Carlos Gershenson

Binghamton, New York, United States Contact Info
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  • Santa Fe Institute

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Publications

  • Why Does Public Transport Not Arrive on Time? The Pervasiveness of Equal Headway Instability

    PLoS ONE 4(10): e7292

    Background
    The equal headway instability phenomenon is pervasive in public transport systems. This instability is characterized by an aggregation of vehicles that causes inefficient service. While equal headway instability is common, it has not been studied independently of a particular scenario. However, the phenomenon is apparent in many transport systems and can be modeled and rectified in abstraction.

    Methodology
    We present a multi-agent simulation where a default method with…

    Background
    The equal headway instability phenomenon is pervasive in public transport systems. This instability is characterized by an aggregation of vehicles that causes inefficient service. While equal headway instability is common, it has not been studied independently of a particular scenario. However, the phenomenon is apparent in many transport systems and can be modeled and rectified in abstraction.

    Methodology
    We present a multi-agent simulation where a default method with no restrictions always leads to unstable headways. We discuss two methods that attempt to achieve equal headways, called minimum and maximum. Since one parameter of the methods depends on the passenger density, adaptive versions—where the relevant parameter is adjusted automatically—are also put forward. Our results show that the adaptive maximum method improves significantly over the default method. The model and simulation give insights of the interplay between transport design and passenger behavior. Finally, we provide technological and social suggestions for engineers and passengers to help achieve equal headways and thus reduce delays.

    Conclusions
    The equal headway instability phenomenon can be avoided with the suggested technological and social measures.

    Other authors
    • Luis A. Pineda
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  • Design and Control of Self-organizing Systems

    CopIt Arxives

    Complex systems are usually difficult to design and control. There are several particular methods for coping with complexity, but there is no general approach to build complex systems. In this book I propose a methodology to aid engineers in the design and control of complex systems. This is based on the description of systems as self-organizing. Starting from the agent metaphor, the methodology proposes a conceptual framework and a series of steps to follow to find proper mechanisms that will…

    Complex systems are usually difficult to design and control. There are several particular methods for coping with complexity, but there is no general approach to build complex systems. In this book I propose a methodology to aid engineers in the design and control of complex systems. This is based on the description of systems as self-organizing. Starting from the agent metaphor, the methodology proposes a conceptual framework and a series of steps to follow to find proper mechanisms that will promote elements to find solutions by actively interacting among themselves.

    See publication

Languages

  • English

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  • Spanish

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  • Russian

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  • Dutch

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  • French

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  • Japanese

    Elementary proficiency

  • Italian

    Elementary proficiency

  • Portuguese

    Elementary proficiency

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