Schema evolution is an important research topic with an extensive literature built up over the years. However, databases are still reluctant to change and thus their evolution is difficult to achieve because the evolution of the schema involves several issues at different levels of the database schema such as the change management at the logical level. Several approaches have been proposed to a...

Analyzing evolution characteristics of landscape ecological risk patterns would help establish ecological risk early warning mechanism, reduce the ecological risk probability and promote coastal landscape pattern optimization. In this study, landscape pattern indices were first calculated by using multitemporal Landsat TM images acquired in years 1990, 2000 and 2010, then landscape ecological r...

Michael Phelan University College Dublin Centre for Telecommunications ValueChain-Driven Research, Room D102 (A), Building D, Michael Smurfit School of Business, University College Dublin, Carysfort Avenue, Blackrock, Co. Dublin, Ireland Tel: + 353 1 716 4355 [email protected] Seán McGarraghy University College Dublin Management Information Systems Quinn School of Business University Colleg...

Dynamic schema evolution is the ability of the database schema to evolve by incorporating changes to its structure without loss of existing data and without significantly affecting the dayto-day operations of the database. A very large body of literature exists today reflecting the extensive work addressing schema evolution and its management. Schema evolution has three well-defined and inter-r...

The schema of a system consists of the constructs that model its entities. Schema evolution is the timely change and management of the schema. Dynamic schema evolution is the management of schema changes while the system is in operation. We propose a sound and complete axiomatic model for dynamic schema evolution in objectbase management systems (OBMSs) that support subtyping and property inher...

Background: To analyze the evolution of semen parameters in leucospermic men explored for a couple's infertility according to the therapeutic management of leucocytospermia. The potential benefits of leucocytospermia treatment on the natural pregnancy outcomes are also examined. Materials and Methods: Our study was carried out in 100 leucospermic male parteners of infertile couples. Leucoc...

Ontology evolution is increasingly gaining momentum in the area of Semantic Web research. Current approaches target the evolution in terms of either content, or change management, without covering both aspects in the same framework. Moreover, they are slowed down as they heavily rely on user input. We tackle the aforementioned issues by proposing Evolva, a comprehensive ontology evolution frame...

background: with regard to novel plans in the health sector, including “health sector evolution” and changes of hospitals’ issues, change and innovation skills are considered essential for hospital administrators. this study aimed to determine the relationship between management style and change and innovation skills of administrators in teaching hospitals of shiraz university of medical scienc...

this study presents a detailed analysis of cost management for intensive cultivation activity in terms of tomato production. the main objective was to provide qualitative and quantitative costs obtained in the intensive cultivation of tomato. this methodology was structured by activity costs (soil preparation and planting, crop monitoring, harvesting, selling, etc.) through a study in greenhous...