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面向机器学习的数据库参数调优技术综述

计算机工程与应用 2024年第3期60卷 1-16页

作者：姜璐璐高锦涛宁夏大学信息工程学院银川750021 宁夏大数据与人工智能省部共建协同创新中心银川750021

大数据时代,数据规模庞大、应用场景复杂,为满足苛刻的性能要求,面对庞杂的数据库参数,给出高质量的参数调优结果挑战巨大。传统启发式调优算法或者人工干预方法很难普适地满足各类调优需求。机器学习因其强大的学习和泛化能力被广泛应... 详细信息

大数据时代,数据规模庞大、应用场景复杂,为满足苛刻的性能要求,面对庞杂的数据库参数,给出高质量的参数调优结果挑战巨大。传统启发式调优算法或者人工干预方法很难普适地满足各类调优需求。机器学习因其强大的学习和泛化能力被广泛应用于各种复杂场景,包括数据库参数调优。经过充分调研,给出学习式数据库参数调优技术的演化路线、依据路线,按照研究内容-存在问题-解决问题的思路,叙述传统参数调优技术、基于BO模型的参数调优技术以及基于RL的参数调优技术,展望未来的研究方向和所面临的挑战,希望为这一领域科研工作者提供有价值的参考。

关键词：数据库系统参数调优机器学习

基于浮标站和ERA5再分析资料的浙江沿海台风浪特征分析

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海洋技术学报 2024年第1期43卷 1-9页

作者：蒋璐璐姚日升王毅涂小萍宁波市气象台浙江宁波315012 宁波市生态环境气象中心浙江宁波315012 浙江省气象台浙江杭州310057

为了分析台风影响下浙江沿海风和浪的演变特点,利用浙江省海洋浮标站监测数据和欧洲中期天气预报中心第五代全球气候大气再分析数据(European Centre for Medium-Range Weather Forecasts Reanalysis v5,ERA5),选取2010年以来严重影响... 详细信息

为了分析台风影响下浙江沿海风和浪的演变特点,利用浙江省海洋浮标站监测数据和欧洲中期天气预报中心第五代全球气候大气再分析数据(European Centre for Medium-Range Weather Forecasts Reanalysis v5,ERA5),选取2010年以来严重影响浙江的7次台风个例,对台风作用下浙江沿海海面风和浪的演变特点进行分析。结果表明:在台风影响过程中,海浪波型多数呈现混合浪-风浪-混合浪的演变规律;涌浪波型的出现与台风强度及其与浮标站的距离和方位有关,也与海洋潮汐现象紧密相关。台风影响期间,浙江沿海浪高的变化受风速和风向共同作用影响。在风向不变的情况下,持续风速增大对浪高的增大有明显作用;风向的变化也会对浪高变化产生影响,向岸风和离岸风的转变会造成浪高出现剧烈变化。ERA5再分析资料有效波高在台风浪较大时会呈现偏小的趋势,分析订正后的ERA5有效波高发现,台风浪有效波高大值区与台风中心位置相关。研究结果可为严重影响浙江沿海的台风浪预报服务提供参考。

关键词：台风浪海浪波型海洋浮标 ERA5再分析资料

社区护士突发公共卫生事件应急处置胜任力评估工具的系统评价

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中华急危重症护理杂志 2024年第7期5卷 604-610页

作者：翁澳州蒋璐璐衣冉王喜益刘砚燕胡韵上海交通大学护理学院上海市200025

目的对国内外社区护士突发公共卫生事件应急处置胜任力评估工具的方法学质量和测量学特性进行比较、分析及总结,为研究者选择高质量的评估工具提供参考依据。方法系统检索PubMed、Embase、Web ofScience核心数据库、CINAHL、Cochrane、... 详细信息

目的对国内外社区护士突发公共卫生事件应急处置胜任力评估工具的方法学质量和测量学特性进行比较、分析及总结,为研究者选择高质量的评估工具提供参考依据。方法系统检索PubMed、Embase、Web ofScience核心数据库、CINAHL、Cochrane、中国知网、维普数据库、万方数据库、中国生物医学文献数据库9个数据库中有关社区护士突发公共卫生事件应急处置胜任力评估工具测量学特性的文献,检索时限均为建库至2023年11月27日。由2名研究者独立进行文献筛选和资料提取,并以基于共识的健康测量工具选择标准(the consensus-based standards for the selection of health measurement instruments,COSMIN)为指导对纳入评估工具的方法学质量及测量学特性进行分析、比较。结果共纳入10个评估工具,主要包括对社区护士突发公共卫生事件应急处置胜任力的综合评估和专项评估。基于评价结果袁所有评估工具均为B级推荐。结论目前社区护士突发公共卫生事件应急处置胜任力评估工具较为多样,但测评内容差异较大,并且测量学特性均有待进一步验证及完善,未来可考虑以COSMIN指南为指导进行更有针对性的评估工具的开发。

