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Performance evaluation of faculty members in a higher education is a serious challenge for management. Several qualitative and quantitative factors are considered leading to targeted professional growth of an organization to evaluate the performance, such as acquiring research grants, research profile, student evaluation, publications, academic responsibilities etc. However, to quantify such information...
Software Defined Networks are intended to be less complex, more flexible, and free of vendor-lock-ins. Therefore the Software Defined Networking (SDN) instantiation OpenFlow has been designed according to these properties. The efforts are expected to result in lower expenditure and operational costs. To reach these objectives, mechanisms of classical networks that provide established functionalities...
In ubiquitous stub environments, it is a critical challenge to select an optimal set of devices to accomplish a graph-based ubiquitous service and execute it continuously. The mobility of devices, the diverse access technologies and underlying path quality have a great influence on the user experience. Thus, we put forward a hierarchical model and a novel selection function considering the synergetic...
According to increasing performance of mobile devices, like smart phone, tablet PC and etc, and diffusing network infrastructures, like LTE, WiFi and etc, various types of content delivery services based on PC services can serve into mobile devices using cloud. In this paper we proposed content delivery framework with SDN (Software Defined Networking) and CCN (Content Centric Networking) to improve...
We present in this paper a stochastic flow-level network model for the performance evaluation of IP networks with multiple bottlenecks supporting short-lived and long-lived TCP flows. Flow-level network models are efficient at estimating the mean bandwidth of TCP flows in various topologies, but they are generally limited to the study of infinite flows. This paper extends such models in order to evaluate...
The Long Term Evolution (LTE) standard plays an important role in the development of Machine-to-Machine (M2M) communication. However, the M2M communication has several different characteristics regarding to Human-to-Human (H2H) communication. Therefore, the shortage of radio resources, satisfaction of the Quality of Service (QoS) requirements and the reduction of the H2H traffic performance are important...
Energy efficient operation of cellular systems becomes a core design goal for economic and environment-friendly network operation. Several studies have shown that the energy consumed in base stations represents 60–80% of the energy consumption in cellular networks. In this paper, we develop an optimization framework that exploits several energy efficient techniques including switching power modes...
In this study, the discrete-time performance of BLUE algorithms under bursty and correlated traffics is analyzed using two-state Markov-modulated Bernoulli arrival process (BLUE-MMBP-2). A two-dimensional discrete-time Markov chain is used to model the BLUE algorithm for two traffic classes, in which each dimension corresponds to a traffic class and the parameters of that traffic class. The MMBP is...
Device-to-Device (D2D) communications can efficiently support the growth in mobile data traffic by offloading part of the traffic from the cellular infrastructure. D2D communications are influenced by the propagation conditions between mobile devices that depend on the antenna heights, presence of obstacles, and mobility of devices. Analytical and simulation studies have shown that link-aware opportunistic...
The constant evolution and growth of multimedia applications supported by today's mobile devices leads to an increase on the demand for video based services which impose new requirements in terms of bitrate and delay. In order to face these challenges, LTE appears as a technology capable of dealing with the video traffic load on mobile networks. However, given the inherent nature of mobile networks...
One of the solutions to overcome the network congestion issue over the WAN is to deploy QoS. However Service Provider rarely utilized the QoS function to avoid any implication on the network because it requires high maintenance and attention from network administrator. Usually they would propose customers to add more bandwidth due to congestion but it would only resolve the congestion issue temporarily...
This paper presents a solution to performance issues in the quality of service aware selection of Web services using techniques of parallelism and mechanisms of inference provided by Semantic Web. The results point to a significant improvement in the speed of searching Web services and thus makes the use of semantic resources viable in distributed systems to provide better quality of service to the...
Performing functionality testing in serviceoriented architectures is not a trivial task. The difficulty is especially the large number of components that may be present in a SOA such as brokers, providers, service registries, clients, monitoring tools, data storage tools, etc. Thus, in order to facilitate the process of conducting functional testing and capacity planning in service-oriented systems,...
This paper analyzes the execution behavior of web services on devices with limited resources. The experiments compare web services in the Axis2 and CXF frameworks analyzing performance and power consumption. To determine which framework is better suited for service provision, a testing environment and a performance and energy evaluation between them are presented. We show that the Raspberry Pi can...
Real time video transmission over wireless networks is very challenging due to the time-varying channel conditions and video flow characteristics. Quality of experience (QoE) in multimedia traffic has been the focus of extensive research in the recent years. It reflects user's satisfaction towards a particular service and provides valuable input to the service providers to determine the quality of...
Garbage collection (GC) and resource contention on I/O buses (channels) are among the critical bottlenecks in Solid State Disks (SSDs) that cannot be easily hidden. Most existing I/O scheduling algorithms in the host interface logic (HIL) of state-of-the-art SSDs are oblivious to such low-level performance bottlenecks in SSDs. As a result, SSDs may violate quality of service (QoS) requirements by...
Cloud computing is a computing style where resource providers can offer on-demand services in a transparent way and clients usually pay as they go. It introduces a new level of flexibility and scalability for IT users addressing challenges such as the rapid change in IT and the need to reduce cost and time of infrastructure management. However, to be able to offer QoS guarantees without limiting the...
Recent efforts towards mobile cloud propose to offload mobile applications to cloud servers for the improved performance and battery life of mobile devices. However, existing schemes completely ignore the costs of cloud resources by assuming that idle servers are always available for free of charge. These unrealistic assumptions make each server run only a small load to achieve the guaranteed high...
One of the major challenges of Cognitive Radio (CRNs) is the spectrum handoff issue. Spectrum handoff happens when a Primary Users (PUs) appears in a spectrum band that is occupied by a Secondary User (SU). In such a case, SU should empty this spectrum band and perform a handoff procedure and search for an available free one. This process will be continued until the SU completes its data transmission...
For content delivery in P2P video streaming systems there are two main approaches: push-based and pull-based. In pull-based P2P video streaming, neighbor peers request missed chunks of video from each other, but sometimes peers can't receive this chunks because of the exit or delay of the corresponding neighbor. Although previous works such as forward error correction (FEC) and automatic repeat request...
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