Institution
Alcatel-Lucent
Stuttgart, Germany•
About: Alcatel-Lucent is a based out in Stuttgart, Germany. It is known for research contribution in the topics: Signal & Network packet. The organization has 37003 authors who have published 53332 publications receiving 1430547 citations. The organization is also known as: Alcatel-Lucent S.A. & Alcatel.
Topics: Signal, Network packet, Base station, Optical fiber, Node (networking)
Papers published on a yearly basis
Papers
More filters
••
TL;DR: An introductory survey of the theoretical ideas and calculations and experimental results which depart from Landau Fermi liquids is presented in this paper, where the common themes and possible routes to the singularities leading to breakdown of Landau fermi liquid are categorized.
277 citations
••
TL;DR: A weak positive correlation between CBF andCMRO2 changes was observed, suggesting the CMRO2 increase is proportional to the CBF increase.
Abstract: The blood oxygenation level-dependent (BOLD) effect in functional magnetic resonance imaging depends on at least partial uncoupling between cerebral blood flow (CBF) and cerebral metabolic rate of oxygen (CMRO2) changes. By measuring CBF and BOLD simultaneously, the relative change in CMRO2 can be estimated during neural activity using a reference condition obtained with known CMRO2 change. In this work, nine subjects were studied at a magnetic field of 1.5 T; each subject underwent inhalation of a 5% carbon dioxide gas mixture as a reference and two visual stimulation studies. Relative CBF and BOLD signal changes were measured simultaneously using the flow-sensitive alternating inversion recovery (FAIR) technique. During hypercapnia established by an end-tidal CO2 increase of 1.46 kPa, CBF in the visual cortex increased by 47.3 +/- 17.3% (mean +/- SD; n = 9), and deltaR2* was -0.478 +/- 0.147 sec(-1), which corresponds to BOLD signal change of 2.4 +/- 0.7% with a gradient echo time of 50 msec. During black/white visual stimulation reversing at 8 Hz, regional CBF increase in the visual cortex was 43.6 +/- 9.4% (n = 18), and deltaR2* was -0.114 +/- 0.086 sec(-1), corresponding to a BOLD signal change of 0.6 +/- 0.4%. Assuming that CMRO2 does not change during hypercapnia and that hemodynamic responses during hypercapnia and neural stimulation are similar, relative CMRO2 change was determined using BOLD biophysical models. The average CMRO2 change in the visual cortex ranged from 15.6 +/- 8.1% (n = 18) with significant cerebral blood volume (CBV) contribution to 29.6 +/- 18.8% without significant CBV contribution. A weak positive correlation between CBF and CMRO2 changes was observed, suggesting the CMRO2 increase is proportional to the CBF increase.
276 citations
••
University of Illinois at Urbana–Champaign1, Simon Fraser University2, National Institutes of Health3, Princeton University4, Alcatel-Lucent5, French Institute of Health and Medical Research6, Hungarian Academy of Sciences7, Uniformed Services University of the Health Sciences8, IBM9, University of Washington10, Illinois State University11, Emory University12
276 citations
••
22 May 2005TL;DR: In this paper, the authors propose and realize a definition of security for password-based key exchange within the framework of universally composable (UC) security, thus providing security guarantees under arbitrary composition with other protocols.
Abstract: We propose and realize a definition of security for password-based key exchange within the framework of universally composable (UC) security, thus providing security guarantees under arbitrary composition with other protocols. In addition, our definition captures some aspects of the problem that were not adequately addressed by most prior notions. For instance, it does not assume any underlying probability distribution on passwords, nor does it assume independence between passwords chosen by different parties. We also formulate a definition of password-based secure channels, and show that such a definition is achievable given password-based key exchange.
Our protocol realizing the new definition of password-based key exchange is in the common reference string model and relies on standard number-theoretic assumptions. The components of our protocol can be instantiated to give a relatively efficient solution which is conceivably usable in practice. We also show that it is impossible to satisfy our definition in the “plain” model (e.g., without a common reference string).
275 citations
•
21 Jun 2001TL;DR: A user authentication service for a communication network authenticates local users before granting them access to personalized sets of network resources as discussed by the authors, where authentication agents on intelligent edge devices present users of associated end systems with log-in challenges.
Abstract: A user authentication service for a communication network authenticates local users before granting them access to personalized sets of network resources. Authentication agents on intelligent edge devices present users of associated end systems with log-in challenges. Information supplied by the users is forwarded to an authentication server for verification. If successfully verified, the authentication server returns to the agents authorized connectivity information and time restrictions for the particular authenticated users. The agents use the information to establish rules for filtering and forwarding network traffic originating from or destined for particular authenticated users during authorized time periods. An enhanced authentication server may be engaged if additional security is desired. The authorized connectivity information preferably includes identifiers of one or more virtual local area networks active in the network. Log-in attempts are recorded so that the identity and whereabouts of network users may be monitored from a network management station.
275 citations
Authors
Showing all 37011 results
Name | H-index | Papers | Citations |
---|---|---|---|
George M. Whitesides | 240 | 1739 | 269833 |
Yoshua Bengio | 202 | 1033 | 420313 |
John A. Rogers | 177 | 1341 | 127390 |
Zhenan Bao | 169 | 865 | 106571 |
Thomas S. Huang | 146 | 1299 | 101564 |
Federico Capasso | 134 | 1189 | 76957 |
Robert S. Brown | 130 | 1243 | 65822 |
Christos Faloutsos | 127 | 789 | 77746 |
Robert J. Cava | 125 | 1042 | 71819 |
Ramamoorthy Ramesh | 122 | 649 | 67418 |
Yann LeCun | 121 | 369 | 171211 |
Kamil Ugurbil | 120 | 536 | 59053 |
Don Towsley | 119 | 883 | 56671 |
Steven P. DenBaars | 118 | 1366 | 60343 |
Robert E. Tarjan | 114 | 400 | 67305 |