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Visualization Feature and CNN Based Homology Classification of Malicious Code

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Chinese Journal of Electronics 2020年第1期29卷 154-160页

作者： chu Qianfeng LIU Gongshen ZHU Xinyu School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University

The malicious code brings a serious security threat. Researchers have found that many new types of malicious code are variants of the existing *** homology classification of the unknown malicious code can find its corresponding family in which all the code share inherent similarities from the database, so that the defenders can make rapid response and *** use the algorithm of malicious code visualization to translate the homology classification problem into the image classification problem. A convolution neural network for malicious code image is constructed. We train it to complete the malicious code homology classification on two different datasets. The results show that our work outperforms most of existing work with the accuracy of 98.60%.

关键词： Malicious code Homology classification Malicious code image Convolutional neural network

Dynamic stress concentration of an elliptical cavity in a semi-elliptical hill under SH-waves

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 347-359页

作者： Qi Hui chu Fuqing Guo Jing College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China

The method of wave-function expansion in elliptical coordinates,elliptical cosine half-range expansion and Mathieu function were applied to obtain an exact analytical solution of the dynamic stress concentration factor(DSCF)around an elliptical cavity in a shallow,semi-elliptical *** infinite system of simultaneous linear equations for solving this problem was established by substituting the wave expression obtained by the Mathieu function including the standing wave expression of elliptical lining given herein into the boundary condition obtained by the region-matching *** finite equations system with unknown coefficients obtained by truncation were solved numerically,and the results in the case of an ellipse degenerating into a circle were compared with previous results to verify the accuracy of the *** effects of different aspect ratios,incident wave angles and aperture ratios on the dynamic stress concentration around the elliptical cavity were *** numerical results,when the elliptical hill was changed into a circular one,were analyzed and compared in *** engineering,this model can be regarded as a semi-cylindrical hill with an elliptical cylindrical unlined tunnel under the action of SH waves,and the results are significant in aseismic design.

关键词： SH waves dynamic stress concentration factor(DSCF) elliptical coordinate Mathieu function

Time-dependent safety of lining structures of circular tunnels in weak rock strata

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International Journal of Mining Science and Technology 2022年第2期32卷 323-334页

作者： Baoguo Liu Yu Song Zhaofei chu School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China School of Civil Engineering Wuhan UniversityWuhan 430072China

Following tunnel excavation and lining completion,fractured surrounding rock deforms gradually over time;this results in a time-dependent evolution of the pressure applied to the lining structure by the surrounding ***,the safety of the tunnel lining in weak strata is strongly correlated with *** this study,we developed an analytical method for determining the time-dependent pressure in the surrounding rock and lining structure of a circular tunnel under a hydrostatic stress *** the proposed method,the stress–strain relationship of the fractured surrounding rock is assumed to conform to that of the Burgers viscoelastic component,and the lining structure is assumed to be an *** on these assumptions,the viscoelastic deformation of the surrounding rock,the elastic deformation of the lining structure,and the coordinated deformation between the surrounding rock and lining structure were *** proposed analytical method,which employs a time-dependent safety coefficient,was subsequently used to estimate the durability of the lining structure of the Foling Tunnel in *** derived attenuation curve of the safety coefficient with respect to time can assist engineers in predicting the remaining viable life of the lining *** existing analytical methods,the method derived in this study considers the time dependency of the interaction between the surrounding rock and tunnel lining;hence,it is more suitable for the evaluation of lining lifetime.

关键词： Tunnel lining Surrounding rock pressure Rheological characteristics Weak rock strata Time-dependent safety

Selective production of acetol or methyl lactate from cellulose over RuSn catalysts

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Journal of Energy Chemistry 2022年第10期31卷 607-614,I0015页

作者： Dawang chu Zhicheng Luo Chen Zhao Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Institute of Eco-Chongming Shanghai 202162China

