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研究生:賴紀丞
論文名稱:多台應用代理伺服器中的分配機制
論文名稱(外文):A Dispatch Scheme in Multiple Application Proxies
指導教授:梅興梅興引用關係
學位類別:碩士
校院名稱:輔仁大學
系所名稱:資訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
中文關鍵詞:應用服務應用代理伺服器快取分配機制
外文關鍵詞:Application ServicesApplication ProxyCacheDispatch Scheme
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利用無線手持裝置來執行應用程式或是存取資料已經漸漸成為人們日常生活的一部分,而網際網路快取代理伺服器在這樣的需求下被廣泛地使用,網際網路快取代理伺服器常常被當作是傳統伺服器和使用者之間的一個溝通橋樑。但是在利用網際網路執行應用程式的環境之中,應用程式被固定在某些特定的伺服器或是代理伺服器之上,使得應用程式想要藉著Internet來傳播存在著種種的困難而不易實現。
在本篇論文中,我們提出了一個可以傳撥應用程式的基本網路架構,我們將它稱之為 ” Application Service Network ”,簡寫為 ASN。ASN 的運作模式和 CDNs (Content Delivery Networks) 中針對 Web content 的 Content Delivery Service 類似;主要的不同點在於 ASN 提供了存取應用程式服務以及運算的功能。在本研究中,我們利用多台的應用代理伺服器建構了一個 ASN 網路架構雛型,其中我們又提出了一個分配的機制 ---- Dynamic Dispatch Scheme 來負責分配使用者的要求。從實驗的結果顯示,Dynamic Dispatch Scheme 不僅可以縮短使用者的反應時間而且可以平衡各個伺服器的負擔。一般來說,在使用者反應時間上 Dynamic Dispatch Scheme 與 Random Dispatch 相較下縮短了78% 、與 Round Robin Dispatch 相較下縮短了73%,與 Basic Case 相較下縮短了60%。

Accessing applications through wireless hand-held device become part of the daily life recently. The proxy cache architecture is also widely used for the web content. Proxy caches are used as smart intermediaries between traditional servers and heterogeneous mobile clients. Since most of applications are dedicated to the server or special proxies, applications are difficult to be distributed on Internet.
In this thesis, we propose an application delivery service framework called “Application Service Network” (ASN). ASNs are working similarly to Content Delivery Service in CDNs (Content Delivery Networks) for web content. ASN differs CDN with the additional application service accessing and computation capabilities. In this research, we use application proxies to construct a prototype network. A dynamic dispatch scheme is designed to select proxy for different application services in ASN. From the results of test-bed experiments, the dynamic dispatch scheme could not only improve the average response time for client, but also balance the loads of multiple proxies. In general, the dynamic dispatch scheme reduces up to 78% average response time than Random dispatch, 73% than Round Robin dispatch, and 60% than Basic case.

Chapter 1. Introduction
Chapter 2. Related Works
2.1 Content Delivery Networks (CDN)
2.2 CDN & ASN
2.3 Open Pluggable Edge Services (OPES)
2.4 Cluster Architecture & Dispatch Algorithm
Chapter 3. ASN Architecture
3.1 Basic Components of ASN
3.2 Application Service
3.3 Request Type
3.4 Workflow of ASN
3.5 Dynamic Dispatch Scheme
3.6 An Operation Example of ASN
Chapter 4. ASN Test-bed Analysis
4.1 Proxy Selection Schemes
4.1.1 Basic case
4.1.2 Random Request
4.1.3 Round Robin
4.1.4 Dynamic Dispatch Scheme
4.2 Response Time
4.3 Algebraic Expressions
Chapter 5. Experiment and Analysis
5.1 Experiment Environment
5.2 Evaluation
Chapter 6. Conclusion and Future Work
Reference

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