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2003 The Age of Migration
 International Population Movements in the Modern World, 3rd Edition
"... evelopment ..."
ON ΦMORI RINGS
, 2006
"... A commutative ring R is said to be a φring if its nilradical Nil(R) is both prime and comparable with each principal ideal. The name is derived from the natural map φ from the total quotient ring T (R) to R localized at Nil(R). An ideal I that properly contains Nil(R) is φdivisorial if (φ(R) : ( ..."
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Cited by 3 (2 self)
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(R) : (φ(R) : φ(I)) = φ(I). A ring is a φMori ring if it is a φring that satisfies the ascending chain condition on φdivisorial ideals. Many of the properties and characterizations of Mori domains can be extended to φMori rings, but some cannot.
Adaptive Statistical Language Modeling: A Maximum Entropy Approach
, 1994
"... Language modeling is the attempt to characterize, capture and exploit regularities in natural language. In statistical language modeling, large amounts of text are used to automatically determine the model's parameters. Language modeling is useful in automatic speech recognition, machine transl ..."
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Cited by 206 (6 self)
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Language modeling is the attempt to characterize, capture and exploit regularities in natural language. In statistical language modeling, large amounts of text are used to automatically determine the model's parameters. Language modeling is useful in automatic speech recognition, machine translation, and any other application that processes natural language with incomplete knowledge. In this thesis, I view language as an information source which emits a stream of symbols from a finite alphabet (the vocabulary). The goal of language modeling is then to identify and exploit sources of information in the language stream, so as to minimize its perceived entropy. Most existing statistical language models exploit the immediate past only. To extract information from further back in the document's history, I use trigger pairs as the basic information bearing elements. This allows the model to adapt its expectations to the topic of discourse. Next, statistical evidence from many sources must...
The Design and Analysis of the MORIS Simulator
"... This paper presents the design and realtime analysis of two major subcomponents in the architecture of the MORIS motorcycle simulator. The simulator reproduces the inertial, visual and acoustic feedback perceived by a motorcycle rider. Like all control and virtual reality applications, the MORIS si ..."
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This paper presents the design and realtime analysis of two major subcomponents in the architecture of the MORIS motorcycle simulator. The simulator reproduces the inertial, visual and acoustic feedback perceived by a motorcycle rider. Like all control and virtual reality applications, the MORIS
A Survey of Computational Complexity Results in Systems and Control
, 2000
"... The purpose of this paper is twofold: (a) to provide a tutorial introduction to some key concepts from the theory of computational complexity, highlighting their relevance to systems and control theory, and (b) to survey the relatively recent research activity lying at the interface between these fi ..."
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Cited by 187 (21 self)
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The purpose of this paper is twofold: (a) to provide a tutorial introduction to some key concepts from the theory of computational complexity, highlighting their relevance to systems and control theory, and (b) to survey the relatively recent research activity lying at the interface between these fields. We begin with a brief introduction to models of computation, the concepts of undecidability, polynomial time algorithms, NPcompleteness, and the implications of intractability results. We then survey a number of problems that arise in systems and control theory, some of them classical, some of them related to current research. We discuss them from the point of view of computational complexity and also point out many open problems. In particular, we consider problems related to stability or stabilizability of linear systems with parametric uncertainty, robust control, timevarying linear systems, nonlinear and hybrid systems, and stochastic optimal control.
Deformation of curves and fibers of FanoMori contractions
"... Let ' : X !W be a FanoMori contraction of a smooth ndimensional variety. We prove that, if F = ' 1 (w) is a ber of ' and : U ! Z is a proper surjective morphism from an open dense subset of F to a quasiprojective variety of positive dimension, then there exist rational curves ..."
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Let ' : X !W be a FanoMori contraction of a smooth ndimensional variety. We prove that, if F = ' 1 (w) is a ber of ' and : U ! Z is a proper surjective morphism from an open dense subset of F to a quasiprojective variety of positive dimension, then there exist rational
Disk instantons, mirror symmetry and the duality web
, 2001
"... We apply the methods recently developed for computation of type IIA disk instantons using mirror symmetry to a large class of Dbranes wrapped over Lagrangian cycles of noncompact CalabiYau 3folds. Along the way we clarify the notion of “flat coordinates” for the boundary theory. We also discover ..."
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Cited by 137 (25 self)
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We apply the methods recently developed for computation of type IIA disk instantons using mirror symmetry to a large class of Dbranes wrapped over Lagrangian cycles of noncompact CalabiYau 3folds. Along the way we clarify the notion of “flat coordinates” for the boundary theory. We also discover an integer IR ambiguity needed to define the quantum theory of Dbranes wrapped over noncompact Lagrangian submanifolds. In the large N dual ChernSimons theory, this ambiguity is mapped to the UV choice of the framing of the knot. In a type IIB dual description involving (p, q) 5branes, disk instantons of type IIA get mapped to (p, q) string instantons. The Mtheory lift of these results lead to computation of superpotential terms generated by M2 brane instantons wrapped over 3cycles of certain manifolds of G2 holonomy.
Matrix Model as a Mirror of ChernSimons Theory
, 2002
"... Using mirror symmetry, we show that ChernSimons theory on certain manifolds such as lens spaces reduces to a novel class of Hermitian matrix models, where the measure is that of unitary matrix models. We show that this agrees with the more conventional canonical quantization of ChernSimons theory. ..."
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Cited by 134 (17 self)
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Using mirror symmetry, we show that ChernSimons theory on certain manifolds such as lens spaces reduces to a novel class of Hermitian matrix models, where the measure is that of unitary matrix models. We show that this agrees with the more conventional canonical quantization of ChernSimons theory. Moreover, large N dualities in this context lead to computation of all genus Amodel topological amplitudes on toric CalabiYau manifolds in terms of matrix integrals. In the context of type IIA superstring compactifications on these CalabiYau manifolds with wrapped D6 branes (which are dual to Mtheory on G2 manifolds) this leads to engineering and solving Fterms for N = 1 supersymmetric gauge theories with superpotentials involving certain multitrace operators
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