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Molecular docking is an important method in computational drug discovery. In large-scale virtual screening, millions of small drug-like molecules (chemical compounds) are compared against a designated target protein (receptor). Depending on the utilized docking algorithm for screening, this can take several weeks on conventional HPC systems. However, for certain applications including large-scale...
We present a new parallel algorithm for solving triangular systems with multiple right hand sides (TRSM). TRSM is used extensively in numerical linear algebra computations, both to solve triangular linear systems of equations as well as to compute factorizations with triangular matrices, such as Cholesky, LU, and QR. Our algorithm achieves better theoretical scalability than known alternatives, while...
Ordering vertices of a graph is key to minimize fill-in and data structure size in sparse direct solvers, maximize locality in iterative solvers, and improve performance in graph algorithms. Except for naturally parallelizable ordering methods such as nested dissection, many important ordering methods have not been efficiently mapped to distributed-memory architectures. In this paper, we present the...
The centralized control in Software Defined Networks paves the way for new services like Bandwidth Calendaring (BWC), where the possibility to shift temporally future bandwidth requests allows to efficiently use network resources. Assuming perfect knowledge of the calendar for all future bandwidth reservations is unrealistic. In this paper, we study the online version of the BWC problem presented...
In this paper, we study a spectrum allocation mechanism of Cognitive Radio Networks based on multi-backpack problem, and then propose a discrete hybrid leapfrog algorithm and a spectrum allocation method based on this algorithm. This algorithm uses the integer coding method and designs the corresponding algorithm search strategy, using the crossover and mutation operator to improve the algorithm performance...
Multipath TCP(MPTCP) is an experimental protocol under standardization in the IETF. It enables hosts to send data over several interfaces or paths and has use cases on smartphones, datacenters or dual-stack hosts. It has proven to increase bandwidth in these cases while remaining compatible with the existing network infrastructure and applications. However, with the popularity of Online Data-Intensive...
Cloud radio access network (C-RAN) is introduced as a promising network architecture to meet the ever-increasing mobile data traffic. Baseband processing is decoupled from the remote radio head (RRH) and centralized in a common resource pool in C-RAN architecture, which enables efficient resource allocation. In this paper, we study the user association problem in order to better utilize wireless resources...
The network selection problem in a heterogeneous network environment is studied in the paper. A 3-Param network selection algorithm for CR terminals is proposed. Both the factors that are sensed by the CR terminals and the factors that cannot be gained beforehand are taken into account in the algorithm. Through the evaluation of the primary networks integrating these factors, the algorithm will make...
Microstrip patch antennas are indispensable in the areas of mobile communication, medicine and RFID, largely due to low costs of fabrication. In this paper, we aim to increase the bandwidth of a patch antenna, operating in the X band region of frequency. For the said purpose, we initially synthesize a co-ax fed patch antenna for a solution frequency of 9 GHz. By the variation of three distinct parameters,...
Small satellites (Small Sats) (i.e., satellites weighing less than 100 kg) are attracting interest in the Department of Defense (DoD), Intelligence Community (IC) and commercial market for space-based data collection (e.g., imaging) and communication (e.g., links or relays). In fact, many emerging missions use constellations of many (e.g., greater 100) Small Sats for these purposes. Small Sats can...
Network Function Virtualization (NFV) and Software-Defined Networking (SDN) technologies enable a fast way of deploying network services by instant initialization of virtual network functions on standardized commodity hardware, and a flexible network control and management via dynamic reconfigurations over open protocols. In particular, virtual networks from distinct tenants can be provisioned on...
Compared with hardware receiver, the GPS software receiver has higher design flexibility, small size and low price, so it has a wide range of research prospects. In this paper, the GPS signal acquisition and tracking algorithm is studied. We use the collection and playback equipment to emulate the GPS signal and validate the acquisition and tracking algorithms. In the acquisition phase, the performance...
Energy efficient router is one of the most important and promising devices in the roadmap towards green communication and networking. In recent years, automatical power scaling adapting with real-time network traffic in a router has been proved to be practical on real hardware, which is an implementation under the traffic aware philosophy. In this paper, we further explore this direction, and present...
With the world drifting more and more towards the social network, the size and amount of data shared over the internet is increasing day by day. Since the network bandwidth is always limited, we require efficient compression algorithms to facilitate fast and efficient sharing of data over the network. In this paper, we discuss algorithms of widely used traditional and modern compression techniques...
This paper proposes a signal reforming algorithm based three-phase phase-locked loop (PLL) to estimate the phase angles of an unbalanced and harmonics affected three-phase voltage system. This technique transforms the unbalanced waveforms into a balanced one by first attenuating the harmonic components and then balancing the voltage waveforms so that any conventional synchronous reference frame (SRF)...
Convolutional neural network (CNN) finds applications in a variety of computer vision applications ranging from object recognition and detection to scene understanding owing to its exceptional accuracy. There exist different algorithms for CNNs computation. In this paper, we explore conventional convolution algorithm with a faster algorithm using Winograd's minimal filtering theory for efficient FPGA...
Transmission Control Protocol (TCP), a reliable stream delivery transport protocol performs well in wired network compared to the multi-hop wireless network. The multi-hop wireless networks have several distinct features like dynamic self-configuration and self-healing ability remains integrated with wireless internet that enhances its capability. The TCP implementation in multi-hop wireless network...
Due to dynamic wireless network conditions and heterogeneous mobile web content complexities, web-based content services in mobile network environments always suffer from long loading time. The new HTTP/2.0 protocol only adopts one single TCP connection, but recent research reveals that in real mobile environments, web downloading using single connection will experience long idle time and low bandwidth...
Signal Processing applications with an end to end analog interface are primitively implemented by using a hardcoded DSP or MCU unit to execute predefined algorithms. However, when a need to reconfigure the existent system arises, it involves reprogramming the whole system once again. Also in the case of an iterative process, while fine tuning the system, such an approach is tedious in nature. Hardware...
Multipath transport can simultaneously utilize many interfaces of a terminal to maximize the transfer throughput. However, when sharing the same bottleneck link with single-path flows, the multipath flows will occupy more network bandwidth and it will lead to the unfairness of resource allocation. In this paper, we propose a Congestion Control method with Fairness (CCMF) for multipath transport. CCMF...
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