检索结果-南通市图书馆

A fault segment location method for distribution networks based on spiking neural P systems and Bayesian estimation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2023年第3期8卷 184-195页

作者： Yi Wang Tao Wang liyuan liu School of Electrical Engineering and Electronic Information Xihua UniversityChengdu 610039China Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China

With the increasing scale of distribution networks and the mass access of distributed generation,traditional central-ized fault location methods can no longer meet the performance requirements of speed and high ***-fore,this paper proposes a fault segment location method based on spiking neural P systems and Bayesian estimation for distribution networks with distributed ***,the distribution network system topology is decoupled into single-branch networks.A spiking neural P system with excitatory and inhibitory synapses is then proposed to model the suspected faulty segment,and its matrix reasoning algorithm is executed to obtain a preliminary set of location ***,the Bayesian estimation and contradiction principle are applied to verify and correct the ini-tial results to obtain the final location *** results based on the IEEE 33-node system validate the feasi-bility and effectiveness of the proposed method.

关键词： Distribution network Fault location Spiking neural P system Bayesian estimation Contradiction principle

Exploration of high-speed 3.0 THz imaging with a 65 nm CMOS process

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Semiconductors 2023年第10期44卷 78-85页

作者： Min liu Ziteng Cai Jian liu Nanjian Wu liyuan liu State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Faculty of Information Technology Beijing University of TechnologyBeijing 100124China

This paper describes a promising route for the exploration and development of 3.0 THz sensing and imaging with FET-based power detectors in a standard 65 nm CMOS *** on the plasma-wave theory proposed by Dyakonov and Shur,we designed high-responsivity and low-noise multiple detectors for monitoring a pulse-mode 3.0 THz quantum cascade laser(QCL).Furthermore,we present a fully integrated high-speed 32×32-pixel 3.0 THz CMOS image sensor(CIS).The full CIS measures 2.81×5.39 mm^(2) and achieves a 423 V/W responsivity(Rv)and a 5.3 nW integral noise equivalent power(NEP)at room *** experiments,we demonstrate a testing speed reaching 319 fps under continuous-wave(CW)illumina-tion of a 3.0 THz *** results indicate that our terahertz CIS has excellent potential in cost-effective and commercial THz imaging and material detection.

关键词： power detectors quantum cascade laser(QCL) CMOS image sensor(CIS) terahertz

Disturbance failure mechanism of highly stressed rock in deep excavation:Current status and prospects

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 611-627页

作者： Tao Wang Weiwei Ye liyuan liu Kai liu Naisheng Jiang Xianhui Feng School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China Department of Engineering Science University of OxfordParks RoadOxford OX13PJUK School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

This article reviews the current status on the dynamic behavior of highly stressed rocks under ***,the experimental apparatus,methods,and theories related to the disturbance dynamics of deep,high-stress rock are reviewed,followed by the introduction of scholars’research on deep rock deformation and failure from an energy ***,with a backdrop of highstress phenomena in deep hard rock,such as rock bursts and core disking,we delve into the current state of research on rock microstructure analysis and residual stresses from the perspective of studying the energy storage mechanisms in ***,the current state of research on the mechanical response and the energy dissipation of highly stressed rock formations is briefly ***,the insufficient aspects in the current research on the disturbance and failure mechanisms in deep,highly stressed rock formations are summarized,and prospects for future research are *** work provides new avenues for the research on the mechanical response and damage-fracture mechanisms of rocks under high-stress conditions.

关键词： deep rock with high stress highly stressed rock rock failure residual stress energy release

A 0.45-to-1.8 GHz synthesized injection-locked bang-bang phase locked loop with fine frequency tuning circuits

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第6期62卷 106-121页

作者： Jincheng YANG Zhao ZHANG Nan QI liyuan liu Jian liu Nanjian WU State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences University of Chinese Academy of Sciences

This paper proposes a synthesized injection-locked bang-bang phased-locked loop（SILBBPLL）with high digital controlled oscillator（DCO） frequency resolution. The SILBBPLL is expressed with hardware description language and automatically placed & routed（APR） by using standard digital circuit design flow. As the mismatch issues of the circuits are not considered carefully during the APR design flow, the phase noise performance is severely deteriorated. We adopt pulse injection locking technique to improve the phase noise performance. The DCO frequency resolution is critical for reducing the reference spur in a digital injection-locked PLL. Therefore, we propose novel frequency tuning circuits to increase the DCO frequency resolution so that the reference spurs are reduced. The frequency tuning circuits consist of a standard cell based high-linearity output feedback DAC（OFDAC） and two custom varactors. The OFDAC is used to tune the frequency of the DCO with the custom varactor precisely. The custom varactor is firstly designed,added into the standard cell library, and APR with the standard cells. The SILBBPLL chip with a core area of 0.008 mm;is implemented in 65 nm CMOS process. When operating at 1.8 GHz, the measured results show that the root-mean-square（RMS） jitter integrated from 10 kH z to 100 MHz is 1.1 ps, and the power consumption is 1.5 mW with a 0.8-V supply. The proposed SILBBPLL achieves a figure-of-merit（FoM） of -237.4 dB and a reference spur of -50.9 dBc.

