检索结果-南通市图书馆

CSI Intelligent Feedback for Massive MIMO Systems in V2I Scenarios

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Communications 2021年第7期18卷 36-43页

作者： Shiyi Wang Yong liao School of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China

With the rapid development of the Internet of vehicles(IoV),vehicle to everything(V2X)has strict requirements for ultra-reliable and low latency communications(URLLC),and massive multiinput multi-output(MIMO)channel state information(CSI)feedback can effectively support URLLC communication in 5G vehicle to infrastructure(V2I)*** research applies deep learning(DL)to CSI feedback,but most of its algorithms are based on low-speed outdoor or indoor environments and assume that the feedback link is ***,the actual channel still has the influence of additive noise and nonlinear effects,especially in the high-speed V2I scene,the channel characteristics are more complex and *** response to the above problems,this paper proposes a CSI intelligent feedback network model for V2I scenarios,named residual mixnet(RM-Net).The network learns the channel characteristics in the V2I scenario at the vehicle user(User Equipment,UE),compresses the CSI and sends it to the channel;the roadside base station(Base Station,BS)receives the data and learns the compressed data characteristics,and then restore the original *** system simulation results show that the RM-Net training speed is fast,requires fewer training samples,and its performance is significantly better than the existing DL-based CSI feedback *** can learn channel characteristics in high-speed mobile V2I scenarios and overcome the influence of additive *** the same time,the network still has good performance under high compression ratio and low signal-to-noise ratio(SNR).

关键词： Internet of vehicles high speed mobility CSI feedback deep learning denoising

维普期刊数据库

Design and test of an inside-filling pneumatic precision centralized seed-metering device for rapeseed

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2017年第2期10卷 56-62页

作者： liao Yitao Wang Lei liao Qingxi Engineering College Huazhong Agricultural UniversityWuhan 430070China

The pneumatic precision seed-metering devices used in combination with negative air pressure to suck seed and positive air flow to drop seed could overcome the problem of rapeseed precision ***,these devices can only plant a single row at a time or need high airflow pressure,which complicates the seed-metering system and the seeder structure,deteriorate the working reliability and have high power *** overcome above shortcomings,a novel prototype of pneumatic precision centralized seed-metering device with seed inside-filling,sowing six rows at a time,was *** main structure and working principle of the prototype were described and the technical parameters were *** were conducted to investigate the influences of positive pressure,negative pressure,and rotating speed on the seeding *** stability of each row and the consistency between all rows associated with the seeding precision were analyzed to evaluate the performance of the *** results indicated that the prototype can meet the requirements of precision seeding and the seed keep intact without any obvious *** performance of the prototype was no significant difference when the positive pressure was fluctuated from 200 Pa to 1200 *** best seeding precision parameters in one row of the prototype was 92.48%of the qualified seeding index(Iqs)and 2.55%of the miss-seeding index(Imiss),when the rotating speed was 16 r/min,the positive pressure was 200 Pa and the negative pressure was–1600 *** the rotating speed was 16 r/min,the positive pressure was 200 Pa,and the negative pressure was–1400 Pa or–1600 Pa,the Iqs of six rows were above 86.5%,the stability coefficient of variation(CV)of each row were below 4.6%,and the consistency CV were below 0.9%.Further field experiment showed that the rapeseed sowed by the prototype had acceptable seeding *** CV of the numbers of rapeseed seedlings in the field of the total and each row were 6.

关键词： centralized seed-metering device seed inside-filling pneumatic precision sowing rapeseed

Hardy space estimates for bi-parameter Littlewood-Paley square functions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2020年第2期15卷 333-349页

作者： Fanghui liao Zhengyang LI School of Mathematics and Computational Sciences Xiangtan UniversityXiangtan 411105China School of Mathematics and Computational Sciences Hunan University of Science and TechnologyXiangtan 411201China

Suppose that g(f)are bi-parameter Littlewood-Paley square functions which were introduced by *** is known that the L^2(R^n×R^m)boundedness and the H1(R^n×R^m)-L1(R^n×R^m)boundedness of g(f)have been proved by *** and by *** and ***,*** this paper,we apply the vector-valued theory,the atomic decomposition of product Hardy spaces,and Journe’s covering lemma to show that g(f)are bounded from H^p(R^n×R^m)to Lp(R^n×R^m)with p smaller than 1.

