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The ExaNeSt project started on December 2015 and is funded by EU H2020 research framework (call H2020-FETHPC-2014, n. 671553) to study the adoption of low-cost, Linux-based power-efficient 64-bit ARM processors clusters for Exascale-class systems. The ExaNeSt consortium pools partners with industrial and academic research expertise in storage, interconnects and applications that share a vision of...
A two-stage low-noise amplifier (LNA), designed using GlobalFoundries' 130 nm SiGe BiCMOS process technology for 56–64 GHz applications is presented in this paper. The LNA consists of two cascode stages, with inductive degeneration using short stub transmission lines with a quarter wavelength. The input matching and output matching adopt T-section matching to ensure optimal noise and input matching,...
With the increasing complexity of networks, Software Defined Networks (SDNs) have been developed to help administrators configure and operate network services with controllers such as Beacon, OpenDaylight and Floodlight. These controllers provide a suitable platform for high bandwidth applications. In this paper, several SDN controllers are evaluated using different network topologies. Some controllers...
In this paper, we propose an OpenFlow-assisted framework for P2P (peer-to-peer) live streaming, which incorporates an OpenFlow-assisted architecture and an OpenFlow-assisted algorithm. The architecture combines the characteristics and advantages of both BitTorrent system and OpenFlow network. The algorithm can dynamically calculate the path and corresponding available bandwidth for each flow according...
Topology reconstruction enables optical data center networks (DCNs) to adapt to dynamic traffic patterns, but may interrupt ongoing data transmissions. We propose a cross-layer mechanism to deliver traffic over multiple optical paths and adjust their TCP congestion windows coordinately. The experimental results show that it can effectively reduce the impacts on flow transmission.
Overlay multicast is regarded as a promising way for distributing file or live stream during recent years. In this paper, we reinforce an optimal DAGs (directed acyclic graphs) construction algorithm by relaxing its partitioning and sorting conditions. We employ a realistic topology (CERNET2 backbone) to evaluate several typical types of optimal DAGs in terms of the underlay performance metrics. Simulation...
Data centers are core infrastructure of cloud computing. Network virtualization in these centers is a promising solution that enables coexistence of multiple virtual networks on a shared infrastructure. It offers flexible management, lower implementation cost, higher network scalability, increased resource utilization, and improved energy efficiency. In this paper, we consider switch-centric data...
This work is focused on the characterization of the traffic allocated in Elastic Optical backbone networks when different dynamic traffic profiles are generated. Extensive simulations are done to statistically model the real-time traffic carried by this kind of networks. Well known topologies such as NSFNet and US_Backbone are considered as well as different parameters applied to the traffic generation...
Coflow scheduling without prior knowledge has been proposed recently. However, the previous solution, Aalo, has two problems: it does not explicitly control the flow rate; it assumes the network is ideally non-blocking (with perfect traffic balancing and no oversubscription). In this paper, we show the performance loss caused by the above two problems. We propose EAalo to cope with the problems. It...
Enterprise Networking (EN) services are source of high revenues for carriers. However, the traditional way of providing and selling those to enterprise and business customers is ossified and unsatisfactory for users. High prices, static connections and slow time to provision, make enterprise users doubtful about whether guaranteed connectivity is worth the price and push them to look for alternative...
Multi-path allocation has been proposed as a simple way to achieve traffic protection in different networking domains. In this work dual-path allocation is proposed for Elastic Optical Networks (EON) assuming dynamic offered traffic, and its performance is quantified by simulation. Indeed, dual-path allocation is compared with partial dedicated path protection assuming different scenarios. In addition...
Emerging neural network accelerators are often implemented as many-core chips and rely on a network-on-chip to handle the huge amount of inter-neuron traffic. The wellknown mesh and tree are the most popular topologies in prior many-core neural network accelerator designs. However, these conventional topologies suffer from high diameter, low bisection bandwidth, and poor collective communication support...
The control packets in the Data Center Networks (DCNs) have to contest with the data packets although they are usually much shorter in size and much more important in network management. Moreover, the uneven distribution of the packets may create potential hotspots in the DCN which could degrade network performance drastically. To bridge these gaps, a few proposals have been put forward to construct...
Service chaining composed of several different virtual network functions (VNFs) constitutes a use case of Network Functions Virtualization (NFV). In a conventional method, the optimal allocation of VNFs and logical paths was resolved by using integer linear programming. However, because the approach did not consider that the required resources of each service differ, the residual resources of the...
Routing Algorithm is an important mechanism which decides data transferring path in a network. Several existed routing algorithms are derived from a fundamental of graph theory with shortest path approach. A lot of additional network metrics were applied to serve the best quality of service (QoS) to end devices. However, a selected path from the existed algorithms can suffer from additional end-to-end...
The development of optimal XY θz flexure mechanisms, which can deliver high precision motion about the z-axis, and along the x- and y-axes is highly desirable for a wide range of micro/nano-positioning tasks pertaining to biomedical research, microscopy technologies and various industrial applications. Although maximizing the stiffness ratios is a very critical design requirement, the achievable translational...
Sleep mechanism(SM) is often used to design green network, however, sleep mechanism must take data loss, network performance and other situations into consideration. Due to hierarchical and centralized control, SDN makes it simple to deploy new applications. SDN is becoming more and more popular in new network applications. In this paper, a new implementation of SM based on SDN is proposed, the SM...
Software-defined networking (SDN) has separated control and forwarding planes, which is a powerful approach to enable network virtualization by SDN hypervisors to share physical SDN networks among multiple virtual SDN in cloud data center. However, the centralized control and virtual network shared physical network are delicately weak and easy to failure if virtual topology embedding is not properly...
This work proposes the sub-module integration of flyback converters with an unique unfolding H-bridge inverter, for photovoltaic (PV) microinverter application. An dedicated control strategy is also proposed. This sub-module integration proposed to remove the existing junction box of the PV module and replace the three by-pass diodes with three individual DC-DC converters connected to a single-phase...
In modern data centers, many flow-based and task-based schemes have been proposed to speed up the data transmission in order to provide fast, reliable services for millions of users. However, existing flow-based schemes treat all flows in isolation, contributing less to or even hurting user experience due to the stalled flows. Other prevalent task-based approaches, such as centralized and decentralized...
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