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A New Sensitivity Analysis Approach Using Conditional Nonlinear Optimal Perturbations and Its Preliminary Application

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Advances in Atmospheric Sciences 2023年第2期40卷 285-304页

作者： Qiujie REN mu mu Guodong SUN Qiang WANG State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China College of Oceanography Hohai UniversityNanjing 210098China

Simulations and predictions using numerical models show considerable uncertainties,and parameter uncertainty is one of the most important *** is impractical to improve the simulation and prediction abilities by reducing the uncertainties of all ***,identifying the sensitive parameters or parameter combinations is *** study proposes a novel approach:conditional nonlinear optimal perturbations sensitivity analysis(CNOPSA)*** CNOPSA method fully considers the nonlinear synergistic effects of parameters in the whole parameter space and quantitatively estimates the maximum effects of parameter uncertainties,prone to extreme *** of the analytical g-function test indicate that the CNOPSA method can effectively identify the sensitivity of *** results of the theoretical five-variable grassland ecosystem model show that the maximum influence of the simulated wilted biomass caused by parameter uncertainty can be estimated and computed by employing the CNOPSA *** identified sensitive parameters can easily change the simulation or prediction of the wilted biomass,which affects the transformation of the grassland state in the grassland *** variance-based approach may underestimate the parameter sensitivity because it only considers the influence of limited parameter samples from a statistical *** study verifies that the CNOPSA method is effective and feasible for exploring the important and sensitive physical parameters or parameter combinations in numerical models.

关键词： physical parameters parameter uncertainty sensitivity analysis nonlinear optimization land-surface process

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Key continual-leakage resilient broadcast cryptosystem from dual system in broadcast networks

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Frontiers of Computer Science 2014年第3期8卷 456-468页

作者： Mingwu ZHANG Yi mu School of Computer Sciences Hubei University of Technology Wuhan 430068 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China School of Computer Science and Software Engineering University of Wollongong Wollongong NSW 2522 Australia

In order to tolerate possible leakage of secret keys, leakage-resilient cryptosystem models a class of attractive leakage output by allowing an adversary to provide any computable leakage function and learning the partial keys or other possible intemal states from the output of function. In this work, we present an adaptively secure broadcast encryption resilient to key continual leakage in the standard model. Our scheme provides the tolerance of continual leakage, in which any user can generate multiple private keys per user by periodically updating the key. We use the dual system encryption mechanism to implement the leakage resilience and adaptive security, and intrinsically set an algorithm to refresh a key and produce a same distributed new key. We also give the evaluation of the leakage bound and leakage fraction, and the simulations show that our scheme can tolerate about 71% leakage fraction with 3.34× 10^-52 failure probability in standard 80-bit security level when we adjust the leakage factor to allow the private key to be 100 Kb.

关键词： broadcast encryption leakage resilience dual system encryption leakage fraction

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Preface to the Special Issue on the National Report to the 28th IUGG General Assembly by CNC-IAMAS (2019−2022)

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Advances in Atmospheric Sciences 2023年第8期40卷 1337-1338页

作者： mu mu Lei WANG Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China

The 28th General Assembly of the International Union of Geodesy and Geophysics(IUGG)will be held on 11-20 July 2023 in Berlin,*** Chinese National Committee(CNC)for the International Association of Meteorology and Atmospheric Sciences(IAMAS)has invited leading Chinese scientists to review the progress and achievements in meteorology and atmospheric sciences in China since 2019,continuing its nearly 40 years tradition of submitting national reports to *** last four national reports were published as special issues in Advances in Atmospheric Sciences(AAS),the only associated journal of IAMAS,in 2007,2012,and 2019,*** special issues have received increasing global attention and are widely cited.

