检索结果-南通市图书馆

SMConf: One-Size-Fit-Bunch, Automated Memory Capacity Configuration for In-Memory Data Analytic Platform

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

Computers, Materials & Continua 2021年第2期66卷 1697-1717页

作者： yi Liang Shaokang Zeng Xiaoxian xu Shilu Chang xing Su Faculty of Information Technology Beijing University of TechnologyBeijing100124China Department of Informatics University of ZurichZurichCH-8050Switzerland

Spark is the most popular in-memory processing framework for big data *** is the crucial resource for workloads to achieve performance acceleration on *** extant memory capacity configuration approach in Spark is to statically configure the memory capacity for workloads based on user’s ***,without the deep knowledge of the workload’s system-level characteristics,users in practice often conservatively overestimate the memory utilizations of their workloads and require resource manager to grant more memory share than that they actually need,which leads to the severe waste of memory *** address the above issue,SMConf,an automated memory capacity configuration solution for in-memory computing workloads in Spark is *** is designed based on the observation that,though there is not one-size-fit-all proper configuration,the one-size-fit-bunch configuration can be found for in-memory computing *** classifies typical Spark workloads into categories based on metrics across layers of Spark system *** each workload category,an individual memory requirement model is learned from the workload’s input data size and the strong-correlated configuration *** an ad-hoc workload,SMConf matches its memory requirement signature to one of the workload categories with small-sized input data and determines its proper memory capacity configuration with the corresponding memory requirement *** results demonstrate that,compared to the conservative default configuration,SMConf can reduce the memory resource provision to Spark workloads by up to 69%with the slight performance degradation,and reduce the average turnaround time of Spark workloads by up to 55%in the multi-tenant environments.

关键词： Spark memory capacity automated configuration

The ringing of quantum corrected Schwarzschild black hole with GUP

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

Communications in Theoretical Physics 2022年第8期74卷 125-133页

作者： Yujia xing yi Yang Dong Liu Zheng-Wen Long Zhaoyi xu College of Physics Guizhou UniversityGuiyang 550025China

Schwarzschild black holes with quantum corrections are studied under scalar field perturbations and electromagnetic field perturbations to analyze the effect of the correction term on the potential function and quasinormal mode(QNM).In classical general relativity,spacetime is continuous and there is no existence of the so-called minimal *** introduction of the correction items of the generalized uncertainty principle,the parameterβ,can change the singularity structure of the black hole gauge and may lead to discretization in time and *** apply the sixth-order WKB method to approximate the QNM of Schwarzschild black holes with quantum corrections and perform numerical analysis to derive the results of the ***,we find that the effective potential and QNM in scalar fields are larger than those in electromagnetic fields.

关键词： quantum corrections black hole quasinormal mode generalized uncertainty principle

Probing into the Possible Range of the U Bosonic Coupling Constants in Neutron Stars Containing Hyperons

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第5期23卷 180-189页

作者： Yan xu Bin Diao yi-Bo Wang Xiu-Lin Huang xing-xing Hu Zi Yu Changchun Observatory National Astronomical ObservatoriesChinese Academy of SciencesChangchun 130117China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China College of Science Nanjing Forestry UniversityNanjing 210037China

The range of the U bosonic coupling constants in neutron star matter is a very interesting but still unsolved problem which has multifaceted influences in nuclear physics,particle physics,astrophysics and *** combination of the theoretical numerical simulation and the recent observations provides a very good opportunity to solve this *** the present work,the range of the U bosonic coupling constants is inferred based on the three relations of the mass–radius,mass-frequency and mass-tidal deformability in neutron stars containing hyperons using the GM1,TM1 and NL3 parameter sets under the two flavor symmetries of SU(6)and SU(3)in the framework of the relativistic mean field *** with observations from PSRs J1614-2230,J0348+0432,J2215-5135,J0952-0607,J0740+6620,J0030-0451,J1748-2446ad,XTE J1739-285,GW170817 and GW190814 events,our numerical results show that the U bosonic coupling constants may tend to be within the range from 0 to 20 GeV^(-2)in neutron star containing ***,the numerical results of the three relations obtained by the SU(3)symmetry are better in accordance with observation data than those obtained by the SU(6)*** results will help us to improve the strict constraints of the equation of state for neutron stars containing hyperons.

