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In recent studies, researchers have developed various computation offloading frameworks for bringing cloud services closer to the user via edge networks. Specifically, an edge device needs to offload computationally intensive tasks because of energy and processing constraints. These constraints present the challenge of identifying which edge nodes should receive tasks to reduce overall resource consumption...
New Long-Range radio technologies have recently emerged in the IoT landscape. These technologies work in the Sub-GHz bands, allowing low-power communications over long distances. They are typically based on star-topology networks, where nodes send the data directly to a base station connected to the Internet. One of such technologies is LoRa. Enabled LoRa-based multihop communications would open up...
Video streaming has become a main contributor in an ever increasing Internet traffic, and meets the users expectation is a challenging task for both the Network service Provider (NsP) and Content service Provider (CsP). In this context, a new metric called: Quality of Experience (QoE) is evolved to measure the user satisfaction using video service, and it becomes a key driver for achieving the business...
The emergence of high-speed wide bandgap (WBG) semiconductors, including Silicon Carbide (SiC) and Gallium Nitride (GaN) transistors has given rise to improvements in the fundamental design principles necessary to maximize systems based on these smaller, faster, higher power density WBG devices. As GaN based converters' in-circuit capability continues to advance, the topic of high performance measurement...
Fragmentation in Elastic Optical Networks is an issue caused by isolated, non-aligned, and non-contiguous frequency slots that can not be used to allocate new connection request to the network, due to the optical layer restrictions imposed to the Routing and Spectrum Assignment (RSA) algorithms. To deal with this issue, several studies about Spectrum Defragmentation have been presented. In this work,...
Mobile users in an urban environment access content on the internet from different locations. It is challenging for the current service providers to cope with the increasing content demand from a large number of collocated mobile users. In-network caching to offload content at nodes closer to users alleviate the issue, though efficient cache management is required to find out who should cache what,...
In this work, we seek to gain an understanding of the InfiniBand network processing limitations that might exist in gathering performance metric information from InfiniBand switches using our new LDMS ibfabric sampler. The limitations studied consist of delays in gathering InfiniBand metric information from a specific switch device due to the switch's processor response delays or RDMA contention for...
This paper presents a broad bandwidth (DC to ∼50MHz) current sensor. It is inserted in the current conducting path and it has a low insertion inductance of about 1 nH due to a coaxial housing. The measurement procedure is based on HOKA principle using TMR sensors for the low frequency capture and a Rogowski coil for the high frequency capture. The HOKA principle combines both by analog signal processing.
Wide Band Gap (WBG) transistors using materials such as Gallium Nitride (GaN) and Silicon Carbide (SiC) offer superior electrical and thermal properties, as well as fast switching capability. However, the high dv/dt and high di/dt may cause ringing with the parasitic inductances and capacitances in the switching loop, increasing overshoot voltages and reducing confidence in the design. Also, making...
This paper presents the details of a CUDA implementation of the Subgraph Isomorphism Graph Challenge, a new effort aimed at driving progress in the graph analytics field. challenge consists of two graph analytics: triangle counting and k-truss. We present our CUDA implementation of the graph triangle counting operation and of the k-truss subgraph decomposition. Both implementations share the same...
Wireless communication networks are very crucial for any operations of all sectors of modern society such as commercial mobile communication or military communication. High-altitude electromagnetic pulse (HEMP) leads severe threats to the survivability and robustness of communication network. Due to the high complexity and hard proven properties of large-scale networks, network-level HEMP effect evaluation...
Future space missions require reliable architectures with higher performance and lower power consumption. Exploring new architectures worthy of undergoing the expensive and time-consuming process of radiation hardening is critical for this endeavor. Two such architectures are the Texas Instruments KeyStone II octal-core processor and the ARM® Cortex®-A53 (ARMv8) quad-core CPU. DSPs have been proven...
When on-chip interconnection network scales to integrate more processing elements, the average end-to-end latency is highly increased due to long average hop distance. Though it has been discovered that, almost of the communication in large scale networks is between nodes in a short range, it revealed that the small portion of data delivery between distant nodes consumes or occupies most of the network...
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...
We apply the statistical network assessment process (SNAP) to estimate merit of flex- vs. fix-grid spectral-use with increasing-size traffic grooming (RG) of 20, 40 and 100 Gbps and progressive traffic requests on the residual C-band of the Italian network, partially loaded by legacy and defragmented traffic with a residual bandwidth percentage (RBP) of 25%, 50% and 75%. We show how the blocking probability...
Many online application services are now provided by cloud-deployed VM clusters. Although economical, VMs in the cloud are prone to interference due to contention for physical resources among colocated users. Worse, this interference is dynamic and unpredictable. Current provider-centric solutions are application-oblivious and are thus not always aware of the user's SLO requirements or application...
Software-Defined Networking (SDN) is an innovative approach to provisioning and delivering QoS (Quality of Service) services, yet it is still devoid of context-differentiating services. In this paper we propose a network application (Autonomic QoS Broker) and a controller module that implements the OpenVSwitch Database Management Protocol (OVSDB). These two components were implemented and validated...
The current design drivers for multi-cores, namely performance per watt, scalability and flexibility, make the Networks-on-Chip (NoCs) the de-facto on-chip interconnect. State of the art NoCs can exploit heterogeneous solutions and complex DVFS techniques to fulfill also the variability of the application requirements. Relevant showstoppers to the design of a truly flexible NoC fitting all the possible...
Efficient test and diagnosis methods are required to ensure high levels of dependability of the electronic systems deployed to the market. These methods involve a trade-off in terms of accessibility to test nodes, test stimuli complexity, area overhead, and data processing that, altogether determine the impact that the involved operations have in the final cost, performance, and reliability presented...
Machine-type communications (MTC), considered as one of potential technologies in 5G, has attracted more and more attention in recent years. Massive MTC connection density but with small data rate leads to preamble deficiency and network congestion in the network. In order to solve this problem, we jointly utilize the back off strategy and the hierarchical access control method. We formulate a Quality...
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