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3,853
Virtual time and global states of distributed systems.
 Proc. Workshop on Parallel and Distributed Algorithms,
, 1989
"... Abstract A distributed system can be characterized by the fact that the global state is distributed and that a common time base does not exist. However, the notion of time is an important concept in every day life of our decentralized \ r eal world" and helps to solve problems like getting a c ..."
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Cited by 744 (5 self)
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artially ordered a n d form a lattice. By using timestamps and a simple clock update mechanism the structure o f c ausality is represented in an isomorphic way. The new model of time has a close analogy to Minkowski's relativistic spacetime and leads among others to an interesting characterization
KodairaSpencer theory of gravity and exact results for quantum string amplitudes
 Commun. Math. Phys
, 1994
"... We develop techniques to compute higher loop string amplitudes for twisted N = 2 theories with ĉ = 3 (i.e. the critical case). An important ingredient is the discovery of an anomaly at every genus in decoupling of BRST trivial states, captured to all orders by a master anomaly equation. In a particu ..."
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Cited by 540 (59 self)
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particular realization of the N = 2 theories, the resulting string field theory is equivalent to a topological theory in six dimensions, the Kodaira– Spencer theory, which may be viewed as the closed string analog of the Chern–Simon theory. Using the mirror map this leads to computation of the ‘number
Lambertian Reflectance and Linear Subspaces
, 2000
"... We prove that the set of all reflectance functions (the mapping from surface normals to intensities) produced by Lambertian objects under distant, isotropic lighting lies close to a 9D linear subspace. This implies that, in general, the set of images of a convex Lambertian object obtained under a wi ..."
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Cited by 526 (20 self)
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We prove that the set of all reflectance functions (the mapping from surface normals to intensities) produced by Lambertian objects under distant, isotropic lighting lies close to a 9D linear subspace. This implies that, in general, the set of images of a convex Lambertian object obtained under a
Anomalies in intertemporal choice: Evidence and an interpretation
 QUARTERLY JOURNAL OF ECONOMICS
, 1992
"... Research on decision making under uncertainty has been strongly influenced by the documentation of numerous expected utility (EU) anomaliesbehaviors that violate the expected utility axioms. The relative lack of progress on the closely related topic of intertemporal choice is partly due to the abse ..."
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Cited by 364 (2 self)
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Research on decision making under uncertainty has been strongly influenced by the documentation of numerous expected utility (EU) anomaliesbehaviors that violate the expected utility axioms. The relative lack of progress on the closely related topic of intertemporal choice is partly due
THE NATURE OF THE VIRUS RECEPTORS OF RED CELLS I. EVIDENCE ON THE CHEMICAL NATURE OF THE VIRUS RECEPTORS OF RED CELLS AND O] ~ THE EXISTENCE OF A CLOSELY ANALOGOUS SUBSTANCE IN
, 1947
"... The ability of redcells from various species to adsorband elute the viruses of influenza, mumps, and Newcastle disease is of general interest in the problem of the mechanism of infection by viruses since the red cellvirus system may well involve principles which apply to the virushost cell relatio ..."
