检索结果-南通市图书馆

Technological Exploration of RRAM Crossbar Array for Matrix-Vector Multiplication

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 3-19页

作者： Lixue Xia Peng Gu Boxun Li Tianqi Tang Xiling Yin Wenqin Huangfu shimeng yu yu Cao yu Wang Huazhong Yang Department of Electronic Engineering Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology (TNList) Tsinghua University Beijing 100084 China School of Electrical Computer and Energy Engineering Arizona State University Arizona 85281 U.S.A.

Matrix-vector multiplication is the key operation for many computationally intensive algorithms. The emerging metal oxide resistive switching random access memory （RRAM） device and RRAM crossbar array have demonstrated a promising hardware realization of the analog matrix-vector multiplication with ultra-high energy efficiency. In this paper, we analyze the impact of both device level and circuit level non-ideal factors, including the nonlinear current-voltage relationship of RRAM devices, the variation of device fabrication and write operation, and the interconnect resistance as well as other crossbar array parameters. On top of that, we propose a technological exploration flow for device parameter configuration to overcome the impact of non-ideal factors and achieve a better trade-off among performance, energy, and reliability for each specific application. Our simulation results of a support vector machine （SVM） and Mixed National Institute of Standards and Technology （MNIST） pattern recognition dataset show that RRAM crossbar array based SVM is robust to input signal fluctuation but sensitive to tunneling gap deviation. A further resistance resolution test presents that a 6-bit RRAM device is able to realize a recognition accuracy around 90%, indicating the physical feasibility of RRAM crossbar array based SVM. In addition, the proposed technological exploration flow is able to achieve 10.98% improvement of recognition accuracy on the MNIST dataset and 26.4% energy savings compared with previous work. Experimental results also show that more than 84.4% power saving can be achieved at the cost of little accuracy reduction.

关键词： resistive switching random access memory （RRAM） machine learning electronic design automation matrixvector multiplication non-ideal factor

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

基于三分支混合特征提取的双目立体匹配算法

机器人 2024年第4期46卷 414-424页

作者：范诗萌孙炜覃宇覃业宝胡曼倩刘崇沛湖南大学电气与信息工程学院湖南长沙410082 湖南大学整车先进设计制造技术全国重点实验室湖南长沙410082 长沙理工大学计算机与通信工程学院湖南长沙410076

基于深度学习的双目立体匹配算法大多采用卷积神经网络(CNN)进行特征提取。但该网络存在感受野有限、卷积核权重共享等固有的局限性,难以提取到强辨识度的特征,易导致弱纹理区域、细节区域等有挑战性区域的匹配精度较低。针对该问题,本... 详细信息

基于深度学习的双目立体匹配算法大多采用卷积神经网络(CNN)进行特征提取。但该网络存在感受野有限、卷积核权重共享等固有的局限性,难以提取到强辨识度的特征,易导致弱纹理区域、细节区域等有挑战性区域的匹配精度较低。针对该问题,本文提出一种基于三分支混合特征提取的双目立体匹配算法。具体地,将CNN分支、Swin Transformer分支、融合分支并联设置,并对左、右图像进行特征提取,并联分支设置有效地保留了CNN的局部特征表达能力和Swin Transformer框架的全局特征表达能力。融合分支由多阶段的全局-局部信息适配器组成,不仅能实现本阶段全局信息和局部信息的融合与表达,而且能够跨不同阶段有效地传播特征,从而筛选出适用于弱纹理区域和细节区域的强相关特征信息,提高了立体匹配的精度。在SceneFlow数据集上进行的消融实验验证了本文算法的有效性。利用SceneFlow、KITTI 2012、KITTI 2015数据集进行了测试。本文方法在SceneFlow数据集上的端点误差为0.652个像素;在KITTI 2012数据集上的非遮挡区域,视差误差大于5个像素的百分比为0.79%。结果表明本文算法具有优异的立体匹配精度。

关键词：双目立体匹配卷积神经网络特征提取局部特征全局特征

肝动脉灌注化疗联合仑伐替尼治疗巴塞罗那临床肝癌B或C期肝细胞癌

在线全文

学校读者我要写书评

暂无评论

中国介入影像与治疗学 2024年第2期21卷 70-74页

作者：于海东郭应兴雷振武杨海明孙世蒙马存凯青海大学附属医院介入诊疗科青海西宁810000

目的观察肝动脉灌注化疗(HAIC)联合仑伐替尼治疗巴塞罗那临床肝癌(BCLC)B或C期肝细胞癌(HCC)效果,分析影响患者生存时间的因素。方法回顾性分析104例BCLC B或C期HCC患者资料,根据治疗方案将其归入观察组(46例,接受HAIC联合仑伐替尼治疗... 详细信息

