Liang Han

University of Science and Technology Beijing

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Yong Wang

Tianjin Medical University

Xiao Feng

Beijing Institute of Technology

Xilai Jia

University of Science and Technology Beijing

Fangming Xiang

National Energy Technology Laboratory

Ting Huang

Southwest Jiaotong University

Zuowan Zhou

Southwest Jiaotong University

Hongwei Bai

Affiliated Hospital of Nantong University

Yongming Liu

Cotton Research Institute

Fei Yang

University of Waikato

Xiaoxiao Sun

Anhui Normal University

Cooperative Institutions

Chinese Academy of Sciences

Tsinghua University

Research Institute of Petroleum Exploration and Development

Harbin Institute of Technology

PetroChina Southwest Oil and Gas Field Company (China)

Xidian University

Southwest Petroleum University

Fudan University

Southeast University

University of Chinese Academy of Sciences

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Heterogeneous Acceleration of Hybrid PSO-QN Algorithm for Neural Network Training

IEEE Access (2019)

Shun Yan Qiang Liu Jiajun Li Liang Han

Artificial neural network (ANN) has successfully provided solutions to many practical problems. One of the difficulties in training ANNs is finding the ideal solution to the network weights quickly. This paper designs an implementation of the hybrid particle swarm optimization (PSO) and quasi-Newton (QN) algorithm on CPU-GPU platform using OpenCL to accelerate ANN training. The PSO-QN implementation combines the strength of the PSO algorithm in global search and the advantage of the QN algorithm in fast convergence rate. A configurable parallel line search implementation and an efficient parallel reinitialization implementation are proposed to improve the performance and reduce data transmission. Experiments show the PSO-QN hybrid parallel implementation on CPU-GPU platform can achieve up to 362x and 8.9x acceleration compared with the C++ implementations of PSO and BFGS-QN on CPU, respectively. Compared with the PSO and BFGS-QN parallel implementations, the training loss of the PSO-QN hybrid implementation at given training time is reduced by 15.16% and 3.97%, and the testing error is reduced by 13.66% and 6.86%, respectively.

Broyden–Fletcher–Goldfarb–Shanno algorithm

Implementation

10.1109/access.2019.2951710

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Citations (9)

Using an Equivalence-Based Approach to Derive 2-D Spectrum of BiSAR Data and Implementation Into an RDA Processor

IEEE Transactions on Geoscience and Remote Sensing (2020)

Tao Xiong Yachao Li Qi Li Ke Wu Lili Zhang

An equivalent range equation with a monostatic equivalent component and a bistatic synthetic aperture radar (BiSAR) compensation component was proposed. There were five monostatic equivalent parameters (MEPs) in the both components. With the MEPs, a BiSAR range equation can be expressed in a form similar to the monostatic SAR (MoSAR) expression. Then, by using the range equation and the principle of stationary phase (POSP), we analytically derive the 2-D spectrum of a point target, and this 2-D spectrum is implemented into the range Doppler algorithm (RDA) that processes the translational invariant (TI) BiSAR data. In our RDA, spatially variant range cell migration (RCM) correction and azimuth compression (AC), both of which are related to the spatially variant MEPs, are required to focus all targets in the whole scene of different range cells. Simulations under a wide range of imaging parameters are conducted to assess the equivalent range equation and the 2-D spectrums. Satisfactory results are obtained. In addition, traditional methods for motion compensation can be directly applied to our equivalent range equation. Finally, the RDA is evaluated through the analysis of acquired raw BiSAR data. Well-focused images are obtained. Therefore, the proposed equivalent range equation, derived 2-D spectrum, and RDA have been validated for forming imagery using raw BiSAR data.

Point target

10.1109/tgrs.2020.3011420

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Citations (11)

High-Performance Lithium-Ion Capacitors Produced by Atom-Thick Carbon Cathode and Nitrogen-Doped Porous Carbon Anode

Energy & Fuels (2021)

Liang Han Shouguo Kang Xiao Zhu Jinlai Li Qi Wang

The all-carbon lithium-ion capacitor (LIC) has the advantage of fast ion and electron transmission and is the most promising electrochemical energy storage equipment. Here, we reported a high-performance hybrid all-carbon LIC using an atom-thick carbocoal-derived hierarchical porous carbon (CHPC) cathode and a nitrogen-doped porous carbon (NPC) anode. CHPC and NPC were readily prepared through in situ catalytic activation and pyrolysis of low-cost anthracite and asphalt powder, respectively. The CHPC endows a large BET specific surfaces area of 3160 m2 g–1, a continuous highly curved three-dimensional (3D) network of atomic thickness, and wide pores of 0.95–3.68 nm, which give the CHPC with excellent capacitive merits. Meanwhile, the NPC possesses lots of active adsorption sites and expanded interlamellar space for effective storage and migration of Li+, endowing the rapid kinetics. Hybrid LICs by coupling such CHPC cathode and pre-lithiation NPC anode yielded high gravimetric capacitance (139 mAh g–1cathode at 0.5 A g–1) and energy density (220 Wh kgtotal–1 at a specific power of 805 W kg–1) in organic electrolyte. Furthermore, the process of obtaining atom-thick-wall high-surface-area carbon at low cost is readily scalable.

