In this paper, we propose a novel query language for video indexing and retrieval that (1) enables to make queries both at the image level and at the semantic level (2) enables the users to define their own scenarios based on semantic events and (3) retrieves videos with both exact matching and similarity matching. For a query language, four main issues must be addressed: data modeling, query f...

In recent years, several attempts have been made to define query languages characterized by both high expressive power and easy query formulation. Several issues concern graphical applications, based on the diagrammatic representation of a semantic model and visual interaction. This paper describes the architecture and the implementation of a graphical query system, based on the diagrammatic re...

Recent research showed the benefits of adopting formal ontologies as a means for accessing heterogeneous data sources. The use of an ontology not only provides a uniform and flexible approach for integrating and describing these sources, but it can be used to improve the usability of an integrated system by guiding the final user to formulate his/her information needs. More precisely, the task ...

An increasing number of conceptual modelling techniques use verbalisation of sample data to derive a model for the given universe of discourse (the problem domain). The underlying assumption is that by elaborate verbalisation of samples taken from the universe of discourse one can elicit an overview of the concepts relevant for the universe of discourse and their interrelationships. In each of ...

Being able to formulate useful SQL queries is a fundamental skill required by many software development professionals. Masteringthis skill is a difficultprocess, requiringconsiderable practice and effort on the part of the student. In addition, assessment of SQL query formulation skills is a process that does not appear to have been thoroughly researched, and numerous problems are inherent to t...

Unity is an architecture for integrating relational databases that performs three processes: metadata capture, semantic integration, and query formulation and execution. The foundation of the architecture is a naming methodology that allows concepts to be integrated across systems. Semantic naming of schema constructs increases automation during integration and provides users with physical and ...

ion & Reformulation • Original formulation • Reformulated formulation Original problem Reformulated problem Reformulation technique The reformulation may be an approximation • Original query • Reformulated query Original space Reformulated space Φ(S l ti (P )) Solutions(Pr) o u ons o Solutions(Po) Constraint Systems Laboratory 10/1/2007 4 CP 2007 Issue: finding Ken’s house Google Maps Yahoo Maps

It is difficult for users to formulate appropriate queries for search. In this paper, we propose an approach to query term selection by measuring the effectiveness of a query term in IR systems based on its linguistic and statistical properties in document collections. Two query formulation algorithms are presented for improving IR performance. Experiments on NTCIR-4 and NTCIR-5 ad-hoc IR tasks...

Databases are continuously evolving environments, where design constructs are added, removed or updated rather often. Research has extensively dealt with the problem of database evolution. Nevertheless, problems arise with existing queries and applications, mainly due to the fact that, in most cases, their role as integral parts of the environment is not given the proper attention. Furthermore,...

This paper elaborates on ontology-based end-user visual query formulation, particularly for users who otherwise cannot/do not desire to use formal textual query languages to retrieve data due to the lack of technical knowledge and skills. Then, it provides a set of quality attributes and features, primarily elicited via a series of industrial enduser workshops and user studies carried out in th...