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Proceedings of the IEEE

Issue 4 • Date Apr 1993

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Displaying Results 1 - 9 of 9
  • The emerging role of flexible media

    Publication Year: 1993 , Page(s): 595 - 606
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1060 KB)  

    The evolution of systems that use flexible magnetic media for data storage is reviewed. The exponential increases in performance of these systems has imposed continually changing requirements upon the media. Because of the great diversity in the market requirements for tape systems, developments are addressed by market segments, the corresponding advances in magnetic tape design and manufacture are examined. The design of tapes to simultaneously optimize electromagnetic, mechanical, and tribological performance, and the key design parameters for these properties, are discussed View full abstract»

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  • Strained layer heterostructures, and their applications to MODFETs, HBTs, and lasers

    Publication Year: 1993 , Page(s): 493 - 556
    Cited by:  Papers (6)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5728 KB)  

    Recent developments in strained layer epitaxial systems are reviewed. Their interest stems primarily from the additional degree of freedom that strained layers provide in the design of heterostructures and devices, which has led to device structures that can be tailored to a particular application with, in many cases, performances that are and out of reach with lattice-matched systems alone. With the advent of SiGe alloys, the concept of strained layers was extended to include the elemental semiconductors as well. Si/SiGe heterojunctions have provided a way to study quantum phenomena and explore heterojunction bipolar transistors (HBTs) and field-effect transistors (FETs). In optoelectronics, quantum well lasers with strained InGaAs active layers provide considerable reduced threshold current density. With coherently strained active layers based on GaAs, lasers with longevities superior to those with lattice-matched channels have been obtained View full abstract»

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  • The emerging paradigm shift in storage system architectures

    Publication Year: 1993 , Page(s): 607 - 620
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1396 KB)  

    It is argued that currently dominant, large-scale storage architectures, built around central, shared storage systems with CPU-connected devices, are reaching economic and technological limitations and no longer meet performance, capacity, and transparency requirements. Models of historical scientific and technological paradigm shifts are reviewed, and the reasons why the authors believe such a paradigm shift is underway in storage system architectures are discussed. The requirements to be met, important technical problems being investigated, such as network-connected devices, use of storage hierarchies, and system management, and the characteristics of the emerging large-scale, distributed, storage-architecture paradigm are described and illustrated by actual implementations and by standardization work under way in the IEEE Storage System Standards Working Group View full abstract»

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  • Comments with reply, on `Pulse propagation in a linear, causally dispersive medium' by K.E. Oughstun

    Publication Year: 1993 , Page(s): 631 - 639
    Cited by:  Papers (3)
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    The commenters describe two numerical methods for calculating quantitative results for short pulse propagation in dispersive media calculated using an asymptotic method in the above-titled paper (see ibid., vol.79, no.10, p.1379-1390, 1991). The author replies that unbeknownst to them, the commenters have provided an independent verification of the complete accuracy of the description of ultrashort pulse propagation in a linear, causally dispersive medium that is afforded by the modern asymptotic theory View full abstract»

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  • The changing nature of disk controllers

    Publication Year: 1993 , Page(s): 586 - 594
    Cited by:  Papers (1)  |  Patents (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB)  

    The evolution of the disk controllers that interface disk drive storage devices and subsystems with their hosts is reviewed. With magnetic disk storage density increasing by over five orders of magnitude in 37 years, the nature of the controller and its functions has undergone a significant change. In the 1960s, introduction of the IBM 360 and 370 systems led to architectures oriented to mainframe systems. In the 1980s, the personal computer brought into being the single-board controller most frequently attached to a single hard disk drive. In the 1990s, the functions that are being included within the drive are radically changing the attachment of a drive to a system View full abstract»

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  • MaSSIVE: the Mass Storage System IV Enterprise

    Publication Year: 1993 , Page(s): 621 - 630
    Cited by:  Papers (3)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (932 KB)  

    The Mass Storage System IV Enterprise (MaSSIVE) a fourth-generation mass storage system that provides a file system service to teraflops computing systems, is described. A bitfile managed by MaSSIVE can be a complete, self-contained Unix file system specific to a particular MaSSIVE client. MaSSIVE will stage whole file systems from archival storage onto online storage devices and then provide its clients with raw block access to the staged file systems. It will comply with the IEEE Mass Storage System Reference Model, and will consist of cooperating processes distributed across a network of supermicrocomputers. The client interface to a file system will be implemented through a custom device driver that will permit I/O to MaSSIVE online storage drives. The device interface through a high-bandwidth data fabric to the storage device will use common device-controller-specific protocols. As file systems are unmounted by clients or clients disconnect from the data fabric, file systems can be migrated back to archive storage and removed from online storage View full abstract»

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  • Ernst Weber: bridger of cultures

    Publication Year: 1993 , Page(s): 558 - 568
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    The accomplishments of Ernst Weber, who was born in 1901 in Vienna, are discussed. Weber earned doctorates in both physics and electrical engineering and worked as an engineer for Siemens-Schuckert before moving to the United States in 1930. For the next 27 years he taught and did research at Polytechnic Institute of Brooklyn. There he built up an outstanding graduate program and made important contributions to microwave research. In 1957 he became President of Polytechnic, and in 1963 he served as the first president of the newly formed Institute of Electrical and Electronics Engineers (IEEE). After his retirement in 1969 from Polytechnic, he worked nine years for the National Research Council. Throughout his career Weber worked to build bridges between different cultures: between European electrical engineering and American electrical engineering, between industry and academia, between engineering and physics, and between the American Institute of Electrical Engineers and the Institute of Radio Engineers, when they merged to become the IEEE View full abstract»

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  • Comments, with reply, on `Planetary influences on electrical engineering' by R.N. Bracewell

    Publication Year: 1993
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    The commenter adds an example of the influence of astronomy on electrical engineering to those that appear in the above-titled paper (see ibid., vol.80, no.2, p.230-237, 1992). He points out that except for a factor of approximately 10, Bode's law of planetary orbit radii is quite similar to Bessel function radial units of first-order cylinder functions of the first kind, such as appear in harmonic microwave cavities used in electrical engineering. In his reply, the author presents another example of an electrical topic with roots in astronomy: the problem of determining dynamical stability by examining the differential equation of the motion, a basic part of modern stability and control theory in the electrical engineering curriculum that was first attacked by Isaac Newton in connection with the stability of planetary orbits View full abstract»

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  • DASD trends: cost, performance, and form factor

    Publication Year: 1993 , Page(s): 573 - 585
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1124 KB)  

    By examining trends in disk technology, performance, reliability, and price and comparing those trends to those of competing technologies, the authors conclude that magnetic disks will be useful for the foreseeable future. Key to the survival of magnetic disks is the use of low-cost logic and memory to enhance the performance and function of the disk subsystem, and rapid adaptation of disk technology to the changing requirements for storage View full abstract»

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H. Joel Trussell
North Carolina State University