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Chan, H.C.; Goldstein, R.C.: User-database interaction at the knowledge level of abstraction (1997)
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- Abstract
- Proposes and develops a new level of user-database interaction, the knowledge-level interface, where the user and the database system exchange only knowledge from the user. Under the new KL approach, the database system is no longer seen as a store of data. It is an agent to hold domain knowledge and provide it upon request
- Date
- 22. 1.1999 19:06:09
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Chan, H.C.; Wei, K.K.: User query performance with database feedback (1999)
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Chan, H.C.; Tan, B.C.Y.; Wei, K.L.: Three important determinants of user performance for database retrieval (1999)
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Chan, H.C.; Teo, H.H.; Zeng, X.H.: ¬An evaluation of novice end-user computing performance : data modeling, query writing, and comprehension (2005)
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- Abstract
- End-user computing has become a weIl-established aspect of enterprise database systems today. End-user computing performance depends an the user-database interface, in which the data model and query language are major components. We examined three prominent data models-the relational model, the Extended-EntityRelationship (EIER) model, and the Object-Oriented (00) model-and their query languages in a rigorous and systematic experiment to evaluate their effects an novice end-user computing performance in the context of database design and data manipulation. In addition, relationships among the performances for different tasks (modeling, query writing, query comprehension) were postulated with the use of a cognitive model for the query process, and are tested in the experiment. Structural Equation Modeling (SEM) techniques were used to examine the multiple causal relationships simultaneously. The findings indicate that the EER and 00 models overwhelmingly outperformed the relational model in terms of accuracy for both database design and data manipulation. The associations between tasks suggest that data modeling techniques would enhance query writing correctness, and query writing ability would contribute to query comprehension. This study provides a better and thorough understanding of the inter-relationships among these data modeling and task factors. Our findings have significant implications for novice end-user training and development.
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Chan, H.C.; Wei, K.K.; Siau, K.L.: ¬An empirical study on end-users' update performance for different abstraction levels (1994)
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- Abstract
- A major database task is update, for which performance has not been measured. With the widespread availability of databases, updates will be done frequently by end users. The task is gaining in importance as a measure of the usabiblity of a database system. An experiment was conducted to measure the effect of different abstraction levels on user performance for updates. A conceptual level group used the entity relationship model with an entity relationship query language KQL, while a logical level group used the relational model with the standard relational language SQL. Performance was primarily measured by the accuracy of the update query. Secondary measures of time and confidence were also taken
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Chan, H.C.: Naturalness of graphical queries based on the entity relationship model (1995)
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- Source
- Journal of database management. 6(1995) no.3, S.3-13
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Chan, H.C.; Kim, H.-W.; Tan, W.C.: Information systems citation patterns from International Conference on Information Systems articles (2006)
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- Date
- 3. 1.2007 17:22:03
