Alignment in total knee arthroplasty : what’s in a name?

Dissatisfaction following total knee arthroplasty is a well-documented phenomenon. Although many factors have been implicated, including modifiable and nonmodifiable patient factors, emphasis over the past decade has been on implant alignment and stability as both a cause of, and a solution to, this problem. Several alignment targets have evolved with a proliferation of techniques following the introduction of computer and robotic-assisted surgery. Mechanical alignment targets may achieve mechanically-sound alignment while ignoring the soft tissue envelope; kinematic alignment respects the soft tissue envelope while ignoring the mechanical environment. Functional alignment is proposed as a hybrid technique to allow mechanically-sound, soft tissue-friendly alignment targets to be identified and achieved

Ph-Metrie oesophagienne a double canal dans le diagnostic du reflux gastro-oesophagien Avec manifestations ORL

Objectif : Déterminer la fréquence du reflux proximal pathologique chez des patients présentant un reflux gastro-oesophagien (RgO) avec manifestations oto-rhino-laryngologiques (ORL) et explorés par une ph-métrie oesophagienne des 24 heures, utilisant une sonde à double canal, déterminer le taux de concordance entre les symptômes ORL et les épisodes de RgO proximal et enfin, rechercher des facteurs  épidémiologiques, cliniques et ph-métriques distaux associés à un plus grand risque de survenue de RgO proximal. : Nous avons revu tous les tracés et comptes rendus des phmétries oesophagiennes des 24 heures à double canal pratiquées entre 2008 et 2010, pour exploration de  manifestations ORL de RgO.Matériel et méthodes : Nous avons revu tous les tracés et comptes rendus des ph-métries oesophagiennes des 24 heures à double canal pratiquées entre 2008 et 2010, pour exploration de manifestations ORL de RgO.Résultats : il s’agissait de 33 patients, d’âge moyen de 43,2 ans (10-73 ans). Un reflux proximal pathologique a été retrouvé chez 27 patients. Il était associé à un reflux distal chez 16 patients et isolé chez 11 patients. Un reflux proximal nocturne pathologique a été retrouvé chez 13 patients. Une bonne concordance symptomatique a été retrouvée chez 9 malades. Concernant les facteurs prédictifs du reflux proximal pathologique, nous avons retrouvé une corrélation statistiquement significative avec l’existence d’un reflux distal associé et l’existence d’un reflux distal nocturne.Conclusion : en attendant le développement et la diffusion de   l’impédancemétrie oesophagienne, la ph-métrie oesophagienne utilisant une sonde à double canal doit être proposée à tous les patients souffrant d’un RgO avec manifestations ORL.Mots-clés : reflux gastro-oesophagien, ph-métrie oesophagienne des 24 heures, oto-rhino-laryngologie

Detariffing and the Death of the Filed Tariff Doctrine: Deregulating in the “Self” Interest

This Article reviews the history of the FCC\u27s detariffing efforts, addressing the major issue raised not so much by detariffing itself, but by the FCC\u27s view of detariffing orders impact on the Filed Tariff Doctrine. Notwithstanding the existence of the Doctrine for nearly a century, the FCC, through detariffing, has declared the Doctrine dead. This Article formally opposes the FCC\u27s declaration and suggests that the FCC\u27s motivations behind detariffing have failed to consider, much less attempted to properly balance, the conflicting public interests involved. Comparing and contrasting the legal rights enjoyed by long-distance carriers under the Filed Tariff Doctrine to the rights and potential liabilities of carriers in its absence, this Article discusses the actions several states have taken immediately following the July 31, 2001 effective date of the FCC\u27s mass-market detariffing order. The Article concludes that the FCC\u27s action is a manifest injustice to both carriers and consumers alike, and is a prime example of irresponsible agency regulation

Training deep neural density estimators to identify mechanistic models of neural dynamics

