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Automatic control: the vertebral column of dogfish sharks behaves as a continuously variable transmission with smoothly shifting functions

Publication Date
2016-July-07
Document Type
Abstract

During swimming in dogfish sharks, Squalus acanthias, both the intervertebral joints and the vertebral centra undergo significant strain. To investigate this system, unique among vertebrates, we cyclically bent isolated segments of 10 vertebrae and nine joints….

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Built for speed: strain in the cartilaginous vertebral columns of sharks

Publication Date
2014-February-01
Document Type
Abstract

In most bony fishes vertebral column strain during locomotion is almost exclusively in the intervertebral joints, and when these joints move there is the potential to store and release strain energy. Since cartilaginous fishes have poorly mineralized vertebral centra, we...

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Energy Consumption and Habit Formation: Evidence from High Frequency Thermostat Data

Publication Date
2017-January-01
Document Type
Department or Program
Abstract

Using minute-by-minute data from over 60,000 smart thermostats in households distributed across the United States, we analyze the persistence of energy consumption behaviors in response to external weather shocks. The analysis examines habitual behavior and provides insight into what affects...

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Everyone knows that someone knows: quantifiers over epistemic agents

Publication Date
2018-January-01
Document Type
Department or Program
Abstract

Modal logic S5 is commonly viewed as an epistemic logic that captures the most basic properties of knowledge. Kripke proved a completeness theorem for the first-order modal logic S5 with respect to a possible worlds semantics. A multiagent version of...

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Information Flow under Budget Constraints

Publication Date
2018-February-26
Document Type
Department or Program
Abstract

Although first proposed in the database theory as properties of functional dependencies between attributes, Armstrong's axioms capture general principles of information flow by describing properties of dependencies between sets of pieces of information. This article generalizes Armstrong's axioms to a...

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Lighthouse principle for diffusion in social networks

Publication Date
2018-January-01
Document Type
Department or Program
Abstract

The article investigates an influence relation between two sets of agents in a social network. It proposes a logical system that captures propositional properties of this relation valid in all threshold models of social networks with the same structure. The...

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