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Path signature-based XAI-enabled network time series classification

Science China(Information Sciences) 2024年第7期67卷 91-106页

作者： le SUN Yueyuan WANG Yongjun REN Feng xia Department of Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Nanjing University of Information Science and Technology School of Computing Technologies Royal Melbourne Institute of Technology

Classifying network time series(NTS) is crucial for automating network administration and ensuring cyberspace security. It enables the detection of anomalies, the identification of network attacks,and the monitoring of performance issues, thereby providing valuable support for network protection and optimization. However, modern communication networks pose challenges for NTS classification *** include handling large-scale and complex NTS data, extracting features from intricate datasets, and addressing explainability requirements. These challenges are particularly pronounced for complex 5G networks. Notably, explainability has become crucial for the widespread deployment of network automation for 5G networks and beyond. To tackle these challenges, we propose a path-signature-based NTS classification model called recurrent signature(Recur Sig). This innovative model is designed to overcome the time-consuming feature selection problem by utilizing deep-learning(DL) techniques. Additionally, it provides a solution for addressing the black-box issue associated with DL models in network automation systems(NAS) by incorporating an explainable classification approach. Extensive experimentation on various public datasets demonstrates that Recur Sig outperforms existing models in accuracy and explainability. The results indicate its potential for application in cyberspace security and automated network management, offering an explainable solution for network protection and optimization.

关键词： network time series classification explainable artificial intelligence path signature automated network management recurrent neural network

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Formation and Evolution of Surface Morphology in Overhang Structure of IN718 Superalloy Fabricated by Laser Powder Bed Fusion

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金属学报:英文版 2023年第9期36卷 1433-1453页

作者： Haotian Zhou Haijun Su Yinuo Guo Yuan Liu Di Zhao Peixin Yang Zhonglin Shen le xia Min Guo State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen518057China

Controlling the overhang surface quality is still a formidable challenge in manufacturing the components with complex structures during laser powder bed fusion(LPBF).This study systematically uncovers the effects of the volume energy density(VED)and overhang angle on the evolution of surface morphology and corresponding surface roughness(Ra)of top and down-skin surfaces of IN718 superalloy *** results show that balling,Plateau-Rayleigh instability,open pore and humping caused by the material stacking are the main factors contributing to the apparent deterioration of top surface *** the VED is 80–100 J/mm^(3),the high down-skin surface roughness is attributed to the serious dross caused by recoil pressure and sinking of the melt *** insufficient VED(15–50 J/mm^(3))can easily lead to poor metallurgical bonding and material spalling on the down-skin *** addition,overhang angle also significantly affects down-skin surface roughness due to the stair effect and the adhered unmelted *** improvement in the surface quality of down-skin surface is observed when the overhang angle *** on the finding of this investigation,an optical VED(59.5 J/mm^(3))significantly improves the top and down-skin surface quality and porosity of overhang *** study provides an insight into synergy ascension of the top and down-skin surface quality in the overhang structure.

关键词： Laser powder bed fusion IN718 superalloy Surface roughness Overhang structure

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The regulatory arbitrage and window dressing in shadow banking:the example of Chinese wealth management product

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Economic and Political Studies 2019年第3期7卷 314-336页

作者： Jinghan Cai Alicia Garcıa-Herrero Fengyun Li xia le Kanis School of Management University of ScrantonScrantonPAUSA Natixis S.A Hong Kong SARChina School of Finance Renmin University of ChinaBeijingChina BBVA Research Hong Kong SARChina

We document that in China the maturity dates of bank-issued wealth management products(WMPs)cluster toward the end of a month and then decrease significantly at the beginning of the following *** empirical work detects a negative relationship between a bank’s loan-to-deposit ratio(LDR)at month-ends and the number of its issued WMPs expiring within several days of the ***,this WMP clustering and the negative relationship disappear after the reform in which regulators bring up measures for banks with a high deposit deviation degree in *** also document that the banks tend to arrange the high-return WMPs to expire around month-ends to attract customers,and this clustering of high-return WMPs also disappears after the *** findings suggest that banks actively,rather than passively,use WMPs as vehicles for their regulatory arbitrage or window dressing behaviours.

