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IBM Journal of Research and Development

Issue 2 • Date April 1962

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Displaying Results 1 - 20 of 20
  • Some New High-Speed Tunnel-Diode Logic Circuits

    Publication Year: 1962 , Page(s): 158 - 169
    Cited by:  Papers (5)  |  Patents (1)
    Click to expandAbstract | PDF file iconPDF (899 KB)  

    Several high-speed tunnel-diode logic circuits are presented which perform majority-type logic or majority-type logic with inversion, and make use of a multiphase sinusoidal power supply to obtain signal directivity. Laboratory results are presented which show operation of these circuits at a 125 Mc/sec pulse repetition rate with 2 nsec delay per logical decision. The circuits have also been opera... View full abstract»

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  • Characterization of Tunnel Diode Performance in Terms of Device Figure of Merit and Circuit Time Constant

    Publication Year: 1962 , Page(s): 170 - 178
    Cited by:  Papers (5)
    Click to expandAbstract | PDF file iconPDF (691 KB)  

    Tunnel diode oscillation, flip-flop switching and Goto twin operation have been characterized on the basis of numerical integration of a nonlinear differential equation representing transient behavior in the simplified, lumped equivalent circuit. The results have provided some information for the maximum utility of a tunnel diode having a given figure of merit. A useful relationship is given for s... View full abstract»

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  • Systematics of the Evoked Somatosensory Cortical Potential

    Publication Year: 1962 , Page(s): 179 - 191
    Click to expandAbstract | PDF file iconPDF (1095 KB)  

    This paper presents the results of a series of experimental studies in which a digital computer averaging technique was used to explore the dynamics of the electric response of the human somatosensory cortex evoked by pulse electrical stimulation of nerves in the wrist. A nomenclature is presented for the typical components of the complex waveform which the authors consider to be representative of... View full abstract»

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  • Charge Transport Mechanisms in the Transfer of Latent Electrostatic Images to Dielectric Surfaces

    Publication Year: 1962 , Page(s): 192 - 199
    Cited by:  Papers (4)
    Click to expandAbstract | PDF file iconPDF (653 KB)  

    The transfer of electrostatic charge patterns from one surface to another requires movement of electrical charges across very small air gaps. Gaseous electronics alone is not sufficient to account for charge transport across extremely small gaps. The concept of field emission is introduced as a supplementary mechanism of charge transport and as a source of primary electrons. View full abstract»

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  • The Use of Triple-Modular Redundancy to Improve Computer Reliability

    Publication Year: 1962 , Page(s): 200 - 209
    Cited by:  Papers (129)  |  Patents (12)
    Click to expandAbstract | PDF file iconPDF (862 KB)  

    One of the proposed techniques for meeting the severe reliability requirements inherent in certain future computer applications is described. This technique involves the use of triple-modular redundancy, which is essentially the use of the two-out-of-three voting concept at a low level. Effects of imperfect voting circuitry and of various interconnections of logical elements are assessed. A hypoth... View full abstract»

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  • Pseudo Division and Pseudo Multiplication Processes

    Publication Year: 1962 , Page(s): 210 - 226
    Cited by:  Papers (14)  |  Patents (3)
    Click to expandAbstract | PDF file iconPDF (999 KB)  

    Some digit-by-digit methods for the evaluation of the elementary functions are described. The methods involve processes that resemble repeated-addition multiplication and repeated-subtraction division. Consequently, the methods are easy to implement and the resultant execution times are short. View full abstract»

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  • Minimization Over Boolean Graphs

    Publication Year: 1962 , Page(s): 227 - 238
    Cited by:  Papers (103)
    Click to expandAbstract | PDF file iconPDF (1030 KB)  

    This paper presents a systematic procedure for the design of gate-type combinational switching circuits without directed loops. Each such circuit (Boolean graph) is in correspondence with a sequence of decompositions of the Boolean function which it realizes. A general approach to functional decomposition is given and, in terms of a convenient positional representation, efficient tests for the det... View full abstract»

