An important task of multidatabase systems is the integration of existing databases. Database Integration is achieved primarily through the use of generalization. Hence, it is important to develop good tactics for processing queries over generalization hierarchies. This paper defines the class of conjunctive generalization queries, and it describes four tactics for processing those queries that...

In this paper we describe the difficulties we faced to evaluate performance of heterogeneous cluster so that we get reliable performance analysis of a given cluster or in that matter ”cluster of cluster” system. We also describe the options that we thought for such an analysis. We started with homogeneous machines and tried to develop a model to identify the issues that would arise in a general...

The nonparametric estimation(NE) of kernel polynomial regression (KPR) model is a powerful tool to visually depict the effect of covariates on response variable, when there exist unstructured and heterogeneous data. In this paper we introduce KPR model that is the mixture of nonparametric regression models with bootstrap algorithm, which is considered in a heterogeneous and unstructured framewo...

a)High Energy Accelerator Research Organization (KEK), 1-1 OHO, Tsukuba, Ibaraki 305-0801, Japan b)Tokyo Management College, 625-1 Futamata, Ichikawa, Chiba 272-0001,Japan c)Meiji-Gakuin University, Kamikurata 1518, Totsuka, Yokohama 244-0816, Japan d)Kogakuin University, Nishi-Shinjuku 1-24, Shinjuku, Tokyo 163-8677, Japan e)Seikei University, Musashino, Tokyo 180-8633, Japan f)Rikkyo Universi...

In this paper we investigate the multiplexing of heterogeneous applications and the pricing of transmission services on an ATM network. Pricing is of interest for network management to promote efficient utilization of resources. A framework is presented in which users select from a menu of services, are peak-rate policed, and are charged according to their usage and connection time. We illustra...

To understand in detail duality between heterotic string and F theory compactifications, it is important to understand the construction of holomorphic G bundles over elliptic Calabi-Yau manifolds, for various groups G. In this paper, we develop techniques to describe these bundles, and make several detailed comparisons between the heterotic string and F theory.

Simple mean field methods can be used to describe transitions between different space-time models in string theory. These include transitions between different Calabi-Yau manifolds, and more exotic things such as the Calabi-Yau/Landau-Ginzberg correspondence.