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Design of capacityapproaching irregular lowdensity paritycheck codes
 IEEE TRANS. INFORM. THEORY
, 2001
"... We design lowdensity paritycheck (LDPC) codes that perform at rates extremely close to the Shannon capacity. The codes are built from highly irregular bipartite graphs with carefully chosen degree patterns on both sides. Our theoretical analysis of the codes is based on [1]. Assuming that the unde ..."
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Cited by 589 (6 self)
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that the underlying communication channel is symmetric, we prove that the probability densities at the message nodes of the graph possess a certain symmetry. Using this symmetry property we then show that, under the assumption of no cycles, the message densities always converge as the number of iterations tends
Aging: a theory based on free radical and radiation chemistry
 J Gerontol
, 1956
"... The phenomenon of growth, decline and deathaginghas been the source of considerable speculation (1, 8, 10). This cycle seems to be a more or less direct function of the metabolic rate and this in turn depends on the species (animal or plant) on which are superimposed the factors of heredity and ..."
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Cited by 635 (2 self)
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The phenomenon of growth, decline and deathaginghas been the source of considerable speculation (1, 8, 10). This cycle seems to be a more or less direct function of the metabolic rate and this in turn depends on the species (animal or plant) on which are superimposed the factors of heredity
Labor supply flexibility and portfolio choice in a life cycle model
, 1992
"... This paper examines the effect of the laborleisure choice on portfolio and consumption decisions over an individual’s life cycle. The model incorporates the fact that individuals may have considerable flexibility in varying their work effort (including their choice of when to retire). Given this fl ..."
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Cited by 351 (8 self)
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this flexibility, the individual simultaneously determines optimal levels of current consumption, labor effort, and an optimal financial investment strategy at each point in his life cycle. We show that labor and investment choices are intimately related. The ability to vary labor supply ex post induces
The strong perfect graph theorem
 ANNALS OF MATHEMATICS
, 2006
"... A graph G is perfect if for every induced subgraph H, the chromatic number of H equals the size of the largest complete subgraph of H, and G is Berge if no induced subgraph of G is an odd cycle of length at least five or the complement of one. The “strong perfect graph conjecture” (Berge, 1961) asse ..."
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Cited by 284 (22 self)
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A graph G is perfect if for every induced subgraph H, the chromatic number of H equals the size of the largest complete subgraph of H, and G is Berge if no induced subgraph of G is an odd cycle of length at least five or the complement of one. The “strong perfect graph conjecture” (Berge, 1961
Superstrings and topological strings at large
 N”, J. Math. Phys
"... We embed the large N ChernSimons/topological string duality in ordinary superstrings. This corresponds to a large N duality between generalized gauge systems with N = 1 supersymmetry in 4 dimensions and superstrings propagating on noncompact CalabiYau manifolds with certain fluxes turned on. We a ..."
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Cited by 254 (27 self)
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dual radius. We also consider Dbrane/antiDbrane system wrapped over vanishing cycles of compact CalabiYau manifolds and argue that at large N they induce a shift in the background to a topologically distinct CalabiYau, which we identify as the ground state system of the Brane/antiBrane system. August
Packing Cycles in Graphs, II
"... A graph G packs if for every induced subgraph H of G, the maximum number of vertexdisjoint cycles in H is equal to the minimum number of vertices whose deletion from H results in a forest. The purpose of this paper is to characterize all graphs that pack. ..."
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A graph G packs if for every induced subgraph H of G, the maximum number of vertexdisjoint cycles in H is equal to the minimum number of vertices whose deletion from H results in a forest. The purpose of this paper is to characterize all graphs that pack.
On Packing Shortest Cycles in Graphs
"... Abstract. We study the problems to find a maximum packing of shortest edgedisjoint cycles in a graph of given girth g (gESCP) and its vertexdisjoint analogue gVSCP. In the case g = 3, Caprara and Rizzi (2001) have shown that gESCP can be solved in polynomial time for graphs with maximum degree ..."
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Abstract. We study the problems to find a maximum packing of shortest edgedisjoint cycles in a graph of given girth g (gESCP) and its vertexdisjoint analogue gVSCP. In the case g = 3, Caprara and Rizzi (2001) have shown that gESCP can be solved in polynomial time for graphs with maximum degree
Financial intermediation and credit policy in business cycle analysis
 PREPARED FOR THE HANDBOOK OF MONETARY ECONOMICS
, 2010
"... We develop a canonical framework to think about credit market frictions and aggregate economic activity in the context of the current crisis. We use the framework to address two issues in particular: first, how disruptions in financial intermediation can induce a crisis that affects real activity; a ..."
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Cited by 195 (7 self)
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We develop a canonical framework to think about credit market frictions and aggregate economic activity in the context of the current crisis. We use the framework to address two issues in particular: first, how disruptions in financial intermediation can induce a crisis that affects real activity
International Trade and Macroeconomic Dynamics with Heterogeneous Firms
 Quarterly Journal of Economics
, 2005
"... We develop a stochastic, general equilibrium, twocountry model of trade and macroeconomic dynamics. Productivity differs across individual, monopolistically competitive firms in each country. Firms face a sunk entry cost in the domestic market and both fixed and perunit export costs. Only relativ ..."
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Cited by 227 (8 self)
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relatively more productive firms export. Exogenous shocks to aggregate productivity and entry or trade costs induce firms to enter and exit both their domestic and export markets, thus altering the composition of consumption baskets across countries over time. In a world of flexible prices, our model
Results 1  10
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1,000,090