• 제목/요약/키워드: Collaborative form

검색결과 138건 처리시간 0.024초

A Hybrid Recommendation System based on Fuzzy C-Means Clustering and Supervised Learning

  • Duan, Li;Wang, Weiping;Han, Baijing
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제15권7호
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    • pp.2399-2413
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    • 2021
  • A recommendation system is an information filter tool, which uses the ratings and reviews of users to generate a personalized recommendation service for users. However, the cold-start problem of users and items is still a major research hotspot on service recommendations. To address this challenge, this paper proposes a high-efficient hybrid recommendation system based on Fuzzy C-Means (FCM) clustering and supervised learning models. The proposed recommendation method includes two aspects: on the one hand, FCM clustering technique has been applied to the item-based collaborative filtering framework to solve the cold start problem; on the other hand, the content information is integrated into the collaborative filtering. The algorithm constructs the user and item membership degree feature vector, and adopts the data representation form of the scoring matrix to the supervised learning algorithm, as well as by combining the subjective membership degree feature vector and the objective membership degree feature vector in a linear combination, the prediction accuracy is significantly improved on the public datasets with different sparsity. The efficiency of the proposed system is illustrated by conducting several experiments on MovieLens dataset.

Network-based Cooperative TV Program Production System

  • H.Sumiyoshi;Y.Mochizuki;S.Suzuki;Y.Ito;Y.Orihara;N.Yagi;Na, M.kamura;S.Shimoda
    • 한국방송∙미디어공학회:학술대회논문집
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    • 한국방송공학회 1997년도 Proceedings International Workshop on New Video Media Technology
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    • pp.75-81
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    • 1997
  • A new DTPP (Desk-Top Program Production) system has been developed that enables multiple program producers (directors) working at different locations to collaborate over a computer network and prepare a single program for broadcasting. In this system, information is shared among users by exchanging data edited on non-linear editing terminals in program post-production work over a network in real time. In short, the new DTPP system provides a collaborative work space for producing TV programs. The system does not make use of a special server for collaborative work but rather multiple interconnected editing terminals having the same functions. In this configuration, data at a terminal which has just been edited by some operation is forwarded to all other connected terminals for updating. This form of information sharing, however, requires that some sort of data synchronizing method be established since multiple terminals are operating on the same data simultaneously. We therefore adopt a method whereby the system synchronizes the clocks on each terminal at the time of connection and sends an operation time stamp together with edited data. This enables most recently modified data to be identified and all information on all terminals to be updated appropriately. This paper provides an overview of this new collaborative DTPP system and describes the techniques for exchanging edited data and synchronizing data.

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개방형 협업을 위한 R&D 전주기 서비스, WithON 설계 (Design of an Entire R&D Cycle Service, WithON for Open Collaboration)

  • 정한민;박정훈
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2022년도 춘계학술대회
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    • pp.31-33
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    • 2022
  • ScienceON, RISS, DBpia 등 연구자들이 R&D 과정 중에 이용하는 연구 정보 서비스는 포털 형식의 사용자 인터페이스와 함께 요구 대응 방식(Pull)의 검색 기능이 주를 이루고 있다. 그렇지만, 연구 과정과 결과를 자유롭게 공유·활용하고 협업 연구에 필요한 다양한 도구와 서비스를 제공하는 개방형 협업에 대한 요구가 점차 커지고 있어, 이러한 서비스 역할의 한계도 존재한다. 이에 우리는 R&D 전주기를 지원하기 위한 개인화된 연구 환경 인터페이스를 중심으로 선제 대응 방식(Push)의 목표 지향적 분석을 수행하는 WithON을 설계한다. 본 연구를 통해 제시하는 WithON이 개방형 협업을 위한 가상 공간을 제공함으로써 기존 연구 정보 서비스 방식을 근본적으로 바꿀 것으로 기대한다.

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Supervised Learning-Based Collaborative Filtering Using Market Basket Data for the Cold-Start Problem

  • Hwang, Wook-Yeon;Jun, Chi-Hyuck
    • Industrial Engineering and Management Systems
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    • 제13권4호
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    • pp.421-431
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    • 2014
  • The market basket data in the form of a binary user-item matrix or a binary item-user matrix can be modelled as a binary classification problem. The binary logistic regression approach tackles the binary classification problem, where principal components are predictor variables. If users or items are sparse in the training data, the binary classification problem can be considered as a cold-start problem. The binary logistic regression approach may not function appropriately if the principal components are inefficient for the cold-start problem. Assuming that the market basket data can also be considered as a special regression problem whose response is either 0 or 1, we propose three supervised learning approaches: random forest regression, random forest classification, and elastic net to tackle the cold-start problem, comparing the performance in a variety of experimental settings. The experimental results show that the proposed supervised learning approaches outperform the conventional approaches.

