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Electronic Computers, IRE Transactions on

Issue 1 • Date March 1961

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  • [Front cover]

    Publication Year: 1961 , Page(s): c1
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    Freely Available from IEEE
  • IRE Professional Group on Electronic Computers

    Publication Year: 1961 , Page(s): nil1
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    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 1961 , Page(s): nil1
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    Freely Available from IEEE
  • Unate Truth Functions

    Publication Year: 1961 , Page(s): 1 - 6
    Cited by:  Papers (37)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1167 KB)  

    This paper contains some applications of an elementary study of unate truth functions. One application is a method of deciding when a truth function is linearly separated, i. e., is expressible as a linear polynomial inequality in its arguments (letting 1 represent truth and 0 represent falsity). Other applications are to contact nets and to rectifier nets. Much of the material of this paper, although not in print, is well known to some logicians and switching theorists. Nothing from the first three sections is original. View full abstract»

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  • Linear-Input Logic

    Publication Year: 1961 , Page(s): 6 - 16
    Cited by:  Papers (77)
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    Techniques are developed for the logical design of magnetic core circuits to produce arbitrary single-output combinational switching functions. The approach is based on the relationship of a single magnetic core circuit to a linearly separable switching function. A synthesis procedure is developed which uses a pair of logical primitives, AND with NOT and OR with NOT, which are similar to the STROKE primitive and its inverse. Procedures are developed for the synthesis of symmetric functions which require no more than the integral part of (n+3)/2 cores, approximately half the number used in previously published procedures. The synthesis of arbitrary switching circuits is treated as a linear programming problem, and a table of all four-variable circuits is presented in which no circuit requires more than three cores. View full abstract»

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  • Axiomatic Majority-Decision Logic

    Publication Year: 1961 , Page(s): 17 - 21
    Cited by:  Papers (25)
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    An algebra suited to logical design with majority-decision elements (parametrons, Esaki diodes, etc.) is developed axiomatically. The utility of the new algebra is demonstrated by resolving sample problems. View full abstract»

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  • Computer Design of Multiple-Output Logical Networks

    Publication Year: 1961 , Page(s): 21 - 30
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1879 KB)  

    An important step in the design of digital machines lies in the derivation of the Boolean expressions which describe the combinational logical networks in the system. Emphasis is generally placed upon deriving expressions which are minimal according to some criteria. A computer program has been prepared which automatically derives a set of minimal Boolean expressions describing a given logical network with multiple-output lines. The program accepts punched cards listing the in-out relations for the network, and then prints a list of expressions which are minimal according to a selected one of three criteria. This paper describes the basic design procedure and the criteria for minimality. View full abstract»

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  • Games That Teach the Fundamentals of Computer Operation

    Publication Year: 1961 , Page(s): 31 - 41
    Cited by:  Papers (1)
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    One who wishes to give a group of laymen a feeling for the way we computer engineers can coax sophisticated information-handling behavior from an organization of simple physical elements can provide a striking on-the-spot example by training his laymen to simulate various kinds of simple elements and by organizing them into a network whose behavior is obviously more sophisticated than that of any element. Each individual watches the up-down hand position of one or two others, and adjusts his own hand position according to a response task which is equivalent to that of an AND, OR, NOT, or flip-flop element¿although task assignments are made in such a way that the participants don't hear a single esoteric word, nor realize that they might be doing ``logic.'' Counters, shift registers, and adders may be organized and operated in a way which proves very entertaining to participants and on-lookers, and yet which provides them with very realistic basic concepts about how a computer might work. View full abstract»

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  • Bilateral Switching Using Nonsymmetric Elements

    Publication Year: 1961 , Page(s): 42 - 50
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    Magnetic-core memory elements characteristically require bipolar applied fields. The vanishing inner diameter of toroids and the loss of the third dimension entirely in deposited thin films demands minimization of the number of wires. A configuration which has been investigated and applied in a word organized memory at the University of California at Los Angeles is illustrated in Fig. 2. It consists of a pair of mutually inverted and parallel connected transistors. The transistors are not in general symmetrical. This paper discusses some of the system considerations which determine the important design parameters. Methods for location of regions of satisfactory operation in the many-variable space of the inverted transistor pair are described. Although a particular design problem is discussed, attention is focused on the question, ``What classical and new procedures can we use to reduce the number of dimensions in such design problems?'' The power of the computer as a design tool is crucially dependent upon such processes. View full abstract»

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  • Ferrite Toroid Core Circuit Analysis

    Publication Year: 1961 , Page(s): 51 - 56
    Cited by:  Papers (4)
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    An analysis of the terminal characteristics of thin ferrite toroid cores under arbitrary drive and load conditions is presented. The analysis is founded only on the following two experimentally confirmed conditions: 1) the time required for a complete reversal of flux under unloaded conditions is inversely proportional to the magnitude of a step-driving field which is in excess of the critical field required to initiate flux change; 2) the open circuit voltage-time output waveforms caused by step driving currents are identical when normalized with respect to amplitude and time. The normalized output voltage waveform f¿(x) is used to develop a terminal characteristic equation. It is shown that f¿(x) may be obtained by using a nonideal step-input current. Utilizing a modified Gaussian equation to represent f¿(x), equations are developed to allow the prediction of core response to arbitrary input waveforms, using 4 parameters easily obtained from voltage response vs NI step-drive plots, and f(x), which is the integral of the normalized expression for the open circuit voltage f¿(x), and is proportional to the flux switched in the core. The equations are expanded to include a load circuit and to test the validity of the expressions developed. Theoretical and experimental results are compared for a core loaded with series RL and RLC circuits with both ramp and step-drive currents. Agreement is shown to be good, even though the core used was not particularly thin. View full abstract»

