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Mitigate noisy data for smart IoT via GAN based machine unlearning

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Science China(Information Sciences) 2024年第3期67卷 62-78页

作者： Zhuo ma yilong YANG Yang LIU Xinjing LIU Jianfeng ma School of Cyber Engineering Xidian University State Key Laboratory of Integrated Services Networks (ISN)

With the development of IoT applications, machine learning dramatically improves the utility of variable IoT systems such as autonomous driving. Although the pretrain-finetune framework can cope well with data heterogeneity in complex IoT scenarios, the data collected by sensors often contain unexpected noisy data, e.g., out-of-distribution(OOD) data, which leads to the reduced performance of fine-tuned models. To resolve the problem, this paper proposes Mu GAN, a method that can mitigate the side-effect of OOD data via the generative adversarial network(GAN)-based machine unlearning. Mu GAN follows a straightforward but effective idea to mitigate the performance loss caused by OOD data, i.e., “flashbacking” the model to the condition where OOD data are excluded from model training. To achieve the goal, we design an adversarial game, where a discriminator is trained to identify whether a sample belongs to the training set by observing the confidence score. Meanwhile, a generator(i.e., the target model) is updated to fool the discriminator into believing that the OOD data are not included in the training set but others do. The experimental results show that benefiting from the high unlearning rate(more than 90%) and retention rate(99%), Mu GAN succeeds in lowering the model performance degradation caused by OOD data from 5.88% to 0.8%.

关键词： machine unlearning generative adversarial network out of distribution data Internet of Thing neural network

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材料类专业实验室建设与管理探讨

中国现代教育装备 2024年第3期 60-62页

作者：曾文罗现福李春红曹献龙马毅龙重庆科技大学冶金与材料工程学院重庆401331

结合重庆科技大学冶金与材料工程学院的实验室建设现状,分析了实验室存在的主要问题,建立了材料组织结构分析实验室、材料力学性能实验室、材料物理性能实验室和热处理实验室4个公共实验室,采取公共实验室与专业实验室相结合的管理模式... 详细信息

结合重庆科技大学冶金与材料工程学院的实验室建设现状,分析了实验室存在的主要问题,建立了材料组织结构分析实验室、材料力学性能实验室、材料物理性能实验室和热处理实验室4个公共实验室,采取公共实验室与专业实验室相结合的管理模式,提高材料类专业实验室的建设和管理水平。

关键词：材料类专业实验室建设实验室管理

Brain network markers of abnormal cerebral glucose metabolism and blood flow in Parkinson's disease

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Neuroscience Bulletin 2014年第5期30卷 823-837页

作者： Shichun Peng David Eidelberg yilong ma Center for Neurosciences The Feinstein Institute for Medical ResearchNorth Shore-Long Island Jewish Health System

Neuroimaging of cerebral glucose metabolism and blood flow is ideally suited to assay widely-distributed brain circuits as a result of local molecular events and behavioral modulation in the central nervous system. With the progress in novel analytical methodology, this endeavor has succeeded in unraveling the mechanisms underlying a wide spectrum of neurodegenerative diseases. In particular, statistical brain mapping studies have made significant strides in describing the pathophysiology of Parkinson＇s disease （PD） and related disorders by providing signature biomarkers to determine the systemic abnormalities in brain function and evaluate disease progression, therapeutic responses, and clinical correlates in patients. In this article, we review the relevant clinical applications in patients in relation to healthy volunteers with a focus on the generation of unique spatial covariance patterns associated with the motor and cognitive symptoms underlying PD. These characteristic biomarkers can be potentially used not only to improve patient recruitment but also to predict outcomes in clinical trials.

关键词： Parkinson's disease metabolism blood flow PET SPECT movement disorder network analysis imaging biomarkers

The backbone stereochemistry influences the intracellular distribution and uptake mechanism of oligoarginines

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Journal of Innovative Optical Health Sciences 2014年第5期7卷 91-98页

作者： Yan ma Cheng Gong yilong ma Yu-Hui Zhang Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology(HUST)Wuhan 430074 P.R.China MoE Key Laboratory for Biomedical Photonics Department of Biomedical Engineering Huazhong University of Science and TechnologyWuhan 430074 P.R.China Wuhan Blood Center 430030 WuhanP.R.China

D-arginine oligomers have been widely used as intracellular delivery vectors both in in vitro andin vivo ***,their intemalization pathway is obscure and conficting resultshave been obtained concerning their intracellular *** this study,we demonstrate that octa-D-arginine(r:)undergoes diffuse localization throughout the cytoplasm and nucleus even atlow concentrations and that rs(r:D-arginine)enters the cells via direct membrane translocation,unlike R:(R:L-arginine),of which endocytosis is the major internalization *** observation that Rs and rg enter the cells through two clearly distinct internalization pathways suggests that the backbone stereochemistry affects the uptake mechanism of oligoarginines.