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  • Generalizations of Horner's Rule for Polynomial Evaluation

    Publication Year: 1962 , Page(s): 239 - 245
    Cited by:  Papers (9)
    Click to expandAbstract | PDF file iconPDF (583 KB)  

    Polynomials are generally evaluated by use of Horner's rule, sometimes referred to as the nesting rule. This rule is sequential and affords no opportunity for parallel computation, i.e., completion of several of the arithmetic operations simultaneously. Two generalizations of Horner's rule which allow for parallel computation are presented here. Schedules and, in some cases, machine codes for eval... View full abstract»

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  • Approximate Methods for a Multiqueueing Problem

    Publication Year: 1962 , Page(s): 246 - 249
    Cited by:  Papers (2)
    Click to expandAbstract | PDF file iconPDF (483 KB)  

    Two approximate methods are described and used to obtain the stationary distribution of the length of a queue which is a small part of a system of many queues. The methods are based on an analogy to statistical mechanics, and give simple approximate solutions of a problem whose exact handling would be extremely complex and would require much more information than is available. View full abstract»

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  • Superconductivity and Ferromagnetism

    Publication Year: 1962 , Page(s): 250 - 255
    Click to expandAbstract | PDF file iconPDF (525 KB)  

    The close relationship between superconductivity and ferromagnetism is discussed and illustrated; it is suggested that several mechanisms cause superconductivity and also ferromagnetism. Various rare earth alloys show simultaneous superconductivity and dilute ferromagnetism. Such dilute ferromagnetism does not occur, however, in the transition-metal superconductors. Striking differences in the eff... View full abstract»

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  • Isotope Effects in Low Temperature Superconductors

    Publication Year: 1962 , Page(s): 256 - 257
    Click to expandAbstract | PDF file iconPDF (318 KB)  

    The critical temperatures of different isotopes of osmium and of zinc have been measured. The results are that Os has no isotope effect, while with Zn the critical temperature is proportional to M−½. These findings, together with our previous work on ruthenium, are consistent with the statement that there is no isotope effect for the transition elements, whereas the full M... View full abstract»

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  • On the Influence of Free Path on the Meissner Effect [Letter to the Editor]

    Publication Year: 1962 , Page(s): 258
    PDF file iconPDF (241 KB)  
    Freely Available from IEEE
  • Comment on “A Network Minimization Problem” [Letter to the Editor]

    Publication Year: 1962 , Page(s): 259
    PDF file iconPDF (239 KB)  
    Freely Available from IEEE
  • A Theoretical Solution for the Magnetic Field in the Vicinity of a Recording Head Air Gap [Letter to the Editor]

    Publication Year: 1962 , Page(s): 260 - 262
    Cited by:  Papers (2)
    PDF file iconPDF (355 KB)  
    Freely Available from IEEE
  • Application of Differential Interferometry with Two Polarized Beams [Letter to the Editor]

    Publication Year: 1962 , Page(s): 263 - 267
    PDF file iconPDF (747 KB)  
    Freely Available from IEEE
  • Comments on the Presence Function of Gazalé [Letter to the Editor]

    Publication Year: 1962 , Page(s): 268 - 269
    Cited by:  Papers (1)
    PDF file iconPDF (384 KB)  
    Freely Available from IEEE
  • Concerning the Possibility of a Cooperative Information Exchange [Letter to the Editor]

    Publication Year: 1962 , Page(s): 270 - 271
    PDF file iconPDF (342 KB)  
    Freely Available from IEEE
  • IBM Technical Papers Published Recently in Other Journals

    Publication Year: 1962 , Page(s): 272 - 284
    PDF file iconPDF (1259 KB)  
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1962 , Page(s): 284 - 285
    PDF file iconPDF (294 KB)  
    Freely Available from IEEE
  • Authors

    Publication Year: 1962 , Page(s): 286 - 288
    PDF file iconPDF (383 KB)  
    Freely Available from IEEE

Aims & Scope

The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center