Allocation of data or fragments in distributed database is a critical design issue and requires the most effort. It has the greater impact on the quality of the final solution and hence the operational efficiency of the system. Performance of the distributed database system is heavily dependent on allocation of data among the different sites over the network. The static allocation provides only...

Improving the efficiency of public transport systems is a critical problem. In order to help implement strategies for improving efficiency, public transport managers and researchers need access to an upto-date information system that fully describes these strategies including data on their quantitative benefits. This research outlines a proposal for developing such a database and how it might b...

A polymorphic approach to the incremental design and reuse of object-oriented methods and query speciications is presented. Using this approach, the eeort required for manually reprogramming methods and queries due to schema modiications can be avoided or minimized. The salient features of our approach are the use of propagation patterns and a mechanism for propagation pattern reenement. Propag...

Managing scientiic data is a challenging task, and many of the problems it presents have yet to be adequately solved. The Real-time Environmental Information Network and Analysis System (REINAS) is an attempt to develop an operational solution to the problem of collecting and distributing environmental data in a real-time context, as well as supporting data acquisition, veriication, retrieval, ...

The Advanced Photon Source is now in its fifth year of routine beam production. The EPICS-based [1] control system has entered the phase in its life cycle where new control algorithms must be implemented under increasingly stringent operational and reliability requirements. The sheer volume of the control system (~270,000 records, ~145 VME-based input-output controllers (IOCs), and ~7,000,000 l...

In 2014, the National Health Insurance Service (NHIS) signed a memorandum of understanding with the Korean Diabetes Association to provide limited open access to its databases for investigating the past and current status of diabetes and its management. NHIS databases include the entire Korean population; therefore, it can be used as a population-based nationwide study for various diseases, inc...

Data warehousing is an essential element of decision support systems, which have become the largest growing segment of the database industry. Many products and services are now available, and all of the leading database vendors now have commercial offerings in these technologies. Very large (multiterabyte) data warehouses are being built and successfully deployed in the telecommunications, fina...

Classijication is an important task in data mining. Encapsulating classijication in an object-oriented database system requires additional features: we propose multiobjects and schema evolution. Our approach allows us to store classification functions, and to store instances of each group in order to retrieve them later: Since the database is operational, it allows us also to perform dynamic cl...

The PPL framework is proposed as a simple extension to logic programming aiming at handling resources. It is argued that the separation between logical treatments and resource handling is desirable and, to that end, resources are proposed to be manipulated by means of pre-and post-conditions associated with usual Horn clauses. The expressiveness of the resulting framework is evidenced through t...

To interact in a virtual environment, an agent must be aware of its available actions and the objects that can participate in these actions. Work such as Kallmann’s SmartObjects allows for this information to be encoded by a simulation author, but these encodings tend to be constrained to individual graphical models. Furthermore, there may not be agreement on the proper operational information ...