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UAV-assisted cooperative offloading energy efficiency system for mobile edge computing

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Digital Communications and Networks 2024年第1期10卷 16-24页

作者： Xue-Yong Yu wen-Jin Niu Ye zhu Hong-Bo zhu Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications Nanjing210003China Engineering Research Centerof Health Service System Based on Ubiquitous Wireless Networks Ministry of EducationNanjng Universityof Posts and Telecommunications Nanjing210003China

Reliable communication and intensive computing power cannot be provided effectively by temporary hot spots in disaster areas and complex terrain ground *** this has greatly developed the application and integration of UAV and Mobile Edge Computing(MEC)to the Internet of Things(loT).However,problems such as multi-user and huge data flow in large areas,which contradict the reality that a single UAV is constrained by limited computing power,still *** to allowing UAV collaboration to accomplish complex tasks,cooperative task offloading between multiple UAVs must meet the interdependence of tasks and realize parallel processing,which reduces the computing power consumption and endurance pressure of *** the computing requirements of the user terminal,delay constraint of a computing task,energy constraint,and safe distance of UAV,we constructed a UAV-Assisted cooperative offloading energy efficiency system for mobile edge computing to minimize user terminal energy ***,the resulting optimization problem is originally nonconvex and thus,difficult to solve *** tackle this problem,we developed an energy efficiency optimization algorithm using Block Coordinate Descent(BCD)that decomposes the problem into three convex ***,we jointly optimized the number of local computing tasks,number of computing offloaded tasks,trajectories of UAV,and offloading matching relationship between multi-UAVs and multiuser *** results show that the proposed approach is suitable for different channel conditions and significantly saves the user terminal energy consumption compared with other benchmark schemes.

关键词： Computation offloading Internet of things(IoT) Mobile edge computing(MEC) Block coordinate descent(BCD)

Estimating Restricted Common Structural Changes for Panel Data

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Acta Mathematicae Applicatae Sinica 2019年第4期35卷 893-908页

作者： Li-wen ZHANG Zhong-yi zhu School of Statistics and Management Shanghai University of Finance and Economics Shanghai 200444 China Department of Statistics School of Management Fudan University Shanghai 200433 China

We consider estimating multiple structural changes occurring at unknown common dates in a panel data regression model with restrictions imposed on the coefficients. We establish the consistency and rate of convergence of the structural change estimates and the asymptotic distribution of the parameter *** is shown that the efficiency of the parameter estimators is increased using the restrictions. An efficient dynamic algorithm is proposed to obtain the break date estimates and the parameter estimates. In addition, we propose a testing procedure for the existence of the change points with the restrictions and derive the asymptotic distribution under the null hypothesis of the test statistics. Simulation studies are presented to investigate the performance of the proposed method in finite samples.

关键词： common structural changes panel data consistency

Hyperbranched Polyurethane Acrylate Applied to UV Curable Flame Retardant Coatings

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Chemical Research in Chinese Universities 2001年第3期17卷 331-333页

作者： zhu Sheng-Wu SHI wen-Fang State Key Laboratory of Fire Science Department of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026P.R.China

UV curable hyperbranched prepolymers based on amine-ester, ester-amide and ether-amide started with AB_2-type monomers have been prepared by the authors. A series of work on allyl ether maleate hyperbranched polyesters for UV curing coatings by Hult and his colleagues has been reported. However, the UV cured films from those materials are all flammable when attached to fire without addition of flame retardants.

关键词： Flame retardant Polyurethane acrylate Phosphorus UV curing

Design of Fault Detection Observer Based on Hyper Basis Function

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Tsinghua Science and Technology 2015年第2期20卷 200-204页

作者： Xin wen Xingwang Zhang Yaping zhu Faculty of Aerospace Engineering Shenyang Aerospace University College Astronautics Nanjing University of Aeronautics and Astronautics College Astronautics Nanjing University of Aeronautics and Astronautics

In this paper, we propose the Hyper Basis Function （HBF） neural network on the basis of Radial Basis Function （RBF） neural network. Compared with RBF, HBF neural networks have a more generalized ability with different activation functions. A decision tree algorithm is used to determine the network center. Subsequently, we design an adaptive observer based on HBF neural networks and propose a fault detection and diagnosis method based on the observer for the nonlinear modeling ability of the neural network. Finally, we apply this method to nonlinear systems. The sensitivity and stability of the observer for the failure of the nonlinear systems are proved by simulation, which is beneficial for real-time online fault detection and diagnosis.

