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  • Other Sources  (246)
  • COMPUTERS  (246)
  • 1970-1974  (246)
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  • 1972  (246)
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  • Other Sources  (246)
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  • 1970-1974  (246)
  • 1950-1954
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  • 1
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    Experimental determination of sticking coefficients (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: A Monte Carlo computer program is used in conjunction with experimental data to determine the sticking coefficient for RTV-501 on silver.
    Keywords: COMPUTERS
    Type: Space Simulation; p 181-192
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  • 2
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    Operating executive for the DSIF tracking subsystem software (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: The advanced engineering model of the DSIF tracking subsystem (DTS) is being developed by the Deep Space Instrumentation Facility. The DTS will provide effective and reliable tracking and data acquisition support for the complex planetary and interplanetary space flight missions planned for the 1970's. The nucleus of the subsystem is a Honeywell H832 digital computer. The design and capabilities of the real-time operating executive software are described.
    Keywords: COMPUTERS
    Type: JPL Quarterly Tech. Rev., Vol. 2, No. 1; p 135-142
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  • 3
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    Input of information recorded on magnetic tape in the BESM-3M computer (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-26
    Description: An input unit designed for the BESM-3M general-purpose digital computer is described. The input unit uses a standard MEZ-28A studio tape recorder. An automatic data-input subroutine is presented.
    Keywords: COMPUTERS
    Type: Morphology of the Quiet and Disturbed Ionosphere; p 69-73
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  • 4
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    Reconstruction errors in digital-to-analog conversion. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Error could theoretically be found as a function of time, midway between any two arbitrarily placed sample points. However, the analysis and the result would be difficult to use. As an alternative, worst-case instantaneous errors can be evaluated near the base-line crossing and at the peak of the analog signal. Location of sample points affects the error values obtained, but use of the points provides a means of comparing different reconstruction techniques. Zero-order conversion is discussed together with first-order conversion, second-order conversion, and third-order conversion.
    Keywords: COMPUTERS
    Type: Instruments and Control Systems; 45; Jan. 197
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  • 5
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    LSI computer fabrication - SUMC/DV. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The SUMC/DV (Space Ultrareliable Modular Computer Demonstration Vehicle), which required the design and fabrication of ten different array types, was designed, partitioned, assembled, tested, and made completely operational in less than one year. This paper describes the assembly, the physical and electrical characteristics, and the basic electrical testing procedures used on SUMC/DV. The paper includes a description of the packaging concepts, the physical assembly, the fabrication and testing of the various components including the LSI/CMOS arrays, the hierarchy of the memory complement, the clock generation and distribution scheme, additional system testing techniques, and the procedure employed in the electrical checkout of the system.
    Keywords: COMPUTERS
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  • 6
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    Simulation, Manual and Computerized (SMAC) (1972)
    In:  CASI
    Details
    Publication Date: 2014-09-09
    Description: The guiding concept was to develop a simulation modeling method which can be quickly taught and learned, yet can be used to solve significant real world problems. SMAC consists of two manual simulation methods and one computer program. One of the manual methods is designed to impart an understanding of simulation; the other is designed to be a practical simulation method. The computer program will simulate queueing situations with up to five parallel servers or up to three series servers. The program is built around GASP 2A routines and retains the 8K capability of GASP.
    Keywords: COMPUTERS
    Type: Auburn Univ. The NASA-ASEE Summer Fac. Fellowship Program; p 475-494
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  • 7
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    A Limited Survey of General Purpose Finite Element Computer Programs (1972)
    In:  CASI
    Details
    Publication Date: 2014-09-09
    Description: Ten representative programs are compared. A listing of additional programs encountered during the course of this effort is also included. Tables are presented to show the structural analysis, material, load, and modeling element capability for the ten selected programs.
    Keywords: COMPUTERS
    Type: Auburn Univ. The NASA-ASEE Summer Fac. Fellowship Program; p 101-141
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  • 8
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    LSI computer design - SUMC/DV. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Advanced Technology Laboratories has designed, built, and tested the first CMOS general-purpose computer. The computer executes 32 instructions that are operation-code compatible with the IBM 360 and RCA Spectra 70 series of computers. The computer is supported by 2k words of main-memory LSI storage and a TTY peripheral for input and output operations. Additionally, a simulator, an assembler, and a loader have been constructed to provide software support to the hardware. This paper provides an overall picture of this computer project.
    Keywords: COMPUTERS
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  • 9
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    A model for the I/O-channel traffic in computer systems. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A new model is proposed which is based on the assumption that the actual traffic to be processed by an I/O channel system is generated as the overflow from a fictitious server system having Poisson traffic as the input. The number of servers and the mean arrival rate can be readily adjusted to verify the main value and the variance of the actual traffic to be handled. A closed solution for the stationary probabilities of state is obtained, and the parameters conventionally used to describe the grade of performance of queuing systems (such as mean queue length, mean waiting time, and probability of waiting) are defined.
    Keywords: COMPUTERS
    Type: Nachrichtentechnische Zeitschrift; 25; Mar. 197
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  • 10
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    Design of NASTRAN demonstration problems (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Criteria and procedures are supplied for the selection, evaluation, and maintenance of an optimum set of demonstration problems to be used for the purposes of checking out the NASTRAN program and demonstrating NASTRAN's capabilities. Also, suggestions are made for a new demonstration problem manual that will better assist the user community in the selection of NASTRAN options and preparation of input data, as well as allow the user to isolate the various options used in the set of demonstration problems.
    Keywords: COMPUTERS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 497-501
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  • 11
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    VIEW: A modification of the RAVFAC view factor program for use with the NASTRAN thermal analyzer (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The NASTRAN thermal analyzer will include the capability to perform complete thermal analyses on structures. One of the inputs to NASTRAN required to simulate radiative heat transfer between surfaces will be the view factors (also called shape factors, form factors, configuration factors) between those surfaces. The purpose of the VIEW program is to compute these view factors and produce appropriate RADMTX and RADLST output to be used as NASTRAN bulk data.
    Keywords: COMPUTERS
    Type: NASTRAN: Users' Experiences e; p 455-463
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  • 12
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    Use of NASTRAN as a teaching aid (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Recent experiences with incorporating NASTRAN as a teaching tool in undergraduate courses was found pedagogically sound. Students with no previous computerized structures background are able to readily grasp the program's logic and begin solving realistic problems rapidly. The educational benefit is significantly enhanced by NASTRAN's plotting feature. However, the cost of operating the level 12 version makes the program difficult to justify.
    Keywords: COMPUTERS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 415-419
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  • 13
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    The BANDIT computer program for the reduction of matrix bandwidth for NASTRAN (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A computer program, BANDIT, is described which was developed for use as a preprocessor to NASTRAN to automatically resequence the grid point numbers for reduced matrix bandwidth. The BANDIT program accepts a standard NASTRAN data deck as input, resequences the grid point numbers for reduced bandwidth, and generates a set of SEQGP cards for insertion into the NASTRAN bulk data deck. BANDIT uses the Cuthill-McKee strategy for resequencing grid points. The program is operational on the CDC 6000 series of computers, the IBM 360, and the Univac 1108.
