检索结果-内蒙古大学图书馆

3D lidar scene projector (LSP) for the performance testing of large-array flash lidar systems for autonomous vehicles

引用

Optics and Laser technology 2025年 188卷

作者： Li, Renjie Gao, Yanze Pan, Hongcheng An, Tongtong Li, Zhuo Yuan, Xujin School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Yangtze Delta Region Academy Beijing Institute of Technology Jiaxing314019 China National Key Laboratory on Near-surface Detection Beijing100072 China Institute of Advanced Structure Technology Beijing Institute of Technology Beijing100081 China

Flash lidars utilize array-type detectors to rapidly capture detailed 3D point clouds without scanning, making them crucial for automotive sensing. This paper presents a 3D lidar scene projector (LSP) designed to assess the performance of large-array flash lidar systems. The LSP improves the lidar testing efficiency: it reduces testing time from over 2 days to about 30 min (a 99 % acceleration) and reduces spatial footprint requirements from 500 m2 to 4 m2 (a 99 % reduction). Initially, using time-domain tomography, we break down the 3D point cloud of a lidar scene into 2D time slices. Subsequently, a spatial light modulator (SLM) is utilized to create optical patterns that represent these time slices. These patterns are then superimposed and imaged using integrated imaging to construct a 3D image. The LSP achieves a spatial resolution of 640 × 512 pixels, a distance simulation range of 0.5 ∼ 50 m, a distance simulation resolution of 15 mm, 12 depth levels, a depth of field (DOF) of 180 mm, a field of view (FOV) of 64°×53°, and a maximum frame rate of 10.6 kHz. Our 3D LSP eliminates reliance on manual adjustments reflectivity boards, and has been deployed as a terminal testing instrument on a lidar mass production line. The LSP's exceptional testing efficiency demonstrates its potential to advance intelligent vehicle technology. © 2025 Elsevier Ltd

关键词： Instrument testing

来源：评论

学校读者我要写书评

暂无评论

Candidate Evaluation with Multimodal Data-Driven for Recruitment 27th

Candidate Evaluation with Multimodal Data-Driven for Recru...

引用

27th International Conference on Pattern Recognition, ICPR 2024

作者： Wu, Xing Liu, Kehong Wang, Jianjia Yao, Junfeng Deng, Bin Lv, Rongqi Song, Jun School of Computer Engineering and Science Shanghai University Shanghai200444 China Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai200444 China School of AI and Advanced Computing XJTLU Entrepreneur College Xi’an Jiaotong-Liverpool University Suzhou215412 China CSSC Seago System Technology Co. Ltd. Shanghai200010 China Science and Technology on Near-Surface Detection Laboratory Jangsu Wuxi214035 China Department of Geography Hong Kong Baptist University 999077 Hong Kong

ISBN: (纸本)9783031781858

In the field of intelligent recruitment, automated resume matching and non-contact interviews have significantly improved the efficiency of companies in finding suitable candidates. This corresponds to the techniques of person-job matching and AI interviews. However, current person-job matching methods lack substantial data support, while AI interview methods struggle to integrate deep information from multimodal data and provide comprehensive evaluations of candidates’ responses. To address these challenges, we propose a multimodal data-driven person-job evaluation model, comprising two key stages: a person-job matching method based on graph attention and a multimodal AI interview method. Using a dual-perspective graph neural network approach, we accomplish the screening of candidates and positions. In the second stage, we conduct a comprehensive evaluation of candidates’ interview performance based on text, audio, and image modalities, providing a more objective, consistent, and efficient interview assessment method. Experimental results demonstrate that our person-job matching method surpasses current popular techniques and effectively transfers features to the next stage. In our multimodal AI interview method, we achieve accurate scoring of candidate responses, assessment of intonation stress levels, and inference of their Big Five personality traits, comprehensively evaluating candidates from multiple perspectives. This confirms the superiority and efficiency of our approach. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Graph neural networks

来源：评论

学校读者我要写书评

暂无评论

Solvent Evaporation-Induced Self-Assembly of Flexible Cholesteric Liquid Crystal Elastomers: Fabrication, Performance Tuning, and Optimization

