Journal of Physics Complexity最新文献_第2页

Physical computing: a category theoretic perspective on physical computation and system compositionality 物理计算：从范畴论角度看物理计算和系统组合性

IF 2.7

Journal of Physics Complexity Pub Date : 2024-07-16 DOI: 10.1088/2632-072x/ad6051

Nima Dehghani and Gianluca Caterina

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Tuning the activation function to optimize the forecast horizon of a reservoir computer 调整激活函数以优化水库计算机的预测范围

IF 2.7

Journal of Physics Complexity Pub Date : 2024-07-11 DOI: 10.1088/2632-072x/ad5e55

L A Hurley, J G Restrepo and S E Shaheen

{"title":"Tuning the activation function to optimize the forecast horizon of a reservoir computer","authors":"L A Hurley, J G Restrepo and S E Shaheen","doi":"10.1088/2632-072x/ad5e55","DOIUrl":"https://doi.org/10.1088/2632-072x/ad5e55","url":null,"abstract":"Reservoir computing is a machine learning framework where the readouts from a nonlinear system (the reservoir) are trained so that the output from the reservoir, when forced with an input signal, reproduces a desired output signal. A common implementation of reservoir computers (RCs) is to use a recurrent neural network as the reservoir. The design of this network can have significant effects on the performance of the RC. In this paper we study the effect of the node activation function on the ability of RCs to learn and predict chaotic time series. We find that the Forecast Horizon (FH), the time during which the reservoir’s predictions remain accurate, can vary by an order of magnitude across a set of 16 activation functions used in machine learning. By using different functions from this set, and by modifying their parameters, we explore whether the entropy of node activation levels or the curvature of the activation functions determine the predictive ability of the reservoirs. We find that the FH is low when the activation function is used in a region where it has low curvature, and a positive correlation between curvature and FH. For the activation functions studied we find that the largest FH generally occurs at intermediate levels of the entropy of node activation levels. Our results show that the performance of RCs is very sensitive to the activation function shape. Therefore, modifying this shape in hyperparameter optimization algorithms can lead to improvements in RC performance.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"244 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141611722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics and sorting of run-and-tumble particles in fluid flows with transport barriers 有传输障碍的流体流动中翻滚颗粒的动力学和分拣

IF 2.7

Journal of Physics Complexity Pub Date : 2024-07-10 DOI: 10.1088/2632-072x/ad5bb2

Rafael Dias Vilela, Alfredo J Grados and Jean-Régis Angilella

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Modeling natural resources exploitation in low-information environments 低信息环境下的自然资源开发建模

IF 2.7

Journal of Physics Complexity Pub Date : 2024-07-04 DOI: 10.1088/2632-072x/ad5cb9

Silvia Muñoz-Álvarez, Carlos Gracia-Lázaro and Yamir Moreno

{"title":"Modeling natural resources exploitation in low-information environments","authors":"Silvia Muñoz-Álvarez, Carlos Gracia-Lázaro and Yamir Moreno","doi":"10.1088/2632-072x/ad5cb9","DOIUrl":"https://doi.org/10.1088/2632-072x/ad5cb9","url":null,"abstract":"The sustainable exploitation of natural resources constitutes a real-world problem of interest for many fields. In this work, we study those situations in which the exploiting agents have information about the state of the resource and their own benefits and costs but not about the behavior or performance of the rest of the agents. Cognitive Hierarchy Theory provides a framework for those low-information scenarios by focusing on the assumptions that agents make about other individuals’ behavior. Motivated by this theory, we introduce a theoretical agent-based model in which agents exhibit varying degrees of rationalization when exploiting the resource, and this resource’s evolution is driven by a differential equation that mirrors the dynamics of real-world resource growth. Our results show that, although most regimes imply depletion, higher benefits and sustainability are obtained when agents assume overexploitation by the rest and try to compensate for it. Furthermore, many exploiting agents and a long-term perspective also involve a better resource state, reaching the optimal exploitation level when all these factors come together.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"36 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The spectral boundary of block structured random matrices 块状结构随机矩阵的谱边界

IF 2.7

Journal of Physics Complexity Pub Date : 2024-07-04 DOI: 10.1088/2632-072x/ad5cba

Nirbhay Patil, Fabián Aguirre-López and Jean-Philippe Bouchaud

引用次数: 0

Exploring the interplay of technology, pro-family and prosocial behavior in settlement formation 探索定居形成过程中技术、亲家庭和亲社会行为的相互作用

IF 2.7

Journal of Physics Complexity Pub Date : 2024-06-20 DOI: 10.1088/2632-072x/ad577f

