By Topic

IBM Journal of Research and Development

Issue 3 • Date May 1976

Filter Results

Displaying Results 1 - 17 of 17
  • Table of Contents

    Publication Year: 1976, Page(s): 197
    IEEE is not the copyright holder of this material | PDF file iconPDF (190 KB)
    Freely Available from IEEE
  • Generalized Kraft Inequality and Arithmetic Coding

    Publication Year: 1976, Page(s):198 - 203
    Cited by:  Papers (115)  |  Patents (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (443 KB)

    Algorithms for encoding and decoding finite strings over a finite alphabet are described. The coding operations are arithmetic involving rational numbers li as parameters such that ∑i2−li≤2−ε. This coding technique requires no blocking, and the per-symbol length of the encoded string approaches the associated entropy wi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of the Berlekamp-Massey Linear Feedback Shift-Register Synthesis Algorithm

    Publication Year: 1976, Page(s):204 - 212
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    An analysis of the Berlekamp-Massey Linear Feedback Shift-Register (LFSR) Synthesis Algorithm is provided which shows that an input string of length n requires O(n2) multiplication/addition operations in the underlying field of definition. We also derive the length distribution for digit strings of length n. Results show that, on the average, the encoded length is no greater than n + 1 ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Deep-UV Conformable-Contact Photolithography for Bubble Circuits

    Publication Year: 1976, Page(s):213 - 221
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (561 KB)

    The techniques of deep-ultraviolet (UV) conformable-contact photolithography are described and some preliminary work reported on their application to the fabrication of high-density bubble memory circuits by single-level masking. A quantitative analysis of tolerance requirements for linewidth, mask-to-wafer gap, and exposure is made for printing with conventional UV and deep-UV, for feature sizes ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Lattice Dynamics with Three-Body Forces: Solid Xe and Kr

    Publication Year: 1976, Page(s):222 - 227
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (397 KB)

    Phonon dispersion curves, elastic constants, and the pV isotherms are calculated for solid Xe and Kr at 0 K using quasiharmonic lattice dynamics derived from multiparameter pair potentials. The computations account for the Axilrod-Teller-Muto three-body triple-dipole forces that arise in third-order perturbation theory. Approximate allowance is also made for anharmonic effects and, in the case of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • LSI Yield Modeling and Process Monitoring

    Publication Year: 1976, Page(s):228 - 234
    Cited by:  Papers (51)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (462 KB)

    This paper describes an analytical technique for quantifying and modeling the frequency of occurrence of integrated circuit failures. The method is based on the analysis of random and clustered defects on wafers with defect monitors. Results from pilot line data of photolithographic defects, insulator short circuits, and leaky pn junctions are presented to support the practicality of the approach.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Delayed Closed-Loop Scheme for Stepping Motor Control

    Publication Year: 1976, Page(s):235 - 243
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (498 KB)

    An efficient method for control of stepping motor speed and position, the delayed closed-loop (DCL) mode, is described. The new technique permits control of high-speed motor motion by means of a programmed speed-displacement characteristic. The method combines the static-speed control characteristic of the open-loop mode with the stable dynamic behavior of the closed-loop mode. Unlike other scheme... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimization of Single Expressions in a Relational Data Base System

    Publication Year: 1976, Page(s):244 - 257
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (661 KB)

    This paper examines optimization within a relational data base system. It considers the optimization of a single query defined by an expression of the relational algebra. The expression is transformed into an equivalent expression or sequence of expressions that cost less to evaluate. Alternative transformations, and combinations of several transformations, are analyzed. Measurements on an experim... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dependence of Ink Jet Dynamics on Fluid Characteristics

    Publication Year: 1976, Page(s):258 - 270
    Cited by:  Patents (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (625 KB)

    Measurements of jet velocity, separation length, and stream stability (freedom from random fluctuations in drop position) were made for several fluids, including two inks. The data were then compared with modified fluid flow and jet stability equations. In one case velocity is related to applied pressure drop through a flow equation that depends primarily on the shape and size of the nozzle and on... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Amorphous Materials for Micrometer and Submicrometer Bubble Domain Technology

    Publication Year: 1976, Page(s):271 - 281
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (637 KB)

    A review and critique is made of those material and processing issues that pertain to the implementation of micrometer and submicrometer bubble devices on amorphous films. Adequate reproducibility and uniformity have been achieved in ternary amorphous films prepared by rf sputtering and their magnetic characteristics are very similar to those of analogous garnet films. Factors that may limit appli... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Complex Convolutions via Fermat Number Transforms

    Publication Year: 1976, Page(s):282 - 284
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (289 KB)

    An approach is described for computing complex convolutions modulo a Fermat number. It is shown that this technique is particularly efficient when the complex convolution is computed by means of Fermat Number Transforms and leads to improved implementation of complex digital filters. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Speckle Pattern Interferometry of Vibration Modes

    Publication Year: 1976, Page(s):285 - 289
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    An optical facility is described for the study of the vibrational behavior of engineering test pieces. Time-average holography and electronic speckle pattern methods of analysis are combined into one system. The speckle pattern method is used for the identification of resonances, frequency tuning, and object alignment, thereby optimizing the number of holographic exposures. An evaluation is made o... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comment on “Segment Synthesis in Logical Data Base Design” [Letter to the Editor]

    Publication Year: 1976, Page(s): 290
    IEEE is not the copyright holder of this material | PDF file iconPDF (221 KB)
    Freely Available from IEEE
  • Recent Papers by IBM Authors

    Publication Year: 1976, Page(s):291 - 295
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (415 KB)

    Reprints of the papers listed here may usually be obtained by writing directly to the authors. The authors' IBM divisions are identified as follows: DPD is the Data Processing Division; FED, Field Engineering Division; FSD, Federal Systems Division; GPD, General Products Division; GSD, General Systems Division; OPD, Office Products Division; RES, Research Division; SCD, System Communications Divis... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recent IBM Patents

    Publication Year: 1976, Page(s):296 - 297
    IEEE is not the copyright holder of this material | PDF file iconPDF (208 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1976, Page(s):298 - 300
    IEEE is not the copyright holder of this material | PDF file iconPDF (222 KB)
    Freely Available from IEEE
  • Errata [Erratum]

    Publication Year: 1976, Page(s): 300
    IEEE is not the copyright holder of this material | PDF file iconPDF (223 KB)
    Full text access may be available. Click article title to sign in or learn about subscription options.

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.

Learn about subscribing to this journal >

Full Aims & Scope

Meet Our Editors

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