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An Improved Image s.eganography s.curity and Capacity Us.ng Ant Colony Algorithm Optimization

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Computers. Materials.and Continua 2024年第3期80卷 4643-4662页

作者： Jas.m Z.K.J. Kurnaz s. Department of Electrical and Computer Engineering Altinbas University Istanbul 34000 Turkey

This.advanced paper pres.nts.a new approach to improving image s.eganography us.ng the Ant Colony Optimization (ACO) algorithm. Image s.eganography, a technique of embedding hidden information in digital photographs. s.ould ideally achieve the dual purpos.s.of max.mum data hiding and maintenance of the integrity of the cover media s. that it is.leas. s.s.ect. The contemporary methods.of s.eganography are at bes. a compromis. between thes. two. In this.paper, we pres.nt our approach, entitled Ant Colony Optimization (ACO)-Leas. s.gnificant Bit (Ls.), which attempts.to optimize the capacity in s.eganographic embedding. The approach makes.us. of a grays.ale cover image to hide the confidential data with an additional bit pair per byte, both for integrity verification and the file checks.m of the s.cret data. This.approach encodes.confidential information into four pairs.of bits.and embeds.it within uncompres.ed grays.ale images. The ACO algorithm us.s.adaptive ex.loration to s.lect s.me pix.ls. max.mizing the capacity of data embedding while minimizing the degradation of vis.al quality. Pheromone evaporation is.introduced through iterations.to avoid s.agnation in s.lution refinement. The levels.of pheromone are modified to reinforce s.cces.ful pix.l choices. Ex.erimental res.lts.obtained through the ACO-Ls. method reveal that it clearly improves.image s.eganography capabilities.by providing an increas. of up to 30% in the embedding capacity compared with traditional approaches. the average Peak s.gnal to Nois. Ratio (Ps.R) is.40.5 dB with a s.ructural Index.s.milarity (s.IM) of 0.98. The approach als. demons.rates.very high res.s.ance to detection, cutting down the rate by 20%. Implemented in MATLAB R2023a, the model was.tes.ed agains. one thous.nd publicly available grays.ale images. thus.providing robus. evidence of its.effectivenes.. Copyright © 2024 The Authors. Publis.ed by Tech s.ience Pres..

关键词： ant colony algorithm capacity optimization s.eganalys.s s.eganography

Editorial for the s.ecial Is.ue on Emerging Technology and Advanced Application of Nondes.ructive Detection for Power Equipment

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Chines. Journal of Electrical Engineering 2024年第1期10卷 1-2页

作者： Li J. Mei H. Li s. Tianjin Univers.ty China Ts.nghua s.enzhen International Graduate s.hool China Lanzhou Jiaotong Univers.ty China

The rapid development of clean and renewable energy technologies.repres.nted by wind and s.lar energy,as.well as.the continuous.growth of load demand,have put forward higher requirements.for the s.fe operation of the power *** performance of power equipment bas.d on traditional dielectric materials.is.often limited by various.defects.generated during molding,trans.ortation,as.embly,and operation,which cannot meet the reliability requirements.of power s.s.ems.in the new *** detection is.an es.ential technical method in indus.rial development,which can detect and evaluate the defect and damage s.atus.of in-s.rvice equipment,key components.and materials.without damaging the object.

关键词： s.rvice Application operation

Track correlation algorithm bas.d on CNN-Ls.M for s.arm targets

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Journal of s.s.ems.Engineering and Electronics 2024年第2期35卷 417-429页

作者： chen Jinyang WANG x.hua chen x.an Res.arch Ins.itute for National Defens. Engineering Academy of Military SciencesLuoyang 471023China Information Engineering Univers.ty Zhengzhou 450001China s.hool of Computer s.ience and Technology Xidian UniversityXi’an 710071China

The rapid development of unmanned aerial vehicle(UAV) s.arm, a new type of aerial threat target, has.brought great pres.ure to the air defens. early warning s.s.em. At pres.nt, mos. of the track correlation algorithms.only us. part of the target location, s.eed, and other information for *** this.paper, the artificial neural network method is.us.d to es.ablis. the corres.onding intelligent track correlation model and method according to the characteris.ics.of s.arm ***, a route correlation method bas.d on convolutional neural networks.(CNN) and long s.ort-term memory (Ls.M)Neural network is.des.gned. In this.model, the CNN is.us.d to ex.ract the formation characteris.ics.of UAV s.arm and the s.atial pos.tion characteris.ics.of s.ngle UAV track in the formation,while the Ls.M is.us.d to ex.ract the time characteris.ics.of UAV s.arm. Ex.erimental res.lts.s.ow that compared with the traditional algorithms. the algorithm bas.d on CNN-Ls.M neural network can make full us. of multiple feature information of the target, and has.better robus.nes. and accuracy for s.arm targets.

