Results 1  10
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1,475
Performance Analysis of the IEEE 802.11 Distributed Coordination Function
, 2000
"... Recently, the IEEE has standardized the 802.11 protocol for Wireless Local Area Networks. The primary medium access control (MAC) technique of 802.11 is called distributed coordination function (DCF). DCF is a carrier sense multiple access with collision avoidance (CSMA/CA) scheme with binary slott ..."
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Cited by 1869 (1 self)
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Recently, the IEEE has standardized the 802.11 protocol for Wireless Local Area Networks. The primary medium access control (MAC) technique of 802.11 is called distributed coordination function (DCF). DCF is a carrier sense multiple access with collision avoidance (CSMA/CA) scheme with binary
The homogeneous coordinate ring of a toric variety
, 1992
"... This paper will introduce the homogeneous coordinate ring S of a toric variety X. The ring S is a polynomial ring with one variable for each onedimensional cone in the fan ∆ determining X, and S has a natural grading determined by the monoid of effective divisor classes in the Chow group An−1(X) of ..."
Abstract

Cited by 474 (7 self)
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sheaves on X. We also define a monomial ideal B ⊂ S that describes the combinatorial structure of the fan ∆. In the case of projective space, the ring S is just the usual homogeneous coordinate ring C[x0,..., xn], and the ideal B is the “irrelevant ” ideal 〈x0,..., xn〉. Projective space P n can
Directed Diffusion for Wireless Sensor Networking
 IEEE/ACM Transactions on Networking
, 2003
"... Advances in processor, memory and radio technology will enable small and cheap nodes capable of sensing, communication and computation. Networks of such nodes can coordinate to perform distributed sensing of environmental phenomena. In this paper, we explore the directed diffusion paradigm for such ..."
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Cited by 675 (9 self)
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Advances in processor, memory and radio technology will enable small and cheap nodes capable of sensing, communication and computation. Networks of such nodes can coordinate to perform distributed sensing of environmental phenomena. In this paper, we explore the directed diffusion paradigm
Dictionary of protein secondary structure: pattern recognition of hydrogenbonded and geometrical features
, 1983
"... For a successful analysis of the relation between amino acid sequence and protein structure, an unambiguous and physically meaningful definition of secondary structure is essential. We have developed a set of simple and physically motivated criteria for secondary structure, programmed as a patternr ..."
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Cited by 2096 (5 self)
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recognition process of hydrogenbonded and geometrical features extracted from xray coordinates. Cooperative secondary structure is recognized as repeats of the elementary hydrogenbonding patterns “turn ” and “bridge. ” Repeating turns are “helices, ” repeating bridges are “ladders, ” connected ladders are “sheets
The Dantzig selector: statistical estimation when p is much larger than n
, 2005
"... In many important statistical applications, the number of variables or parameters p is much larger than the number of observations n. Suppose then that we have observations y = Ax + z, where x ∈ R p is a parameter vector of interest, A is a data matrix with possibly far fewer rows than columns, n ≪ ..."
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Cited by 879 (14 self)
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‖ˆx − x ‖ 2 ℓ2 ≤ C2 ( · 2 log p · σ 2 + ∑ min(x 2 i, σ 2) Our results are nonasymptotic and we give values for the constant C. In short, our estimator achieves a loss within a logarithmic factor of the ideal mean squared error one would achieve with an oracle which would supply perfect information
Toric ideals of phylogenetic invariants
 JOURNAL OF COMPUTATIONAL BIOLOGY
, 2005
"... Statistical models of evolution are algebraic varieties in the space of joint probability distributions on the leaf colorations of a phylogenetic tree. The phylogenetic invariants of a model are the polynomials which vanish on the variety. Several widely used models for biological sequences have tra ..."
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Cited by 82 (16 self)
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transition matrices that can be diagonalized by means of the Fourier transform of an abelian group. Their phylogenetic invariants form a toric ideal in the Fourier coordinates. We determine minimal generators and Gröbner bases for these toric ideals. For the JukesCantor and Kimura models on a binary tree
Coordinate subspace arrangements and monomial ideals
, 1998
"... We relate the (co)homological properties of real coordinate subspace arrangements and of monomial ideals. ..."
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Cited by 6 (1 self)
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We relate the (co)homological properties of real coordinate subspace arrangements and of monomial ideals.
TAME IDEALS AND BLOWUPS
, 2008
"... We study blowups of affine nspace An K = Spec(K[x1,..., xn]) with center an arbitrary monomial ideal I. We give a combinatorial criterion to decide wether eA n K is smooth. It just uses the Newtonpolyhedron associated to the monomial ideal. We call monomial ideals which produce a smooth blowup e A ..."
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An K tame ideals. In case of a singular blowup we describe a smoothening procedure proposed by Rosenberg [20]. Further we study blowups in products of coordinate ideals. In particular we examine the question when such a product is tame. In this context we turn our attention to monomial building sets
The Event Heap: A Coordination Infrastructure for Interactive Workspaces
, 2002
"... Abstract. Coordinating the interactions of applications running on the diversity of devices that will be common in ubiquitous computing environments is still a difficult and not completely solved problem. We look at one such environment, an interactive workspace, where groups come together to collab ..."
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Cited by 108 (13 self)
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to collaborate on solving problems. Such a space will contain a heterogeneous collection of both new and legacy applications and devices. We propose that a tuplespace model with several extensions is ideal for coordination in this environment. We present a prototype implementation of such a model called
Geometric idealizers
"... Abstract. Let X be a projective variety, σ an automorphism of X, L a σample invertible sheaf on X, and Z a closed subscheme of X. Inside the twisted homogeneous coordinate ring B = B(X, L, σ), let I be the right ideal of sections vanishing at Z. We study the subring R = k + I of B. Under mild condi ..."
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Cited by 3 (2 self)
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Abstract. Let X be a projective variety, σ an automorphism of X, L a σample invertible sheaf on X, and Z a closed subscheme of X. Inside the twisted homogeneous coordinate ring B = B(X, L, σ), let I be the right ideal of sections vanishing at Z. We study the subring R = k + I of B. Under mild
Results 1  10
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1,475