Complexity最新文献_第8页

Investigating Global Stability and Bifurcation in an Ecological Dynamical System 研究生态动态系统中的全局稳定性和分岔问题

IF 2.3 4区工程技术

Complexity Pub Date : 2024-06-05 DOI: 10.1155/2024/4970657

Muhammad Salman Khan, Rizwan Niaz, Mohammed Ahmed Alomair, Mohamed Hussien

引用次数: 0

Determination of Novel Estimations for the Slater Difference and Applications 确定斯莱特差值的新估算值及其应用

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-30 DOI: 10.1155/2024/8481103

Muhammad Adil Khan, Hidayat Ullah, Tareq Saeed, Zaid M. M. M. Sayed, Salha Alshaikey, Emad E. Mahmoud

引用次数: 0

Design and Implementation of a Hybrid-Driven Soft Robot 混合动力软机器人的设计与实现

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-29 DOI: 10.1155/2024/7624799

Ke Zhang, Yongqi Bi, Ruiyu Zhang

{"title":"Design and Implementation of a Hybrid-Driven Soft Robot","authors":"Ke Zhang, Yongqi Bi, Ruiyu Zhang","doi":"10.1155/2024/7624799","DOIUrl":"10.1155/2024/7624799","url":null,"abstract":"<div>\u0000 <p>Currently, soft robots alone cannot obtain the same operating speed as rigid robots, while rigid robots are not safe enough for human-robot interaction. To address this problem, this paper describes a hybrid robot system that combines both rigid and flexible systems for unknown domain exploration. The system consists of a four-wheeled robot chassis and a cylindrical pneumatic soft actuator, and finally, a computer is used to coordinate and control both. The hardware of the robot system is designed, a bending motion model is proposed, and SOFA framework is used to carry out finite element simulation (FEM) to verify the reasonableness of the design; linear motion speeds of up to 0.5 m/s, higher than the existing soft robots investigated, were verified experimentally separately after carrying the new module, and steering ability was retained; and the robot carrying the navigation module is verified to have a certain map building and localization function through the construction of the simultaneous localization and mapping (SLAM) experimental platform. The hybrid robot introduced in this paper can move quickly on flat terrain and can use its soft part to avoid wear and tear.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/7624799","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141166307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stability Evaluation of Slope Based on Global Sensitivity Analysis 基于全局敏感性分析的斜坡稳定性评估

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-21 DOI: 10.1155/2024/2333859

Zhaoxia Xu, Xiuzhen Wang, Lu Guo, Teng Yu

{"title":"Stability Evaluation of Slope Based on Global Sensitivity Analysis","authors":"Zhaoxia Xu, Xiuzhen Wang, Lu Guo, Teng Yu","doi":"10.1155/2024/2333859","DOIUrl":"10.1155/2024/2333859","url":null,"abstract":"<div>\u0000 <p>The uncertainty of parameters will have a significant impact on slope stability, where sensitivity analysis is a commonly used method in uncertainty research. However, traditional sensitivity analysis method costs much computation time. When calculating the sensitivity index of one parameter, all other parameters are taken as fixed values, and the uncertainty of all parameters cannot be considered simultaneously. Therefore, the variance-based and the moment-independent global sensitivity analysis (GSA) methods are both introduced to determine the influence of geotechnical parameters on slope stability in this study. To solve the importance index of GSA, the least angle regression algorithm, the kernel density estimation, and orthogonal polynomial estimation methods are developed to obtain variance-based importance index and the moment-independent importance index, respectively. The proposed methods allow all variables to change simultaneously within their variation range and have high computational efficiency. The results are in good at with those obtained by the variance-based Monte Carlo simulation method, which is considered as the exact solution forobtaining the importance index. The influence of the correlation between the shear strength parameters (<i>c</i> and <i>φ</i>) on the importance index is also studied, which indicates that the negative correlation will have a great impact on the importance index, which in turn affects the safety assessment of slope. Three engineering cases have been studied for engineering application, and the compared results indicate that the impact of the geotechnical parameters uncertainty on the safety factor (<i>Fs</i>) and failure probability (<i>p</i><sub><i>f</i></sub>) are different. Therefore, the approaches based on GSA which can integrate the <i>F</i>s with <i>p</i><sub><i>f</i></sub> will be a promising approach for slope stability evaluation.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/2333859","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141115905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Behaviour Analysis of Modeling and Model Evaluating Methods in System Identification for a Multiprocess Station 多工序站系统识别中建模和模型评估方法的行为分析

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-20 DOI: 10.1155/2024/7741473

