Title: Hubbert's theory and photovoltaics: the nonsense race of breaking energy-conversion records Author:Belançon, Marcos Paulo Subject:Physics - Physics And Society Description:
The wide public sees solar energy as the future of mankind, and media channels quite oftenly states that our challenge is to improve efficiencies and reduce cost. However, one may point some unconvenient truth's about the physical limits we are facing, that are barely discussed by the public or even by scientists and institutions that are strongly biased towards a picture of a sustainable oil free energy in the future. In this work we discuss some of those physical limits of photovoltaics based on the principle of the Hubbert's theory for the oil peak, evidencing that much of the research is focused on photovoltaic efficiencies and this parameter is widely overestimated: better efficiencies oftenly are the result of complex technologies that are expensive and not scalable. In this context, if fossil fuels proved not replaceable, it is very likely that our socioeconomic ideas based in the past will not withstand an energy transition to high cost and low quality sources.
1710.01064 (ARXIV ID)
Title: About Network Structures and Systems Complexity Author:Polishchuk, Olexandr Subject:Physics - Physics And Society Description:
This paper provides the analysis for structural and functional approaches of complex network systems research. In order to study the behavior of these systems the flow adjacency matrices were introduced, and local and global dynamic characteristics of system elements were defined. The notion of the flow core of network system was introduced and its advantages over the k-core of complex network were analyzed. The methods were proposed for identifying real structure of network system and reducing the dimensionality of its model. Comment: 12 pages, 5 figures
1807.06044 (ARXIV ID)
A stochastic evolutionary model for survival dynamics
Title: Voting by Hands Promotes Institutionalised Monitoring in Indirect Reciprocity Author:Nakamura, Mitsuhiro; Dieckmann, Ulf Subject:Physics - Physics And Society Description:
Indirect reciprocity based on reputation is a leading mechanism driving human cooperation, where monitoring of behaviour and sharing reputation-related information are crucial. Because collecting information is costly, a tragedy of the commons can arise, with some individuals free-riding on information supplied by others. This can be overcome by organising monitors that aggregate information, supported by fees from their information users. We analyse a co-evolutionary model of individuals playing a social dilemma game and monitors watching them; monitors provide information and players vote for a more beneficial monitor. We find that (1) monitors that simply rate defection badly cannot stabilise cooperation---they have to overlook defection against ill-reputed players; (2) such overlooking monitors can stabilise cooperation if players vote for monitors rather than to change their own strategy; (3) STERN monitors, who rate cooperation with ill-reputed players badly, stabilise cooperation more easily than MILD monitors, who do not do so; (4) a STERN monitor wins if it competes with a MILD monitor; and (5) STERN monitors require a high level of surveillance and achieve only lower levels of cooperation, whereas MILD monitors achieve higher levels of cooperation with loose and thus lower cost monitoring. Comment: 22 pages, 4 figures (supplementary information: 12 pages, 3 figures). Under review in Royal Society Open Science
1610.01684 (ARXIV ID)
Title: Cyber Defense as a Complex Adaptive System: A model-based approach to strategic policy design Author:Norman, Michael D.; Koehler, Matthew T. K. Subject:Physics - Physics And Society Description:
In a world of ever-increasing systems interdependence, effective cybersecurity policy design seems to be one of the most critically understudied elements of our national security strategy. Enterprise cyber technologies are often implemented without much regard to the interactions that occur between humans and the new technology. Furthermore, the interactions that occur between individuals can often have an impact on the newly employed technology as well. Without a rigorous, evidence-based approach to ground an employment strategy and elucidate the emergent organizational needs that will come with the fielding of new cyber capabilities, one is left to speculate on the impact that novel technologies will have on the aggregate functioning of the enterprise. In this paper, we will explore a scenario in which a hypothetical government agency applies a complexity science perspective, supported by agent-based modeling, to more fully understand the impacts of strategic policy decisions. We present a model to explore the socio-technical dynamics of these systems, discuss lessons using this platform, and suggest further research and development.
1706.08598 (ARXIV ID)
Using network science to analyze football passing networks: dynamics, space, time and the multilayer nature of the game
Buldú, J. M., Busquets, J., Martínez, J. H., Herrera-Diestra, J. L., Echegoyen, I., Galeano, J., Luque, J.
Front. Psychol. 9:1900 (2018)
[Peer Reviewed Journal]
Title: Power-like Tail Observed in Weight Distributions of Schoolchildren Author:Kuninaka, Hiroto Subject:Physics - Physics And Society Description:
We investigated the statistical properties of the weight distributions of Japanese children who were born in 1996, from recent data. The weights of 16- and 17-year-old male children have a lognormal distribution with a power-like tail, which is best modeled by the double Pareto distribution. The emergence of the power-like tail may be attributed to the low probability that an obese person will attain a normal weight. Comment: 8 pages, 2 figures, submitted to J. Phys. Soc. Jpn
1509.04560 (ARXIV ID)
Crowd Flow Modeling of Athletes in Mass Sports Events -- a Macroscopic Approach
Traffic and Granular Flow '13 (Springer), pp. 21-29 (2015)