关键词： Cell-penetrating peptide oligoarginine heterogeneous mechanism intracellular distribution

Influence of dynamic crystallization on exchange-coupled NdFeB nanocrystalline permanent magnets

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Rare Metals 2006年第Z1期25卷 596-601页

作者： ZHANG Ran LIU Ying ma yilong ZHANG Longfeng XU Jianchuan GAO Shengji Department of material Science and Engineering Sichuan UniversityChengdu 610064China

Dynamic crystallization was introduced to improve the magnetic properties of NdFeB nanocrystalline permanent magnets by optimizing *** microstructure was studied by X-ray diffraction(XRD)and transmission electron microscopy(TEM).It has been determined that,compared with the conventional heat treatment,dynamic crystallization can shorten the crystallization ***,dynamic crystallization can refine grains,enhance the exchange-coupled interaction among grains,and promote the magnetic *** a result,the optimal magnetic properties of Nd_(10.5)(FeCoZr)_(83.4)B_(6.1)(B_(r)=0.685 T,H_(ci)=732 kA·m^(-1),H_(cb)=429 kA·m^(-1),(BH)_(m)=75 kJ·m^(-3))are obtained after dynamic crystallization heat treatment at 700℃for 10 min.

关键词： dynamic crystallization nanocomposite permanent magnets magnetic properties microstructure

基于计算流体力学的配对进近尾流安全间隔研究

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中国安全科学学报 2022年第5期32卷 77-83页

作者：何昕马义龙中国民用航空飞行学院空中交通管理学院四川广汉618307 西南交通大学希望学院轨道交通学院四川成都610400

为解决多变环境条件下通过单纯数学建模方法预测尾流存在精度不足的问题,首先,研究近距平行跑(CSPRs)道配对进近(PA)模式尾流安全区的基本要求;然后,通过建立运输机机翼尾涡流场,采用k-ε模型数值模拟计算侧风影响下的翼尖涡涡量场,得... 详细信息

为解决多变环境条件下通过单纯数学建模方法预测尾流存在精度不足的问题,首先,研究近距平行跑(CSPRs)道配对进近(PA)模式尾流安全区的基本要求;然后,通过建立运输机机翼尾涡流场,采用k-ε模型数值模拟计算侧风影响下的翼尖涡涡量场,得到配对前机尾涡空间分布特征,分析PA尾流安全区,提出基于计算流体力学(CFD)的PA尾流安全间隔计算方法;最后,以上海虹桥机场为例,采用数值模拟方法计算配对前后机分别为B747-400和B737-800,侧风风速3 m/s时的情况,验证该方法的科学性和有效性。结果表明:侧风可以加剧尾流的横向位移,配对后机可在配对前机上风方向跟进飞行避开尾流影响;当飞行环境一定时,前机翼展是PA最大尾流安全间隔值的决定性因素;基于CFD的PA尾流安全间隔计算结果能较好地拟合试验测量值,提高PA尾流安全间隔值的计算精确性;相同配对机型条件下,基于CFD的PA尾流安全间隔计算结果远小于现行尾流间隔标准。

关键词：计算流体力学(CFD) 配对进近(PA) 尾流安全间隔近距平行跑道(CSPRs) 数值仿真

Preparation and magnetic properties of anisotropic Nd2Fe14B/Sm2Co17 hybrid-bonded magnets

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Journal of Rare Earths 2019年第10期37卷 1047-1052页

作者： Xueguo Yin Yue Sui Qiqi Yang Qian Shen yilong ma Bin Shao Jianchun Sun Donglin Guo College of material Science and Engineering Chongqing University of TechnologyChongqing400054China College of Metallurgy and materials Engineering Chongqing University of Science and TechnologyChongqing401331China College of Chemistry and Chemical Engineering Chongqing University of Science and TechnologyChongqing401331China

In the present work, anisotropic Nd2 Fe14 B/Sm2 Co17 hybrid-bonded magnets were prepared with different Nd-Fe-B contents. It is found that the particle distributions and ratios between the two magnetic phases have important roles in the magnetic properties, microstructures and thermal stability of the magnets. With increase of Nd-Fe-B content, the saturation magnetization of the anisotropic hybrid magnet increases significantly, however, coercivity decreases, and the demagnetization curves show magnetically single-phase behavior. The anisotropic Nd2 Fe14 B/Sm2 Co17 hybrid-bonded magnets exhibit a maximum energy product and remanence of 14.15 MGOe and 99.53 A·m2/kg, respectively, when the NdFe-B content is 70 wt% at room temperature. Furthermore, the hybrid magnets also have better thermal stability at elevated temperatures due to the interaction between the two magnetic particles.