引用

Materials 2025年第9期18卷 1927-1927页

作者： Zhang, Jinying Zhang, Yexiaotong Gao, Zhongwei Yang, Jiaxing Wang, Xinye Beijing Key Lab for Precision Optoelectronic Measurement Instrument and Technology School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Yangtze Delta Region Academy Beijing Institute of Technology Jiaxing314001 China National Key Laboratory on Near-Surface Detection Beijing100081 China

The realization of broad-wavelength tunability of the structural color in Double layered Cholesteric Liquid Crystal Elastomers (DCLCEs), along with good flexibility and processability, presents a significant challenge. This research introduces a facile and effective fabrication technique, Solvent Evaporation-Induced Self-Assembly (SEISA), for the production of DCLCEs exhibiting broad wavelength tunability, superior flexibility, and robust mechanical characteristics. Focusing on initial color tuning, bubble defect minimization, UV photopolymerization, and coating procedures, this research systematically optimizes the fabrication process through experimental investigation of factors like chiral dopant amount, temperature, UV exposure duration, coating thickness, and speed. The method enabled the successful fabrication of DCLCEs with uniform and controllable coloration, demonstrating the effectiveness of this controlled synthesis approach in significantly enhancing structural color features. Upon stretching to 2.8 times its original length, the center wavelength shifted from 613 nm to 404 nm, yielding a tunable bandwidth of up to 209 nm across the visible spectrum. © 2025 by the authors.

关键词： Cholesteric liquid crystals

来源：评论

学校读者我要写书评

暂无评论

Bending-switchable terahertz metamaterial with a single layer based on laser-induced graphene

引用

Chinese Optics Letters 2025年第4期23卷 043603-043603页

作者： Jalal, Abdul Dong, Yan Deng, Bowen Qasim, Muhammad Moghaddasi, Mojtaba Qureshi, Ubaid Ur Rahman Wang, Zongyuan Wu, Xudong Xiong, Chenjie Hu, Bin National Key Laboratory on Near-surface Detection Beijing100072 China School of Optics and Photonics Beijing Institute of Technology Beijing100081 China

We propose a fast-printable and function-switchable metamaterial based on laser-induced graphene for terahertz (THz) wave modulation in the reflection mode. The design can modulate the linear polarization of the incoming wave fronts to its cross-polarization from 0.27 to 0.41 THz and linear polarization to circular polarization from 0.48 to 0.62 THz. The function of the device can also be switched from a polarization converter to an absorber by bending it with an angle of 57°. Experimental results showed a good agreement with those of the simulation. The proposed polarization converter may find its application in THz polarization control systems and sensing. © 2025 Chinese Optics Letters.

关键词： Wavefronts

来源：评论

学校读者我要写书评

暂无评论

High-power 70 fs Yb:KGW oscillator with enhanced intracavity kerr-effect nonlinearity

引用

Optics and Laser technology 2025年 190卷

作者： Wang, Ruiqi Yang, Fan Wang, Qing Liang, Qiuyu Gao, Mingwei Zhang, Jinwei School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China National Key Laboratory on Near-Surface Detection Beijing 100072 China Key Laboratory of Photonics Information Technology Ministry of Industry and Information Technology Beijing 100081 China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Hubei Wuhan 430074 China

We demonstrated a high-power, diode-pumped Yb:KGW Kerr-lens mode-locked laser featuring an intracavity Kerr-mirror configuration. The resonator is terminated with a coated YAG crystal serving as the nonlinear Kerr-mirror, which significantly enhances self-phase modulation. This configuration enables the generation of 80.5-fs pulses at 5.72 W output power at the central wavelength of ∼1030 nm, with further Kerr-effect nonlinearity optimization yielding 70.3-fs pulses at 5.06 W output power and a maximum broadening spectral width of up to 20.5 nm. Notably, this represents the first Yb:KGW Kerr-lens mode locked oscillator to exceed 5 W of output power while sustaining sub-100 fs pulse durations. This proposed Kerr-mirror-mediated approach establishes a new regime in ultrafast oscillator design, enabling the enhancement of power-scaling to multi-watt levels while delivering pulses of reduced duration. © 2025