关键词： Hardy space Littlewood-Paley square function Journe’s covering lemma atomic decomposition

Ultralow-power high-speed flip-flop based on multimode Fin FETs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2016年第4期59卷 83-93页

作者： Kai liao Xiaoxin CUI Nan liao Tian WANG Dunshan YU Xiaole CUI Institute of Microelectronics Peking University Key Laboratory of Integrated Microsystems Shenzhen Graduate School Peking University

In this paper, we first reconstruct a novel planar static contention-free single-phase-clocked flipflop(S2CFF) based on high-performance fin-type field-effect transistors(FinF ETs) to achieve high speed and ultralow power consumption. Benefiting from better control of the conductive channel, the shorted-gate(SGmode) FinF ET flip-flop obtains a persistent reduction of 56.7% in average power consumption as well as a considerable improvement in timing performance at a typical 10% data switching activity, while the low-power(LP-mode) FinF ET flip-flop promotes the power reduction to 61.8% without appreciable degradation in ***, through further analysis of the simulation results, we have revealed an unnecessary energy loss caused by the redundant leaps of internal nodes at the static input ‘0’, which has a noticeable negative impact on total power consumption at low data switching activity. In order to overcome this defect, a conditional precharge technique is introduced to control the charging path, and we demonstrate that the independent-gate(IG-mode)FinF ET is the best option for the added control transistor. The verification results indicate that our optimization reduces the power consumption by more than 50% at low data switching activity with an acceptable area and setup time penalty compared with that of LP-mode FinF ET flip-flop.

关键词： multimode FinF ET flip-flop ultralow-power high-speed high-performance

Construction of Intelligent Recommendation Retrieval Model of FuJian Intangible Cultural Heritage Digital Archives Resources

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第7期37卷 677-690页

作者： Xueqing liao Quanzhou University of Information Engineering School for Creative StudiesQuanzhouFujian362000China

In order to improve the consistency between the recommended retrieval results and user needs,improve the recommendation efficiency,and reduce the average absolute deviation of resource retrieval,a design method of intelligent recommendation retrieval model for Fujian intangible cultural heritage digital archive resources based on knowledge atlas is *** TG-LDA(Tag-granularity LDA)model is proposed on the basis of the standard LDA(Linear Discriminant Analysis)*** model is used to mine archive resource *** Pearson correlation coefficient is used to measure the relevance between *** on the measurement results,the FastText deep learning model is used to achieve archive resource *** to the classification results,TF-IDF(term frequency–inverse document frequency)algorithm is used to calculate the weight of resource retrieval keywords to achieve resource retrieval,and a recommendation model of intangible cultural heritage digital archives resources is built through the knowledge map to achieve comprehensive and personalized recommendation of *** experimental results show that the recommendation and retrieval results of the proposed method are more in line with users’needs,can provide users with personalized digital archive resources,and the average absolute deviation of resource retrieval is low,the recommendation efficiency is high,and the utilization effect of archive resources is effectively improved.

关键词： Knowledge map intangible cultural heritage digital archives intelligent recommendation search TG-LDA model fasttext model

Optimization of ferroelectricity and endurance of hafnium zirconium oxide thin films by controlling element inhomogeneity

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 Advanced Ceramics 2024年第7期13卷 1023-1031页

作者： Fei Yan Ke Cao Yang Chen Jiajia liao Min liao Yichun Zhou Shaanxi Key Laboratory of High-Orbits-Electron Materials and Protection Technology for Aerospace School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Xi’an Key Laboratory of Reconfigurable Chip and Materials School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Frontier Research Center of Thin Films and Coatings for Device Applications Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710126China

Ferroelectric thin films based on HfO_(2) have garnered increasing attention worldwide,primarily due to their remarkable compatibility with silicon and scalability,in contrast to traditional perovskite-structured ferroelectric ***,significant challenges remain in their widespread commercial utilization,particularly concerning their notable wake-up effect and limited *** address these challenges,we propose a novel strategy involving the inhomogeneous distribution of Hf/Zr elements within thin films and explore its effects on the ferroelectricity and endurance of Hf_(0.5)Zr_(0.5)O_(2) thin *** techniques such as grazing incidence X-ray diffraction,transmission electron microscopy,and piezoresponse force microscopy,we investigated the structural characteristics and domain switching behaviors of these *** experimental results indicate that the inhomogeneous distribution of Hf/Zr contributes to improving the frequency stability and endurance while maintaining a large remnant polarization in Hf_(0.5)Zr_(0.5)O_(2) ferroelectric thin *** adjusting the distribution of Zr/Hf within the Hf_(0.5)Zr_(0.5)O_(2) thin films,significant enhancements in the remnant polarization(2P_(r)>35μC/cm2)and endurance(>109)along with a reduced coercive voltage can be ***,the fabricated ferroelectric thin films also exhibit high dielectric tunability(≥26%)under a low operating voltage of 2.5 V,whether in the wake-up state or *** study offers a promising approach to optimize both the ferroelectricity and endurance of HfO_(2)-based thin films.

