This letter studies a non-orthogonal multiple-access (NOMA)-based mobile edge computing (MEC) system. In order to enhance communication coverage and energy efficiency, intelligent reflecting surface (IRS) is proposed, which deployed assist computation offloading from end users an access point (AP) equipped with server. We aim minimize the sum consumption by jointly optimizing transmit powers, transmission time, partitions IRS phase shift. To address non-convex formulated problem, we first...

In recent years, the underwater wireless optical communication has been arising a great concern of academia because its high bandwidth, low time delay spread, stability, rate and so forth. this paper, distributed energy- efficient balanced routing algorithm (DEEB) for an sensor network is proposed. The DEEB applicable both static dynamic network. It reveals through simulation experiments that can significantly reduce consumption energy, balance energy load nodes to prolong work comparing...

The mobile edge learning (MEL) system is an emerging intelligent system, which can collect the data generated by Internet of things devices (IoTDs) and perform machine algorithms on computing platform. However, due to limited transmit power IoTDs severe propagation loss, maximizing F-measure in MEL systems a challenging task, meaningful performance metric algorithms. In order address dilemma, unmanned aerial vehicle (UAV)-enabled wireless powered proposed this paper. UAV provides energy for...

Abstract To avoid the problem of traditional methods consuming large computational resources to calculate kernel matrix and 2D discrete convolution, we present a novel approach for 3D gravity magnetic modelling. This method combines midpoint quadrature with fast Fourier transform (FFT) anomalies arbitrary density or susceptibility distribution. In this scheme, apply volume element integral. Then, convolution weight coefficient magnetization is efficiently computed via FFT. Finally, accuracy...

Abstract During the use, storage, or cleaning of polyetherimide (PEI) solutions, undesired white films often appear. In this study, equivalent experiments PEI solutions involving room temperature evaporation and solvent exchange with water are conducted to simulate their air exposure washing processes, respectively. Specifically, we focus on investigating phenomenon mechanism appearance in from a cellular‐like porous structure that exhibit finger‐like structure. Results obtained FE‐SEM,...

We propose a full-range displacement sensor system based on double fiber Bragg gratings (FBGs) with cantilever beam. This adopts magnetic scale as new transmission mechanism. By combining simple and low-cost beam structure makes the sensing probe very easy to realize. The optimal gap was explored through multiple sets of numerical simulations. experiment proved sine relationship between center wavelength shifts FBGs linear displacement, proving feasibility this method. Results indicate that...

We propose a full-range displacement sensor system based on double fiber Bragg gratings (FBGs) with cantilever beam. This adopts magnetic scale as new transmission mechanism. By combining simple and low-cost beam structure makes the sensing probe very easy to realize. The optimal gap was explored through multiple sets of numerical simulations. experiment proved sine relationship between center wavelength shifts FBGs linear displacement, proving feasibility this method. Results indicate that...

In order to meet the long-distance and high-reliable transmission needs of multi- channel data, a multi-channel data system based on PCIE-SRIO is designed. The Xilinx K7 series FPGA chip designed, internal integrated PCIe SRIO IP cores are used, then optical cable connected achieve long -range sending receiving. bus realize interconnection between CPU chip, actively initiates terminates DMA method high-speed interaction multiple channels chip. logic realizes interface HELLO packet format,...

The general extreme value distribution (GED) is applied to fitting wind speed data, and the failure problem of parameter estimation for GED put forward. In order resolve problem, probability plot correlation coefficient maximum likelihood are combined establish highly-efficient stable method GED. Comparison further made by effect Type I, II III Distribution. Results indicate that effective peak almost equivalent those Distribution, namely same with optimal among So has obvious advantage in data.

The small defects in overhead catenary system (OCS) can result long time delays, economic loss and even passenger injury. However, OCS images exhibit great variations with complex background oblique views which pose a challenge for detection high-speed rail system. In this paper, we propose the spatial-prior-guided attention object two main advantages: (1) spatial-prior is proposed to retain spatial information between electric components OCS. (2) Based on spatial-prior, model (SAM) designed...

Wind tunnel balances, as the most important equipment in wind force testing, are responsible for measurement of raw aerodynamic data experiments. A multi-channel acquisition system was designed to meet needs balance acquisition. This article gives hardware and software design system. The adopts modular design, with Zynq-7000 series SoC chip xc7z020 control core, LTC1053 composition instrument signal conditioning channel, combined / D conversion ADS8598S wireless network card RT3070L achieve...

In wireless network systems, time of arrival (TOA) scheme is always needed to implement the self-localization user manual. If multiple positions interest exist, Cramer-Rao lower bounds (CRLBs) TOA localization in these are determined by deployment base stations. The design station placement addressed this paper; and rather than exhaustive method (EXM) we propose optimize over a selection vector. Under certain condition, non-convex optimization problem can be relaxed into convex one;...

In recent years, the underwater wireless optical communication has been arising a great concern of academia because its high bandwidth, low time delay spread, stability, rate and so forth. this paper, distributed energy- efficient balanced routing algorithm (DEEB) for an sensor network is proposed. The DEEB applicable both static dynamic network. It reveals through simulation experiments that can significantly reduce consumption energy, balance energy load nodes to prolong work comparing...

Here, the authors propose a new over-the-horizon time-difference-of-arrival localisation model based on ground-wave and simultaneously put forward modified semi-definite programming algorithm, which is called Ground-wave (G-SDP). If both target base stations are surface of earth far away from each other, propagation path signal curve along instead straight line, thus making traditional positioning inefficient. To overcome problem, they develop novel explore priori information to achieve...