    Keywords: COMPUTERS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 407-414
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  • 14
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    The NASTRAN contour plotter (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The NASTRAN contour plotter, a group of subroutines and modifications to the NASTRAN plot module, enables contour lines to be superimposed on the plot of the structural model or on an outline of the structural model. The NASTRAN contour plotter can be incorporated into NASTRAN version 12. Consistent with the NASTRAN computer program, it is operational on the IBM 360, the CDC 6000, and the Univac 1108 computers on a variety of plotter hardware.
    Keywords: COMPUTERS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences; p 385-397
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  • 15
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    Modifications and additions to NASTRAN at Marshall Space Flight Center, 1969 - 1972 (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Modifications to NASTRAN code which result from the location, identification, and correction of errors or operational problem areas are reviewed. Addition of improved capability which is structural, executive system oriented, or utility in nature is also considered. NASTRAN efficiencies and inefficiencies are studied.
    Keywords: COMPUTERS
    Type: NASA. Langley Res. Center NASTRAN: Users' Experiences (SEE N72-32867 23-32)
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  • 16
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    Technical and social impact of NASTRAN (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Estimates are made as to the direction in which a new generation of general purpose applications programs can be expected to migrate. Predictions are made as to the impacts that space technology is liable to have within the field of structural engineering and on the society in which it interacts.
    Keywords: COMPUTERS
    Type: NASTRAN: Users' Experiences; p 15-27
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  • 17
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    Pattern recognition of native plant communities: Manitou Colorado test site (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Optimum channel selection among 12 channels of multispectral scanner imagery identified six as providing the best information about 11 vegetation classes and two nonvegetation classes at the Manitou Experimental Forest. Intensive preprocessing of the scanner signals was required to eliminate a serious scan angle effect. Final processing of the normalized data provided acceptable recognition results of generalized plant community types. Serious errors occurred with attempts to classify specific community types within upland grassland areas. The consideration of the convex mixtures concept (effects of amounts of live plant cover, exposed soil, and plant litter cover on apparent scene radiances) significantly improved the classification of some of the grassland classes.
    Keywords: COMPUTERS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Review, Vol. 5; 28 p
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  • 18
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    Discriminant analyses of Bendix scanner data (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Flights over Weslaco, Texas are discussed, using the 9-channel Bendix scanner, providing calibrated data in the 380 to 1000 nm wavelength interval. These flights were at 2000 ft. These data gave seasonal coverage from the time signals, representing mainly the soil background. The ground truth data are provided; signature processing studies relating scanner data to ground truth were also carried out.
    Keywords: COMPUTERS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Review, Vol. 5; 22 p
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  • 19
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    A coactive interdisciplinary research program with NASA (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The applications area of the Texas A&M University remote sensing program consists of a series of coactive projects with NASA/MSC personnel. In each case, the Remote Sensing Center has served to complement and enhance the research capability within the Manned Spacecraft Center. In addition to the applications study area, the Texas A&M University program includes coordinated projects in sensors and data analysis. Under the sensors area, an extensive experimental study of microwave radiometry for soil moisture determination established the effect of soil moisture on the measured brightness temperature for several different soil types. The data analysis area included a project which ERTS-A and Skylab data were simulated using aircraft multispectral scanner measurements at two altitudes. This effort resulted in development of a library of computer programs which provides an operational capability in classification analysis of multispectral data.
    Keywords: COMPUTERS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Rev., Vol. 2; 29 p
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  • 20
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    Bonanza project, 1971 (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Research on the application of remote sensing techniques to the mineral industry stresses photointerpretation by human interpreter experienced in the extraction of geological information from aerial color and multiband photographs and from thermal scanner imagery. Also considered are optical and digital image enhancement, multiband color additive projection, video image processing, and computer reduction and analysis of infrared spectrometry. Evaluation of those parameters which have the most contrast between adjacent rock formations and which can be remotely sensed establish the following most useful geological characteristics: Topographic landform, color, albedo, and surface temperature.
    Keywords: COMPUTERS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Rev., Vol. 2; 23 p
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  • 21
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    Pattern recognition system and procedures (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The ratio transformation technique is used to determine effective features as function of time in remote multiple sensing of crops and soils. The selection of quantizer parameters for a two-class recognition problem under the criteria of minimizing the probability of errors is also discussed.
    Keywords: COMPUTERS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Rev., Vol. 2; 21 p
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  • 22
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    Data processing at the University of Kansas (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Two systems for processing remotely sensed image data have been discussed. The first system, IDECS, is a near real-time hardware system oriented towards processing multi-image data sets quickly and economically. The IDECS has convenient film input and color display output capabilities and implements simple kinds of decision rules. The second system, KANDIDATS, is a software system capable of performing many of the more sophisticated processing methods. Because of its monitor which handles all bookkeeping and its modular design, KANDIDATS easily allows the testing of new automatic processing techniques. After a new technique has been proven on KANDIDATS, it may be simplified and hard-wired in IDECS, thereby keeping the volume processing of remotely sensed data always up to the current state-of-the-art.
    Keywords: COMPUTERS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Rev., Vol. 2; 33 p
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  • 23
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    Summary of 1971 pattern recognition program development (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Eight areas related to pattern recognition analysis at the Earth Resources Laboratory are discussed: (1) background; (2) Earth Resources Laboratory goals; (3) software problems/limitations; (4) operational problems/limitations; (5) immediate future capabilities; (6) Earth Resources Laboratory data analysis system; (7) general program needs and recommendations; and (8) schedule and milestones.
    Keywords: COMPUTERS
    Type: 4th Ann. Earth Resources Program Rev., Vol. 1; 33 p
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  • 24
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    Simulation of mass storage systems operating in a large data processing facility (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A mass storage simulation program was written to aid system designers in the design of a data processing facility. It acts as a tool for measuring the overall effect on the facility of on-line mass storage systems, and it provides the means of measuring and comparing the performance of competing mass storage systems. The performance of the simulation program is demonstrated.
    Keywords: COMPUTERS
    Type: Significant Accomplishments in Technol., GSFC, 1970; p 181-182
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  • 25
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    A computer program to automate residual gas analysis (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A computer program for automatic determination of gases found in an environmental chamber during spacecraft testing is discussed. Program testing is reviewed. The program is being used for the solution of experimental spectra, where the mass spectrometer is used as a contamination monitor by an untrained spectroscopist.
    Keywords: COMPUTERS
    Type: Significant Accomplishments in Technol., GSFC, 1970; p 138-239
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  • 26
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    A computer program to evaluate optical systems (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A computer program is used to evaluate a 25.4 cm X-ray telescope at a field angle of 20 minutes of arc by geometrical analysis. The object is regarded as a point source of electromagnetic radiation, and the optical surfaces are treated as boundary conditions in the solution of the electromagnetic wave propagation equation. The electric field distribution is then determined in the region of the image and the intensity distribution inferred. A comparison of wave analysis results and photographs taken through the telescope shows excellent agreement.