目的观察肝动脉灌注化疗(HAIC)联合仑伐替尼治疗巴塞罗那临床肝癌(BCLC)B或C期肝细胞癌(HCC)效果,分析影响患者生存时间的因素。方法回顾性分析104例BCLC B或C期HCC患者资料,根据治疗方案将其归入观察组(46例,接受HAIC联合仑伐替尼治疗)及对照组(58例,仅接受HAIC);比较2组疗效、不良反应及患者总生存期(OS)和无进展生存期(PFS),以Cox回归分析评估OS影响因素。结果治疗后3、6个月,观察组改良实体瘤疗效评价标准(mRECIST)评估结果均优于对照组(P均0.05)。观察组患者总生存率高于对照组(P0.05)。观察组皮疹发生率高于对照组(P<0.05)。多因素Cox回归分析结果显示,相比单一HAIC,HAIC联合仑伐替尼[风险比(HR)=0.425,95%CI(0.255,0.791)]可延长患者OS;相比治疗前美国东部肿瘤协作组(ECOG)评分1、AFP≥400μg/ml、瘤灶数目≥3及BCLC C期,治疗前ECOG评分0、AFP<400μg/ml、瘤灶数目≤2及BCLC B期均为HCC患者OS独立保护因素(P均<0.05)。结论 HAIC联合仑伐替尼治疗BCLC B期或C期HCC安全、有效;治疗前ECOG评分、血清AFP水平、瘤灶数目及BCLC分期均为OS影响因素。

关键词：癌,肝细胞化学疗法癌症局部灌注预后

在线全文

学校读者我要写书评

暂无评论

橙皮苷及其衍生物抗癌作用机制的研究进展

中国实验方剂学杂志 2024年第13期30卷 259-270页

作者：田秀蓉王昊于鹏龙吕世盟李勇华蒋祥林杨勤吕武宾刘霞马月香山东中医药大学济南250355 重庆三峡医药高等专科学校重庆404120 中国中医科学院中医临床基础医学研究所北京100700 重庆三峡医药高等专科学校附属人民医院重庆404120

该文通过检索中国知网、万方、PubMed等电子数据库,回顾过去10年发表的关于橙皮苷预防及治疗癌症的相关文献,总结了橙皮苷抗癌机制的研究进展。橙皮苷的药理作用十分广泛,具有抗炎、抗氧化、抗菌、抗病毒、抗癌、调节免疫力、抗辐射、... 详细信息

该文通过检索中国知网、万方、PubMed等电子数据库,回顾过去10年发表的关于橙皮苷预防及治疗癌症的相关文献,总结了橙皮苷抗癌机制的研究进展。橙皮苷的药理作用十分广泛,具有抗炎、抗氧化、抗菌、抗病毒、抗癌、调节免疫力、抗辐射、神经保护、心血管保护等作用。其抗癌机制主要包括抑制癌细胞增殖、促进癌细胞凋亡、减少血管生成、抑制癌细胞侵袭和迁移、调节免疫与自噬、抗炎抗氧化。这种多方面的抗癌机制使橙皮苷对多种癌症显示出化学预防和治疗效果,使其成为一种广谱抗癌药。该文还总结了橙皮苷与顺铂、阿霉素、环磷酰胺、紫杉醇4种抗癌药合用的效果,发现橙皮苷能增强这些抗癌药对癌细胞的增殖抑制作用,还能降低耐药性和不良反应。由于橙皮苷水溶性较差,生物利用度不高,临床使用受到一定限制,因此还总结了目前通过结构修饰或与其他化学物质、纳米载药制剂组合获得的衍生物来提高其生物利用度的方法。发现橙皮苷的衍生物既保留了橙皮苷的抗癌疗效,又有效克服了橙皮苷水溶性差、生物利用率低等缺陷,很好地预测了橙皮苷及其衍生物具备的良好应用前景。

