基于情境感知和序列模式挖掘的氣象學習資源推薦算法
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國家氣象信息中心網絡安全與“信創”技術研發創新團隊(NMIC-202011-05)攻關任務、中國氣象局2022年小型業務項目“氣象決策管理協同支撐建設”項目資助


Meteorology Learning Resource Recommendation Algorithm Based on Context Awareness and Sequential Pattern Mining
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    摘要:

    隨著互聯網的快速發展,氣象部門職工作為學習者可以獲得的學習資源得到極大豐富。信息超載導致檢索合適的在線學習資源時遇到了困難;學習者在不同學習環境和序列訪問模式上也有不同的學習需求。但是,現有的推薦系統,如基于內容的推薦和協同過濾,沒有結合學習者的情境和序列訪問模式,推薦結果準確度不高。本文提出了一種結合情境感知、序列模式挖掘和協同過濾算法的混合推薦算法來為學習者推薦學習資源?;旌贤扑]算法中,情境感知被用來整合學習者的情境信息,如知識水平和學習目標;序列模式挖掘被用來對網絡日志進行挖掘,發現學習者的序列訪問模式;協同過濾被用來根據學習者的情境數據和序列訪問模式為目標學習者計算預測并生成建議。實驗和應用效果表明,該混合推薦算法推薦的質量和準確性方面優于其他推薦算法。

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    With the rapid development of the Internet, the learning resources available to meteorological staff as learners are greatly enriched. Information overload leads to difficulties in retrieving suitable online learning resources; learners also have different learning needs in different environments and sequential access modes. However, existing recommendation systems, such as collaborative filtering and content-based recommendation, only involve two types of entities: items and users. They do not consider contextual information such as learners’ learning objectives and knowledge levels, as well as different sequential access patterns to learning resources, resulting in low accuracy in recommendation results. This paper proposes a hybrid recommendation algorithm that combines context awareness, sequential pattern mining, and collaborative filtering algorithms to recommend learning resources for learners. The hybrid recommendation algorithm includes three main steps: (1) integrating contextual information into the recommendation process using a contextual pre-filtering algorithm, (2) calculating learner similarity based on contextualised data and predicting the evaluation of learning resources, (3) generating the first N recommendations for the target learner, applying the GSP algorithm to the results, and filtering the final recommendations based on the learner’s sequential access patterns. In hybrid recommendation algorithms, context awareness is used to integrate contextual information about learners, such as knowledge level and learning objectives; sequential pattern mining is used to mine weblogs to discover learners’ sequential access patterns; collaborative filtering is used to calculate predictions and generate recommendations for targeted learners based on contextual data and sequential access patterns of learners. This hybrid recommendation algorithm incorporates contextual characteristics and learners’ sequential access patterns into the recommendation process to achieve improved personalised recommendation. When calculating the similarity between learners and learning items, the contextual characteristics of learners are taken into account; combining multiple recommendation techniques helps alleviate data sparsity problems. Experimental comparisons have shown that this recommendation algorithm is significantly superior to other recommendation algorithms in terms of recall, accuracy, and F1, especially when the neighbourhood value is 25. The hybrid recommendation algorithm is applied to the Yunzhipei intelligent teaching management system, with a user satisfaction rate of 93.7%, achieving a good application effect. In later stages, hybrid recommendation algorithms will be applied to the search and recommendation of electronic documents and institutional trees, providing assistance to meteorological employees in recommending accurate reference documents; it can also be combined with ElasticSearch to relocate and valuemine heterogeneous data, enhancing the value of business and management historical data.

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王帥,馬景奕,周遠洋,王甫棣.基于情境感知和序列模式挖掘的氣象學習資源推薦算法[J].氣象科技,2024,52(1):37~44

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  • 收稿日期:2023-01-13
  • 定稿日期:2023-11-09
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  • 在線發布日期: 2024-02-29
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