关键词： meteorology submit journal

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GLOBAL INPUT-TO-STATE STABILIZATION WITH QUANTIZED FEEDBACK FOR DISCRETE-TIME PIECEWISE AFFINE SYSTEMS WITH TIME DELAYS

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Journal of Systems Science & Complexity 2013年第6期26卷 925-939页

作者： mu Xiaowu GAO Yang Department of Mathematics Zhengzhou University Graduate School of Beijing University Department of Mathematics Daqing Normal University Graduate School of the Harbin Institute of Technology

In this paper, global input-to-state stabilization with quantized feedback for discrete-time piecewise affine systems （PWA） with time delays are considered. Both feedback with time delays and feedback without time delays are considered. Piecewise quadratic ISS-Lyapunov functions are adopted. Both Lyapunov-Razumikhin and Lyapunov-Krasovskii methods are adopted. The theorems for global input-to-state stabilization with quantized feedback of discrete PWA systems with time delays are

关键词： Discrete systems input-to-state stability piecewise affine systems quantized feedback stabilization.

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INFERENCE FOR REPEATED MEASURES MODELS UNDER HETEROSCEDASTICITY

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Journal of Systems Science & Complexity 2012年第6期25卷 1158-1170页

作者： Weiyan mu Xingzhong XU Science School Beijing University of Civil Engineering and Architecture School of Mathematics Beijing Institute of Technology

This paper considers a widely used mixed effects model in repeated measures under het- eroscedasticity. Hypotheses of the equality of the fixed effects and the simultaneous confidence intervals for all pair-wise differences are discussed. A generalized F-test has been proposed to test the equality of the fixed effects in the model, but simulation results for evaluating its performance have not been shown in the literature. Moreover, the generalized F-test cannot be used to deduce the simultaneous confidence intervals for all pair-wise differences of the fixed effects. The authors propose two new p-values to test the hypotheses of equality of the fixed effects and simultaneous confidence intervals of the differences of the effects based on the generalized pivotal quantities derived in this paper. The authors also compare the empirical performances of the proposed tests and the generalized F-test. The type I error rates and powers of these tests are evaluated using the Monte Carlo simulation. The simulation studies show that the generalized F-test does not perform well in terms of type I error rate under various sample size and parameter combinations. However, the type I error probabilities of the proposed tests are always close to the nominal value. It can also be seen that the simultaneous confidence intervals perform well.

关键词： Generalized p-values heteroscedasticity mixed effect repeated measures models simul-taneous confidence intervals.

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Description of mixed symmetry states in 96Ru using IBM-2

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Science China(Physics,Mechanics & Astronomy) 2017年第4期60卷 32-39页

作者： DaLi ZHANG ChengFu mu Department of Physics Huzhou University Huzhou 313000 China

We have investigated the properties of low-tyiag states iu 96Ru within the framework of the neutron-proton interacting boson model （IBM-2）, with special attention paid to the characteristics of the mixed symmetry states. By considering the relative energy of d proton boson to be different from that of neutron boson, the level energies and M1, E2 transition strengths have been calculated. The IBM-2 calculation is consistent with the experimental data of 96Ru both quantitatively and qualitatively. Particularly, the strong M1 transition between the 42^＋ and 41^＋ states has been reproduced nicely. The calculated results show that the M1 transition strength of B（M1,42^＋ → 41^＋） in 96Ru carl be described successfully by the IBM-2.

关键词： 96Ru mixed-symmetry M1 transition strengths IBM-2

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Optimizing Connections:Applied Shortest Path Algorithms for MANETs

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 787-807页

作者： Ibrahim Alameri jitka Komarkova Tawfik Al-Hadhrami Abdulsamad Ebrahim Yahya Atef Gharbi Faculty of Medical Sciences Jabir Ibn Hayyan Medical UniversityAlkufaNajaf54001Iraq Faculty of Economics and Administration University of PardubiceStudentskaPardubice53210Czech Republic Computer Science Department School of Science and TechnologyNottingham Trent UniversityNottinghamNG118NSUK Department of Information Technology College of Computing and Information TechnologyNorthern Border UniversityArar91431Saudi Arabia Department of Information System College of Computing and Information TechnologyNorthern Border UniversityArar91431Saudi Arabia

