在預(yù)算資源有限且不需在計(jì)算機(jī)和網(wǎng)絡(luò)硬件花費(fèi)過(guò)多經(jīng)費(fèi)的條件下,為了對(duì)師生提供有效地學(xué)習(xí)和教學(xué)服務(wù),云計(jì)算環(huán)境是教育機(jī)構(gòu)開(kāi)發(fā)教學(xué)和學(xué)習(xí)系統(tǒng)一個(gè)非常好的選擇。同時(shí),它也是當(dāng)前在教學(xué)和學(xué)習(xí)方面帶來(lái)巨大影響的技術(shù)之一。云提供了能夠在任意地方、任何時(shí)間訪問(wèn)的豐富教學(xué)工具。學(xué)生和老師借助于標(biāo)準(zhǔn)瀏覽器能夠在具有因特網(wǎng)接入功能的設(shè)備上訪問(wèn)云資源。通過(guò)標(biāo)準(zhǔn)瀏覽器,學(xué)生和老師能夠訪問(wèn)功課內(nèi)容、背景材料、測(cè)試和課程指定的應(yīng)用等。使用云環(huán)境,任何高等機(jī)構(gòu)能夠創(chuàng)立一個(gè)綜合的在線環(huán)境為身在各個(gè)地方或國(guó)家的學(xué)生提供相同質(zhì)量的內(nèi)容和資源。云平臺(tái)也能夠?yàn)閷W(xué)生提供重要資源,比如書(shū)寫(xiě)的內(nèi)容、供老師上課和實(shí)驗(yàn)用的音視頻材料等。由于教學(xué)和學(xué)習(xí)系統(tǒng)是部署在云端,這個(gè)系統(tǒng)能夠常規(guī)測(cè)試,以加強(qiáng)在數(shù)學(xué)、化學(xué)、物理、計(jì)算機(jī)和工程等課程上的新信息和課程指定的應(yīng)用等,從而幫助學(xué)生實(shí)踐在課堂中所學(xué)到的技能。 高可用性系統(tǒng)的目標(biāo)是維持全時(shí)間的可用性,并阻止因斷電、硬件失效和系統(tǒng)更新的服務(wù)崩潰。所有的這些有助于避免除異常情況外的系統(tǒng)低可用性和失效性。為了確保云環(huán)境中系統(tǒng)的高可用性,并且保持客戶端在最小響應(yīng)時(shí)間內(nèi)能夠訪問(wèn)系統(tǒng)資源,將常用資源復(fù)制到附近...

【文章頁(yè)數(shù)】：122 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
Acknowledgments
Abstract
中文摘要
CHAPTER 1. INTRODUCTION
    1.1 Cloud Computing
        1.1.1 Types of Cloud Computing Services
        1.1.2 Cloud Service Providers
        1.1.3 Deployment Models
    1.2 Teaching and Learning System in Cloud
        1.2.1 Cloud-based Teaching and LearningTools
        1.2.2 Cloud Computing Benefits
        1.2.3 Challenges and Solutions
    1.3 Availability in Cloud
        1.3.1 Redundancy through Replication
        1.3.2 Load Balancing Techniques
    1.4 Motivation of the Research
    1.5 Statement of the Problem
    1.6 Objectives of the Research
    1.7 Significance of the Research
    1.8 Scope of the Research
    1.9 Organization of the Thesis
CHAPTER 2. LITERATURE REVIEW
    2.1 Web-based Teaching and Learning System
        2.1.1 Functional Components in Web-based Teaching and Learning System
    2.2 Cloud-based Teaching and Learning System
        2.2.1 Cloud-based Teaching and Learning Architecture
        2.2.2 Benefits of the Cloud-based Teaching and Learning Architecture
    2.3 Fault Tolerance Technology in the Cloud
        2.3.1 Virtualization Fault Tolerant Methodology
    2.4 Summary
CHAPTER 3. PRELIMINARIES
    3.1 Key Concepts and Definitions of Availability
        3.1.1 Instantaneous (or Point) Availability, A(t)
        3.1.2 Steady-state Availability, A(∞)
        3.1.3 Inherent Availability, AI

        3.1.4 Average Up-time Availability (or Mean Availability), A
        3.1.5 Achieved Availability, A_A

        3.1.6 Operational Availability, A_o

        3.1.7 Causes of unavailability
    3.2 Cloud Data Replication
        3.2.1 Array-based Replication
        3.2.2 Network-based Appliances Replication
        3.2.3 Host-based Replication
        3.2.4 Synchronous Replication
        3.2.5 Asynchronous Replication
    3.3 Related Essentials of Redundancy in Cloud
        3.3.1 Snapshots
        3.3.2 Hardware RAID
        3.3.3 Erasure coding Vs. Replication
    3.4 Load Balancing in Cloud
        3.4.1 Static Load Balancing Algorithms
        3.4.2 Dynamic Load Balancing Algorithms
    3.5 Summary
CHAPTER 4. HIGH AVAILABILITY ASSURANCE REPLICATION STRATEGY
    4.1 System Model and Assumptions
        4.1.1 Modeling Block Availability
        4.1.2 Mode ling File Availability
        4.1.3 Characterizing Node Availability
    4.2 Proposed High Availability Assurance Replication Strategy
        4.2.1 Which data files and When to Replicate
        4.2.2 Determining the Number of New Replicas
        4.2.3 How to Place New Replicas in Cloud Storage
        4.2.4 High Availability Assurance Replication Algorithm
    4.3 Simulations and Performance Analysis
        4.3.1 Simulation Environment and Parameter Setup
        4.3.2 Performance Evaluation
    4.4 Summary
CHAPTER 5. EFFICIENT LOAD BALANCING APPROACH FOR VIRTUALMACHINES IN CLOUD ENVIRONMENT
    5.1 Mathematical Formulation of Job Allocation Problem on Various VMs
    5.2 Proposed Virtual Machine Load Balancing Algorithm
    5.3 Experimental Setup and Results
    5.4 Summary
CHAPTER 6. CONCLUSION AND FUTURE WORK
    6.1 Conclusion
    6.2 Future Work
REFERENCES
Extended Abstract
中文擴(kuò)展摘要
Research Achievements during the Period of Study
    Publication
    Research Projects during Master's Degree Program



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