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Combined CNN LSTM with attention for speech emotion recognition based on feature-level fusion

Multimedia Tools and Applications 2024年第21期83卷 59839-59859页

作者： Liu, Yanlin Chen, Aibin Zhou, Guoxiong Yi, Jizheng Xiang, Jin Wang, Yaru Institute of Artificial Intelligence Application College of Computer and Information Engineering Central South University of Forestry and Technology Hunan Changsha410004 China Hunan Key Laboratory of Intelligent Logistics Technology Central South University of Forestry and Technology Hunan Changsha410004 China

According to the problem that emotional features cannot be well represented by a single feature and it is difficult to extract in the task of Speech Emotion Recognition (SER), we propose a Feature-Level (FL) fusion method for 9 types of acoustic features and a combined CNN-LSTM network with attention (CNN-A-LSTM). The feature vector set after feature-level fusion is used as the input of CNN-A-LSTM network, which contains prosodic features and spectral features. High-level Statistical Functions (HSFs) are also added to receive global features. The feature extraction network CNN-A-LSTM can more effectively read time-series input and extract speech emotion information. Finally, Softmax is applied as a classifier to obtain the final emotion classification results. The experiment is verified on SAVEE and CASIA datasets. The experimental results show that the method in this paper has the best effect compared with the state-of-the-art, and the accuracy rates of 94.5% and 96.7% are respectively gained on SAVEE and CASIA. The above results prove the effectiveness of the algorithm in this paper with some generalization. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2023.

关键词： Speech recognition

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A Heuristic Radiomics Feature Selection Method Based on Frequency Iteration and Multi-Supervised Training Mode

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Computers, Materials & Continua 2024年第5期79卷 2277-2293页

作者： Zhigao Zeng Aoting Tang Shengqiu Yi Xinpan Yuan Yanhui Zhu School of Computer Hunan University of TechnologyZhuzhou412007China Hunan Key Laboratory of Intelligent Information Perception and Processing Technology Zhuzhou412007China

Radiomics is a non-invasive method for extracting quantitative and higher-dimensional features from medical images for *** has received great attention due to its huge application prospects in recent *** can know that the number of features selected by the existing radiomics feature selectionmethods is basically about *** this paper,a heuristic feature selection method based on frequency iteration and multiple supervised training mode is *** on the combination between features,it decomposes all features layer by layer to select the optimal features for each layer,then fuses the optimal features to form a local optimal group layer by layer and iterates to the global optimal combination *** with the currentmethod with the best prediction performance in the three data sets,thismethod proposed in this paper can reduce the number of features fromabout ten to about three without losing classification accuracy and even significantly improving classification *** proposed method has better interpretability and generalization ability,which gives it great potential in the feature selection of radiomics.

关键词： Radiomics feature selection machine learning metaheuristic

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Rational molecular design of P-doped porous carbon material for the VOCs adsorption

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Chinese Journal of Chemical Engineering 2025年第3期79卷 155-163页

作者： Changqing Su Wentao Jiang Yang Guo Guodong Yi Zengxing Li Huan Li Hunan Key Laboratory of Carbon Neutrality and Intelligent Energy School of Resources & Environment Hunan University of Technology and Business Xiangjiang Laboratory School of Advanced Interdisciplinary Studies Research Institute for Big Data & Internet Innovation Hunan University of Technology and Business Industry Training Center Shenzhen Polytechnic University

The objective of this study was to identify and synthesize functional groups for the efficient adsorption of volatile organic compounds（VOCs） through a combination of theoretical calculations,molecular design,and experimental *** density functional theory（DFT） calculation,focusing on the P-containing functional groups,showed that methanol adsorption was dominated by the electrostatic interaction between the carbon surface and methanol,while toluene was mainly trapped through π-π dispersive interaction between toluene molecule and functional group *** experimental results showed the phosphorus-doped carbon materials（PCAC） prepared by directly activating potassium phytate had a phosphorus content of up to 4.5%（atom）,mainly in the form of C—O—P（O）(OH)*** material exhibited a high specific area(987.6 m2·g-1) and a large adsorption capacity for methanol(440.0 mg·g-1) and toluene(350.1 mg·g-1).These properties were superior to those of the specific commercial activated carbon（CAC）sample used for comparison in this *** adsorption efficiencies per unit specific surface area of PCAC were 0.45 mg·g-1m2for methanol and 0.35 mg·g-1·m-2for *** study provided a novel theoretical and experimental framework for the molecular design of polarized elements to enhance the adsorption of polar gases,offering significant advancements over existing commercial solutions.

