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Cloud computing is a type of parallel and distributed system for dynamically provisioning on-demand services. Customers and enterprises can employ cloud services including software, platforms and infrastructure to improve the scalability of their services and handle stochastic demands from users. However, random arrival tasks from users have different load sizes and deadline requirements that need...
We consider the problem of serving a set of sensors/end-users at multi-level quality of service. Consider for example the problem, which arises in augmented reality applications, of single-hop radio broadcasting a common content from a provider. Each end-user requires a minimal quality level of the common content. The provider must satisfy all end-users at their required minimal quality level with...
Energy efficiency and green communication have been a hot research topic in ICT industry recently. For cellular networks, the energy cost of base stations (BSs) makes a huge proportion of the total cost. This paper concentrates on finding an approach to shut down BSs with low traffic load from active mode to sleeping mode. QoE, instead of QoS, is guaranteed in this paper. Since different service types...
The ad-hoc mobile markets are increasing daily with providers and consumers ready to participate in these markets. Issues like service discovery and selection are major challenges in these markets. As these markets grow, researchers are working on discovery while little is done on selection. Most scholars have developed different selection mechanisms considering only consumer's quality of service...
In recent years, cloud storage providers have gained popularity for personal and organizational data, and provided highly reliable, scalable and flexible resources to cloud users. Although cloud providers bring advantages to their users, most cloud providers suffer outages from time-to-time. Therefore, relying on a single cloud storage services threatens service availability of cloud users. We believe...
The thermal-aware service rate assignment problem is a major challenge in cyber-physical systems. This problem is complex because of the severe temperature changes in uncertain physical environments and variable power consumption for each application, and these two effects might cause the system to overheat. This study proposes a dynamic-programming based service rate assignment with a feedback control...
Botnets have become the top threat to Internet security. Botnets generate and transmit huge amounts of malicious traffic for various purposes. In this paper, we propose a dynamic programming based algorithm to calculate a set of appropriate routers for placing early filters of malicious traffic in the network in order to maximize the benefits of early malicious traffic filtering. Moreover, we discuss...
Data grids support distributed data-intensive applications that need to access massive datasets stored around the world. Ensuring efficient access to such datasets is hindered by the high latencies of wide-area networks. To speed up access, files can be replicated so a user can access a nearby replica. Much of the work on the replica placement problem in data grids has focused on average system performance...
Data Grids provide services and infrastructure for distributed data-intensive applications accessing massive geographically distributed datasets. An important technique to speed access in Data Grids is replication, which provides nearby data access. Much of the work on the replica placement problem has focused on average system performance and ignored quality assurance issues. In a data grid environment,...
Automatic service composition has been an active research area in the field of service computing. Service engineers demand algorithms that not only synthesize the correct work plans but also meet the need of the overall qualities like response time, throughput, fee, etc. In this paper, we present a novel QoS-aware approach which adopts a two-phase graph search algorithm. This approach effectively...
A new way to study reliability-based service composition. First, an interference model is proposed to quantitatively characterize and measure the interference. Then, based the model, we present a minimum interference service composition and recovery algorithms (MISCR) by exploiting the local path recovery and reliable service paths. The experimental results show that our model and algorithms can achieve...
The problem of allocating power over a non-ergodic Gaussian block fading channel is addressed for delay constrained applications, where transmission takes place over a limited number of time slots. We propose an algorithm in which the transmission power is determined at each time slot based on the channel condition at the current and future time slots, where a Markov model is used to capture the correlation...
The future Internet would benefit from the delivery of high performance services crossing several carriers and bringing new incomes to telco operators. Such services compel carriers to guarantee quality of service (QoS) inside their boundaries. As carriers are independently administrated, architectures and processes must be reconsidered so that requirements for autonomy and confidentiality are respected...
Automatic service composition has been a hot topic in both academia and industry. It begins with syntactic composition, and then evolves semantic description. QoS of the composition comes into researcherspsila mind, which aims at meeting the need of the overall qualities like service fee, response time, throughput, etc. In this paper, a novel QoS-aware approach is presented. It adopts a forward filtering...
With the advent of high bandwidth third-generation mobile networks and other wireless networks, grid computing has migrated from traditional parallel and distributed computing to pervasive and utility computing based on the wireless networks and mobile devices, which results in the emergence of a new computing paradigm named mobile grid. Data replication is widely used in mobile grid environments...
In this paper we consider multi-hop wireless mesh networks intended to provide Internet connectivity to both end users and hotspots. In such networks mechanisms for provisioning QoS for delay sensitive flows arise as an important topic. In this context, we focus on the non-bifurcated (single path) routing of such flows as a means of allowing all packets in any flow to receive uniformly controlled...
We develop an economic model for networks offering tiered services and we formulate the problem of selecting the service tiers from three perspectives: one that considers the users' interests only, one that considers only the service provider's interests, and one that considers both simultaneously, i.e., the interests of society as a whole. We also present dynamic programming algorithms that solve...
We investigate a power-controlled transmission scheme for streaming media traffic over wireless links. The server (source) transmits encoded media packets to a client (user) over a fluctuating wireless channel. The client stores received packets into a fixed-size buffer and plays them out at a constant rate. Due to random channel interference, the source needs to adapt its transmission power and rate...
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