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Articles 811 - 817 of 817
Full-Text Articles in Physical Sciences and Mathematics
Collecting Data About Logic Simulation, Roger D. Chamberlain, Mark A. Franklin
Collecting Data About Logic Simulation, Roger D. Chamberlain, Mark A. Franklin
All Computer Science and Engineering Research
Design of high performance hardware and software based gate-switch level logic simulators requires knowledge about the logic simulation process itself. Unfortunately, little data is publically available concerning key aspects of this process. An example of this is the lack of published empirical measurements relating to the time distribution of events generated by such simulators. This paper presents a gate-switch level logic simulator lsim which is oriented towards the collection of data about the simulation process. The basic components of lsim are reviewed, and its relevant data gathering facilities are discussed. An example is presented which illustrates the use of lsim …
Ads Formal Semantics, Takayuki Kimura
Ads Formal Semantics, Takayuki Kimura
All Computer Science and Engineering Research
Abstract Database System (ADS) is a data model developed for an enduring medical information system where frequent changes in the conceptual schema are anticipated and multi-level abstraction is required. The mechanism of abstraction in ADS is based on the abstraction operator of the lamba calculus. The formal semantics of a subset of the ADS model is presented using the denotational specification method.
Some Design Considerations For Picture Archiving And Communication Systems, J. R. Cox, G. J. Blaine, R. L. Hill, R. G. Jost, C. D. Shum
Some Design Considerations For Picture Archiving And Communication Systems, J. R. Cox, G. J. Blaine, R. L. Hill, R. G. Jost, C. D. Shum
All Computer Science and Engineering Research
Design considerations for picture archiving and communication systems are reviewed with special emphasis on those issues that differ from conventional network architectures. Design equations for three layers of a picture network are developed and discussed in the context of preliminary estimates of the flow of digital images between a multiplicity of picture sources, picture archives and picture viewing stations. Discussions of differences from conventional networks focuses on the local nature of the net, the availability of a wide-band transmission media with low error rates, the relative costliness of network equipment capable of taking advantage of the wide-band transmission media and …
Octal-Tree Spatial Sorting And Its Applications, Jeffrey L. Posdamer
Octal-Tree Spatial Sorting And Its Applications, Jeffrey L. Posdamer
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An octal tree subdivision recursively divides a bounded three-dimensional volume into octanta about an internal division point. This scheme has been used to represent cellular or enumerated voxel models of solid objects. Given one or more sets of points sampled from the surface of a solid, an octal tree may be generated in which each leaf node contains m or less points. By specifying the tree traversal rule, the points are accessed in a sorted order. By defining m=3, a divide-and-conquer surface triangulation algorithm may be developed which does not require special sampling conditions (such as co-planarity) on subsets of …
An Abstract Model Of Unstratified Database System, Takayuki D. Kimura, Jerome R. Cox Jr., Will D. Gillett
An Abstract Model Of Unstratified Database System, Takayuki D. Kimura, Jerome R. Cox Jr., Will D. Gillett
All Computer Science and Engineering Research
A semantic data model is introduced with the following capabilities: (1) Abstraction mechanisms for aggregation, generalization and classification, (2) Unstratified control of the database content, (3) Refined control of intentional and extensional information, and (4) Extensive semantic consistency checking. The basic features of the model are illustrated through a scenario of interactions between the user and the database system (using the proposed model) for constructing a simple database on technical publications.
Design Studies Suggested By An Abstract Model For Medical Information System, Jerome R. Cox Jr., Takayuki D. Kimura, P. Moore, Will D. Gillett, Mishell J. Stucki
Design Studies Suggested By An Abstract Model For Medical Information System, Jerome R. Cox Jr., Takayuki D. Kimura, P. Moore, Will D. Gillett, Mishell J. Stucki
All Computer Science and Engineering Research
We have developed a formal model of a database system that is unusual in that it has the ability to represent information about its own structure and to insure semantic consistency. The model distinguishes general laws from instances of events and objects, but many of its mechanisms serve both categories of information. The model form a substrate upon which an information structure appropriate to neonatology is being developed. Some example queries are shown and a design study for an associative memory suggested by the model is described briefly.
Synchronization Strategies, Mishell J. Stucki, Jerome R. Cox Jr
Synchronization Strategies, Mishell J. Stucki, Jerome R. Cox Jr
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Computing systems are now frequently composed of independently clocked subsystems that cooperate to perform the function desired for the whole. This type of architecture has many advantages and promises to be the standard for the foreseeable future. With the trend towards more and more gates per chip, the number of chips per subsystem gets smaller and smaller, and we can expect to soon see one or more subsystems per chip. This transition will require contributions from disciplines previously outside the field of chip design, and every issue will have to be carefully worked out beforehand because debugging chips of this …