Discrete Dynamics in Nature and Society最新文献_第2页

Carbon Market Efficiency and Economic Policy Uncertainty: Evidence from a TVP-VAR Model 碳市场效率与经济政策不确定性：来自 TVP-VAR 模型的证据

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-04-15 DOI: 10.1155/2024/9892400

Min Liu, Rong Huang, Yang Lu

{"title":"Carbon Market Efficiency and Economic Policy Uncertainty: Evidence from a TVP-VAR Model","authors":"Min Liu, Rong Huang, Yang Lu","doi":"10.1155/2024/9892400","DOIUrl":"https://doi.org/10.1155/2024/9892400","url":null,"abstract":"This paper examines the dynamic linkages among economic policy uncertainty (EPU), the green bond market, the carbon market, and the macroeconomy using the time-varying parameter vector autoregressive (TVP-VAR) model with monthly data spanning from January 2016 to December 2021. Additionally, it assesses the robustness and accuracy of the empirical results through the Bayesian vector autoregressive (BVAR) model. The findings indicate that EPU negatively affects the green bond market in the short term but has a positive impact in the medium and long term. Conversely, EPU has a positive impact on the carbon market in the short term but a negative impact in the medium and long term. Furthermore, the green bond market negatively influences the carbon market in both the short and medium to long term. These results suggest that emerging markets, such as the green bond and carbon markets, are influenced by EPU. The adverse impact of the green bond market on the carbon market, however, contributes to expediting China’s attainment of its low-carbon objectives. Appropriate economic policies can play a vital role in accelerating the transition to a low-carbon economy. The study also reveals that the US-China trade war has expedited the development of green capital markets in China, despite its impact on the green economic transition in the country. These findings provide insights for the government and investors to formulate suitable strategies for risk mitigation.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140703928","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

Global Flow of Foreign Aid and Change in Recipients’ Local Labor Institutions 外国援助的全球流动与受援国当地劳工机构的变化

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-04-09 DOI: 10.1155/2024/1147752

Shuzhen Niu, Xiang Gao, Zhenhua Gu, Yingchao Zhang, Qian Wei

{"title":"Global Flow of Foreign Aid and Change in Recipients’ Local Labor Institutions","authors":"Shuzhen Niu, Xiang Gao, Zhenhua Gu, Yingchao Zhang, Qian Wei","doi":"10.1155/2024/1147752","DOIUrl":"https://doi.org/10.1155/2024/1147752","url":null,"abstract":"How does foreign aid affect recipient countries’ labor institutions? Extant empirical evidence is sparse due to ambiguous theoretical predictions and potential endogeneity issues. This study uses data detailing aid flow and institutional functions to mitigate such inconclusiveness and displays originality by constructing a concise theoretical framework in which foreign aid contributes to the improvement of the labor institutions in recipient countries through two mechanisms—economic growth purpose and expected aid attraction. The findings indicate that only aid to enhance local economic growth provides incentives to change domestic labor markets. Such effects have a more crucial influence on labor institutions of minimum wage, collective bargaining rights, and working hours than those related to hiring and firing regulations, mandated costs for worker dismissal, and conscription. For comparison with the actual aid level, we construct forecasted proxies to capture exogenous fluctuations in aid, determining that domestic labor markets can also change via a novel mechanism, as the recipient voluntarily mimics the funder’s labor policies in anticipation of receiving future aid, with exact amounts derived from the noninstitutional characteristics of pairs of bilateral recipient and giver economies. Therefore, we provide policy implications for the aid giver on how to secure a continued and increased aid flow and for the aid receivers on which aspects of reforming measures are most effective in enhancing the labor market regulations.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140578061","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

Price-Volume Relationship in Bitcoin Futures ETF Market: An Information Perspective 比特币期货 ETF 市场的价量关系：信息视角

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-03-31 DOI: 10.1155/2024/8066742

Xudong Wang, Xiaofeng Hui

引用次数: 0

A Model for the Propagation and Control of Pulmonary Tuberculosis Disease in Kenya 肯尼亚肺结核病传播与控制模型

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-03-31 DOI: 10.1155/2024/5883142

