網際服務（Web Services）的技術在各種領域廣泛的應用，隨著越來越多組織將網際服務發布到網路上，針對相同功能或相似的網際服務使用者可以選擇的服務種類也越來越多，但它們所提供的服務品質（Quality of Service, QoS）卻不盡相同，因此，網際服務品質的描述和評估是使用者選擇服務時非常重要的部份，而目前對服務品質的描述沒有一個完整的描述語言，因而無法實現一個基於品質的服務搜尋，本文希望分析服務品質的特點，建立出網際服務品質的描述模型，利用網路本體語言（Web Ontology Language, OWL）提出一種網際服務品質的描述語言，並對服務品質的屬性綜合評估，提出服務品質計算方法，有效幫助使用者對功能相似服務的選擇。由於現有的網際服務架構並不支援服務品質，本文將對現有的網際服務模型進行擴展，增加註冊代理角色、尋找-選擇-監測代理角色與品質認證中心，提出一個改進的網際服務發布、搜尋的過程，使得架構上能支援含有服務品質訊息的服務描述，提出一套有效的服務品質管理機制。

As the Web Service technology becomes more and more popular, and the numbers of applications of Web Service grow rapidly, Quality of Service (QoS) of Web Service has become a very important factor for differentiating similar Web Service. So we need mechanisms to describe QoS. This thesis firstly analyzes characteristics of quality of Web Service and points out shortcomings of current service description, then a QoS semantic description model for Web Service was defined. The QoS semantic description model of Web Service is in the forms of Web Ontology Language (OWL). This thesis also proposes an algorithm to evaluate quality of Web Service, this algorithm computes each Web Service’s synthetic evaluation value. In this way, the best service from many Web Services can be selected and provided to the client.
In current SOA environment, registration and discovery for Web Service only support functional description but cannot support QoS description. Thus, this thesis proposes an extended model for Web Service supporting QoS description. In such environment, Registration Agent, Find-Select-Monitor Agent and QoS Verifier are introduced. These parts achieve the effective management of Web Service with QoS information.

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