A powerful approach to finding errors in computer software is to translate a given program into a verification condition, a logical formula that is valid if and only if the program is free of the classes of errors under consideration. Finding errors in the program is then done by mechanically searching for counterexamples to the verification condition. This paper gives an overview of the techno...

HENRY A. JOHNSON, 0000 MARK E. JOHNSON, 0000 DINCHEN A. KLEIN, 0000 LAURA A. KNABB, 0000 KIRK A. KREISEL, 0000 ARRON W. LAYTON, 0000 TIFFANY A. LEHANE, 0000 GREGORY D. LEWIS, 0000 JEFFREY M. LISAK, 0000 RONALD B. LOTT, JR., 0000 JAMES MATHES, 0000 TODD D. MOORE, 0000 JEFFREY A. NESHEIM, 0000 RICK L. NICKERSON, 0000 GREGORY J. OSTIDIEK, 0000 NANNETTE M. PACO, 0000 CHRISTOPHER F. POULIOT, 0000 JA...

In the terms of operational calculus the probability characteristics of direct and reverse residual renewal time of alternating renewal process, where renewal time depends on life-time, are found. 1. Definitions, Motivations and Formulation of the Problem 1.1 According to [1] let’s consider a system which fails after random life-time X1 and is fully renewed after the lapse of random time Y1. Th...

Despite the enormous media coverage that the issue of year 2000 (Y2K) readiness has received in recent months, the focus of that coverage has been restricted almost exclusively to technological aspects. Non-technical issues have tended to be either ignored completely or given very little attention. Most importantly, not much is known about the organisational processes of preparing to face this ...

Arteriovenous malformations (AVMs) are congenital anomalies of the cerebrovasculature with poorly formed blood vessels that shunt blood directly from the arterial circulation to the venous system bypassing the capillary network. The high pressures and flow rates in AVM vessels combined with poor construction of the abnormal shunting vessel walls make them prone to rupture and intracranial hemor...

I discuss the physics reach of a fixed-target charm experiment which can reconstruct >10 charm decays, three orders of magnitude beyond the largest extant sample. Such an experiment may run at Fermilab shortly after the Year 2000. In addition to “programmatic” charm physics such as spectroscopy, lifetimes, and tests of QCD, this “Charm2000” experiment will have significant sensitivity to new ph...

The Image Reduction and Analysis Facility is a scientific image processing package widely used throughout the astronomical community. IRAF has been developed and distributed by the National Optical Astronomy Observatory in Tucson, Arizona since the early 1980’s. Other observatories and projects have written many dozens of layered external application packages. More than ten thousand journal art...

PUBLISHED BY THE IEEE COMPUTER SOCIETY 1540-7993/03/$17.00 © 2003 IEEE IEEE SECURITY & PRIVACY 35 O n the evening of 2 November 1988, a brush fire got out of control on the Internet and set at least one computer in 20 on fire, figuratively speaking. This was due to an event that was either the Internet’s first mobile agent experiment or a new entry in the annals of computer vandalism: the infam...