A formulation of the differential-air-path problem for a large-baseline optical interferometer is presented. Because air is a dispersive medium, each wavelength has a different optical path length. This can be corrected to a large extent if an extra piece of glass is placed in each arm of the interferometer. The problem then becomes analogous to the doublet-achromat design, in which, in this ca...

This paper investigates the impact of using directional antennas and beamforming schemes on the connectivity of cognitive radio ad hoc networks (CRAHNs). Specifically, considering that secondary users use two kinds of directional antennas, i.e., uniform linear array (ULA) and uniform circular array (UCA) antennas, and two different beamforming schemes, i.e., randomized beamforming and center-di...

In this paper we propose a large{step analytic center method for smooth convex programming. The method is a natural implementation of the classical method of centers. It is assumed that the objective and constraint functions ful l the socalled Relative Lipschitz Condition, with Lipschitz constant M > 0. A great advantage of the method, above the existing path{following methods, is that the step...

We consider two problems that arise in designing two-level star networks taking into account service quality considerations. Given a set of nodes with pairwise traffic demand and a central hub, we select p hubs and connect them to the central hub with direct links and then we connect each nonhub node to a hub. This results in a star/star network. In the first problem, called the Star p-hub Cent...

BACKGROUND Single-limb stance is maintained via the integration of visual, vestibular and somatosensory afferents. Musculoskeletal injury challenges the somatosensory system to reweight distorted sensory afferents. This investigation supplements kinetic analysis of eyes-open and eyes-closed single-limb stance tasks with a kinematic profile of lower limb postural orientation in an acute lateral ...

in the current age, having entrepreneur approach to public administration in public organizations is one of the critical issues that affect the output of the organizations, especially in developing and less developing countries. although the approach is vital for public organizations, but unfortunately, few studies focused on it. the nature of the study is quantitative and based on applied and ...

—Packet loss degrades the performance of various cloud services and reliability still plays a critical role in data center network. In this paper, we propose an approach to achieve reliability by strategically spreading traffic onto concurrent multiple paths while FEC is employed. Moreover, to fully develop the potential of path diversity, the rate allocation problem across multiple paths is s...

The obnoxious center problem in a graph G asks for a location on an edge of the graph such that the minimum weighted distance from this point to a vertex of the graph is as large as possible. We derive algorithms with linear running time for the cases when G is a path or a star, thus improving previous results of Tamir. For subdivided stars we present an algorithm of running time O(n log n). Fo...

1 Novartis Foundation, Novartis Campus, Basel, Switzerland, 2 School of Medicine, University of Aberdeen, Aberdeen, Scotland, United Kingdom, 3 Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, United States of America, 4 PATH, Seattle, Washington, United States of America, 5 Infectious Disease Research Institute, Seattle, Washington, Unite...