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Discrete Dynamics in Nature and Society最新文献

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Retracted: Design of Automatic Scoring System for Oral English Test Based on Sequence Matching and Big Data Analysis 基于序列匹配和大数据分析的英语口语考试自动评分系统设计
4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-10-04 DOI: 10.1155/2023/9759305
Discrete Dynamics in Nature and Society
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引用次数: 0
Retracted: Career Exploration and College Students’ Career Adaptability: The Mediating Role of Future Work Self-Salience and Moderating Role of Perceived Teacher Support 职业探索与大学生职业适应:未来工作自我显著性的中介作用和感知教师支持的调节作用
4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-10-04 DOI: 10.1155/2023/9785489
Discrete Dynamics in Nature and Society
{"title":"Retracted: Career Exploration and College Students’ Career Adaptability: The Mediating Role of Future Work Self-Salience and Moderating Role of Perceived Teacher Support","authors":"Discrete Dynamics in Nature and Society","doi":"10.1155/2023/9785489","DOIUrl":"https://doi.org/10.1155/2023/9785489","url":null,"abstract":"<jats:p />","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135552253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Retracted: Content System of Physical Fitness Training for Track and Field Athletes and Evaluation Criteria of Some Indicators Based on Artificial Neural Network 撤下:基于人工神经网络的田径运动员体能训练内容体系及部分指标评价标准
4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-10-04 DOI: 10.1155/2023/9761479
Discrete Dynamics in Nature and Society
{"title":"Retracted: Content System of Physical Fitness Training for Track and Field Athletes and Evaluation Criteria of Some Indicators Based on Artificial Neural Network","authors":"Discrete Dynamics in Nature and Society","doi":"10.1155/2023/9761479","DOIUrl":"https://doi.org/10.1155/2023/9761479","url":null,"abstract":"<jats:p />","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135552434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Retracted: An Empirical Study on the Influencing Factors of the Returning Intention of Overseas Talents 《海外人才归国意愿影响因素实证研究
4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-10-04 DOI: 10.1155/2023/9823083
Discrete Dynamics in Nature and Society
{"title":"Retracted: An Empirical Study on the Influencing Factors of the Returning Intention of Overseas Talents","authors":"Discrete Dynamics in Nature and Society","doi":"10.1155/2023/9823083","DOIUrl":"https://doi.org/10.1155/2023/9823083","url":null,"abstract":"<jats:p />","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135590572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Switching Delay Effects on Input-to-State Stability of Switched Systems 切换时滞对切换系统输入-状态稳定性的影响
4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-09-14 DOI: 10.1155/2023/2789626
Yuanyuan Jia, Jingjing Wang, Dongling Cui
{"title":"Switching Delay Effects on Input-to-State Stability of Switched Systems","authors":"Yuanyuan Jia, Jingjing Wang, Dongling Cui","doi":"10.1155/2023/2789626","DOIUrl":"https://doi.org/10.1155/2023/2789626","url":null,"abstract":"In this paper, input-to-state stability (ISS) is investigated for a class of nonlinear switched systems with time-varying switching delay, in which both ISS and non-ISS subsystems are considered simultaneously. By means of the Lyapunov function method, we show that ISS can be ensured for switched systems with time-varying switching delay if the activation time of ISS subsystems is sufficiently large and switching delays satisfy certain conditions. Moreover, inspired by (Zhang et al. 2020), a time-dependent multiple Lyapunov function is considered for linear switched systems with switching delay to obtain less conservative results, where the conservativeness can be reduced by explicitly providing the lower and upper bounds of switching intervals. Finally, simulations including an example of coordination of multiagent systems are offered to verify the effectiveness of the proposed results.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135552901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Jump Diffusion Model with Fast Mean-Reverting Stochastic Volatility for Pricing Vulnerable Options 易损期权定价的快速均值回归随机波动率跳跃扩散模型
4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-09-14 DOI: 10.1155/2023/2746415
Joy K. Nthiwa, Ananda O. Kube, Cyprian O. Omari
{"title":"A Jump Diffusion Model with Fast Mean-Reverting Stochastic Volatility for Pricing Vulnerable Options","authors":"Joy K. Nthiwa, Ananda O. Kube, Cyprian O. Omari","doi":"10.1155/2023/2746415","DOIUrl":"https://doi.org/10.1155/2023/2746415","url":null,"abstract":"The Black–Scholes–Merton option pricing model is a classical approach that assumes that the underlying asset prices follow a normal distribution with constant volatility. However, this assumption is often violated in real-world financial markets, resulting in mispricing and inaccurate hedging strategies for options. Such discrepancies may result into financial losses for investors and other related market inefficiencies. To address this issue, this study proposes a jump diffusion model with fast mean-reverting stochastic volatility to capture the impact of market price jumps on vulnerable options. The performance of the proposed model was compared under three different error distributions: normal, Student-t, and skewed Student-t, and under different market scenarios that consist of bullish, bearish, and neutral markets. In a simulation study, the results show that our model under skewed Student-t distribution performs better in pricing vulnerable options than the rest under different market scenarios. Our proposed model was fitted to S&amp;P 500 Index by maximum likelihood estimation for the mean and volatility processes and Gillespie algorithm for the jump process. The best model was selected based on AIC and BIC. Samples of the simulated values were compared with the S&amp;P 500 values and MSE computed at various sample sizes. Values of MSE at different sample sizes indicate significant decrease to actual MSE values demonstrating that it provides the best fit for modeling vulnerable options.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135552140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Testing Data Cloning as the Basis of an Estimator for the Stochastic Volatility in Mean Model 测试数据克隆作为均值模型随机波动估计的基础
4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-09-12 DOI: 10.1155/2023/7657430
