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Big Data analytics and new problems in social networks, computational biology, and web connectivity led to a renewed research interest in graph processing. Due to "irregularity" of graph computations, efficient parallel graph processing faces a set of software and hardware challenges debated in literature. In this paper, by utilizing hardware performance counters, we characterize system...
WSNs with randomly deployed nodes, to reduce energy consumption while ensuring the connectivity and power of entire network is an important issue of research. A mobility and energy-aware cross-layer searching routing algorithm works in stationary and mobile scenario with the satisfactory performance in addition to mobility handling, provides route to nodes which forward data between each other directly...
This paper proposes and evaluates a performance efficient application mapping algorithm for mesh-based NoCs. The proposed algorithm first prioritizes tasks of the given application graph based on their total in/out communication traffic. Then a task with the most communication traffic is selected and mapped onto the center part of the mesh topology i.e., a core with the most available communication...
In this paper, we investigate an energy efficient transmission scheme for video streaming in buffer-aided relay networks. In order to minimize the average energy consumption, we propose an energy-efficient transmission algorithm (EETA), which selects either the source relay (S — R) or the relay user (R — U) link for transmission depending on the instantaneous channel state information as well as the...
In this paper, we propose an efficient motion estimation hardware architecture for High Efficiency Video Coding (HEVC) using a Modified Reference Data Access Skip (MRDAS) for reducing the minimum memory bandwidth. The memory bandwidth is responsible for the throughput limitations in motion estimation, especially when dealing with high quality video of a large frame size and search range. This architecture...
This work investigates the immediate reservation (IR), advance reservation (AR), malleable reservation (MR) service provisioning in elastic optical networks (EONs).We design request scheduling and/or routing and spectrum allocation (RSA) algorithms for the IR/AR/MR request, respectively. Simulation results show that the proposed IR/AR/MR service provisioning package can reduce request blocking probability...
To realize high-speed big data transmission, we combine the advantages of Nyquist Super-channel and Software Defined Optical Networks (SDON), thus establishing the SDNyquist platform that dynamically manages the whole optical network. This platform has the features of flexible resource allocation, high spectrum efficiency and global network optimization with the help of Routing, Modulation Level and...
Passive optical network (PON) has become the vital technology for the next generation access networks. The advancement of optical technology extends the span of the PON from 20 to 100 km. Such an extended PON is known as Long-Reach PON (LR-PON). But the data transmission in the existing LR-PONs suffer from longer propagation delays between the optical line terminal (OLT) and optical network units...
This paper shows the usefulness of soft computing techniques in antenna parameters calculation, design and optimization. Since long time, different soft computing techniques have been drawn attention of researchers, such as Artificial neural network (ANNs), Fuzzy Logic, Radial basis function neural network (RBFNNs) and evolutionary algorithms (EAs). Some popular EAs are Genetic algorithm and its variants,...
Network virtualization (NV) is an indispensable approach to handle the ossification of current Internet. Previous research has been conducted concerning the implementation issues like heuristic-based mapping algorithms, yet little has focused on quality of service (QoS) for end users who launch virtual network (VN) requests, and revenue both service providers and infrastructure providers can obtain...
Combining the needs of distribution business with the performance of special wireless networks, we propose a load balancing algorithm in heterogeneous wireless networks oriented to smart distribution grid for heterogeneous multi-networks coexistence including LTE special networks, WiMax special networks and the special wireless networks at 230M frequency. Firstly the number of business that current...
As virtualization is becoming a promising way to support various emerging application, efficient virtual network embedding (VNE) algorithm is becoming more and more important. In this paper, we investigate the VNE problem from a new perspective. We propose two concepts of strongly connected graph and weakly connected graph in undirected graph witch are similar to the concepts in directed graph. With...
The Terrain Observation by Progressive Scans (TOPS) mode solves the problems existing in the conventional ScanSAR mode by steering the antenna along the azimuth direction. However, the antenna steering introduces a serious azimuth signal aliasing both in time-domain and frequency-domain, thus traditional imaging algorithms are not available for the TOPS mode. In order to solve the azimuth signal aliasing,...
Network virtualization has been proposed to be a promising way to solve the Internet ossification problem. One of the main challenges for network virtualization is the virtual network embedding (VNE) problem, which focuses on the efficiency of the substrate resources allocation and involves the virtual node and link mapping problems. Node mapping process has serious influence on the whole mapping...
The interactions between Active Queue Management (AQM) algorithms and TCP have been extensively investigated in the last few years. However, majority of the studies are conducted without considering the consequences of different attacks on TCP flows. This research work aims to investigate the performance of TCP flows under Low-Rate Denial-of-Service (LDoS) attacks. In particular, we have performed...
The term Big Data, refers to sizably voluminous data whose volume, variability, and velocity make it very arduous to manage, process or analyzed. To analyze this sizably voluminous kind of data Hadoop will be utilized. However, Processing is very time-consuming. To resolve this quandary & to decrement replication time one solution is to executing the job partially, where an approximate, early...
Most research works related to dynamic wavelength bandwidth allocation in a time- and wavelength-division-multiplexed passive optical network are based on bin packing algorithm and present many advantages in terms of bandwidth utilization and energy efficiency. However, delay performance can be significantly degraded by frequent wavelength changes. In this paper, we propose a delay-aware dynamic wavelength...
Wireless sensor network (WSN) consists of sensor nodes to sense environmental or physical data and that will be communicated to sink through one hop or multi hop communication. These sensors are small, with limited processing and computing resources. These sensors can sense, measure, and gather information from the environment and transmit that data to the sink. All nodes in network are trying to...
This paper proposes a new control algorithm for optimally reshaping distributed generation (DG) output impedance so that the system damping and bandwidth are maximized. Such impedance reshaping is essential for managing variations in grid impedance and changes in DG operating conditions. The proposed control algorithm involves two design stages. First, the multivariable DG output impedance is derived...
It is known to all that time-domain back projection (BP) algorithm has several advantages for synthetic aperture radar (SAR) imaging[1], such as easily motion compensation for any flight track, unlimited size of the observe scene, arbitrary wide bandwidth and large integration angle. Because of the heavy computational burden of BP algorithm, many fast back projection (FBP) algorithms have proposed...
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