博碩士論文 etd-0115106-113824 詳細資訊

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姓名 白鎔碩(Jung-shuo Pai) 電子郵件信箱 js.pai.tw@gmail.com
畢業系所 資訊管理學系研究所(Information Management)
畢業學位 碩士(Master) 畢業時期 94學年第1學期
論文名稱(中) 一個以機率為基礎之網路服務選擇方法
論文名稱(英) A Probability-based Approach to Web services Selection
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    摘要(中) 隨著網際網路使用人口的增加，各式各樣以標準化科技為基礎的網路服務也透過網際網路來提供給使用者。然而，隨著市場變的更為競爭，單元性的網路服務已經不足以滿足使用者的需求，以網路服務為基礎之工作流程的概念也隨之而生。以網路服務為基礎之工作流程是由數個相關的活動所組成，用以達成特定的任務。其中，每一項活動皆有一組候選的網路服務可供選擇。其目標是去作出一個能最佳化整個工作流程服務品質的選擇組合。雖然有許多方法已經被提出來解決這個以服務品質為基礎的網路服務選擇問題，大部分的方法都是基於靜態的服務品質模型，此種模型並無法確實的反映出真實的服務品質，所以根據此種模型的方法不一定能夠得到最佳的解。因此，在本篇論文中，我們採取了一個以機率為基礎的模型，它是以機率質量函數作為服務品質的模型，並且提出了一個以分支界定策略為基礎之演算法來選擇網路服務。在此服務品質模型的前提下，目標是去最大化滿足服務品質目標與限制之機率值。根據實驗結果，採取以機率為基礎的模型所得到的解可以有更高的機率讓工作流程達成服務品質的目標。
    摘要(英) As the population of the Internet users increases, various Web services, which are based on a set of standardized technologies, are now offered through the Internet. However, as the market becomes more competitive, atomic Web services are not sophisticated enough to meet users’ needs, and the concept of Web services-based workflow emerges accordingly. Web services-based workflow is a workflow composed of several related activities, aiming to achieve certain task, and for each activity, there can be a set of candidate Web services to be selected. The goal is to make a selection, which optimizes the QoS of the entire workflow. Although numerous methods are proposed to solve this QoS-based Web services selection problem, most of them are based on a static QoS model, which cannot accurately reflect the real QoS measures, and as a result, methods based on this static model will not necessarily derive the optimal solution even in the average case. Therefore, in this thesis, we adopt a probability-based model, which represents QoS measures as probability mass functions, and propose a branch and bound algorithm for selecting Web services from a set of candidate Web services. Under this QoS model, the goal is to maximize the probability of meeting the QoS goal subject to some QoS constraints. As demonstrated by the results of our experiments, it is much more probable for a workflow to meets the QoS goal by executing the selection derived by the probability-based approach.
    關鍵字(中)
  • 工作流程
  • 網路服務為基礎之工作流程
  • 網路服務
  • 以機率為基礎的網路服務選擇
    		• 關鍵字(英)
  • Workflow
  • Web services-based workflow
  • Web services
  • Probability-based Web services selection
    • 論文目次 CHAPTER 1. INTRODUCTION 1
    1.1. BACKGROUND 1
    1.2. MOTIVATION 4
    1.3. THESIS ORGANIZATION 6
    CHAPTER 2. LITERATURE REVIEW 7
    2.1. WEB SERVICES TECHNOLOGIES 7
    2.2. PROCESS MODELS AND WEB SERVICES COMPOSITION 10
    2.3. QOS MODELS 16
    2.4. QOS-BASED WEB SERVICES SELECTION 18
    CHAPTER 3. PROBLEM DEFINITION 20
    3.1. PROBLEM OVERVIEW 20
    3.2. THE PROCESS MODEL 21
    3.3. PROTOCOL COMPATIBILITY AND REPLACEABILITY 26
    3.4. THE PROBABILISTIC QOS MODEL 30
    3.5. THE PROBABILISTIC QOS CONSTRAINT AND GOAL 32
    CHAPTER 4. ALGORITHMS FOR WEB SERVICES SELECTION 35
    4.1. BRUTE FORCE METHOD 35
    4.2. PRUNING TECHNIQUES 35
    4.3. EXPLORING THE SOLUTION SPACE 40
    CHAPTER 5. EXPERIMENTATION 53
    5.1. EXPERIMENT DESIGN 53
    5.2. PARAMETER SETTINGS 54
    5.3. EXPERIMENT RESULTS 56
    CHAPTER 6. CONCLUSIONS 61
    REFERENCES 63
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  • 楊婉秀 - 委員
  • 黃三益 - 指導教授
    • 口試日期 2005-06-30 繳交日期 2006-01-15

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