关键词：社区护理突发公共卫生事件胜任力曰评估工具

Numerical Study on Aerodynamic Performance of Mars Parachute Models with Geometric Porosities

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Space(Science & Technology) 2022年第1期2022卷 338-350页

作者： lulu jiang He Jia Xin Xu Wei Rong Wei jiang Qi Wang Gang Chen Xiaopeng Xue Central South University Changsha 410083China Xi’an Jiaotong University Xi’an 710049China Nanjing University of Aeronautics and Astronautics Nanjing 210016China Beijing Institute of Space Mechanics&Electricity Beijing 100076China

The supersonic flows around rigid parachute-like two-body configurations are numerically simulated at Mach number of 1.978 by solving three-dimensional compressible Navier-Stokes equations,where the two-body model consists of a capsule and a canopy,and a geometric structure(i.e.,gap)is located on the canopy *** objective of this study is to investigate the effects of gaps with different porosities and positions on the aerodynamic performance of supersonic *** complicated periodic aerodynamic interactions between the capsule wake and canopy shock occur around these two-body *** the formation of canopy shock and drag coefficient variation,the cycled flow structures can be divided into three types:(1)narrow wake period,(2)open wake period,and(3)middle wake *** addition,it was found that the geometric gaps have no obvious influences on the flow ***,compared with models with different gap positions,the two-body model with an upper gap(gap is close to the canopy vent,UG model)has a smaller drag coefficient fluctuation and better lateral *** the other side,the increase of porosity has a more significant impact on UG models.

关键词： stability surface positions

When smoke meets gut:deciphering the interactions between tobacco smoking and gut microbiota in disease development

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Science China(Life Sciences) 2024年第5期67卷 854-864页

作者： Bo Chen Guangyi Zeng lulu Sun Changtao jiang Center of Basic Medical Research Institute of Medical Innovation and ResearchPeking University Third HospitalBeijing 100191China Department of Physiology and Pathophysiology School of Basic Medical SciencesState Key Laboratory of Vascular Homeostasis and RemodelingPeking UniversityBeijing 100191China Center for Obesity and Metabolic Disease Research School of Basic Medical SciencesPeking UniversityBeijing 100191China State Key Laboratory of Women’s Reproductive Health and Fertility Promotion Peking UniversityBeijing 100191China Department of Endocrinology and Metabolism Peking University Third HospitalBeijing 100191China

Tobacco smoking is a prevalent and detrimental habit practiced worldwide,increasing the risk of various diseases,including chronic obstructive pulmonary disease(COPD),cardiovascular disease,liver disease,and *** previous research has explored the detrimental health effects of tobacco smoking,recent studies suggest that gut microbiota dysbiosis may play a critical role in these *** tobacco smoke components,such as nicotine,are found in the gastrointestinal tract and interact with gut microbiota,leading to lasting impacts on host health and *** review delves into the ways tobacco smoking and its various constituents influence gut microbiota composition and *** also summarize recent advancements in understanding how tobacco smoking-induced gut microbiota dysbiosis affects host ***,this review introduces a novel perspective on how changes in gut microbiota following smoking cessation may contribute to withdrawal syndrome and the degree of health improvements in smokers.

关键词： tobacco smoking gut microbiota dysbiosis nicotine smoking cessation

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岩溶热储古岩溶发育机制与地热水富集模式

中国石油大学学报（自然科学版） 2024年第1期48卷 13-24页

作者：康凤新隋海波李常锁魏善明江露露崔洋山东科技大学地球科学与工程学院山东青岛266590 山东省地质矿产勘查开发局八〇一水文地质工程地质大队山东济南250014 山东省地下水环境保护与修复工程技术研究中心山东济南250014 山东省地热清洁能源探测开发与回灌工程技术研究中心山东德州253072 济南大学水利与环境学院山东济南250022

明晰岩溶储层古岩溶发育机制、形成演化及发育特征对揭示地热资源赋存特征与富集规律具有重要意义。以济南北地热田为例,在厘清奥陶纪马家沟群地层层序及沉积相特征基础上,通过地表岩溶、钻孔揭露地下岩溶发育特征及富水性分布规律的分... 详细信息