Carbon fibers

10.1021/acs.energyfuels.1c02509

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Citations (7)

Dynamics Analysis of CBR Reducer with Tooth Modification

IOP Conference Series Materials Science and Engineering (2019)

Xiaoxiao Sun Liang Han

China Bearing Reducer (CBR) is a one stage new type cycloid drive reducer which has large transmission ratio, high payload, high torsional stiffness, high tilting stiffness, compact size. In this paper, the cycloid gear with tooth modification of CBR reducer was investigated to analyse the contact force and stress. Firstly, the mechanical design of CBR reducer was introduced. Then, the profile equation of cycloid gear was derived by inverted gear train method. And the modified profile equation was derived by adding a small increment into the profile equation. Secondly, the dynamic model was built by multi-dynamics theory. Thirdly, the number of simultaneous contact teeth, contact force, stress with respect to modification value were investigated by dynamics software. The results show that the larger is the clearance between the cycloid teeth and pin, the larger are the contact force and stress.

Cycloid gear

Payload (computing)

Contact Mechanics

10.1088/1757-899x/517/1/012007

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Citations (0)

A New Numerical Force Analysis Method of CBR Reducer with Tooth Modification

Journal of Physics Conference Series (2019)

Xiaoxiao Sun Liang Han

A new one stage cycloidal reducer called China Bearing Reducer (CBR) which has large transmission ratio, high payload, high torsional stiffness, high tilting stiffness and compact size is designed. In this paper, a new force analysis algorithm is proposed to compute contact force of each tooth with modification. The cycloid drive theory and structure of CBR reducer is introduced firstly. Then the steps of force analysis algorithm are described and a numerical example of CBR25 reducer is analysed based on the algorithm. This method of force computing is more accurate than conventional force computing and can help better designing of CBR reducer.

Payload (computing)

Cycloid gear

10.1088/1742-6596/1187/3/032053

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Citations (4)

Formation and evolution of the strike-slip faults in the central Sichuan Basin, SW China

Petroleum Exploration and Development (2023)

Bingshan Ma Liang Han Guanghui Wu Qingsong Tang Weizhen Tian

Based on 3D seismic and drilling data, the timing, evolution and genetic mechanism of deep strike-slip faults in the central Sichuan Basin are thoroughly examined by using the U-Pb dating of fault-filled carbonate cement and seismic-geological analysis. The strike-slip fault system was initially formed in the Late Sinian, basically finalized in the Early Cambrian with dextral transtensional structure, was overlaid with at least one stage of transpressional deformation before the Permian, then was reversed into a sinistral weak transtensional structure in the Late Permian. Only a few of these faults were selectively activated in the Indosinian and later periods. The strike-slip fault system was affected by the preexisting structures such as Nanhuanian rifting normal faults and NW-striking deep basement faults. It is an oblique accommodated intracratonic transfer fault system developed from the Late Sinian to Early Cambrian to adjust the uneven extension of the Anyue trough from north to south and matches the Anyue trough in evolution time and intensity. In the later stage, multiple inversion tectonics and selective activation occurred under different tectonic backgrounds.

Transtension

Trough (economics)

Echelon formation

10.1016/s1876-3804(23)60394-5

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Citations (18)

Enhancing capacitive storage of carbonaceous anode by surface doping and structural modulation for high-performance sodium-ion battery

Powder Technology (2021)

Liang Han Zhimin Li Fei Yang Zhihua Xiao Yintao Yu

Carbon fibers

Sodium-ion battery

10.1016/j.powtec.2021.01.020

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Citations (25)

A Study on the Inspection Technology of the Electrode Defects of Li-Ion Power Battery Based on HALCON

Applied Mechanics and Materials (2013)

Liang Han Yongming Liu Dan Ya He Xiao Feng

Li-ion battery becomes an important development direction because of energy shortage and environmental pollution. The electrode is the main part of Li-ion battery, which has the important influence to the performance, cycle life and the capacity of the battery. So, it is necessary that we should accurately detect the surface defects of the electrode. The paper provides a detection approach based on industrial camera and image processing software HALCON. The machine vision technology is used to detect defects of the electrode, and the high-performance software HALCON to process and analyze the acquired image. The combination of software and hardware can improve the efficiency of detection.

Economic shortage

Environmental Pollution

10.4028/www.scientific.net/amm.470.617

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Citations (0)

Effect of mechanical pre-conditioning on fracture resistance of polypropylene

Chinese Journal of Polymer Science (2011)

Liang Han Fangming Xiang Yanli Li Ting Huang Yong Wang

Polypropylene

Impact resistance

Impact energy

10.1007/s10118-011-1038-6