Abstract

 
 
 Recent progress in ubiquitous computing technology is allowing development of new and so- phisticated applications that are now able to store very large data on the mobile device itself, besides access data stored remotely. Thus emerges the need to query and maintain data from portable equipments. However, traditional query languages such as SQL (Structure Query Lan- guage) and QbE (Query by Example) are inadequate for devices with small screens. Hence, this work presents QbZ (Query by Zoom), a query language based on Semantic Zoom for small-screen devices. The proposed mechanism is particularly suitable to locate and access data stored in portable equipments. In order to demonstrate the benefits of using QbZ, usability tests were conducted, as well as a comparative analysis with the existing solutions.
 
 
Highlights
Recent progress in technology used in portable devices is contributing to diminish the cost of these equipments, making them accessible to a growing group of persons
This work introduces QbZ (Query by Zoom), a query language based on Semantic Zoom [13] for smallscreen devices
In this paper we present QbZ (Query by Zoom), a query language based on Semantic Zoom, for portable devices
Summary
Recent progress in technology used in portable devices (such as PDAs, cell phones and smartphones) is contributing to diminish the cost of these equipments, making them accessible to a growing group of persons. With the advancement of technology in both data communication networks and accessing devices, new and sophisticated ubiquitous applications can be developed, the demand for which should follow the growth trend. Examples of these applications are: teaching and collaborative working, electronic tourist guides, navigation and route planning [1]. This article is organized as follows: Section 2 presents the concepts necessary to understanding the proposed language; Section 3 discusses related works; Section 4 introduces the QbZ language; Section 5 presents the results of tests undertaken; Section 6 concludes this work and points out directions for future works
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