关键词： stars neutron-stars interiors-stars luminosity function-mass function-stars massive-dense matter-equation of state-gravitational waves

乳香外洗方联合肢体功能锻炼治疗脑梗死后SHS临床观察

在线全文

学校读者我要写书评

暂无评论

中国现代医学杂志 2018年第12期28卷 74-78页

作者：刘青黄德弘黄坚红王成银许幸仪翁旭亮何子意广州市中医医院脑病科广东广州510130

目的探讨乳香外洗方联合肢体功能锻炼治疗脑梗死后肩手综合征(SHS)的疗效。方法选取脑梗死后SHS患者64例,按信封法随机分为联合组和对照组,每组各32例。两组均给予神经内科常规治疗和肢体功能锻炼,连续治疗14 d。联合组行乳香外洗方患... 详细信息

目的探讨乳香外洗方联合肢体功能锻炼治疗脑梗死后肩手综合征(SHS)的疗效。方法选取脑梗死后SHS患者64例,按信封法随机分为联合组和对照组,每组各32例。两组均给予神经内科常规治疗和肢体功能锻炼,连续治疗14 d。联合组行乳香外洗方患肢熏蒸治疗,25 min/次,1次/d,连续治疗14 d;对照组行热水患肢熏蒸治疗,25 min/次,1次/d,连续治疗14 d。比较评价两组疗效、治疗前后简式FuglMeyer法运动功能评分(FMA)、Ashworth痉挛评分、上肢关节疼痛视觉模拟评分(VAS)及脑梗死专用生活质量量表(SS-QOL)。统计比较两组满意度和不良反应发生情况。结果与对照组比较,联合组治疗有效率、患者满意度、治疗1和2周FMA及SS-QOL均提高,治疗1和2周Ashworth痉挛评分与VAS降低(P0.05)。结论乳香外洗方联合肢体功能锻炼治疗脑梗死后SHS疗效良好,可有效缓解疼痛并改善患者肢体功能、生存质量及满意度,且安全性良好,值得临床推广。

关键词：乳香外洗方联合肢体功能锻炼脑梗死肩手综合征

Photonic quantum network transmission assisted by the weak cross-Kerr nonlinearity

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2018年第6期61卷 8-23页

作者： Feng Wang Ming-xing Luo Gang xu Xiu-Bo Chen yi-Xian Yang College of Mathematical Sciences Dezhou University Information Security and National Computing Grid Laboratory Southwest Jiaotong University School of Software Engineering Beijing University of Posts and Telecommunications Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications

Classical network coding permits all internal nodes to encode or decode the incoming messages over proper fields in order to complete a network multicast. Similar quantum encoding scheme cannot be easily followed because of various quantum no-go theorems. In this paper, to avoid these theorems in quantum multiple-source networks, we present a photonic strategy by exploring quantum transferring approaches assisted by the weak cross-Kerr nonlinearity. The internal node may nearly deterministically fuse all incoming photons into a single photon with multiple modes. The fused single photon may be transmitted using twophotonic hyperentanglement as a quantum resource. The quantum splitting as the inverse operation of the quantum fusion allows forwarding quantum states under the quantum no-cloning theorem. Furthermore, quantum addressing schemes are presented to complete the quantum transmissions on multiple-source networks going beyond the classical network broadcasts or quantum n-pair transmissions in terms of their reduced forms.

关键词： photonic network transmission quantum fusion quantum teleportation cross-Kerr nonlinearity

A Fully Distributed Approach to Optimal Energy Scheduling of Users and Generators Considering a Novel Combined Neurodynamic Algorithm in Smart Grid

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2021年第7期8卷 1325-1335页

作者： Chentao xu xing He the Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing College of Electronic and Information EngineeringSouthwest UniversityChongqing 400715China

A fully distributed microgrid system model is presented in this *** the user side,two types of load and plug-in electric vehicles are considered to schedule energy for more *** charging and discharging states of the electric vehicles are represented by the zero-one variables with more *** solve the nonconvex optimization problem of the users,a novel neurodynamic algorithm which combines the neural network algorithm with the differential evolution algorithm is designed and its convergence speed is faster.A distributed algorithm with a new approach to deal with the inequality constraints is used to solve the convex optimization problem of the generators which can protect their *** results and comparative experiments show that the model and algorithms are effective.

关键词： Differential evolution algorithm distributed algorithm electric vehicle neural network zero-one variable.

