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practical autoencoder based anomaly detection by using vector reconstruction error

Cybersecurity 2023年第2期6卷 1-13页

作者： Hasan Torabi Seyedeh Leili Mirtaheri Sergio Greco Department of Electrical and Computer Engineering Faculty of EngineeringKharazmi UniversityTehranIran Department of Informatics ModelingElectronics and System EngineeringUniversity of CalabriaArcavacataItaly.

Nowadays,cloud computing provides easy access to a set of variable and configurable computing resources based on user demand through the network.Cloud computing services are available through common internet protocols and network standards.n addition to the unique benefits of cloud computing,insecure communication and attacks on cloud networks cannot be ignored.There are several techniques for dealing with network attacks.To this end,network anomaly detection systems are widely used as an effective countermeasure against network anomalies.The anomaly-based approach generally learns normal traffic patterns in various ways and identifies patterns of anomalies.Network anomaly detection systems have gained much attention in intelligently monitoring network traffic using machine learning methods.This paper presents an efficient model based on autoencoders for anomaly detection in cloud computing networks.The autoencoder learns a basic representation of the normal data and its reconstruction with minimum error.Therefore,the reconstruction error is used as an anomaly or classification metric.In addition,to detecting anomaly data from normal data,the classification of anomaly types has also been investigated.We have proposed a new approach by examining an autoencoder's anomaly detection method based on data reconstruction error.Unlike the existing autoencoder-based anomaly detection techniques that consider the reconstruction error of all input features as a single value,we assume that the reconstruction error is a vector.This enables our model to use the reconstruction error of every input feature as an anomaly or classification metric.We further propose a multi-class classification structure to classify the anomalies.We use the CIDDS-001 dataset as a commonly accepted dataset in the literature.Our evaluations show that the performance of the proposed method has improved considerably compared to the existing ones in terms of accuracy,recall,false-positive rate,and F1-score metrics.

关键词： Cloud practical Anomaly detection Autoencoder Reconstruction error Machine learning

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Correction to:practical framework for data-driven RANS modeling with data augmentation

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Acta Mechanica Sinica 2021年第12期37卷 1840-1842页

作者： Xianwen Guo Zhenhua Xia Shiyi Chen State Key Laboratory for Turbulence and Complex Systems College of EngineeringPeking UniversityBeijing 100871China Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055China

Correction to:Acta Mechanica Sinica(2021)37(12):1750-1758 https://***/10.1007/s10409-021-01147-2 In the original publication,the last equation in Eq.(8)should be.

关键词： practical Correction modeling

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General, practical, and accurate models for the performance analysis of cache cascades

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Science China(Information Sciences) 2017年第4期60卷 244-246页

作者： Haoqiu HUANG Lanlan RUI Weiwei ZHENG Danmei NIU Xuesong QIU State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications

Dear editor,Owing to the significant benefits generated by caching in Content Delivery Networks(CDN)and Information-Centric Networking(ICN),the performance analysis of multi-cache systems has received renewed interest by the networking research community[1–5].To analyze the performance(i.e.,cache hit probability),Melazzi et al.[3]proposed an approximate approach that uses

关键词： and accurate models for the performance analysis of cache cascades practical General

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practical φ_0-stability of stochastic differential equations and corresponding stochastic perturbation theory

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中南大学学报（自然科学版） 2009年第S1期40卷 235-238页

作者：赵平康宇宗西举 School of Control Science and Engineering University of Jinan Department of Automation University of Science and Technology of China

The notions of practical φ0-stability were introduced for stochastic differential equations. Sufficient conditions on such practical properties were obtained by using the comparison principle and the cone-valued Lyapunov function methods. Based on an extended comparison theorem, a perturbation theory of stochastic differential systems was given.

关键词： practical φ 0-stability stochastic differential equation comparison principle perturbation theory

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practical Teaching Strategies in Ideological and Political Theory Courses

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Journal of Contemporary Educational Research 2019年第6期3卷 23-26页

作者： Yandi Li School of Marxism Guangdong Neusoft InstituteFoshanGuangdong528225China

In the context of the accelerated process of educational reform,the practical teaching activities of ideological and political theory courses need to be further adjusted and optimized,and the effectiveness of practical teaching needs to be further improved.Through the analysis of the practical teaching situation of some schools’ideological and political theory courses,it was found that there are many specific problems in the teaching of ideological and political theory courses.When the related problems persist for a long time and cannot be effectively solved,the overall teaching situation of ideological and political theory courses is unsatisfactory.This paper will analyze the problems existing in the practical teaching of ideological and political theory courses and put forward reasonable suggestions on how to better implement the corresponding practical teaching.

关键词： Ideological politics Theoretical class practical teaching

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Treatment of practical Dye Wastewater Using a Double Dielectric Barrier Discharge System Combined with a Sequencing Batch Reactor System

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Journal of Donghua University(English Edition) 2015年第5期32卷 715-719页

作者：孙玉刘亚男薛罡高品李攀 School of Environmental Science and Engineering Donghua University School of Environmental Science and Engineering State Key Laboratory of Control and Resource Reuse Tongji University

Synthetic dyes are substances that are relatively stable and difficult to degrade in wastewater treatment plants using normal physical,chemical or / and biological treatment. The present work explored the synergistic effect of non-thermal plasma( NTP) and biological wastewater treatment technologies on practical dye wastewater degradation by establishing a double dielectric barrier discharge( DDBD) system combined with a sequencing batch reactor( SBR) system. The biodegradation and degradation efficiency of the DDBD-SBR system was investigated. The investigation results indicated that the DDBD technology was effective in treating the practical dye wastewater as a pre-treatment process. After a 10-min treatment,although the total organic carbon( TOC) removal efficiency was not so significant, the decolouration and the biodegradation were improved greatly. The microbial toxicity test revealed that the sample after degradation became less toxic than the original dye,which demonstrated the treatment had a significant effect on the reduction of toxicity. In addition,the SBR technology remedied the defects of DDBD treatment and improved TOC removal efficiency noticeably. The hybrid DDBD-SBR system made full use of the advantages of the individual technologies and exhibited an efficient capability for practical dye wastewater treatment.