    Keywords: COMPUTERS
    Type: Significant Accomplishment in Technol., GSFC, 1970; p 107-110
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  • 27
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    An On Board Processor (OBP) for OAO C (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A stored program computer and its application on OAO is considered. The parallel computer has a memory capacity of 16,384 words of 18 bits each, one central processor unit, two 4096 word memory units, and one input/output unit. The I/O has no direct data connection with the CPU so that all data flow between these two units must pass through memory by way of the memory data bus. The primary functions of the onboard computer are auxiliary command storage, spacecraft monitoring and malfunction reporting, data compression and status summary, and possible performance of emergency corrective action.
    Keywords: COMPUTERS
    Type: Significant Accomplishments in Technol., GSFC, 1970; p 90-95
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  • 28
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    A Monte Carlo photocurrent/photoemission computer program (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A Monte Carlo computer program was developed for the computation of photocurrents and photoemission in gamma (X-ray)-irradiated materials. The program was used for computation of radiation-induced surface currents on space vehicles and the computation of radiation-induced space charge environments within space vehicles.
    Keywords: COMPUTERS
    Type: NASA, Washington Proc. of the Natl. Symp. on Nat. and Manmade Radiation in Space; p 786-791
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  • 29
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    Ge(Li) data reduction using small computers (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The advantages and limitations of using a small computer to analyze Ge(Li) radiation spectra are studied. The computer has to: (1) find the spectrum peaks, (2) determine the count rate in the photopeaks, and (3) relate the count rate to known gamma transitions to find the amount of each radionuclide present. Results show that tasks one and two may be done by the computer but task three must be done by an experimenter or a larger computer.
    Keywords: COMPUTERS
    Type: NASA, Washington Proc. of the Natl. Symp. on Nat. and Manmade Radiation in Space; p 744-746
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  • 30
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    Carpet plot data format (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Analysis and interpretation of data is the crucial phase of the decision making process. The interplay between variables must be considered as to their relative significance upon the final result, and sometimes time-sensitive decisions must be made when actual events deviate from predicted information, such as Apollo 13. As the number of variables increases past say four, the traditional method of cross-plotting tends to break down, and digital/analog results cannot present a sharply defined method of analysis. A graphical system, the carpet plot, is presented in which an unlimited number of complicated relationships of variables can be evaluated.
    Keywords: COMPUTERS
    Type: NASA, Washington Proc. of the Natl. Symp. on Nat. and Manmade Radiation in Space; p 392-396
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  • 31
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    SUMC multiprocessing operating system (MPOS) requirements document (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Described are the requirements established for the multi-processor operating system (MPOS) to be developed for a multi-processor configuration of the space ultrareliable modular computer (SUMC).
    Keywords: COMPUTERS
    Type: NASA-CR-124371
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  • 32
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    On-board processing for data collection satellite systems (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The research and results for the specific tasks of this program are summarized. The proposed tasks and status discussed include: Coarse frequency measurement, fine frequency measurement, message format design, data reduction, and system error analysis.
    Keywords: COMPUTERS
    Type: NASA-CR-132792
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  • 33
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    NASA automatic system for computer program documentation, volume 2 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The DYNASOR 2 program is used for the dynamic nonlinear analysis of shells of revolution. The equations of motion of the shell are solved using Houbolt's numerical procedure. The displacements and stress resultants are determined for both symmetrical and asymmetrical loading conditions. Asymmetrical dynamic buckling can be investigated. Solutions can be obtained for highly nonlinear problems utilizing as many as five of the harmonics generated by SAMMSOR program. A restart capability allows the user to restart the program at a specified time. For Vol. 1, see N73-22129.
    Keywords: COMPUTERS
    Type: NASA-CR-132752
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  • 34
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    Differential maneuvering simulator data reduction and analysis software (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A multielement data reduction and analysis software package has been developed for use with the Langley differential maneuvering simulator (DMS). This package, which has several independent elements, was developed to support all phases of DMS aircraft simulation studies with a variety of both graphical and tabular information. The overall software package is considered unique because of the number, diversity, and sophistication of the element programs available for use in a single study. The purpose of this paper is to discuss the overall DMS data reduction and analysis package by reviewing the development of the various elements of the software, showing typical results that can be obtained, and discussing how each element can be used.
    Keywords: COMPUTERS
    Type: NASA-TM-X-2705 , L-8675
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  • 35
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    Top down, bottom up structured programming and program structuring (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: New design and programming techniques for shuttle software. Based on previous Apollo experience, recommendations are made to apply top-down structured programming techniques to shuttle software. New software verification techniques for large software systems are recommended. HAL, the higher order language selected for the shuttle flight code, is discussed and found to be adequate for implementing these techniques. Recommendations are made to apply the workable combination of top-down, bottom-up methods in the management of shuttle software. Program structuring is discussed relevant to both programming and management techniques.
    Keywords: COMPUTERS
    Type: NASA-CR-128971 , E-2728-REV-1
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  • 36
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    Speed active multipole filter design with a flexible computer program that calculates the component values for optimum performance. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: COMPUTERS
    Type: Electronic Design; 24; Nov. 23
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    Modular arithmetic weight and cyclic shifting. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: This note shows that the modular arithmetic weight of an integer is invariant to the cyclic shifts of its radix-2 form. This result leads to a reduced search for the minimum weight codeword in a cyclic AN-code as well as to a better understanding of previous work.
    Keywords: COMPUTERS
    Type: Information and Control; 21; Nov. 197
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    Study 2.5 final report. DORCA computer program. Volume 5: Analysis report (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A modification of the Dynamic Operational Requirements and Cost Analysis Program to perform traffic analyses of the automated satellite program is described. Inherent in the analyses of the automated satellite program was the assumption that a number of vehicles were available to perform any or all of the missions within the satellite program. The objective of the modification was to select a vehicle or group of vehicles for performing all of the missions at the lowest possible cost. A vehicle selection routine and the capability to simulate ground based vehicle operational modes were incorporated into the program.
    Keywords: COMPUTERS
    Type: NASA-CR-129267 , ATR-73(7315)-1-VOL-5
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    Study 2.5 final report. DORCA computer program. Volume 4: Executive summary report (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The functions and capabilities of the Dynamic Operational Requirements and Cost Analysis Program are explained. The existence and purpose of the program are presented to provide an evaluation of program applicability to areas of responsibility for potential users. The implementation of the program on the Univac 1108 computer is discussed. The application of the program for mission planning and project management is described.
    Keywords: COMPUTERS
    Type: NASA-CR-129266 , ATR-73(7315)-1-VOL-4
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    ATM experiment S-056 image processing requirements definition (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A plan is presented for satisfying the image data processing needs of the S-056 Apollo Telescope Mount experiment. The report is based on information gathered from related technical publications, consultation with numerous image processing experts, and on the experience that was in working on related image processing tasks over a two-year period.
