检索结果-南通市图书馆

基于DMD的阿达玛变换型近红外光谱仪快速处理系统设计与实现

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2025年第1期45卷 133-138页

作者：王硕谢振坤魏志鹏长春理工大学高功率半导体激光国家重点实验室吉林长春130022 长春理工大学中山研究院广东中山528437

数字微镜器件(DMD)的近红外光谱仪,具有波长重复性好、分辨率高和抗振动性好等优点,广泛应用于食品安全和农业生产等领域的研究。随着DMD的微小型近红外光谱仪发展逐渐趋于成熟,仪器的成本和性能仍然是研发的关键。尽管大部分将重点放... 详细信息

数字微镜器件(DMD)的近红外光谱仪,具有波长重复性好、分辨率高和抗振动性好等优点,广泛应用于食品安全和农业生产等领域的研究。随着DMD的微小型近红外光谱仪发展逐渐趋于成熟,仪器的成本和性能仍然是研发的关键。尽管大部分将重点放在了软件开发和检测方法的研究,而仪器硬件的处理速度至关重要。只有确保光谱仪能够快速准确的采集并传输数据,才能有效实现光谱分析。在多数研究中,阿达玛矩阵的生成和解码工作通常由上位机完成,并通过FLASH存储的方式导入模板。这种方式可能会限制采集一幅完整光谱数据的时间效率。为了提高光谱采集速度和信噪比,提出一种高速驱动DMD和快速数据采集的方法,并基于DMD微小型近红外光谱仪设计一套硬件电路系统。采用现场可编辑门阵列(FPGA)和ARM的架构,创新性地实现了奇偶阿达玛模板的生成与解码过程在嵌入式系统底层执行,加快了光谱分析的速度并提高信噪比。通过与市面上DMD型光谱仪对比,研究结果显示,所研发的光谱仪完成单次光谱的采集时间仅需214 ms,相比商用DMD型光谱仪,采集效率提升了4倍。在同等3 s的采集时间内,所研发光谱仪的信噪比为4600,相比商用DMD型光谱仪,信噪比提升了1.5倍。通过所研发的光谱仪对油菜籽样品进行光谱扫描,分析了油菜籽的脂肪、蛋白质和水分的含量,并采用偏最小二乘回归(PLSR)建立了相应的模型。油菜籽脂肪含量的校正相关系数为0.9865、预测相关系数为0.9672;蛋白质含量的校正相关系数为0.9854、预测相关系数系数为0.9636;水分含量的校正相关系数为0.9875、预测相关系数为0.9614。模型评估的结果表明,该光谱仪能够满足油菜籽成分检测的需求,验证该光谱仪在商业领域具有重要的应用价值。

关键词：数字微镜器件近红外光谱仪阿达玛信噪比嵌入式油菜籽

A High-Order Fully Actuated System Approach for a Class of Nonlinear Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2022年第2期35卷 714-730页

作者： GU Dake wang shuo School of Automation Engineering Northeast Electric Power UniversityJilin 132012China

This paper utilizes the high-order fully actuated(HOFA)system approach to synthesize a class of nonlinear ***,the original nonlinear system can be rewritten in a quasi-linear form,which is more general than other nonlinear systems,such as strict-feedback *** on a rank condition,the quasi-linear system can be transformed into a canonical ***,a simple transformation is adopted to convert the above canonical form into the HOFA *** an HOFA model is derived,the authors design a controller to make the closed-loop system a constant linear system with the desired ***,a numerical example illustrates the fitness and effectiveness of the proposed approach.

关键词： Canonical form closed-loop eigenstructure full-actuation high-order systems quasilinear systems

A POSTERIORI ESTIMATOR OF NONCONFORMING FINITE ELEMENT METHOD FOR FOURTH ORDER ELLIPTIC PERTURBATION PROBLEMS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2008年第4期26卷 554-577页

作者： shuo Zhang Ming wang LMAM and School of Mathematical Sciences Peking University Beijing 100871 China

In this paper, we consider the nonconforming finite element approximations of fourth order elliptic perturbation problems in two dimensions. We present an a posteriori error estimator under certain conditions, and give an h-version adaptive algorithm based on the error estimation. The local behavior of the estimator is analyzed as well. This estimator works for several nonconforming methods, such as the modified Morley method and the modified Zienkiewicz method, and under some assumptions, it is an optimal one. Numerical examples are reported, with a linear stationary Cahn-HiUiard-type equation as a model problem.

