因現今網際網路的發達與分散式系統被廣泛的應用，網路上的流量隨之增大，但其穩定度尚未能被多數的使用者所接受。在本論文中，我們探討行動代理人在網際網路漫遊時，因遭遇到一些網路路由問題造成行動代理人不能順利前進到達指定的目的地，所以我們必須有一套尋找路徑的方法，來讓行動代理人能順利抵達終點。
因此我們提出了路由代理人 (Routing Agent) 路徑搜尋演算法和旅行代理人 (Traveling Agent) 路徑前進演算法，在旅行代理人不能順利前進時，提供多條路徑讓旅行代理人可以順利前進到達目的地。在網路不穩定的狀態下，路由代理人路徑搜尋演算法可以在一定的時間內找到路徑，因此提供了行動代理人一個穩定的路徑搜尋機制。

The internet have been extensively used now, the network loading is increasing rapidly, but the stability of network can not satisfy the requirement of most of the user. In this paper, we discuss when the mobile agent roams in the internet, it will suffer some network routing pathologies to cause the mobile agent not able to go forward to the destination smoothly. Therefore we must have a method of finding a path to enable the mobile agent to arrive at the destination smoothly.
We propose the routing agent (RA) path finding algorithm and the traveling agent (TA) path forwarding algorithm. When the traveling agent can not smoothly go forward, the path finding algorithm will provide multi-paths to enable the traveling agent to reach the destination successfully. Under the network unstable condition, the routing agent path finding algorithm will find the path in limited time. So this has provided the mobile agent a stable path finding mechanism.

中文摘要………………………………………………………………….i
Abstract…………………………………………………………………..ii
誌謝……………………………………………………………………...iii
目錄……………………………………………………………………...iv
圖目錄…………………………………………………………………..vii
表目錄………………………………………………………………….viii
第一章 緒論…..…………………………………………………………1
1.1 研究背景與動機…………………………………………….1
1.2 研究目的…………………………………………………….1
1.3 相關研究…………………………………………………….3
1.4 論文架構…………………………………………………….5
第二章 行動代理人系統簡介……..……………………………………7
2.1 行動代理人的定義………………………………………….7
2.2 行動代理人的基本要素…………………………………….9
2.3 行動代理人的優點………………………………………...11
2.4 行動代理人系統的應用…………………………………...12
2.5 行動代理人系統發展現況………………………………...14
第三章 系統架構及演算法設計…..…………………………………..17
3.1 相關網路通訊觀念………………………………………...17
3.1.1 自主系統………………………………………………17
3.1.2 網路控制訊息 (ICMP)………………………………..19
3.1.3 Ping 的工作原理………………………………………20
3.1.4 Traceroute的工作原理…………………………………20
3.2 行動代理人系統…………………………………………...21
3.2.1 系統模型………………………………………………21
3.2.2 名詞介紹………………………………………………23
3.3. 演算法設計………………………………………………..24
3.3.1 路徑成本考量…………………………………………24
3.3.2 假設與定義介紹………………………………………24
3.3.3 MAP與RA的資料規格表……………………………25
3.3.4 演算法說明……………………………………………26
3.3.5 例子……………………………………………………32
第四章 系統模擬…..…………………………………………………..36
4.1 模擬環境…………………………………………………...36
4.2 模擬項目與結果分析……………………………………...36
第五章 結論與未來研究方向……..…………………………………..45
5.1 結論………………………………………………………...45
5.2 未來研究方向……………………………………………...45
參考文獻………………………………………………………………..47
作者簡介………………………………………………………………..50

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