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Software-Defined Networking (SDN) provides the potential for highly configurable, automated networks by separating the control and forwarding functions of network devices. While SDN appears to have many potential benefits for coalition tactical networking, including rapid reconfigurability and improved network situational awareness, there are significant obstacles to overcome. In particular, the low...
Service performance degradation and downtimes are a common on the Internet today. Many on-line services (e.g. Amazon.com, Spotify, and Netflix, etc.) report huge loss in revenue and traffic per episode. This is perhaps due to the correlation between performance and end-users's satisfaction.
This paper proposes a crowdsourcing system that can provide Internet streaming media companies with the ability to assess users' Quality of Experience (QoE) when they are watching the company's online video streaming at their residences. To validate the effectiveness of the system, a resident measuring device and crowdsourcing applications on users' end device are implemented with several scenario...
Intelligent partitioning models are commonly used for efficient parallelization of irregular applications on distributed systems. These models usually aim to minimize a single communication cost metric, which is either related to communication volume or message count. However, both volume- and message-related metrics should be taken into account during partitioning for a more efficient parallelization...
Today, communication systems face major shortages in availability of free spectrum. Cognitive radio has evolved as the most feasible technology which can empower us to effectively utilize the available spectrum. A vital component of a Cognitive Radio Network is spectrum sensing, i.e. its ability to detect the presence of a primary user. This paper employs an adaptive threshold detection algorithm...
HTTP Adaptive Streaming (HAS) is becoming the de-facto standard for video streaming services over the Internet. In HAS, each video is segmented and stored in different qualities. Rate adaptation heuristics, deployed at the client, allow the most appropriate quality level to be dynamically requested, based on the current network conditions. Current heuristics under-perform when sudden bandwidth drops...
This paper reports on a comprehensive, fully automated resource use monitoring package, TACC Stats, which enables both consultants, users and other stakeholders in an HPC system to systematically and actively identify jobs/applications that could benefit from expert support and to aid in the diagnosis of software and hardware issues. TACC Stats continuously collects and analyzes resource usage data...
We define the bandwidth requirements for OM4 performance within the wavelength window of 850 to 950nm. We have manufactured a MMF meeting these requirements while maintaining full compatibility with legacy OM4. This MMF enables 400Gbps using wavelength division multiplexing.
DVB-T2 TV is at the implementation stage in Ukraine. Country net includes transmitters in 166 cities. The role of a radiomonitoring service is to ensure efficient use of radio-frequency spectrum particularly by measurements of the emission parameters including occupied bandwidth. It is necessary to find the spectrum level of X dB, which is lower than the predetermined 0 dB reference level and corresponds...
In modern mobile communication systems like HSUPA higher data rates are achieved by multiplexing more code channels on the same bandwidth. For certain configurations however the adjacent channel leakage is increased, thus the standards require a power back-off for these cases. A reliable estimate for the power-back-off is the cubic metric. The large number of computations necessary for cubic metric...
The paper introduces a novel method for selecting optimal line lengths of multiple offset-short standards that are applied to broadband calibration of vector network analyzers (VNAs). The method is based on the design of experiments (DOE) approach and analysis of the determinant of the Fisher information matrix. To interpret results of the analysis, new terms, adopted from the filter theory, are suggested...
We address the problem of routing Label Switched Paths (LSPs) in multi-layer networks based on the Generalized MultiProtocol Label Switching (GMPLS) paradigm. In particular, we pursue strategies for choosing the appropriate layer to host a new LSP request, since choosing this policy has enormous impact on the eventual performance of the network. Therefore, we developed a mixed strategy, the Min-phys-hop...
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