检索结果-南通市图书馆

Evolutionary Particle Swarm Optimization Algorithm Based on Collective Prediction for Deployment of Base Stations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 345-369页

作者： Jiaying Shen Donglin Zhu Yujia Liu Leyi Wang Jialing Hu Zhaolong Ouyang Changjun Zhou Taiyong Li school of Computer Science and Technology Zhejiang Normal UniversityJinhua321004China school of Future Technologies Jiangxi Institute of Applied Science and TechnologyNanchang330000China school of Computing and Artificial Intelligence Southwestern University of Finance and EconomicsChengdu611130China

The wireless signals emitted by base stations serve as a vital link connecting people in today’s society and have been occupying an increasingly important role in real *** development of the Internet of Things(IoT)relies on the support of base stations,which provide a solid foundation for achieving a more intelligent way of *** a specific area,achieving higher signal coverage with fewer base stations has become an urgent ***,this article focuses on the effective coverage area of base station signals and proposes a novel Evolutionary Particle Swarm Optimization(EPSO)algorithm based on collective prediction,referred to herein as *** a new strategy called neighbor-based evolution prediction(NEP)addresses the issue of premature convergence often encountered by *** also employs a strengthening evolution(SE)strategy to enhance the algorithm’s global search capability and efficiency,ensuring enhanced robustness and a faster convergence speed when solving complex optimization *** better adapt to the actual communication needs of base stations,this article conducts simulation experiments by changing the number of base *** experimental results demonstrate thatunder the conditionof 50 ormore base stations,ECPPSOconsistently achieves the best coverage rate exceeding 95%,peaking at 99.4400%when the number of base stations reaches *** results validate the optimization capability of the ECPPSO algorithm,proving its feasibility and *** ablative experiments and comparisons with other algorithms highlight the advantages of ECPPSO.

关键词： Particle swarm optimization effective coverage area global optimization base station deployment

High-dimensional large-scale mixed-type data imputation under missing at random

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2025年

作者： Wei Liu Guizhen Li Ling Zhou Lan Luo school of Mathematics Sichuan University Center of Statistical Research and school of Statistics Southwestern University of Finance and Economics Department of Statistics and Actuarial Science University of Iowa

Missingness in mixed-type variables is commonly encountered in a variety of areas. The requirement of complete observations necessities data imputation when a moderate or large proportion of data is ***, inappropriate imputation would downgrade the performance of machine learning algorithms, leading to bad predictions and unreliable statistical inference. For high-dimensional large-scale mixed-type missing data, we develop a computationally efficient imputation method, missing value imputation via generalized factor models（MIG）, under missing at random. The proposed MIG method allows missing variables to be of different types,including continuous, binary, and count variables, and are scalable to both data size n and variable dimension p while existing imputation methods rely on restrictive assumptions such as the same type of missing variables,the low dimensionality of variables, and a limited sample size. We explicitly show that the imputation error of the proposed MIG method diminishes to zero with the rate Op(max{n-1/2, p-1/2}) as both n and p tend to infinity. Five real datasets demonstrate the superior empirical performance of the proposed MIG method over existing methods that the average normalized absolute imputation error is reduced by 5.3%–34.1%.

关键词：

Exit options sustain altruistic punishment and decrease the second-order free-riders, but it is not a panacea

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年第1期68卷 278-291页

作者： Chen SHEN Zhao SONG Lei SHI Jun TANIMOTO Zhen WANG Faculty of Engineering Sciences Kyushu University school of Statistics and Mathematics Yunnan University of Finance and Economics school of Computing Engineering and Digital Technologies Teesside University school of Artificial Intelligence OPtics and Electro Nics (iOPEN) Northwestern Polytechnical University

Why do humans punish free riders at their own expense? This behavior represents an evolutionary puzzle in human societies. This study explores the role of exit strategies in fostering altruistic punishment within evolutionary game theory. We extend the traditional prisoner's dilemma model by incorporating exiters, players who opt out for a small payoff while nullifying their opponent's payoff, and altruistic punishers who cooperate and punish non-cooperators. Our findings indicate that in well-mixed populations, exiters destabilize defection but do not promote altruistic punishment. In social networks, however,exiters enable altruistic punishment via cyclic dominance among altruistic punishers, defectors, and exiters. Notably, this cyclic dominance is sensitive to exit payoffs; adjustments can lead to cyclic dominance of non-punishing cooperators, defectors, and exiters, or to a bi-stable state between these two types of cyclic dominance. These results highlight the nuanced impact of exiters on altruistic punishment, emphasizing the need for careful incentivization of exit behavior. While exiters can support altruistic punishment in networked populations, their effectiveness is not a panacea and is highly sensitive to exit payoffs, indicating limits to the voluntary participation mechanism.

关键词： evolutionary game theory altruistic punishment coexistence cyclic dominance bi-stable

Extensions and Deformations of 3-Lie Algebras with Higher Derivations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2025年第1期 20-32页

作者： Shuangjian GUO school of Mathematics and Statistics Guizhou University of Finance and Economics

In this paper, we call a tuple consisting of 3-Lie algebra and a higher derivation on it a 3-LieHDer pair. We introduce a cohomology theory of 3-LieHDer pairs. Next, we interpret the second cohomology group as the space of all isomorphism classes of abelian extensions. Finally,we consider formal deformations of 3-LieHDer pairs that are governed by the cohomology with self-coefficient.

