에서 멀티미디어 컨텐츠(디지털 아이템)를 다양한 전송 매체(인터넷, 방송 무선전화 등)를 통해 전달하고, 서로 다른 기능의 단말기(PDA, PC, TV, Phone 등)를 통해 디지털 아이템을 소비하는데 있어 상호호환성(Interoperability)을 제공하기 위해 디지털 아이템의 생성, 전달, 소비 단계에 이르기까지 디지털 아이템의 규격을 제정하고자 MPEG-21(멀티미디어 프레임워크)이라는 이름의 국제 표준화 작업이 진행 중이다[1]. 본 논문에서는 MPEG-21의 디지털 아이템 선언 언어인 DIDL(Digital Item Declaration Language)을 이용하여 컨텍스트 디지털 아이템(XDI: conteXt Digital Item)을 XML 문서형태로 생성하고, 이를 컨텐츠 디지털 아이템(CDI: Content Digital Item)의 종류(영화, 음악, 도서, 게임 등)에 구애받지 않고 웹 브라우저를 통해 소비할 수 있는 디지털 아이템 브라우저를 구현하였다. 디지털 아이템의 다양한 형태에 적절히 대응하기 위해 XSLT(XML Stylesheet Language Transform)를 이용하여 디지털 아이템 정보를 표현하고 웹 브라우저를 통해 소비자의 환경에 적합한 디지털 아이템을 소비 및 이용할 수 있는 어플리케이션을 제공하는 환경에 대한 연구 결과를 제시한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권12호
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• pp.5826-5841
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• 2019

In our previous research, we proposed a tag emotion-based item recommendation scheme. The ternary associations among users, items, and tags are described as a three-order tensor in order to capture the emotions in tags. The candidates for recommendation are created based on the latent semantics derived by a high-order singular value decomposition technique (HOSVD). However, the tensor is very sparse because the number of tagged items is smaller than the amount of all items. The previous research do not consider the previous behaviors of users and items. To mitigate the problems, in this paper, the item-based collaborative filtering scheme is used to build an extended data. We also apply the probabilistic ranking algorithm considering the user and item profiles to improve the recommendation performance. The proposed method is evaluated based on Movielens dataset, and the results show that our approach improves the performance compared to other methods.

• 인터넷정보학회논문지
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• 제19권3호
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• pp.7-14
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• 2018

As SNS(Social Network Service) becomes a part of our life, new information can be derived through various information provided by SNS. Through the public timeline analysis of SNS, we can extract the latest tour trends for the public and the intimacy through the social relationship analysis in the SNS. The extracted intimacy can also be used to make the personalized recommendation by adding the weights to friends with high intimacy. We apply SNS elements such as analyzed latest trends and intimacy to item-based collaborative filtering techniques to achieve better accuracy and satisfaction than existing travel recommendation services in a new way. In this paper, we propose a social travel recommendation system using item - based collaborative filtering.

• 한국과학교육학회지
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• 제24권1호
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• pp.17-28
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• 2004

The purpose of this study is to determine the patterns of differences between genders in science achievement. Eleventh grade, 140 female and male students were sampled from a school in Seoul. According to the analysis results of pilot study, 20 items were finally selected for the main study. To sharpen our interpretations of the factors and provide some confirmation, we supplemented the statistical analysis with a more detailed cognitive study of the items using think-aloud protocols and interviews with student test takers. The analysis of this study took into account the different item formats, contexts, and presentation styles. The findings are as follows: First, there was no significant gender difference between multiple-choice and open-ended items. Second, male students achieved significantly better in the context of everyday life in multiple-choice items. Third, male students favored items presented as written texts. Fourth, in problem-solving process, female students tend to apply their science concepts, whereas male students tend to apply their everyday experiences. The results of this investigation indicate that gender difference in science achievement depends heavily on item characteristics.