A Study on the Interrelationship between the Prediction Error and the Rating's Pattern in Collaborative Filtering

  • Lee, Seok-Jun;Kim, Sun-Ok;Lee, Hee-Choon
    • Journal of the Korean Data and Information Science Society
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    • 제18권3호
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    • pp.659-668
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    • 2007
  • Collaborative filtering approach for recommender systems are now widely applied in e-commerce to assist customers to find their needs from many that are frequently available. this approach makes recommendations for users based on the opinions to similar users in the system. But this approach is opened to users who present their preference to items or acquire the preference information form other users, noise in the system makes significant problem for accurate recommendation. In this paper, we analyze the relationship between the standard deviation of preference ratings for each user and the estimated ratings of them. The result shows that the possibility of the pre-filtering condition which detecting the factor of bad effect on the prediction of user's preference. It is expected that using this result will reduce the possibility of bad effect on recommender systems.

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Effect of bamboo shoot dietary fiber on gel properties, microstructure and water distribution of pork meat batters

  • Li, Ke;Liu, Jun-Ya;Fu, Lei;Zhao, Ying-Ying;Zhu, He;Zhang, Yan-Yan;Zhang, Hua;Bai, Yan-Hong
    • Asian-Australasian Journal of Animal Sciences
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    • 제33권7호
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    • pp.1180-1190
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    • 2020
  • Objective: To develop healthier comminuted meat products to meet consumer demand, the gel properties, rheological properties, microstructure and water distribution of pork meat batters formulated with various amounts of bamboo shoot dietary fiber (BSDF) were investigated. Methods: Different levels of BSDF (0% to 4%) were added to pork batters, and the pH, color, water-holding capacity, texture and rheological properties of pork batters were determined. Then, pork batters were analyzed for their microstructure and water distribution using scanning electron microscopy (SEM) and low-field nuclear magnetic resonance (LF-NMR). Results: Compared with the control, BSDF addition into meat batters showed a significant reduction in L*-value and a significant increase in b*-value (p<0.05). BSDF addition of up to 4% reduced the pH value of pork batters by approximately 0.15 units; however, the cooking loss and expressible water loss decreased significantly (p<0.05) with the increased addition of BSDF. The hardness and gel strength were noticeably enhanced (p<0.05) as the content of BSDF increased. The rheological results showed that BSDF added into pork batters produced higher storage modulus (G') and loss modulus (G") values. The SEM images suggested that the addition of BSDF could promote pork batters to form a more uniform and compact microstructure. The proportion of immobilized water increased significantly (p<0.05), while the population of free water was decreased (p<0.05), indicating that BSDF improved the water-holding capability of pork batters by decreasing the fraction of free water. Conclusion: BSDF could improve the gel properties, rheological properties and water distribution of pork meat batters and decrease the proportion of free water, suggesting that BSDF has great potential as an effective binder in comminuted meat products.

Reduce on the Cost of Photovoltaic Power Generation for Polycrystalline Silicon Solar Cells by Double Printing of Ag/Cu Front Contact Layer

  • Peng, Zhuoyin;Liu, Zhou;Chen, Jianlin;Liao, Lida;Chen, Jian;Li, Cong;Li, Wei
    • Electronic Materials Letters
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    • 제14권6호
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    • pp.718-724
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    • 2018
  • With the development of photovoltaic industry, the cost of photovoltaic power generation has become the significant issue. And the metallization process has decided the cost of original materials and photovoltaic efficiency of the solar cells. Nowadays, double printing process has been introduced instead of one-step printing process for front contact of polycrystalline silicon solar cells, which can effectively improve the photovoltaic conversion efficiency of silicon solar cells. Here, the relative cheap Cu paste has replaced the expensive Ag paste to form Ag/Cu composite front contact of silicon solar cells. The photovoltaic performance and the cost of photovoltaic power generation have been investigated. With the optimization on structure and height of Cu finger layer for Ag/Cu composite double-printed front contact, the silicon solar cells have exhibited a photovoltaic conversion efficiency of 18.41%, which has reduced 3.42 cent per Watt for the cost of photovoltaic power generation.