    Keywords: COMPUTERS
    Type: NASA-CR-123911 , TM-(L)-HU-033/007/00
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    An adaptive replacement algorithm for paged-memory computer systems. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A general class of adaptive replacement schemes for use in paged memories is developed. One such algorithm, called SIM, is simulated using a probability model that generates memory traces, and the results of the simulation of this adaptive scheme are compared with those obtained using the best nonlookahead algorithms. A technique for implementing this type of adaptive replacement algorithm with state of the art digital hardware is also presented.
    Keywords: COMPUTERS
    Type: IEEE Transactions on Computers; C-21; Oct. 197
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    Feedback in sequential machine realizations. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A method is described for determining the realizability of a sequential machine with trigger or set-reset flip-flop memory elements when the feedback of the machine is given by a Boolean function. Feedbacks in several types of sequential machines with different memory elements are compared, showing the memory specifications allowing the realization of such machines.
    Keywords: COMPUTERS
    Type: IEEE Transactions on Computers; C-21; Apr. 197
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    User's manual for MSFC mask and display program (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: All program options and a detailed definition of the format of each input card (with examples) are given. Output options and their applications are detailed. A listing of the main program is provided and all update points are explained. All information required for a designer/draftsman (for program use) is provided, and it will not be necessary to become intimately familiar with the internal operations to effectively use the extensive capability it has to offer.
    Keywords: COMPUTERS
    Type: NASA-TM-X-64696
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    VISCEL: A general-purpose computer program for analysis of linear viscoelastic structures (user's manual), volume 1 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This program, an extension of the linear equilibrium problem solver ELAS, is an updated and extended version of its earlier form (written in FORTRAN 2 for the IBM 7094 computer). A synchronized material property concept utilizing incremental time steps and the finite element matrix displacement approach has been adopted for the current analysis. A special option enables employment of constant time steps in the logarithmic scale, thereby reducing computational efforts resulting from accumulative material memory effects. A wide variety of structures with elastic or viscoelastic material properties can be analyzed by VISCEL. The program is written in FORTRAN 5 language for the Univac 1108 computer operating under the EXEC 8 system. Dynamic storage allocation is automatically effected by the program, and the user may request up to 195K core memory in a 260K Univac 1108/EXEC 8 machine. The physical program VISCEL, consisting of about 7200 instructions, has four distinct links (segments), and the compiled program occupies a maximum of about 11700 words decimal of core storage.
    Keywords: COMPUTERS
    Type: NASA-CR-128345 , JPL-TM-33-466-VOL-1-REV-1
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    A solid state crossbar switch for automatic analog computer patching (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An all-electronic crossbar switch consisting of FET series-shunt switches inside the feedback loops of operational amplifiers was designed and constructed. Time-shared solution of five different differential equations was obtained by using four integrators on ASTRAC 2, with a new solution being generated 250 times per second.
    Keywords: COMPUTERS
    Type: Ariz. Univ. Publ. of the Computer Sci. Res. Lab., 1970 - 1972; p 110-112
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    An Optimization study on a hybrid computer (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The maximum principle is applied to minimum-time optimal-control problems, and an optimization algorithm is presented which can be implemented on a hybrid computer. The state and adjoint equations are set up on ASTRAC 2, a high-speed analog computer capable of 1000 differential equation solutions per second. The optimization algorithm is implemented on a PDP-9, an 18-bit, digital computer. The optimization scheme has global and local search phases and uses a vector optimization criterion. Second and third-order bang-bang control systems are studied as examples.
    Keywords: COMPUTERS
    Type: Publ. of the Computer Sci. Res. Lab., 1970 - 1972; p 82-92
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    Hybrid coding systems study (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The state of efficiency improvement available with high speed decoders presently in operation or under development is summarized. The required ratio of bit-energy-to-noise-density is given in each case for bit error probabilities.
    Keywords: COMPUTERS
    Type: NASA-CR-114486
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    Relabeling of finite element meshes using a random process (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: An algorithm is presented to relabel automatically the nodes of an arbitrary finite-element mesh. The purpose of such relabeling is to reduce the bandwidth of the master stiffness matrix produced by the finite-element method. The algorithm uses a random process for the relabeling. Computing time is reduced substantially, compared to systematic methods.
    Keywords: COMPUTERS
    Type: NASA-TM-X-2660 , E-7001
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    An application of interactive graphics to neutron spectrometry (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The use of interactive graphics is presented as an attractive method for performing multi-parameter data analysis of proton recoil distributions to determine neutron spectra. Interactive graphics allows the user to view results on-line as the program is running and to maintain maximum control over the path along which the calculation will proceed. Other advantages include less time to obtain results and freedom from handling paper tapes and IBM cards.
    Keywords: COMPUTERS
    Type: NASA-TM-X-68062 , E-6934
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    Advanced data management system analysis techniques study (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The state of the art of system analysis is reviewed, emphasizing data management. Analytic, hardware, and software techniques are described.
    Keywords: COMPUTERS
    Type: NASA-CR-128513
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    Computer enhancement through interpretive techniques (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The improvement in the usage of the digital computer through the use of the technique of interpretation rather than the compilation of higher ordered languages was investigated by studying the efficiency of coding and execution of programs written in FORTRAN, ALGOL, PL/I and COBOL. FORTRAN was selected as the high level language for examining programs which were compiled, and A Programming Language (APL) was chosen for the interpretive language. It is concluded that APL is competitive, not because it and the algorithms being executed are well written, but rather because the batch processing is less efficient than has been admitted. There is not a broad base of experience founded on trying different implementation strategies which have been targeted at open competition with traditional processing methods.
    Keywords: COMPUTERS
    Type: NASA-CR-122469
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    Development of AMTRAN on the Datacraft DC6024 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The AMTRAN system was implemented on the Datacraft DC6024 computer. Activities were directed toward providing greater user convenience and faster operation, development of a multiuser time sharing capability, and system support for user applications. The major portion of time was devoted to completing a two-user time sharing operating system and initiating work on an n-user system, with plans to provide service to up to n=8 users at this time. Flowcharts for the multiuser AMTRAN system are presented. The Datacraft DC6024 AMTRAN time sharing system comprises both software internal to AMTRAN and in the computer operating system. Only the AMTRAN portion is presented.
    Keywords: COMPUTERS
    Type: NASA-CR-123796 , MSFC-SE-1528
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    Quantization noise in digital speech (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The amount of quantization noise generated in a digital-to-analog converter is dependent on the number of bits or quantization levels used to digitize the analog signal in the analog-to-digital converter. The minimum number of quantization levels and the minimum sample rate were derived for a digital voice channel. A sample rate of 6000 samples per second and lowpass filters with a 3 db cutoff of 2400 Hz are required for 100 percent sentence intelligibility. Consonant sounds are the first speech components to be degraded by quantization noise. A compression amplifier can be used to increase the weighting of the consonant sound amplitudes in the analog-to-digital converter. An expansion network must be installed at the output of the digital-to-analog converter to restore the original weighting of the consonant sounds. This technique results in 100 percent sentence intelligibility for a sample rate of 5000 samples per second, eight quantization levels, and lowpass filters with a 3 db cutoff of 2000 Hz.
