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    政大機構典藏 > 商學院 > 資訊管理學系 > 學位論文 >  Item 140.119/77172
    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/77172

    Title: 適用於動態環境中偵測離群值之決策支援機制
    A Decision Support Mechanism for Outlier Detection in the Concept Drifting Environment
    Authors: 林哲緯
    Contributors: 蔡瑞煌
    Tsaih, Rua Huan
    Keywords: 離群值偵測
    outlier detection
    concept drifting
    moving window
    neural networks
    decision support
    Date: 2015
    Issue Date: 2015-08-03 13:19:50 (UTC+8)
    Abstract: 近來,偵測離群值已成為一個重要且具有挑戰性的研究議題。從給定之觀察值中我們可以推導出一個適配函數(fitting function),並依照距離此適配函數之距離決定出離群值(outlier)。而此議題在現今的環境中,更為困難:因現今之資料來源多為動態性且不穩定的環境,造成現在的資料具有概念飄移(concept drifting)之特性。
    (1)使用自適應的單一隱藏層倒傳遞神經網路(single-hidden layer feed-forward neural networks, SLFN)來實作出穩健學習(resistant learning)之概念;
    (2)透過移動視窗(moving window)機制實現增量學習(incremental learning)之策略;
    Outliers are observations far away from the fitting function that is deduced from the bulk of the given observations. Recently, to detect them has become an important issue. Since the data nature in the current era has become more concept-drifting, the outlier detection has become more challenging. To address this challenging issue, this study develops a decision support mechanism (DSM) for coping with the outlier detection problem in the concept-drifting environment. Specifically, this study wants to derive a DSM for identifying the potential intrusion detection in network security. The proposed DSM has the following features: (1) the implementation of the resistant learning concept via the adaptive single-hidden layer feed-forward neural networks, (2) the implementation of the incremental learning concept via the moving window technique, and (3) the efficiency and effectiveness in terms of having to review a much less amount of sample and getting a better accuracy of outlier detection. An experiment is designed to justify the proposed DSM. Experiment results show that the performance of proposed DSM is very promising.
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    Description: 碩士
    Source URI: http://thesis.lib.nccu.edu.tw/record/#G0102356002
    Data Type: thesis
    Appears in Collections:[資訊管理學系] 學位論文

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