关键词： practical dye wastewater decolouration biodegradation hybrid double dielectric barrier discharge-sequencing batch reactor(DDBD-SBR) system

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Rational Design of Layered SnS2 on Ultralight Graphene Fiber Fabrics as Binder-Free Anodes for Enhanced practical Capacity of Sodium-Ion Batteries

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Nano-Micro Letters 2019年第4期11卷 173-184页

作者： Zongling Ren Jie Wen Wei Liu Xiaoping Jiang Yanheng Dong Xiaolong Guo Qiannan Zhao Guipeng Ji Ronghua Wang Ning Hu Baihua Qu Chaohe Xu College of Aerospace Engineering The State Key Laboratory of Mechanical TransmissionsChongqing UniversityChongqing 400044People’s Republic of China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005People’s Republic of China College of Materials Science and Engineering Chongqing UniversityChongqing 400044People’s Republic of China MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials and Devices Joint LaboratoryChongqing UniversityChongqing 400044People’s Republic of China

Generally,the practical capacity of an electrode should include the weight of non-active components such as current collector,polymer binder,and conductive additives,which were as high as 70 wt%in current reported works,seriously limiting the practical capacity.This work pioneered the usage of ultralight reduced graphene fiber(rGF)fabrics as conductive scaffolds,aiming to reduce the weight of nonactive components and enhance the practical capacity.Ultrathin SnS2 nanosheets/rGF hybrids were prepared and used as binder-free electrodes of sodium-ion batteries(SIBs).The interfused graphene fibers endow the electrode a porous,continuous,and conductive network.The in situ phase transformation from SnO2 to SnS2 could preserve the strong interfacial interactions between SnS2 and graphene.Benefitting from these,the designed binder-free electrode delivers a high specific capacity of 500 mAh g?1 after 500 cycles at a current rate of 0.5 A g?1 with almost 100%Coulombic efficiency.Furthermore,the weight percentage of SnS2 in the whole electrode could reach up to 67.2 wt%,much higher than that of common electrode configurations using Cu foil,Al foil,or carbon cloth,significantly highlighting the ultralight characters and advantages of the rGF fabrics for using as binder-free electrodes of SIBs.

关键词： SnS2 Graphene fiber fabric Binder-free electrode practical capacity Sodium-ion batteries

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Finite-Key Analysis for a practical High-Dimensional Quantum Key Distribution System Based on Time-Phase States

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Chinese Physics Letters 2019年第4期36卷 5-9页

作者：甘亚辉汪洋鲍皖苏何如适周淳江木生 Henan Key Laboratory of Quantum Information and Cryptography Zhengzhou Information Science and Technology Institute Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China

High-dimensional quantum states key distribution(HD-QKD) can enable more than one bit per photon and tolerate more noise. Recently, a practical HD-QKD system based on time-phase states has provided a secret key at Mbps over metropolitan distances. For the purposes of further improving the secret key rate of a practical HD-QKD system, we make two main contributions in this work. Firstly, we present an improved parameter estimation for this system in the finite-key scenario based on the Chernoff bound and the improved Chernoff bound. Secondly, we analyze how the dimension d affects the performance of the practical HD-QKD system.We present numerical simulations about the secret key rate of the practical HD-QKD system based on different parameter estimation methods. It is found that using the improved Chernoff bound can improve the secret key rate and maximum channel loss of the practical HD-QKD system. In addition, a mixture of the 4-level and 8-level practical HD-QKD system can provide better performance in terms of the key generation rate over metropolitan distances.

关键词： High-dimensional quantum states key distribution contributions practical

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practical Principles and Ways of Undergraduates’ ideological and moral education in university

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International Journal of Technology Management 2016年第5期 44-46页

作者： Zhou Hongsheng NanJingXiaoZhuang University Nanjing Jiangsu Province 211171

The important target audiences of the college ideological and political education are the undergraduates. Anyone who works on the college ideological and political education has to learn the basic features of the development of the undergraduates’ moral qualities as well as the counseling principle, the optimism principle, the democratic principle and the encouraging principle. The college applied the means of traditional moral education to enhance undergraduates’ understanding of morality, gave topics on morality for undergraduates to increase their judgments on moral issues, praised the moral model undergraduates who served as a role model for the undergraduates, and offered the literary and artistic works for reading to trigger the emotional response of undergraduates. The undergraduates will have a better ideological understanding and seek new heights of self-cultivation during their moral practice.

关键词： undergraduates ideological and moral education practical principles ways

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practical Student-centered Activities of Communicative Language Teaching——Unit 2 Text A :Animals(21st Century College English Book II)

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海外英语 2015年第4期 113-115页

作者：孙丽敏冯敏敏西安欧亚学院通识教育学院外国语言课程中心

English plays a very important role in our daily life and has been a world language for decades, as the global economy is developing so fast nowadays, the learners of English have already realized that the main purpose to learn English is to communicate properly in their real life with the people from other culture, but not to memorize those boring grammar rules and terrible vocabularies which will appear in their English examinations. Consequently, it has become an important task for English teachers to think about how to develop students' language abilities for real communication. Nowadays, Communicative Language Teaching(CLT) has become a very popular teaching approach in China. CLT pays a lot attention to the social and functional elements in language daily use.

关键词： Communicative Language Teaching(CLT) communicative competence practical activities

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