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Cited by 2 (0 self)
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The ability of redcells from various species to adsorband elute the viruses of influenza, mumps, and Newcastle disease is of general interest in the problem of the mechanism of infection by viruses since the red cellvirus system may well involve principles which apply to the virushost cell relationship. The elution of virus from cells, accompanied by the disappearance of the viresadsorbing capacity of the cells, indicates that an active destructive process has occurred. It has been suggested (1) that the destruction of receptors is due to an enzyme pgssessed by the virus, which is active against a substrate possessed by the cell, and no subsequent developments have suggested a more likely alternative. The ultimate goal in proof of this theory is clearly to isolate the cellular substrate and show what type of chemical action the virus may have upon it. There are several main ways in which the problem may be attacked: (1) attempts to isolate the receptor from the red cell; (2) treatment of the intact cell with reagents which may inactivate the receptor and give some clew to its chemical nature; and (3) searching for analogues of the receptor substance from other biological sources. In the present work only the second and third methods are used. Methods The virus strains used in this work were the PR8 strain of influenza A. the Lee strain of influenza B, and strain L230, which is an influenza A strain isolated in the epidemic of early 1947. The virus suspensions used were all prepared from allantoic fluid and were usually dialyzed against phosphate buffer before use. All of the hemaggiutinin and agglutinin inhibition titrations were carried out by the densitometric method of Ifirst and Pickels (2) and titers are expressed as the reciprocal of the final dilution of either virus or serum. All titration values have been corrected and given in terms of initial serum or virus concentrations so that they may be directly compared. EXPEI ~ ntc~.NTAL
Towards a modern theory of adaptive networks: expectation and prediction
 Psychol. Rev
, 1981
"... Many adaptive neural network theories are based on neuronlike adaptive elements that can behave as single unit analogs of associative conditioning. In this article we develop a similar adaptive element, but one which is more closely in accord with the facts of animal learning theory than elements co ..."
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Cited by 282 (18 self)
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Many adaptive neural network theories are based on neuronlike adaptive elements that can behave as single unit analogs of associative conditioning. In this article we develop a similar adaptive element, but one which is more closely in accord with the facts of animal learning theory than elements
Computation of channel capacity and ratedistortion functions
 IEEE Trans. Inform. Theory
, 1972
"... A&r&By defining mutual information as a maximum over an appropriate space, channel capacities can be defined as double maxima and ratedistortion functions as double minima. This approach yields valuable new insights regarding the computation of channel capacities and ratedistortion functi ..."
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Cited by 280 (1 self)
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that achieves the capacity of the given channel. Analogous algorithms then are provided for computing ramdistortion functions and constrained channel capacities. The algorithms apply both to discrete and to continuous alphabet channels or sources. In addition, a formalization of the theory of channel capacity
The Curvature Primal Sketch
 Acquisition of Visual Motion Guided Behaviors,” IJCAI'95
, 1984
"... In this paper we introduce a novel representation of the significant changes in curvature along the bounding contour of planar shape. Ve call the representation the curvature primgl ,sketch. We describe an implemented algorithn that computes the curvature primal sketch and illustra. te its performan ..."
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Cited by 236 (5 self)
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performance on a set of tool shapes. The curvature primal sketch derites ils name from the close analogy to the primal sketch representation advocated ty Mart for descri.bi!)g significant intensity changes. We define a set of primitive parameterized curvature discontinuities, and derive expressions
Orbihedra Of Nonpositive Curvature
 Progress in Mathematics
, 1995
"... . A 2dimensional orbihedron of nonpositive curvature is a pair (X; \Gamma), where X is a 2dimensional simplicial complex with a piecewise smooth metric such that X has nonpositive curvature in the sense of Alexandrov and Busemann and \Gamma is a group of isometries of X which acts properly disc ..."
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Cited by 252 (10 self)
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discontinuously and cocompactly. By analogy with Riemannian manifolds of nonpositive curvature we introduce a natural notion of rank 1 for (X; \Gamma) which turns out to depend only on \Gamma and prove that, if X is boundaryless, then either (X; \Gamma) has rank 1, or X is the product of two trees, or X is a
ANALOG
"... The most commonly used DAC structures (other than a simple 1bit DAC based on a single switch used with a reference voltage) are binary weighted DACs or ladder networks, but these, though relatively simple in structure, require quite complex analysis. We will start by examining one of the simplest s ..."
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structures of all, the Kelvin divider shown in Figure 4.1. An Nbit version of this DAC simply consists of 2 N equal resistors in series. The output is taken from the appropriate tap by closing one of the 2 N switches by decoding 1 of 2 N switches from the Nbit data. Recent DACs using this architecture
Results 1  10
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3,853