服務導向架構在近幾年甚受各國政府及民間企業的重視，使得具體實踐服務導向架構的網路服務機制受到的矚目每日愈增，導致各式各樣的網路服務如雨後春筍般相繼地推出。因為如此，具有相同或類似功能的網路服務出現百家爭鳴之態。然而，當前的網路服務架構與機制，無法判斷網路服務的品質孰優孰劣，使得服務需求者在挑選網路服務時眼花瞭亂，難以判斷何者才是最經濟實用且符合自己需求的網路服務。
　　因此，我們擴展現有的網路服務架構與機制，將服務需求者依網域分群，並且提出檢查服務品質的元件，佐以網路服務品質評價機制，一方面協助服務需求者挑選適合的網路服務，另一方面則幫助服務提供者建立服務品質監測機制。

　　While Web service models become increasingly popular and many service pro-viders start to offer all kinds of Web services, the quality of service (QoS) of Web ser-vices has become an important factor for service requesters to consider during the se-lection process of appropriate Web services. However, Web service brokers and other kinds of intermediaries in the current Web service architecture do not support QoS matchmaking mechanisms.
　　In our research study, we present an evaluation and selection model for Web ser-vices to resolve the QoS matchmaking problem. The main purpose of our model is to support service requesters to select suitable Web services based on the QoS re-quirements from requesters and trustworthiness of Web services candidates. To achieve this goal, in our service architecture we propose a novel mechanism to moni-tor and evaluate from request clients the physical usage condition of Web services and invent computation formulas for Web services reputation.

中文摘要......................................................................................................I
Abstract........................................................................................................II
誌謝..............................................................................................................III
Table of Contents.......................................................................................IV
Chapter 1 Introduction.................................................................................1
　1.1 Background and Motivation.............................................................1
　1.2 Outline of the Thesis.........................................................................3
Chapter 2 Related Works..........................................................................4
　2.1 UDDI Registry Augmentation..........................................................4
　2.2 SOA Expansion with Add-on Components...................................6
　2.3 Hybrid Architecture...........................................................................7
Chapter 3 Research Method.....................................................................12
　3.1 Architecture Description..................................................................12
　3.2 Service Judgment Mechanism and Computation Algorithms......18
　3.3 Usage Scenario................................................................................26
Chapter 4 Comparison and Discussion...................................................31
Chapter 5 Conclusion.................................................................................36
Bibliography................................................................................................37

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