We confront the promises of active database systems with the result of their use by application developers. The main problems encountered are iusufficient methodological support in analysis and design, the lack of standardization, missing development and administration tools for triggers, and weak performance. We concentrate on performance because we discovered it is one the maiu reasons that m...

In this paper, we describe a retrieval system that uses hidden annotation to improve the performance. The contribution of this paper is a novel active learning framework that can improve the annotation efficiency. For each object in the database, we maintain a list of probabilities, each indicating the probability of this object having one of the attributes. This list of probabilities serves as...

The ThYme (Thioester-active enzYme; http://www.enzyme.cbirc.iastate.edu) database has been constructed to bring together amino acid sequences and 3D (tertiary) structures of all the enzymes constituting the fatty acid synthesis and polyketide synthesis cycles. These enzymes are active on thioester-containing substrates, specifically those that are parts of the acyl-CoA synthase, acyl-CoA carbox...

Annotating a video-database requires an intensive human effort that is time consuming and error prone. However this task is mandatory to bridge the gap between low-level video features and the semantic content. We propose a partition sampling active learning method to minimize human effort in labeling. Formally, active learning is a process where new unlabeled samples are iteratively selected a...

The heterogeneous environment is emerging in the current information systems. Within this situation, it is desirable to maintain consistency across databases, i.e., to ensure that they do not contradict each other with respect to the existence or value of real-world entity. Active rules have been widely used in the modern database systems. Active databases contain the capability to automatic mo...

In many intelligence and security tasks it is necessary to monitor data in database in order to detect certain events or changes. Currently, database systems offer triggers to provide active capabilities. Most triggers, however, are based on the Event-Condition-Action paradigm, which can express only very primitive events. In this paper we propose an extension of traditional triggers in which t...

Metrics are useful mechanisms for improving the quality of soji`vvare products and also for determim.ng the best ways ro help practitioners and researchers. UnfortunateLy, almost all the metrics put forward focus on program characteristz`cs disregardz.ng databases. However, databases are becomz`ng more compLex, and it is necessary to measure schemata complexity in order to understand, monz.tor,...

This paper describes the active, object-oriented database system SAMOS being developed as a research prototype. Its main approach is the integration of rules in the sense of active database systems into a general object-oriented data model. Our effort is also focussed on integrating the rule system with transaction processing in a meaningful way.

Whenever technologies converge there exists the potential for huge benefits but also the risk of failure. The main pitfall when combining technologies that evolved independently consists in attempting to provide the union of features without properly considering the often incompatible assumptions and the crosseffects. In this paper real-time databases, active databases, and distributed object s...