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Adaptive in-page logging for flash-memory storage systems

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Frontiers of Computer Science 2014年第1期8卷 131-144页

作者： Ke lu School of Computer Science and Technology University of Science and Technology of China Hefei 230026 China Key Laboratory of Electromagnetic Space Information Chinese Academy of Sciences Hefei 230026 China

Flash memory is widely used in embedded de- vices and enterprise storage systems. Currently, flash-based storage devices usually use a flash translation layer （FFL） to cope with the special features of flash memory. Many meth- ods for the design and implementation of the FTL have been proposed, such as BAST （block-associative sector transla- tion）, FAST （fully associative sector translation）, and IPL （in- page logging）, of which IPL has been demonstrated to have the best performance. However, IPL offers little considera- tion to reducing merge operations that consequently result in the degradation of the overall performance of flash-memory storage systems. We propose an improvement to IPL, called adaptive IPL （AIPL）. The idea of adaptive IPL is to make the log region in a block resizable, therefore a hot block （i.e., a write-intensive block） will use a large log region so as to absorb more page updates and in turn reduce the merge op- erations, while a cold block, i.e., a block rarely written to, will use a small log region. This is realized by first detecting the update pattern of a block and then presenting an update- pattern-based algorithm to dynamically adjust the log region size of a newly allocated block. We conduct experiments on TPC-C traces and synthetic traces and compare the perfor- mance of AIPL with other competitors in terms of merge count, write count and elapsed time. The results demonstrate that compared with IPL, AIPL can reduce merge operations by 65% and write operations by 54% on average.

关键词： flash memory adaptive algorithm IPL updatepattern

Unconditional Uniqueness of Solution for Hsc Critical 4th Order NLS in High Dimensions

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Acta Mathematica Sinica,English Series 2018年第6期34卷 1028-1036页

作者： Chao lu Jing lu The Graduate School of China Academy of Engineering Physics P. O. Box 2101 Beijing 100088 P. R. China School of Mathematical Sciences Beijing Normal University Beijing 100875 P. R. China

In this paper, we study the unconditional uniqueness of solution for the Cauchy problem of H^·^Sc（0≤Sc〈2） critical nonlinear fourth-order Schrodinger equations iδtu＋Δ^2u-εu=λ｜u｜^α*** employing paraproduct estimates and Strichartz estimates, we prove that unconditional uniqueness of solution holds in Ct（I;H^·^Sc（R^d）））for d≥11 and min {1^-,8/d-4}≥a〉-（d-4）＋√（d-4）^2＋64/4.

关键词： Unconditional uniqueness paraproduct estimates Besov spaces fourth order nonlinear Schrodinger equation

Versatile Ti_(3)C_(2)T_(x)MXene for free-radical scavenging

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Nano Research 2022年第3期15卷 2558-2566页

作者： Jiang Liu Wei lu Xifeng lu lu Zhang Haifeng Dong Yingchun Li Flexible Printed Electronics Technology Center and School of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Department of Physiology Health Science CenterShenzhen UniversityShenzhen 518055China Marshall Laboratory of Biomedical Engineering Research Center for Biosensor and NanotheranosticSchool of Biomedical EngineeringShenzhen UniversityShenzhen 518055China

MXene,as an emerging two-dimensional(2D)material with ultrathin structure and fascinating physiochemical properties,has been widely explored in broad *** functions of MXenes are continuously *** work presents distinctive feature of MXene-Ti_(3)C_(2)T_(x)nanosheets for free-radical(FRs)scavenging that never reported *** demonstrated the mechanism and equation in regard to the reaction between Ti_(3)C_(2)T_(x)and H_(2)O_(2),which was applied to design colorimetric H_(2)O_(2)strip assay with good *** good FRs scavenging capability of Ti_(3)C_(2)T_(x),including a series of reactive oxygen species(ROS)and reactive nitrogen species(RNS),was systemically *** antioxidation capability of Ti_(3)C_(2)T_(x)for protecting cells from oxidative damage was demonstrated using the oxidative damage model of alpha mouse liver 12(AML-12)*** original work provides huge opportunities for MXenes in FR-related biomedical applications.

关键词： MXene hydrogen peroxide colorimetric sensor reactive oxygen species anti-oxidative damage

Degeneration Versus Development: Hunting-Out the D-Unit of Huntington's Disease

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Neuroscience Bulletin 2021年第5期37卷 757-760页

作者： Shengyi lu Boxun lu State Key Laboratory of Medical Neurobiology and Ministry of Education Frontiers Center for Brain Science School of Life SciencesFudan UniversityShanghai 200032China

Huntington’s disease (HD) is an autosomal dominant neurodegenerative disorder caused by a CAG trinucleotide repeat expansion exceeding a threshold length (>35repeats) in exon 1 of the huntingtin gene (HTT)[1]. The age at onset is typically 40–50 years, except for a very low percentage (approximately 6%) of juvenile-onset HD patients carrying 75 or more CAG repeats;longer CAG repeats predict an earlier onset [1].

