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研究生: 黃敬庭
Huang, Jing-Ting
論文名稱: 求解多極值連續型最佳化問題之演化演算法設計
Design of Evolutionary Algorithm for Solving Multimodal Continuous Optimization Problems
指導教授: 蔣宗哲
Chiang, Tsung-Che
口試委員: 鄒慶士
Tsou, Ching-Shih
温育瑋
Wen, Yu-Wei
蔣宗哲
Chiang, Tsung-Che
口試日期: 2023/01/31
學位類別: 碩士
Master
系所名稱: 資訊工程學系
Department of Computer Science and Information Engineering
論文出版年: 2023
畢業學年度: 111
語文別: 中文
論文頁數: 62
中文關鍵詞: 演化演算法多極值連續型最佳化利基演算法子族群差分演化演算法
研究方法: 實驗設計法
DOI URL: http://doi.org/10.6345/NTNU202300305
論文種類: 學術論文
相關次數: 點閱:36下載:0
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  • 多極值連續型最佳化問題需要在決策空間中找出數個相異的全域最佳解,許多現實問題皆是多極值問題,如:桁架 (truss) 結構最佳化、藥物分子設計及工廠排程問題等,在此類問題中找到相異的全域最佳解可以幫助決策者了解問題背後隱藏的因素,或是提供備選方案以備不時之需。近幾年演化演算法逐漸成為解最佳化問題的主流演算法,此類方法利用解個體之間彼此交換資訊、產生新的解個體以此來使族群逐漸往全域最佳解收斂,但收斂意味者族群多樣性喪失或陷入區域最佳解而無法找出其它潛力解,因此如何避免收斂並維持族群多樣性以搜尋不同的區域,是利用演化演算法解多極值最佳化問題的其中一項重要議題。
    本論文提出了使用混合利基法之潛力區域探索演算法框架 (Promising Area Exploration based on Hybrid Niching, PAEHN),探討如何將主要族群分為多個子族群以搜尋解空間中的相異區域。在演化過程中記錄潛力解區域,當子族群都已收斂或停滯時,在潛力解區域附近重新產生主要族群以搜尋更多最佳解。此框架可套用不同的演化演算法進行演化,本論文使用 SHADE 作為基底演算法,SHADE 為自適應參數控制的差分演算法且已被證實於連續型單目標最佳化問題具有良好的效率。實驗結果得知 PAEHN 在容許誤差小的情況下具有良好的競爭力;而在容許誤差大的情況下具有相當強的優勢,於 20 個測試問題中有 18 個問題可以找出所有的全域最佳解,且 PAEHN 不需要使用問題的任何先備知識。

    中文摘要 i 致謝 ii 目錄 iii 附表目錄 v 附圖目錄 vi 第一章 緒論 1 1.1 研究背景 1 1.2 問題定義 2 1.3 差分演化演算法 3 1.3.1 初始化 (initialization) 4 1.3.2 突變 (mutation) 4 1.3.3 交配 (crossover) 6 1.3.4 環境選擇 (selection) 7 1.4 論文架構 8 第二章 文獻探討 9 2.1 利基方法 9 2.1.1 排擠法 9 2.1.2 清除法 10 2.1.3 種化法 12 2.1.4 適應值分享法 14 2.1.5 分群法 15 2.1.6 可套用不同利基方法之演算法框架 16 2.1.7 混合利基方法 18 2.2 收斂與停滯 (計算資源分配) 18 2.3 記憶族群 19 2.4 其它 20 2.5 本論文提出之演算法框架與文獻演算法使用技術比較 21 第三章 使用混合利基法之潛力解區域探索演算法框架設計 22 3.1 初始化 22 3.2 開採 - 形成子族群 23 3.3 SHADE 27 3.4 子族群停滯 29 3.5 維護多樣性 - 紀錄潛力解區域 32 3.6 探索 - 形成新的主要族群 33 3.7 潛力解區域探索之混合利基框架 35 3.8 與文獻演算法相異處 36 3.8.1 近鄰種化法 37 3.8.2 清除法 37 3.8.3 計算資源分配 37 3.8.4 記憶族群 37 3.8.5 排擠法 38 3.8.6 維護族群多樣性 38 3.8.7 先備知識 38 第四章 實驗設計與結果 40 4.1 評估函式 40 4.1.1 區域最佳解皆為全域最佳解 41 4.1.2 區域最佳解不一定為全域最佳解 41 4.1.3 複合函式 42 4.2 效能指標 42 4.3 演算法參數設定 43 4.4 PAEHN 框架成分分析 44 4.4.1 PAEHN-1:移除遞迴清除法 45 4.4.2 PAEHN-2:隨機產生新的主要族群 46 4.4.3 PAEHN-3:隨機更新潛力解族群 Aip 46 4.4.4 PAEHN-4:不重啟潛力解族群 Aip 中過於擁擠之解個體 47 4.4.5 停滯計數閾值上限 47 4.5 PAEHN 實驗分析與文獻演算法比較結果 49 4.5.1 PAEHN 實驗分析 49 4.5.2 與文獻演算法比較結果 50 第五章 結論與未來展望 55 參考文獻 57 附錄 60

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