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By Topic

Transactions of the I.R.E. Professional Group on Electronic Computers

Includes the top 50 most frequently accessed documents for this publication according to the usage statistics for the month of

  • Application of Boolean algebra to switching circuit design and to error detection

    Publication Year: 1954, Page(s):6 - 12
    Cited by:  Papers (120)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1328 KB)

    A solution is sought to the general problem of simplifying switching circuits that have more than one output. The mathematical treatment of the problem applies only to circuits that may be represented by “polynomials” in Boolean algebra. It is shown that certain parts of the multiple output problem for such circuits may be reduced to a single output problem whose inputs are equal in ... View full abstract»

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  • Solution of Linear Differential Equations with Variable Coefficients by the Electronic Differential Analyzer

    Publication Year: 1953, Page(s):3 - 8
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1798 KB)

    A relay device is described which varies resistance in a stepwise continuous manner in order to approximate arbitrary functions of time. The device can be used with electronic differential analyzers to solve linear differential equations with variable coefficients. Sample solutions of Bessel's equation are included as examples. Calibration and measurement techniques which permit computer accuracie... View full abstract»

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  • Static-dynamc design of flip-flop circuits

    Publication Year: 1952, Page(s):6 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1163 KB)

    The following investigation on flip-flop circuits was originally undertaken to determine if a reliable flip-flop circuit could be designed to operate from a low supply voltage using tubes that are presently available and in production. The reason for designing the circuit to operate from a low supply voltage is to reduce the required power consumption of such information storage devices to a minim... View full abstract»

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  • A desk-model electronic analog computer

    Publication Year: 1954, Page(s):20 - 24
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (981 KB)

    A description is given of an analog computer comparable in size to an automatic desk calculator. By combining the techniques of electronic and electric analogs, a high problem-solving capacity is achieved in a minimum of space. Nine stable high-gain dc amplifiers are provided, each of which can be made to produce a variety of functional responses. This is accomplished by allowing the operator to b... View full abstract»

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  • An algebraic theory for use in digital computer design

    Publication Year: 1954, Page(s):12 - 21
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1770 KB)

    An algebraic theory of the logical operation of digital computers is developed. This theory takes into account the dynamic (time) behavior of computer processes. The computer signals and computer elements are described. Their properties which are pertinent to the logical operation of digital computers are abstracted and. formulated in mathematical terms. The signals are represented by algebraic sy... View full abstract»

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  • Computer Definitions [Guest Editorial]

    Publication Year: 1953, Page(s): 2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (203 KB)

    This guest editorial notes that in the preparation of this glossary, there was no intention to dictate what language people should use. Instead the policy of other compilers of dictionaries was used. The intent was to record usage, considering both the extent of usage and just who uses certain terms in certain ways. The policy of recording usage appears to be the only way to aid in eliminating dia... View full abstract»

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  • A digital computer for airborne control systems

    Publication Year: 1952, Page(s):2 - 5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3076 KB)

    A digital computer has been developed for use in airborne control systems. This application presents many problems. The computer must be small, light weight, and very reliable. It receives its input signals from instruments in the rest of the system. These signals are of the “analogue” continuous type and must be converted into the discrete electric signals used in the computer. The ... View full abstract»

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  • Professional group on electronic computers system organization of the DYSEAC

    Publication Year: 1954, Page(s):1 - 10
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1886 KB)

    The DYSEAC is a complete general-purpose high-speed digital computer utilizing the same basic electronic circuit elements as those in SEAC. In the DYSEAC, however, these basic building blocks have been organized into a more powerful system for controlling and responding to auxiliary devices. Communication between these auxiliary devices and the DYSEAC (or between the DYSEAC and the persons operati... View full abstract»

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  • An improved reading system for magnetically recorded digital data

    Publication Year: 1954, Page(s):22 - 25
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (802 KB)

    In magnetic recording of pulses, whether on drum or tape, the resulting flux pattern is affected by proximity of adjacent pulses. The best defined region is that adjacent to the maximum. In reading, the signal is the derivative of the flux. In the best defined region, this is close to a straight line passing through zero when the flux is a maximum. The slope of the curve at the zero changes sign w... View full abstract»

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  • A Photoelectric Decimal-Coded Shaft Digitizer

    Publication Year: 1953, Page(s):1 - 4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1579 KB)

    This aper describes a non-counting decimal-coded shaft digitizer. Phototubes are used to read the posi-of masks, permitting static as well as dynamic readout with minimum loading of the measured shaft. Reading is done with several units, each reading a digit of the decimal number representing the shaft position. A special decimal code enmploying 5 phototubes per decade is used to avoid intra-decad... View full abstract»

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  • Operating experience with UNIVAC SYSTEMS

    Publication Year: 1952, Page(s):33 - 46
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4276 KB)

