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We present a supersymmetric action functional for the coupled system of an open fundamental superstring and super–D0–branes attached to (identified with) the string endpoints. As a preliminary step the geometrical actions for a free superD0-brane and a free type IIA superstring have been built. The pure bosonic limits of the action for the coupled system and of the equations of motion are discu...

We present an algorithm for learning a model of the effects of actions in noisy stochastic worlds. We consider learning in a 3D simulated blocks world with realistic physics. To model this world, we develop a planning representation with explicit mechanisms for expressing object reference and noise. We then present a learning algorithm that can create rules while also learning derived predicate...

In this paper we study T 2 compactification of six-dimensional massive type IIA supergravity in presence of Ramond-Ramond background fluxes. The resulting theory in four dimensions is shown to possess SL(2, R)×SL(2, R)×O(4, 20) duality symmetry. It is shown that specific elements of this symmetry relate massive type IIA compactified on K3 × T 2 (fluxes along K3) to the ordinary type IIA compact...

Animals lacking Src homology 2 domain-containing inositol 5-phosphatase (SHIP) display a reduction in lymphopoiesis and a corresponding enhancement of myelopoiesis. These effects are mediated at least in part by elevated levels of interleukin 6 (IL-6). Here, we show the lymphopoiesis block in SHIP-/- mice is due to suppression of the lymphoid lineage choice by uncommitted progenitors. The suppr...

Small variations in how a task is designed can lead humans to tradeoff interaction-intensive for memory-intensive strategies. In this paper we introduce one such task, Blocks World, and present empirical data that shows such tradeoffs. Our attempts to model the acquisition of these tradeoffs using the default ACT-R conflict resolution mechanisms have met with failure. We have now run our model ...

Ag eneral architecture for the computer implementation of a theory of emotions is presented. The model is based mainly on a cognitive orientated theory proposed by Frijda 1986 where emotions are described as the manifestations of a concern satisfaction system. The model applies the theory to multiple agents in a blocks world environment where actions may or may not be emotional. Related work is...