A statistical database (SDB) is a database that contains sensitive records describing individuals but only statistical information is available. There are many inference control methods proposed to protect SDBs. In this article, we will briefly introduce three general approaches: conception, perturbation, and query restriction approaches. In addition, six criteria are also introduced to evaluat...

We consider the problem of surviving information warfare attacks on databases. We adopt a fault tolerance approach to the different phases of an attack. To maintain precise information about the attack, we mark data to reflect the severity of detected damage as well as the degree to which the damaged data has been repaired. In the case of partially repaired data, integrity constraints might be ...

Data integrity policies often require that quality and integrity metadata be generated and communicated to potential users. However, in data warehouses, federations, and other multi-tier databases, administrators at different tiers use different schemas. Data at the upper tier is derived from the lower, so we consider the upper tier’s tables to be views, derived by SQL-like expressions. Unfortu...

Information stored in databases is usually incomplete. Typical sources of partiality are missing information, conflicts that occur when databases are merged, and asking queries against several databases simultaneously. The field of partial information in databases has not received the attention that it deserves. Most work on partial information in databases asks which operations of standard lan...

Multinational business expansion and competition have escalated in the recent years, particularly in Eastern Europe and the third world. Tremendous opportunities, therefore, have been created for many companies and formidable hindrances have been amassed against others. Business failure rates among these multinational enterprises have alarmingly increased beyond expectation. So has their IT imp...

In this paper a new model and architecture for information retrieval in a widely distributed hetero-genous multimedia document collection is described. The model generalizes existing probabilistic models for non-distributed information retrieval. The architecture is a conceptual realization of this model. It is hierarchically built in order to provide extendability and scalability and designed ...

n C a i t e Numa era em que a informação é cada vez mais importante, importa desenvolver estratégicas organizadas e sistemáticas de recolha e processamento de informação. Se isso é relevante em quase todos os setores de atividade, torna-se crucial na área da Saúde, particularmente em estruturas hospitalares responsáveis pelo tratamento de doentes graves ou críticos, como são as unidades coronár...

The massive development of biodiversity related information systems over the WWW (World Wide Web) has created much excitement in recent years. These arrays of new data sources are counterbalanced by the difficulty in knowing their location and nature. However, biologists and computer scientists have started to pull together in a rising tide of coherence and organization to address this issue. T...

Developments within bioinformatics and software for data exchange in the life sciences raise important new questions for social informatics. In this paper, I analyse the role of property rights in information in directing these technological developments in the direction of certain social values. In particular, I focus on initiatives for networking distributed databases, operating both on a glo...

Information System (IS) planning is one of the most significant activities for IS acquisition in a large organization. The paper presents the planning of IS integration plan of Health Department in database aspects. The main objective of this IS integration is to specify techniques to link all databases in Health Department so that information is interchanged among them seamlessly. The plan was...