    In December 1951, at the joint AIEE/IRE Computer Conference held in Philadelphia, several papers were given which discussed the performance of a single UNIVAC SYSTEM∗ during its first eight months of operation. Although only eight months have passed since that performance summary was given, a much greater effective length of time has passed because three more UNIVAC SYSTEMS have ... View full abstract»

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  • Applications of CRC-105 decimal digital differential analyzer

    Publication Year: 1952, Page(s):19 - 24
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1807 KB)

    In the two years since the first digital differential analyzer was put in operation, it has been the complexity of filling and operating such machines, rather than any difficulty in coding them for a problem, that has constituted the main impediment to convenience and efficiency in their use. In filling some hundred-odd binary digits, one at a time, for each integrator information, the possibility... View full abstract»

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  • The use of a reflected code in digital control systems

    Publication Year: 1954, Page(s):1 - 6
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1055 KB)

    The reflected (Gray) binary code has previously been used primarily in analog-to-digital conversion applications. However, the reflected binary code has, in addition, characteristics which strongly recommend it as a design factor in the synthesis of digital elements within closed-loop control systems. This paper describes several designs of typical reflected binary switching circuits. These switch... View full abstract»

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  • An operational-digital feedback divider

    Publication Year: 1954, Page(s):17 - 22
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    The following article describes a device capable of finding the quotient of two numbers expressed in parallel binary code. Feedback type of operation is employed to form a closed loop wherein the desired quotient is the only possible steady state. The system response is similar to that of an RC circuit. The associated time constant is directly proportional to the pulse rate involved. This device h... View full abstract»

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  • An automatic cruise control computer for long range aircraft

    Publication Year: 1952, Page(s):47 - 51
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (691 KB)

    This paper presents a qualitative discussion of present manual cruise control techniques and a proposed automatic cruise control system for long range military aircraft. A mechanization of the cruise control computer and its operation are described, and a comparison of the automatic system operation with current manual techniques is presented. Although the application of the cruise control compute... View full abstract»

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  • An Analog-to-Digital Converter

    Publication Year: 1953, Page(s):5 - 7
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    A shaft position to binary number converter suitable for use as an input device for a digital computer is described. The basic component of the converter is a binary mechanical revolution counter having an output in the form of voltages or pulses on parallel lines representing, in the binary number system, the quantity stored in the counter. Ambiguities are eliminated by a novel method of internal... View full abstract»

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  • Multidimensional magnetic memory selection systems

    Publication Year: 1952, Page(s):25 - 32
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (773 KB)

    Many investigators have for several years been studying the use of rectangular loop magnetic cores as memory elements. It seems profitable at this time to examine, from a dimensional point of view, the various selection systems which have been developed, and to find the relations between their operating principles. View full abstract»

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  • An analog multiplier using thyrite

    Publication Year: 1954, Page(s):42 - 45
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    An investigation into the use of thyrite as an inexpensive nonlinear element in the electronic analog computer indicates that this material has great value as a device capable of delivering an output voltage proportional to the square of the input voltage. The factors discussed are the characteristics of the material and the means by which these may be modified to produce a device capable of squar... View full abstract»

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  • A function generator for the solution of engineering design problems

    Publication Year: 1954, Page(s):34 - 38
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (781 KB)

    The solution of nonlinear engineering design problems demonstrates the need for a special function generator. The generator described in this paper satisfies this need. The basic components of the unit are discussed and the forms of functions which can be generated are shown. Accuracy is estimated by comparison of an oscillogram with the calculated curves. It is concluded from tests on the system ... View full abstract»

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  • A time-sharing analog multiplier

    Publication Year: 1954, Page(s):11 - 17
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1616 KB)

    This article describes the design of a high speed electronic analog computing circuit which easily lends itself to time-sharing applications. By making use of a special high accuracy electronic switch and circuitry carefully designed to be independent of tube characteristics, it was possible to achieve a full-scale accuracy of better than 0.2 per cent over a wide range of input values. The unit de... View full abstract»

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  • A computer for flaw plotting

    Publication Year: 1952, Page(s):73 - 75
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (530 KB)

    Ultrasonic vibrations provide the only known physical means for the non-destructive examination of thick sections of dense materials. The basic method is simple; the equipment is relatively inexpensive, and there is no hazard to operating personnel. Ultrasonics will not completely supplant the older, established techniques of radiographic, magnetic, or dye inspection methods, but it will do inspec... View full abstract»

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  • A digital voltage encoder

    Publication Year: 1954, Page(s):25 - 28
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (715 KB)

    A two-channel voltage encoder having a sampling rate of 40 numbers/second in each channel has been designed for use in a data reduction system. The data are recorded on single-channel magnetic tape in the form of 10-digit binary numbers with an accuracy of ± 0.1 per cent. The range of input voltage is 0 to 1 volt and may be lowered to 0 to 10 mv through the use of chopper amplifiers. This l... View full abstract»

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Aims & Scope

This Transactions ceased publication in 1954. The current retitled publication is 

IEEE Transactions on Computers.

Full Aims & Scope