نتایج جستجو برای: تبدیل vmd

تعداد نتایج: 35902  

Journal: :Energies 2023

This study proposes an effective wind speed forecasting model combining a data processing strategy, neural network predictor, and parameter optimization method. (a) Variational mode decomposition (VMD) is adopted to decompose the into multiple subseries where each contains unique local characteristics, all are converted two-dimensional samples. (b) A gated recurrent unit (GRU) sequentially mode...

Journal: :Computer systems science and engineering 2022

Improving short-term wind speed prediction accuracy and stability remains a challenge for forecasting researchers. This paper proposes new variational mode decomposition (VMD)-attention-based spatio-temporal network (VASTN) method that takes advantage of both temporal spatial correlations speed. First, VASTN is hybrid model combines VMD, squeeze-and-excitation (SENet), attention mechanism (AM)-...

Journal: :Desalination 2021

Desalination is still a rather energy intensive process, and also associated with the discharge of highly saline chemically contaminated brine; both these factors detract from sustainability desalination process. Fortunately, issues can be addressed by developing zero-liquid (ZLD) processes that powered low-grade (LG) heat sources. The objective current work to improve upon world's first commer...

Journal: :Accident; analysis and prevention 2003
Young-Jun Kweon Kara M Kockelman

Traffic crash risk assessments should incorporate appropriate exposure data. However, existing US nationwide crash data sets, the NASS General Estimates System (GES) and the Fatality Analysis Reporting System (FARS), do not contain information on driver or vehicle exposure. In order to obtain appropriate exposure data, this work estimates vehicle miles driven (VMD) by different drivers using th...

2016
Jiaming Yan Hong Hong Heng Zhao Yusheng Li Chen Gu Xiaohua Zhu

Targets located at the same distance are easily neglected in most through-wall multiple targets detecting applications which use the single-input single-output (SISO) ultra-wideband (UWB) radar system. In this paper, a novel multiple targets vital signs tracking algorithm for through-wall detection using SISO UWB radar has been proposed. Taking advantage of the high-resolution decomposition of ...

Journal: :Water research 2010
E Garcia-Castello A Cassano A Criscuoli C Conidi E Drioli

The purpose of this work was to analyse the potentialities of an integrated membrane system for the recovery, purification and concentration of polyphenols from olive mill wastewater (OMW). The proposed system included some well-known membrane operations such as microfiltration (MF) and nanofiltration (NF), as well as others not yet investigated for this specific application, such as osmotic di...

2017
Hui Chen Dan Xu Xinyue Zhou Ying Hu Ke Guo

Seismic time-frequency analysis methods can be used for hydrocarbon detection because of the phenomena of energy and abnormal attenuation of frequency when the seismic waves travel across reservoirs. A high-resolution method based on variational mode decomposition (VMD), continuous-wavelet transform (CWT) and frequency-weighted energy operator (FWEO) is proposed for hydrocarbon detection in tig...

Journal: :CoRR 2018
Subhankar Chattoraj Karan Vishwakarma

. In this paper we present a novel method for an automated diagnosis of breast carcinoma through multilevel iterative variational mode decomposition (VMD) and textural features encompassing Zernaike moments, fractal dimension and entropy features namely, Kapoor entropy, Renyi entropy, Yager entropy features are extracted from VMD components. The proposed method considers the histopathological i...

Journal: :Algorithms 2017
Deyun Wang Chenqiang Yue Shuai Wei Jun Lv

Agricultural commodity futures prices play a significant role in the change tendency of these spot prices and the supply–demand relationship of global agricultural product markets. Due to the nonlinear and nonstationary nature of this kind of time series data, it is inevitable for price forecasting research to take this nature into consideration. Therefore, we aim to enrich the existing researc...

Journal: :Aerosol science and technology : the journal of the American Association for Aerosol Research 2013
William G Lindsley Jeffrey S Reynolds Jonathan V Szalajda John D Noti Donald H Beezhold

Aerosol particles expelled during human coughs are a potential pathway for infectious disease transmission. However, the importance of airborne transmission is unclear for many diseases. To better understand the role of cough aerosol particles in the spread of disease and the efficacy of different types of protective measures, we constructed a cough aerosol simulator that produces a humanlike c...

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