Upgrading V.D. departments.

Vd 2 Draft

T. Amdeberhan, V. De Angelis, and V.H. Moll study the arithmetical properties of the complementary Bell numbers using an infinite matrix P whose basis is the falling factorials. This paper constructs a similar matrix whose basis is the rising factorials and parallels many of the same results.

VD-AUTO-SMASH imaging.

Recently a self-calibrating SMASH technique, AUTO-SMASH, was described. This technique is based on PPA with RF coil arrays using auto-calibration signals. In AUTO-SMASH, important coil sensitivity information required for successful SMASH reconstruction is obtained during the actual scan using the correlation between undersampled SMASH signal data and additionally sampled calibration signals wi...

Hepatitis B antigen in VD clinic patients.

SIR,-Mr. T. H. Bloomfield (30 June, p. 779) challenges the validity of using blood donors in comparative studies of the incidence of hepatitis b antigenaemnia. The objection is that the exclusion of potential donors with a history of jaundice or of recent contract with a case of jaundice may reduce the proportion of subjects positive for hepatitis B antigen (HBAg) among those accepted for donat...

Upgrading Bottleneck Constrained Forests

We study bottleneck constrained network upgrading problems. We are given an edge weighted graph G = (V; E) where node v 2 V can be upgraded at a cost of c(v). This upgrade reduces the delay of each link emanating from v. The goal is to nd a minimum cost set of nodes to be upgraded so that the resulting network has a good performance. The performance is measured by the bottleneck weight of a con...

Learning for Upgrading