E. Romero, E. Ropero-Moriones
{"title":"Testing Data Cloning as the Basis of an Estimator for the Stochastic Volatility in Mean Model","authors":"E. Romero, E. Ropero-Moriones","doi":"10.1155/2023/7657430","DOIUrl":"https://doi.org/10.1155/2023/7657430","url":null,"abstract":"Developed as a refinement of stochastic volatility (SV) models, the stochastic volatility in mean (SVM) model incorporates the latent volatility as an explanatory variable in both the mean and variance equations. It, therefore, provides a way of assessing the relationship between returns and volatility, albeit at the expense of complicating the estimation process. This study introduces a Bayesian methodology that leverages data-cloning algorithms to obtain maximum likelihood estimates for SV and SVM model parameters. Adopting this Bayesian framework allows approximate maximum likelihood estimates to be attained without the need to maximize pseudo likelihood functions. The key contribution this paper makes is that it proposes an estimator for the SVM model, one that uses Bayesian algorithms to approximate the maximum likelihood estimate with great effect. Notably, the estimates it provides yield superior outcomes than those derived from the Markov chain Monte Carlo (MCMC) method in terms of standard errors, all while being unaffected by the selection of prior distributions.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135826175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dual-Channel Decisions under Blockchain and Returns 区块链下的双渠道决策与收益
IF 1.4 4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-09-05 DOI: 10.1155/2023/5567263
Guangdong Liu, Ziyang Li, Jinggui Chen
{"title":"Dual-Channel Decisions under Blockchain and Returns","authors":"Guangdong Liu, Ziyang Li, Jinggui Chen","doi":"10.1155/2023/5567263","DOIUrl":"https://doi.org/10.1155/2023/5567263","url":null,"abstract":"Blockchain is currently used in a wide range of industries to improve the efficiency of the circulation of goods and effectively reduce counterfeiting in supply chains. In order to improve consumer trust in their purchases and reduce returns, the paper develops four models of consumers return based on blockchain technology from a consumer utility perspective. We conducted a Stackelberg game to analyze the impact of return modes and blockchain technology on optimal decisions and consumers, where consumers can return goods through the original channel, all through the online channel, and all through the offline channel. The major results of our study show that when blockchain technology is not used, the costs of return hassles in one channel can have an impact on other channels, and the adoption of online returns is advantageous to both consumers and the retailer. When blockchain technology is used, the manufacturer offers the retailer a lower wholesale price as a subsidy for the unit validation fee, which is always advantageous to the retailer. In most situations, implementing blockchain technology can boost consumer surplus. Only if the fixed cost of blockchain technology is low would the manufacturer adopt it.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49313845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hopf Bifurcation Analysis of a Continuous Investment Update Project Model 一个连续投资更新项目模型的Hopf分岔分析
IF 1.4 4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-08-31 DOI: 10.1155/2023/3457612
Debao Gao
{"title":"Hopf Bifurcation Analysis of a Continuous Investment Update Project Model","authors":"Debao Gao","doi":"10.1155/2023/3457612","DOIUrl":"https://doi.org/10.1155/2023/3457612","url":null,"abstract":"Some investment projects aim not only to produce goods but more importantly, to update and efficiently supply products in accordance with market demand. A double time delay differential dynamics model is formulated for continuous renewal investment projects based on the flowchart of the capital appreciation process and the assumed transfer functions. By analyzing the mathematical model, it can be determined that a unique local asymptotically stable positive equilibrium point exists for the continuous investment project. In accordance with the Hopf branching theorem, the model displays periodic behavior in proximity to its positive equilibrium point under certain conditions. The simulation results are compared under various conditions, and the validity of the relevant conclusions is confirmed.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49482219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Integrated Approach to Scheduling B-CAVs in Container Terminals considering Battery Management 考虑电池管理的集装箱码头b - cav综合调度方法
IF 1.4 4区 数学
Discrete Dynamics in Nature and Society Pub Date : 2023-08-25 DOI: 10.1155/2023/5566244
Shuo Wang, Jiliang Luo, Weimin Wu, Dahai Zhang, Tao Zhang
{"title":"An Integrated Approach to Scheduling B-CAVs in Container Terminals considering Battery Management","authors":"Shuo Wang, Jiliang Luo, Weimin Wu, Dahai Zhang, Tao Zhang","doi":"10.1155/2023/5566244","DOIUrl":"https://doi.org/10.1155/2023/5566244","url":null,"abstract":"With the aim of promoting environmental sustainability and enhancing transport efficiency, battery-powered connected and automated vehicles (B-CAVs) are employed to replace diesel-powered ones in horizontal transport systems (HTSs) of container terminals. The operational efficiency of an HTS can be increased by the cooperation of B-CAVs. However, it is time-consuming to charge them. Therefore, their battery management becomes a critical issue of a transport schedule. To run container terminals more economically and efficiently, this work proposes an integrated scheduling approach to B-CAVs tasks’ dispatch and route planning, where battery management is taken into account. An integer programming model is constructed with the goal of minimizing the total travel distance. Then, a sustainable charging policy is designed to ensure the consistent transport capacity of an HTS. Furthermore, a congestion-free path plan-based improved genetic algorithm is presented to obtain a near-optimal plan for dispatching B-CAVs to perform transporting and charging operations. A series of experiments are carried out to verify the effectiveness and efficiency of our approach.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48257769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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