Consistency criteria adopted for the management of persistent replicated objects in a distributed system de ne the degree of concurrency allowed among operations accessing objects Several notions of consistency are known from the literature among them are causal con sistency causal serializability and serializability In this paper we propose a generalizing algorithm for con currency control in ...

This paper examines the work undertaken in the UK Alvey funded project IPSE from the point of view of the approach taken to the development of the core sys tem It outlines the reasoning which led to the decision to base the system on a active process core rather than the more traditional approaches which have tended to support an entity derived model It gives a brief overview of the project wit...

OBJECTIVE In the course of clinical treatment, several medical media are required by a phy-sician in order to provide accurate and complete information about a patient. Medical image registra-tion techniques can provide a richer diagnosis and treatment information to doctors and to provide a comprehensive reference source for the researchers involved in image registration as an optimization pro...

The effect of clouds on the shortwave (SW) irradiance near the surface is of interest for surface radiative energy budget studies (Long et al. 1994) and investigation of the recently suggested excess SW cloud absorption (Cess et al. 1995; Ramanathan et al. 1995; Pilewski and Valero 1995). One measure of the effect of clouds is cloud forcing: the difference between clear (i.e., cloudless) sky ir...

PSP is a methodology for an individual software engineer's continuous self-improvement. Currently, few PSP experience reports are available from non-US sources, and hardly any from people other than the PSP inventor Watts Humphrey. We describe independent experiences with PSP. We nd that PSP is a viable and useful approach and has quantiiable, positive impact. Problems in teaching PSP are in ke...

Given the great demand and promise for educational use of GIS, real time ac­ cess to massive remote geospatial datasets for pedagogical purposes would be immensely useful to educators and students. However, such access has remained elusive. In other work, we have demonstrated that a P2P distributed system of client-side proxies can address the challenges posed by the interactive, multiplicative...

A common method for regulating the input ow in today s telecommunication networks is the implementation of reactive tra c control mechanisms By limiting the user s ac cess according to the current network load situation the throughput is optimized while congestion is avoided In ATM networks for example a rate based feedback control is applied to dynamically adjust the transmission rates of conn...

Let M be a monoid (e. is then a compact abelian group; a linear cellular automaton (LCA) is a continuous endomorphism F : A M ?! A M that commutes with all shift maps. Let be a (possibly nonstationary) probability measure on A M ; we develop suucient conditions on and F so that the sequence fF N g 1 N=1 weak*-converges to the Haar measure on A M , in density (and thus, in Cess aro average as we...

Several current problems in atmospheric radiation over the tropical oceans may have at least partial solutions as effects of diurnal variations of outgoing longwave radiation (OLR). At issue are explanations for the following: a) excessively large amplitudes (in relation to theory) of the diurnal thermal tides over the tropical oceans (Braswell and Lindzen 1998); b) reported observations of exc...