关键词： Adsorption Density functional theory Doped porous carbon Molecular design VOCs

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Material Removal Characteristics of Single-Crystal 4H-SiC Based on Varied-Load Nanoscratch Tests

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 125-138页

作者： Kun Tang Wangping Ou Cong Mao Jie Liang Moke Zhang Mingjun Zhang Yongle Hu Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China

Single-crystal silicon carbide(SiC)has been widely applied in the military and civil fields because of its excellent physical and chemical ***,as is typical in hard-to-machine materials,the good mechanical properties result in surface defects and subsurface damage during precision or ultraprecision *** this study,single-and double-varied-load nanoscratch tests were systematically performed on single-crystal 4H-SiC using a nanoindenter system with a Berkovich *** material removal characteristics and cracks under different planes,indenter directions,normal loading rates,and scratch intervals were analyzed using SEM,FIB,and a 3D profilometer,and the mechanisms of material removal and crack propagation were *** results showed that the Si-plane of the single-crystal 4H-SiC and edge forward indenter direction are most suitable for material removal and *** normal loading rate had little effect on the scratch depth,but a lower loading rate increased the ductile region and critical depth of ***,the crack interaction and fluctuation of the depth-distance curves of the second scratch weakened with an increase in the scratch interval,the status of scratches and chips changed,and the comprehensive effects of the propagation and interaction of the three cracks resulted in material fractures and chip *** calculated and experimental values of the median crack depth also showed good consistency and ***,this study provides an important reference for the high-efficiency and precision machining of single-crystal SiC to ensure high accuracy and a long service life.

关键词： Single crystal silicon carbides Varied-load nanoscratch Material removal Crack propagation

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Solvent-stabilized few-layer violet phosphorus and its ultrafast nonlinear optics

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Nano Research 2023年第4期16卷 5843-5849页

作者： Li Zhou Jianlong Kang Yulan Dong Yiduo Wang Yejun Li Han Huang Si Xiao Yingwei Wang Jun He Hunan Key Laboratory of Nanophotonics and Devices School of Physics and ElectronicsCentral South UniversityChangsha 410083China Key Laboratory of Hunan Province for Statistical Learning and Intelligent Computation School of Mathematics and StatisticsHunan University of Technology and BusinessChangsha 410205China

Featured with high thermal decomposition temperature and layered structure,violet phosphorus(VP)offers an unparalleled stable allotrope of phosphorus to demonstrate the optoelectronic device and photonics elements with high performance at the ***,we report few-layer and hundreds of nanometer-sized VP with robust stability in different solvents and ambient conditions by ultrasound-assisted liquid phase exfoliation *** the first time,the ultrafast carrier dynamics and thirdorder nonlinear optical response of VP were ***-picosecond timescale ultrafast carrier dynamic and ultrafast nonlinear saturable absorption of VP were *** findings demonstrated that VP possessed a promising potential for use in ultrafast nonlinear photonic applications such as saturable absorbers and optical switches.

关键词： violet phosphorus stability ultrafast nonlinear optics saturable absorption

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Phonon transport properties of Janus Pb_(2)XAs(X=P,Sb,and Bi)monolayers:A DFT study

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Chinese Physics B 2024年第4期33卷 71-76页

作者：耿嘉鑫张培汤准韵欧阳滔 School of Physics and Optoelectronics and Hunan Key Laboratory for Micro-Nano Energy Materials and Device Xiangtan UniversityXiangtan 411105China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and ElectronicsHunan University of Science and TechnologyXiangtan 411201China