关键词： Fourth order elliptic perturbation problems Nonconforming finite elementmethod A posteriori error estimator Adaptive algorithm Local behavior.

Performance-Centric Optimization for Racetrack Memory Based Register File on GPUs

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2016年第1期31卷 36-49页

作者： Yun Liang shuo wang Center for Energy-Efficient Computing and Applications ( CECA) School of Electrical Engineering and Computer Sciences Peking University Beijing 100871 China

The key to high performance for GPU architecture lies in its massive threading capability to drive a large number of cores and enable execution overlapping among threads. However, in reality, the number of threads that can simultaneously execute is often limited by the size of the register file on GPUs. The traditional SRAM-based register file takes up so large amount of chip area that it cannot scale to meet the increasing demand of GPU applications. Racetrack memory （RM） is a promising technology for designing large capacity register file on GPUs due to its high data storage density. However, without careful deployment of RM-based register file, the lengthy shift operations of RM may hurt the performance. In this paper, we explore RM for designing high-performance register file for GPU architecture. High storage density RM helps to improve the thread level parallelism （TLP）, but if the bits of the registers are not aligned to the ports, shift operations are required to move the bits to the access ports before they are accessed, and thus the read/write operations are delayed. We develop an optimization framework for RM-based register file on GPUs, which employs three different optimization techniques at the application, compilation, and architecture level, respectively. More clearly, we optimize the TLP at the application level, design a register mapping algorithm at the compilation level, and design a preshifting mechanism at the architecture level. Collectively, these optimizations help to determine the TLP without causing cache and register file resource contention and reduce the shift operation overhead. Experimental results using a variety of representative workloads demonstrate that our optimization framework achieves up to 29% （21% on average） performance improvement.

关键词： register file racetrack memory GPU

Pathological Microstructure of a Miocene Ostrich Eggshell from Asia

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

Acta Geologica Sinica(English Edition) 2007年第5期81卷 697-702页

作者： wang shuo Department of Biological Science Tianjin Normal University Tianjin 300387

Struthio linxiaensis is the oldest fossil ostrich from Asia till today. This paper analyzes the microstructure of the eggshell of Struthio linxiaensis. The SEM and light microscopic results show that a pathological structure occurred associated with the formation of pore canal. The feature of this structure is that crystals of the columnar layer are around the lower part of the pore canal, and formed a broad structure. This structure unit contracts upwards more severely than the canal and looks like a ＂garlic＂, which was observed in aumiotes eggshells for the first time. Many evidences indicate that this structure was deposited with the columns simultaneously. The radial section view suggests that the ＂garlic structure＂ is not a result of antiperistaltic waves in the avian oviduct. The most possible process of the ＂garlic structure＂ formation is the column units around the pore canals with imperfect acidifying when calcified, or have some correlations with the changes in the protein profiles of the organic matrix in the calcareous eggshell.

关键词： Struthio linxiaensis ostrich egg pathological structure Miocene Linxia Basin

Research on Key Technologies of Network Security Situational Awareness for Attack Tracking Prediction

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2019年第1期28卷 162-171页

作者： KOU Guang wang shuo TANG Guangming Artificial Intelligence Research Center National Innovation Institute of Defense Technology Information Engineering University

This paper analyzed the existing network security situation evaluation methods and discovered that they cannot accurately reflect the features of large-scale,synergetic, multi-stage gradually shown by network attack behaviors. For this purpose, the association between attack intention and network configuration information was deep analyzed. Then a network security situation evaluation method based on attack intention recognition was proposed. Unlike traditional method, the evaluation method was based on intruder. This method firstly made causal analysis of attack event and discovered and simplified intrusion path to recognize every attack phases, then realized situation evaluation based on the attack phases. Lastly attack intention was recognized and next attack phase was forecasted based on achieved attack phases, combined with vulnerability and network connectivity. A simulation experiments for the proposed network security situation evaluation model is performed by network examples. The experimental results show that this method is more accurate on reflecting the truth of attack. And the method does not need training on the historical sequence, so the method is more effective on situation forecasting.

