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Cloud computing has emerged as the primary and popular computing paradigm recently. Since cloud users move continuously, sustaining the required quality of service (QoS) in a cost effective manner is very challenging. For maintaining the required QoS for a moving user, the current cloud systems use some of the existing service replication or/and migration strategies. However, those policies become...
With the fast development of Social Networking Services, there has been increasingly vast amount of information published by massive network users. Given this information explosion, how to analyze the quality of User Generated Contents (UGC) automatically becomes a challenging task for researchers. To solve the problem, we need to build an effective UGC quality evaluation system. In the light of our...
Cell range expansion (CRE) has emerged as a promising technique to improve spectral and energy efficiency (EE) in heterogeneous networks (HetNets). In this study, a resource allocation (RA) problem for maximising the EE is formulated with the considerations on CRE and cross-tier interference coordination (CTIC). Owing to the forms of the objective function and the constraints, the optimisation problem...
Multimedia MPSoC (Multi-Processor System-on-Chip) has been widely used in today's consumer electronics. As many memory intensive IP (Intellectual Property) cores are integrated into a single chip, the performance of shared memory has been a critical issue. Conventional memory scheduling policies just schedule the existing requests in the queue and waste the potential scheduling space because they...
With the advent of service-oriented computing, the issue of trust and Quality of Service (QoS) have become increasingly important. In service-oriented environments, when there are a few service providers providing the same service, a service client would be keen to know the trustworthiness of each service provider in the forthcoming transaction. The trust rating of a delivered service from a service...
For a multiuser cognitive OFDM network, most existing adaptive resource allocation methods focus solely on fixed data-rate requirement (QoS guaranteed) or variable data-rate (no QoS guaranteed) conditions without any fairness consideration. In this paper, we investigate the resource allocation problem in a heterogeneous cognitive network with different QoS requirements. By decomposing the problem...
Trust is a critical issue in e-commerce and e-service environments. In some applications (such as eBay), the trust management mechanisms have been introduced to provide valuable information to buyers prior to placing orders and making payments. Meanwhile, the trust issue is also actively studied in the research community. However, most studies and applications focus on approaches that result in a...
With the integration of Web Services as a business solution in many enterprise applications, the quality of service (QoS) presented by Web services is becoming the main concern of both service providers and clients. QoS requirements are recorded as part of the bi-lateral service-level agreement (SLA). In an open and service-oriented market, it is crucial to establish trustable SLA compliance monitoring...
Quality of service (QoS) plays a key role in Web services. In an open and volatile environment, a provider may not deliver the QoS it declared. Hence, it's necessary to provide a QoS assessment model to determine the likely behavior of a provider. Although many researches have been done to develop models and techniques to assist users in QoS assessment, most of them ignore various QoS requirements...
In this paper, we develop a resource allocation and admission control scheme for multimedia services downlink transmission in a multiple parallel time-varying subchannels circumstance such as that in current orthogonal frequency division multiplexing (OFDM) and multi-input multi-output (MIMO) systems. We introduce the outage probability to characterize the influence of both the bursty nature of multimedia...
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