查詢結果分析
來源資料
頁籤選單縮合
題 名 | 巢狀超矩形學習模式於乾旱季節流量預測之應用=An Application of the Nested Hyper-Rectangle Learning Model for Stream Fow Forecast in Droughty Seasons |
---|---|
作 者 | 張斐章; 林惠芬; | 書刊名 | 農業工程學報 |
卷 期 | 43:2 1997.06[民86.06] |
頁 次 | 頁20-28 |
分類號 | 351.81 |
關鍵詞 | 巢狀超矩形學習模式; 乾旱; 流量預測; 二次機會; NHRL; Drought; Stream flow forecasting; The second chance; |
語 文 | 中文(Chinese) |
中文摘要 | 本文主旨在探討「巢狀超矩形學習模試」於曾文溪流域幹旱時期之流量預測。研 究的主要對象為曾文水庫下游之玉田水文站每年乾季之旬流量。「巢狀超矩形學習模式」是 「依範例學習模式」的一種,它模擬人類經由經驗的累積以推估或分類事物的思考方式。此 模式最初將事件以點的方式貯存在歐氏 n 維空間中,隨著學習樣本的增加, 將「相配」的 範例視為同一類,並以超矩形方式記憶。此模式利用「類似度計量」來量測新加入樣本與已 存範例之類似度,並依相配與否,動態的調整「類似度計量」中的各組權重參數,故模式將 隨著學習樣本的增加而更接近真實狀況,亦即模式具學習的能力。本研究將「巢狀超矩形學 習模式」應用於乾旱季節之流量預測。預測結果顯示此模式在乾旱季節流量預測之適用性。 另外,本研究亦探討各種不同架構方式對模式預測能力的影響,其中「二次機會」達到節省 記憶空間且不影響預測精確度的效果。 |
英文摘要 | The main purpose of this study is to forecast the stream flow of Tsengwen river in droughty seasons by using the nested hyper-rectangles learning model (NHRL). The stream flow of Yu-Tien, a gauging station located on the downstream of Tsengwen reservoir, is used to investigate the statistical characteristics during the droughty seasons. The NHRL algorithm simulates the way human learns by experiences for estimation and classification. The learning is accomplished by storing objects in Euclidean n-space, E �c, as points in the beginning. And the exemplars are generalized to hyper-rectangles, if the examples "match" the exemplars. The hyper-rectangles may be nested inside one another to arbitrary depth. This model uses "Similarity Metric" to measure the similarity between the new example and examplar, while the weight parameters in "Similarity Metric" are adjusted dynamically. That is the model has the ability of learning. The NHRL model has been employed to forecast the stream flow. The forecasting results of the model show the fitness in stream flow forecasting. Several types of model's structures are further investigated in this study for understanding their influence in stream flow forecasting. 「 The second chance 」 does save the memory space and dos not reduce the accuracy. |
本系統中英文摘要資訊取自各篇刊載內容。