Shubha Chakravarty

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Long House Valley in the Black Mesa area of northeastern Arizona (U.S.) was inhabited by the Kayenta Anasazi from about 1800 before Christ to about anno Domini 1300. These people were prehistoric ancestors of the modern Pueblo cultures of the Colorado Plateau. Paleoenvironmental research based on alluvial geomorphology, palynology, and dendroclimatology(More)
In response to concerns about possible bioterrorism, the authors developed an individual-based (or "agent-based") computational model of smallpox epidemic transmission and control. The model explicitly represents an "artificial society" of individual human beings, each implemented as a distinct object, or data structure in a computer program. These agents(More)
We use a constraint-based language to specify periodic temporal patterns. Our language is intended to be simple to use, while allowing a wide variety of patterns to be expressed. The language solves problems such as (1) how to use calendarbased constraints to define repetition of a periodic event, (2) what temporal relations must exist between consecutive(More)
We use a constraint-based language to specify repeating temporal patterns. The Constraint-based Pattern Specification Language (CAPSUL) is simple to use, but allows a wide variety of patterns to be expressed. This paper describes in detail the syntax of CAPSUL, including its layers of abstraction and four types of constraints. We also discuss the semantics(More)
We simulate an agent-based model in an attempt to replicate the statistical properties of daily changes in emerging market bond spreads over US treasuries, namely: 1) excess kurtosis; 2) serial correlation, suggesting deviation from market efficiency; and 3) excessive comovement, suggesting contagion. A simple model of interacting traders produces(More)
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