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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

QoS Representation, Negotiation and Assurance in Cloud Services

Zheng, Xianrong 20 February 2014 (has links)
Cloud services are Internet-based IT services. Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS) are three representative examples. As the cloud market becomes more open and competitive, Quality of Service (QoS) will be more important. However, cloud providers and cloud consumers have different and sometimes opposite preferences. If such a conflict occurs, a Service Level Agreement (SLA) cannot be established without negotiation. To allow service consumers to express their QoS requirements, and negotiate them with service providers, we argue for cloud service negotiation. It aims to establish and enforce SLAs for cloud services. Specifically, we study how to measure, negotiate, and enforce QoS requirements for cloud services, and so formulate three research problems, i.e., QoS measurement, QoS negotiation, and QoS assurance. In terms of its scope, the topic covers business side automated negotiation and technical side resource allocation techniques. As a result, it has a potential impact on cloud service adoption. To address QoS measurement, we initiate a quality model named CLOUDQUAL for cloud services. It is a model with quality dimensions and metrics that targets general cloud services. CLOUDQUAL contains six quality dimensions, i.e., usability, availability, reliability, responsiveness, security, and elasticity, of which usability is subjective, whereas the others are objective. To address QoS negotiation, we present a mixed negotiation approach for cloud services, which is based on the “game of chicken”. In particular, if a party is uncertain about the strategy of its counterpart, it is best to mix concession and tradeoff strategies in negotiation. In fact, the mixed approach, which exhibits a certain degree of intelligence, can achieve a higher utility than a concession approach, while incurring fewer failures than a tradeoff approach. To address QoS assurance, we propose a QoS-driven resource allocation method for cloud services. It can meet users’ QoS requirements while minimizing resources consumed. Especially, to honor a QoS specified in a SLA, we develop QoS assurance mechanisms, and determine the minimum resources that should be allocated. As a result, the method makes both technical and economic sense for cloud providers. / Thesis (Ph.D, Computing) -- Queen's University, 2014-02-20 14:26:06.616
2

Bridging the Broadband Divide through Universal Service Funds : Key Principles for Broadband Connectivity Projects in Underserved Areas

Joshi, Raoul, Hammarström, Fredrik January 2013 (has links)
The rapid emergence of broadband, or always-on Internet, during the course of the last decade, has increased the importance of the so- called information society in urban and industrialized societies world- wide. Liberalized information and communications technology (ICT) market forces worldwide have however failed to supply these services to rural and low-income regions resulting in the so-called digital divide. One financial tool, adopted by many developing nations to drive broadband investments in underserved areas, is the universal service fund (USF), a public fund mainly levying its resources from ICT market players. USFs have previously been used to fund telecom networks but with the growing importance of broadband, structural and regulatory discrepancies are preventing USFs from adequately supporting broadband investments. Currently, little up-to-date academic theory exists within this field; thus, this thesis serves to outline principles that policy-makers and regulators need to consider when designing or reforming universal service fund mechanisms. The research is based on a series of qualitative country case studies investigating policy, procedural, and executional aspects related to USFs and rural broadband. Publicly available material has been complemented with interviews of stakeholders from various levels to establish a holistic empirical base upon which conclusions have been drawn. The conclusions outline principles governing public involvement in USFs, roles played by various stakeholders in the broadband ecosystem, and strategies for rural broadband network deployment. / Framfarten av bredband under det senaste årtiondet har ökat vikten av det så kallade informationssamhället i de industrialiserade och urbaniserade samhällen. Marknadskrafterna inom den liberaliserade informations- och kommunikationsindustrin har dock misslyckats med att göra dess tjänster tillgängliga till glesbefolkade och låginkomstregioner, vilket har lett till en digital klyfta. Ett finansiellt hjälpmedel som många utvecklingsländer har anammat för att påskynda bredbandsinvesteringar i regioner med få bredbandsuppkopplingar är fonder för samhällsomfattande tjänster (USF), som är en offentlig fond vilken får den största delen av sitt kapital genom en pålaga på intäkterna från aktörer inom informations- och kommunikationsindustrin. USF:er har tidigare använts för att finansiera telekomnätverk, men i takt med att bredbandets ökande genomslag i samhället har strukturella och regleringsmässiga problem med USF:erna uppdagats vilka hindrar dem från att effektivt stödja bredbandsinvesteringar. För närvarande finns lite akademisk teori på området, och sålunda syftar denna uppsatts till att tillhandahålla principer vilka beslutsfattare och regulatorer bör efterfölja vid utformning eller reformering av mekanismer för samhällsomfattande tjänster för bredband. Arbetet baseras på en serie kvalitativa fallstudier av länder med policy, procedurella och verkställande aspekter kopplade till USF:er i områden med få bredbandsuppkopplingar i fokus. Material tillgängligt för allmänheten har kompletterats med intervjuer av intressenter från olika organisations- och samhällsnivåer för att skapa en heltäckande empiri på området från vilka slutsatser har dragits. Slutsatserna innehåller principer som rör offentlig inblandning i USF:er, roller för samhällets olika intressenter i ett ekosystem för bredband, samt strategier för utbyggnad av bredbandsnätverk i glesbefolkade områden.

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