Digital computer analysis of distributed- lumped-active networks.
Digital computer analysis of networks with distributed, lumped and active elements under steady state excitation, discussing algorithm and accuracy
Huelsman, L. P.↗
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Synthesis of active RC networks containing distributed and lumped elements
Procedure for synthesizing active RC networks containing distributed and lumped elements
Kerwin, W. J.↗
Synthesis of active distributed RC networks
Open-circuit transfer function of two-port network expressed as rational function with real coefficients
TRANSFER FUNCTION↗
Synthesis of active distributed RC networks.
Synthesis technique for RC network using two distributed RC elements, one negative impedance converter and one lumped capacitor
NETWORK SYNTHESIS↗
Analysis and synthesis of distributed lumped active networks by digital computer Semiannual report, 1 Sep. 1968 - 28 Feb. 1969
Network analysis and synthesis by digital computer
Huelsman, L. P.↗
Analysis and synthesis of distributed-lumped- active networks by digital computer Annual report, 1 Sep. 1968 - 31 Aug. 1969
Mathematical modeling and digital computer root locus technique for analysis and synthesis of DLA networks
Huelsman, L. P.↗
Analysis and synthesis of distributed-lumped- active networks by digital computer Annual report, 1 Sep. 1969 - 31 Aug. 1970
Applying digital techniques to analysis and synthesis of DLA networks
Huelsman, L. P.↗
An integrated software package for the analysis and synthesis of distributed-lumped-active networks
A set of digital computer programs for rapidly determining the important characteristics of an arbitrary DLA circuit is described. The circuit characteristics include dominant and non-dominant pole position, magnitude and phase response for sinusoidal steady-state excitation, pole sensitivity, and transient response in the time domain.
Johnson, S. P.↗
Synthesis of low-pass linear-phase active circuits using distributed RC networks
Low pass linear phase active feedback circuit synthesis using distributed RC networks to realize flat magnitude response
Mahdi, H.↗
A distributed lumped active all-pass network configuration.
In this correspondence a new and interesting distributed lumped active network configuration that realizes an all-pass network function is described. A design chart for determining the values of the network elements is included.
Huelsman, L. P.↗
A distributed lumped active biquadratic network function realization
Charts for synthesizing biquadratic network function with complex poles and zeros by means of simple DLA network configuration
Huelsman, L. P.↗
Optimization of an interactive distributive computer network
The activities under a cooperative agreement for the development of a computer network are briefly summarized. Research activities covered are: computer operating systems optimization and integration; software development and implementation of the IRIS (Infrared Imaging of Shuttle) Experiment; and software design, development, and implementation of the APS (Aerosol Particle System) Experiment.
Frederick, V.↗
Modification of the digital computer program DLANET to include the effects of differential-input voltage-controlled voltage sources
Computer program for differential-input voltage- controlled voltage source effects in analysis of distributed lumped active networks
Gentry, M. L.↗
A grid search optimization subroutine for use with the GOSPEL optimization software package
Grid search optimization subroutine for analyses on distributed lumped activity networks
Allgaier, G. R.↗
An optimization technique for lumped-distributed two ports
A frequency domain direct efficient analysis and an optimization technique of a large class of lumped-distributed networks containing active elements are presented. Sensitivity and Hessian matrix calculations are performed using truncated Taylor series expansion of two-port parameters of subnetworks. An interactive computer program was developed to demonstrate the application of the method. Examples of network optimizations are included to illustrate the powerfulness of the technique.
Iobst, K. W.↗
Evolution of NASA's Earth Science Digital Object Identifier Registration System
NASA's Earth Science Data and Information System (ESDIS) Project has implemented a fully automated system for assigning Digital Object Identifiers (DOIs) to Earth Science data products being managed by its network of 12 distributed active archive centers (DAACs). A key factor in the successful evolution of the DOI registration system over last 7 years has been the incorporation of community input from three focus groups under the NASA's Earth Science Data System Working Group (ESDSWG). These groups were largely composed of DOI submitters and data curators from the 12 data centers serving the user communities of various science disciplines. The suggestions from these groups were formulated into recommendations for ESDIS consideration and implementation. The ESDIS DOI registration system has evolved to be fully functional with over 5,000 publicly accessible DOIs and over 200 DOIs being held in reserve status until the information required for registration is obtained. The goal is to assign DOIs to the entire 8000+ data collections under ESDIS management via its network of discipline-oriented data centers. DOIs make it easier for researchers to discover and use earth science data and they enable users to provide valid citations for the data they use in research. Also for the researcher wishing to reproduce the results presented in science publications, the DOI can be used to locate the exact data or data products being cited.
DOI; digital object identifier; mappin↗
Extremely high data-rate, reliable network systems research
Significant progress was made over the year in the four focus areas of this research group: gigabit protocols, extensions of metropolitan protocols, parallel protocols, and distributed simulations. Two activities, a network management tool and the Carrier Sensed Multiple Access Collision Detection (CSMA/CD) protocol, have developed to the point that a patent is being applied for in the next year; a tool set for distributed simulation using the language SIMSCRIPT also has commercial potential and is to be further refined. The year's results for each of these areas are summarized and next year's activities are described.
Foudriat, E. C.↗
Instrumentation and data acquisition systems
A comprehensive and integrated measurement system was identified and a design and development effort initiated to meet the criteria imposed by the National Transonic Facility operating environment. Specific measurement areas receiving concentrated attention include: data acquisition, force measurement, pressure instrumentation, flow visualization techniques, model attitude and model deformation measurement, and temperature measurement. The NTF instrument complex will be centered around four 32-bit, 1-microsecond-cycle-time central processing units connected in a multipoint-distributed network configuration. The principal activities to be supported by these computers are: (1) data base management and processing; (2) research measurement data acquisition and display; (3) tunnel and model control; and (4) process monitoring and communication control. The distributed network approach was chosen to modularize the functional software into definable and implementable parts by the various groups involved in the design and to permit use of similar hardware configurations to improve reliability and maintainability.
Guarino, J. F.↗