The parallel computer SMS 201 consists of 128 microprocessors with individual access to a private communication memory. Data transfer between the memories is by table-controlled data exchange coordinated by a main pro...
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The parallel computer SMS 201 consists of 128 microprocessors with individual access to a private communication memory. Data transfer between the memories is by table-controlled data exchange coordinated by a main processor. A simulator developed for composing and testing SMS programs allows the programs to be run on a conventional sequential computer and also provides debugging aids. A precompiler belonging to the simulator allows problem-oriented imputting by the user and generates the required FORTRAN input for the simulator.
Large collections of computer programs are required to carry out the many different calculations that arise in the course of determining the structure of a large molecule. The ROCKS system of computer programs is avai...
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Large collections of computer programs are required to carry out the many different calculations that arise in the course of determining the structure of a large molecule. The ROCKS system of computer programs is available to carry out most of the calculations involved in data acquisition and structure determination by the isomorphous replacement and molecular replacement methods. ROCKS is designed to be general, easy to use, reliable and efficient. It now includes facilities for precession and oscillation film scanning, data reduction, Wilson statistics, structure-factor calculations, isomorphous-replacement phasing, atomic-parameter least-squares refinement, Fourier, Patterson and difference-Fourier calculations, contouring and peak searching, local scaling, Patterson superpositions, product and R-factor translational searches, phase combination and phase refinement by electron density modification. 26 refs.
In an effort to be of service to the lighting community, the IES computer Committee presents an annual compendium of available computer programs, services, and equipment. A list of 12 groups and individuals that have ...
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In an effort to be of service to the lighting community, the IES computer Committee presents an annual compendium of available computer programs, services, and equipment. A list of 12 groups and individuals that have lighting-related software available through a variety of arrangements is given.
The purpose of this study has been to present an evaluation of a practical plug-flow reactor model. The author has provided an outline of the mathematical basis of a nonviscous, ideal gas phase model. A description is...
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The purpose of this study has been to present an evaluation of a practical plug-flow reactor model. The author has provided an outline of the mathematical basis of a nonviscous, ideal gas phase model. A description is given of the structure of the three overlays of the computer program, for input, for computation, and for output. For purposes of comparison with other available procedures, estimates were made of the costs of using this program on a typical problem. A comparison has also been made of the author's procedure with some likely alternatives. This information should provide a basis for the physical chemist or other chemical kineticist who wishes to use computer modeling as a tool.
Predicting the execution time of computer programs is an important but challenging problem in the community of computer systems. Existing methods require experts to perform detailed analysis of program code in order t...
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ISBN:
(纸本)9781617823800
Predicting the execution time of computer programs is an important but challenging problem in the community of computer systems. Existing methods require experts to perform detailed analysis of program code in order to construct predictors or select important features. We recently developed a new system to automatically extract a large number of features from program execution on sample inputs, on which prediction models can be constructed without expert knowledge. In this paper we study the construction of predictive models for this problem. We propose the SPORE (Sparse Polynomial REgression) methodology to build accurate prediction models of program performance using feature data collected from program execution on sample inputs. Our two SPORE algorithms are able to build relationships between responses (e.g., the execution time of a computer program) and features, and select a few from hundreds of the retrieved features to construct an explicitly sparse and non-linear model to predict the response variable. The compact and explicitly polynomial form of the estimated model could reveal important insights into the computer program (e.g., features and their non-linear combinations that dominate the execution time), enabling a better understanding of the program's behavior. Our evaluation on three widely used computer programs shows that SPORE methods can give accurate prediction with relative error less than 7% by using a moderate number of training data samples. In addition, we compare SPORE algorithms to state-of-the-art sparse regression algorithms, and show that SPORE methods, motivated by real applications, outperform the other methods in terms of both interpretability and prediction accuracy.
Students can learn a great deal from a study of tactisms and usually find it a stimulating topic. However, because of practical problems the topic is often avoided. The author describes a sequence of computer simulati...
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Students can learn a great deal from a study of tactisms and usually find it a stimulating topic. However, because of practical problems the topic is often avoided. The author describes a sequence of computer simulation programs designed to supplement practical work on the topic.
PHYLIP, PAUP, and HENNIG 86 include programs designed for inferring all most parsimonious trees of relationships from observed character patterns. These programs failed to do this in the case of a rather simple, non‐...
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Lorenzen and Sieg (1991) claimed that the computer parsimony programs PHYLIP, PAUP and HENNIG86 failed in finding all most parsimonious trees and produced erroneous solutions when applied to a simple character data ma...
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Provides a checklist useful to teachers purchasing programs or wishing to create their own programs, suggesting that creating and evaluating programs on the precepts of goal setting, curiosity, and fantasy should ensu...
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Provides a checklist useful to teachers purchasing programs or wishing to create their own programs, suggesting that creating and evaluating programs on the precepts of goal setting, curiosity, and fantasy should ensure a good return on the software production/purchasing dollar. (MP)
This paper contains and describes a BASIC program which takes chemical numbers generated in concentration values by atomic absorption analysis, weight and insoluble residue data of powdered samples and calculates the ...
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This paper contains and describes a BASIC program which takes chemical numbers generated in concentration values by atomic absorption analysis, weight and insoluble residue data of powdered samples and calculates the chemical concentrations in the rock; prints the results in publishable table form and automatically transmits the recalculated data to the mainframe computer. A FORTRAN 77 version of the program is also provided.
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