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Structural dynamic responses analysis applying differential quadrature method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第11期7卷 1831-1838页

作者： PU jun-ping zheng Jian-jun College of Architecture and Civil Engineering Zhejiang University of Technology Hangzhou 310032 China

Unconditionally stable higher-order accurate time step integration algorithms based on the differential quadrature method (DQM) for second-order initial value problems were applied and the quadrature rules of DQM, computing of the weighting coefficients and choices of sampling grid points were discussed. Some numerical examples dealing with the heat transfer problem, the second-order differential equation of imposed vibration of linear single-degree-of-freedom systems and double-degree-of-freedom systems, the nonlinear move differential equation and a beam forced by a changing load were computed, respectively. The results indicated that the algorithm can produce highly accurate solutions with minimal time consumption, and that the system total energy can remain conservative in the numerical computation.

关键词： Differential quadrature method (DQM) Dynamic response analysis Conservation of energy

A Lightweight Anonymous Device Authentication Scheme for Information-Centric Distribution Feeder Microgrid

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Computers, Materials & Continua 2021年第11期69卷 2141-2158页

作者： Anhao Xiang jun zheng Department of Computer Science and Engineering New Mexico Institute of Mining and TechnologySocorro87801NMUSA

Distribution feeder microgrid(DFM)built based on existing distributed feeder(DF),is a promising solution for modern *** contains a large number of heterogeneous devices that generate heavy network traffice and require a low data delivery *** information-centric networking(ICN)paradigm has shown a great potential to address the communication requirements of smart ***,the integration of advanced information and communication technologies with DFM make it vulnerable to cyber *** authentication of grid devices is essential for preventing unauthorized accesses to the grid network and defending against cyber *** this paper,we propose a new lightweight anonymous device authentication scheme for DFM supported by named data networking(NDN),a representative implementation of *** perform a security analysis to show that the proposed scheme can provide security features such as mutual authentication,session key agreement,defending against various cyber attacks,anonymity,and resilience against device capture *** security of the proposed scheme is also formally verified using the popular AVISPA(Automated Validation of Internet Security Protocols and Applications)*** computational and communication costs of the proposed scheme are *** results demonstrate that the proposed scheme achieves significantly lower computational,communication and energy costs than other state-of-the-art schemes.

关键词： Mutual authentication information-centric networking named data networking distribution feeder microgrid smart devices AVISPA security

Performance of fixed geosynthetic technique of GRPS embankment

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维普期刊数据库

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Journal of Central South University 2013年第8期20卷 2245-2254页

作者： ZHANG jun zheng jun-jie MA Qiang Key Laboratory of Highway Construction and Maintenance Technology in Loess Region Shanxi Transportation Research Institute Taiyuan 030006 China Institute of Geotechnical and Underground Engineering Huazhong University of Science and Technology Wuhan 430074 China

Geosynthetic-reinforced and pile-supported （GRPS） embankment has been increasingly constructed in a large number of regions and for a wide range of projects in the past decades. However, many disadvantages are exposed through a lot of applications on conventional technique of GRPS embankment （called CT embankment）, i.e., intolerable settlement and lateral displacement, low geosynthetic efficiency, etc. In view of these disadvantages, the fixed geosynthetic technique of GRPS embankment （called FGT embankment） is developed in this work. In this system, the geosynthetic is fixed on the pile head by the steel bar fulcrum and concrete fixed top. The principles and construction techniques involved in the FGT embankment are described firstly. Then, the numerical analysis method and two-stage analysis method are used to study the performance of FGT embankment, respectively. It is shown that the FGT embankment can provide a better improvement technique to construct a high embankment over soft ground.

关键词： geosynthetic-reinforced and pile-supported embankment fixed geosynthetic technique numerical analysis two-stageanalysis method soft soil

Risk factors of metabolic syndrome after liver transplantation

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Hepatobiliary & Pancreatic Diseases International 2015年第6期14卷 582-587页

作者： jun zheng Wei-Lin Wang Division of Hepatobiliary and Pancreatic Surgery Department of SurgeryFirst Affiliated HospitalZhejiang University School of Medicine Department of Surgery The University of Hong Kong Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases

BACKGROUND： Liver transplantation is a treatment of choice for both acute and chronic liver failure. Accompanied with the increase of long-term survival rates of recipients, metabolic syndrome and its individual components, including obesity, hyperglycemia, hypertension and hyperlipidemia, have become more frequent post liver transplantation. Here we reviewed the literature concerning the risk factors for the development of metabolic complications in liver recipients.

关键词： liver transplantation risk factors hypertension hyperlipidemia diabetes mellitus

Redesign of a conformal boundary recovery algorithm for 3D Delaunay triangulation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第12期7卷 2031-2042页

作者： CHEN Jian-jun zheng Yao Center for Engineering and Scientific Computation School of Computer Science Zhejiang University Hangzhou 310027 China

Boundary recovery is one of the main obstacles in applying the Delaunay criterion to mesh generation. A stan- dard resolution is to add Steiner points directly at the intersection positions between missing boundaries and triangulations. We redesign the algorithm with the aid of some new concepts, data structures and operations, which make its implementation routine. Furthermore, all possible intersection cases and their solutions are presented, some of which are seldom discussed in the litera- ture. Finally, numerical results are presented to evaluate the performance of the new algorithm.

