Journal of Physics Complexity最新文献_第6页

Quantifying the hierarchical adherence of modular documents 量化模块化文件的层级一致性

IF 2.7

Journal of Physics Complexity Pub Date : 2023-11-23 DOI: 10.1088/2632-072x/ad0a9b

Alexandre Benatti, Ana C M Brito, Diego R Amancio, Luciano da F Costa

{"title":"Quantifying the hierarchical adherence of modular documents","authors":"Alexandre Benatti, Ana C M Brito, Diego R Amancio, Luciano da F Costa","doi":"10.1088/2632-072x/ad0a9b","DOIUrl":"https://doi.org/10.1088/2632-072x/ad0a9b","url":null,"abstract":"Several natural and artificial structures are characterized by an intrinsic hierarchical organization. The present work describes a methodology for quantifying the degree of adherence between a given hierarchical template and a respective modular document (e.g. books or homepages with content organized into modules) organized as a respective content network. The original document, which in the case of the present work concerns Wikipedia pages, is transformed into a respective content network by first dividing the document into parts or modules. Then, the contents (words) of each pair of modules are compared in terms of the coincidence similarity index, yielding a respective weight. The adherence between the hierarchical template and the content network can then be measured by considering the coincidence similarity between the respective adjacency matrices, leading to the respective hierarchical adherence index. In order to provide additional information about this adherence, four specific indices are also proposed, quantifying the number of links between non-adjacent levels, links between nodes in the same level, converging links between adjacent levels, and missing links. The potential of the approach is illustrated respectively to model-theoretical networks as well as to real-world data obtained from Wikipedia. In addition to confirming the effectiveness of the suggested concepts and methods, the results suggest that real-world documents do not tend to substantially adhere to respective hierarchical templates.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"106 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138692981","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

Encapsulation Structure and Dynamics in Hypergraphs 超图中的封装结构和动力学

Journal of Physics Complexity Pub Date : 2023-11-09 DOI: 10.1088/2632-072x/ad0b39

Timothy LaRock, Renaud Lambiotte

引用次数: 3

Impact of tropical teleconnections on the long-range predictability of the atmosphere at midlatitudes: A reduced-order multi-scale model perspective 热带遥相关对中纬度大气长期可预测性的影响:一个降阶多尺度模式视角

Journal of Physics Complexity Pub Date : 2023-10-19 DOI: 10.1088/2632-072x/ad04e8

Stephane VANNITSEM

{"title":"Impact of tropical teleconnections on the long-range predictability of the atmosphere at midlatitudes: A reduced-order multi-scale model perspective","authors":"Stephane VANNITSEM","doi":"10.1088/2632-072x/ad04e8","DOIUrl":"https://doi.org/10.1088/2632-072x/ad04e8","url":null,"abstract":"Abstract Teleconnections between the tropical and the extratropical climates are often considered as a potential source of long-term predictability at seasonal to decadal time scales in the extratropics. This claim is taken up in the present work by investigating the predictability of a coupled ocean-atmosphere extratropical model under a one-way forcing generated by a tropical model. Both models display a chaotic dynamics, and the dominant variable of the extratropical model displays a high correlation with the tropical forcing in the reference simulation, inducing a low-frequency variability signal in the extratropics. &#xD;&#xD;Numerical experiments emulating the presence of initial condition errors in the tropical model are conducted to clarify their impact on the predictability in the extratropics. It is shown that: (i) The correlation skill of the dominant observable affected by the forcing is considerably degraded at interannual time scales due to the presence of initial condition errors in the tropics, considerably limiting the potential of teleconnections; (ii) averaging of an ensemble of forecasts -- with a small number of members -- may substantially improve the quality of the forecasts; and (iii) temporal averaging may also improve the quality of the forecasts (at the expense of being able to forecast extreme events), in particular when the forcing affects weakly the observable under interest.&#xD;","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"277 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135728803","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

Disorder Unleashes Panic in Bitcoin Dynamics 混乱引发比特币动态恐慌

Journal of Physics Complexity Pub Date : 2023-10-17 DOI: 10.1088/2632-072x/ad00f7

Marco Alberto Javarone, Gabriele Di Antonio, Gianni Valerio Vinci, Raﬀaele Cristodaro, Claudio J. Tessone, Luciano Pietronero

引用次数: 3

Assessing the impact of Byzantine attacks on coupled phase oscillators 评估拜占庭攻击对耦合相位振荡器的影响

Journal of Physics Complexity Pub Date : 2023-10-16 DOI: 10.1088/2632-072x/ad0390

Melvyn Tyloo

引用次数: 0

Modeling interdisciplinary interactions among Physics, Mathematics and Computer Science 模拟物理、数学和计算机科学之间的跨学科互动

Journal of Physics Complexity Pub Date : 2023-10-13 DOI: 10.1088/2632-072x/ad0017

Rima Hazra, Mayank Singh, Pawan Goyal, Bibhas Adhikari, Animesh Mukherjee

引用次数: 0

Evolution of cooperation driven by sampling reward 抽样奖励驱动下的合作进化

Journal of Physics Complexity Pub Date : 2023-10-10 DOI: 10.1088/2632-072x/ad0208