关键词： WMP loan-to-deposit ratio regulatory arbitrage window dressing

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Delay-dependent H∞ Control for T-S Fuzzy Systems Based on a Switching Fuzzy Model and Piecewise Lyapunov Function

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自动化学报 2009年第9期35卷 1235-1239页

作者： xia Zhi-le LI Jun-Min School of Science Xidian University Shaanxi Xi'an 710071 P.R. China School of Mathematics and Information Engineering Taizhou University Taizhou 317000 P. R. China

This paper studies the problem of H∞ control for discrete-time Talagi-Sugeno (T-S) fuzzy systems with time *** T-S fuzzy system is transformed to an equivalent switching fuzzy ***,the delay-dependent stabilization criteria with H∞ performance are derived for the switching fuzzy systems based on the piecewise Lyapunov *** proposed conditions are given in terms of linear matrix inequalities (LMIs).The interactions among the fuzzy subsystems are considered in each subregion,and accordingly the proposed conditions are less conservative than the previous ***,a design example is given to show the validity of the proposed method.

关键词：时延模糊系统线性矩阵不等式分段Lyapunov函数

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A modified back analysis method for deep excavation with multi-objective optimization procedure

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1373-1387页

作者： Chenyang Zhao le Chen Pengpeng Ni Wenjun xia Bin Wang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Guangdong Research Center for Underground Space Exploitation Technology School of Civil EngineeringSun Yat-sen UniversityGuangzhou510275China Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Zhuhai519000China Jiangsu Provincial Transportation Engineering Construction Bureau Nanjing210004China

Real-time prediction of excavation-induced displacement of retaining pile during the deep excavation process is crucial for construction *** paper proposes a modified back analysis method with multi-objective optimization procedure,which enables a real-time prediction of horizontal displacement of retaining pile during *** opposed to the traditional stage-by-stage back analysis,time series monitoring data till the current excavation stage are utilized to form a multi-objective ***,the multi-objective particle swarm optimization (MOPSO) algorithm is applied for parameter *** optimized model parameters are immediately adopted to predict the excavation-induced pile deformation in the continuous construction *** achieve efficient parameter optimization and real-time prediction of system behavior,the back propagation neural network (BPNN) is established to substitute the finite element model,which is further implemented together with MOPSO for automatic *** proposed approach is applied in the Taihu tunnel excavation project,where the effectiveness of the method is demonstrated via the comparisons with the site monitoring *** method is reliable with a prediction accuracy of more than 90%.Moreover,different optimization algorithms,including non-dominated sorting genetic algorithm (NSGA-II),Pareto Envelope-based Selection Algorithm II (PESA-II) and MOPSO,are compared,and their influences on the prediction accuracy at different excavation stages are *** results show that MOPSO has the best performance for high dimensional optimization task.

关键词： Multi-objective optimization Back analysis Surrogate model Multi-objective particle swarm optimization(MOPSO) Deep excavation

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What Weapons Does China Have in the Trade War?

What Weapons Does China Have in the Trade War?

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作者： xia le IMI BBVA

The trade war between China and the USA finally broke out on 6 July, when the US imposed25%tariffs on US$34 billion worth of imports from China, to which China responded by applying the same tariff to the value of imports from the US. Subsequently, Trump threatened to apply additional tariffs to all imports from China, close to US$500 billion worth, to which China would not be able to respond, simply because its total imports from the US only amount to some

关键词： What Weapons Does China Have in the Trade War

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Aerobic oxidation of benzylic aldehydes to acids catalyzed by iron (Ⅲ) meso-tetraphenylporphyrin chloride under ambient conditions

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Chinese Chemical letters 2007年第8期18卷 926-928页

作者： xian Tai Zhou Hong Bing Ji Qiu Lan Yuan Jian Chang Xu Li xia Pei le Fu Wang School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 China

Highly efficient aerobic oxidation of benzylic aldehydes to the corresponding acids catalyzed by iron （Ⅲ） meso-tetrapbenylporphyrin chloride （Fe（TPP）Cl） under ambient conditions was developed. The catalyst has been proved to be an excellent catalyst for the system in the presence of molecular oxygen and isobutryaldehyde at room temperature.

关键词： Benzylic aldehydes Oxidation Metalloporphyrins

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Effects of potassium deficiency on photosynthesis,chloroplast ultrastructure,ROS,and antioxidant activities in maize(Zea mays L.)