关键词： Boundary recovery Delaunay triangulation Mesh generation Data structure

P-Twisted Affine Lie Algebras and Their Associated Vertex Algebras

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Communications in Theoretical Physics 2008年第7期50卷 7-12页

作者： DING Lu zheng Zhu-jun Institute of Applied Mathematics Academy of Mathematics and Systems Science the Chinese Academy of Sciences Beijing 100080 China School of Mathematical Sciences South China University of Technology Guangzhou 510641 China Institute of Mathematics Henan University Kaifeng 475001 China

For any finite-dimensional semisimple Lie algebra g, a Z＋-graded vertex algebra is construsted on the vacuum representation Vk（g[θ]of g[θ]）,which is a one-dimentionM central extension of 8-invariant subspace on t... 详细信息

关键词： p-twisted affine Lie algebra vertex algebra

Brief Communications:QTLNetworkR:an interactive R package for QTL visualization

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第7期11卷 512-515页

作者： Wen-jun zheng Jian YANG jun ZHU Institute of Bioinformatics Zhejiang University Hangzhou 310029 China Queensland Institute of Medical Research Brisbane Queensland 4006 Australia

QTLNetworkR is an R package that aims to provide a user-friendly and platform-independent tool to visualize quantitative trait loci (QTL) mapping results. The graphical functions of the QTLNetworkR are based upon lattice and grid packages, and the graphical user interface (GUI) of the QTLNetworkR is built upon RGtk2 and gWidgetsRGtk2 packages. Six functions are designed to help visualize marker interval, putative QTL, QTL-by- environment interactions, marker interval interactions, epistasis, and the predicted genetic architecture of complex traits. It is especially helpful in profiling results for multiple traits at multiple environments. The current version of QTLNetworkR is able to accept QTL mapping results from QTLNetwork, and it is ready for possible extensions to import results from some other QTL mapping software packages. In addition, we presented a QTL mapping result in rice (Oryza sativa) as an example to describe the features of QTLNetworkR.

关键词： Visualization Quantitative trait loci (QTL) QTL mapping R package QTLNetworkR

A novel method of constructing high-dimensional digital chaotic systems on finite-state automata

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Chinese Physics B 2020年第9期29卷 233-243页

作者： jun zheng Han-Ping Hu School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Image Information Processing and Intelligent Control Ministry of EducationWuhan 430074China

When chaotic systems are implemented on finite precision machines, it will lead to the problem of dynamical degradation. Aiming at this problem, most previous related works have been proposed to improve the dynamical degradation of low-dimensional chaotic maps. This paper presents a novel method to construct high-dimensional digital chaotic systems in the domain of finite computing precision. The model is proposed by coupling a high-dimensional digital system with a continuous chaotic system. A rigorous proof is given that the controlled digital system is chaotic in the sense of Devaney's definition of chaos. Numerical experimental results for different high-dimensional digital systems indicate that the proposed method can overcome the degradation problem and construct high-dimensional digital chaos with complicated dynamical properties. Based on the construction method, a kind of pseudorandom number generator (PRNG) is also proposed as an application.

关键词： high-dimensional digital chaotic system dynamical degradation anti-control pseudorandom number generator

An overview of emissions of SO2 and NOx and the long-range transport of oxidized sulfur and nitrogen pollutants in East Asia

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Journal of Environmental Sciences 2016年第6期28卷 13-25页

作者： Yu Qu junling An Youjiang He jun zheng State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Chinese Research Academy of Environmental Sciences Beijing 100012 China China-ASEAN Environmental Cooperation Center Ministry of Environmental Protection of the People's Republic of ChinaBeijing 100035 China

The long-range transport of oxidized sulfur（sulfur dioxide（SO2） and sulfate） and oxidized nitrogen（nitrogen oxides（NOx ） and nitrate） in East Asia is an area of increasing scientific interest and political concern. This paper reviews various published papers, including ground- and satellite-based observations and numerical simulations. The aim is to assess the status of the anthropogenic emissions of SO2 and NOx and the long-range transport of oxidized S and N pollutants over source and downwind region. China has dominated the emissions of SO2 and NOx in East Asia and urgently needs to strengthen the control of their emissions, especially NOx emissions. Oxidized S and N pollutants emitted from China are transported to Korea and Japan, due to persistent westerly winds, in winter and ***, the total contributions of China to S and N pollutants across Korea and Japan were not found to be dominant over longer time scales（e.g., a year）. The source–receptor relationships for oxidized S and N pollutants in East Asia varied widely among the different studies. This is because：（1） the nonlinear effects of atmospheric chemistry and deposition processes were not well considered, when calculating the source–receptor relationships;（2） different meteorological and emission data inputs and solution schemes for key physical and chemical processes were used; and（3） different temporal and spatial scales were employed. Therefore, simulations using the same input fields and similar model configurations would be of benefit, to further evaluate the source–receptor relationships of the oxidized S and N pollutants.

关键词： Long-range transport Sulfate Nitrate East Asia Source–receptor relationships