关键词： ferroelectric capacitors thin films ferroelectricity hafnium zirconium oxide

Cross-linked lipoic acid nanocapsules serve as H_(2)O_(2) amplifier to strengthen the H_(2)O_(2)-sensitive prodrug activation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第9期66卷 2654-2663页

作者： Jiangbing Tan Pei Jing Xiao Xiao Yulong liao Chunyan liao Shiyong Zhang College of Biomedical Engineering and National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China Department of Pharmacy the Affiliated Hospital of Southwest Medical UniversityLuzhou 646000China

The H_(2)O_(2) -triggered prodrug activation represents a hot topic while the low H_(2)O_(2) level of cancer cells hindered the complete activation of parent drugs and resulted in the poor therapeutic effect. Here, we developed an H_(2)O_(2) amplifier fabricated by crosslinked lipoic acid nanocapsules(cLANCs), which would selectively elevate the intracellular H_(2)O_(2) level of cancer cells 3.4-fold higher than that of untreated cancer cells so as to speed up the activation of parent drug from the loaded prodrugs(Pro-5-FU). The cytotoxicity showed that the killing effect of Pro-5-FU loaded in cLANCs(Pro-5-FU@cLANCs) arrived up to 1.6-time higher than that of Pro-5-FU alone against A549 cells, and was even close to free 5-FU. The in vivo anticancer evaluation gave the tumor inhibition rate(TIR) and survival rate(SR) of Pro-5-FU@cLANCs against A549 tumor-bearing nude mice up to 73.1% and 80%,respectively, much higher than those of Pro-5-FU(TIR: 41.2%, SR: 20%) or free 5-FU(TIR: 50.6%, SR: 0%). This nanodrug constructed the first example that utilizes the drug carriers as H_(2)O_(2) amplifier to strengthen the prodrug activation.

关键词： cancer therapy prodrug activation H_(2)O_(2)amplifier drug carrier

维普期刊数据库

Key characterization factors of accurate power modeling for Fin FET circuits

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2015年第2期58卷 182-194页

作者： MA KaiSheng CUI XiaoXin liao Kai liao Nan WU Di YU DunShan Institution of Microelectronics Peking University Department of Computer Science and Engineering The Pennsylvania State UniversityUniversity ParkPA 16801 USA

Due to its excellent device features, manufacture process compatibility and diversity of the circuit structures, The Fin FET is considered appropriate candidate for the conventional bulk-MOSFET in sub-22 nm technology nodes. However, the power estimation CAD tools for Fin FET are missing at the moment, which mainly results from the absence of Fin FET power analysis and Fin FET power model. Three key factors for Fin FET power model are: the dimension of the look-up-tables, that to find out the most significant factors that influence Fin FET power and to make them as indexes for the look-up-tables; the distance between sampling points; and the interpolation method. In this paper, various factors that may contribute to the Fin FET power consumption are evaluated. Of all the factors, the continuous ones are compared with sensitivity method. As to other discrete factors, methods of building them in power model are given according to the features of the each factor and the way it influences the power. Based on the simulation result, standard cell power library model for Fin FET is proposed. The research work lays foundation for accurate power analysis and modeling for high-level power analysis of Fin FET circuits. Besides, these key factors are also crucial for low-power Fin FET circuit design.

关键词： Fin FET power modeling leakage power internal power input slew output load

A consistent projection-based SUPG/PSPG XFEM for incompressible two-phase flows

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第5期28卷 1309-1322页

作者： Jian-Hui liao Zhuo Zhuang School of Aerospace Tsinghua University

In this paper, a consistent projection-based streamline upwind/pressure stabilizing Petrov-Galerkin （SUPG/PSPG） extended finite element method （XFEM） is presented to model incompressible immiscible two-phase flows. As the application of linear elements in SUPG/PSPG schemes gives rise to inconsistency in stabilization terms due to the inability to regenerate the diffusive term from viscous stresses, the numerical accuracy would deteriorate dramatically. To address this issue, projections of convection and pressure gradient terms are constructed and incorporated into the stabilization formulation in our method. This would substantially recover the consistency and free the practitioner from burdensome computations of most items in the residual. Moreover, the XFEM is employed to consider in a convenient way the fluid properties that have interfacial jumps leading to discontinuities in the velocity and pressure fields as well as the projections. A number of numerical examples are analyzed to demonstrate the complete recovery of consistency, the reproduction of interfacial discontinuities and the ability of the proposed projection-based SUPG/PSPG XFEM to model two-phase flows with open and closed interfaces.

关键词： Two-phase flow XFEM SUPG/PSPG algorithm Consistency Discontinuous projection

维普期刊数据库