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HPC systems have shifted to burst buffer storage and high radix interconnect topologies in order to meet the challenges of large-scale, data-intensive scientific computing. Both of these technologies have been studied in detail independently, but the interaction between them is not well understood. I/O traffic and communication traffic from concurrently scheduled applications may interfere with each...
Several models can be used to determine the attenuation incurred by sound waves as they travel under water. A trade-off between accuracy and complexity is observed in this respect: the most accurate results are typically yielded by some form of numerical solution to the sound propagation equations, but at the price of high complexity; conversely, simple link budget equations are typically valid only...
Due to the large number of wireless cells that are required for accurately evaluating inter-site interference in cellular networks, computational resources often pose a considerable limitation. In this paper, a novel method for modeling interference at the edges of the region of interest (ROI) of the cellular topology is proposed. While it shares conceptual ground with previous wrap-around techniques,...
In this paper, a model for the static channel assignment in multi-radio multi-channel wireless mesh networks is proposed. We describe an interference model in wireless communication environment. The degree of detail in the model determines the accuracy of channel assignment. In many wireless mesh networks studies, the simplistic protocol interference model is adopted, but the model is usually not...
A critical issue in wireless sensor networks isrepresented by the limited availability of energy withinsensor nodes. An effective approach for energy conservationis scheduling sleep intervals for extraneous nodes, while theremaining nodes stay active to provide continuous service.Most previous solutions assumed a perfect radio conditionwith a static, circular coverage. However, in real situations,radio...
This paper supposes a new graph model for wireless Mesh Networks (WMN) with MIMO channels. The model is based on the anttena model and single channel mesh, place edges into different channel plane avoiding interference. The active edge group algorithm select the most active edges without interference, then perform high throughput. The coding scheme in the hexagonal graph keeps the symmetry, and can...
Reasonable and effective communication simulation model is an important basic constitutes of joint operations simulation. The communication delay computation of the communication model is the prerequisite of high-level operational simulation. Combing with the high-level, complex communication network types and structure characteristics of joint operations simulation system, the paper put forward the...
Interference has a significant impact on the network communications; hence efforts have been made to reduce it. Although interference has an unambiguous definition, researchers have different opinions about the interference model. There are mainly two kinds of models. One is based on the number of nodes, and the other is based on the signal strength. However, as discussed in this paper, the former...
This paper reports on our experience in using OMNeT++ to develop a network simulator focused on railway environments. Common design problems are analyzed, making emphasis on radio communication models. Scalability issues are raised when modeling the large topologies that are associated with railway communications. Our conclusions point out that model reusability must be reinforced and that a component-based...
Much of the focus in dynamic spectrum access has been on detection of primary users prior to channel occupation by secondary users as well as expediently vacating channels in the event that primary users reappear. These efforts are necessary, though reactionary in nature. We propose that, in addition to these efforts, the topology of the secondary network be optimized in order to proactively minimize...
There is wide consensus that properly taking into account wireless interference is necessary to design high performance link scheduling algorithms for multi-hop networks. However, most approaches in the literature use simplified models, which significantly abstract from the physical behavior of wireless links. Indeed, the main problem in representing the wireless propagation conditions with a proper...
Building on the extensive research in Virtual Reality (VR), we are proposing a new dynamic prototype for modelling and simulating carbon emissions in a virtual village called VIRVIL. VIRVIL is a simulated settlement for the assessment of the impact of low and zero carbon technologies and measures in the built environment. The prototype will focus on the impact on the community as a whole, as well...
Coding advantage refers to the potential for network coding to improve end-to-end throughput or reduce routing cost. How large can the coding advantage be? We investigate this fundamental question in the classic undirected network model. So far, all known networks where such potential exists are based on a special class of topologies known as combinatorial networks. We try to prove a rather small...
Advances in micromachining technology can facilitate the integration of SAW (Surface Acoustic Wave) devices and CMOS circuitry on IC scale substrate for Monolithic fabrication. The optimal design and performance of these filters can be reached by using new Smart materials. The key component in the structure of the SAW device is the piezoelectric materials used which depends mainly on some important...
Several policies have recently been proposed for attaining the maximum throughput region, or a guaranteed fraction thereof, through dynamic link scheduling. Among these policies, the ones that attain the maximum throughput region require a computation time which is linear in the network size, and the ones that require constant or logarithmic computation time attain only certain fractions of the maximum...
In this paper, we propose an adaptive pacing scheme at the link layer for IEEE 802.11 based multihop wireless networks. Our objective is to improve the performance of higher layer protocols without any modifications to them. Our adaptive pacing scheme estimates the four-hop transmission delay in the network path without incurring any additional overheads, and accordingly paces the packets to reduce...
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