Chew-Hung Chang

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Integrated with G-Portal, a Web-based geospatial digital library of geography resources, this paper describes the implementation of <i>Mobile</i> G-Portal, a group of mobile devices as learning assistant tools supporting collaborative sharing and learning for geography fieldwork. Based on a modified Technology Acceptance Model and a Task-Technology Fit(More)
In the age of Web 2.0, users are increasingly familar with social tagging or bookmarking where comments and ratings are added by users to objects on the web for public consumption. Such comments and ratings are represented in bookmarks which can be used for information or opinion sharing, user interest discovery, and content recommendation. In this paper,(More)
In this paper, we address the problem of integrating Wikipedia, an online encyclopedia, and G-Portal, a web-based digital library, in the geography domain. The integration facilitates the sharing of data and services between the two web applications that are of great value in learning. We first present an overall system architecture for supporting such an(More)
This paper describes G-Portal, a geospatial digital library of geographical assets, providing an interactive platform to engage students in active manipulation and analysis of information resources and collaborative learning activities. Using a G-Portal application in which students conducted a field study of an environmental problem of beach erosion and(More)
The personalized project space is an important feature in G-Portal that supports individual and group learning activities. Within such a space, its owner can create, delete, and organize metadata referencing learning objects on the Web. Browsing and querying are among the functions provided to access the metadata. In addition, new schemas can be added to(More)
We introduce MobiTOP, a map-based interface for accessing hierarchically organized georeferenced annotations. Each annotation contains multimedia content associated with a location, and users are able to annotate existing annotations, in effect creating a hierarchy. MobiTOP's interface was designed using a participatory design methodology to ensure that the(More)
—We introduce MobiTOP (Mobile Tagging of Objects and People), a map-based application which allows users to contribute and share geo-referenced multimedia annotations via mobile devices. An important feature of MobiTOP is that annotations are hierarchical, allowing annotations to be annotated to an arbitrary depth. MobiTOP's interface was designed using a(More)
1. EXTENDED ABSTRACT Social bookmarking is a simple yet popular way for users to share information and opinions about bookmarked objects on Web. In the digital library context, the ability to bookmark digital content objects is a powerful means for library users to learn from one another and to collaborate. In this paper, we present a common database(More)
In this paper, we study the problem of maintaining metadata for open Web content. In digital libraries such as DLESE, NSDL and G-Portal, metadata records are created for some good quality Web content objects so as to make them more accessible. These Web objects are dynamic making it necessary to update their metadata records. As Web metadata maintenance(More)