关键词：橙皮苷衍生物抗癌作用机制研究进展

Hierarchical carbon nanosheet confined defective MoS_(x) cathode towards long-cycling zinc-ion-battery

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 9364-9370页

作者： Xiaoqi Wang shimeng Zhang Rui Yang Shengchi Bai Jianbo Li yu Wu Bowen Jin Xu Jin Mingfei Shao Bo Wang School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Research Center of New Energy PetroChina Research Institute of Petroleum Exploration&DevelopmentBeijing 100083China

Aqueous zinc-ion batteries(ZIBs)have attracted increasing attention due to their low cost and high safety.MoS_(2) is a promising cathode material for aqueous ZIBs due to its favorable Zn^(2+)accommodation ability.However,the structural strain and large volume changes during intercalation/deintercalation lead to exfoliation of active materials from substrate and cause irreversible capacity fading.In this work,a highly stable cathode was developed by designing a hierarchical carbon nanosheet-confined defective MoS_(x)material(CNS@MoS_(x)).This cathode material exhibits an excellent cycling stability with high capacity retention of 88.3%and~100%Coulombic efficiency after 400 cycles at 1.2 A·g^(-1),much superior compared to bare MoS_(2).Density functional theory(DFT)calculations combined with experiments illustrate that the promising electrochemical properties of CNS@MoS_(x)are due to the unique porous conductive structure of CNS with abundant active sites to anchor MoS_(x)via strong chemical bonding,enabling MoS_(x)to be firmly confined on the substrate.Moreover,this unique hierarchical complex structure ensures the fast migration of Zn^(2+)within MoS_(x)interlayer.

关键词： aqueous zinc-ion batteries MoS_(x)cathode porous carbon nanosheets long-cycling hierarchical structure

Optimizing the electromagnetic wave absorption performance of designed hollow CoFe_(2)O_(4)/CoFe@C microspheres

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 Materials Science & Technology 2021年第22期81卷 190-202页

作者： Jianwen Ge shimeng Liu Li Liu yu Cui Fandi Meng Yixing Li Xuefeng Zhang Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China Institute of Metal Research Chinese Academy of SciencesShenyang110016China

Whereas hollow composites present some superiorities like abundant micro interfaces,outstanding impedance matching as the responses of electromagnetic wave(EMW),but versatile designs including crystal transformation,heterogeneous structures and magnetic exchange coupling to further contribution are even not designed or stressed together in previous literatures.In this article,rational design on the hollow CoFe_(2)O_(4)/CoFe@C architecture has been conducted by a sequential process of self-sacrifice by combustion,in-suit polymerization and calcination.Results of morphology observation exhibit that heterogeneous CoFe_(2)O_(4)/CoFe@C composites were generated via crystal transformation from CoFe_(2)O_(4) to CoFe alloys with encapsulated carbon,together with ultimate growth of crystal particles.As for three carbon-based architectures,relatively low-graphitization carbon layers are favorable for enhancing impedance matching and polarization relaxation,but suppressing the conductive loss essentially.Moderate carbon content endows sample S2 with the maximum magnetic saturation(Ms)of 152.4 emu g^(-1).The optimized RL of sample S3 is up to-51 dB with 30 wt%loading,and the effective absorption band(EAB)is of 5.9 GHz at the thickness of 2.17 mm,while 6.0 GHz can be reached at 2.5 mm.Therefore,this hollow multi-interfaces design definitely shed light on novel structure for new excellent absorbers.

关键词： CoFe_(2)O_(4)/CoFe@C Alloying processing Absorption performance Carbon layers

Recent progress on the hydrogen storage properties of ZrCo-based alloys applied in International Thermonuclear Experimental Reactor(ITER)

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2017年第3期27卷 58-65页

作者： Feng Wang Rongfeng Li Cuiping Ding Wukui Tang Yibo Wang shimeng Xu Ronghai yu Ying Wu School of Materials Science and Engineering Beihang University China Iron & Steel Research Institute Group Advanced Technology & Materials Co. Ltd

