Bibster is a semantics-based Peer-to-Peer system for exchanging bibliographic data among researchers. Bibster exploits ontologies in data storage, query formulation, query routing and answer presentation. While the original Bibster system assumed a globally shared domain ontology, we here describe extensions to the Bibster system, that allow to learn personalized ontologies from the local bibli...

We present the description and results of our participation in the Clinical Decision Support track at TREC 2015. In this task, our goal was to use clinical narratives to retrieve biomedical articles. We compared the performance of pseudo relevance feedback, query expansion based on UMLS synonyms, and query expansion with personalized PageRank. In addition, we investigated the impact of differen...

Schema queries can play an important role while retrieving information from multiple sources, for example, in query formulation and in query optimization. We identify four classes of schema queries that we have found useful while designing an application programming interface for frame representation systems (FRSs): taxonomic, frame structure, constraint and class comparison queries. We propose...

This study is part of our ongoing research on the field of conceptual query expansion, currently focusing on a user-centred approach relating to whether non-expert users could directly interact with various types of KOSs. In previous phases, we studied the initial query formulation for given information seeking tasks. We mapped, both lexically and semantically, the terms used to formulate a que...

the present article begins with an articulation of the significance and relation of ‘query and response’ with both dialogue and its semantic perimeters and discloses the sources of rumi’s thinking about this issue. after this taking a comparative stance, this article briefly explores the background and the significance of query and response, dialogue and dialectic as they relate to both ontolog...

This article compares search effectiveness when using query-based Internet search (via the Google search engine), directory-based search (via Yahoo) and phrase-based query reformulation assisted search (via the Hyperindex browser) by means of a controlled, userbased experimental study. The focus was to evaluate aspects of the search process. Cognitive load was measured using a secondary digit-m...

In this paper, we explore the effects of objective task difficulty and domain knowledge on users’ query formulation behaviors. The dataset from a user experiment was used in this research, which focused on the medical domain. The objective difficulty was measured by the precision level of search topics (as queries) in the search system, and searchers’ domain knowledge was assessed by a self-rep...

The accurate formulation of boolean expressions is a notorious problem in programming languages and database query tools. This paper studies the ways that untrained users naturally express and interpret queries, revealing some of the underlying reasons why this task is so difficult. Among the study's findings are: people interpret the word AND to mean either conjunction or disjunction depending...

An important application of semantic technologies in industry has been the formalisation of information models using OWL 2 ontologies and the use of RDF for storing and exchanging application data. Moreover, legacy data can be virtualised as RDF using ontologies following the ontology-based data access (OBDA) approach. In all these applications, it is important to provide domain experts with qu...

OBJECTIVES To develop mechanisms to formulate queries over the semantic representation of cancer-related data services available through the cancer Biomedical Informatics Grid (caBIG). DESIGN The semCDI query formulation uses a view of caBIG semantic concepts, metadata, and data as an ontology, and defines a methodology to specify queries using the SPARQL query language, extended with Horn ru...