    Keywords: COMPUTERS
    Type: NASA-TM-X-58097 , MSC-07225
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    Data processing 2: Advancements in large scale data processing systems for remote sensing (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The development of large scale data processing systems for remote sensing is studied by evaluating: (1) the suitability of several sensor types with regard to producing data required for multispectral machine analysis; (2) various types of data preprocessing necessary to prepare such data for analysis; and (3) transfer of machine processing techniques for earth resources data to user community.
    Keywords: COMPUTERS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Rev., Vol. 2; 31 p
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    Data processing 1: Advancements in machine analysis of multispectral data (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Multispectral data processing procedures are outlined beginning with the data display process used to accomplish data editing and proceeding through clustering, feature selection criterion for error probability estimation, and sample clustering and sample classification. The effective utilization of large quantities of remote sensing data by formulating a three stage sampling model for evaluation of crop acreage estimates represents an improvement in determining the cost benefit relationship associated with remote sensing technology.
    Keywords: COMPUTERS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Rev., Vol. 2; 13 p
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    Extended precision software packages (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: A description of three extended precision packages is presented along with three small conversion subroutines which can be used in conjunction with the extended precision packages. These extended packages represent software packages written in FORTRAN 4. They contain normalized or unnormalized floating point arithmetic with symmetric rounding and arbitrary mantissa lengths, and normalized floating point interval arithmetic with appropriate rounding. The purpose of an extended precision package is to enable the user to use and manipulate numbers with large decimal places as well as those with small decimal places where precision beyond double precision is required.
    Keywords: COMPUTERS
    Type: NASA-TM-X-65968 , X-552-72-119
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    IBM system/360 assembly language interval arithmetic software (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Computer software designed to perform interval arithmetic is described. An interval is defined as the set of all real numbers between two given numbers including or excluding one or both endpoints. Interval arithmetic consists of the various elementary arithmetic operations defined on the set of all intervals, such as interval addition, subtraction, union, etc. One of the main applications of interval arithmetic is in the area of error analysis of computer calculations. For example, it has been used sucessfully to compute bounds on sounding errors in the solution of linear algebraic systems, error bounds in numerical solutions of ordinary differential equations, as well as integral equations and boundary value problems. The described software enables users to implement algorithms of the type described in references efficiently on the IBM 360 system.
    Keywords: COMPUTERS
    Type: NASA-TM-X-65971 , X-552-72-147
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    Arbitrary grammars generating context-free languages (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: If G is a grammar such that in each noncontext-free rule of G, the right side contains a string of terminals longer than any terminal string appearing between two nonterminals in the left side; then the language generated by G is context-free. Six previous results follow as simple corollaries of this theorem.
    Keywords: COMPUTERS
    Type: NASA-CR-127764 , REPT-11-72
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    Development of spectral analysis math models and software program and spectral analyzer, digital converter interface equipment design (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Spectral analyses of angle-modulated communication systems is studied by: (1) performing a literature survey of candidate power spectrum computational techniques, determining the computational requirements, and formulating a mathematical model satisfying these requirements; (2) implementing the model on UNIVAC 1230 digital computer as the Spectral Analysis Program (SAP); and (3) developing the hardware specifications for a data acquisition system which will acquire an input modulating signal for SAP. The SAP computational technique uses extended fast Fourier transform and represents a generalized approach for simple and complex modulating signals.
    Keywords: COMPUTERS
    Type: NASA-CR-115711 , TRW-20817-H012-R0-00
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    Shuttle operations simulation model programmers'/users' manual (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The prospective user of the shuttle operations simulation (SOS) model is given sufficient information to enable him to perform simulation studies of the space shuttle launch-to-launch operations cycle. The procedures used for modifying the SOS model to meet user requirements are described. The various control card sequences required to execute the SOS model are given. The report is written for users with varying computer simulation experience. A description of the components of the SOS model is included that presents both an explanation of the logic involved in the simulation of the shuttle operations cycle and a description of the routines used to support the actual simulation.
    Keywords: COMPUTERS
    Type: NASA-CR-123735 , ASD-ASTN-1533
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    Study of sequential decoding (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Sequential decoding problems considered deal with reliable transmission through noise space channels and encoding of space sources for the purpose of data suppression.
    Keywords: COMPUTERS
    Type: NASA-CR-114450
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    Reliability techniques for computer executive programs (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Computer techniques for increasing the stability and reliability of executive and supervisory systems were studied. Program segmentation characteristics are discussed along with a validation system which is designed to retain the natural top down outlook in coding. An analysis of redundancy techniques and roll back procedures is included.
    Keywords: COMPUTERS
    Type: NASA-CR-123736
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    Handbook of operation and maintenance instructions for Model 5208A bit synchronizer unit (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Electrical/mechanical characteristics, operation, theory of operation, parts list, and electrical diagrams for the model 5208A bit synchronizer unit are provided. The unit is capable of performing the functions of bit synchronization and signal conditioning on demodulated wave trains containing amplitude, frequency, and phase distortions, as well as additive noise. Operating frequencies in the 1 to 27 MHz bit rate range are accommodated through the use of discrete frequency plug-in subunits. The unit provides 0 and 180 degree clocks and either a single signal hard decision, or a three bit quantized soft decision data output.
    Keywords: COMPUTERS
    Type: NASA-CR-115645 , REPT-86185
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    Asynchronous sampling of speech with some vocoder experimental results (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The method of asynchronously sampling speech is based upon the derivatives of the acoustical speech signal. The following results are apparent from experiments to date: (1) It is possible to represent speech by a string of pulses of uniform amplitude, where the only information contained in the string is the spacing of the pulses in time; (2) the string of pulses may be produced in a simple analog manner; (3) the first derivative of the original speech waveform is the most important for the encoding process; (4) the resulting pulse train can be utilized to control an acoustical signal production system to regenerate the intelligence of the original speech.
    Keywords: COMPUTERS
    Type: NASA-CR-127256 , NASA-6 , UILU-ENG-72-2542
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    FGRAAL: FORTRAN extended graph algorithmic language (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The FORTRAN version FGRAAL of the graph algorithmic language GRAAL as it has been implemented for the Univac 1108 is described. FBRAAL is an extension of FORTRAN 5 and is intended for describing and implementing graph algorithms of the type primarily arising in applications. The formal description contained in this report represents a supplement to the FORTRAN 5 manual for the Univac 1108 (UP-4060), that is, only the new features of the language are described. Several typical graph algorithms, written in FGRAAL, are included to illustrate various features of the language and to show its applicability.
