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A heterogeneous network (HetNet), which consists of macro cells and small cells, is an effective tool to improve the system spectral efficiency by exploiting the benefit of spatial reuse. However, the benefit of HetNet is limited by the asymmetry of transmit power between macro base stations (BSs) and pico BSs. Traditional solutions lead to a tradeoff between received signal strength (RSS) and load...
Fat-tree is a popular topology for data center networks (DCNs). Many recent papers propose new energy-efficient techniques that reduce the power consumption of fat-tree DCNs by dynamically powering off idle network switches and links. However, fat-tree DCNs adopting those techniques still consume a significant amount of energy even when lightly loaded. In this paper, we examine the approach of merging...
Fully Integrated Voltage Regulator (FIVR) has been introduced on Intel® Xeon® microprocessors which are switching power converters on die. The FIVR design includes air core inductor structures implemented on the package along with output capacitor, compensators, power transistors and control circuits implemented on-die. FIVR analysis has to comprehend and co-optimize both the package and the die....
Content Placement (CP) problem in Cloud based Content Delivery Networks (CCDNs) leverage resource elasticity to build cost effective CDNs that guarantee QoS. In this paper, we present our novel CP model, which optimally places content on surrogates in the cloud, to achieve (a) minimum cost of leasing storage and bandwidth resources for data coming into and going out of the cloud zones and regions,...
Network virtualization enables diversified network architectures to coexist in a substrate network. Content-centric network (CCN), as one of the major proposals for the future network, can be deployed in the virtualized environment. However, the recent work that has attempted in this direction has not addressed issues concerning the unique resource usage of CCN in resource allocations during the embedding...
In recent years, CAPTCHA has been used as a panacea against HTTP-based Distributed Denial of Service (DDoS) attacks. However, they also cause a lot of inconvenience to legitimate users. In this paper, we present a framework to exploit the synchronized behaviour of bots to exhaust web server resources. Clustering technique is used to form separate group of attackers and legitimate users. The clusters...
We consider the design of transmission policies for sensor nodes that rely entirely on harvesting energy from the environment. Nodes store the harvested energy in a storage element which has constraints on maximum discharge rate and charging efficiency. Non-zero circuit power is considered and limitations on channel bandwidth and processor clock-rate are incorporated. We assume an additive white Gaussian...
The worst-case network throughput is an important performance metric of interconnection networks and it is of particular concern to real-time systems. The existing model for throughput analysis assumes that the router nodes will not constrain the throughput, and hence the ideal throughput of the network is determined completely by congestion in the channels/links. In many recently proposed NoCs, however,...
For high-precision control of a two-inertia system, information of both the drive side and the load side is usually required for obtaining high control bandwidth. In order to reduce the implementation cost and space, a novel control method, which employs the load side information only, is proposed using a high-resolution encoder which is today widely used in various fields. Simulation and experimental...
We propose a new load-dependent reach maximization procedure in dispersion-uncompensated optical networks with coherent detection, and estimate the electro-optic regenerations savings with respect to the standard full-load reach approach.
Stand-alone micro-grids need a proper management of the active power exchange. This work is focused on the parallel operation of multiple grid-connected converters in an island-grid system. The proposed solution features a master inverter which emulates the grid and multiple grid-connected converters operating in parallel. The current sharing and overload protection is achieved by small frequency...
This paper addresses the problem of gradual migration from fixed grid to flex grid. We discuss how to perform spectrum assignment in a mixed fixed/flex network, and we propose and compare three upgrade strategies under two traffic models in four different scenarios.
Passive Optical Networks (PONs) are widely used for the Fiber-to-the-Home (FTTH) solutions. Next generation PONs provides the platform for better service delivery at the access network. Managing the PON's bandwidth is important to satisfy the users with different requirements and to ensure quality of service (QoS) while providing a well-managed network with minimum loss of bandwidth. It can be further...
In 6LoWPAN, all the nodes access the Internet through the gateways, which are on the border to legacy IP networks and handle ingress and egress data traffic. A gateway as the traffic center may easily become the congestion-concentrated point so that causes reliability problems and performance degradation. Gateway bottleneck is the dominant reason for network capacity and throughput constriction, since...
The network reconfiguration (NR) techniques are key strategies to reduce the energy consumption in cellular networks. In this paper we propose a mechanism to further increase the energy gains resulting of the application of these strategies. Our approach exploits the delay tolerance of the users to increase the periods when no reconfiguration is needed. We developed the analytical model of the mechanism...
Heterogeneous network deployment is one of the key issues of future Long Term Evolution Advanced systems. However, the coexistence of high power macro-cells and low power femto-cells leads to co-channel interference problems that must be suitably counteracted. Enhanced Inter-Cell Interference Coordination allows a joint management of the resources among the cells so as to reduce the interference....
It becomes a challenge to design an efficient load balancing method via live virtual machine (VM) migration without degrading application performance. Two major performance impacts on hosted applications that run on a VM are the system load balancing degree and the total time till a balanced state is reached. Existing load balancing methods usually ignore the VM migration time overhead. In contrast...
Contiguous collinear dipoles connected with non-Foster circuits (NFCs) was proposed for improving the bandwidth of arrays. Prior literature focused on use of ideal negative inductance and for broadside scan only. This paper presents results of a feasibility study to evaluate and characterize performance of dipole arrays loaded with non-Foster circuits in terms of VSWR, gain, bandwidth (L Ku band)...
In this paper, we investigate an approach to designing FSS-based absorbers with the objective of extending the bandwidth performance and absorption level. Numerical results are presented to illustrate the application of the procedure.
Probabilistic load flow is becoming a more useful and needed power system analysis technique with the increase of stochastic generation and demand. This paper improves the usefulness of probabilistic load flow by demonstrating an algorithm for modeling voltage regulators within the probabilistic load flow solution. Previously, the voltage regulators have been removed from the system before analysis...
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