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The high densities of network nodes has made spatial reuse an essential characteristic of modern wireless networks. In this paper, we evaluate the maximum throughput of Carrier Sense Multiple Access (CSMA) for Vehicular Ad-hoc Networks (VANETs) when spatial reuse is taken into account. We begin our study by extending a simple stochastic model in order to fit a VANET pattern and to obtain the spatial...
The article deals with the computer-aided design of the route network based on packet models. This network designed for data transmission in distributed information management system, which operates in real time. The structure and function of the system node are presented. The models for the formation and transmission of data flows are considered.
Wireless Sensor Networks (WSNs) play as a key important role in Internet of things era, they provide a lot of utilized applications deployed in quite different environments. Beside its clear benefits, a WSN has to face with several challenges which come from a practical environments such as interference phenomenon, energy limitation, transmission constraints or mobility model. Especially, several...
Resource management approaches are necessary for managing the run-time dynamics originating from application dynamism, platform reliability degradation and changing operating conditions. Existing on-chip resource managers assume that resources are always available and are biased toward application requirements. This paper presents Agora, a distributed resource management framework based on market...
Recently, adoption of Flash based devices has become increasingly common in all forms of computing devices. Flash devices have started to become more economically viable for large storage installations like datacenters, where metrics like Total Cost of Ownership (TCO) are of paramount importance. Flash devices suffer from write amplification (WA), which, if unaccounted, can substantially increase...
This paper presents an LPV approach to dynamic modeling of a web-server hosted on a private cloud. The cloud hosting web-server is a variable capacity system with two control inputs, first is the number of virtual machines which is indicative of the capacity of the cloud and second is the admission control used for regulating the workload. As the workload and the hosting conditions change frequently,...
In this paper, we study the problem of exploiting parallelism in a hard real-time streaming application modeled as a Synchronous Data Flow (SDF) graph and scheduled on a cluster heterogeneous Multi-Processor System-on-Chip (MPSoC) platform such that energy consumption is minimized and a throughput requirement is satisfied. We propose a polynomial-time solution approach which: 1) determines a processor...
The prediction of cloud consumer resource needs is a vital step for several cloud deployment applications such as capacity planning, workload management, and dynamic allocation of cloud resources. In this paper, we develop a new prediction model for predicting cloud consumer resource needs. The new model uses a new hybrid prediction approach that combines the Multiple Support Vector Regression (MSVR)...
Internet of Things (IoTs) is gaining increasing significance due to real-time communication and decision making capabilities of sensors integrated into everyday objects. Predicting performance in IoTs is critical for detecting performance bottlenecks, designing optimal sleep/wake-up schedules and application-aware performance tuning. However, performance prediction becomes a significant challenge...
Application performance on these processor array platforms is highly sensitive to how functionality is physically placed on the device, as this choice crucially determines communication latencies and congestion patterns of the on-chip inter-core communication. The problem of identifying the best, or just a good enough, partitioning and placement does not, in general, admit to an analytic solution,...
Research on network slicing for multi-tenant heterogeneous cloud radio access networks (H-CRANs) is still in its infancy. In this paper, we redefine network slicing and propose a new network slicing framework for multi-tenant H-CRANs. In particular, the network slicing process is formulated as a weighted throughput maximization problem that involves sharing of computational resources, fronthaul capacity,...
Streaming applications usually run on heterogeneous multiprocessor platforms and are required to have a high throughput, which in turn may increase the energy consumption. A trade-off between these two criteria is important for a system. Synchronous data flow graphs (SDFGs) are widely used to model streaming applications. In this paper, we propose a paralleled Pareto optimal scheduling method (PPOS)...
Recent research has established that hardware overprovisioning can improve system power utilization as well as job throughput in power-constrained, high-performance computing environments significantly. These benefits, however, may be associated with an additional infrastructure cost, making hardware overprovisioned systems less viable economically. It is thus important to conduct a detailed cost-benefit...
In this paper, we consider joint power and time allocation for wireless powered communication networks (WPCNs). We propose a novel system model that allows users to first harvest energy from the power station (PS) in downlink, and then concurrently send data information to their access points (APs) in uplink. For fixed users' data demands, we provide an iterative algorithm to compute the transmit...
To address the mobile data growth challenges, mobile operators need to access more spectrum resources. LTE in unlicensed spectrum (LTE-U) has been proposed to extend the usual operation of LTE in licensed spectrum to cover also unlicensed spectrum, mainly at 5 GHz band due to its wide spectrum availability. However, this extension poses significant challenges especially regarding the coexistence between...
Computer performance is determined by the amount of useful work accomplished by system or network with the time and resources used. A general methodology is proposed to describe how service demands are calculated from different types of data using queuing network (QN) model using different configuration. A model is constructed to answer several scenarios, like the addition of multiple disks and multiple...
We propose and design a new Block I/O schedulingscheme called Bulk I/O Dispatch (BID) suited for disk intensiveMapReduce applications. Large data access by such applicationsresult in a large number of block I/O requests which have thepotential to be sequentialized. However, due to contention byother applications and the way current I/O schedulers operate, the opportunities of a large sequential I/Os...
The security of the data is an important issue on cloud environment as it is directly related to the users. Transmission of the data involves various risks and the proposed model will address the issues of the secure data transmission on cloud platforms. For secure data transmission over internet, a security layer has been implemented between the server end and the cloud user. A new scheme includes...
The Generalized Nets apparatus is applied here to describe the MiMa-algorithm for computing a conflict-free schedule for packet switch. In the paper we propose a family of patterns for nonuniform traffic simulation. The results for throughput on a switch node with MiMa-algorithm by computer simulations with these patterns are presented. The necessary computations have been executed on BG01-IPP grid-cluster...
We study the spectrum allocation problem in flexgrid optical networks under demand uncertainty. Using elastic spectrum allocation the slots assigned to a lightpath can be changed under different restrictions without service disruption. We study five different technologies to manage these changes. It is shown that the two least efficient models are less computational demanding than the other variants...
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