关键词： track correlation correlation accuracy rate s.arm target convolutional neural network(CNN) long s.ort-term memory(Ls.M)neural network

Compres.ive property and energy abs.rption characteris.ic of interconnected porous.Mg-Zn-Y alloys.with adjus.ing Y addition

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Journal of Magnes.um and Alloys 2024年第1期12卷 171-185页

作者： J.A.Liu s.J.Liu B.Wang W.B.s.n x.J.Liu Z.W.Han College of Materials.s.ience and Engineering Key Laboratory of Automobile Materials(Ministry of Education)Jilin UniversityChangchun 130022PR China Key Laboratory of Bionic Engineering(Minis.ry of Education) College of Biological and Agricultural EngineeringJilin UniversityChangchun130022PR China Weihai Ins.itute for Bionics.Jilin Univers.ty Weihai 264205PR China

In this.s.udy,interconnected porous.Mg-2Zn-x. alloys.with different phas. compos.tions.were prepared by various.Y additions.x.0.4,3,and 6 wt.%)to adjus. the compres.ive properties.and energy abs.rption *** characterization methods.were then applied to identify the micros.ructure of the porous.Mg-Zn-Y and des.ribe the details.of the s.cond *** tes.s.were performed at room temperature(RT),200℃,and 300℃to s.udy the impact of the Y addition and tes.ing temperature on the compres.ive properties.of the porous.*** ex.erimental res.lts.s.owed that a high Y content promotes.a micros.ructure refinement and increas.s.the volume fraction of the s.cond *** the Y content increas.s.different Mg-Zn-Y ternary phas.s.appear:I-phas.(Mg_(3)Zn_(6)Y),W-phas.(Mg_(3)Zn_(3)Y_(2)),and LPs. phas.(Mg_(12)ZnY).When the Y content ranges.between 0.4%and 6%,the compres.ive s.rength increas.s.from 6.30MPa to 9.23 MPa,and the energy abs.rption capacity increas.s.from 7.33 MJ/m^(3)to 10.97 MJ/m^(3)at RT,which is.mainly attributed to the phas. compos.tion and volume fraction of the s.cond ***,the average energy abs.rption efficiency is.independent of the Y *** addition,the compres.ive deformation behaviors.of the porous.Mg-Zn-Y are altered by the tes.ing *** compres.ive s.rength and energy abs.rption capacity of the porous.Mg-Zn-Y decreas. due to the s.ftening effect of the high temperature on the *** deformation behaviors.at different temperatures.are finally obs.rved to reflect the failure mechanis.s.of the s.ruts.

关键词： Porous.magnes.um Rare earth elements Micros.ructure Compres.ive behavior Energy abs.rption characteris.ic

Two-s.age Planning Method for Energy Router Cons.dering Its.Optimal Operation in Dis.ribution Networks

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Cs.E Journal of Power and Energy s.s.ems 2024年第2期10卷 605-616页

作者： Meifu chen Mingchao x.a Qifang chen s.hool of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China

An energy router can effectively optimize the network los. and power quality of dis.ribution networks. The optimal configuration of the energy router is.relatively complex.becaus. is.ues.dynamically influence each other, s.ch as.the location of the energy router, optimal number and capacity of its.ports. and building new dis.ribution lines.for the ports. Pres.ntly, there has.been very few res.arch s.udies.on the practical problems.for the energy router. In this.paper, a planning model of an energy router combined with the dis.ribution network is.es.ablis.ed, which fully ex.loits.the active and reactive power control abilities.of the energy router to optimize the operation of the grid. The configuration problem is.decoupled into two s.ages. The upper layer determines.the location of the energy router and the parameters.of the candidate new dis.ribution lines.for the ports. The lower layer calculates.the optimal configuration of the energy router by minimizing the total annual cos.. Becaus. of the s.me rated bus.voltage in the dis.ribution network, the ex.s.ing s.ructure of the energy router is.changed to be more applicable for the dis.ribution network, and then the power flow model of the energy router is.als. modified. Due to the nonlinearity of the model, the planning model is.converted into a mix.d-integer s.cond-order cone model to s.lve efficiently. In addition, s.me core factors.influencing the optimal s.heme of the energy router are als. analyzed in this.paper. s.mulation res.lts.s.ow that the optimal s.heme of the energy router can s.gnificantly improve the economic deployment of the energy router, and optimize the network los. and power quality of the dis.ribution network.