Mechanistic modeling in neuroscience aims to explain observed phenomena in terms of underlying causes. However, determining which model parameters agree with complex and stochastic neural data presents a significant challenge. We address this challenge with a machine learning tool which uses deep neural density estimators-- trained using model simulations-- to carry out Bayesian inference and retrieve the full space of parameters compatible with raw data or selected data features. Our method is scalable in parameters and data features, and can rapidly analyze new data after initial training. We demonstrate the power and flexibility of our approach on receptive fields, ion channels, and Hodgkin-Huxley models. We also characterize the space of circuit configurations giving rise to rhythmic activity in the crustacean stomatogastric ganglion, and use these results to derive hypotheses for underlying compensation mechanisms. Our approach will help close the gap between data-driven and theory-driven models of neural dynamics

Applicability of Modified Effective-Range Theory to positron-atom and positron-molecule scattering

We analyze low-energy scattering of positrons on Ar atoms and N2 molecules using Modified Effective-Range Theory (MERT) developped by O'Malley, Spruch and Rosenberg [Journal of Math. Phys. 2, 491 (1961)]. We use formulation of MERT based on exact solutions of Schroedinger equation with polarization potential rather than low-energy expansions of phase shifts into momentum series. We show that MERT describes well experimental data, provided that effective-range expansion is performed both for s- and p-wave scattering, which dominate in the considered regime of positron energies (0.4 - 2 eV). We estimate the values of the s-wave scattering lenght and the effective range for e+ - Ar and e+ - N2 collisions.Comment: RevTeX, 4 pages, 2 figure

Small gain versus positive real modeling of real parameter uncertainty

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76326/1/AIAA-20872-692.pd

Retrospective-Cost Adaptive Control of Uncertain Hammerstein Systems Using a NARMAX Controller Structure

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/97107/1/AIAA2012-4448.pd

A High Performance Command and Data Handling System for NASA's Lunar Reconnaissance Orbiter

A high performance, modular and state-of-the-art Command and Data Handling (C&DH) system has been developed for use on the Lunar Reconnaissance Orbiter (LRO) mission. This paper addresses the hardware architecture, the operational performance, and the fabrication technology

Disorder effects on infrared reflection spectra of InN films

The effect of plasmon and LO-phonon damping on the optical measurements of InN films is discussed. Phonon and plasmon damping dramatically modifies the spectral features of the optical spectra and destabilizes the coupled modes of the system. Phonon damping affects the optical properties in a qualitatively different way from plasmon damping. Increased phonon damping leads to a merging of the coupled modes for a certain range of carrier density. Plasmon damping broadens the spectral linewidths of both of the coupled modes when plasmon energies are of the order of LO-phonon energies. However, when plasmon energies are larger than LO-phonon energies, increasing plasmon damping makes the higher-energy mode completely degenerate with plasmon, and may even have lower energies than plasmon. In weakly damped situations, we also discuss the low-energy optical transmission region that forms in between the coupled modes. Finally, the effect of plasmon and LO-phonon coupling on the analyses of the experimental infrared reflection data of InN films (for different electron densities) is discussed. © 2004 American Institute of Physics.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/71000/2/JAPIAU-95-9-4795-1.pd

Renormalization Group calculations with k|| dependent couplings in a ladder

We calculate the phase diagram of a ladder system, with a Hubbard interaction and an interchain coupling $t_\perp$. We use a Renormalization Group method, in a one loop expansion, introducing an original method to include $k_{||}$ dependence of couplings. We also classify the order parameters corresponding to ladder instabilities. We obtain different results, depending on whether we include $k_{||}$ dependence or not. When we do so, we observe a region with large antiferromagnetic fluctuations, in the vicinity of small $t_\perp$, followed by a superconducting region with a simultaneous divergence of the Spin Density Waves channel. We also investigate the effect of a non local backward interchain scattering : we observe, on one hand, the suppression of singlet superconductivity and of Spin Density Waves, and, on the other hand, the increase of Charge Density Waves and, for some values of $t_\perp$, of triplet superconductivity. Our results eventually show that $k_{||}$ is an influential variable in the Renormalization Group flow, for this kind of systems.Comment: 20 pages, 19 figures, accepted in Phys. Rev. B 71 v. 2