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Database systems can be difficult to use. Part of the problem is that systems do not, for the most part, help a user when a query fails or fails to evaluate as the user expects. Schema and semantics of databases are often complex, and are rarely understood in entirety by the lay user. As a consequence, queries a lay user casts may not make sense with respect to a database's semantics. A system which...
The ability to deal with spatial data is becoming increasingly important in applications in geographic information systems, computer vision, computer graphics, computer vision, image processing, solid modeling, robotics, and cartography. This manifests itself in the need to incorporate this data in existing database management systems. This incorporation must result in the coexistence of the...
A growing number of applications require time-constrained access to data. For these applications, the timeliness of the data is part of the correctness criteria. Timing constraints can be derived from the temporal consistency requirements of the application and must be enforced by the DBMS. Examples of applications that require the processing of varying quantities of data with timing constraints range...
The recent advances in hardware and enabling software technologies are having profound effect on the development of UI tools for building database applications. In this tutorial, we will first give a historical account of the evolution of DB UI tools since the early seventies in terms of database models, database languages, database development tools (Visual 4GL), and end user graphical tools...
The function of air traffic flow management (ATFM) is to ensure that air traffic operates within adequate margins of safety. Existing ATFM systems are manual which are over-conservative in. operation resulting in under-utilisation of available airspace. As well as being costly, such systems are unable to cope with increased demand for air travel in regions such as Europe. Attempts are currently being...
The complexity of industrial artifacts such as power plants, aircrafts etc., is continuously growing. Typically for such advanced products is that they are hybrids of various technologies and contain several types of engineering models that are related in a complex fashion. For power plant design, there are functional models, mechanical models, electrical models etc. A product modeling system...
The emphasis in object-oriented databases (OODBs) is on the inheritance, or “is a,” type of relationship; yet, many relationships within databases are of the aggregate type—e.g., “is a part of” and “is associated with.” While the semantics of the inheritance relationship is directly supported by OODB systems, the semantics of aggregate relationships must often be implemented again and again by application...
Modeling the activities of an application domain is a necessary extension of modeling the structure and behavior of objects in the domain. Object models capture the structure and behavior of components in the application domains, whereas activity models are used to describe the functionality of the domain. The integration of object and activity modeling is essential for producing complete domain models...
Images are becoming an important asset and managing them for efficient retrieval poses challenges to the database community. In this paper, we proposed a novel three-tier color index that supports efficient image retrieval by color contents which is important to certain applications, especially when shapes and semantic objects cannot be easily recognized. A prototype painting database system is designed...
To ensure the uniqueness of all trademarks registered is very important. With ever increasing number of registered trademarks, this is becoming increasingly difficult. A system for search and registration of trademarks is presented in this paper. Trademarks are complex patterns consisting of various image and text patterns, called devicemark and word-in-mark respectively. Traditionally, only text...
A programmer attempting to understand and debug a distributed program deals with large volumes of trace data that describe the program's behaviour. Visualization is widely believed to help in this and similar tasks. We contend that visualization is indeed useful, but only if accompanied of powerful data management facilities to support abstraction and filtering. The Hy+ visualization system...
This paper presents new style maps, called dynamic maps, based on view functions of geographic databases. The dynamic maps contain two basic components, (1) queries applied to geographic databases and (2) visualization methods for data derived by the queries. There are three major factors to change the content of dynamic maps, (1) data (unlike conventional geographic systems, we assume that up-to-date...
This paper describes the design and implementation of the limits database for the environmental information system of Baden-Württemberg. Environmental legislation in Germany is based on numerous laws, decrees, and other regulations. Regulations of the European Union (EU) have a growing impact. Not surprisingly, terminology differs substantially among different regulations. Even for experts, it is...
Intelligence in database systems is the capability of modeling both the complex structure of data and its dynamic evolution. The Chimera intelligent database prototype, designed in the context of the IDEA Esprit project, provides an object-oriented data model, deductive rules to express computations, and production rules to implement active reactions to database events. We present in this paper a...
Conventional database systems lack temporal, object and rule support to model financial database applications. In [CS93a], we described the complexity of financial applications and studied the database requirements of such applications. We argued that next-generation databases are an appropriate platform for developing database applications. In this paper we build upon this research by studying strategies...
We have built a multidatabase system to support a financial application that provides access to real-time and historical financial data concerning stocks, bonds, options and mutual funds. The arrival rate of data is 500 items per second, each of which may be saved in a DBMS. Sub-second response time is required for queries. The consistency and performance of real-time data differs from those...
Scientific and engineering database applications put new requirements on database management systems that is usually not associated with traditional administrative database applications. These new database applications include finite element analysis (FEA) for computational mechanics and usually have a high level of complexity of both data and algorithms, as well as high volume of data and high requirements...
We describe solutions to practical database problems encountered during the implementation of a prototype Physician's Workstation (PWS) at Hewlett-Packard Laboratories: (i) the integration of legacy data repositories using an object-oriented database management system; and (ii) the development of a clinical information model which logically encapsulates potentially heterogeneous underlying data sources,...
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