关键词： Femtosecond laser Kerr-lens mode locking Self-phase modulation Yb:KGW

来源：评论

学校读者我要写书评

暂无评论

Root inspired in situ interlocked interface for strength and ductility combination of refractory high-entropy alloys/Ni composites by activated sintering

引用

Materials science and Engineering: A 2025年 939卷

作者： Yang, Xiao Yang, De Huang, Hai Wang, Shubang Zhang, Zehai Liang, Zhimin Wang, Liwei Peng, Zhenzhen Liu, Ying Wang, Dianlong Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang050018 China School of Materials Science and Engineering East China Jiaotong University Nanchang330013 China Key Laboratory of Superlight Material and Surface Technology Ministy of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China

This work proposed a simple bionic-inspired strategy to in situ construct a root-like interfacial interlocked structure in the refractory high-entropy alloys (RHEA) particle-reinforced Ni matrix composites by activated sintering. The results showed that at the RHEA-Ni interface, Ni element preferred to aggregate inside the RHEA near the interface by grain boundaries (GBs) wetting and far away from the interface by GBs prewetting. Subsequently, the Ni-rich liquid-like film crystallized into Ni3(Ta, Nb), Ni2(Ta, Nb) phases due to relatively low Gibbs free energy change (ΔG) and high diffusion rate, in situ forming root-like interlocked structure anchored on the RHEA particle. At the root-like interlocked interface, the Ni-Ta intermetallic compounds (IMCs) and BCC phase, serving as alternating hard and soft oriented phases, enhance the interlocked interface hardness and elastic modulus. The finite element method proved that the root-like interlocked structure reduced the demand for interfacial reaction layer strength and the degree of interfacial stress concentration. Compared to the pure Ni bulk, the 10 vol% RHEA/Ni composite obtains 41.8 % and 93.4 % in ultimate tensile strength (UTS) to 509 MPa and yield strength (YS) to 205 MPa, respectively, while maintaining an acceptable elongation of 15.8 %. This work offers a novel approach to in situ synthesize the bionic configuration interface structure for the enhanced interfacial bonding and optimized interfacial stress distribution of the Ni matrix composites. © 2025 Elsevier B.V.

关键词： Tensile strength

来源：评论

学校读者我要写书评

暂无评论

Sound event localization and detection based on deep learning

引用

Journal of Systems Engineering and Electronics 2024年第2期35卷 294-301页

作者： ZHAO Dada DING Kai QI Xiaogang CHEN Yu FENG Hailin School of Mathematics and Statistics Xidian UniversityXi’an 710071China Science and Technology on Near-Surface Detection Laboratory Wuxi 214035China

Acoustic source localization(ASL)and sound event detection(SED)are two widely pursued independent research *** recent years,in order to achieve a more complete spatial and temporal representation of sound field,sound event localization and detection(SELD)has become a very active research *** paper presents a deep learning-based multioverlapping sound event localization and detection algorithm in three-dimensional ***-Mel spectrum and generalized cross-correlation spectrum are joined together in channel dimension as input *** features are classified and regressed in parallel after training by a neural network to obtain sound recognition and localization results *** channel attention mechanism is also introduced in the network to selectively enhance the features containing essential information and suppress the useless ***,a thourough comparison confirms the efficiency and effectiveness of the proposed SELD *** experiments show that the proposed algorithm is robust to reverberation and environment and can achieve higher recognition and localization accuracy compared with the baseline method.

关键词： sound event localization and detection(SELD) deep learning convolutional recursive neural network(CRNN) channel attention mechanism

来源：评论

学校读者我要写书评

暂无评论

A novel variable structure multi-model approach based on error-ambiguity decomposition

引用

Chinese Journal of Aeronautics 2020年第6期33卷 1731-1746页

作者： Han SHEN-TU Yingjiao RONG Dongliang PENG Mengfan XUE Yunfei GUO Institution of Information and Control Hangzhou Dianzi UniversityHangzhou 310018China Science and Technology on Near-Surface Detection Laboratory Wuxi 214035China