Designing a catalytic system that could convert cellulose to switchable C3 alcohols or esters with controllable selectivity is highly desired to meet the rapidly changing market ***,we develop RuSn catalysts with the altering Sn loadings that can achieve acetol formation from cellulose hydrogenation at240℃in presence of H_(2)or yield methyl lactate production from cellulose conversion in methanol and water mixture at 200℃in presence of N_(2).The increased Sn contents from 3%to 6%lead to form different surface sites from Ru_(3)Sn_(7),Ru,and SnO_(x)to Ru_(3)Sn_(7)and SnO_(x).The integrated Ru_(3)Sn_(7),Ru,and SnO_(x)species on 1.5%Ru-3%Sn/SiO_(2)catalyze isomerization,retro-aldol condensation,and hydrogenation individual steps with coordinated reaction rates,resulting in the acetol formation with a high yield of 53.7 C%.Furthermore,the optimum combination of Ru_(3)Sn_(7)and SnO_(x)on 1.5%Ru-6%Sn/SiO_(2)contributes to the isomerization,retro-aldol condensation,dehydration,and 1,2-hydride shift,giving rise to the preferential production of methyl lactate at a 25.1 C%*** results illustrate the feasibility of controlling the selective conversion of cellulose to C3 acetol or methyl lactate by devising a tunable catalytic system,which guides the rational design of catalysts for the selective conversion of cellulose.

关键词： Cellulose conversion RuSn catalysts Methyl lactate Acetol Switchable production

Fluidization dynamic characteristics of carbon nanotube particles in a tapered fluidized bed

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Chinese Journal of Chemical Engineering 2022年第4期35卷 321-331页

作者： Wenjuan Bai Dianming chu Yan He Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials College of Electromechanical EngineeringQingdao University of Science and TechnologyShandong 266061China

In this work,a tapered fluidized bed(TFB)without a distributor for fluidizing carbon nanotube(CNT)was applied for improving the dead zone,blockage,and fracture of distributor,which occurred in actual *** were performed under different superficial gas velocities,static bed heights,CNT agglomerate size,and positions of pressure *** obtain multi-perspective and multi-scale understanding of fluidization dynamics of gas–CNT flow in the TFB without a distributor,the standard deviation,skewness,kurtosis,wavelet decompositions and homogeneous index analysis methods were *** noticeable phenomena were *** movements including inter-particle,gas–particle and particle–wall dominate dynamic *** amplitudes of pressure fluctuations of coarse agglomerated multi-walled CNT were more sensitive to the gas velocity than that of fine agglomerated multi-walled *** sensitively of energy contribution of the meso-and macrostructures was that the sensitivity of the measured position was less than the sensitivity of the energy contribution by the changes of particle size,and the sensitivity of the energy contribution by the changes of particle size was less than the energy contribution by the changes of gas *** fluidization quality of coarse agglomerated multi-walled CNT was better than that of fine agglomerated multi-walled CNT,which was verified by the skewness and wavelet analysis.

关键词： Tapered fluidized bed Gas–CNT flow Pressure fluctuation Wavelet Homogeneous index Carbon nanotubes

Managing Sales Channel Selection for a Manufacturer in the Presence of Remanufacturing

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Journal of Systems Science and Systems Engineering 2021年第5期30卷 600-625页

作者： Benrong Zheng Niu Yu Jie chu College of Economics and Management Huazhong Agricultural UniversityWuhan 430070China School of Management Wuhan Textile UniversityWuhan 430073China International Business School Suzhou Xi'an Jiaotong-Liverpool UniversitySuzhou 215123China

Motivated by the fact that the product remanufacturing operations are increasingly performed as firms,competitive advantage and may also play an important role in the choice of channel structure,we construct game-theoretical models to examine the manufacturer's optimal sales channel strategy in a closed-loop supply chain(CLSC),in which the manufacturer is responsible for used product recycling and remanufacturing and the retailer operates a traditional retail *** show that the manufacturer's optimal sales channel selection depends on the customers7 acceptance of the direct channel and the remanufacturing ***,in the centralized system,the manufacturer would prefer the dual-channel strategy rather than either the exclusive direct or retail channel,and becomes more willing to introduce a direct channel as the remanufacturing cost savings ***,in a decentralized system,there exists a Pareto improvement zone where both the manufacturer and the retailer are better off in the dual-channel format,and the increasing remanufacturing efficiency spills over to the retailer via a lower wholesale price and thus a higher retail ***,we extend the study to the retailer-collecting mode and demonstrate that the main results of the original model remain robust.