关键词： observer fault detection hyper basis function neural networks

Influencing factors for hepatic fat accumulation in patients with type 2 diabetes mellitus

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World Journal of Clinical Cases 2021年第26期9卷 7717-7728页

作者： Meng-Jiao Wu Qiong-Lei Fang Sheng-Yi Zou Yan zhu wen Lu Xuan Du bi-Min Shi Department of Endocrinology and Metabolism The First Affiliated Hospital of Soochow UniversitySuzhou 215000Jiangsu ProvinceChina

BACKGROUND Non-alcoholic fatty liver disease has become the most common chronic liver disease worldwide,which originates from the accumulation of triglyceride(TG)in the *** with type 2 diabetes mellitus(T2DM)are considered to have a predisposition to hepatic ***,the influencing factors for hepatic fat accumulation in T2DM patients remain *** To investigate the influencing factors for hepatic fat accumulation in T2DM *** We enrolled 329 T2DM patients admitted to the Endocrinology Department of the First Affiliated Hospital of Soochow University,who underwent MR mDIXONQuant examination to quantify the hepatic fat fraction(HFF).According to body mass index(BMI),the patients were divided into normal weight,overweight,and obese *** differences in general statistics,biochemical parameters,islet function,and HFF were compared among the three *** associations between HFF and other parameters and the influences of various parameters on the severity of hepatic fat accumulation were *** The HFF of T2DM patients gradually increased in the normal weight,overweight,and obese groups(Pbilirubin,glutamyl transpeptidase,lactate dehydrogenase,albumin(ALB),uric acid(UA),total cholesterol,TG,low-density lipoprotein cholesterol(LDL-C),C-reactive protein,free triiodothyronine,fasting insulin,fasting C-peptide,and homeostasis model assessment of insulin resistance(Pbinary logistic regression analysis showed that BMI,ALT,ALB,and LDL-C were independent risk factors for moderate to severe fa

关键词： Type 2 diabetes mellitus Non-alcoholic fatty liver disease Hepatic steatosis Obesity MR mDIXON-Quant imaging Cross-sectional study

Modeling the heterogeneous traffic flow considering the effect of self-stabilizing and autonomous vehicles

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Chinese Physics B 2022年第2期31卷 434-443页

作者： Yuan Gong wen-Xing zhu School of Control Science and Engineering Shandong UniversityJinan 250061China

With the increasing maturity of automatic driving technology,the homogeneous traffic flow will gradually evolve into the heterogeneous traffic flow,which consists of human-driving and autonomous *** better study the characteristics of the heterogeneous traffic system,this paper proposes a new car-following model for autonomous vehicles and heterogeneous traffic flow,which considers the self-stabilizing effect of *** linear and nonlinear methods,this paper deduces and analyzes the stability of such a car-following model with the self-stabilizing ***,the model is verified by numerical *** results show that the self-stabilizing effect can make the heterogeneous traffic flow more stable,and that increasing the self-stabilizing coefficient or historical time length can strengthen the stability of heterogeneous traffic flow and alleviate traffic congestion *** addition,the heterogeneous traffic flow can also be stabilized with a higher proportion of autonomous vehicles.

关键词： heterogeneous traffic flow self-stabilizing effect car-following model autonomous vehicle

CMAGAN:classifier-aided minority augmentation generative adversarial networks for industrial imbalanced data and its application to fault prediction

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Advances in Manufacturing 2024年第3期12卷 603-618页

作者： wen-Jie Wang Zhao Liu Ping zhu School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240People’s Republic of China National Engineering Research Center of Automotive Power and Intelligent Control Shanghai Jiao Tong UniversityShanghai200240People’s Republic of China School of Design Shanghai Jiao Tong UniversityShanghai200240People’s Republic of China