Jiafeng Xiao, Linjie Liu, Xiaojie Chen, Attila Szolnoki

{"title":"Evolution of cooperation driven by sampling reward","authors":"Jiafeng Xiao, Linjie Liu, Xiaojie Chen, Attila Szolnoki","doi":"10.1088/2632-072x/ad0208","DOIUrl":"https://doi.org/10.1088/2632-072x/ad0208","url":null,"abstract":"Abstract A social dilemma implies that individuals will choose the defection strategy to maximize their individual gains. Reward is a powerful motivator to promote the evolution of cooperation, thus addressing the social dilemma. Nevertheless, it is costly since we need to monitor all participants in the game. Inspired by these observations, we here propose an inexpensive protocol, a so-called sampling reward mechanism, and apply it to social dilemmas, including public goods game and collective-risk social dilemma. More precisely, the actual usage of reward depends on the portion of cooperators in the sample. We show that the average cooperation level can be eﬀectively improved under high reward threshold and high reward intensity, albeit at the expense of reward cost. It is intriguing to discover that for the latter aspect, there is a critical threshold at which further increases in reward intensity have no signiﬁcant eﬀect on improving the cooperation level. Moreover, we ﬁnd that the small sample size favors the evolution of cooperation while an intermediate sample size always results in a lower reward cost. We also demonstrate that our ﬁndings are robust and remain valid for both types of social dilemma.&#xD;","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136294207","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

Efficient network exploration by means of resetting self-avoiding random walkers 通过重置自回避随机漫步者的有效网络探索

Journal of Physics Complexity Pub Date : 2023-10-09 DOI: 10.1088/2632-072x/acff33

Gaia Colombani, Giulia Bertagnolli, Oriol Artime

{"title":"Efficient network exploration by means of resetting self-avoiding random walkers","authors":"Gaia Colombani, Giulia Bertagnolli, Oriol Artime","doi":"10.1088/2632-072x/acff33","DOIUrl":"https://doi.org/10.1088/2632-072x/acff33","url":null,"abstract":"Abstract The self-avoiding random walk (SARW) is a stochastic process whose state variable avoids returning to previously visited states. This non-Markovian feature has turned SARWs a powerful tool for modeling a plethora of relevant aspects in network science, such as network navigability, robustness and resilience. We analytically characterize self-avoiding random walkers that evolve on complex networks and whose memory suffers stochastic resetting, that is, at each step, with a certain probability, they forget their previous trajectory and start free diffusion anew. Several out-of-equilibrium properties are addressed, such as the time-dependent position of the walker, the time-dependent degree distribution of the non-visited network and the first-passage time distribution, and its moments, to target nodes. We examine these metrics for different resetting parameters and network topologies, both synthetic and empirical, and find a good agreement with simulations in all cases. We also explore the role of resetting on network exploration and report a non-monotonic behavior of the cover time: frequent memory resets induce a global minimum in the cover time, significantly outperforming the well-known case of the pure random walk, while reset events that are too spaced apart become detrimental for the network discovery. Our results provide new insights into the profound interplay between topology and dynamics in complex networks, and shed light on the fundamental properties of SARWs in nontrivial environments.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135044059","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

Unraveling the dynamics of wealth inequality and the impact on social mobility and health disparities 揭示财富不平等的动态以及对社会流动性和健康差距的影响

Journal of Physics Complexity Pub Date : 2023-10-04 DOI: 10.1088/2632-072x/ad0018

Caterina A M La Porta, Stefano Zapperi

{"title":"Unraveling the dynamics of wealth inequality and the impact on social mobility and health disparities","authors":"Caterina A M La Porta, Stefano Zapperi","doi":"10.1088/2632-072x/ad0018","DOIUrl":"https://doi.org/10.1088/2632-072x/ad0018","url":null,"abstract":"Abstract Inequalities in wealth, income, access to food and healthcare have been rising worldwide in the past decades, approaching levels seen in the early 20th century. Here we study the relationships between wealth inequality and mobility for diﬀerent segments of the population, comparing longitudinal surveys conducted in the USA and in Italy. The larger wealth inequality observed in the USA is reﬂected by poorer health conditions than in Italy. We also ﬁnd that in both countries wealth mobility becomes slower at the two extremes of the wealth distribution. Households trapped in a state of persistent lack of wealth are generally experiencing greater food insecurity and poorer health than the general population. We interpret the observed association between inequality and immobility using a simple agent based model of wealth condensation driven by random returns and exchanges. The model describes well survey data on a qualitative level, but the mobility is generally overestimated by the model. We trace back this discrepancy to the way income is generated for low-wealth households which is not correctly accounted by the model. On the other hand, the model is excellent in describing the wealth dynamics within a restricted class of ultra-wealthy, as we demonstrate by analyzing billionaires lists. Our results suggest that diﬀerent forms of inequality are intertwined and should therefore be addressed together.&#xD;","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"19 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":"135549048","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

Focus on Monitoring and Control of Complex Supply Systems 关注复杂供应系统的监测和控制

Journal of Physics Complexity Pub Date : 2023-09-18 DOI: 10.1088/2632-072x/acfadd

Robin Delabays, Laurent Pagnier, Benjamin Schäfer, Melvyn Tyloo, Dirk Witthaut

引用次数: 0