Alcatel-Lucent

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.

Cut ranking and pruning: enabling a general and efficient FPGA mapping solution

Abstract: Cut enumeration is a common approach used in a number of FPGA synthesis and mapping algorithms for consideration of various possible LUT implementations at each node in a circuit. Such an approach is very general and flexible, but often suffers high computational complexity and poor scalability. In this paper, we develop several efficient and effective techniques on cut enumeration, ranking and pruning. These techniques lead to much better runtime and scalability of the cut-enumeration based algorithms; they can also be used to compute a tight lower-bound on the size of an area-minimum mapping solution. For area-oriented FPGA mapping, experimental results show that the new techniques lead to over 160X speed-up over the original optimal duplication-free mapping algorithm, achieve mapping solutions with 5-21% smaller area for heterogeneous FPGAs compared to those by Chortle-crf, MIS-pga-new, and TOS-TUM, yet with over 100X speed-up over MIS-pganew and TOS-TUM.

Constraining New Forces in the Casimir Regime Using the Isoelectronic Technique

Abstract: We report the first isoelectronic differential force measurements between an Au-coated probe and two Au-coated films, made out of Au and Ge. These measurements, performed at submicron separations using soft microelectromechanical torsional oscillators, eliminate the need for a detailed understanding of the probe-film Casimir interaction. The observed differential signal is directly converted into limits on the parameters $\ensuremath{\alpha}$ and $\ensuremath{\lambda}$ which characterize Yukawa-like deviations from Newtonian gravity. We find $\ensuremath{\alpha}\ensuremath{\lesssim}{10}^{12}$ for $\ensuremath{\lambda}\ensuremath{\sim}200\text{ }\text{ }\mathrm{nm}$, an improvement of $\ensuremath{\sim}10$ over previous limits.

Amorphouslike density of gap states in single-crystal pentacene.

Abstract: We show that optical and electrical measurements on pentacene single crystals can be used to extract the density of states in the highest occupied molecular orbital-lowest unoccupied molecular orbital band gap. It is found that these highly purified crystals possess band tails broader than those typically observed in inorganic amorphous solids. Results on field-effect transistors fabricated from similar crystals imply that the gap state density is much larger within 5-10 nm of the gate dielectric. Thus, organic thin-film transistors for such applications as flexible displays might be significantly improved by reducing these defects.

Weak-Lensing Results from the 75 Square Degree Cerro Tololo Inter-American Observatory Survey

Abstract: We measure seeing-corrected ellipticities for 2 × 106 galaxies with magnitude R ≤ 23 in 12 widely separated fields totaling 75 deg2 of sky. At angular scales 30', ellipticity correlations are detected at high significance and exhibit nearly the pure "E mode" behavior expected of weak gravitational lensing. Even when smoothed to the full field size of 25, which is ≈25 h-1 Mpc at the lens distances, an rms shear variance of γ21/2 = 0.0012 ± 0.0003 is detected. At smaller angular scales, there is significant "B-mode" power, an indication of residual uncorrected point-spread function distortions. The data at scales above 30' constrain the power spectrum of matter fluctuations on comoving scales of ≈10 h-1 Mpc to have σ8(Ωm/0.3)0.57 = 0.71 (95% confidence level, ΛCDM, Γ = 0.21), where the systematic error includes statistical and calibration uncertainties, cosmic variance, and a conservative estimate of systematic contamination based upon the detected B-mode signal. This normalization of the power spectrum is lower than, but generally consistent with, previous weak-lensing results, is at the lower end of the σ8 range from various analyses of galaxy cluster abundances, and agrees with recent determinations from cosmic microwave background and galaxy clustering. The large and dispersed sky coverage of our survey reduces random errors and cosmic variance, while the relatively shallow depth allows us to use existing redshift survey data to reduce systematic uncertainties in the N(z) distribution to insignificance. Reanalysis of the data with more sophisticated algorithms will hopefully reduce the systematic (B mode) contamination and allow more precise, multidimensional constraint of cosmological parameters.