Various types of cellular neural networks (CNNs) are summarized, and a taxonomy of CNNs is given according to the different types of grids, processors, interactions, and modes of operation. The CNN universal machine i...
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Various types of cellular neural networks (CNNs) are summarized, and a taxonomy of CNNs is given according to the different types of grids, processors, interactions, and modes of operation. The CNN universal machine is introduced. The architecture and the key features of the CNN universal machine are outlined. An exhaustive list of references is given.< >
For pt.I, see ibid., p.1-10 (1992). The programmability (as a stored program) of the CNN universal machine is discussed. It is shown why and in which sense this machine is universal. The analogic type of algorithm is ...
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For pt.I, see ibid., p.1-10 (1992). The programmability (as a stored program) of the CNN universal machine is discussed. It is shown why and in which sense this machine is universal. The analogic type of algorithm is introduced. The application potential is reviewed and the biological relevance is analyzed. It is shown that the architecture is optimal not only for silicon implementations, but also for many biological information processing organs that have the same structure.< >
Despite rapid growth in workstation and networking technologies, the workstation environment continues to pose challenging problems to shared processing. In this paper, we present a computational model and system for ...
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Despite rapid growth in workstation and networking technologies, the workstation environment continues to pose challenging problems to shared processing. In this paper, we present a computational model and system for the generation of distributed applications in such an environment. The well-known RPC model is modified by a novel concept known as template attachment. A computation consists of a network of sequential procedures which have been encapsulated in templates. A small selection of templates is available from which a distributed application with the desired communication behavior can be rapidly built. The system generates all the required low-level code for correct synchronization, communication, and scheduling. This results in a system that is easy to use and flexible, and can provide a programmer with the desired amount of control in using idle processing power over a network of workstations. The practical feasibility of the model has been demonstrated by implementing it for Unix1-based workstation environments.
Object-oriented database technology is being developed to provide support for advanced applications such as engineering databases, office information systems, and knowledge bases. Successful deployment of these system...
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The issue of executing concurrent transactions reliably in a multidatabase system is addressed. Our formalization assumes the most pessimistic scenario where individual database managers that make up the multidatabase...
Object-oriented database technology is being developed to provide support for advanced applications such as engineering databases, office information systems, and knowledge bases. Successful deployment of these system...
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Object-oriented database technology is being developed to provide support for advanced applications such as engineering databases, office information systems, and knowledge bases. Successful deployment of these systems requires the provision of full set of features and capabilities found in traditional data managers (e.g., relational systems). An important feature is a declarative query language and its associated query processor. Development of query models and design of query processors is well understood in traditional database management systems. However, the task is complicated in object-oriented systems due to the richness of the data model. The query models necessarily become more complex and their optimization significantly more difficult. The author discusses the issues that need to be considered in the development of query models and in the implementation of query processors in object-oriented databasesystems.< >
We address the generation of execution plans for object-oriented database queries. This is a challenging area of study because, unlike the relational algebra, a uniformly accepted set of object algebra operators has n...
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The issue of executing concurrent transactions reliably in a multidatabase system is addressed. The authors' formalization assumes the most pessimistic scenario where individual database managers that make up the ...
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The issue of executing concurrent transactions reliably in a multidatabase system is addressed. The authors' formalization assumes the most pessimistic scenario where individual database managers that make up the multidatabase system are totally autonomous. The authors present algorithms that ensure transaction atomicity and crash recovery. The atomicity algorithms are based on the emulation of the well-known two-phase commit protocol. It is applied among autonomous participants that neither know of each other's existence nor how to communicate.< >
The traditional approaches to query processing in relational database management systems usually involve the evaluation of elaborate cost functions to determine the “optimal” processing strategy. In some systems, th...
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The traditional approaches to query processing in relational database management systems usually involve the evaluation of elaborate cost functions to determine the “optimal” processing strategy. In some systems, the cost of all applicable strategies are calculated and the one with the minimum cost (usually expressed as expected time) is selected. The evaluation of these cost functions, however, contribute adversely to the query processing performance. This paper discusses the possibility of a different query processing technique: one based on heuristics. The heuristics are determined by investigating the conditions under which a particular strategy offers the best performance. These conditions are identified by means of detailed simulations of a particular database management system model under various environmental conditions. The fundamental question that is being addressed is the feasibility of defining heuristics for query optimization.
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