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In embedded system development, a crucial task is to reduce the maximum power consumption owing to power source limitations while maximizing the quality of service. The tradeoff between power consumption and quality of service needs to be resolved. If software can change its power consumption in accordance with the power consumption of hardware, it can reduce the maximum power consumption while increasing...
Heterogeneous data traffic is increasingly becoming a complex mix of both delay tolerant and intolerant IP traffic. Optical Burst Switched (OBS) networks have since become a backbone network solution to handle the resultant zetabyte volumes of such traffic concurrently using the burst assembly and transmission approach. The strict minimum burst size constraint requirements as well as varying maximum...
Performance is one of the main aspects that should be taken into consideration during the design, development, tuning and optimisation of computer networks supported by cloud computing platforms (CCPs). Queueing network models (QNMs) of CCPs constitute essential quantitative tools of investigation towards identifying acceptable levels of quality-of-service (QoS), whether for upgrading an existing...
Clouds offer great flexibility for scaling applications due to the wide spectrum of resources with different cost-performance, inherent resource elasticity and pay-peruse charging. However, determining cost-time-efficient cloud configurations to execute a given application in the large resource configuration space remains a key challenge. The growing importance of elastic applications for which the...
For P2P systems, one of the key challenges is to motivate peers to contribute to the system by sharing authentic files. Since the peers differ from each other in the quantity and quality of services they provide for the system, service differentiation is necessary for the sake of fairness. In this paper, a multidimensional contribution-based service differentiation mechanism is proposed. We first...
The development of delay sensitive applications needs massive data storage and computing resources, especially in a typical cloud environment. The cloud computing paradigm provides a broad range of services viz. software, platform, and infrastructure for various applications (both real-time and non real-time) over the Internet. But, in the case of Infrastructure-as-a-Service (IaaS) cloud platform,...
Different from the traditional web services, the big data services' execution duration vary from the input data volume, so the traditional Quality of Service (QoS) analysis model for traditional web services cannot be directly applied to big data services. Additionally, since many big data or web services provide overlapping or identical functionality, albeit with the description of different QoS,...
Proliferation of mobile digital devices has posed major challenges for design and implementation of Wireless Local Area Networks (WLANs), leading to stringent quality of service (QoS) requirements. Extreme burstiness and correlation characteristics of multimedia traffics generated by digital devices require accurate modelling and analysis to provide satisfactory end user experience. Most existing...
Self-adaptive systems (SAS) have the ability to achieve functional and/or quality of service objectives by automatically modifying their behavior at runtime. Accordingly, each self-adaptive system typically consists of a managed system dealing with the domain concerns, and a feedback loop handling adaptation concerns of the managed system. In the aim to promote the actual use of these systems, it...
Software Defined Networking (SDN) is emerging as a new paradigm in which the control plane is decoupled from the data plane. SDN architectures enable the abstraction of network elements from the chaos of infrastructures to be service resources. The deployment of applications and network services can be largely simplified by taking advantage of the standardized open Application Program Interface (API)...
The objective of this paper is to propose the rule-based algorithmic approach for solving problems of faults influence on the service quality in access networks. In this paper the graph oriented model for network and communication services representation, the rule-based system and corresponding output mechanism, the algorithms for the faults impact analysis based on graph traversal schemes are proposed...
The exponential growth of internet traffic over the last twenty years presents a real challenge to ISP looking to ensure a reliable and efficient service to their customers. Network traffic is far from being straightforward to predict and a deep understanding of the routing domains is a first requirement to achieve proper management of the traffic. This paper focuses on the monitoring and characterisation...
To provide differential quality-of-services (QoS) in multimedia networks, an optical code-division multiple-access (O-CDMA) technique with power control in variable-weight codes has been studied. In this paper, a simplified bit-error-probability model and a new analytical model of the system capacity of such a multimedia O-CDMA network are formulated. Using the new models, the relationship of code...
Wireless channels in millimeter wave based wearable networks are particularly susceptible to environmental blockages and dynamics when there are humans/objects in motion. Such dynamics imply, not only physical layer overheads to discover and track viable transmission paths, but also MAC overheads to keep track of neighboring interferers, perform clustering and enable proper scheduling of transmissions...
Today, many large usages of computer systems, cloud computing, high-performance networks and their connections through networks are available electronically and they rapidly increased. These large-scale networks are fault tolerant and require a repairmen policy for maximising Quality of Service (QoS). However, obtaining QoS of large-scale networks analytically is difficult due to the state space explosion...
With the emerging vehicular network and the possible diverse applications, Intelligent Transportation Systems (ITS) have been evolving to Cooperative ITS (C-ITS, CITS) with connected intelligent vehicles, and the topics in this domain also raise more and more research interesting recently. However, subjecting to the immaturity of V2X communication technology and the deployment of intelligent vehicles...
The playout buffer occupancy of a mobile user watching a video on a cellular wireless network is modeled analytically as Markov fluid queue. The probability of video freeze that is observed upon buffer drain is computed depending on adaptive playout rate, rate adaptation threshold and pre-play buffering. An optimization problem concerning these three parameters is formulated.
Isolating fine-grained business functionalities byboundaries into entities called microservices is a core activityunderlying microservitization. We define microservitization asthe paradigm shift towards microservices. Determining theoptimal microservice boundaries (i.e. microservice granularity) is among the key microservitization design decisions thatinfluence the Quality of Service (QoS) of the...
Cloud data centers (CDC) are an integral part of today's internet services. Enterprises and Businesses around the world rely heavily on data centers for their daily computation and IT operations. In fact, every time we search for an information on the internet, or we use an application on our smartphones, we access data centers. In CDC, most compute resources are represented as virtual machines (VMs)...
Quality-of-Service attributes such as performance and reliability heavily depend on the run-time conditions under which software is executed (e.g., workload fluctuation and resources availability). Therefore, it is important to design systems able to adapt their setting and behavior due to these run-time variabilities. In this paper we propose a novel approach based on queuing networks as the quantitative...
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