Results 11 - 20 of 29,112

ASTRONOMY AND ASTROPHYSICS

by J. -l. Zhou, Y. -s. Sun, J. -q. Zheng, M. J. Valtonen , 2000
"... The transfer of comets from near-parabolic to short-period orbits: map approach ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
The transfer of comets from near-parabolic to short-period orbits: map approach

X-mac: A short preamble mac protocol for duty-cycled wireless sensor networks

by Michael Buettner, Gary V. Yee, Eric Anderson, Richard Han - in SenSys , 2006
"... In this paper we present X-MAC, a low power MAC protocol for wireless sensor networks (WSNs). Standard MAC protocols developed for duty-cycled WSNs such as B-MAC, which is the default MAC protocol for TinyOS, employ an extended preamble and preamble sampling. While this “low power listening ” approa ..."
Abstract - Cited by 360 (0 self) - Add to MetaCart
significantly reduces energy usage at both the transmitter and receiver, reduces per-hop latency, and offers additional advantages such as flexible adaptation to both bursty and periodic sensor data sources.

Meme-tracking and the Dynamics of the News Cycle

by Jure Leskovec , Lars Backstrom, Jon Kleinberg , 2009
"... Tracking new topics, ideas, and “memes” across the Web has been an issue of considerable interest. Recent work has developed methods for tracking topic shifts over long time scales, as well as abrupt spikes in the appearance of particular named entities. However, these approaches are less well suite ..."
Abstract - Cited by 363 (15 self) - Add to MetaCart
suited to the identification of content that spreads widely and then fades over time scales on the order of days — the time scale at which we perceive news and events. We develop a framework for tracking short, distinctive phrases that travel relatively intact through on-line text; developing scalable

Constraints on Short-selling and Asset Price Adjustment to Private Information

by Douglas W. Diamond, Robert E. Verrecchia - Journal of Financial Economics , 1987
"... This paper models effects of short-sale constraints on the speed of adjustment (to private information) of security prices. Constraints eliminate some informative trades, but do not bias prices upward. Prohibiting traders from shorting reduces the adjustment speed of prices to private information, e ..."
Abstract - Cited by 302 (3 self) - Add to MetaCart
, especially to bad news. Non-prohibitive costs can have the reverse effect, but this is unlikely. Implications are developed about return distributions on information announcement dates. Periods of inactive trade are shown to impart a downward bias to measured returns. An unexpected increase in the short

Bad news travels slowly: Size, analyst coverage, and the profitability of momentum strategies

by Harrison Hong, Terence Lim, Jeremy C. Stein - Journal of Finance , 2000
"... Various theories have been proposed to explain momentum in stock returns. We test the gradual-information-diffusion model of Hong and Stein (1999) and establish three key results. First, once one moves past the very smallest stocks, the profitability of momentum strategies declines sharply with firm ..."
Abstract - Cited by 339 (25 self) - Add to MetaCart
. For example, Jegadeesh and Titman (1993), using a U.S. sample of NYSE/ AMEX stocks over the period from 1965 to 1989, find that a strategy that buys past six-month winners (stocks in the top performance decile) and shorts past six-month losers (stocks in the bottom performance decile) earns approximately one

Internet Quarantine: Requirements for Containing Self-Propagating Code

by David Moore, Colleen Shannon, Geoffrey M. Voelker, Stefan Savage , 2003
"... It has been clear since 1988 that self-propagating code can quickly spread across a network by exploiting homogeneous security vulnerabilities. However, the last few years have seen a dramatic increase in the frequency and virulence of such "worm" outbreaks. For example, the Code-Red worm ..."
Abstract - Cited by 324 (10 self) - Add to MetaCart
epidemics of 2001 infected hundreds of thousands of Internet hosts in a very short period -- incurring enormous operational expense to track down, contain, and repair each infected machine. In response to this threat, there is considerable effort focused on developing technical means for detecting

Oligomorphic permutation groups

by Peter J. Cameron - LONDON MATHEMATICAL SOCIETY STUDENT TEXTS , 1999
"... A permutation group G (acting on a set Ω, usually infinite) is said to be oligomorphic if G has only finitely many orbits on Ω n (the set of n-tuples of elements of Ω). Such groups have traditionally been linked with model theory and combinatorial enumeration; more recently their group-theoretic pro ..."
Abstract - Cited by 320 (26 self) - Add to MetaCart
A permutation group G (acting on a set Ω, usually infinite) is said to be oligomorphic if G has only finitely many orbits on Ω n (the set of n-tuples of elements of Ω). Such groups have traditionally been linked with model theory and combinatorial enumeration; more recently their group

Thin slices of expressive behavior as predictors of interpersonal consequences: A meta-analysis

by Nalini Ambady, Robert Rosenthal - Psychological Bulletin , 1992
"... A meta-analysis was conducted on the accuracy of predictions of various objective outcomes in the areas of social and clinical psychology from short observations of expressive behavior (under 5 min). The overall effect size (/) for the accuracy of predictions for 38 different results was.39. Studies ..."
Abstract - Cited by 320 (16 self) - Add to MetaCart
A meta-analysis was conducted on the accuracy of predictions of various objective outcomes in the areas of social and clinical psychology from short observations of expressive behavior (under 5 min). The overall effect size (/) for the accuracy of predictions for 38 different results was.39

Symbolic dynamics and periodic orbits for the cardioid billiard

by A. Bäcker, H. R. Dullin - J. PHYS. A , 1997
"... : The periodic orbits of the strongly chaotic cardioid billiard are studied by introducing a binary symbolic dynamics. The corresponding partition is mapped to a topological well-ordered symbol plane. In the symbol plane the pruning front is obtained from orbits running either into or through the c ..."
Abstract - Cited by 18 (8 self) - Add to MetaCart
of families of periodic orbits accumulating in length and that all other families of geometrically short periodic orbits eventually get pruned. All these orbits are related to finite orbits starting and ending in the cusp. We obtain an analytical estimate of the Kolmogorov-Sinai entropy and find good

Accurate short-term analysis of the fundamental frequency and the harmonics-to-noise ratio of a sampled sound

by Paul Boersma - IFA Proceedings 17 , 1993
"... We present a straightforward and robust algorithm for periodicity detection, working in the lag (autocorrelation) domain. When it is tested for periodic signals and for signals with additive noise or jitter, it proves to be several orders of magnitude more accurate than the methods commonly used for ..."
Abstract - Cited by 260 (4 self) - Add to MetaCart
We present a straightforward and robust algorithm for periodicity detection, working in the lag (autocorrelation) domain. When it is tested for periodic signals and for signals with additive noise or jitter, it proves to be several orders of magnitude more accurate than the methods commonly used
Results 11 - 20 of 29,112