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IBM Journal of Research and Development

Issue 1 • Date Jan. 1974

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Displaying Results 1 - 12 of 12
  • On-line Measurement of Paging Behavior by the Multivalued MIN Algorithm

    Page(s): 2 - 19
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1671 KB)  

    An algorithm is presented that extracts the sequence of minimum memory capacities (MMCs) from the sequence of page references generated by a program as it is executed in a demand paging environment. The new algorithm combines the advantages of existing approaches in that the MMC's are produced in a single pass, as is the output of the MIN algorithm for a single memory size, and the MMC sequence is identical to the optimum stack distances provided by the OPT algorithm, which requires two passes. A hardware implementation is outlined as an extension to existing page management mechanisms. The resulting device could be used to produce continuously the MMC information, while the (paging) machine executes the program at essentially full speed. The paper also discusses the possible impact of the algorithm on the study of program behavior and on the development of space sharing (paging) algorithms. Finally, a proof is provided that the algorithm in fact produces an output identical to that of OPT. View full abstract»

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  • Register Assignment Algorithm for Generation of Highly Optimized Object Code

    Page(s): 20 - 39
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2103 KB)  

    A register assignment algorithm is described that, in contrast to traditional methods, permits a high level of optimization at both local and global levels. This involves splitting local register optimization into two phases, with global assignment intervening. Because novel techniques are used in the global assignment procedure, it is described in detail. Experimental results with a prototype implementation are presented in which object code improvements on the order of 25 percent over a production optimizing compiler were obtained. No attempt was made to assess manpower costs of a final implementation nor to weight them against expected improvements in generated code. View full abstract»

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  • Water Vapor as an Oxidant in BBr3 Open-tube Silicon Diffusion Systems

    Page(s): 40 - 46
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (738 KB)  

    The use of water vapor as an oxidant in place of oxygen enables a wide range of surface concentrations to be obtained in a single-step process. The concentration of boron at the silicon surface is found not to be constant throughout the diffusion process because, at the temperature used, the oxide growth is not parabolic. View full abstract»

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  • Potential Distribution of an Inhomogeneously Doped MIS Array

    Page(s): 47 - 52
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (667 KB)  

    A numerical method is used to obtain the potential distribution of a two-dimensional, inhomogeneously doped MIS array under pulse voltage operation. The effects of interface charge and of impurity doping and its locations on the surface potential profile are presented. The technique is useful for designing an appropriate surface potential profile for ion-implanted charge-coupled devices. View full abstract»

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  • Numerical Calculation of Normal Modes for Underwater Sound Propagation

    Page(s): 53 - 58
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (597 KB)  

    Hartree's method for calculation of atomic wave functions is applied to the Schroedinger-like normal mode equation for underwater sound propagation. Rapid convergence was obtained for the twelve normal modes at five Hertz with a typical velocity profile. The normal modes are given, along with an example of the pressure field, and a means for numerical calculation of the near field modes is suggested. View full abstract»

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  • Stability Criterion for Recursive Filters

    Page(s): 59 - 71
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1395 KB)  

    A new criterion is derived that relates the stability of two-dimensional recursive filters to the properties of its cepstrum. It provides a procedure for the decomposition of unstable recursive filters having nonzero, nonimaginary frequency response into stable recursive filters. The optimal solution of the decomposition problem is discussed, including numerical implementation and nonrecursive solutions. Several numerical examples show the potentialities and limitations of the rules for decomposition and for truncation of the operators. View full abstract»

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  • Economic Order and Surplus Quantities Model

    Page(s): 72 - 75
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (486 KB)  

    A standard mathematical model for inventory management is known as the Economic Order Quantity (EOQ) model. In this communication the EOQ model is extended to include the possibility of determining how much, if any, excess stock should be sold at the beginning of a decision period. The new model is of practical importance for situations in which a formal inventory management system is to be instituted while substantial inventories exist or when changes in demand, ordering costs, or carrying and interest charges require recomputation of the economic order quantity. View full abstract»

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  • Preparation of Large-area Electron-transparent Samples from Silicon Devices

    Page(s): 76 - 79
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (930 KB)  

    A technique using a pulsating chemical jet has been developed for thinning and polishing large areas (750 to 1000 µm in diameter) of silicon devices. The thickness can be reduced to a few micrometers. This technique has been used to prepare bipolar and FET samples for transmission electron microscopy. Physical characterization of more than twenty devices can be achieved by one sample preparation. View full abstract»

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  • Recent papers by IBM authors

    Page(s): 80 - 84
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (580 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, Ofice 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

    Page(s): 85 - 87
    Save to Project icon | PDF file iconPDF (434 KB)  
    Freely Available from IEEE
  • Authors

    Page(s): 88 - 89
    Save to Project icon | PDF file iconPDF (322 KB)  
    Freely Available from IEEE
  • Contents of previous issues

    Page(s): 90 - 92
    Save to Project icon | PDF file iconPDF (254 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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Meet Our Editors

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