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A novel approach for feature extraction from a gamma‑ray energy spectrum based on image descriptor transferring for radionuclide identification

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Nuclear Science and Techniques 2022年第12期33卷 88-104页

作者： Hao‑Lin liu hai‑Bo ji jiang‑Mei Zhang Cao‑Lin Zhang jing Lu Xing‑Hua Feng Department of Automation University of Science and Technology of ChinaHefei 230026China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010China Fundamental Science on Nuclear Wastes and Environment Safety Laboratory Southwest University of Science and TechnologyMianyang 621010China

This study proposes a novel feature extraction approach for radionuclide identification to increase the precision of identification of the gamma-ray energy spectrum *** easier utilization of the information contained in the spectra,the vectors of the gamma-ray energy spectra from Euclidean space,which are fingerprints of the different types of radionuclides,were mapped to matrices in the Banach ***,to make the spectra in matrix form easier to apply to image-based deep learning frameworks,the matrices of the gamma-ray energy spectra were mapped to images in the RGB color space.A deep convolutional neural network(DCNN)model was constructed and trained on the ImageNet *** mapped gamma-ray energy spectrum images were applied as inputs to the DCNN model,and the corresponding outputs of the convolution layers and fully connected layers were transferred as descriptors of the images to construct a new classification model for radionuclide *** transferred image descriptors consist of global and local features,where the activation vectors of fully connected layers are global features,and activations from convolution layers are local features.A series of comparative experiments between the transferred image descriptors,peak information,features extracted by the histogram of the oriented gradients(HOG),and scale-invariant feature transform(SIFT)using both synthetic and measured data were applied to 11 classical *** results demonstrate that although the gamma-ray energy spectrum images are completely unfamiliar to the DCNN model and have not been used in the pre-training process,the transferred image descriptors achieved good classification *** global features have strong semantic information,which achieves an average accuracy of 92.76%and 94.86%on the synthetic dataset and measured dataset,*** results of the statistical comparison of features demonstrate that the proposed approach outperforms the peak-se

关键词： Radionuclide identification Feature extraction Transfer learning Gamma energy spectrum analysis Image descriptor

The Boundedness of Maximal Operators and Singular Integrals via Fourier Transform Estimates

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Acta Mathematica Sinica,English Series 2012年第11期28卷 2227-2242页

作者： Hong hai liu School of Mathematics and Information Science He'nan Polytechnic University

In this paper, the author studies the mapping properties for some general maximal op- erators and singular integrals on certain function spaces via Fourier transform estimates. Also, some concrete maximal operators an... 详细信息

关键词： Maximal operators singular integrals Triebel-Lizorkin spaces vector-valued inequality

Spikes with short inter-spike intervals in frog retinal ganglion cells are more correlated with their adjacent neurons’activities

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Protein & Cell 2011年第9期2卷 764-771页

作者： Wen-Zhong liu Ru-jia Yan Wei jing hai-Qing Gong Pei-ji Liang School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Correlated firings among neurons have been extensively investigated;however,previous studies on retinal ganglion cell(RGC)population activities were mainly based on analyzing the correlated activities between the entire spike *** the present study,the correlation properties were explored based on burst-like activities and solitary spikes *** results indicate that:(1)burst-like activities were more correlated with other neurons’activities;(2)burst-like spikes correlated with their neighboring neurons represented a smaller receptive field than that of correlated solitary *** results suggest that correlated burst-like spikes should be more efficient in signal transmission,and could encode more detailed spatial information.

关键词： correlated firing burst-like spikes solitary spikes correlation index receptive field

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Acta Mathematica Sinica,English Series 2017年第7期33卷 1011-1020页

作者： Hong hai liu School of Mathematics and information Science He'nan Polytechnic UniversityJiaozuo 454003P.R.China

Abstract In this paper, we give counterexamples to show that variation and oscillation operators related to rough truncations of the Hilbert transform are not bounded from H1 to L1, and prove variation, oscillation an... 详细信息

关键词： Variation operator oscillation operator A-jump operator the Hilbert transform Hardyspace

An Adversarial Smart Contract Honeypot in Ethereum

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Computer Modeling in Engineering & Sciences 2021年第7期128卷 247-267页

作者： Yu Han Tiantian ji Zhongru Wang Hao liu hai jiang Wendi Wang Xiang Cui Key Laboratory of Trustworthy Distributed Computing and Service(BUPT) Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing100876China Chinese Academy of Cyberspace Studies Beijing100010China Qianxin Technology Group Co. Ltd.Beijing100088China Beijing DigApis Technology Co. Ltd.Beijing100081China Cyberspace Institute of Advanced Technology Guangzhou UniversityGuangzhou510006China