    Keywords: COMPUTERS
    Type: NASA-CR-127263 , TR-179
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    Application of an onboard processor to the OAO C spacecraft (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The design of a stored program computer for spacecraft use and its application on the fourth Orbiting Astronomical Observatory (OAO) is reported. The computer is a medium scale, parallel machine with a memory capacity of 16384 words of 18 bits each. It possesses a comprehensive instruction repertoire and operates on 45 W of power (including the dc-to-dc converter). The machine operates at a 500-kHz rate and executes an add instruction in 10 microseconds. Its primary functions on OAO C will be auxiliary command storage, spacecraft monitoring and malfunction reporting, data compression and status summary, and possible performance of emergency corrective action for certain anomalous situations.
    Keywords: COMPUTERS
    Type: NASA-TM-X-65937 , X-715-72-226
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    Checkout/demonstration application program for the SEL 840MP Multi-Processing Control System: Version 1 (MPCS/1) (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: The characteristics of the application program were developed to verify and demonstrate the SEL 840MP Multi-Processing Control System - Version I (MPCS/1). The application program emphasizes the display support and task control capabilities. The application program is further intended to be used as an aid to familization with MPCS/1. It complements the information provided in the MPCS/1 Users Guide, Volume I and II.
    Keywords: COMPUTERS
    Type: NASA-CR-123716 , REPT-72-0013
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    Data compression/error correction digital test system. Appendix 3: Maintenance. Book 2: Receiver assembly drawings (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The assembly drawings of the receiver unit are presented for the data compression/error correction digital test system. Equipment specifications are given for the various receiver parts, including the TV input buffer register, delta demodulator, TV sync generator, memory devices, and data storage devices.
    Keywords: COMPUTERS
    Type: NASA-CR-115607 , REPT-86-185B-APP-3-BK-2
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    Data compression/error correction digital test system. Appendix 3: Maintenance. Book 1: Transmitter assembly drawings (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Assembly drawings, logic schematics, and circuit schematics useful in maintaining the equipment of the DC/EC digital test system are reviewed. The drawings are organized in accordance with the reference designations of the hardware. The transmitter subsystem assembly drawings are emphasized.
    Keywords: COMPUTERS
    Type: NASA-CR-115597 , REPT-86-185A-APP-3-BK-1
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    Scientific computation systems quality branch manual (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A manual is presented which is designed to familiarize the GE 635 user with the configuration and operation of the overall system. Work submission, programming standards, restrictions, testing and debugging, and related general information is provided for GE 635 programmer.
    Keywords: COMPUTERS
    Type: NASA-CR-126770
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    STEEP32 computer code (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: A manual is presented as an aid in using the STEEP32 code. The code is the EXEC 8 version of the STEEP code (STEEP is an acronym for shock two-dimensional Eulerian elastic plastic). The major steps in a STEEP32 run are illustrated in a sample problem. There is a detailed discussion of the internal organization of the code, including a description of each subroutine.
    Keywords: COMPUTERS
    Type: NASA-CR-126749
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    Multi-processing control system for the SEL 840MP (MPCS/1) users guide. Volume 1: Programming guide (1972)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: A programmer's manual is presented for the SEL 840MP multiprocessing control system MPCS. The topics discussed include task control; defining displays; MPCS calls for task control functions; MPCS calls and system interfaces for display functions; MPCS calls for input/output functions and services, file management, and utility services; and MPCS assembly language call sequence summary.
    Keywords: COMPUTERS
    Type: NASA-CR-123559 , REPT-72-0012-VOL-1
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    Apollo experience report: Real-time auxiliary computing facility development (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Apollo real time auxiliary computing function and facility were an extension of the facility used during the Gemini Program. The facility was expanded to include support of all areas of flight control, and computer programs were developed for mission and mission-simulation support. The scope of the function was expanded to include prime mission support functions in addition to engineering evaluations, and the facility became a mandatory mission support facility. The facility functioned as a full scale mission support activity until after the first manned lunar landing mission. After the Apollo 11 mission, the function and facility gradually reverted to a nonmandatory, offline, on-call operation because the real time program flexibility was increased and verified sufficiently to eliminate the need for redundant computations. The evaluation of the facility and function and recommendations for future programs are discussed in this report.
    Keywords: COMPUTERS
    Type: NASA-TN-D-6855 , MSC-S-326
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  • 74
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    Conceptual design and feasibility evaluation model of a 10 to the 8th power bit oligatomic mass memory. Volume 1: Conceptual design (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The oligatomic (mirror) thin film memory technology is a suitable candidate for general purpose spaceborne applications in the post-1975 time frame. Capacities of around 10 to the 8th power bits can be reliably implemented with systems designed around a 335 million bit module. The recommended mode was determined following an investigation of implementation sizes ranging from an 8,000,000 to 100,000,000 bits per module. Cost, power, weight, volume, reliability, maintainability and speed were investigated. The memory includes random access, NDRO, SEC-DED, nonvolatility, and dual interface characteristics. The applications most suitable for the technology are those involving a large capacity with high speed (no latency), nonvolatility, and random accessing.
    Keywords: COMPUTERS
    Type: NASA-CR-123635 , PX-6676-VOL-1
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  • 75
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    Improvements of magnetic heads through the use of new and refined core materials (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A process for making ferromagnetic films with high permeability and development of the technology for fabricating a magnetic head using these films are reported. An interim head was successfully built, tested, and delivered for evaluation and a process for sputtering high permeability films has been developed. Two heads with deposited pole tips have been tested and delivered. One had a 0.0001 inch gap and the other a 0.0003 inch gap. Both heads were boned with epoxy but served to test the geometry of the head design.
    Keywords: COMPUTERS
    Type: NASA-CR-122403
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  • 76
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    Optimized solution of Kepler's equation (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A detailed description is presented of KEPLER, an IBM 360 computer program used for the solution of Kepler's equation for eccentric anomaly. The program KEPLER employs a second-order Newton-Raphson differential correction process, and it is faster than previously developed programs by an order of magnitude.
    Keywords: COMPUTERS
    Type: NASA-TN-D-6712 , G-1066
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  • 77
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    The MSFC UNIVAC 1108 EXEC 8 simulation model (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A model is presented which simulates the MSFC Univac 1108 multiprocessor system. The hardware/operating system is described to enable a good statistical measurement of the system behavior. The performance of the 1108 is evaluated by performing twenty-four different experiments designed to locate system bottlenecks and also to test the sensitivity of system throughput with respect to perturbation of the various Exec 8 scheduling algorithms. The model is implemented in the general purpose system simulation language and the techniques described can be used to assist in the design, development, and evaluation of multiprocessor systems.