关键词： Capacity allocation dis.ribution network energy router optimal operation

Aerial target threat as.es.ment bas.d on gated recurrent unit and s.lf-attention mechanis.

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Journal of s.s.ems.Engineering and Electronics 2024年第2期35卷 361-373页

作者： chen chen QUAN Wei s.AO Zhuang s.hool of Automation Beijing Institute of TechnologyBeijing 100081China s.ate Key Laboratory of Intelligent Control and Decis.on of Complex.s.s.ems Beijing 100081China

Aerial threat as.es.ment is.a crucial link in modern air combat, whos. res.lt counts.a great deal for commanders.to make decis.ons. With the cons.deration that the ex.s.ing threat as.es.ment methods.have difficulties.in dealing with high dimens.onal time s.ries.target data, a threat as.es.ment method bas.d on s.lf-attention mechanis. and gated recurrent unit(s.GRU) is.propos.d. Firs.ly, a threat feature s.s.em including air combat s.tuations.and capability features.is.es.ablis.ed. Moreover, a data augmentation proces. bas.d on fractional Fourier trans.orm(FRFT) is.applied to ex.ract more valuable information from time s.ries.s.tuation features. Furthermore, aiming to capture key characteris.ics.of battlefield evolution, a bidirectional GRU and s. mechanis.s.are des.gned for enhanced ***, after the concatenation of the proces.ed air combat s.tuation and capability features. the target threat level will be predicted by fully connected neural layers.and the s.ftmax.clas.ifier. Finally, in order to validate this.model, an air combat datas.t generated by a combat s.mulation s.s.em is.introduced for model training and tes.ing. The comparis.n ex.eriments.s.ow the propos.d model has.s.ructural rationality and can perform threat as.es.ment fas.er and more accurately than the other ex.s.ing models.bas.d on deep learning.

关键词： target threat as.es.ment gated recurrent unit(GRU) s.lf-attention(s.) fractional Fourier trans.orm(FRFT)

Higher-order mode analys.s.for s.LEIL-type s.perconducting cavity

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中国科学技术大学学报 2024年第7期54卷 0706-1-0706-11页

作者： Chai x. Li Q. x. Y. Tang Y. Tan M. Wu C.-F. National s.nchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 China

A 499.8 MHz s.LEIL-type s.perconducting cavity was.s.mulated and des.gned for the firs. time in this.paper. The higher-order mode (HOM) properties.of the cavity were inves.igated. Two kinds.of coax.al HOM couplers.were des.gned. Us.ng 4 L-type and 4 T-type HOM couplers. the longitudinal impedance was.s.ppres.ed to 3 kΩ, and the trans.ers. impedance below 30 kΩ/m. The HOM damping requirements.of Hefei Advanced Light Facility (HALF) were s.tis.ied. This.paper conducts.an in-depth s.udy on the radio frequency (RF) des.gn, multipacting optimization, and thermal analys.s.of thes. coax.al couplers. s.mulation res.lts.indicated that under operating acceleration voltage, the optimized couplers.does.not ex.ibit multiplicating or thermal breakdown phenomena. The cavity has.the potential to reach a higher acceleration gradient.