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  • A Digital Static Magnetic Wire Storage with Nondestructive Read-Out

    Publication Year: 1961 , Page(s): 56 - 62
    Cited by:  Papers (2)
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    After a brief review of pertinent magnetic effects and sonic wave propagation in elastic media, a nonvolatile, digital, magnetic storage scheme is described, wherein binary words may be stored by magnetizing segments of a wire, and the information may be read out an unlimited number of times with no deterioration of the stored information. Two storage schemes are presented: a temporary, electrically addressed storage, and a permanent, program-type store. Bit-storage density, read-out and input pulse shapes, and read-out frequency are noted. Possible limitations such as losses, temperature effects, and pulse shape are balanced against advantages and a comparison is made to a number of other types of bit storage. View full abstract»

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  • Correction

    Publication Year: 1961 , Page(s): 62
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  • A Digital Correlator Based on the Residue Number System

    Publication Year: 1961 , Page(s): 63 - 70
    Cited by:  Papers (5)  |  Patents (1)
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    A system design for a digital correlator based on the application of the residue number system for computation is presented. Areas of investigation include sampling, analog-to-residue conversion, logical design of the arithmetic units, residue-to-analog conversion, and modes of operation of the proposed digital correlator. The advantages of speed of computation and simplicity of logic due to the use of a residue number system are shown to result in a significantly faster and simpler system than if a conventional number system were used. The resulting digital correlator is designed for megacycle sampling and computation with a 0.1 per cent system precision. View full abstract»

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  • A Function Generator Using Cold-Cathode Selector Tubes

    Publication Year: 1961 , Page(s): 71 - 77
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    A method of generating voltages which are arbitrary functions of time is suggested in which a chain of cold-cathode selector tubes is used as a single-pole, multi-position switch: accuracies of ±1 per cent can be achieved with relatively simple adjustment. A generator using this method is described in detail, and typical output curves are shown. The generator is extremely versatile, not only due to the range of functions which can be produced, but also due to its ability to: 1) operate over a wide range of speeds, 2) change instantaneously from one speed to another, and 3) generate two separate functions, one displaced with respect to the other by a variable, preset delay. View full abstract»

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  • Initial Conditions in Computer Simulation

    Publication Year: 1961 , Page(s): 78 - 80
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    A technique is developed for the straightforward simulation of the transfer function of a certain class of linear systems. This method is particularly well adapted to the analysis of systems with fixed transfer function and variable initial conditions and forcing functions. In particular, a single simulation, minimal in its use of integrators, will suffice to handle forcing functions and initial conditions on both input and output. View full abstract»

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  • 1960 PGEC Membership Report

    Publication Year: 1961 , Page(s): 81 - 91
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    The third biennial PGEC Membership Survey was completed in the Fall of 1960. The response to the questionnaire was excellent (58 per cent), and the data extracted are reported herein. Factors regarding the nature of work, geographic location, salary, education, and fringe benefits are reported. Bar graphs, curves, and commentary are included to aid in assessing the Professional Group's character and growth. View full abstract»

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  • High-Order Probability Generators

    Publication Year: 1961 , Page(s): 92 - 93
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  • Self-Repairing Computers

    Publication Year: 1961 , Page(s): 93 - 94
    Cited by:  Papers (1)
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  • Majority Gates Applied to Simultaneous Comparators

    Publication Year: 1961 , Page(s): 94 - 95
    Cited by:  Papers (1)
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  • On Internal Variable Assignments for Sequential Switching Circuits

    Publication Year: 1961 , Page(s): 95 - 96
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  • Further Results on the N-tuple Pattern Recognition Method

    Publication Year: 1961 , Page(s): 96
    Cited by:  Papers (8)
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  • A Possibly Misleading Conclusion as to the Inferiority of One Method for Pattern Recognition to a Second Method to which it is Guaranteed to be Superior

    Publication Year: 1961 , Page(s): 96 - 97
    Cited by:  Papers (1)
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  • Further Comments on the N-tuple Pattern Recognition Method

    Publication Year: 1961 , Page(s): 97
    Cited by:  Papers (1)
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  • Computer Model of Gambling and Bluffing

    Publication Year: 1961 , Page(s): 97 - 98
    Cited by:  Papers (2)
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  • A Squaring Analog-Digital Converter

    Publication Year: 1961 , Page(s): 98 - 100
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Aims & Scope

This Transactions ceased publication in 1962. The current retitled publication is 

IEEE Transactions on Computers.

Full Aims & Scope