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Proceedings of the IEEE

Issue 10 • Date Oct. 1982

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Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Publication Year: 1982 , Page(s): c1
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  • Scanning the issue

    Publication Year: 1982 , Page(s): 1139
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  • A unified switching theory with applications to VLSI design

    Publication Year: 1982 , Page(s): 1140 - 1151
    Cited by:  Papers (46)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1140 KB)  

    Classical switching theory is shown to have deficiencies when applied to the analysis and design of MOS VLSI circuits. A new logic design methodology called CSA theory is described here which overcomes many of these deficiencies. It is based on three primitive component types: connectors that perform wired-logic operations, switches representing controlled connectors, and attenuators representing resistive load devices. Four basic types of logic values are recognized: Boolean 0 and 1 values, unknown or indeterminate U values, and the high-impedance state Z. The number of logic values can be increased systematically to improve modeling accuracy using a concept of logical strength, which corresponds to current drive capability in analog circuits. It is shown that both the behavior and layout of most types of MOS logic circuits, including contact, gate, and nonclassical mixed circuits, can be treated in a uniform and rigorous manner using CSA network models with either four or seven logic values. The use of a digital charge-storage element called a well to represent sequential behavior is examined. CSA theory is applied to two VLSI design issues, inverter synthesis and fault simulation. View full abstract»

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  • Fourier transform nuclear magnetic resonance tomographic imaging

    Publication Year: 1982 , Page(s): 1152 - 1173
    Cited by:  Papers (22)  |  Patents (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7922 KB)  

    Nuclear Magnetic Resonance (NMR) tomographic imaging is a newly emerging, noninvasive, three-dimensional (3-D) imaging technique. Although similar to the well known X-ray Computerized Tomography (X-CT), it uses magnetic fields and RF signals to obtain anatomical information about the human body as cross-sectional images in any desired direction, and can easily discriminate between healthy and abnormal tissues. This new technique is an interdisciplinary science which encompasses the latest technologies in electrical, electronics, computers, physics, chemistry, mathematics, and medical sciences. Principles of this new technique known as "Fourier transform nuclear magnetic resonance imaging" or simply "NMR imaging" are reviewed from the physics and engineering points of view to provide basic concepts and tools, which, hopefully, will be useful for the future development of this exciting new field. Along with the review of the basic principles and methods involved in NMR tomography, computer simulations and modelings are presented to clarify the complexity of the NMR imaging method and provide an insight into the method, especially image-formation aspects and processing, the central theme of NMR tomography. In this paper, four main types of imaging methods-namely, line-scan imaging, direct Fourier-transform (Kumar-Welti-Ernst method) imaging, line-integral projection reconstruction, and plane-integral projection reconstruction, as well as the possibility of relaxation time imaging, are discussed in detail Methods of improving performance with respect to the statistical aspects of image quality and imaging times are also discussed. View full abstract»

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  • Spaceborne synthetic-aperture imaging radars: Applications, techniques, and technology

    Publication Year: 1982 , Page(s): 1174 - 1209
    Cited by:  Papers (46)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (14102 KB)  

    In the last four years, the first two Earth-orbiting, space-borne, synthetic-aperture imaging radars (SAR) were successfully developed and operated. This was a major achievement in the development of spaceborne radar sensors and ground processors. The data acquired with these sensors extended the capability of Earth resources and ocean-surface observation into a new region of the electromagnetic spectrum. This paper is a review of the different aspects of spaceborne imaging radars. It includes a review of: 1) the unique characteristics of space-borne SAR systems; 2) the state of the art in spaceborne SAR hardware and SAR optical and digital processors; 3) the different data-handling techniques; and 4) the different applications of spaceborne SAR data. View full abstract»

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  • Time-domain steady-state analysis of nonlinear electrical systems

    Publication Year: 1982 , Page(s): 1210 - 1228
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2043 KB)  

    Time-domain steady-state analysis is based on an algebraic objective function obtained by numerical integration of a system of ordinary differential equations and a method for computing the zero or the fixed point of the objective function. This paper reviews the most important aspects of time-domain steady-state analysis. First, the formulation of network equations is discussed and properties of importance for steady-state analysis-smoothness and stability of the solution of the differential equations-are reviewed. A selection of objective functions is presented, and the properties of these functions are derived from the results on network equations. The objective functions are computed chiefly by numerical integration of the network equations, and since this is the computationally most expensive part of a steady-state analysis, the next section is devoted to the discussion of efficient integration methods specially suited for steady-state problems. The section concentrates on both classical backward-differentiation formulas and variants with improved stability and accuracy properties. The methods for solving the algebraic objective equations are traditionally termed quick steady-state methods. This paper considers Newton iteration, quasi-Newton optimization, and extrapolation. Because of the framework established in the previous sections, these methods can be dealt with in a fairly uniform manner, thus emphasizing the methods as algorithms for computing zeros or fixed points of algebraic objective functions. Finally, the methods are compared for rate of convergence, computational efficiency, and storage requirements. View full abstract»

