In addition to this discouraging result, the increase of search pattern size or complexity had an even more profound effect on query completion, from exceeding the completion time limit to SPARQL query engine-triggered query termination due to the query computational load exceeding any reasonable expectations, of 11 years, for example (results not shown).
Figure 4 SPARQL query completion and average molecular size in DB100.
Our results indicate that the constrained interfaces outperform the freehand sketch-based interface, in terms of both search accuracy and query completion time.
Generally, SPARQL query completion exhibits a dramatic drop across all test cases with increasing number of atoms in the database molecules searched at a given time (Figure 4).
Although large collections of chemical data have recently become represented in RDF and exposed to SPARQL querying [11 13], seamless and facile integration of computational resource output to enable query completion has been difficult to attain with currently existing technologies.
After completion of the query, the URL to the index of resulting output images is e-mailed to the user along with the job summary.
In the future, this step will be replaced by combined visual and textual retrieval, which will further improve query completion and system quality in general.
Several studies have shown that combining CBIR with natural language processing (NLP) of medical unstructured text (e.g., anamnesis, diagnosis) associated with the images and hosted in the EMR may significantly improve query completion [ 80, 81].
The online data entry system minimizes the delays in data queries, completion of forms and problem resolution; it makes the dataset quickly available and permits continuous assessment of data quality.
Overall, the completion time of this query for DB10000 is well within the stipulated time limit for all the queries attempted (results not shown).