Carlos Gracia-Lázaro, Alexis R Hernández, Felipe Maciel-Cardoso and Yamir Moreno

{"title":"Exploring the interplay of technology, pro-family and prosocial behavior in settlement formation","authors":"Carlos Gracia-Lázaro, Alexis R Hernández, Felipe Maciel-Cardoso and Yamir Moreno","doi":"10.1088/2632-072x/ad577f","DOIUrl":"https://doi.org/10.1088/2632-072x/ad577f","url":null,"abstract":"We present an agent-based model that explores the intricate relationship between pro-family and prosocial behaviors and their impact on settlement formation. The objective is to investigate how the technological level and various constraints influence the transition from pro-family to prosocial behavior. The model incorporates factors such as the specialization requirements of the technology, societal tolerance, and dynamic interactions within a synthetic population, where individuals may prioritize either their family or their own settlement. Agents’ fitness is determined by two components: the proportion of pro-family agents within their family and the fraction of prosocial agents in their settlement, along with its size. Our findings reveal that (i) the technological level drives the transition from pro-family to prosocial behavior, and (ii) the developmental requirements of the technology shape the smoothness of this transition, ranging from abrupt to gradual. These results emphasize the significance of considering the interplay between the technological level, the nature of the technology, and cultural influences when examining settlement patterns and the dynamics of pro-family and prosocial behaviors in human societies.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"46 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141505703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hopf bifurcations of twisted states in phase oscillators rings with nonpairwise higher-order interactions 具有非成对高阶相互作用的相位振荡器环中扭曲态的霍普夫分岔

IF 2.7

Journal of Physics Complexity Pub Date : 2024-06-19 DOI: 10.1088/2632-072x/ad5635

Christian Bick, Tobias Böhle and Oleh E Omel’chenko

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Multifractal analysis of the perimeters of glaciers in the Svalbard Archipelago 斯瓦尔巴群岛冰川周缘的多分形分析

IF 2.7

Journal of Physics Complexity Pub Date : 2024-06-16 DOI: 10.1088/2632-072x/ad5263

Marina Carpineti, Valerio Lupo Sepe, Antonella Senese, Giacomo Traversa, Guglielmina A Diolaiuti and Alberto Vailati

{"title":"Multifractal analysis of the perimeters of glaciers in the Svalbard Archipelago","authors":"Marina Carpineti, Valerio Lupo Sepe, Antonella Senese, Giacomo Traversa, Guglielmina A Diolaiuti and Alberto Vailati","doi":"10.1088/2632-072x/ad5263","DOIUrl":"https://doi.org/10.1088/2632-072x/ad5263","url":null,"abstract":"The investigation of the evolution of glaciers largely relies on the characterisation of extensive quantities like their mass, area, and perimeter. In this work we use fractal and multifractal analysis to investigate the non-extensive structural properties of the perimeters of glaciers in the Svalbard Archipelago. We show that the perimeters of the glaciers exhibit a fractal structure with a fractal dimension , independently from the area of the glaciers. The investigation of the multifractal properties of the perimeters shows that small glaciers exhibit a more pronounced multifractal structure, as witnessed by the larger range of generalized dimensions Dq needed to characterise them. The range ΔDq of generalised dimensions required to characterise the multifractal perimeter of a glacier exhibits a power-law dependence with exponent −1.2 from the area, and represents a non-extensive parameter able to grab effectively the dependence of the multifractal structure of the perimeters on the size of glaciers. The comparison with similar results obtained in a previous study performed on glaciers in the Lombardy region of the Italian Alps confirms the robustness of the analysis performed, which does not appear to be affected by the morphology of the substrate or by climate conditions.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"20 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141505759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lyapunov analysis of data-driven models of high dimensional dynamics using reservoir computing: Lorenz-96 system and fluid flow 利用储层计算对数据驱动的高维动力学模型进行李亚普诺夫分析：洛伦兹-96 系统和流体流动

IF 2.7

Journal of Physics Complexity Pub Date : 2024-06-16 DOI: 10.1088/2632-072x/ad5264

Miki U Kobayashi, Kengo Nakai and Yoshitaka Saiki

引用次数: 0

Economic complexity and the sustainability transition: a review of data, methods, and literature 经济复杂性和可持续性转型：数据、方法和文献综述

IF 2.7

Journal of Physics Complexity Pub Date : 2024-06-16 DOI: 10.1088/2632-072x/ad4f3d

Bernardo Caldarola, Dario Mazzilli, Lorenzo Napolitano, Aurelio Patelli and Angelica Sbardella

{"title":"Economic complexity and the sustainability transition: a review of data, methods, and literature","authors":"Bernardo Caldarola, Dario Mazzilli, Lorenzo Napolitano, Aurelio Patelli and Angelica Sbardella","doi":"10.1088/2632-072x/ad4f3d","DOIUrl":"https://doi.org/10.1088/2632-072x/ad4f3d","url":null,"abstract":"Economic Complexity (EC) methods have gained increasing popularity across fields and disciplines. In particular, the EC toolbox has proved particularly promising in the study of complex and interrelated phenomena, such as the transition towards a more sustainable economy. Using the EC approach, scholars have been investigating the relationship between EC and sustainability, and identifying the distinguishing characteristics of green activities and to assess the readiness of productive and technological structures for the sustainability transition. This article proposes to review and summarize the data, methods, and empirical literature that are relevant to the study of the sustainability transition from an EC perspective. We review three distinct but connected blocks of literature on EC and environmental sustainability. First, we survey the evidence linking measures of EC to indicators related to environmental sustainability. Second, we review articles that strive to assess the green competitiveness of productive systems. Third, we examine evidence on green technological development and its connection to non-green knowledge bases. Finally, we summarize the findings for each block, while identifying criticalities and avenues for further research in this recent and growing body of empirical literature.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"13 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141505761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0