Erick Mutwiri Kirimi, G. Muthuri, C. Ngari, Stephen Karanja

{"title":"A Model for the Propagation and Control of Pulmonary Tuberculosis Disease in Kenya","authors":"Erick Mutwiri Kirimi, G. Muthuri, C. Ngari, Stephen Karanja","doi":"10.1155/2024/5883142","DOIUrl":"https://doi.org/10.1155/2024/5883142","url":null,"abstract":"Pulmonary tuberculosis is among the leading infectious diseases causing mortality worldwide. Therefore, scaling up intervention strategies to reduce the spread of infections in the population is imperative. In this paper, a population-based compartmental approach has been employed to formulate a mathematical model of pulmonary tuberculosis that incorporates an asymptomatic infectious population. The model includes asymptomatic infectious individuals since they spread infections incessantly to susceptible populations without being noticed, thus contributing to the high rate of infection transmission. Qualitative and numerical analyses were performed to determine the impact of various intervention strategies on controlling infection transmission in the population. Sensitivity and numerical results indicate that increasing screening of latently infected and asymptomatic infectious individuals reduces infection transmission to the susceptible population. Numerical results demonstrate that the combination of vaccination, screening, and treatment of all forms of pulmonary tuberculosis is the most effective intervention in decreasing infection transmission. Furthermore, a combination of screening and treatment of all forms of pulmonary tuberculosis proves more effective than a combination of vaccination and treatment of symptomatic infectious individuals alone. Treating the symptomatic infectious population alone is identified as the least effective intervention for curtailing infection transmission in the susceptible population. These study findings will guide healthcare officials in making decisions regarding the screening of latently infected and asymptomatic infectious pulmonary tuberculosis patients, thereby aiding in the fight against epidemics of this disease.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140359642","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

Bézier Cubics and Neural Network Agreement along a Moderate Geomagnetic Storm 贝塞尔立方体与神经网络在中度地磁暴中的一致性

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-03-26 DOI: 10.1155/2024/3559969

Emre Eroglu, Mehmet Emir Koksal

{"title":"Bézier Cubics and Neural Network Agreement along a Moderate Geomagnetic Storm","authors":"Emre Eroglu, Mehmet Emir Koksal","doi":"10.1155/2024/3559969","DOIUrl":"https://doi.org/10.1155/2024/3559969","url":null,"abstract":"The discussion models the IRI-2012 TEC map over a moderate geomagnetic storm period (5 days) in February 2015 and compares the yield of the models. The models are constructed with the help of cubic Bézier curves and machine learning. In a sense, the comparison of a classical and mechanical approach with a modern and computer-based one is a considerable experience for the paper. The parametric curve approach governs models of piecewise continuous Bézier cubics, while the models employ only the TEC map. The design is separated into curve components at every five-hour curvature point, and each component is handled independently. Instead of the traditional least squares method for finding control points of cubics, it utilizes the mean of every five-hour of the piecewise curves of the TEC data. Accordingly, the prediction error can be controlled at a rate that can compete with the modern network approach. In the network model, 120 hours of the solar wind parameters and the TEC map of the storm are processed. The reliability of the network model is assessed by the (R) correlation coefficient and mean square error. In modeling the TEC map with the classical approach, the mean absolute error is 0.0901% and the correlation coefficient (R) score is 99.9%. The R score of the network model is 99.6%, and the mean square error is 0.71958 (TECU) (at epoch 47). The results agree with the literature.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140322170","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

Dynamic Analysis of a Simple Cournot Duopoly Model Based on a Computed Cost 基于计算成本的简单库诺二元垄断模型的动态分析

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-03-25 DOI: 10.1155/2024/9912671

S. S. Askar, Ahmad M. Alshamrani

{"title":"Dynamic Analysis of a Simple Cournot Duopoly Model Based on a Computed Cost","authors":"S. S. Askar, Ahmad M. Alshamrani","doi":"10.1155/2024/9912671","DOIUrl":"https://doi.org/10.1155/2024/9912671","url":null,"abstract":"The paper is organized to study some mathematical properties and dynamics of a simple Cournot duopoly game based on a computed quadratic cost. The time evolution of this game is described by a two-dimensional noninvertible discrete time map using the bounded rationality mechanism. For this map, some dynamic characteristics such as multistability and synchronization are investigated. Its equilibrium points are obtained for the asymmetric case, and their conditions of stability are obtained. Our results investigate that the Nash equilibrium point may be unstable due to flip bifurcation and under certain parameter values, and Neimark–Sacker bifurcation is born after the period-4 cycle. Through some restrictions, the coordinate axes of the map construct an invariant manifold, and therefore, their dynamics can be analyzed by using a one-dimensional map. In the symmetric case, both firms behave identically, and this implies that the diagonal set forms an invariant manifold, and hence the synchronization phenomena take place. Furthermore, the global bifurcation of the map is confirmed through contact between critical curves and the boundaries of infeasible domains.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140302673","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

Decision Support System for Single-Valued Neutrosophic Aczel–Alsina Aggregation Operators Based on Known Weights 基于已知权重的单值中性 Aczel-Alsina 聚合算子决策支持系统

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-03-20 DOI: 10.1155/2024/4362151