关键词： Huntington exceeding typically

陈旧性骨质疏松性椎体压缩骨折骨不连的修复策略:一项病例分析

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中国组织工程研究 2025年第3期29卷 538-546页

作者：赵星丞王军陆明上海市公共卫生临床中心骨科上海市201508

背景:腰椎骨质疏松性压缩性骨折患者的脊柱和骨盆矢状位参数存在不同程度改变,将导致全脊柱/腰椎矢状面发生失平衡和再平衡。如果初次骨质疏松性椎体压缩骨折没有得到及时治疗,随着时间的推移将发展为陈旧性骨质疏松性椎体压缩骨折骨不... 详细信息

背景:腰椎骨质疏松性压缩性骨折患者的脊柱和骨盆矢状位参数存在不同程度改变,将导致全脊柱/腰椎矢状面发生失平衡和再平衡。如果初次骨质疏松性椎体压缩骨折没有得到及时治疗,随着时间的推移将发展为陈旧性骨质疏松性椎体压缩骨折骨不连。目的:观察陈旧性骨质疏松性腰椎体压缩骨折骨不连9例患者行经皮椎体成形(PVP)术后的修复效果。方法:回顾性分析2018年9月至2022年8月上海市公共卫生临床中心骨科收治的陈旧性老年骨质疏松性腰椎椎体压缩性骨折骨不连经皮椎体成形术后术椎再骨折患者9例的临床资料,所有患者均采用经皮椎体成形行再翻修治疗,同时规律进行抗骨质疏松治疗和康复训练。出院前及随访时复查患者的腰椎X射线平片及三维CT检测结果,评价骨水泥弥散情况,记录患者术前、术后、随访时的目测类比评分、腰椎Oswetry功能障碍指数(ODI评分)及Roussouly腰椎功能分型变化。结果与结论:①9例患者术后随访时均未发生神经损伤、感染、骨水泥椎管内渗漏、肺栓塞及过敏性休克等严重手术并发症,均未发生骨水泥相关的不良反应。有1例患者术后2年感染COVID-19致呼吸功能衰竭死亡。②术椎再骨折患者术后疼痛目测类比评分和ODI评分均显著低于翻修术前,末次随访经皮椎体成形翻修术后患者Roussouly腰椎功能分型显著改善;末次随访测量术椎椎体高度变化与术前比较无显著性意义。③上述结果提示,对陈旧性骨质疏松性腰椎体压缩骨折骨不连行经皮椎体成形治疗的患者而言,适量骨水泥注入和有效骨水泥弥散具有明显缓解术后疼痛作用,规律抗骨质疏松和术后有效康复训练有助于患者术后腰椎功能恢复。

关键词：骨质疏松经皮椎体成形骨水泥注入技术椎体成形术椎再骨折 Roussouly腰椎功能分型应力集中区

N,S-codoped porous carbon nanosheets decorated with Fe_(3)C nanoparticles as high-performance anode materials for lithium ion hybrid supercapacitors

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Rare Metals 2022年第7期41卷 2517-2526页

作者： Lin Gao lu-lu Zhang Xue-Lin Yang College of Electrical Engineering&New Energy Hubei Collaborative Innovation Center for Microgrid of New EnergyThree Gorges UniversityYichang 443002China

The practical applications of carbon anode for lithium-ion batteries(LIBs)are largely obstructed by their moderate rate capability and cyclic ***,we report a N,S-codoped porous carbon nanosheet(NSC)decorated with Fe_(3)C nanoparticles(Fe_(3)C/NSC)by a one-pot pyrolysis *** high surface area and abundant defects of NSC can not only promote electrons and ions transfer,but also induce high pseudocapacitive *** importantly,the synergistic catalysis effect of Fe-Nx and Fe_(3)C can catalyze the reversible conversion of some solid electrolyte interface(SEI)components to offer excess capacity during *** expected,the Fe_(3)C-NSC anode delivers a discharge capacity of750 mAh·g^(-1)under a current density of 0.5 A·g^(-1)through 500 cycles and retains a dis-charge capacity of 366 mAh·g^(-1)at 4 A·g^(-1)after 1600 cycles,*** importantly,the lithium-ion capacitors based on Fe_(3)C/NSC anode demonstrate a high energy density of 249.5 Wh·kg^(-1)at 560 W·kg^(-1).

