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Editorial for the Special Issue on Unmanned Intelligent Cluster

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engineering 2022年第5期8卷 1-2页

作者： jun zhang Toshio Fukuda Defu Lin Florian Holzapfel school of information and electronics Beijing Institute of TechnologyBeijing 100081China school of Mechatronical engineering Beijing Institute of TechnologyBeijing 100081China school of Aerospace engineering Beijing Institute of TechnologyBeijing 100081China Institute of Flight System Dynamics Technical University of MunichGarching 85748Germany

Recent advances in networked cooperative autonomous sys-tems offer the potential to significantly improve system quality for a wide range of *** in embedded processor,sensor,communication,and networking technology in the last few decades has accelerated interest in networked cooperative autonomous systems,multirobot systems,and distributed sensor networks for applications such as manufacturing,logistics,pro-cess monitoring,enhanced situational awareness,plant safety,inspection,security,and rescue operations.

关键词： robot networks autonomous

Valleytronics in transition metal dichalcogenides materials

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Nano Research 2019年第11期12卷 2695-2711页

作者： Yanping Liu Yuanji Gao Siyu zhang jun He Juan Yu Zongwen Liu school of Plhysics and Elecrorics Hunan Key Laboratory for Super microstr ucture and Utrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China State Key Laboralory of High Performance Complex Manufacturing Central South University932 South Lushan RoadChangsha 410083China school of electronics and information Hangzhou Dianzi Unriversity1158 Second StreetXiasha College ParkHangzhou 310018China school of Chemical and Biomolecular engineering The University of SydneyNSW 2006Australia

Valley degree of freedom in the first Brillouin zone of Bloch electrons offers an innovative approach to information storage and quantum *** inversion symmetry together with the presence of time-reversal symmetry endows Bloch electrons non-zero Berry curvature and orbital magnetic moment,which contribute to the valley Hall effect and optical selection rules in ***,the emerging transition metal dichalcogenides(TMDs)materials naturally become the ideal candidates for valleytronics research attributable to their novel structural,photonic and electronic properties,especially the direct bandgap and broken inversion symmetry in the ***,the mechanism of inter-valley relaxation remains ambiguous and the complicated manipulation of valley predominantly incumbers the realization of valleytronic *** this review,we systematically demonstrate the fundamental properties and tuning strategies(optical,electrical,magnetic and mechanical tuning)of valley degree of freedom,summarize the recent progress of TMD-based valleytronic *** also highlight the conclusion of present challenges as well as the perspective on the further investigations in valleytronics.

关键词： valleytronics valley excitons transition metal dichalogenides(TMDs) valley Hall effect quantum devices

Feedback Learning Based Dead Write Termination for Energy Efficient STT-RAM Caches

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Chinese Journal of electronics 2017年第3期26卷 460-467页

作者： SHEN Fanfan HE Yanxiang zhang jun JIANG Nan LI Qing'an LI Jianhua Computer school Wuhan University State Key Laboratory of Software engineering Wuhan University school of Computer and information Hefei University of Technology

Spin-torque transfer RAM(STT-RAM) is a promising candidate to replace SRAM for larger Last level cache(LLC). However, it has long write latency and high write energy which diminish the benefit of adopting STT-RAM caches. A common observation for LLC is that a large number of cache blocks have never been referenced again before they are evicted. The write operations for these blocks, which we call dead writes, can be eliminated without incurring subsequent cache misses. To address this issue, a quantitative scheme called Feedback learning based dead write termination(FLDWT) is proposed to improve energy efficiency and performance of STT-RAM based LLC. FLDWT dynamically learns the block access behavior by using data reuse distance and data access frequency, and then classifies the blocks into dead blocks and live blocks. FLDWT terminates dead write block requests and improves the estimation accuracy via feedback information. Compared with STT-RAM baseline in the lastlevel caches, experimental results show that our scheme achieves energy reduction by 44.6% and performance improvement by 12% on average with negligible overhead.

