A generalized bitemporal relational data model (BTNM) is formalized for the representation of bitemporal data with nested structure of arbitrary depth. Time is represented by temporal elements. Time-varying attributes are timestamped by taking advantage of the nested feature of the model. Thus, the temporal dimension of the model is expressed by bitemporal nested attributes consisting of atomic...

An integrable quantum group deformation of the supersymmetric t-J model is introduced. Open boundary conditions lead to an spl q (2; 1) invariant hamiltonian. A general procedure to obtain such invariant models is proposed. To solve the model a generalized nested algebraic Bethe ansatz is constructed and the Bethe ansatz equations are obtained. The quantum supergroup structure of the model is i...

In this paper we approach the construction of the both upper and lower tolerance limit in a two-way nested model with mixed effects in balanced data. In order to do so we proceed as Fonseca et al [1] did in order to derive the upper tolerance limit in a two-way nested model with mixed effects in unbalanced data, by using the generalized confidence interval idea earlier used by Krishnamoorthy an...

Empirical factor demand analysis typically involves making a choice from among several competing non-nested functional forms. Each of the commonly used factor demand systems, such as Translog, Generalized Leontief, Quadratic, and Generalized McFadden, can provide a valid and useful empirical description of the underlying production structure of the firm. As there is no theoretical guidance on s...

This thesis reports on the results of a study of the nested join operator in a mediator-based setting. As the rate at which data is accumulated increases, the need for integration of di erent (physical) Database Management Systems (DBMS) becomes apparent. The most fundamental and arguably important operation that is used in order to achieve this is the join-operator. The nested-relational model...

one of the really important challenges facing agricultural producers is the choice of their product distribution channels. the present study is aimed at investigating the citrus marketing channel strategy and its determinants among citrus orchardists of mazandaran using a nested logit model. some two hundred and fifty two orchardists from 15 cities of mazandaran were taken as the study samples....