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Journal of Integrative Agriculture 2019年第2期18卷 395-406页

作者： DU Qi ZHAO Xin-hua xia le JIANG Chun-ji WANG xiao-guang HAN Yi WANG Jing YU Hai-qiu College of Agronomy Shenyang Agricultural UniversityShenyang 110866P.R.China Bureau of Liaoning Provincial Seed Management Shenyang 110034P.R.China

Potassium(K)deficiency significantly decreases photosynthesis due to leaf chlorosis induced by accumulation of reactive oxygen species(ROS).But,the physiological mechanism for adjusting antioxidative defense system to protect leaf function in maize(Zea mays L.)is *** the present study,four maize inbred lines(K-tolerant,90-21-3 and 099;K-sensitive,D937 and 835)were used to analyze leaf photosynthesis,anatomical structure,chloroplast ultrastructure,ROS,and antioxidant *** results showed that the chlorophyll content,net photosynthetic rate(P_n),stomatal conductance(G_s),photochemical quenching(q_P),and electron transport rate of PSII(ETR)in 90-21-3 and 099 were higher than those in D937 and 835 under K deficiency *** of leaf anatomical structure in D937 that were significantly changed under K deficiency treatment include smaller thickness of leaf,lower epidermis cells,and vascular bundle area,whereas the vascular bundle area,xylem vessel number,and area in 90-21-3 were significantly larger or higher.D937 also had seriously damaged chloroplasts and PSII reaction centers along with increased superoxide anion(O_2^-·)and hydrogen peroxide(H_2O_2).Activities of antioxidants,like superoxide dismutase(SOD),catalase(CAT),and ascorbate peroxidase(APX),were significantly stimulated in 90-21-3 resulting in lower levels of O_2^-·and H_2O_*** results indicated that the K-tolerant maize promoted antioxidant enzyme activities to maintain ROS homeostasis and suffered less oxidative damage on the photosynthetic apparatus,thereby maintaining regular photosynthesis under K deficiency stress.

关键词： potassium deficiency maize photosynthesis chloroplast ultrastructure ROS and antioxidant

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Colorful Cause Geared to Help Develop Tibet

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China's Tibet 1995年第6期6卷 4-9页

作者： ZHI xia,YONG le

ＣｏｌｏｒｆｕｌＣａｕｓｅＧｅａｒｅｄｔｏＨｅｌｐＤｅｖｅｌｏｐＴｉｂｅｔＺＨＩＸＩＡ，ＹＯＮＧＬＥＩｎｔｈｅｇｏｌｄｅｎａｕｔｕｍｎｍｏｎｔｈｏｆＡｕｇｕｓｔ，ＬｉＲｕｉｈｕａｎ，ｃｈａｉｒｍａｎｏｆｔｈｅＣｈｉｎ... 详细信息

ＣｏｌｏｒｆｕｌＣａｕｓｅＧｅａｒｅｄｔｏＨｅｌｐＤｅｖｅｌｏｐＴｉｂｅｔＺＨＩＸＩＡ，ＹＯＮＧＬＥＩｎｔｈｅｇｏｌｄｅｎａｕｔｕｍｎｍｏｎｔｈｏｆＡｕｇｕｓｔ，ＬｉＲｕｉｈｕａｎ，ｃｈａｉｒｍａｎｏｆｔｈｅＣｈｉｎｅｓｅＰｅｏｐｌｅ＇ｓＰｏｌｉｔｉ...

关键词： Colorful Cause Geared to Help Develop Tibet

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Quantum squeezing induced nonreciprocal phonon laser

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 20-30页

作者： Tian-xiang Lu Yan Wang Keyu xia Xing xiao le-Man Kuang Hui Jing College of Physics and Electronic Information Gannan Normal UniversityGanzhou 341000China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Academy for Quantum Science and Technology Zhengzhou University of Light IndustryZhengzhou 450002China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Phonon lasers or coherent amplifications of mechanical oscillations are powerful tools for fundamental studies on coherent acoustics and hold potential for diverse applications,ranging from ultrasensitive force sensing to phononic information ***,we propose the use of an optomechanical resonator coupled to a nonlinear optical resonator for directional phonon *** find that by pumping the nonlinear optical resonator,directional optical squeezing can occur along the pump *** a result,we can achieve the directional mechanical gain using directional optical squeezing,thereby leading to nonreciprocal phonon lasing with a well-tunable directional power *** work proposes a feasible way to build nonreciprocal phonon lasers with various nonlinear optical media,which are important for a wide range of applications,such as directional acoustic amplifiers,invisible sound sensing or imaging,and one-way phononic networks.

关键词： nonreciprocal phonon laser directional quantum squeezing optomechanics

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