Sajid Latif, Kifayat Ullah, Abrar Hussain, Amrullah Awsar

{"title":"Decision Support System for Single-Valued Neutrosophic Aczel–Alsina Aggregation Operators Based on Known Weights","authors":"Sajid Latif, Kifayat Ullah, Abrar Hussain, Amrullah Awsar","doi":"10.1155/2024/4362151","DOIUrl":"https://doi.org/10.1155/2024/4362151","url":null,"abstract":"Multiattribute decision making (MADM) approach is a well-known decision-making process utilized in a variety of fields such as solid waste management, renewable energy resources, air quality assurance, hotel location decision, sustainable supplier selection, partner recognition, green supplier enterprises, game theory, construction development authority, and weapon group target estimation. The aggregation operators (AOs) are essential components of the decision-making process and have a great capability to deal with ambiguous and unpredictable information in the different fields of fuzzy environments. In this article, we expressed the theory concepts of single-valued neutrosophic (SVN) sets (SVNS) and also characterized their basic operations. The power aggregation tools are allowed to input arguments to support each other among different arguments. Recently, Aczel–Alisna aggregation tools conquered great attention from several research scholars. We also exposed some reliable operations of Aczel–Alsina aggregation models under the consideration of SVN information. We established a series of new approaches, including the “single-valued neutrosophic Aczel–Alsina power weighted average” (SVNAAPWA) operator and “single-valued neutrosophic Aczel–Alsina power weighted geometric” (SVNAAPWG) operators. To show the effectiveness and compatibility of derived approaches, some prominent characteristics are also established. We constructed a MADM technique to solve an application of engineering and construction materials under consideration of our derived methodologies. An experimental case study is also presented to determine a suitable optimal option from a group of options. To find the flexibility of our proposed work, we provided a comparative study that compares the results of existing AOs with our proposed work. A comprehensive overview is also presented here.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140171758","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

Impact of Corporate Social Responsibility on Operations of a Live-Streaming Supply Chain 企业社会责任对直播供应链运营的影响

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-03-19 DOI: 10.1155/2024/2855251

Suqin Sun, Haodong Zheng, Tao Hang, Xuemei Zhang

{"title":"Impact of Corporate Social Responsibility on Operations of a Live-Streaming Supply Chain","authors":"Suqin Sun, Haodong Zheng, Tao Hang, Xuemei Zhang","doi":"10.1155/2024/2855251","DOIUrl":"https://doi.org/10.1155/2024/2855251","url":null,"abstract":"Corporate social responsibility (CSR) is widely noticed as an essential tool for business operation and sustainable development. Meanwhile, the fiercely competitive external environment and unpredictable events prompt enterprises’ cooperation to prevent supply chain collapse. We investigate the cooperative strategy in a live-streaming supply chain (LSC) consisting of a dominant brand owner, a retailer, and a live streamer, where the brand owner considers CSR by considering the welfare of stakeholders. We construct one non-cooperative and three cooperative Stackelberg game models to explore the impact of CSR on cooperative strategy and LSC operations. The results show the following. (1) When the brand owner considers CSR, LSC members and systems are more profitable in the four models than when the brand owner does not consider CSR. (2) When the flow effect is small, the brand owner tends to cooperate with the retailer; otherwise, the brand owner prefers to cooperate with the live streamer. (3) The grand coalition C (the brand owner cooperates with the retailer and live streamer) is the consistent strategy for the LSC system, consumers, and society. These findings help enterprises recognize the importance of CSR and collaboration, thus further providing reference opinions on engaging in CSR and how to achieve collaboration.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140171761","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

Numerical Analysis and Computation of a Subgrid-Sparse-Grad-Div Stabilization Method for Incompressible Flow Problems 针对不可压缩流问题的子网格-解析-梯度-密度稳定方法的数值分析与计算

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-03-13 DOI: 10.1155/2024/5580918

Yun-Bo Yang, Bin-Chao Huang

引用次数: 0

Deep Reinforcement Learning and Auto-Differential Evolution Co-Guided Coal Washing 深度强化学习和自差分进化协同引导洗煤

IF 1.4 4区数学

Discrete Dynamics in Nature and Society Pub Date : 2024-03-12 DOI: 10.1155/2024/7843835

Mingcheng Zuo

{"title":"Deep Reinforcement Learning and Auto-Differential Evolution Co-Guided Coal Washing","authors":"Mingcheng Zuo","doi":"10.1155/2024/7843835","DOIUrl":"https://doi.org/10.1155/2024/7843835","url":null,"abstract":"Background. Coal washing is a complicated process and difficult to control, which has many controlling parameters with strong coupling relationship. It is still a challenge to realize the self-perception, self-adjustment, and self-evaluation of coal washing machine, improve the quality of coal washing, ensure production safety, and reduce labor cost. Methods. Through the intelligent transformation of jig, this paper proposes an intelligent washing method with cooperated deep reinforcement learning and evolutionary computation. First, it designs a fault warning method based on statistical analysis, helping to recover the normal running state of jig with manual maintenance. Then, it constructs a regulation strategy generation method with deep reinforcement learning supported by the fusion of artificial experience and historical data. Last, for the lack of monitoring data caused by poor communication quality and environment, the regulation strategy prediction method with evolutionary computation and surrogate model is proposed. Results. In practice, this method shows accurate fault warning accuracy and rapid cleaned coal ash adjustment response ability. Conclusions. This shows that the method proposed in this paper is of great significance for intelligent washing and can better cope with the special situation when the washing equipment sensing data are missing.","PeriodicalId":55177,"journal":{"name":"Discrete Dynamics in Nature and Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140106142","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