사서교사와 국어교사의 협동수업이 중학생의 학습흥미와 학업성취도에 미치는 영향에 대한 연구 (A Study on the Effect of Collaborative Instruction Between a Teacher Librarian and a Korean Language Teacher on a Middle School Student's Learning Interest and Academic Achievement)

  • 기민진;송기호
    • 한국문헌정보학회지
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    • 제47권2호
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    • pp.123-142
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    • 2013
  • 본 연구의 목적은 사서교사의 정보활용교육용 교과서인 "도서관과 정보생활"과 중학교 1학년 국어교과를 협동수업을 통해서 운영하고, 협동수업이 학생들의 학습흥미와 학업성취에 어떤 영향을 끼치는지 밝히는 것이다. 연구 결과 학교도서관의 자료를 기반으로 사서교사와 국어교사가 상호 협력하여 공동으로 수업을 계획하고, 전개하며, 평가하는 것은 학생들에게 국어교과에 대한 학습흥미를 촉진시킴으로써 학업성취도 측면에서도 긍정적인 영향을 미치는 것으로 나타났다. 따라서 학교 교육에서 정보활용교육을 활성화시키기 위해서는 협동수업을 실시할 수 있는 제도적 기반을 마련하는 것이 중요하다. 단위 학교 수준에서는 도서관의 물리적 환경 개선과 충분한 기교재 확충이 필요하다. 또한 정보활용력에 대한 체계적인 지도와 자료 활용을 위한 충분한 수업시간을 확보할 수 있는 탄력형 시간표 편성이 이루어져야 한다.

협력적 북마킹의 태킹 행태 분석 (Analysis of the usage Pattern of Tagging in Collaborative Bookmarking)

  • 최준연;김용수
    • 한국콘텐츠학회논문지
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    • 제9권7호
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    • pp.193-201
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    • 2009
  • 웹문서의 특성을 표현하기 위해 키워드 형태로 부여하는 태깅의 이용이 다양한 웹서비스에서 확산되고 있다. 온라인 즐겨찾기 서비스라고 말할 수 있는 협력적 북마킹 서비스에서도 태깅이 중요한 역할을 수행하는데, 사용자가 부여한 태그는 자신의 북마크를 손쉽게 검색하고 타사용자의 웹문서 검색을 정교하게 만들어준다. 본 연구에서는 사용자들의 태깅 데이터를 분석하여 웹문서와 사용자의 태그 수에 영향을 주는 요인이 무엇인가를 탐색하였다. 웹문서의 태그 수에는 웹문서의 특성보다 사용자의 특성에 따라 더 큰 편차를 보였으며, 이것은 사용자의 성향이 태그의 다양성에 더 큰 영향을 미친다는 것을 의미한다. 또한 추종적 사용자보다는 가장 먼저 웹문서를 북마킹하는 선도적 사용자들이 더 많은 태그를 생성하는데 기여하는 것으로 나타났다. 풍부하고 다양한 태깅을 통해 서비스의 품질을 향상시키기 위해서는 선도적 사용자들에 대한 보상과 인센티브를 통해 더 많은 지식을 생성할 수 있도록 해야 한다는 시사점을 제공한다.

위키를 활용한 협력학습이 타인과의 긍정적인 상호작용에 미치는 영향 연구 (A Collaborative learning using Wiki for the effectiveness of positive interaction)

  • 조윤재;문교식
    • 한국정보교육학회:학술대회논문집
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    • 한국정보교육학회 2011년도 동계학술대회
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    • pp.167-173
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    • 2011
  • 현재 우리 사회는 웹 1.0 시대를 지나 웹 2.0 이라는 새로운 웹 패러다임으로 진화하고 있다. 웹 2.0의 가장 큰 특징은 개방, 참여, 공유의 세 가지의 정신을 다양한 형태로 실현한다는 것이다. 이러한 웹 2.0을 가장 대표하는 것이 바로 위키이다. 위키는 온라인상에서 다수의 컴퓨터 사용자가 서로 연결되어 자유롭게 서로의 글을 공동 편집할 수 있도록 구현된 동적 프로그래밍 도구이다. 그러므로 온라인상에서 학생들간 협력학습을 구현해 내는데 있어서 아주 효과적일 수 있고 그러한 협력학습을 하는 과정에서 학생들은 자연스럽게 긍정적인 상호작용 기술들을 습득하게 될 것이다. 즉, 본 연구는 이러한 위키를 통한 초동학생들의 온라인 협력학습 과정이 공격적이고 비판적인 성향이 강한 학생들에게 필요한 배려심, 너그러움 등의 긍정적인 상호작용 기술을 습득하도록 하는데 도움을 줄 수 있다는 결과를 제시하고자 한다.

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