Model Set Adaptation(MSA)plays a key role in the Variable Structure Multi-Model tracking approach(VSMM).In this paper,the Error-Ambiguity Decomposition(EAD)principle is adopted to derive the EAD-MSA criterion that is optimal in the sense of minimizing the square error between the estimate and the ***,the EAD Variable Structure first-order General Pseudo Bayesian(EAD-VSGPB1)algorithm and the EAD Variable Structure Interacting Multiple Model(EAD-VSIMM)algorithm are *** proposed algorithms are tested in two groups of maneuvering target tracking scenarios under different modes and observation error *** simulation results demonstrate the effectiveness of the EAD-VSMM approach and show that,compared to some existing multi-model algorithms,the proposed EAD-VSMM algorithms achieve more robust and accurate tracking results.

关键词： Error-ambiguity decomposition Maneuvering target tracking Model sequence set adaptation Multi-model estimation Variable structure

来源：评论

学校读者我要写书评

暂无评论

Maglev self-excited vibration suppression with a virtual sky-hooked damper

引用

Journal of Central South University 2016年第6期23卷 1363-1371页

作者：李金辉李杰周丹峰王连春 College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China Science and Technology on Near-surface Detection Laboratory Wuxi 214035 China

This work addresses the problem of self-excited vibration,which degrades the stability of the levitation control,decreases the ride comfort,and restricts the construction cost of maglev ***,a minimum model containing a flexible bridge and a single levitation unit is *** on the simplified model,the principle underlying the self-excited vibration is *** investigations about the energy transmission between the levitation system and bridge,it is concluded that the increment of modal damping can dissipate the accumulated energy by the bridge and the self-excited vibration may be *** enlarge the equivalent modal damping of bridge,the sky-hooked damper is ***,to avoid the hardware addition of real sky-hooked damper,considering the fact that the electromagnet itself is an excellent actuator that is capable of providing sufficiently fast and large force acting on the bridge to emulate the influence of the real sky-hooked damper,the technique of the virtual sky-hooked damper is *** principle underlying the virtual sky-hooked damper by electromagnet is explored and the vertical velocity of bridge is ***,numerical and experimental results illustrating the stability improvement of the vehicle-bridge interaction system are provided.

关键词： maglev vehicle-bridge interaction system self-excited vibration sky-hooked damper

来源：评论

学校读者我要写书评

暂无评论

Stacking, Strain-Engineering Induced Altermagnetism, Multipiezo Effect, and Topological State in Two-Dimensional Materials

arXiv

引用

arXiv 2025年

作者： Xun, Wei Liu, Xin Zhang, Youdong Wu, Yin-Zhong Li, Ping Jiangsu Engineering Research Center for Design and Application of Intelligent Detection Equipment School of Electronic Engineering Jiangsu Vocational College of Electronics and Information Huaian223003 China School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China State Key Laboratory for Mechanical Behavior of Materials Center for Spintronics and Quantum System School of Materials Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory for Surface Physics Department of Physics Fudan University Shanghai200433 China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou310027 China

Altermagnetism, as a newly identified form of unconventional antiferromagnetism, enables the removal of spin degeneracy in the absence of net magnetization that provides a platform for the low power consumption and ultra-fast device applications. However, the rare attention has been paid to the relationship between stacking, strain and altermagnet, multipiezo effect and topological state. Here, we propose a mechanism to realize the altermagnet, multipiezo effect, and topological state in two-dimensional materials by the stacking and strain engineering. Based on the analysis of symmetry, we find that the spin splitting feature related to the Ut, PTt, MzUt, or MzPTt symmetries in altermagnet multilayers. In addition, we find that the stacking engineering can effectively realize the transform from antiferromagnetism to altermagnetism and semiconductor to metal for the Jauns bilayer V2SeTeO. More interestingly, the strain not only induces an intriguing multipiezo effect, encompassing the piezovalley, piezomagnetism and piezoelectric, but also achieves the abundant topological phase. Our findings offer a generalized direction for manipulating the spin splitting, valley polarization, and topological states, promoting practical application of valleytronic and spintronic devices based on two-dimensional altermagnets. © 2025, CC BY.

关键词： Antiferromagnetism

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：