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Effective Erasure Codes for Reliable Computer Communication Protocols

by Luigi Rizzo , 1997
"... Reliable communication protocols require that all the intended recipients of a message receive the message intact. Automatic Repeat reQuest (ARQ) techniques are used in unicast protocols, but they do not scale well to multicast protocols with large groups of receivers, since segment losses tend to b ..."
Abstract - Cited by 470 (14 self) - Add to MetaCart
Reliable communication protocols require that all the intended recipients of a message receive the message intact. Automatic Repeat reQuest (ARQ) techniques are used in unicast protocols, but they do not scale well to multicast protocols with large groups of receivers, since segment losses tend

Two dimensional gauge theories revisited

by Edward Witten, Olden Lane - J. Geom. Phys , 1992
"... Two dimensional quantum Yang-Mills theory is reexamined using a non-abelian version of the Duistermaat-Heckman integration formula to carry out the functional integral. This makes it possible to explain properties of the theory that are inaccessible to standard methods and to obtain general expressi ..."
Abstract - Cited by 200 (3 self) - Add to MetaCart
expressions for intersection pairings on moduli spaces of flat connections on a two dimensional surface. The latter expressions agree, for gauge group SU(2), with formulas obtained recently by several methods. This paper will be devoted to a renewed study of two dimensional Yang-Mills theory without matter, a

The effects of choice and enhanced personal responsibility for the aged: A field experiment in an institutional setting

by Ellen J. Langer, Judith Rodin - Journal of Personality and Social Psychology , 1976
"... A field experiment was conducted to assess the effects of enhanced personal responsibility and choice on a group of nursing home residents. It was expected that the debilitated condition of many of the aged residing in institutional settings is, at least in part, a result of living in a virtually de ..."
Abstract - Cited by 169 (1 self) - Add to MetaCart
, to bolster the communication, the former group was given the freedom to make choices and the responsibility of caring for a plant rather than having decisions made and tbe plant taken care of for them by the staff, as was the case for the latter group. Questionnaire ratings and behavioral measures showed a

Profinite Groups

by Luis Ribes, Katherine Stevenson, Pavel Zalesskii , 2000
"... Abstract. Recently, it has been shown by Harbater and Stevenson that a profinite group G is free profinite of infinite rank m if and only if G is projective and m-quasifree. The latter condition requires the existence of m distinct solutions to certain embedding problems for G. In this paper we prov ..."
Abstract - Cited by 101 (5 self) - Add to MetaCart
Abstract. Recently, it has been shown by Harbater and Stevenson that a profinite group G is free profinite of infinite rank m if and only if G is projective and m-quasifree. The latter condition requires the existence of m distinct solutions to certain embedding problems for G. In this paper we

Self-determination and persistence in a real-life setting: Toward a motivational model of high school dropout.

by Robert J Vallerand , Michelle S Fbrtier , Frederic Guay - Journal of Personality and Social Psychology, , 1997
"... The purpose of this study was to propose and test a motivational model of high school dropout. The model posits that teachers, parents, and the school administration's behaviors toward students influence students' perceptions of competence and autonomy. The less autonomy supportive the so ..."
Abstract - Cited by 183 (19 self) - Add to MetaCart
, and 12 of unspecified gender) in the "persistent" group. Thus, 57% of all dropouts were boys, whereas only 43% were girls. This difference is significant, Results Motivation Toward School and Behavioral Intentions A 2 (type of student: dropout vs. persistent) X 2 (gender) x 7 (type of school

Rational surfaces associated with affine root systems and geometry of the Painlevé equations

by Hidetaka Sakai , 1999
"... We present a geometric approach to the theory of Painlev'e equations based on rational surfaces. Our starting point is a compact smooth rational surface X which has a unique anti-canonical divisor D of canonical type. We classify all such surfaces X. To each X, there corresponds a root subsyste ..."
Abstract - Cited by 160 (6 self) - Add to MetaCart
constitutes their group of symmetries by Backlund transformations. The six Painlev'e differential equations appear as degenerate cases of this construction. In the latter context, X is Okamoto's space of initial conditions and D is the pole divisor of the symplectic form defining the Hamiltonian

On the Fully Commutative Elements of Coxeter Groups

by John R. Stembridge , 1996
"... Let W be a Coxeter group. We define an element we W to be fully commutative if any reduced expression for w can be obtained from any other by means of braid relations that only involve commuting generators. We give several combinatorial characterizations of this property, classify the Coxeter grou ..."
Abstract - Cited by 101 (4 self) - Add to MetaCart
groups with finitely many fully commutative elements, and classify the parabolic quotients whose members are all fully commutative. As applications of the latter, we classify all parabolic quotients with the property that (1) the Bruhat ordering is a lattice, (2) the Bruhat ordering is a distributive

COHOMOLOGY OF FINITE GROUP SCHEMES OVER A FIELD

by Eric M. Friedlander, Andrei Suslin
"... A finite group scheme G over a field k is equivalent to its coordinate algebra, a finite dimensional commutative Hopf algebra k[G] over k. In many contexts, it is natural to consider the rational (or Hochschild) cohomology of G with coefficients in a k[G]-comodule M. This is naturally isomorphic to ..."
Abstract - Cited by 111 (14 self) - Add to MetaCart
to the cohomology of the dual cocommutative Hopf algebra k[G] # with coefficients in the k[G] #-module M. In this latter formulation, we encounter familiar examples of the cohomology of group algebras kπ of a finite groups π and of restricted enveloping algebras V (g) of finite dimensional restricted Lie algebras

Trading costs and returns for US equities: estimating effective costs from daily data

by Joel Hasbrouck, Jay Shanken, Kumar Venkataraman, Sunil Wahal - Journal of Finance , 2009
"... The effective cost of trading is usually estimated from transaction-level data. This study proposes a Gibbs estimate that is based on daily closing prices. In a validation sample, the daily Gibbs estimate achieves a correlation of 0.965 with the transactionlevel estimate. When the Gibbs estimates ar ..."
Abstract - Cited by 117 (1 self) - Add to MetaCart
the sample to the post-1983 period of common coverage or use the longer historical sample with liquidity proxies estimated from daily data. This paper falls into the latter group. Specifically, I propose a new approach to estimating the effective cost of trading and the common variation in this cost

Multielement visual tracking: Attention and perceptual organization

by Steven Yantis, Johns Hopkins, Chris Chemiak - Cognitive Psychology , 1992
"... Two types of theories have been advanced to account for how attention is allocated in performing goal-directed visual tasks. According to location-based theories, visual attention is allocated to spatial locations in the image; according to object-based theories, attention is allocated to perceptual ..."
Abstract - Cited by 133 (3 self) - Add to MetaCart
to perceptual objects. Evidence for the latter view comes from experiments demonstrating the importance of perceptual grouping in selective-attention tasks. This article provides further evidence concerning the importance of perceptual organization in attending to objects. In seven experiments, observers
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