    Keywords: COMPUTERS
    Type: NASA-CR-61379
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  • 78
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    Conceptual design of a 10 to the 8th power bit magnetic bubble domain mass storage unit and fabrication, test and delivery of a feasibility model (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The conceptual design of a highly reliable 10 to the 8th power-bit bubble domain memory for the space program is described. The memory has random access to blocks of closed-loop shift registers, and utilizes self-contained bubble domain chips with on-chip decoding. Trade-off studies show that the highest reliability and lowest power dissipation is obtained when the memory is organized on a bit-per-chip basis. The final design has 800 bits/register, 128 registers/chip, 16 chips/plane, and 112 planes, of which only seven are activated at a time. A word has 64 data bits +32 checkbits, used in a 16-adjacent code to provide correction of any combination of errors in one plane. 100 KHz maximum rotational frequency keeps power low (equal to or less than, 25 watts) and also allows asynchronous operation. Data rate is 6.4 megabits/sec, access time is 200 msec to an 800-word block and an additional 4 msec (average) to a word. The fabrication and operation are also described for a 64-bit bubble domain memory chip designed to test the concept of on-chip magnetic decoding. Access to one of the chip's four shift registers for the read, write, and clear functions is by means of bubble domain decoders utilizing the interaction between a conductor line and a bubble.
    Keywords: COMPUTERS
    Type: NASA-CR-123577 , MSFC-DRL-232
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  • 79
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    Program documentation standards (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A style manual is presented to serve as a reference and guide for system and program documentation. It is intended to set standards for documentation, prescribing the procedures to be followed, format to be used, and information to be produced. The standards for program documentation specify the extent to which the programmer should support his efforts in writing. The first three sections of the manual (system, program, and operation descriptions) contain information of particular interest to management, operators, and program users, respectively. Each section was designed as a self-sufficient description from the management, operator, or user point of view.
    Keywords: COMPUTERS
    Type: NASA-TM-X-65874 , X-564-72-65
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  • 80
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    Analyses of requirements for computer control and data processing experiment subsystems. Volume 2: ATM experiment S-056 image data processing system software development (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The IDAPS (Image Data Processing System) is a user-oriented, computer-based, language and control system, which provides a framework or standard for implementing image data processing applications, simplifies set-up of image processing runs so that the system may be used without a working knowledge of computer programming or operation, streamlines operation of the image processing facility, and allows multiple applications to be run in sequence without operator interaction. The control system loads the operators, interprets the input, constructs the necessary parameters for each application, and cells the application. The overlay feature of the IBSYS loader (IBLDR) provides the means of running multiple operators which would otherwise overflow core storage.
    Keywords: COMPUTERS
    Type: NASA-CR-123572 , TM-(L)-HU-033/006/00-VOL-2
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  • 81
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    Analyses of requirements for computer control and data processing experiment subsystems. Volume 1: ATM experiment S-056 image data processing system techniques development (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The solar imaging X-ray telescope experiment (designated the S-056 experiment) is described. It will photograph the sun in the far ultraviolet or soft X-ray region. Because of the imaging characteristics of this telescope and the necessity of using special techniques for capturing images on film at these wave lengths, methods were developed for computer processing of the photographs. The problems of image restoration were addressed to develop and test digital computer techniques for applying a deconvolution process to restore overall S-056 image quality. Additional techniques for reducing or eliminating the effects of noise and nonlinearity in S-056 photographs were developed.
    Keywords: COMPUTERS
    Type: NASA-CR-123573 , TM-(L)-HU-033/005/00-VOL-1
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  • 82
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    An improved multiple linear regression and data analysis computer program package (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: NEWRAP, an improved version of a previous multiple linear regression program called RAPIER, CREDUC, and CRSPLT, allows for a complete regression analysis including cross plots of the independent and dependent variables, correlation coefficients, regression coefficients, analysis of variance tables, t-statistics and their probability levels, rejection of independent variables, plots of residuals against the independent and dependent variables, and a canonical reduction of quadratic response functions useful in optimum seeking experimentation. A major improvement over RAPIER is that all regression calculations are done in double precision arithmetic.
    Keywords: COMPUTERS
    Type: NASA-TN-D-6770 , E-6718
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  • 83
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    Flight program language requirements. Volume 3: Appendices (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Government-sponsored study and development efforts were directed toward design and implementation of high level programming languages suitable for future aerospace applications. The study centered around an evaluation of the four most pertinent existing aerospace languages. Evaluation criteria were established, and selected kernels from the current Saturn 5 and Skylab flight programs were used as benchmark problems for sample coding. An independent review of the language specifications incorporated anticipated future programming requirements into the evaluation. A set of language requirements was synthesized from these activities.
    Keywords: COMPUTERS
    Type: NASA-CR-123569 , REPT-72-0005-VOL-3
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  • 84
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    Interactive graphics system for IBM 1800 computer (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A FORTRAN compatible software system that has been developed to provide an interactive graphics capability for the IBM 1800 computer is described. The interactive graphics hardware consists of a Hewlett-Packard 1300A cathode ray tube, Sanders photopen, digital to analog converters, pulse counter, and necessary interface. The hardware is available from IBM as several related RPQ's. The software developed permits the application programmer to use IBM 1800 FORTRAN to develop a display on the cathode ray tube which consists of one or more independent units called pictures. The software permits a great deal of flexibility in the manipulation of these pictures and allows the programmer to use the photopen to interact with the displayed data and make decisions based on information returned by the photopen.
    Keywords: COMPUTERS
    Type: NASA-TM-X-65859 , X-692-72-92
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  • 85
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    Support software for the advanced on-board processor (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The support software package is described which exists for the advanced on-board processor (AOP) being developed as a general purpose stored program digital computer, with an 18-bit word.
    Keywords: COMPUTERS
    Type: NASA-TM-X-65843 , X-715-72-11
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  • 86
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    FORTRAN 4 programs for the extraction of potential well parameters from the energy dependence of total elastic scattering cross sections (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An attempt has been made to keep the programs as subroutine oriented as possible. Usually only the main programs are directly concerned with the problem of total cross sections. In particular the subroutines POLFIT, BILINR, GASS59/MAXLIK, SYMOR, MATIN, STUDNT, DNTERP, DIFTAB, FORDIF, EPSALG, REGFAL and ADSIMP are completely general, and are concerned only with the problems of numerical analysis and statistics. Each subroutine is independently documented.
    Keywords: COMPUTERS
    Type: NASA-CR-129179 , WIS-TCI-469G
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  • 87
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    Engineering study for the functional design of a multiprocessor system (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results are presented of a study to generate a functional system design of a multiprocessing computer system capable of satisfying the computational requirements of a space station. These data management system requirements were specified to include: (1) real time control, (2) data processing and storage, (3) data retrieval, and (4) remote terminal servicing.
    Keywords: COMPUTERS
    Type: NASA-CR-128601 , TR-14-72
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  • 88
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    Suitability of the normal density assumption for processing multispectral scanner data. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Assessment of the normal likelihood function as an aid in the processing of multispectral scanner data. The experimental results of described tests indicate that the use of the normal likelihood function is justified for recognition processing of multispectral data.
