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IBM Journal of Research and Development

Issue 5 • Date Sept. 1974

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Displaying Results 1 - 13 of 13
  • Interatomic Potentials and Defect Energetics in Dilute Alloys

    Publication Year: 1974 , Page(s): 386 - 394
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (464 KB)  

    Effective interatomic potentials for impurities in aluminum have been constructed according to pseudopotential theory. Based on a local model potential, impurity valence and size factors are defined and their effects on the potential discussed. With these potentials, detailed calculations based on a Green's function lattice statics method are made for the impurity-vacancy binding energy and the difference in diffusion activation energies for an impurity and a host atom. Within the range of valence and size factors studied, it is found that the binding energy is generally small and depends primarily on the valence rather than the size, whereas the migration energy shows larger increases with both valence and size factors. Contributions from the lattice relaxation energies are important, particularly for impurity migration. The results can account satisfactorily for the experimental data of nontransition-metal impurities, but less so for the noble-metal impurities. Dielectric screening of the ion by the conduction electrons is important in determining the potential and must be properly accounted for in calculations of the energetics for impurities. View full abstract»

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  • Steady Solution for Circumferentially Moving Loads on Cylindrical Shells

    Publication Year: 1974 , Page(s): 395 - 400
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (407 KB)  

    The steady, forced-wave solution is obtained for loads that travel with constant speed on a simply supported circular shell, the motion of which is damped externally by air. Critical speeds are identified above which the waveform, which is a standing wave in moving coordinates, exhibits shorter wavelengths in front of the load than behind it. At supercritical speeds the solution becomes unbounded, because of loss of stability, in the limit of no damping. View full abstract»

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  • Equivalence of Memory to “Random Logic”

    Publication Year: 1974 , Page(s): 401 - 407
    Cited by:  Papers (16)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    A model of the design process for computer logic is used to estimate the number of bits of memory required to replace a so-called “random logic” circuit. The model can also be used to compare the respective time delays of array logic and random logic. View full abstract»

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  • String Path Search Procedures for Data Base Systems

    Publication Year: 1974 , Page(s): 408 - 422
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1867 KB)  

    This paper structures algorithms for the translation of set theoretic queries into procedures for the search of arbitrary complex networks constructed on a data base using three basic types of strings. A method for parameterization of queries which is appropriate for accessing string structures is outlined and it is shown how the properties of string structures can be used to construct an algorithm for finding a search path with minimum path cardinality for a given query addressed to such a network. (The term data management system is used instead of data base management system.) View full abstract»

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  • Analysis of Exception Data in a Staging Hierarchy

    Publication Year: 1974 , Page(s): 423 - 435
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (985 KB)  

    This paper is an analysis of program address trace data in a demand-paged computer system with a three-level staging hierarchy. Our primary objective is to explore the data both graphically and numerically, using methods that may be useful when other data traces become available. In addition, plausible point-process type models are fit to the data. Such an approach, combining data-analytic procedures with probability modeling, should prove useful in understanding program behavior and thus will aid in the rational design of complex computer systems. View full abstract»

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  • Structure Dependence of Free-Charge Transfer in Charge-coupled Devices

    Publication Year: 1974 , Page(s): 436 - 442
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (598 KB)  

    A detailed numerical analysis of charge-coupled-device (CCD) charge transfer is described and discussed. The analysis is based on solving the transport equation with a time-dependent surface field calculated from the actual device configuration. Devices with different oxide thicknesses and devices with electrode gaps are examined. The total field is found to play an important role in charge transfer for all cases studied. The effective channel length is modulated by the net field present and is a function of time and electrode configuration. The transfer is found fastest and the effective channel length shortest when the charge is transferred from a region of low oxide capacitance into a region of high oxide capacitance. A low-capacitance electrode gap slows the charge transfer process. View full abstract»

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  • MINI: A Heuristic Approach for Logic Minimization

    Publication Year: 1974 , Page(s): 443 - 458
    Cited by:  Papers (137)  |  Patents (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1949 KB)  

    MINI is a heuristic logic minimization technique for many-variable problems. It accepts as input a Boolean logic specification expressed as an input-output table, thus avoiding a long list of minterms. It seeks a minimal implicant solution, without generating all prime implicants, which can be converted to prime implicants if desired. New and effective subprocesses, such as expanding, reshaping, and removing redundancy from cubes, are iterated until there is no further reduction in the solution. The process is general in that it can minimize both conventional logic and logic functions of multi-valued variables. View full abstract»

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  • Generating Test Examples for Heuristic Boolean Minimization

    Publication Year: 1974 , Page(s): 459 - 464
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (566 KB)  

    This article describes simple methods of generating many-variable test-case problems for heuristic logic minimization studies. Covering problems and coloring problems are converted into Boolean functions that are useful test cases for minimization. View full abstract»

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  • Errata [Addendum to “Loss of Point-to-Point Traffic in Three-State Circuit Switches”]

    Publication Year: 1974 , Page(s): 465
    Save to Project icon | PDF file iconPDF (218 KB)  
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  • Recent papers by IBM authors

    Publication Year: 1974 , Page(s): 466 - 469
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (500 KB)  

    Reprints of the papers listed here can usually be obtained by writing directly to the authors. The authors' IBM divisions are identified as follows: ASDD is the Advanced Systems Development Division; DPD, 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; SDD, System Development Division: SPD, System Products Division; and WTC, World Trade Corporation. Papers are listed alphabetically by name of journal. View full abstract»

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  • Recent IBM patents

    Publication Year: 1974 , Page(s): 470 - 472
    Save to Project icon | PDF file iconPDF (402 KB)  
    Freely Available from IEEE
  • Authors

    Publication Year: 1974 , Page(s): 473 - 475
    Save to Project icon | PDF file iconPDF (344 KB)  
    Freely Available from IEEE
  • Contents of previous issues

    Publication Year: 1974 , Page(s): 476 - 477
    Save to Project icon | PDF file iconPDF (214 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.

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