Under the development of International Thermonuclear Experimental Reactor（ITER） system aimed at realizing the controllable fusion reaction to solve the energy crisis fundamentally, there is an urgent need to find an appropriate material for tritium handling. ZrCo alloy is considered to be a promising candidate for the storage and delivery of hydrogen isotopes due to the favorable characteristics such as low plateau pressure for absorption, high dissociation pressure at moderate temperature and better ability of trapping;He. However, the hydrogen induced disproportionation and the slower recovery/deliverty rate of ZrCo-based alloys have limited their further application in ITER system. This review summarizes the efforts towards enhancing the hydrogen storage properties of ZrCo-based alloys including element substitution, surface modification, disproportionation mechanism investigation and the isotope effect study. Element substitution and surface modification play positive role to improve the anti-disproportionation ability and kinetic property of the alloys. However, the ZrCo-based alloys require to be further modified by more attempts such as new composition, novelty modification method or catalyst addition in order to better satisfy the application demands for tritium handling. Moreover, new insight for further understanding the inner disproportionation mechanisms of this material is needed by combining the advance characterization and theoretical analysis, which is in favor of addressing the disproportionation problem of the ZrCo-based alloys essentially.

关键词： ZrCo-based alloy Hydrogen storage properties Disproportionation reaction Element substitution Surface modification

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

肉类宰后成熟机制及成熟进程监测研究进展

食品科学 2023年第1期44卷 337-344页

作者：喻倩倩李诗萌程蓓刘硕孙承锋烟台大学生命科学学院山东烟台264005

宰后成熟是提高肉类食用品质(如嫩度、多汁性、风味等)的关键手段,常见的成熟方式有湿法成熟、干法成熟和干-湿结合的分步式成熟,不同成熟方式各有特点,最终目的都是提高肉的可食用性和适口性,但成熟时间过长会对肉的品质带来负面影响,... 详细信息

宰后成熟是提高肉类食用品质(如嫩度、多汁性、风味等)的关键手段,常见的成熟方式有湿法成熟、干法成熟和干-湿结合的分步式成熟,不同成熟方式各有特点,最终目的都是提高肉的可食用性和适口性,但成熟时间过长会对肉的品质带来负面影响,如造成严重的质量损失、过度的脂肪及蛋白氧化等问题。因此,明确宰后成熟机制、监控和优化成熟进程,在提高肉类食用品质的同时,最大限度地减少过度成熟导致的品质缺陷,对肉类产业发展具有重要意义。尽管目前不同成熟方式下成熟进程的监测及优化、肉品质预测的相关研究鲜有报道,但成熟进程的精准化控制将成为未来肉类产业发展的重要方向。本文综述了宰后不同成熟方式及对肉嫩度、风味、颜色和氧化稳定性的影响和作用机制,对基于肉表面霉菌覆盖率和电阻的干法成熟进程监测和基于组织渗出液的湿法成熟进程监测进行讨论和展望,以期为后续建立基于肌肉特异性的成熟策略提供理论支持。

关键词：肉宰后成熟食用品质成熟进程监测品质预测组织渗出液

Phosphorylation and function of DGAT1 in skeletal muscle cells

在线全文

学校读者我要写书评

暂无评论

Biophysics Reports 2015年第1期1卷 41-50页

作者： Jinhai yu Yiran Li Fei Zou shimeng Xu Pingsheng Liu National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Department of Biological Science and Biotechnology School of Biological Science and Medical EngineeringBeihang University Graduate School of Anhui Medical University General Hospital of Air Force

Aberrant intramuscular triacylglycerol(TAG) storage in human skeletal muscle is closely related to insulin insensitivity. Excessive lipid storage can induce insulin resistance of skeletal muscle, and under severe conditions, lead to type 2 diabetes. The balance of interconversion between diacylglycerol and TAG greatly influences lipid storage and utilization. Diacylglycerol O-acyltransferase 1(DGAT1) plays a key role in this process, but its activation and phosphorylation requires further dissection. In this study,12 putative conserved phosphorylation sites of DGAT1 were identified by examining amino acid conservation of DGAT1 in different species. Another 12 putative phosphorylation sites were also found based on bioinformatics predictions and previous reports. Meanwhile, several phosphorylation sites of DGAT1 were verified by phosphorylation mass spectrometry analysis of purified DGAT1 from mouse myoblast C2 C12 cells. Using single point mutations, a regulatory role of 3 putative phosphorylation sites was dissected. Finally, using truncation mutations, a potential domain of DGAT1 that was involved in the regulation of enzymatic activity was revealed. This study provides useful information for further understanding DGAT1 activity regulation.

关键词： DGAT1 Enzymatic activity Phosphorylation Single point mutation