关键词： Dead blocks Energy efficiency Spintransfer torque RAM(STT-RAM) Last level cache(LLC)

Multiple Routes Recommendation System on Massive Taxi Trajectories

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Tsinghua Science and Technology 2016年第5期21卷 510-520页

作者： Yaobin He Fan zhang Ye Li jun Huang Ling Yin Chengzhong Xu Harbin Institute of Technology Shenzhen Graduate School and the Smart City Research Institute of China Electronics Technology Group Corporation Shenzhen 518000 China. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518000 China

This paper presents a cloud-based multiple-route recommendation system, xGo, that enables smartphone users to choose suitable routes based on knowledge discovered in real taxi trajectories. In modern cities, GPS-equipped taxicabs report their locations regularly, which generates a huge volume of trajectory data every day. The optimized routes can be learned by mining these massive repositories of spatio-temporal information. We propose a system that can store and manage GPS log files in a cloud-based platform, probe traffic conditions, take advantage of taxi driver route-selection intelligence, and recommend an optimal path or multiple candidates to meet customized requirements. Specifically, we leverage a Hadoop-based distributed route clustering algorithm to distinguish different routes and predict traffic conditions through the latent traffic rhythm. We evaluate our system using a real-world dataset（〉100 GB） generated by about 20 000 taxis over a 2-month period in Shenzhen, china. Our experiments reveal that our service can provide appropriate routes in real time and estimate traffic conditions accurately.

关键词： route recommendation route clustering traffic prediction cloud computing

Lateral Flight Technical Error Estimation Model for Performance Based Navigation

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Chinese Journal of aeronautics 2011年第3期24卷 329-336页

作者： ZHAO Hongsheng XU Xiaohao zhang jun ZHU Yanbo YANG Chuansen HONG Sheng school of electronics and information {3. Beihang University Beijing 100191 China College of Air Traffic Management Civil Aviation University of China Tianjin 300300 China College of Civil Aviation Nanjing University of Aeronautics and Astronautics Nanjing 210016 China school of Reliability and System engineering Beihang University Beijing 100191 China

Flight technical error （FTE） combined with navigation system error （NSE） is the main part of total system error （TSE） in performance based navigation （PBN）. The implementation of PBN requires pre-flight prediction and en-route short-term dynamical prediction of the TSE. Once the sum of predicted lateral FTE and NSE is greater than the specified PBN value, the PBN cannot operate. Thus, accurate modeling and thorough analysis of lateral FTE are indispensible. Multiple-input multiple-output （MIMO） lateral track control system of a transport aircraft is designed using linear quadratic Gaussian and loop transfer recovery （LQG/LTR） method, and the lateral FTE of a turbulence disturbed approach operation is analyzed. The error estimation mapping function of latera FTE and its bound estimation algorithm are proposed based on singular value theory. According to the forming mechanism of lateral FTE, the algorithm considers environmental turbulence fluctuation disturbance, aircraft dynamics and con- trol system parameters. Real-data-based Monte-Carlo simulation validates the theoretical analysis of FTE. It also shows that FTE is mainly caused by turbulence fluctuation disturbance when automatic flight control system （AFCS） is engaged and would in- crease with escalating environmental turbulence intensity.

关键词： flight technical error performance based navigation LQG/LTR air traffic management Kahnan filters

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基于多残差和多重特征融合的去雾算法

国外电子测量技术 2024年第6期43卷 12-21页

作者：武丽俞俊张征浩葛彩成无锡学院电子信息工程学院无锡214000 南京信息工程大学电子与信息工程学院南京210000

针对目前大多数图像去雾算法由于细节丢失导致去雾后的图像颜色失真,雾霾残留以及纹理细节模糊等问题,提出一种基于多残差和多重特征融合端到端的去雾算法。首先通过设计浅层特征提取模块,为深层网络提高丰富信息的特征图;其次设计多残... 详细信息

针对目前大多数图像去雾算法由于细节丢失导致去雾后的图像颜色失真,雾霾残留以及纹理细节模糊等问题,提出一种基于多残差和多重特征融合端到端的去雾算法。首先通过设计浅层特征提取模块,为深层网络提高丰富信息的特征图;其次设计多残差级联模块,提取多层次特征,帮助模型学习更加复杂的特征表示;然后设计局部-全局特征融合模块,捕获从最细微到最广泛的特征;最后设计结合残差注意力的跨层特征融合模块,避免上下采样后的细节缺失,更好地提取图像中的局部与全局信息特征。实验结果表明,所提算法在SOTS室内、室外测试集上峰值信噪比(PSNR)分别取得了3..12、3..07dB,结构相似性(SSIM)分别取得0.986、0.983.与当前大多数主流算法相比得到了明显的提升,且在合成雾图像和真实雾霾图像均取得了不错的去雾效果,复原图像细节更加清晰,更符合人类视觉感知。

关键词：图像去雾深度学习编解码器残差结构特征融合

A supersaturated Cu-Ag nanoalloy joint with ultrahigh shear strength and ultrafine nanoprecipitates for power electronic packaging

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Journal of Materials Science & Technology 2023年第14期145卷 56-65页

