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Journal of Systems Science & Complexity 2024年第5期37卷 1907-1922页

作者： ZHANG Bao-Qiang WANG bing-chang CAO Ying School of Control Science and Engineering Shandong UniversityJinan 250000China

In this paper,the authors design a reinforcement learning algorithm to solve the adaptive linear-quadratic stochastic n-players non-zero sum differential game with completely unknown *** each player,a critic network is used to estimate the Q-function,and an actor network is used to estimate the control input.A model-free online Q-learning algorithm is obtained for solving this kind of *** is proved that under some mild conditions the system state and weight estimation errors can be uniformly ultimately bounded.A simulation with five players is given to verify the effectiveness of the algorithm.

关键词： Actor-critic algorithm model-free adaptive control nonzero-sum stochastic game reinforcement learning

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Local Asymptotics of a Markov Modulated Random Walk with Heavy-tailed Increments

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Acta Mathematica Sinica,English Series 2011年第9期27卷 1843-1854页

作者： bing chang WANG Yuan Yuan LIU Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 P. R. China School of Mathematics Railway Campus Central South University Changsha 410075 P. R. China

In this paper, we obtain sufficient and necessary conditions for local asymptotics for the maximum of a Markov modulated random walk with long-tailed increments and negative drifts, where the local asymptotics means asymptotic behaviour of P（ ∈ （x,x ＋ z]） for each z 〉 0, as x→∞ Our results extend and improve the existing ones in the literature.

关键词： Mavkov modulated random walk local asymptotics long-tailed distributions subexpo- nential distributions Wiener-Hopf factorization

Properties and Structural Optimization of Pulverized Coal for Blast Furnace Injection

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Journal of Iron and Steel Research International 2011年第3期18卷 6-12页

作者： JIANG Hai-bing chang Jian LI Jing School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The properties of mixed coals were studied on the basis of known various properties of the injecting coals in the *** structure of the injecting coals was optimized and put into practical *** was found that the ignition point was lowered with mixed coals,however,both combustibility and grindability were improved,and explosibility of the mixed coals were decreased as ***,mixed coals injection not only can improve the amount of the injecting coals greatly,but also improve the economical and technical indexes of the blast furnace.

关键词： blast furnace pulverized coal property injection

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An online value iteration method for linear-quadratic mean field social control with unknown dynamics

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Science China(Information Sciences) 2024年第4期67卷 38-39页

作者： bing-chang WANG Shumei LI Ying CAO School of Control Science and Engineering Shandong University

Mean field(MF) models have been widely applied to economics, control theory, and other fields. Its prominent feature is that the individual influence on the overall population is negligible and the impact of the entire system to the single agent is significant and cannot be ignored. As a classical problem in control theory, linear quadratic(LQ) control for MF models has been widely investigated(e.g., [1, 2]).

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Determination of minimum cover depth for shallow tunnel subjected to water pressure

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Journal of Central South University 2013年第8期20卷 2307-2313页

作者： HUANG Fu QIN chang-bing LI Shu-cai School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha 410004 China School of Civil Engineering Central South University Changsha 410075 China Geotechnical and Structural Engineering Research Center Shandong University Jinan 250061 China

Prediction of the state of roof collapse is a big challenge in tunnel engineering, while the limit analysis theory makes it possible to derive the analytical solutions of the collapse mechanisms. In this work, an exact solution of collapsing shape in shallow underwater tunnel is obtained by using the variation principle and the upper bound theorem based on nonlinear failure criterion. Numerical results under the effect of river water and supporting pressure are derived and discussed. The maximum water depth above the river bottom surface is determined under a given buried depth of shallow cavities and the critical depth of roof collapse is obtained under a constant river depth. In comparison with the previous results, the present solution shows a good agreement with the practical results.

关键词： shallow underwater subway roof collapse nonlinear failure criterion

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Investigation on the width-to-depth ratio effect on turbulent flows in a sharp meandering channel with periodic boundaries using large eddy simulations

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Journal of Hydrodynamics 2024年第4期36卷 662-677页

作者： bing-chang Zhang Dong Xu Chun-ning Ji Qi-hua Ran Key Laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of Water Resources Hohai UniversityNanjing210098China Oceans Graduate School The University of Western AustraliaPerthAustralia State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin300350China

As one of the most common river patterns in nature,meandering river has very complex flow structures in its curved channel bends,including secondary flow structure and primary flow velocity *** date,most of the studies have been carried out on the flow structures in channel bends with unavoidable influences from inlet and outlet boundaries,while a streamwise periodic boundary can overcome this shortcoming *** this paper,large eddy simulations(LES)are employed to investigate the complex flow structures in periodically continuous sharp sine-generated *** influence of width-to-depth ratios and dimensionless curvature radiuses are *** results highlight two additional vortex structures beyond the commonly known secondary currents:The recirculation zone(RZ)and the inner bank cell(IBC).The width-to-depth ratio shows the determining effect on the recirculation *** size of recirculation zone is usually bigger in sine-generated-curve(SGC)channel with large width-to-depth *** biggest recirculation zones appear between the zero-curvature section and the apex *** inner bank cell only forms in SGC channels with small width-to-depth ratios and low *** SGC channel with large width-to-depth ratios,only one circulation cell is observed near the inner *** spatial variations of turbulent features are also revealed by statistical analysis based on the LES sampling *** highlight remarkable effect of width-to-depth ratio and dimensionless curvature radius on the turbulent kinetic energy(TKE)and bed shear stress in SGC channels.

