Dr. Constance E. Ruhl is an Epidemiologist at Social & Scientific Systems, Inc., Silver Spring, MD. Dr. Jeanne M. Clark is a Professor of Medicine and Epidemiology and Director of the Division of General Internal Medicine at The Johns Hopkins University, Baltimore, MD. Dr. James E. Everhart was Chief of the Epidemiology and Clinical Trials Branch in the Division of Digestive Diseases and Nutrit...

Current systems use caching to provide high performance and possibly support disconnected operation. However, current solutions are type specific. With the advent of modular distributed operating systems and mobile machines there is a need to provide generic support for implementing cacheable/disconnectable services. We present an architecture that can be used to implement cacheable/disconnecta...

This paper studies the solution behavior of a system of two coupled elastic beams connected vertically by springs. With the viscous damping collocated with the ends of the springs, the system energy decays exponentially. Our goal is to find the optimal spring-damper location which yields the best energy decay rate of the beam-spring system.

The SPring-8 beamline control system is now taking part in the control of the insertion device (ID), front end, beam transportation channel and all interlock systems of the beamline: it will supply a highly standardized environment of apparatus control for collaborative researchers. In particular, ID operation is very important in a third-generation synchrotron light source facility. It is also...

The introduction of hard timing constraints to the semantics of a computation presents a set of design challenges that are signi cantly di erent from those of conventional systems, requiring the ability to guarantee that timing constraints are met. Such systems must consider the worst case, rather than the average case, behavior of the system and application software. The Spring system uses a s...

The Spring1 system does not provide persistent object identifiers and not all Spring objects are persistent. Instead, we rely on a general name service and persistent name-to-object bindings to support persistence. The name service is separate from the various subsystems that implement persistent objects, so that new object types can be added, and the implementation of existing types can be cha...

in the current study, the effects of interactions of the moving loads and the attached mass-spring-damper systems of the composite plates on the resulting dynamic responses are investigated comprehensively, for the first time, using the classical plate theory. the solution of the coupled governing system of equations is accomplished through tracing the spatial variations using a navier-type sol...

The karstic Rijab Spring with an average discharge of 3290 l/s is located in the Alvand River basin in the northwest of the Zagros, Iran, which drains Asmari formation. To investigate groundwater flow in the catchment area of the Spring, the physicochemical parameters include major cations and anions, discharge, EC, pH, and temperature were studied from September 2000-2002. The results indicate...