Class imbalance is a common characteristic of industrial data that adversely affects industrial data mining because it leads to the biased training of machine learning *** address this issue,the augmentation of samples in minority classes based on generative adversarial networks(GANs)has been demonstrated as an effective *** study proposes a novel GAN-based minority class augmentation approach named classifier-aided minority augmentation generative adversarial network(CMAGAN).In the CMAGAN framework,an outlier elimination strategy is first applied to each class to minimize the negative impacts of ***,a newly designed boundary-strengthening learning GAN(BSLGAN)is employed to generate additional samples for minority *** incorporating a supplementary classifier and innovative training mechanisms,the BSLGAN focuses on learning the distribution of samples near classification ***,it can fully capture the characteristics of the target class and generate highly realistic samples with clear ***,the new samples are filtered based on the Mahalanobis distance to ensure that they are within the desired *** evaluate the effectiveness of the proposed approach,CMAGAN was used to solve the class imbalance problem in eight real-world fault-prediction *** performance of CMAGAN was compared with that of seven other algorithms,including state-of-the-art GAN-based methods,and the results indicated that CMAGAN could provide higher-quality augmented results.

关键词： Class imbalance Minority class augmentation Generative adversarial network(GAN) Boundary strengthening learning(BSL) Fault prediction

Shale Lithofacies and Sedimentary Environment of the Third Member,Shahejie Formation,Zhanhua Sag,Eastern China

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 1024-1040页

作者： zhu Xiaomin ZHANG Meizhou zhu Shifa DONG Yanlei LI Chao bi Yuequan MA Lichi State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Shengli Oilfield Company SinopecDongyingShandong 257000China

Researches into shale lithofacies,their sedimentary environments and relationship benefit understanding both of sedimentary cycle division and unconventional hydrocarbon exploration in lacustrine *** on a 100~300-m-thick dark shale,mudstone and limestone encountered in the lower third member of the Eocene Shahejie Formation(Es3l member)in Zhanhua Sag,Bohai Bay Basin,eastern China,routine core analysis,thin sectioning,scanning electron microscopy(SEM),mineralogical and geochemical measurements were used to understand detailed facies characterization and paleoclimate in the *** Es3l shale sediment includes three sedimentary cycles(C3,C2 and C1),from bottom to top,with complex sedimentary characters and spatial *** terms of the composition,texture,bedding and thickness,six lithofacies are recognized in this *** geochemical parameters,such as trace elements(Sr/Ba,Na/Al,V/Ni,V/(V+Ni),U/Th),carbon and oxygen isotopes(δ^(18)O,δ^(13)C),and total organic carbon content(TOC)indicate that the shales were deposited in a deep to semi-deep lake,with the water column being salty,stratified,enclosed and *** cycles C3 and C2 of the middle-lower sections,the climate was arid,and the water was salty and *** and laminar mudstone-limestone was deposited with moderate organic matter(average TOC 1.8%)and good reservoir quality(average porosity 6.5%),which can be regarded as favorable *** the C1 cycle,a large amount of organic matter was input from outside the basin and this led to high productivity with a more humid *** calcareous mudstone was deposited,and this is characterized by high TOC(average 3.6%)and moderate porosity(average 4%),and provides favorable source rocks.

关键词： unconventional energy resources shale lithofacies sedimentary environment Shahejie Formation Zhanhua Sag Bohai Bay basin

Treatment of oily wastewater using submerged photocatalytic membrane reactor

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Particuology 2024年第11期94卷 252-260页

作者： Hassan G.Gomaa wen Zhou Jesse zhu Chemical and biochemical Engineering Department Western UniversityLondonONN6A 5B9Canada

The increase in oily contaminated wastewater emissions has made it essential to develop efficient treatment approaches to mitigate its negative impact on the ecosystem and human *** this research,a suspended catalyst photocatalytic membrane reactor(SPMR)is developed for simultaneous oil-water separation as well as pollutants degradation using ZnO as a photocatalyst and a submerged LED-UV light.A composite membrane unit was used in the reactor that was made of a polymeric layer and a superhydrophilic(SHPI)underwater oleophobic *** later was prepared by attaching ZnO nanoparticles(NP)on stainless steel mesh using the spraying *** pure water flux of the composite membrane was comparable to that of the pristine polymeric membrane indicating minor resistance of the SHPI *** oil-water emulsion,water flux∼1332 L m^(−2) h^(−1) was achieved at 20 kPa transmembrane pressure(TMP)with∼99%oil separation *** methylene blue dye(MB)decolourizations to assess simultaneous oil-water separation and pollutant degradation efficiencies,close to 86%dye decolourization and near complete oil water separation was *** results suggest a promising potential of the proposed design for treatment of contaminated oily wastewater.

关键词： Membrane reactors Photocatalysis Emulsions