A. Annie Steffy Beula, Geno Peter, Albert Alexander Stonier, K. Ezhil Vignesh, Vivekananda Ganji

{"title":"Behaviour Analysis of Modeling and Model Evaluating Methods in System Identification for a Multiprocess Station","authors":"A. Annie Steffy Beula, Geno Peter, Albert Alexander Stonier, K. Ezhil Vignesh, Vivekananda Ganji","doi":"10.1155/2024/7741473","DOIUrl":"10.1155/2024/7741473","url":null,"abstract":"<div>\u0000 <p>Systems are designed to perform specific task by giving certain input which produces the required output in an orderly manner known as process. The input, output, and the state variables should be known that will help in interacting with the system. The relation between these variables can be brought out by building a model that resembles or expresses the original performance of the system. The parameters of the model are estimated using the least squares approximation, maximum likelihood, maximum log-likelihood, and Bayesian parameter estimation methods by utilizing the experimental data from the multiprocess station. The selected parameters are converted to nine different transfer function models that represent the given dynamic system. The models framed are analyzed by the criterion curve technique using seven criterion functions evaluating the fitness of the model. Order of the model is found from Hankel matrix representation methods such as singular value decomposition and determinant method. Response of the models is compared with the original response to choose the best fit model by calculating ISE standard. All the above methods are used to model the system without physical and theoretical laws which is known as system identification.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/7741473","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141120631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Utilizing the Optimal Auxiliary Function Method for the Approximation of a Nonlinear Long Wave System considering Caputo Fractional Order 利用最优辅助函数法近似考虑卡普托分数阶的非线性长波系统

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-20 DOI: 10.1155/2024/8357221

Aaqib Iqbal, Rashid Nawaz, Hina Hina, Abdulaziz Garba Ahmad, Homan Emadifar

{"title":"Utilizing the Optimal Auxiliary Function Method for the Approximation of a Nonlinear Long Wave System considering Caputo Fractional Order","authors":"Aaqib Iqbal, Rashid Nawaz, Hina Hina, Abdulaziz Garba Ahmad, Homan Emadifar","doi":"10.1155/2024/8357221","DOIUrl":"10.1155/2024/8357221","url":null,"abstract":"<div>\u0000 <p>In this article, we explore the utilization of the Caputo derivative and the Riemann–Liouville (R–L) fractional integral to analyze the optimal auxiliary function method for approximating fractional nonlinear long waves. Approximate long wave equation with a distinct dispersion relation offers the most accurate description of shallow water wave properties. Various methods, including the Adomian decomposition technique, the variational iteration method, the optimum homotopy asymptotic method, and the new iterative technique, have been employed and compared to those obtained using the fractional-order approximate long wave equation. The results of our study indicate that the optimal auxiliary function method is highly successful and practically simple, achieving better and more rapid convergence after just one repetition. This method is recognized as an efficient approach, demonstrating high precision in solving intriguing and intricate problems. Furthermore, it proves to be more time and resource efficient than other relevant analytical techniques, leading to significant savings in both volume and time. Compared to the Adomian decomposition technique, the new iterative technique, the variational iteration method, and the optimum homotopy asymptotic method, the suggested technique is extremely accurate computationally. It is also easy to analyze and solve fractionally linked nonlinear complex phenomena that arise in science and technology. We present the numerical and graphical findings that support these conclusions.</p>\u0000 </div>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2024/8357221","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141119477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Image Robust Watermarking Method Based on DWT-SVD Transform and Chaotic Map 基于 DWT-SVD 变换和混沌图的图像鲁棒水印方法

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-15 DOI: 10.1155/2024/6618382

