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Brain magnetic resonance imaging with contrast dependent on blood oxygenation.

by S Ogawa , T M Lee , A R Kay , D W Tank - Proc. Natl. Acad. Sci. USA , 1990
"... ABSTRACT Paramagnetic deoxyhemoglobin in venous blood is a naturally occurring contrast agent for magnetic resonance imaging (MRI). By accentuating the effects of this agent through the use of gradient-echo techniques in high fields, we demonstrate in vivo images of brain microvasculature with imag ..."
Abstract - Cited by 648 (1 self) - Add to MetaCart
ABSTRACT Paramagnetic deoxyhemoglobin in venous blood is a naturally occurring contrast agent for magnetic resonance imaging (MRI). By accentuating the effects of this agent through the use of gradient-echo techniques in high fields, we demonstrate in vivo images of brain microvasculature

Query by Committee

by H. S. Seung, M. Opper, H. Sompolinsky , 1992
"... We propose an algorithm called query by committee, in which a committee of students is trained on the same data set. The next query is chosen according to the principle of maximal disagreement. The algorithm is studied for two toy models: the high-low game and perceptron learning of another perceptr ..."
Abstract - Cited by 432 (3 self) - Add to MetaCart
perceptron. As the number of queries goes to infinity, the committee algorithm yields asymptotically finite information gain. This leads to generalization error that decreases exponentially with the number of examples. This in marked contrast to learning from randomly chosen inputs, for which the information

On The Limits of Steganography

by Ross Anderson, Fabien Petitcolas - IEEE Journal of Selected Areas in Communications , 1998
"... In this paper, we clarify what steganography is and what it can do. We contrast it with the related disciplines of cryptography and tra#c security, present a unified terminology agreed at the first international workshop on the subject, and outline a number of approaches---many of them developed to ..."
Abstract - Cited by 413 (2 self) - Add to MetaCart
In this paper, we clarify what steganography is and what it can do. We contrast it with the related disciplines of cryptography and tra#c security, present a unified terminology agreed at the first international workshop on the subject, and outline a number of approaches---many of them developed

Advanced and Authenticated Marking Schemes for IP Traceback

by Dawn Xiaodong Song, Adrian Perrig - IN: PROCEEDINGS OF IEEE INFOCOM CONFERENCE , 2000
"... Defending against distributed denial-of-service attacks is one of the hardest security problems on the Internet today. One difficulty to thwart these attacks is to trace the sourec of the attacks because they often use incorrect, or spoofed IP source addresses to disguide the true origin. In this pa ..."
Abstract - Cited by 316 (7 self) - Add to MetaCart
. In this paper, we present two new schemes, the Advanced Marking Scheme and the Authenticated Marking Scheme, which allow the victim to traceback the approcimate origin of the spoofed Ip packets. Our techniques feature low network and router overhead, and support incremental deployment. In contrast to previous

How do glucocorticoids influence stress responses? Integrating permissive, suppressive, stimulatory and preparative actions. Endocrine Rev 21:55–89

by Robert M. Sapolsky, L. Michael Romero, Allan, U. Munck , 2000
"... The secretion of glucocorticoids (GCs) is a classic endocrine re-sponse to stress. Despite that, it remains controversial as to what purpose GCs serve at such times. One view, stretching back to the time of Hans Selye, posits that GCs help mediate the ongoing or pending stress response, either via b ..."
Abstract - Cited by 331 (8 self) - Add to MetaCart
basal levels of GCs permitting other facets of the stress response to emerge efficaciously, and/or by stress levels of GCs actively stimulating the stress response. In con-trast, a revisionist viewpoint posits that GCs suppress the stress response, preventing it from being pathologically overactivated

Exemplar dynamics: Word frequency, lenition and contrast

by Janet B. Pierrehumbert - In , 2001
"... Exemplar theory was first developed as a model of similarity and classification in perception. In this paper, the theory is extended to model speech production as well as speech perception. Straightforward extension of the model provides a formal framework for thinking about the quantitative predict ..."
Abstract - Cited by 243 (7 self) - Add to MetaCart
and entrenchment. A realistic treatment is also provided for the time course of a phonological merger which originates from lenition of a marked category. 1

G.: Primary production of the biosphere: Integrating terrestrial and oceanic components

by Christopher B. Field, Michael J. Behrenfeld, James T. R, Paul Falkowski - Science , 1998
"... Integrating conceptually similar models of the growth of marine and terrestrial primary producers yielded an estimated global net primary production (NPP) of 104.9 petagrams of carbon per year, with roughly equal contributions from land and oceans. Approaches based on satellite indices of absorbed s ..."
Abstract - Cited by 248 (6 self) - Add to MetaCart
solar ra-diation indicate marked heterogeneity in NPP for both land and oceans, re-flecting the influence of physical and ecological processes. The spatial and temporal distributions of ocean NPP are consistent with primary limitation by light, nutrients, and temperature. On land, water limitation

Contrastive topic marking in Avatime

by unknown authors
"... Contrastive topics have usually been defined as a topics which evoke ..."
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Contrastive topics have usually been defined as a topics which evoke

Prosodic marking of contrasts in information structure

by Markus Guhe, Mark Steedman, Ellen Gurman Bard, Max M. Louwerse - Dialogue, University of Potsdam , 2006
"... Successful dialogue requires cultivation of com-mon ground (Clark, 1996), shared information, which changes as the conversation proceeds. Dialogue partners can maintain common ground by using different modalities like eye gaze, facial expressions, gesture, content information or in-tonation. Here, w ..."
Abstract - Cited by 3 (3 self) - Add to MetaCart
, we focus on intonation and inves-tigate how contrast in information structure is prosodically marked in spontaneous speech. Combinatory Categorial Grammar (CCG, Steedman 2000) distinguishes theme and rheme as elements of information structure. In some cases they can be distinguished by the pitch ac

Minos: Control Data Attack Prevention Orthogonal to Memory Model

by Jedidiah R. Crandall, Frederic T. Chong , 2004
"... We introduce Minos, a microarchitecture that implements Biba's low-water-mark integrity policy on individual words of data. Minos stops attacks that corrupt control data to hijack program control flow but is orthogonal to the memory model. Control data is any data which is loaded into the progr ..."
Abstract - Cited by 202 (16 self) - Add to MetaCart
We introduce Minos, a microarchitecture that implements Biba's low-water-mark integrity policy on individual words of data. Minos stops attacks that corrupt control data to hijack program control flow but is orthogonal to the memory model. Control data is any data which is loaded
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