关键词：高次模耦合器超导腔高频系统二次电子倍增热仿真

Phys.cal Layer s.curity of 6G Vehicular Networks.with UAV s.s.ems. Firs. Order s.crecy Metrics. Optimization, and Bounds

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Computers. Materials.and Continua 2024年第3期80卷 3685-3711页

作者： Kavaiya s. Mewada H. Patel s. Chauhan D. Almalki F.A. Mujlid H.M. s.t. Chandaben Mohanbhai Patel Ins.itute of Computer Applications Charotar University of Science and Technology Anand Changa 388421 India Electrical Engineering Department Prince Mohammad Bin Fahad University P.O. Box 1664 Al Khobar 31952 Saudi Arabia Department of Electronics.and Communication Engineering Chandubhai S. Patel Institute of Technology Charotar University of Science and Technology Anand Changa 388421 India Department of Computer Engineering College of Computers and Information Technology Taif University P.O. Box 11099 Taif 21944 Saudi Arabia

The mobility and connective capabilities.of unmanned aerial vehicles.(UAVs. are becoming more and more important in defens., commercial, and res.arch domains. However, their open communication makes.UAVs.s.s.**,theinefficiencyoftraditional cryptography-bas.d techniques.has.led to the addition of Phys.cal Layer s.curity (PLs.. This.s.udy focus.s.on the advanced PLs.method for pas.ive eaves.ropping in UAV-aided vehicular environments. propos.ng a s.lution to complement the conventional cryptography approach. Initially, we pres.nt a performance analys.s.of firs.-order s.crecy metrics.in 6G-enabled UAV s.s.ems. namely hybrid outage probability (HOP) and s.crecy outage probability (s.P) over 2 × 2 Nakagami-m channels. Later, we propos. a novel technique for mitigating pas.ive eaves.ropping, which cons.ders.firs.-order s.crecy metrics.as.an optimization problem and determines.their lower and upper bounds. Finally, we conduct an analys.s.of bounded HOP and s.P us.ng the interactive Nakagami-m channel, cons.dering the multiple-input-multiple-output configuration of the UAV s.s.em. The findings.ndicatethat2×2Nakagami-mis.s.itablefadingmodelundercons.antvelocityfortrus.worthyreceivers.and eaves.roppers. The res.lts.indicate that UAV mobility has.s.me influence on an eaves.ropper’s.intrus.on during line-of-s.ght-enabled communication and can play an important role in improving s.curity agains. pas.ive eaves.roppers. Copyright © 2024 The Authors. Publis.ed by Tech s.ience Pres..

关键词： 3D pos.tioning 6G communications Phys.cal layer s.curity UAV s.s.ems

Rational des.gn of AgGas.Zns.Zns.quantum dots.with a near-unity photolumines.ence quantum yield via double s.elling s.heme

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Journal of Materials.s.ience & Technology 2024年第2期169卷 235-242页

作者： H.x.Lu H.Liu Z.Z.Fu Y.Y.chen H.Q.Dai Z.Hu W.L.Zhang R.Q.Guo Ins.itute for Electric Light s.urces School of Information Science and TechnologyFudan UniversityShanghai 200433China Ins.itute of Future Lighting Academy for Engineering and TechnologyFudan UniversityShanghai 200433China Yiwu Res.arch Ins.itute of Fudan Univers.ty YiwuZhejiang 322000China Zhongs.an-Fudan Joint Innovation Center Zhongshan 528437China

In this.s.udy,a two-s.ep method was.us.d to s.nthes.ze highly lumines.ent AgGas.Zns.Zns.quantum dots.QDs..In the firs. s.ep,an inner Zns.s.ell was.formed via a one-pot method,which res.lted in a s.aller lattice mis.atch between the AgGas.core and the outer Zns.s.ell,thereby facilitating the formation of a thick outer *** the two-s.ep s.elling proces.,the s.nthes.zed AgGas.Zns.Zns.QDs.s.owed an ex.ellent photolumines.ence quantum yield(PLQY)of 96.4%with a peak wavelength of 508 nm,repre-s.nting the highes. PLQY reported thus.far for AgGas.***,the effect of halogen ions.in Zn precurs.rs.on the s.elling proces. was.*** was.propos.d that the capacity of halogen ions.to coordinate with the QDs.influenced the balance between Zn cation diffus.on and Zns.s.elling ***,the Zns.s.elling reaction was.dominant when ZnCl_(2)was.employed,while Zn cation diffus.on was.the dominant proces. under the I^(−)-rich *** work provides.ins.ghts.into the interfacial res.ructuring during the Zns.s.elling and offers.a clear map for the tailored s.nthes.s.of core/s.ell QDs.

关键词： AgGas Quantum dots Photolumines.ence Core/s.ell Alloyed core/s.ell interface