关键词： magnetic properties Anisotropic Hybrid-bonded magnets Thermal stability Rare earths

magnetic properties and microstructure of nanocrystalline bulk Nd-Fe-B with Ce-Co addition

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Journal of Rare Earths 2021年第6期39卷 689-695,I0003页

作者： yilong ma Qiqi Yang Xiaoli Chen Ying He Wenbo Xiang Jiaqi Lai Bin Shao Donglin Guo Dengming Chen Kejian Li College of Metallurgy and materials Engineering Chongqing University of Science and TechnologyChongqing 401331China The Center of material Analysis and Testing Chongqing University of Science and TechnologyChongqing 401331China

The influence of Ce-Co alloy addition and sintering holding time on permanent magnetic properties and micro structure of nanocrystalline Nd-Fe-B bulk alloy were *** coercivity of Nd-Fe-B bulk alloy can be enhanced greatly by more than 100% after adding Ce-Co ***,when the concentration of Ce-Co is up to 30 wt%,the density of the magnet can reach the maximum value of 7.58 g/cm^(3),but the coercivity does not increase *** the other hand,with the increase of holding time to 10 min,the density and coercivity of magnets increase gradually,reaching up to 7.55 g/cm^(3) and 1134.3 kA/m,*** the addition of Ce-Co alloy,Ce-Co may easily diffuse into the Nd-Fe-B matrix during hot-pressing and under the high pressure and temperature,thus increasing the content of grain boundary phase and the pinning effect of grain boundary,which leads to the increase of *** extension of the hot-pressing holding time may be more conducive to the diffusion of CeCo into the Nd-Fe-B *** addition,the effect of Ce-Co addition on the magnetic properties of Nd-FeB with different content of rare earth was also *** addition of Ce-Co can effectively increase the coercivity of nanocomposite Nd_(2)Fe_(14)B/α-Fe *** addition of Nb to the parent alloy can further improve the *** Nd_(11)Fe_(81.5)Nb_(1)Ga_(0.5)B_(6) alloy with 10 wt% Ce-Co addition,the coercivity can increase from 740.28 to 1098.48 kA/m.

关键词： Nd-Fe-B magnet Ce-Co addition Coercivity Microstructure Nanocomposite Rare earths

Balloon Angioplasty for Symptomatic Intracranial Artery Stenosis (BASIS): protocol of a prospective, multicentre, randomised, controlled trial

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Stroke & Vascular Neurology 2024年第1期9卷 66-74页

作者： Xuan Sun Ming Yang Dapeng Sun Guangge Peng Yiming Deng Xingquan Zhao Liping Liu Ning ma Feng Gao Dapeng Mo Wengui Yu Yongjun Wang yilong Wang Zhongrong Miao Department of Interventional Neuroradiology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Neurology Beijing Luhe HospitalCapital Medical UniversityBeijingChina Department of Neurology Comprehensive Stroke&Cerebrovascular CenterUniversity of California IrvineIrvineCaliforniaUSA Chinese Institute for Brain Research BeijingChina National Center for Neurological Diseases BeijingChina Advanced Innovation Center for Human Brain Protection Capital Medical UniversityBeijingChina China National Clinical Research Center for Neurological Diseases BeijingChina Beijing Laboratory of Oral Health Capital Medical UniversityBeijingChina

Background The superiority of balloon angioplasty plus aggressive medical management(AMM)to AMM alone for symptomatic intracranial artery stenosis(sICAS)on efficacy and safety profiles still lacks evidence from randomised controlled trials(RCTs).Aim To demonstrate the design of an RCT on balloon angioplasty plus AMM for *** Balloon Angioplasty for Symptomatic Intracranial Artery Stenosis(BASIS)trial is a multicentre,prospective,randomised,open-label,blinded end-point trial to investigate whether balloon angioplasty plus AMM could improve clinical outcome compared with AMM alone in patients with *** eligible in BASIS were 35–80 years old,with a recent transient ischaemic attack within the past 90 days or ischaemic stroke between 14 days and 90 days prior to enrolment due to severe atherosclerotic stenosis(70%–99%)of a major intracranial *** eligible patients were randomly assigned to receive balloon angioplasty plus AMM or AMM alone at a 1:1 *** groups will receive identical AMM,including standard dual antiplatelet therapy for 90 days followed by long-term single antiplatelet therapy,intensive risk factor management and life-style *** participants will be followed up for *** outcomes Stroke or death in the next 30 days after enrolment or after balloon angioplasty procedure of the qualifying lesion during follow-up,or any ischaemic stroke or revascularisation from the qualifying artery after 30 days but before 12 months of enrolment,is the primary *** BASIS trail is the first RCT to compare the efficacy and safety of balloon angioplasty plus AMM to AMM alone in sICAS patients,which may provide an alternative perspective for treating *** registration number NCT03703635;https://***.

关键词： balloon prospective centre