The problem of impedance mismatch between applications written in OO languages and relational DB is not a problem of discrepancy between object-oriented and relational approaches themselves. Its real causes can be found in usual implementation of the ОО approach. Direct comparison of the two approaches cannot be used as a base for the conclusion that they are discrepant or mismatched. Experimen...

Reuse of domain models is often limited to the reuse of the structural aspects of the domain (e.g. by means of generic data models). In object-oriented models, reuse of dynamic aspects is achieved by reusing the methods of domain classes. Because in the object-oriented approach any behavior is attached to a class, it is impossible to reuse behavior without at the same time reusing the class. In...

Managing and querying information with varying temporal granularities is an important problem in databases. Although there is a substantial body of work on temporal granularities for the relational data model [11], a comprehensive framework is lacking for the object-oriented paradigm. To the best of our knowledge, a formal treatment of temporal queries with multiple granularities has not been c...

Recently, quantile regression (QR) models are often applied for longitudinal data analysis. When the distribution of responses seems to be skew and asymmetric due to outliers and heavy-tails, QR models may work suitably. In this paper, a semi-parametric quantile regression model is developed for analysing continuous longitudinal responses. The error term's distribution is assumed to be Asymmetr...

this qualitative study has been done with the final objective of exploring the in-crisis firms’ turnaround process, using a systematic plan of grounded theory. so, open 10 interviews were conducted exclusively with managers of listed (accepted) companies’ in tehran stock exchange experiencing financial crisis during 2006-2012 and they have been successful in turnaround. the results of analysis ...

Searching for a hidden target is an important algorithmic paradigm with numerous applications. We introduce and study the general setting in which a number of targets, each with a certain weight, are hidden in a star-like environment that consists of m infinite, concurrent rays, with a common origin. A mobile searcher, initially located at the origin, explores this environment in order to locat...