This study is trying to address the critical need for efficient routing in Mobile Ad Hoc Networks(MANETs)from dynamic topologies that pose great challenges because of the mobility of *** objective was to delve into and refine the application of the Dijkstra’s algorithm in this context,a method conventionally esteemed for its efficiency in static ***,this paper has carried out a comparative theoretical analysis with the Bellman-Ford algorithm,considering adaptation to the dynamic network conditions that are typical for *** paper has shown through detailed algorithmic analysis that Dijkstra’s algorithm,when adapted for dynamic updates,yields a very workable solution to the problem of real-time routing in *** results indicate that with these changes,Dijkstra’s algorithm performs much better computationally and 30%better in routing optimization than Bellman-Ford when working with configurations of sparse *** theoretical framework adapted,with the adaptation of the Dijkstra’s algorithm for dynamically changing network topologies,is novel in this work and quite different from any traditional *** adaptation should offer more efficient routing and less computational overhead,most apt in the limited resource environment of ***,from these findings,one may derive a conclusion that the proposed version of Dijkstra’s algorithm is the best and most feasible choice of the routing protocol for MANETs given all pertinent key performance and resource consumption indicators and further that the proposed method offers a marked improvement over traditional *** paper,therefore,operationalizes the theoretical model into practical scenarios and also further research with empirical simulations to understand more about its operational effectiveness.

关键词： Dijkstra’s algorithm optimization complexity analysis shortest path first comparative algorithm analysis nondeterministic polynomial(NP)-complete

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Description of spectrum and electromagnetic transitions in ^(94)Mo through the proton-neutron interacting boson model

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Science China(Physics,Mechanics & Astronomy) 2018年第1期61卷 37-43页

作者： ChengFu mu DaLi Zhang Department of Physics Huzhou University

We investigated the properties of low-lying states in ^(94)Mo within the framework of the proton-neutron interacting boson model(IBM-2), with special focus on the characteristics of mixed-symmetry states. We calculated level energies and M1 and E2 transition strengths. The IBM-2 results agree with the available quantitative and qualitative experimental data on ^(94)Mo. The properties of mixed-symmetry states can be well described by IBM-2 given that the energy of the d proton boson is different from that of the neutron boson, especially for the transition of B(M1, 4_2^+→ 4_1^+).

关键词： 94Mo mixed-symmetry states M1 and E2 transition strengths IBM-2

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STABILITY OF DISCONTINUOUS NONLINEAR SINGULAR SYSTEMS

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Journal of Systems Science & Complexity 2013年第4期26卷 527-533页

作者： WEI Jumei mu Xiaowu School of Mathematics Zhengzhou University

This paper studies a class of nonlinear singular systems with discontinuous right-hand sides,it develops nonsmooth Lyapunov stability theory as well as LaSalle invariance *** this paper,LaSalle invariance principle of the discontinuous nonlinear singular systems is presented ***,some sufficient conditions for stability and asymptotic stability of the given systems based on Filippov differential inclusion and Clarke's generalized gradient are ***,these results are illustrated by the given example.

关键词： Discontinuous invariance principle nonlinear singular systems stability.

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Description of the shape coexistence in neutron-deficient ^(74,76)Kr with IBM2

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Science China(Physics,Mechanics & Astronomy) 2016年第8期59卷 43-49页

作者： DaLi Zhang ChengFu mu Department of Physics Huzhou University

The shape deformation and shape coexistence in ^(74,76) Kr isotopes are investigated within the framework of the proton-neutron interacting boson model(IBM2). By considering the relative energy of the d proton boson to be different from that of the neutron boson, the low-lying energy spectrum is in good agreement with experimental results both qualitatively and quantitatively. In particular, the low-lying 0_2^+ states associated with the shape-coexistence phenomenon are reproduced quite well. The calculated key sensitive quantities of B(E2) transition branch ratios are fairly consistent with the experimental data except for R_4. The predicated deformation parameter is very similar for the ground states in ^(74)Kr and ^(76)Kr, showing good agreement with the experimental result,and the calculated deformation parameter for the second 0^+ state in ^(74)Kr is close to the experimental data. The calculated results of the triaxiality parameter indicated an almost purely prolate shape for the ground state of ^(76)Kr and a mostly prolate shape with a little triaxiality for the ground state of ^(74)Kr. The calculations also show an oblate triaxial shape for the second 0^+ state in ^(76)Kr and maximum triaxiality for the second 0^+ state in ^(74)Kr. These results confirm the importance of the triaxial deformation for the description of such shape coexistence.

关键词： ^(74)Kr ^(76)Kr shape coexistence low-ling energy states IBM2

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