关键词： Remanufacturing closed-loop supply chain(CLSC) dual-channel sales channel selection game theory

Process metallurgy and data-driven prediction and feedback of blast furnace heat indicators

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1228-1240页

作者： Quan Shi Jue Tang Mansheng chu School of Metallurgy Northeastern UniversityShenyang 110819China Institute for Frontier Technologies of Low-carbon Steelmaking Northeastern UniversityShenyang 110819China Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking(Ministry of Education) Shenyang 110819China

The prediction and control of furnace heat indicators are of great importance for improving the heat levels and conditions of the complex and difficult-to-operate hour-class delay blast furnace(BF)*** this work,a prediction and feedback model of furnace heat indicators based on the fusion of data-driven and BF ironmaking processes was *** data on raw and fuel materials,process op-eration,smelting state,and slag and iron discharge during the whole BF process comprised 171 variables with 9223 groups of data and were comprehensively analyzed.A novel method for the delay analysis of furnace heat indicators was *** extracted delay variables were found to play an important role in *** method that combined the genetic algorithm and stacking efficiently im-proved performance compared with the traditional machine learning algorithm in improving the hit ratio of the furnace heat prediction *** hit ratio for predicting the temperature of hot metal in the error range of±10℃ was 92.4%,and that for the chemical heat of hot metal in the error range of±0.1wt%was 93.3%.On the basis of the furnace heat prediction model and expert experience,a feedback model of furnace heat operation was established to obtain quantitative operation suggestions for stabilizing BF heat *** sugges-tions were highly accepted by BF ***,the comprehensive and dynamic model proposed in this work was successfully ap-plied in a practical BF *** improved the BF temperature level remarkably,increasing the furnace temperature stability rate from 54.9%to 84.9%.This improvement achieved considerable economic benefits.

关键词： blast furnace furnace heat genetic algorithm stacking prediction and feedback

A Cross Layer Protocol for Fast Identification of Blocked Tags in Large-Scale RFID Systems

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Computers, Materials & Continua 2020年第9期64卷 1705-1724页

作者： chu chu Zhong Huang Rui Xu Guangjun Wen Lilan Liu School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu611731China School of Engineering University of British ColumbiaKelownaV1V 1V7Canada

Blocker tag attack is one of the denial-of-service(DoS)attacks that threatens the privacy and security of RFID *** attacker interferes with the blocked tag by simulating a fake tag with the same ID,thus causing a collision of message *** many practical scenarios,the number of blocked tags may vary,or even be *** example,the attacker may only block the important customers or high-value *** avoid the disclosure of privacy and economic losses,it is of great importance to fast pinpoint these blocked ***,existing works do not take into account the impact of the number of blocked tags on the execution time and suffer from incomplete identification of blocked tags,long identification time or privacy *** overcome these limits,we propose a cross layer blocked tag identification protocol(CLBI).CLBI consists of multiple rounds,in which it enables multiple unblocked tags to select one time slot and concurrently verify them by using tag estimation in physical *** from the utilization of most collision slots,the execution time can be greatly ***,for efficient identification of blocked tags under different proportions,we propose a hybrid protocol named adaptive cross layer blocked tag identification protocol(A-CLBI),which estimates the remaining blocked tag in each round and adjusts the identification strategy *** simulations show that our protocol outperforms state-of-the-art blocked tags identification protocol.

关键词： RFID blocked tag physical layer estimation identification

Multiphoton quantum dynamics of many-electron atomic and molecular systems in intense laser fields

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Chinese Physics B 2020年第8期29卷 115-126页

作者： Peng-Cheng Li Shih-I chu Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou UniversityShantou 515063China Department of Chemistry University of KansasLawrenceKansas 66045USA

We present the recent new developments of time-dependent Schrödinger equation and time-dependent density-functional theory for accurate and efficient treatment of the electronic structure and time-dependent quantum dynamics of many-electron atomic and molecular systems in intense laser *** extend time-dependent generalized pseudospectral(TDGPS)numerical method developed for time-dependent wave equations in multielectron *** TDGPS method allows us to obtain highly accurate time-dependent wave functions with the use of only a modest number of spatial grid point for complex quantum dynamical *** usefulness of these procedures is illustrated by a few case studies of atomic and molecular processes of current interests in intense laser fields,including multiphoton ionization,above-threshold ionization,high-order harmonic generation,attosecond pulse generation,and quantum dynamical processes related to multielectron *** conclude this paper with some open questions and perspectives of multiphoton quantum dynamics of many-electron atomic and molecular systems in intense laser fields.

关键词： multiphoton ionization above-threshold ionization high-order harmonic generation attosecond pulse generation