关键词： Multi-stage attack Situation evaluation Network security Intention recognition Causal analysis

Prediction and Measurement Techniques for Radiated EMI of Power Converters with Cables

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2022年第4期8卷 1-10页

作者： Zhedong Ma shuo wang Power Electronics and Electrical Power Research Lab University of Florida32611 USA

Recently,radiated electromagnetic interference(EMI)has become a research hotspot in power electronics systems,as the switching frequencies of power electronics systems have increased significantly with the adoption of wide-bandgap *** this article,a generalized radiated EMI model for power electronics converters with power cables is first *** radiated EMI model is then developed for a flyback power converter with critical ground impedance *** on the developed model,accurate high-frequency parameter extraction techniques and a radiated EMI prediction technique are developed and experimentally ***,essential measurement techniques are identified and developed to accurately extract parameters for accurate EMI *** effects of the resolution bandwidth of the spectrum analyzer and critical PCB ground impedance on the radiated EMI are experimentally ***’s impact on the common-mode(CM)choke’s impedance and the radiated EMI is further *** for minimizing the undesired near-field couplings in parameter extraction are *** predicted EMI properly agreed with the measured EMI in the range of 30-230 MHz based on the EN550323 m class B standard.

关键词： Radiated electromagnetic interference power converters power cables spectrum analyzer resolution bandwidth

Lin28 as a therapeutic target for central nervous system regeneration and repair

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

Neural Regeneration Research 2024年第2期19卷 397-398页

作者： shuo wang Shuxin Li Shriners Hospitals Pediatric Research Center Department of Neural SciencesLewis Katz School of Medicine at Temple UniversityPhiladelphiaPAUSA

Axon disconnection in the central nervous system(CNS) usually causes signal transduction failure and severe functional deficits in patients with neurological disorders. Currently, there is no cure for patients with CNS axon injury and they usually suffer from life-long neurological defects(e.g., paralysis, loss of sensory function, and autonomic dysfunction) and life-threatening complications(e.g., autonomic dysreflexia).

关键词： paralysis therapeutic system

Stabilizing sodium metal anode through facile construction of organicmetal interface

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第3期31卷 133-139,I0005页

作者： Jiaolong Zhang shuo wang Wenhui wang Baohua Li School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808GuangdongChina International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060GuangdongChina School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School(SIGS)Shenzhen 518055GuangdongChina

Implementation of sodium metal anode is highly desired for sodium batteries due to its high theoretical capacity and low redox ***,formation of unstable solid electrolyte interphase(SEI)and uncontrollable growth of dendrites during charge/discharge cycles greatly hinder the practical application of sodium metal *** this study,an organic-metal artificial layer made of PVdF and Bi was constructed to protect Cu current collector via a facile coating method,leading to smooth and dense sodium plating/stripping,which in retern enables stable cycling and high coulombic efficiency(CE).At 1 mA cm^(−2),PB@Cu current collector presents extended lifetime of~2500 h with high sodium utilization of 50%,which is approximately six times higher than Cu current ***@Cu electrode also displays high average CE of 99.92%and 99.95%over 2500 and 1300 cycles at 1 and 2 mA cm^(−2) respectively,which is in sharp contrast to the low and tremendously fluctuant CE gained from bare Cu ***,stable capacity of>90 mAh g^(−1) over 150 cycles is realized for PB@Cu-based full cell assembled with NVP cathode at a low negative-positive capacity ratio of~3.5,which is significantly higher than 37.2 mAh g^(−1) obtained from NVP/Cu at 150th *** superior electrochemical performance of PB@Cu current collector is revealed to originate from the alloyed Na_(3)Bi phase with high sodium conductivity and robust mechanical strength as well as the formation of NaF-rich SEI with fast sodium ion migration,which enable dendrite-free morphology during plating/stripping cycles.

关键词： Sodium metal anode Organic-metal artificial layer Bi PVdF Solid electrolyte interphase