作者： Wenwu zhang Penghao zhang Dashi Lu Hao Pan Xiangli Liu Chengyan Xu jun Wei Mingyu Li Hongjun Ji The State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology at ShenzhenShenzhen 518055China Sauvage Laboratory for Smart Materials School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China Shenzhen Key Laboratory of Flexible Printed electronics Technology Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Ag-Cu bimetallic nanoalloy,integrating the advantages of reducing migration and cost of nano-Ag and alleviating oxidation of nano-Cu,is a prospective bonding material for power electronic *** Ag-coated Cu nanoparticles(Cu@Ag NPs)paste can execute bonding with high quality at 250℃,and the achieved supersaturated Ag-Cu nanoalloy joint with ultrahigh shear strength(152 MPa)dramatically exceeds most nano-paste *** interstitial solid solutions with atomic-level metallurgical bonds at the interface dominantly promoted the shear ***,the numerous ultrafine nanograin,high proportion of low angle grain boundaries(7.44%)without deformation,and the Cu nanoprecipitates in the joint would improve ***,the high content(16.8%)of∑3.twin boundaries would contribute to the electrical and thermal ***,the multiple strengthening mechanisms with the solid solution,the second precipitated phase,and ultrafine nanograin can dramatically enhance shear strength and electro-thermal conductivity of joints for high-temperature device packaging.

关键词： Supersaturated Ag-Cu solid solution Cu nanoparticle precipitates Ultrafine nanograin Strengthening mechanism Electronic packaging

Nonreciprocity of energy transfer in a nonlinear asymmetric oscillator system with various vibration states

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Applied Mathematics and Mechanics(English Edition) 2023年第5期44卷 727-744页

作者： Jian’en CHEN Jianling LI Minghui YAO jun LIU Jianhua zhang Min SUN Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical engineering Education Tianjin University of TechnologyTianjin 300384China school of aeronautics and astronautics Tiangong UniversityTianjin 300387China Agricultural information Institute of Chinese Academy of Agricultural Sciences Key Laboratory of Agricultural Big DataMinistry of Agriculture and Rural AffairsBeijing 100081China school of Science Tianjin Chengjian UniversityTianjin 300384China

The nonreciprocity of energy transfer is constructed in a nonlinear asymmetric oscillator system that comprises two nonlinear oscillators with different parameters placed between two identical linear *** slow-flow equation of the system is derived by the complexification-averaging *** semi-analytical solutions to this equation are obtained by the least squares method,which are compared with the numerical solutions obtained by the Runge-Kutta *** distribution of the average energy in the system is studied under periodic and chaotic vibration states,and the energy transfer along two opposite directions is *** effect of the excitation amplitude on the nonreciprocity of the system producing the periodic responses is analyzed,where a three-stage energy transfer phenomenon is *** the first stage,the energy transfer along the two opposite directions is approximately equal,whereas in the second stage,the asymmetric energy transfer is *** energy transfer is also asymmetric in the third stage,but the direction is reversed compared with the second ***,the excitation amplitude for exciting the bifurcation also shows an asymmetric *** vibrations are generated around the resonant frequency,irrespective of which linear oscillator is *** excitation threshold of these chaotic vibrations is dependent on the linear oscillator that is being *** addition,the difference between the energy transfer in the two opposite directions is used to further analyze the nonreciprocity in the *** results show that the nonreciprocity significantly depends on the excitation frequency and the excitation amplitude.

关键词： nonreciprocity strong nonlinearity energy transfer chaotic vibration higher branch of response

Propagation of shaped beam through uniaxially anisotropic chiral slab

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Chinese Physics B 2020年第11期29卷 380-385页

作者： Ming-jun Wang Jia-Lin zhang Hua-Yong zhang Zi-Han Wang school of Automation and information engineering Xi’an University of TechnologyXi’an 710048China school of electronics and information {3. Anhui UniversityHefei 230039China school of Chemistry and Chemical engineering Anhui UniversityHefei 230039China school of Physics and Telecommunications engineering Shaanxi University of TechnologyHanzhong 723001China

A general solution is obtained to a canonical problem of the reflection and refraction of an arbitrary shaped beam by using a uniaxially anisotropic chiral *** reflected,internal as well as refracted shaped beams are expanded in terms of cylindrical vector wave functions,and the expansion coefficients are determined by using the boundary conditions and method of moments *** two typical examples,the normalized field intensity distributions are evaluated for a fundamental Gaussian beam and Hermite-Gaussian beam,and some propagation properties,especially the negative refraction phenomenon,are discussed briefly.

关键词： shaped beam uniaxially anisotropic chiral slab reflection and refraction negative refraction phenomenon