scholarly journals Resilience or robustness: identifying topological vulnerabilities in rail networks

2019 ◽  
Vol 6 (2) ◽  
pp. 181301 ◽  
Author(s):  
Alessio Pagani ◽  
Guillem Mosquera ◽  
Aseel Alturki ◽  
Samuel Johnson ◽  
Stephen Jarvis ◽  
...  
Keyword(s):  
Large Scale ◽  
Critical Infrastructure ◽  
Poor Performance ◽  
Feedback Loops ◽  
Consumer Experience ◽  
Transport Networks ◽  
Agent Based ◽  
National Importance ◽  
Topological Measures ◽  
Cascade Effects

Many critical infrastructure systems have network structures and are under stress. Despite their national importance, the complexity of large-scale transport networks means that we do not fully understand their vulnerabilities to cascade failures. The research conducted through this paper examines the interdependent rail networks in Greater London and surrounding commuter area. We focus on the morning commuter hours, where the system is under the most demand stress. There is increasing evidence that the topological shape of the network plays an important role in dynamic cascades. Here, we examine whether the different topological measures of resilience (stability) or robustness (failure) are more appropriate for understanding poor railway performance. The results show that resilience, not robustness, has a strong correlation with the consumer experience statistics. Our results are a way of describing the complexity of cascade dynamics on networks without the involvement of detailed agent-based models, showing that cascade effects are more responsible for poor performance than failures. The network science analysis hints at pathways towards making the network structure more resilient by reducing feedback loops.

The Necessity and Ways of Legitimation of Large-scale Private Property in Russia: Raising a Problem

2007 ◽  
pp. 4-26
Author(s):  
G. Yavlinsky
Keyword(s):  
Large Scale ◽  
Private Property ◽  
Negative Consequences ◽  
Specific Nature ◽  
Considerable Part ◽  
Russian People ◽  
National Importance ◽  
Historical Tradition ◽  
Special Rules ◽  
Economic Assets

Results of privatization campaign in 1990’s continue to meet strong opposition from a very considerable part of Russian people and authorities actually refuse to consider the rights of private owners legitimate and not subject to violation. One of the reasons for this, besides historical tradition, is a specific nature of Russian privatization of 1990’s. The article brings to discussion a set of measures aimed at overcoming its negative consequences. While insisting on the need to honor all previous government obligations and commitments, the paper proposes a one-time special tax (windfall tax) to be levied on those who benefited most from privatization deals that were not just and fair, and special rules to be set for the use and sale of economic assets of national importance. The author also considers possible ways to legitimize private property, as well as chances to achieve а broad public consensus on this issue in Russia.

Pèlerinages barrésiens

2013 ◽  
pp. 116-123
Author(s):  
Claire Bompaire-Evesque
Keyword(s):  
Large Scale ◽  
The Self ◽  
Joan Of Arc ◽  
The Third ◽  
National Importance ◽  
The Earth ◽  
Third Stage ◽  
The Dead

This article is a inquiry about how Barrès (1862-1923) handles the religious rite of pilgrimage. Barrès stages in his writings three successive forms of pilgrimage, revealing what is sacred to him at different times. The pilgrimage to a museum or to the birthplace of an artist is typical for the egotism and the humanism of the young Barrès, expressed in the Cult of the Self (1888-1891). After his conversion to nationalism, Barrès tries to unite the sons of France and to instill in them a solemn reverence for “the earth and the dead” ; for that purpose he encourages in French Amities (1903) pilgrimages to historical places of national importance (battlefields; birthplace of Joan of Arc), building what Nora later called the Realms of Memory. The third stage of Barrès’ intellectual evolution is exemplified by The Sacred Hill (1913). In this book the writer celebrates the places where “the Spirit blows”, and proves open to a large scale of spiritual forces, reaching back to paganism and forward to integrative syncretism, which aims at unifying “the entire realm of the sacred”.

scholarly journals Navigability assessment of large-scale redesigns in nine public transport networks: Open timetable data approach

2021 ◽  
Vol 147 ◽  
pp. 212-229
Author(s):  
Christoffer Weckström ◽  
Miloš N. Mladenović ◽  
Rainer Kujala ◽  
Jari Saramäki
Keyword(s):  
Public Transport ◽  
Large Scale ◽  
Transport Networks

scholarly journals Equity Effects of Congestion Charges: An Exploratory Analysis with MATSim

2017 ◽  
Vol 2670 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Lucas Meyer de Freitas ◽  
Oliver Schuemperlin ◽  
Milos Balac ◽  
Francesco Ciari
Keyword(s):  
Travel Time ◽  
Large Scale ◽  
Agent Based ◽  
Promising Tool ◽  
Travel Time Savings ◽  
Time Savings ◽  
Time Changes ◽  
High Level ◽  
Congestion Charging ◽  
Equity Effects

This paper shows an application of the multiagent, activity-based transport simulation MATSim to evaluate equity effects of a congestion charging scheme. A cordon pricing scheme was set up for a scenario of the city of Zurich, Switzerland, to conduct such an analysis. Equity is one of the most important barriers toward the implementation of a congestion charging system. After the challenges posed by equity evaluations are examined, it is shown that agent-based simulations with heterogeneous values of time allow for an increased level of detail in such evaluations. Such detail is achieved through a high level of disaggregation and with a 24-h simulation period. An important difference from traditional large-scale models is the low degree of correlation between travel time savings and welfare change. While traditional equity analysis is based on travel time savings, MATSim shows that choice dimensions not included in traditional models, such as departure time changes, can also play an important role in equity effects. The analysis of the results in light of evidence from the literature shows that agent-based models are a promising tool to conduct more complete equity evaluations not only of congestion charges but also of transport policies in general.

Synthetic Environments for Investigating Collaborative Information Seeking: An Application in Emergency Restoration of Critical Infrastructures

2015 ◽  
Vol 12 (3) ◽  
Author(s):  
David Mendonça ◽  
William A. Wallace ◽  
Barbara Cutler ◽  
James Brooks
Keyword(s):  
Information Seeking ◽  
Large Scale ◽  
Critical Infrastructure ◽  
Future Research ◽  
Critical Infrastructures ◽  
Close Collaboration ◽  
Number Of Factors ◽  
Computer Based ◽  
Collaborative Information Seeking ◽  
Post Disaster

AbstractLarge-scale disasters can produce profound disruptions in the fabric of interdependent critical infrastructure systems such as water, telecommunications and electric power. The work of post-disaster infrastructure restoration typically requires information sharing and close collaboration across these sectors; yet – due to a number of factors – the means to investigate decision making phenomena associated with these activities are limited. This paper motivates and describes the design and implementation of a computer-based synthetic environment for investigating collaborative information seeking in the performance of a (simulated) infrastructure restoration task. The main contributions of this work are twofold. First, it develops a set of theoretically grounded measures of collaborative information seeking processes and embeds them within a computer-based system. Second, it suggests how these data may be organized and modeled to yield insights into information seeking processes in the performance of a complex, collaborative task. The paper concludes with a discussion of implications of this work for practice and for future research.

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