In this paper we analyse access traces to a Web proxy, looking at statistical parameters to be used in the design of a replacement policy for documents held in the cache. In the rst part of the paper we present a number of properties of the lifetime and statistics of access to documents, derived from two large trace sets coming from very diierent proxies and spanning over time intervals of up t...

In this paper we derive the sharp long time stability and error estimates of nite element approximations for parabolic integro di erential equations First the exponential decay of the solution as t is studied and then the semi discrete and fully discrete approximations are considered using the Ritz Volterra projection Other related problems are studied as well The main feature of our analysis i...

High latency network and large data sets produced by the applications in data grid environment can put heavy burden on network resources and cause applications to take longer times to finish. Data caching is one of the methodologies which can improve the efficiency of data usages in the distributed environment by storing popular data on the places closed to the clients. It is quite obvious that...

Modeling short and long time dependence in univariate time series may be successfully accomplished through existing time series processes. In the multivariate setting just a few complex models exist to take care of the di®erent marginal dynamics as well as of the dynamic covariance matrix. The copula approach factors the joint distribution into the marginals and a dependence function, its copul...

Advance demand information, when used effectively, improves the performance of production/inventory systems. The extent of improvement however depends on certain factors. We investigate the influence of random supply lead times on a single-stage inventory system with advance demand information. It is found that the supply lead time variability diminishes the benefits of advance demand information.

Strain induced precipitation in HSLA-100 steel was investigated by conducting hotcompression and relaxation tests at temperature range of 850°C to 1100°C and strain rate of 0.001s-1 to 1s-1. The absence of dynamic recrystallization at temperatures below 1000°C was attributedto the influence of dynamic precipitation. The stress relaxation tests showed that strain inducedprecipitation is possible...