A smart contract honeypot is a special type of smart *** type of contract seems to have obvious vulnerabilities in contract *** a user transfers a certain amount of funds to the contract,then the user can withdraw the funds in the ***,once users try to take advantage of this seemingly obvious vulnerability,they will fall into a real ***,the user’s investment in the contract cannot be *** honeypot induces other accounts to launch funds,which seriously threatens the security of property on the *** methods for honeypots are ***,studying the manner by which to defend existing honeypots is insufficient to fight against *** new honeypots that may appear in the future from the perspective of an attacker must also be ***,we propose a type of adversarial *** code and behavioral features of honeypots are obtained through a comparative analysis of the 158,568 nonhoneypots and 352 *** build an adversarial honeypot,we try to separately hide these features and make the honeypot bypass the existing detection *** construct 18 instances on the basis of the proposed adversarial honeypot and use an open-source honeypot detection tool to detect these *** experimental result shows that the proposed honeypot can bypass the detection tool with a 100%***,this type of honeypot should be given attention,and defensive measures should be proposed as soon as possible.

关键词： Honeypot smart contract adversarial bypass detection

On Discreteness of the Hopf Equation

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Acta Mathematicae Applicatae Sinica 2008年第3期24卷 423-440页

作者： hai-liang liu Iowa State University USA

The principle aim of this essay is to illustrate how different phenomena is captured by different discretizations of the Hopf equation and general hyperbolic conservation laws. This includes dispersive schemes, shock capturing schemes as well as schemes for computing multi-valued solutions of the underlying equation. We introduce some model equations which describe the behavior of the discrete equation more accurate than the original equation. These model equations can either be conveniently discretized for producing novel numerical schemes or further analyzed to enrich the theory of nonlinear partial differential equations.

关键词： Hopf equation dispersive scheme shock capturing schemes multi-valued solutions level set equation

Holomorphic Deformations of the Ricci-flat ?-manifolds

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Acta Mathematica Sinica,English Series 2016年第6期32卷 643-658页

作者： hai Sheng liu Center of Mathematical Sciences Zhejiang University Hangzhou 310027 P. R. China

We present a construction of globally convergent power series of integrable Beltrami differentials on the Ricci-flat -manifolds and also a construction of global canonical family of holomorphic （n, 0）-forms on the... 详细信息

关键词： Deformations of complex structures Ricci-flat -manifold

Structure and Magnetic Properties of FeCo/Al_2O_3 Nanocomposites

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Chemical Research in Chinese Universities 2010年第3期26卷 344-347页

作者： LI hai-bo XU Shi-chong liu Mei FENG Ming YIN ji-zhe Institute of Condensed Matter Physics and Materials Science Jilin Normal University Siping 136000 P. R. China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 P R. China

The soft magnetic nanocomposites with equiatomic FeCo particles dispersed in Al2O3 matrix were synthesized via a sol-gel technique combined with H2 reduction method. The samples were characterized by X-ray diffraction, transmission electron microscopy and vibrating sample magnetometer. The FeCo nanoparticles in all the samples have the typical bcc structure. With the decreasing of Al2O3 content, the mean grain size of FeCo in the nanocomposites and the saturation magnetization of the samples increase, while the coercivity of samples increases firstly and then decreases due to different magnetic mechanisms.

关键词： FeCo/Al2O3 Nanocomposite Structure Magnetic property

Quantum anomalous energy effects on the nucleon mass

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 23-28页

作者： Xiangdong ji Yizhuang liu Center for Nuclear Femtography Southeastern Universities Research AssociationWashington DC 20005USA Department of Physics University of MarylandCollege ParkMD 20742USA Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China Institute fur Theoretische Physik Universitat RegensburgRegensburg D-93040Germany

Apart from the quark and gluon kinetic and potential energies, the nucleon mass includes a novel energy of pure quantum origin resulting from anomalous breaking of scale symmetry. We demonstrate the effects of this quantum anomalous energy(QAE) in QED, as well as in a toy 1+1 dimensional non-linear sigma model where it contributes non-perturbatively, in a way resembling the Higgs mechanism for the masses of matter particles in electro-weak theory. The QAE contribution to the nucleon mass can be explained using a similar mechanism, in terms of a dynamical response of the gluonic scalar field through Higgs-like couplings between the nucleon and scalar resonances. In addition, the QAE sets the scale for other energies in the nucleon through a relativistic virial theorem, and contributes a negative pressure to confine the colored quarks.

关键词： proton mass quantum anomaly spontaneous symmetry breaking scale symmetry