关键词： synthesized all-digital phased-locked loops(ADPLL) bang-bang phased-locked loop(BBPLL) automatically placed & routed(APR) output feedback DAC(OFDAC) injection-locked

Residual stress measurement and analysis of siliceous slate-containing quartz veins

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第12期30卷 2310-2320页

作者： Tao Wang Weiwei Ye Yemeng Tong Naisheng Jiang liyuan liu School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

Engineering geological disasters such as rockburst have always been a critical factor affecting the safety of coal mine ***,residual stress is considered a feasible method to explain these geomechanical *** this study,electron backscatter diffraction(EBSD)and optical microscopy were used to characterize the rock microcosm.A measuring area that met the requirements of X-ray diffraction(XRD)residual stress measurement was determined to account for the mechanism of rock residual ***,the residual stress of a siliceous slate-containing quartz vein was measured and calculated using the sin^(2) ϕ method equipped with an X-ray *** of microscopic test results showed homogeneous areas with small particles within the millimeter range,meeting the requirements of XRD stress measurement *** was determined as the calibration mineral for slate samples containing quartz *** diffraction patterns of the(324)crystal plane were obtained under different ϕ and φ.The deviation direction of the diffraction peaks was consistent,indicating that the sample tested had residual *** addition,the principal residual stress within the quartz vein measured by XRD was compressive,ranging from 10 to 33 *** maximum principal stress was parallel to the vein trend,whereas the minimum principal stress was perpendicular to the vein ***,the content of the low-angle boundary and twin boundary in the quartz veins was relatively high,which enhances the resistance of the rock mass to deformation and promotes the easy formation of strain concentrations,thereby resulting in residual *** proposed method for measuring residual stress can serve as a reference for subsequent observation and related research on residual stress in different types of rocks.

关键词： residual stress siliceous sand rock microstructure X-ray diffraction electron backscatter diffraction

Software System Evolution Analysis Method Based on Algebraic Topology

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2018年第5期23卷 599-609页

作者： Chun Shan liyuan liu Jingfeng Xue Changzhen Hu Hongjin Zhu School of Software Beijing Institute of Technology Beijing 100081 China

The analysis of software system evolution is highly significant in software research as the evolution runs throughout the lifecycle of a software system. Considering a software system as an algebraic engineering system, we propose a software system evolution analysis method based on algebraic topology. First, from a complex network perspective, we abstract a software system into the software structural topology diagram. Then, based on the algebraic topology principle, we abstract each node in the software structural topology diagram into an algebraic component represented by a 6-tuple. We propose three kinds of operation relationships between two algebraic components, so that the software system can be abstracted into an algebraic expression of components. In addition, we propose three forms of software system evolution, which help to analyze the structure and evolution of system software and facilitate its maintenance and reconfiguration.

关键词： software structural topology diagram algebraic component topological complex evolution

High-speed visual target tracking with mixed rotation invariant description and skipping searching

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2017年第6期60卷 225-236页

作者： Yongxing YANG Jie YANG Zhongxing ZHANG liyuan liu Nanjian WU State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences Department of Electrical and Computer Engineering University of Calgary

This paper proposes a novel high-speed visual target tracking system based on mixed rotation invariant description(MRID) and skipping searching method. MRID is a novel rotation invariant description of texture and edge information by annular histograms and dominant direction. It overcomes rotation variant and large computation issues in conventional LBP-HOG feature description. The skipping searching method used in tracking can remarkably decrease the computation time by avoiding repeated searching *** proposed tracking system contains an image sensor, a hierarchical vision processor and an actuator with2 dimensions of freedom(DOF). The vision processor integrates processors with pixel-and row-level parallelism to speed up the tracking algorithm. Experiment results show that the proposed system can achieve over 1000-fps processing speed of the tracking algorithm under 750 × 480 resolution image.

关键词： target tracking parallel vision processor MRID skipping searching image processing

High-speed target tracking system based on multi-interconnection heterogeneous processor and multi-descriptor algorithm

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第6期62卷 168-170页

作者： Jiaqing WANG Yongxing YANG liyuan liu Nanjian WU State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences University of Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of Sciences

Dear editor,Target tracking has been a subject of intense scholarly research in past decades. Many parallel processors [1–4] and efficient tracking algorithms based on feature extraction [3–5] have been proposed to meet the requirements of high-speed tracking. However, the tracking algorithms are all based on a single descriptor so that the description for the target is not comprehensive and the

关键词： LBP RP MPU PE HOG High-speed target tracking system based on multi-interconnection heterogeneous processor and multi-descriptor algorithm

Deterministic conversion rule for CNNs to efficient spiking convolutional neural networks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第2期63卷 196-214页

作者： Xu YANG Zhongxing ZHANG Wenping ZHU Shuangming YU liyuan liu Nanjian WU State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of Sciences

This paper proposes a general conversion theory to reveal the relations between convolutional neural network(CNN) and spiking convolutional neural network(spiking CNN) from structure to information processing. Based on the conversion theory and the statistical features of the activations distribution in CNN,we establish a deterministic conversion rule to convert CNNs into spiking CNNs with definite conversion procedure and the optimal setting of all parameters. Included in conversion rule, we propose a novel "nscaling" weight mapping method to realize high-accuracy, low-latency and power efficient object classification on hardware. For the first time, the minimum dynamic range of spiking neuron’s membrane potential is studied to help to balance the trade-off between representation range and precise of the data type adopted by dedicated hardware when spiking CNNs run on it. The simulation results demonstrate that the converted spiking CNNs perform well on MNIST, SVHN and CIFAR-10 datasets. The accuracy loss over three datasets is no more than 0.4%. 39% of processing time is shortened at best, and less power consumption is benefited from lower latency achieved by our conversion rule. Furthermore, the results of noise robustness experiments indicate that spiking CNN inherits the robustness from its corresponding CNN.

关键词： convolutional neural networks(CNN) spiking neural networks(SNN) image classification conversion rule noise robustness neuromorphic hardware