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  • Inverted microstrip and suspended microstrip with anisotropic substrates

    Publication Year: 1982 , Page(s): 1230 - 1231
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (178 KB)  

    This letter presents characteristics of the inverted microstrip and the suspended microstrip, with anisotropic substrates. The transverse transmission-line method combined with the mapping method and the variational technique in the space domain are used to analyze the impedance characteristics. The data presented should find application in the design of MIC components at millimeter-wave frequencies. View full abstract»

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  • Absolute stability criterion for a class of nonlinear systems with slope-restricted nonlinearity

    Publication Year: 1982 , Page(s): 1232 - 1233
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (165 KB)  

    Using Lyapunov's direct method, a stability inequality in frequency domain which incorporates the slope information of the nonlinearity is derived for a class of nonlinear feedback systems. The present Lyapunov function contains an integral involving the slope of the nonlinearity, i.e., unlike the conventional Lure-type Lyapunov function. View full abstract»

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  • On a dissimilarity of polynomial derivatives of single- and multivariable positive real functions

    Publication Year: 1982 , Page(s): 1233 - 1234
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    This letter establishes that the polynomial derivatives of a positive real function cannot be a reactance function in the cage of a single variable, Whereas this is possible in the case of multivariable positive real functions. View full abstract»

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  • System reduction using stability-equation method and modified Cauer continued fraction

    Publication Year: 1982 , Page(s): 1234 - 1236
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    An algorithm is proposed for obtaining stable reduced-order models using the combined advantages of the stability-equation method and the modified Cauer continued fraction. The reduction procedure is simple and computer oriented. View full abstract»

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  • A new microprocessor interfacing hardware for SCR triggering

    Publication Year: 1982 , Page(s): 1236 - 1237
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (190 KB)  

    In this letter a new hardware-oriented microporcessor (µP) based interface circuit is presented for controlling the SCR converters. The interface synchronizes the real-time input with the µP output. This method can be used for controlling the firing angle of the SCR's in the complete converter range. View full abstract»

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  • Correction to "The Josephson technology"

    Publication Year: 1982 , Page(s): 1238
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  • Conditional run-length coding for multilevel graphic image

    Publication Year: 1982 , Page(s): 1238 - 1240
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (290 KB)  

    The concept of conditional run-length coding mainly used for bilevel image is extended for multilevel graphic image. It is shown that the extended coding algorithm is also optimum for the Markov model. Its performance is compared with bit-plane coding and cosine transform coding. View full abstract»

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  • Corrections to "Spectrum analysis—A modern perspective"

    Publication Year: 1982 , Page(s): 1238
    Cited by:  Patents (2)
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  • On a recursive A/D conversion technique

    Publication Year: 1982 , Page(s): 1240 - 1241
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    This letter focuses on a recursive method proposed by the author several years ago and now suitable for a system-level IC implementation. Some comments referring to the flexibility and operability of such a class of devices are also reported. View full abstract»

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  • Expanded set of Robertson's detection characteristics

    Publication Year: 1982 , Page(s): 1240
    Cited by:  Papers (2)
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    Since it appears that the availability of expanded sets of these curves is not generally known, a brief description is given, with information on how to obtain copies. View full abstract»

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  • Minimality of SISO linear systems

    Publication Year: 1982 , Page(s): 1241 - 1242
    Cited by:  Papers (13)
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    A new test for minimality of single-input single-output state-space realizations is proposed based on rank conditions of a cross-Gramian type matrix without computing the controllability and observability Gramian matrices. View full abstract»

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  • Radical-pattern-based Chinese character synthesis

    Publication Year: 1982 , Page(s): 1242 - 1244
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (633 KB)  

    A scheme for the synthesis of Chinese characters from a set of basic radical patterns is described. Each stored radical pattern is encoded to allow a microprocessor to determine and execute the appropriate position shifting and size reduction of the radical patterns forming a particular character. The scheme reduces the use of manually entered shifting and reduction operations to a minimum. View full abstract»

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  • A new algorithm for power system state estimation

    Publication Year: 1982 , Page(s): 1244 - 1245
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    A new algorithm to estimate the state of a power system is presented. It completely overcomes the convergence problems associated with the WLS algorithm and has excellent convergence properties. It leads to an estimate which is very close to the true value of the state vector. View full abstract»

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  • Correction to "A comparison of semiconductor devices for high-speed logic"

    Publication Year: 1982 , Page(s): 1244
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  • Optical fiber transmission systems

    Publication Year: 1982 , Page(s): 1245 - 1246
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  • Apple II user's guide

    Publication Year: 1982 , Page(s): 1246 - 1247
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  • Digital communications: Microwave applications

    Publication Year: 1982 , Page(s): 1246
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  • Management information systems and organizational behavior

    Publication Year: 1982 , Page(s): 1246
    Cited by:  Papers (1)
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  • Book alert

    Publication Year: 1982 , Page(s): 1247 - 1248
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H. Joel Trussell
North Carolina State University