Photoelectric properties ofβ-Ga_(2)O_(3) thin films annealed at different conditions

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第4期41卷 1375-1379页

作者： Tuo Sheng xing-Zhao Liu Ling-xuan Qian Bo xu yi-Yu Zhang School of Microelectronics and Solid-State Electronics University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054China

In this work,metal–semiconductor–metal solar-blind ultraviolet photoconductors were fabricated based on theβ-Ga_(2)O_(3) thin films which were grown on the c-plane sapphire substrates by molecular beam ***,the effects ofβ-Ga_(2)O_(3) annealing on both its material character-istics and the device photoconductivity were ***β-Ga_(2)O_(3) thin films were annealed at 800,900,1000,and 1100°C,***,the annealing time was fixed at 2 h,and the annealing ambients were oxygen,nitro-gen,and vacuum(4.9×10^(-4 )Pa),*** crys-talline quality and texture of theβ-Ga_(2)O_(3) thin films before and after annealing were investigated by X-ray diffraction(XRD),showing that higher annealing temperature can result in a weaker intensity of(402)diffraction peak and a lower device ***,the vacuum-annealed sam-ple exhibits the highest photoresponsivity compared with the oxygen-and nitrogen-annealed samples at the same annealing *** addition,the persistent photoconductivity effect is effectively restrained in the oxygen-annealed sample even with the lowest photoresponsivity.

关键词： Molecular beam epitaxy β-Ga_(2)O_(3)thin fllms Annealing Photoconductor

Implementation of high-fidelity neutronics and thermal–hydraulic coupling calculations in HNET

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第11期33卷 120-132页

作者： Yan-Ling Zhu xing-Wu Chen Chen Hao yi-Zhen Wang Yun-Lin xu Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering UniversityHarbin 150001China Institute of Nuclear and New Energy Technology(INET) Tsinghua UniversityBeijing 100084China Purdue University West LafayetteIN 47907USA

To perform nuclear reactor simulations in a more realistic manner,the coupling scheme between neutronics and thermal-hydraulics was implemented in the HNET program for both steady-state and transient *** simplicity,efficiency,and robustness,the matrixfree Newton/Krylov(MFNK)method was applied to the steady-state coupling *** addition,the optimal perturbation size was adopted to further improve the convergence behavior of the *** the transient coupling simulation,the operator splitting method with a staggered time mesh was utilized to balance the computational cost and ***,VERA Problem 6 with power and boron perturbation and the NEACRP transient benchmark were simulated for *** numerical results show that the MFNK method can outperform Picard iteration in terms of both efficiency and robustness for a wide range of ***,the reasonable agreement between the simulation results and the reference results for the NEACRP transient benchmark verifies the capability of predicting the behavior of the nuclear reactor.

关键词： Coupling calculation High-fidelity neutronics Thermal-hydraulics Matrix-free Newton/Krylov method Transient simulation

吕宋海峡海域黑潮对近惯性内波传播的调制作用研究

在线全文

学校读者我要写书评

暂无评论

中国海洋大学学报（自然科学版） 2025年第1期55卷 13-24页

作者：廖晓娴许行黄晓冬桑康凯中国海洋大学海洋与大气学院山东青岛266100 青岛海洋气象研究院山东青岛266034 中国海洋大学三亚海洋研究院海南三亚572025 中国海洋大学深海圈层与地球系统前沿科学中心物理海洋教育部重点实验室山东青岛266100

本文基于2010年8月—2011年4月吕宋海峡黑潮两侧潜标观测的流速数据,研究了台风引起的近惯性内波在黑潮调制下的传播特征。观测结果表明,台风“鲇鱼”经过吕宋海峡附近后,上层海洋有强烈的近惯性内波生成,最大近惯性流速达到0.4 m·s^(-... 详细信息

本文基于2010年8月—2011年4月吕宋海峡黑潮两侧潜标观测的流速数据,研究了台风引起的近惯性内波在黑潮调制下的传播特征。观测结果表明,台风“鲇鱼”经过吕宋海峡附近后,上层海洋有强烈的近惯性内波生成,最大近惯性流速达到0.4 m·s^(-1),黑潮东侧(太平洋)的最大近惯性动能比西侧(南海)的强2~3倍。这种空间差异与风能输入不一致,黑潮东侧的风功要弱于西侧。流速和剪切的功率谱分析结果显示,台风“鲇鱼”期间黑潮东侧明显的上层近惯性谱峰的频率在黑潮东侧明显低于黑潮西侧。黑潮形态变化引起的相应流场和涡度场变化能够对近惯性内波传播进行调制。射线追踪实验结果表明,黑潮的平流作用可以使近惯性内波远离源地,其流轴西侧正涡度阻碍近惯性内波传播,而其东侧负涡度可以使近惯性内波聚集。该结果所揭示的近惯性内波的传播过程和分布特征可为理解全球海洋近惯性内波的再分配问题提供思路。

关键词：吕宋海峡近惯性内波台风黑潮射线追踪

维普期刊数据库博看期刊