关键词： Fe_(3)C/NSC Lithium-ion batteries Pseudocapacitive behavior Lithium-ion capacitors

STRUCTURE MODEL OF GLASSES FOR PbO-Bi₂O₃-B₂O₃ SYSTEM CONTAINING HIGHER B₂O₃

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中国有色金属学会会刊：英文版 1997年第2期7卷 142-145页

作者： lu, Anxian Huang, Jiwu lu, Renwei Central South Univ of Technology Changsha China

ＳＴＲＵＣＴＵＲＥＭＯＤＥＬＯＦＧＬＡＳＳＥＳＦＯＲＰｂＯＢｉ２Ｏ３Ｂ２Ｏ３ＳＹＳＴＥＭＣＯＮＴＡＩＮＩＮＧＨＩＧＨＥＲＢ２Ｏ３①ＬｕＡｎｘｉａｎ，ＨｕａｎｇＪｉｗｕ，ＬｕＲｅｎｗｅｉＤｅｐａｒｔｍｅｎｔｏｆＭａ... 详细信息

ＳＴＲＵＣＴＵＲＥＭＯＤＥＬＯＦＧＬＡＳＳＥＳＦＯＲＰｂＯＢｉ２Ｏ３Ｂ２Ｏ３ＳＹＳＴＥＭＣＯＮＴＡＩＮＩＮＧＨＩＧＨＥＲＢ２Ｏ３①ＬｕＡｎｘｉａｎ，ＨｕａｎｇＪｉｗｕ，ＬｕＲｅｎｗｅｉＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄ...

关键词： matted crystal glass structure model boron oxygen ring

Noise attenuation of frequency-modulated multi-rotor using sound field reproduction

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Chinese Journal of Aeronautics 2023年第11期36卷 185-203页

作者： Xice XU Yang lu Mengxue SHAO Jiaxin lu National Key Laboratory of Rotorcraft Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Multi-rotor aircraft has great potential in urban traffic and military use and its noise problem has attracted more attention ***-rotor aircrafts are typically controlled by changing the rotation speeds of the *** reduce the noise of multiple frequency-modulated rotors,a global noise attenuation method is proposed in this ***,the fast prediction method is used to estimate the global noise of the multirotor with different configurations ***,the sound field reproduction method is used to obtain the control signal of the loudspeaker array to achieve global noise ***,the influence of array arrangement on noise reduction is analyzed in the acoustic modal domain,which reveals that different optimization models are needed to minimize the noise power or/and the noise pressure in some directions when the scale of the array is ***,to improve the real-time performance of the system,the online calculation of the optimal control signal is transformed into the offline design of the optimal filter,which satisfies the target frequency-domain ***,the experimental results of the noise of a model quadrotor in the anechoic chamber were consistent with the predicted *** simulation results of noise attenuation for the quadrotor show that the method proposed reduced the global noise power by about 13 ***,the noise region radiated from the quadrotor to the ground with the boundary of 40 dB was reduced to 8.4%of that before control.

关键词： Acoustic modal analysis Frequency-modulated multirotor Noise attenuation Optimal filter design Sound reproduction

High-efficiency prediction method for helicopter global/ground noise based on near-field acoustic holography

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Chinese Journal of Aeronautics 2024年第7期37卷 271-284页

作者： Mengxue SHAO Yang lu Xice XU Jiaxin lu National Key Laboratory of Helicopter Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Noise reduction program design is an effective approach that relies on efficient noise prediction for reducing ground noise during *** existing noise prediction methods have the limitations of being computationally expensive or only applicable to *** this paper,a High-Efficiency Prediction Method(HEPM)for helicopter global/ground noise based on near-field acoustic holography is *** HEPM can predict the global noise based on acoustic modal analysis and has the advantages of high prediction accuracy and low time *** process is given as follows:firstly,the rotor noise on the holographic surface in the specified flight is obtained by simulations or ***,the global noise model,which maps time-domain noise to acoustic modes,is established based on near-field acoustic holography and Fourier acoustic analysis ***,combined with acoustic modal amplitude,the model established enables efficiently predicting the global/ground noise in the corresponding flight *** verify the accuracy of the prediction method,a simulation study is conducted in hovering and forward flight states using a model helicopter with a 2-meter rotor and Rotor Body Interaction(ROBIN)*** comparison of HEPM with numerical results shows that the average prediction errors of the global and ground noise are less than 0.3 dB and 0.2 dB,*** a region containing 100000 observers,the computation time of the HEPM is only one-fifth of that of the acoustic hemisphere method,demonstrating the rapidity of the proposed method.

关键词： Helicopter Rotor noise prediction Noise abatement procedure design Acoustic modal analysis Near-field acoustic holography