    Keywords: COMPUTERS
    Type: IEEE Transactions on Geoscience Electronics; GE-10; Oct. 197
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  • 89
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    Computer analysis of general linear networks using digraphs. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Investigation of the application of digraphs in analyzing general electronic networks, and development of a computer program based on a particular digraph method developed by Chen. The Chen digraph method is a topological method for solution of networks and serves as a shortcut when hand calculations are required. The advantage offered by this method of analysis is that the results are in symbolic form. It is limited, however, by the size of network that may be handled. Usually hand calculations become too tedious for networks larger than about five nodes, depending on how many elements the network contains. Direct determinant expansion for a five-node network is a very tedious process also.
    Keywords: COMPUTERS
    Type: International Journal of Electronics; vol. 33
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  • 90
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    Terminal context in context-sensitive grammars. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Investigation of the conditions whereunder context-sensitive grammars generate context-free languages. The obtained results indicate that, if every noncontext-free rewriting rule of a context-sensitive grammar has as left context a string of terminal symbols and the left context is at least as long as the right context, then the language generated is context-free. Likewise, if every noncontext-free rewriting rule of a context-sensitive grammar has strings of terminal symbols as left and right contexts, then the language generated is also context-free.
    Keywords: COMPUTERS
    Type: SIAM Journal on Computing; 1; Mar. 197
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  • 91
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    Finite group homomorphic sequential systems. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A class of finite-state sequential systems evolving in groups is considered. It represents a broader class of input-output relations than those found in linear system theory. The concepts of controllability, observability, minimality, realizability, and the isomorphism of minimal realizations are developed. Results that are analogous to, but differ in essential details from, those of linear system theory are derived. Algorithmic design and algebraic decoding may benefit from these results.
    Keywords: COMPUTERS
    Type: IEEE Transactions on Automatic Control; AC-17; Aug. 197
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  • 92
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    Performance measures for transform data coding. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: This paper develops performance criteria for evaluating transform data coding schemes under computational constraints. Computational constraints that conform with the proposed basis-restricted model give rise to suboptimal coding efficiency characterized by a rate-distortion relation R(D) similar in form to the theoretical rate-distortion function. Numerical examples of this performance measure are presented for Fourier, Walsh, Haar, and Karhunen-Loeve transforms.
    Keywords: COMPUTERS
    Type: AD-754128 , IEEE Transactions on Communications; COM-20; June 197
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  • 93
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    Job-mix modeling and system analysis of an aerospace multiprocessor. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An aerospace guidance computer organization, consisting of multiple processors and memory units attached to a central time-multiplexed data bus, is described. A job mix for this type of computer is obtained by analysis of Apollo mission programs. Multiprocessor performance is then analyzed using: 1) queuing theory, under certain 'limiting case' assumptions; 2) Markov process methods; and 3) system simulation. Results of the analyses indicate: 1) Markov process analysis is a useful and efficient predictor of simulation results; 2) efficient job execution is not seriously impaired even when the system is so overloaded that new jobs are inordinately delayed in starting; 3) job scheduling is significant in determining system performance; and 4) a system having many slow processors may or may not perform better than a system of equal power having few fast processors, but will not perform significantly worse.
    Keywords: COMPUTERS
    Type: IEEE Transactions on Computers; C-21; May 1972
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  • 94
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    Strain-biased PLZT input devices /page composers/ for holographic memories and optical data processing. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The features of a new class of transparent ferroelectric ceramic materials, called PLZT, are described. PLZT are shown to have very strong electrooptic properties and memory, and are switched through transparent electrodes when mechanically strained. Because of these properties, they can be used to fabricate two-dimensional page composers for coherent optical systems. Techniques for fabricating such devices are outlined along with preliminary test results. Applications in displays are shown to be also feasible.
    Keywords: COMPUTERS
    Type: CLEA PAPER 18,6
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  • 95
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    CIRCAL-2 - General-purpose on-line circuit design. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: CIRCAL-2 is a second-generation general-purpose on-line circuit-design program with the following main features: (1) multiple-analysis capability; (2) uniform and general data structures for handling text editing, network representations, and output results, regardless of analysis; (3) special techniques and structures for minimizing and controlling user-program interaction; (4) use of functionals for the description of hysteresis and heat effects; and (5) ability to define optimization procedures that 'replace' the user. The paper discusses the organization of CIRCAL-2, the aforementioned main features, and their consequences, such as a set of network elements and models general enough for most analyses and a set of functions tailored to circuit-design requirements. The presentation is descriptive, concentrating on conceptual rather than on program implementation details.
    Keywords: COMPUTERS
    Type: IEEE; vol. 60
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  • 96
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    Fault tolerant data management system (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Described in detail are: (1) results obtained in modifying the onboard data management system software to a multiprocessor fault tolerant system; (2) a functional description of the prototype buffer I/O units; (3) description of modification to the ACADC and stimuli generating unit of the DTS; and (4) summaries and conclusions on techniques implemented in the rack and prototype buffers. Also documented is the work done in investigating techniques of high speed (5 Mbps) digital data transmission in the data bus environment. The application considered is a multiport data bus operating with the following constraints: no preferred stations; random bus access by all stations; all stations equally likely to source or sink data; no limit to the number of stations along the bus; no branching of the bus; and no restriction on station placement along the bus.
    Keywords: COMPUTERS
    Type: NASA-CR-128553 , MA-129TB
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  • 97
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    Interpretation and automatic image enhancement processing facility (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: COMPUTERS
    Type: E72-10125 , NASA-CR-128179
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  • 98
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    Unsupervised classification of remote multispectral sensing data (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The new unsupervised classification technique for classifying multispectral remote sensing data which can be either from the multispectral scanner or digitized color-separation aerial photographs consists of two parts: (a) a sequential statistical clustering which is a one-pass sequential variance analysis and (b) a generalized K-means clustering. In this composite clustering technique, the output of (a) is a set of initial clusters which are input to (b) for further improvement by an iterative scheme. Applications of the technique using an IBM-7094 computer on multispectral data sets over Purdue's Flight Line C-1 and the Yellowstone National Park test site have been accomplished. Comparisons between the classification maps by the unsupervised technique and the supervised maximum liklihood technique indicate that the classification accuracies are in agreement.
    Keywords: COMPUTERS
    Type: NASA-CR-123799 , TR-220-1075
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  • 99
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    Data compression/error correction digital test system. Appendix 1: Operation (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The DC/EC operating instructions are provided for anticipated operating conditions. The instructions are supported by illustrations and tables for the controls and indication of radiation-built equipment. The transmitter control panel provides a functional representation of the system configuration. Inputs and outputs of functional units are brought to jacks on the panel for interconnection and monitoring, and to allow independent use of subsystems of the transmitter.
    Keywords: COMPUTERS
    Type: NASA-CR-115643 , REPT-86185-D
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  • 100
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    Computer system simulation and analysis (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A simulation model has been developed as a tool for studying different computer system configurations. The model simulates a computer system in terms of the number and speed of hardware subsystems and the runs processed by the system in terms of equivalent adds for computation and data bits transferred for I/O. The model was written in the GPSS simulation language.
    Keywords: COMPUTERS
    Type: NASA-CR-61376
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