明晰岩溶储层古岩溶发育机制、形成演化及发育特征对揭示地热资源赋存特征与富集规律具有重要意义。以济南北地热田为例,在厘清奥陶纪马家沟群地层层序及沉积相特征基础上,通过地表岩溶、钻孔揭露地下岩溶发育特征及富水性分布规律的分析,研究岩溶热储古岩溶作用类型及发育机制,重塑济南北地热田岩溶发育与演化过程并阐明强岩溶发育与地热水富集模式。结果表明:同生岩溶、古风化壳岩溶、埋藏岩溶等三级岩溶发育过程驱动控制区域岩溶的分布层位及发育程度,构造岩溶驱动控制裂隙岩溶发育强度,重力势能驱动控制地热水循环深度和岩溶发育深度;奥陶系顶板以下320 m深度范围内,层间岩溶与构造岩溶复合处、层间岩溶与侵入岩体接触带是强岩溶发育带和地热水富集带。

关键词：奥陶纪马家沟群岩溶热储古风化壳层间岩溶构造岩溶演化过程

Identification of automobile transmission fluid using hyperspectral imaging technology

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International Journal of Agricultural and Biological Engineering 2014年第4期7卷 81-85页

作者： jiang lulu Yu Xinjie He Yong Zhejiang Technology Institute of Economy Hangzhou 310018China Ningbo Institute of Technology Zhejiang UniversityNingbo 315100China College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China

An identification method combining sparse representation with principal component analysis(PCA)was proposed for discriminating varieties of transmission fluid of automobile by using hyperspectral imaging *** component analysis was applied to obtain the characteristic information in the 874-1733 nm *** each transmission fluid variety,80 samples were randomly selected as the training set,and 20 samples as the testing *** eigenvectors of all training samples form the matrix were used for the sparse representation,and the problem of transmission fluid types classification was transformed into one to solve a sample expressed by the overall training sample matrix through optimization under the 11 *** results demonstrate that the accuracy of the algorithm that was composed of sparse representation and principal component analysis(PCA)was 93%.The accuracy is higher than those of PCA-LDA(Linear Discriminant Analysis)and PCA-LS-SVM(Least Squares Support Vector Machine).Therefore,the proposed method provides a better approach for the identification of transmission fluid types.

关键词： transmission fluid hyperspectral image sparse representation principal component analysis identification

Active components of Dengzhan Shengmai ameliorate cognitive impairment by facilitating hippocampal long-term potentiation via the NMDA receptor-mediated Ca^(2+)/CaMKII pathway

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Journal of Pharmaceutical Analysis 2024年第3期14卷 435-438页

作者： Congyu Ma Ning Sheng Jun Wu lulu Wang Jiandong jiang Haibo Yu Jinlan Zhang State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100050China Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing100050China

Abnormal synaptic plasticity causes cognitive *** long-term potentiation(LTP)is a critical synaptic plasticity process[1].Rescuing impaired LTP is challenging;hence,novel agents are required for LTP *** medicine Dengzhan Shengmai(DzSM)has shown notable clinical efficacy against cognitive deficits[2].However,it remains unclear how DzSM modulates *** previous study[3]revealed the influence of DZSM on glutamatergic and GABAergic synapses following chronic cerebral hypoperfusion(CCH),which motivated us to assess how DzSM affects synaptic functions.

关键词： impaired impairment hence

I3:A Self-organising Learning Workflow for Intuitive Integrative Interpretation of Complex Genetic Data

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Genomics, Proteomics & Bioinformatics 2019年第5期17卷 503-510页

作者： Yun Tan lulu jiang Kankan Wang Hai Fang State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China Bristol Renal School of Clinical SciencesUniversity of BristolBristol BS13NYUK Wellcome Centre for Human Genetics University of OxfordOxford OX37BNUK

We propose a computational workflow(I3)for intuitive integrative interpretation of complex genetic data mainly building on the self-organising *** illustrate the use in interpreting genetics of gene expression and understanding genetic regulators of protein phenotypes,particularly in conjunction with information from human population genetics and/or evolutionary history of human *** reveal that loss-of-function intolerant genes tend to be depleted of tissue-sharing genetics of gene expression in brains,and if highly expressed,have broad effects on the protein phenotypes *** suggest that this workflow presents a general solution to the challenge of complex genetic data interpretation.I3 is available at http://***/***.

关键词： Self-organising Human genetics Interpretation Evolution Machine learning