关键词： Sine-generated bend large width-to-depth ratio Reynolds number large eddy simulation(LES) turbulent structure

Intestinal virome:An important research direction for alcoholic and nonalcoholic liver diseases

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World Journal of Gastroenterology 2022年第26期28卷 3279-3281页

作者： Yan Li Wen-Cheng Liu bing chang Department of Gastroenterology The First Affiliated Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina

In recent years,the interaction between the gut microflora and liver diseases has attracted much *** intestinal microflora is composed of bacteria,archaea,fungi and *** are few studies on the intestinal virome,and whether it has a causal relationship with bacterial changes in the gut is still ***,it is undeniable that the intestinal virome is also a very important portion of the blueprint for the development of liver diseases and the diagnosis and therapeutic modalities in the future.

关键词： Alcoholic fatty liver disease Nonalcoholic fatty liver disease Fatty liver disease Gut microbiome Intestinal virome

Elafibranor:A promising treatment for alcohol-associated liver disease?

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World Journal of Gastroenterology 2024年第39期30卷 4313-4317页

作者： Hong Wei Li-Xuan Sang bing chang Department of Gastroenterology The First Affiliated Hospital of China Medical UniversityShenyang 110001Liaoning ProvinceChina Department of Gastroenterology Shengjing Hospital of China Medical UniversityShenyang 110022Liaoning ProvinceChina

We comment on an article by Koizumi et ***(EFN)is a dual pero-xisome proliferator-activated receptorα/δ*** experimental results from Koizumi et al demonstrated that EFN significantly increases intestinal barrier function and ameliorates liver *** positive outcomes suggest that EFN could be a promising therapeutic option for alcohol-associated liver disease(ALD).However,this study has limitations that necessitate further research to evaluate the efficacy of *** studies should consider the use of more appropriate animal models and cell types,optimize the administration routes and dosages of the drug,and conduct an in-depth investigation into the underlying mechanisms of action to determine the therapeutic effects of EFN in *** sustained and in-depth research,EFN has the potential to emerge as a novel therapeutic agent for the treatment of ALD.

关键词： Alcohol-associated liver disease Liver fibrosis Gut barrier function Peroxisome proliferator activated receptor Ethanol

Cronkhite-Canada syndrome:from clinical features to treatment

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Gastroenterology Report 2020年第5期8卷 333-342,I0001页

作者： Ze-Yu Wu Li-Xuan Sang bing chang Department of Gastroenterology First Hospital of China Medical UniversityShenyangLiaoningP.R.China Department of Geriatrics First Hospital of China Medical UniversityShenyangLiaoningP.R.China

Cronkhite-Canada syndrome(CCS)is a rare acquired polyposis with unknown *** date,>500 cases have been reported *** is typically characterized by gastrointestinal symptoms,such as diarrhea and skin changes(***,pigmentation,and nail atrophy).Endoscopic features include diffuse polyps throughout the entire gastrointestinal tract,except for the *** types of polyps in CCS mainly include inflammatory,hyperplastic,hamartomatous,and adenomatous *** can be complicated by many diseases and has a canceration tendency with a high mortality ***,there is no uniform standard treatment for CCS.A review of the reported cases of CCS is presented herein,with the goal of improving our understanding of this disease.

关键词： Cronkhite-Canada syndrome clinical characteristics gastrointestinal polyps malignant transformation

Ensuring data confidentiality via plausibly deniable encryption and secure deletion-a survey

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Cybersecurity 2018年第1期1卷 106-125页

作者： Qionglu Zhang Shijie Jia bing chang Bo Chen Data Assurance and Communication Security Research Center Chinese Academy of SciencesBeijingChina State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of SciencesBeijingChina School of Cyber Security University of Chinese Academy of SciencesBeijingChina School of Information Systems Singapore Management UniversitySingaporeSingapore Department of Computer Science Michigan Technological UniversityHoughtonUSA

Ensuring confidentiality of sensitive data is of paramount importance,since data leakage may not only endanger data owners’privacy,but also ruin reputation of businesses as well as violate various regulations like HIPPA and Sarbanes-Oxley *** provide confidentiality guarantee,the data should be protected when they are preserved in the personal computing devices(i.e.,confidentiality during their lifetime);and also,they should be rendered irrecoverable after they are removed from the devices(i.e.,confidentiality after their lifetime).Encryption and secure deletion are used to ensure data confidentiality during and after their lifetime,*** work aims to perform a thorough literature review on the techniques being used to protect confidentiality of the data in personal computing devices,including both encryption and secure *** for encryption,we mainly focus on the novel plausibly deniable encryption(PDE),which can ensure data confidentiality against both a coercive(i.e.,the attacker can coerce the data owner for the decryption key)and a non-coercive attacker.

关键词： Data confidentiality Plausibly deniable encryption Secure deletion