关键词：

Accuracy and Consistency of the Explicit-Invariant Energy Quadratization Approach for the Cahn-Hilliard Equation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2025年第1期 84-104页

作者： Jun ZHANG Fangying SONG Yu ZHANG Computational Mathematics Research Center Guizhou University of Finance and Economics school of mathematics and statistics Guizhou University of Finance and Economics school of Mathematics and Stastistics Fuzhou University

It is well known that the explicit-invariant energy quadratization (EIEQ) approach can generate fully decoupled, linear and unconditionally energy-stable numerical schemes, so it is favored by many researchers. However, the undeniable fact is that the numerical method obtained by EIEQ approach preserves the “modified” energy law instead of the original *** is mainly due to the introduction of some auxiliary variables in EIEQ scheme, and the truncation error will make the auxiliary variables deviate from the original definition in the process of numerical calculation. The primary objective of this paper is to address this gap by providing the accuracy and consistency of the EIEQ method in the context of the CahnHilliard equation. We introduce a relaxation technique for auxiliary variables and construct two numerical schemes based on EIEQ. The analysis results show that the newly constructed schemes are not only unconditionally energy stable, linear and fully decoupled, but also can effectively correct the errors introduced by auxiliary variables and follow the original energy ***, several 2D and 3D numerical examples illustrate the accuracy and efficiency of the newly constructed numerical schemes.

关键词：

Machine Allocation in Semiconductor Wafer Fabrication Systems:A Simulation-Based Approach

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2023年第3期32卷 372-390页

作者： Yanfeng Wu Sihua Chen school of finance Jjiangxi University of Finance and EconomicsNanchang 330013China school of Information Management Jiangxi University of Finance and EconomicsNanchang 330032China

The problem of maximizing the throughput of Semiconductor Wafer Fabrication Systems is *** model the fabrication systems as a Stochastic Timed Automata and design a discrete-event simulation *** simulation scheme is explicit,fast and achieves high fidelity which captures the feature of reentrant process flow and is flexible to accommodate diversified wafer lot scheduling policies.A series of Marginal Machine Allocation Algorithms are proposed to sequentially allocate *** experiments suggest the designed methods are efficient to find good allocation solutions.

关键词： Semiconductor wafer fabrication system machine allocation discrete-event simulation marginal machine allocation

Optimal dividend and capital injection problem with a random time horizon and a ruin penalty in the dual model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2015年第3期30卷 325-339页

作者： ZHAO Yong-xia YAO Ding-jun school of Statistics Qufu Normal University school of finance Nanjing University of Finance and Economics

In the dual risk model, we consider the optimal dividend and capital injection problem, which involves a random time horizon and a ruin penalty. Both fixed and proportional costs from the transactions of capital injection are considered. The objective is to maximize the total value of the expected discounted dividends, and the penalized discounted both capital injections and ruin penalty during the horizon, which is described by the minimum of the time of ruin and an exponential random variable. The explicit solutions for optimal strategy and value function are obtained, when the income jumps follow a hyper-exponential ***, some numerical examples are presented to illustrate our results.

关键词： dual model transaction cost dividend capital injection HJB equation

维普期刊数据库

On a Dual Risk Model Perturbed by Diffusion with Dividend Threshold

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2016年第5期37卷 777-792页

作者： Hui ZHI Jiangyan PU school of Mathematical Sciences Fudan University school of International finance Shanghai Finance University

In the dual risk model, the surplus process of a company is a L′evy process with sample paths that are skip-free downwards. In this paper, the authors assume that the surplus process is the sum of a compound Poisson process and an independent Wiener process. The dual of the jump-diffusion risk model under a threshold dividend strategy is discussed. The authors derive a set of two integro-differential equations satisfied by the expected total discounted dividend until ruin. The cases where profits follow an exponential or mixtures of exponential distributions are solved. Applying the key method of the Laplace transform, the authors show how the integro-differential equations are solved. The authors also discuss the conditions for optimality and show how an optimal dividend threshold can be calculated as well.

关键词： exponential surplus admissible assume Laplace Poisson until Wiener derive continuity

维普期刊数据库

THE IMPACT OF WARRANTS INTRODUCTION:SIGN EFFECT OR MAGNITUDE EFFECT?

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2013年第3期26卷 419-431页

作者： ZHOU Hailin DING Zhonging XIE Haibin WU Xinyu WANG Shouyang school of finance Anhui University of Finance and Economics school of Banking and finance University of Business and Economics MADIS Academy of Mathematics and Systems ScienceChinese Academy of Sciences

The data of warrants underlying stocks was selected for the sample period from August,2005 to December,*** data the authors collected did not include the announcement date of reform of non-tradable underlying shares,and was available from Shanghai and Shenzhen stock *** event study method is employed to test the magnitude effect based on the Wild bootstrap,which is performed on the abnormal return,the cumulative abnormal return,and the standardized cumulative abnormal *** results show no evidence of magnitude effect but sign effect after warrants *** authors argue that this phenomenon is caused by the migration of radical agents from stock market to warrant market.

关键词： Magnitude effect sign effect warrant introduction wild bootstrap event study wild bootstrap sigh test.

维普期刊数据库