Wesley W. Chu

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A model is developed for allocating information files required in common by several computers. The model considers storage cost, transmission cost, file lengths, and request rates, as well as updating rates of files, the maximum allowable expected access times to files at each computer, and the storage capacity of each computer. The criterion of optimality(More)
In retrieving medical free text, users are often interested in answers relevant to certain scenarios, scenarios that correspond to common tasks in medical practice, e.g., "treatment" or "diagnosis" of a disease. Consequently, the queries they pose are often scenario-specific, e.g., "lung cancer, treatment." A fundamental challenge in handling such queries(More)
As XML [5] is emerging as <i>the</i> data format of the internet era, there is an substantial increase of the amount of data in XML format. To better describe such XML data structures and constraints, several XML schema languages have been proposed. In this paper, we present a comparative analysis of six noteworthy XML schema languages.
Social influence plays an important role in product marketing. However, it has rarely been considered in traditional recommender systems. In this paper we present a new paradigm of recommender systems which can utilize information in social networks, including user preferences, an item's general acceptance, and influence from social friends. A probabilistic(More)
A new generation of information systems that integrates knowledge base technology with database systems is presented for providing cooperative (approximate, conceptual, and associative) query answering. Based on the database schema and application characteristics, data are organized into Type Abstraction Hierarchies (TAHs). The higher levels of the(More)
of the Dissertation Roam: A Scalable Replication System for Mobile and Distributed Computing by David Howard Ratner Doctor of Philosophy in Computer Science University of California, Los Angeles, 1998 Professor Gerald J. Popek, Co-chair Professor W. W. Chu, Co-chair Mobile computing is rapidly becoming a way of life. Users carry their laptops, PDAs, and(More)
A knowledge-based approach to retrieve medical images by feature and content with spatial and temporal constructs is developed. Selected objects of interest in a medical image (e.g. x-ray, MR image) are segmented, and contours are generated from these objects. Features (e.g. shape, size, texture) and content (e.g. spatial relationships among objects) are(More)