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Virtualization of computing and communication infrastructureswere disseminated as possible solutions for networksevolution and deployment of new services on clouddata centers. Although promising, their effective applicationfaces obstacles, mainly caused by rigidity on the managementof communication resources. Currently, the Software-DefinedNetworks (SDN) paradigm has been popularizing customizationand...
In this paper, we present an architecture and implementation for self-managing cloud application using overlay networks and software defined networking (SDN). Through real world experiments on Amazon EC2 and Smart Applications on Virtual Infrastructure (SAVI) cloud, we demonstrate how our management mechanism autonomously maintains SLAs of application scenarios without provisioning extra resources.
High-performance CMOS current mirrors are used in a large variety of circuit as fundamental elements of analog design. As a consequence, several topologies have been proposed over the years to improve their performances. Among these solutions, the active input is mainly used to improve the speed of high-performance current mirrors. In this paper, we develop a complete formalism to evaluate the potential...
This work presents the study of a 5 GHz synthesized Chebyshev combline filter and its potential use in a self-structuring filter prototype. The self-structuring filter prototype will be a system where the center frequency and bandwidth can be controlled by an algorithm to produce the desired bandpass filter response. The impact of tuning capacitances on the insertion loss, 3 dB bandwidth and percent...
An ultra-wideband linear polarization converting metasurface is presented. The polarizer is based on a periodic arrangement of metallic elements printed on a grounded dielectric substrate. The element geometry of the metasurface is optimized with a genetic algorithm by discretizing the unit cell in a 16×16 pixel matrix. This polarization converter is able to work from 7.03 GHz to 29.01 GHz (121% of...
Geant, the pan-European Research and Education Network (REN) is working on a Software-Defined Networking (SDN) solution to improve the provisioning of the Bandwidth on Demand (BoD) service. The SDN-based solution will integrate with the current provisioning tool, AutoBAHN, to add support for OpenFlow domains. One of the main benefits of this approach is that the solution will still be compliant with...
One of the prevalent methods to achieve clock synchronization in star topology based wireless network, is by periodic transmission of a "Beacon" message from the controller. Using this message other nodes locate the start of the time frame established by the controller. This technique has not been energy efficient in case of low duty cycle applications, where the nodes have to receive the...
Virtualization technology can readily change the placement of an execution environment, such as a virtual machine (VM), in accordance with the current statuses. To effectively manage system resources in the virtualized infrastructure, the elasticity of a virtualized infrastructure has attracted significant attention for determining on which server VM should be deployed. However, there has been little...
Designing a cost-effective network topology for data centers that can deliver sufficient bandwidth and consistent latency performance to a large number of servers has been an important and challenging problem. Many server-centric data center network topologies have been proposed recently due to their significant advantage in cost-efficiency and data center agility, such as BCube, FiConn and BCN. However,...
Conventional datacenters, based on wired networks, entail high wiring costs, suffer from performance bottlenecks, and have low resilience to network failures. In this paper, we investigate a radically new methodology for building wire-free datacenters based on emerging 60GHz RF technology. We propose a novel rack design and a resulting network topology inspired by Cayley graphs that provide a dense...
High performance embedded applications are developed using system-on-chips (SoCs) which in turn include silicon intensive, integrated application processors. These SoCs integrate multi-core processor (i.e., ARM Cortex9 or A15) with variety of memory interface controllers, communication interface controllers and special purpose accelerators. Traditionally bus matrix is used for integrating these intellectual...
This paper presents a 300 MHz to 3 GHz Low-Noise Amplifier (LNA) with high HP3 and one of the smallest silicon area we could find. It is based on a single amplifier, where it is systematically optimized to achieve better results than more complex noise canceling topologies, thus, saving area and power consumption. A CMOS inverter with resistive feedback where transistors are self-biased in strong...
Conventional Active-RC filters require large GB/ωο ratio to operate properly. This means a lot of power and band-width are wasted. We explore two alternative implementation types which are more GB/ωο efficient. Thus, a comparison between Active-R and Gm-C low pass filters is presented. For this purpose, a first order and a biquad low pass structure was implemented using both techniques; analysis an...
Software Defined Networking (SDN) has emerged to be an ultimate solution for the management of data centers. The separation of control plane from the data plane has made it possible to manage physical and virtual networks through the SDN controller. This paper presents a novel Dynamic Multipath Scheduling Protocol (DMSP) for effective scheduling of packets on SDN virtual links, thus achieving full...
As the portable device market tries to enhance user experience, high-power audio systems with boosted supply voltage have been the main design focus recently. Several past works have addressed issues related to boosted supply voltages [1,2]. Nevertheless, the power stage retained the classical H-bridge structure in the previous works, which resulted in aggravated electromagnetic interference (EMI)...
Long-term-evolution (LTE) communication enables high data-rates but degrades the efficiency of the power amplifiers (PAs) due to high peak-to-average power ratios of transmitted signals. Envelope tracking (ET) and envelope-elimination-and-restoration (EER) techniques have been proposed to improve the PA efficiency by adapting the PA supply voltage to the envelope. Linear PAs in ET systems are mostly...
In future performance improvement of the basic building block of supercomputers has to come through increased integration enabled by 3D (vertical) and 2.5D (horizontal) die-stacking. But to take advantage of this integration we need an interconnection network between the memory and compute die that not only can provide an order of magnitude higher bandwidth but also consume an order of magnitude less...
As the amount of digital data the world generates explodes, data centers and HPC systems that process this big data will require high bandwidth and high capacity main memory. Unfortunately, conventional memory technologies either provide high memory capacity (e.g., DDRx memory) or high bandwidth (GDDRx memory), but not both. Memory networks, which provide both high bandwidth and high capacity memory...
In datacenter networks, big scale, high performance and fault-tolerance, low-cost, and graceful expandability are pursued features. Recently, random regular networks, as the Jellyfish, have been proposed for satisfying these stringent requirements. However, their completely unstructured design entails several drawbacks. As a related alternative, in this paper we propose Random Folded Clos (RFC) networks...
This paper proposes a new congestion control method based on a hop-by-hop rate control in named data networking (NDN). The proposed method suppresses the excessive reduction of Interest sending rate due to continuous negative acknowledgement (NACK) packets caused by the propagation delay. The proposed method limits the rate reduction to once per congestion. The point of our method is not to change...
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