We develop an online variational Bayes (VB) algorithm for Latent Dirichlet Allocation (LDA). Online LDA is based on online stochastic optimization with a natural gradient step, which we show converges to a local optimum of the VB objective function. It can handily analyze massive document collections, including those arriving in a stream. We study the performance of online LDA in several ways, ...

The power of projection using divergence functions is a major theme in information geometry. One version of this is the variational Bayes (VB) method. This paper looks at VB in the context of other projection-based methods in information geometry. It also describes how to apply VB to the regime-switching log-normal model and how it provides a computationally fast solution to quantify the uncert...

In this paper, virtual cell layout (VCL) based dynamic source routing (VB-DSR) technique is introduced for the mobile subsystem of the next generation tactical communications systems. VB-DSR uses dynamic source routing (DSR) protocol over VCL structure, which is a resource management and clustering technique for tactical communications. The application of the third generation personal communica...

Objectives The aim of this study was to compare root canal volume change and canal transportation by Vortex Blue (VB; Dentsply Tulsa Dental Specialties), ProTaper Next (PTN; Dentsply Maillefer), and ProTaper Universal (PTU; Dentsply Maillefer) nickel-titanium rotary files in curved root canals. Materials and Methods Thirty canals with 20°-45° of curvature from extracted human molars were used...

AIM To carry out comparison and correlation analyses of the intervertebral disc (IVD) and vertebral body (VB) volumes in magnetic resonance (MR) images of patients with degenerated and nondegenerated lumbar discs. MATERIALS AND METHODS MR images were examined retrospectively in 93 patients. Lumbar VB and IVD volumes in T1-T2 weighted sagittal MR images were calculated via the Cavalieri method...

The mechanism for the diffusion of vinyl bromide (VB) through the nonporous van der Waals organic solid of p-tert-butylcalix[4]arene (tBC) is examined by molecular mechanics calculations. In a "squeeze" mechanism, a VB molecule passes through the interstitial space in the rim regions of tBC bowls, after the partial filling of nearby inclusion sites, and couples with the both the rotation of but...

line (90-265 Vac) applications with a hold-up time requirement. As shown in Chapter 5, the difficulty of these SPFC circuits to deal with a wide line range and long hold-up time requirement stems from the fact that the voltage of the energy-storage capacitor, VB, varies with the line voltage and load current. In most applications, with a proper design, VB(max) can be kept in the 400-420 Vdc ran...

RATIONALE AND OBJECTIVES The segmentation of airways from CT images is a critical first step for numerous virtual bronchoscopic (VB) applications. Automatic or semiautomatic methods are necessary, since manual segmentation is prohibitively time consuming. The methods must be robust and operate within a reasonable time frame to be useful for clinical VB use. The authors developed an integrated a...

Equations for calculating track parameters have been proposed, which invariably involve the track etch rate Vt and the bulk etch rate Vb. The present study measured Vb for the LR115 solid-state nuclear track detector using atomic force microscopy (AFM). The detectors were partially masked using rubber cement and then etched in 2:5 N NaOH solution at 60◦C for time periods ranging from 5 to 40 mi...