Grasping the underlying mechanisms behind the low lattice thermal conductivity of materials is essential for the efficient design and development of high-performance thermoelectric materials and thermal barrier coating *** this paper,we present a first-principles calculations of the phonon transport properties of Janus Pb_(2)PAs and Pb_(2)SbAs *** materials possess low lattice thermal conductivity,at least two orders of magnitude lower than graphene and *** room temperature thermal conductivity of Pb_(2)SbAs(0.91 W/m K)is only a quarter of that of Pb_(2)PAs(3.88 W/m K).We analyze in depth the bonding,lattice dynamics,and phonon mode level information of these ***,it is determined that the synergistic effect of low group velocity due to weak bonding and strong phonon anharmonicity is the fundamental cause of the intrinsic low thermal conductivity in these Janus *** regular residual analysis further indicates that the four-phonon processes are limited in Pb_(2)PAs and Pb_(2)SbAs,and the three-phonon scattering is sufficient to describe their *** this study,the thermal transport properties of Janus Pb_(2)PAs and Pb_(2)SbAs monolayers are illuminated based on fundamental physical mechanisms,and the low lattice thermal conductivity endows them with the potential applications in the field of thermal barriers and thermoelectrics.

关键词： lattice thermal conductivity weak bonding phonon anharmonicity first principles calculations

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Micro-Expression Recognition Based on Spatio-Temporal Feature Extraction of key Regions

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Computers, Materials & Continua 2023年第10期77卷 1373-1392页

作者： Wenqiu Zhu Yongsheng Li Qiang Liu Zhigao Zeng College of Computer Science Hunan University of TechnologyZhuzhou412007China Intelligent Information Perception and Processing Technology Hunan Province Key LaboratoryZhuzhou412007China

Aiming at the problems of short duration,low intensity,and difficult detection of micro-expressions(MEs),the global and local features of ME video frames are extracted by combining spatial feature extraction and temporal feature *** on traditional convolution neural network(CNN)and long short-term memory(LSTM),a recognition method combining global identification attention network(GIA),block identification attention network(BIA)and bi-directional long short-term memory(Bi-LSTM)is *** the BIA,the ME video frame will be cropped,and the training will be carried out by cropping into 24 identification blocks(IBs),10 IBs and uncropped *** alleviate the overfitting problem in training,we first extract the basic features of the preprocessed sequence through the transfer learning layer,and then extract the global and local spatial features of the output data through the GIA layer and the BIA layer,*** the BIA layer,the input data will be cropped into local feature vectors with attention weights to extract the local features of the ME frames;in the GIA layer,the global features of the ME frames will be ***,after fusing the global and local feature vectors,the ME time-series information is extracted by *** experimental results show that using IBs can significantly improve the model’s ability to extract subtle facial features,and the model works best when 10 IBs are used.

关键词： Micro-expression recognition attention mechanism long and short-term memory network transfer learning identification block

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Optimization Method of Scanning Strategy for Reactive Ion Beam Etching of Large Aperture Grating Elements 7

Optimization Method of Scanning Strategy for Reactive Ion Be...

引用

7th Global intelligent Industry Conference, GIIC 2024

作者： Zhang, Bo Zhang, Longxiang Chang, Xuran Ma, Xunchang Zhang, Cheng Xiao, Wentong Shi, Feng Zhou, Gang Peng, Xing College of Intelligent Science and Technology National University of Defense Technology Hunan Changsha410073 China Hunan Provincial Key Laboratory of Ultra-Precision Machining Technology Hunan Changsha410073 China Laboratory of Science and Technology on Integrated Logistics Support Hunan Changsha410073 China

ISBN: (纸本)9781510682986

Large-scale two-dimensional gratings are typically produced using reactive ion beam scanning etching. However, this method is limited by uneven etching depth, which can negatively impact the performance of large-aperture gratings. To address this issue, we propose optimizing the scanning strategy during reactive etching to improve uniformity. Based on the specific beam distribution, we have established a row spacing calculation model using the convolution algorithm. In the actual reaction etching experiment, we found that a row spacing of only 16 mm resulted in a uniformity within the etching range of 600 mm that was better than 6%. This improvement enhances the diffraction uniformity of the grating. Simulation and experiment were used to verify the influence of row spacing on the uniformity of surface grooves during etching. This method was then used to significantly improve the uniformity of grating etching depth after processing. Therefore, the proposed optimization method of reactive etching scanning strategy has a good industrial application prospect for large-scale two-dimensional grating, wafer etching, and large-scale integrated circuit manufacturing. © 2024 SPIE.

