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- IBM Research - Thomas J. Watson Research CenterUS7 papers
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9 papers · 1 filter
Session Initiation Protocol (SIP) Server Overload Control: Design and Evaluation
Charles Shen, Henning Schulzrinne, Erich Nahum
A Session Initiation Protocol (SIP) server may be overloaded by emergency-induced call volume, ``American Idol'' style flash crowd effects or denial of service attacks. The SIP ser…
On Cycles in AS Relationships
Xenofontas Dimitropoulos, M. Angeles Serrano, Dmitri Krioukov
Several users of our AS relationship inference data (http://www.caida.org/data/active/as-relationships/), released with cs/0604017, asked us why it contained AS relationship cycles…
Field-induced quantum critical route to a Fermi liquid in high-temperature superconductors
T. Shibauchi, L. Krusin-Elbaum, M. Hasegawa +3
In high transition temperature (T_c) superconductivity, charge doping is a natural tuning parameter that takes copper oxides from the antiferromagnet to the superconducting region.…
Computational study of exciton generation in suspended carbon nanotube transistors
Siyuranga O. Koswatta, Vasili Perebeinos, Mark S. Lundstrom +1
Optical emission from carbon nanotube transistors (CNTFETs) has recently attracted significant attention due to its potential applications. In this paper, we use a self-consistent…
The Stellar Initial Mass Function in 2007: A Year for Discovering Variations
Bruce G. Elmegreen
The characteristic mass M_c and slope Gamma of the IMF are reviewed for clusters, field regions, galaxies, and regions formed during cosmological times. Local star formation has a…
Simulation of Many-Body Hamiltonians using Perturbation Theory with Bounded-Strength Interactions
Sergey Bravyi, David P. DiVincenzo, Daniel Loss +1
We show how to map a given n-qubit target Hamiltonian with bounded-strength k-body interactions onto a simulator Hamiltonian with two-body interactions, such that the ground-state…