Weishuai Wu, Yujiao Dong, Guangyi Wang

{"title":"Image Robust Watermarking Method Based on DWT-SVD Transform and Chaotic Map","authors":"Weishuai Wu, Yujiao Dong, Guangyi Wang","doi":"10.1155/2024/6618382","DOIUrl":"10.1155/2024/6618382","url":null,"abstract":"<p>The existing watermarking algorithms make it difficult to balance the invisibility and robustness of the watermark. This paper proposes a robust image watermarking method based on discrete wavelet transform (DWT), singular value decomposition (SVD), and chaotic maps. This method is a semiblind watermarking method. First, a chaotic logistic-tent map is introduced, employing an extensive chaotic parameter domain. This map is amalgamated with Arnold’s transformation to encrypt the watermark image, thereby bolstering the security of the watermark information. Subsequently, the frequency domain is obtained by applying DWT to the carrier image. Embedding watermarks in the frequency domain ensures the invisibility of the watermark, with a preference for a high-frequency subband after the DWT of the carrier image for enhanced watermark robustness. SVD is then applied to both the high-frequency subband of the carrier image after DWT and the encrypted watermark image. The final step involves embedding the singular values of the encrypted watermark image into the carrier image’s singular values, thereby completing the watermark information embedding process. In simulation experiments, an invisibility test was conducted on various carrier images, yielding peak signal-to-noise ratio (PSNR) values consistently exceeding 43, and structural similarity (SSIM) close to 1. Robustness testing against various types of attacks resulted in normalized correlation (NC) values consistently surpassing 0.9, with bit error rate (BER) values approaching 0. In conclusion, the proposed algorithm satisfies imperceptibility requirements while demonstrating formidable robustness.</p>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140977413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Structure of Lexical-Semantic Networks at Global and Local Levels: A Comparison between L1 and L2 词汇-语义网络在整体和局部层面的结构：L1 和 L2 的比较

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-14 DOI: 10.1155/2024/8644384

Xuefang Feng, Jie Liu

{"title":"The Structure of Lexical-Semantic Networks at Global and Local Levels: A Comparison between L1 and L2","authors":"Xuefang Feng, Jie Liu","doi":"10.1155/2024/8644384","DOIUrl":"10.1155/2024/8644384","url":null,"abstract":"<p>This article applies quantitative methods from complex network analysis to investigate and compare the organization of L1 and L2 lexical-semantic networks. Forty-eight English learners with Chinese as their native language completed a semantic fluency task, first in English and then in Chinese, based on which two lexical-semantic networks were constructed. Comparison at the global level found that the L1 lexical-semantic network displays more prominent small-world and scale-free features and a clearer modular structure in comparison with its L2 counterpart. Locally, although the two lexical-semantic networks share most of their central words, they differ remarkably in their composition and the connection pattern of their peripheral words. Specifically, L1 peripheral words are likely to connect with each other to form local modules while L2 peripheral words tend to connect with central words. Moreover, word centrality was found to be closely related to time of generation, generation frequency, and accuracy in fluency tasks, and such tendency is more obvious in L1 than in L2. The findings demonstrate the advantages of quantitative analysis granted by network science in the investigation of mental lexicon and provide insights for lexical representation research and classroom vocabulary instructions.</p>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140936894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing the Efficiency and Potential of China’s Apple Exports 评估中国苹果出口的效率和潜力

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-07 DOI: 10.1155/2024/7816792

Biao Ke, Qiangqiang Zhang

{"title":"Assessing the Efficiency and Potential of China’s Apple Exports","authors":"Biao Ke, Qiangqiang Zhang","doi":"10.1155/2024/7816792","DOIUrl":"10.1155/2024/7816792","url":null,"abstract":"<p>This study elucidates the factors impacting China’s apple trade, its efficiency, and opportunities for increased revenue. This study adopts a stochastic frontier gravity model on China’s apple exports data, covering the period from 1997 to 2022 across 38 significant trading partners. The finding demonstrates that the economic growth of China and its trading partners substantially boosts apple export volumes, with a positive correlation between GDP growth and export flows. The research also highlights the deterrent effect of geographical distance on exports and reveals a complex negative relationship between the per capita GDP of importing nations and export efficiency, shedding light on the nuanced nature of trade dynamics. Furthermore, the study finds that the appreciation of China’s currency plays a crucial role in enhancing export efficiency by lowering transaction costs. Meanwhile, increased agricultural land in importing countries presents competitive challenges, impacting export performance negatively. Geographical proximity and infrastructural features, such as shared borders and lack of access to seaport, are identified as significant factors in export efficiency. The analysis unveils considerable untapped export potential in various countries, suggesting a strategic avenue for market expansion. To optimize China’s apple export strategy, policymakers are advised to consider currency management, negotiate trade agreements that mitigate distance and per capita GDP effects, and target markets with high untapped potential, thereby facilitating sustainable growth in China’s apple export sector.</p>","PeriodicalId":50653,"journal":{"name":"Complexity","volume":"2024 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141003716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Trajectory Tracking Nonlinear Hybrid Control of Automated Guided Vehicles 自动制导车辆的轨迹跟踪非线性混合控制

IF 2.3 4区工程技术

Complexity Pub Date : 2024-05-06 DOI: 10.1155/2024/9514486

Antonio Sánchez-Rodríguez, Eduardo Bayona, J. Enrique Sierra-García, Matilde Santos

引用次数: 0