关键词： Reactive ion etching

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Theory and Method of Pulsed Ion Beam Single Crystal Silicon Reshaping Based on Controllable Time-varying Removal Function 7

Theory and Method of Pulsed Ion Beam Single Crystal Silicon ...

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7th Global intelligent Industry Conference, GIIC 2024

作者： Liao, Rongjie Qiao, Tengduo Tian, Ziyao Wang, Yuyang Li, Guanlin Qiao, Dongyang Song, Ci Peng, Xing College of Intelligent Science and Technology National University of Defense Technology Hunan Changsha410073 China Hunan Provincial Key Laboratory of Ultra-Precision Machining Technology Hunan Changsha410073 China Laboratory of Science and Technology on Integrated Logistics Support Hunan Changsha410073 China

ISBN: (纸本)9781510682986

With the continuous improvement of optical performance requirements, weaponry, space observation, laser fusion, extreme ultraviolet lithography, and other fields of optical components of increasing precision requirements, the number of requirements is increasingly large, so the processing of optical components faces serious challenges. Pulsed Ion Beam Shaping is a non-contact optical component machining technology. Pulsed Ion Beam Shaping has the advantages of atomic-level machining accuracy and no edge effect. The ability of pulsed ion beam reshaping mainly depends on factors such as the stability of the removal function, the dynamic performance of the machine's motion axes, and the size of the removal function. At present, due to the difficulty of further improving the dynamic performance of the machine tool, a single beam diameter, and removal efficiency of the removal function for processing, trimming efficiency is not high, and can only be balanced according to the needs of trimming efficiency and accuracy. Thus, we proposed a pulsed ion beam reshaping processing method based on a controlled removal function to achieve the optimal beam diameter selected by the removal function according to the different reshaping face shapes, which improves the reshaping capability of the pulsed ion beam while reducing the additional material removal layer to ensure high processing efficiency. The main research on the shaping method based on the controlled time-varying removal function is carried out, the shaping model based on the controlled time-varying removal function and the residence time solution model are analyzed, the global optimization algorithm based on the error distribution of the surface shape and the removal function library, and the optimal combination of the removal function under the constraints is established, and the theory of the shaping of the controlled time-varying removal function is perfected, and the iterative genetic algorithms, variation and crosso

关键词： Extreme ultraviolet lithography

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Path Tracking Controller Design of Automated Parking Systems via NMPC with an Instructible Solution

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 353-367页

作者： Liang Chen Zhaobo Qin Manjiang Hu Yougang Bian Xiaoyan Peng State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Wuxi Intelligent Control Research Institute of Hunan University Wuxi 214115China

Parking difficulties have become a social issue that people have to *** parking system is practicable for quick par operations without a driver which can also greatly reduces the probability of parking *** paper proposes a Lyapunov-based nonlinear model predictive controller embedding an instructable solution which is generated by the modified rear-wheel feedback method(RF-LNMPC)in order to improve the overall path tracking accuracy in parking ***,A discrete-time RF-LNMPC considering the position and attitude of the parking vehicle is proposed to increase the success rate of automated parking ***,the RF-LNMPC problem with a multi-objective cost function is solved by the Interior-Point Optimization,of which the iterative initial values are described as the instructable solutions calculated by combining modified rear-wheel feedback to improve the performance of local optimal ***,the details on the computation of the terminal constraint and terminal cost for the linear time-varying case is *** closed-loop stability is verified via Lyapunov techniques by considering the terminal constraint and terminal cost ***,the proposed RF-LNMPC is implemented on a selfdriving Lincoln MKZ platform and the experiment results have shown improved performance in parallel and vertical parking *** Monte Carlo analysis also demonstrates good stability and repeatability of the proposed method which can be applied in practical use in the near future.

关键词： Automated parking Path tracking controller Nonlinear model predictive control Monte Carlo analysis

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