چکیده:
Expansion and reformulation of queries are among the most common strategies employed by users in retrieval of initial results to coordinate them with their needs. The present study examines the expansion and reformulation of queries and their impact on improving the precisionof the retrieval results.The analytical survey method was used to evaluate the relationship between the variables. The study was conducted on the MA students of the Information Science and Knowledgein Islamic Azad University of Ahvaz, Khuzestan Science and Research Branch, who had the seminar course(n=28). The data were collected using a researcher-made questionnaire. The results showed the lack of enough time to review all the retrieved results as the most important reason for the expansion and reformulation of queries (mean = 4.66). In addition, the users reported different perceived usefulness of the expansion and reformulation tools for the retrieval results where they perceived the reformulation strategy more useful (mean =3.781). Furthermore, the precision of the initial results was significantly increased using the reformulation tools. The tools including limiting the search terms by the resource title, subject, year, and searching the initial results enhance the overall precision of the initial results. However, for the expansion tools, using these limiting approaches resulted in no significant difference between the precision of initial results and the final retrieval results. The results show that using the expansion and reformulation tools to correct the initial search may have different reasons. Moreover, the use of these tools affects the precision of searches.
خلاصه ماشینی:
com Abstract Expansion and reformulation of queries are among the most common strategies employed by users in retrieval of initial results to coordinate them with their needs.
In addition, the users reported different perceived usefulness of the expansion and reformulation tools for the retrieval results where they perceived the reformulation strategy more useful (mean =3.
The expansion and reformulation stages indicate the correction of initial query formulation manually or systematically (Huang and Efthimiadis, 2009; Mastora, Monopoli and Kapidakis, 2008) to improve information retrieval performance (Joshi and Doshi, 2013).
Therefore, this study aimed to investigate the usefulness of expansion and reformulation tools and their effect in improving the precision of initial retrieved results.
Search expansion strategy can increase the precision (Fonseca, Golgher, Possas, Riberio-Neto and Ziviani, 2005; Lin, Wang and Chen, 2006; and Lioma and Ounis, 2008) and the relatedness in retrieved results in search engines (Fattahi, 2006).
H1: Users' perceived usefulness of results retrieved following the expansion and reformulation tools shows a significant difference.
Hypothesis 1: Users' perceived usefulness of results retrieved following the expansion and reformulation tools shows a significant difference.
Hypothesis 2: A significant difference exists between the precision of initial results and the precision of the retrieved results following query expansion and reformulation tools.
It is claimed that the perceived usefulness by users of retrieved results showed a significant difference during the use of the query expansion and reformulation tools (Table 4).
No previous studies have indicatedthe perceived usefulness of users of results retrieved during the use of query expansion and reformulation.