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Proceedings of the IEEE

Issue 6 • Date June 1988

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Displaying Results 1 - 10 of 10
  • Gyrotron oscillators

    Publication Year: 1988 , Page(s): 644 - 656
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2790 KB)  

    The history of gyrotron development, the principles of gyrotron operation, and possible ways to enhance the power level to increase the operating frequency of gyrotrons are outlined. The state of the art of gyrotrons, their present and possible applications, and perspectives on gyrotrons are considered.<> View full abstract»

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  • Lightning and the heart: fractal behavior in cardiac function

    Publication Year: 1988 , Page(s): 693 - 699
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (684 KB)  

    The basic concepts of fractals are briefly reviewed and are then shown to apply cardiac functions. It is demonstrated that some of the same principles govern both lightning discharge and cardiac flow; fractal expressions are provided for each. Fractal behavior in other biological phenomena, including transport (practical kinetics), population growth cycles, and turbulence, is touched on View full abstract»

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  • Cardiovascular responses to acceleration stress: a computer simulation

    Publication Year: 1988 , Page(s): 700 - 707
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (620 KB)  

    Engineering methodology was used to develop a mathematical model of the cardiovascular system which is capable of predicting the effects of acceleration stress on peripheral and central vision. The basic model, previously reported, has been extended to include a simulation of the venous system and a number of additional refinements. It includes simulations of the heart, arterial, and venous system... View full abstract»

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  • Three-dimensional computer model of electric fields in internal defibrillation

    Publication Year: 1988 , Page(s): 720 - 730
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (876 KB)  

    The automatic internal defibrillator delivers a low-energy shock directly to the heart. Optimal strategies for these shock deliveries are determined by studying a three-dimensional computer model of the electric fields produced by initial defibillation electrodes. A finite-element analysis technique is used to calculate energy and current density distributions in three commonly used electrode conf... View full abstract»

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  • Three-dimensional computer simulation of the cardiac system

    Publication Year: 1988 , Page(s): 708 - 719
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1052 KB)  

    An integrated approach to modeling the cardiac system is described and related to physiological measurements and other model approaches. The model is composed of a number of parts that will ultimately be used as a tool to study the various functions of the cardiac system. The 3-D geometry of the LV is reconstructed by using a helical coordinate system which provides a quantitative tool for shape d... View full abstract»

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  • Performance of the `smaller of' and `greater of' detectors integrating M pulses

    Publication Year: 1988 , Page(s): 731 - 733
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (180 KB)  

    In previous studies by V.G. Hansen (1973) and by Hansen and J.H. Sawyers (1980), performance models were developed for the smaller of (SO) and greater of (GO) constant false alarm rate (CFAR) detectors processing a single sweep (or single pulse). Here, performances of the SO and GO detectors are derived when M pulses are incoherently integrated in a homogeneous environment. This situation... View full abstract»

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  • Interference rejection techniques in spread spectrum communications

    Publication Year: 1988 , Page(s): 657 - 671
    Cited by:  Papers (256)  |  Patents (32)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1148 KB)  

    It is argued that the ability of a spread-spectrum system to withstand interference, both intentional and unintentional, is probably its greatest asset. Any spread spectrum receiver can only suppress a given amount of interference; if the level of interference becomes too great, the system will not function properly. Even under these latter circumstances, however, other techniques, which enhance t... View full abstract»

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  • Self-processing networks and their biomedical implications

    Publication Year: 1988 , Page(s): 680 - 692
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1300 KB)  

    Self-processing networks (connectionist models, neural networks, marker-passing systems, etc.) represent information as a network of interconnected nodes and process that information through the controlled spread of activation throughout the network. Properties characterized as manifestations of intelligence, such as associative recall of stored memories, pattern classification, and learning, are ... View full abstract»

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  • Refinement and extension of Belevitch's criterion through perturbation techniques

    Publication Year: 1988 , Page(s): 733 - 734
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (140 KB)  

    A nonredundant derivation of V. Belevitch's (1959) stability criterion for negative-conductance quasisinusoidal quasistatic oscillators is presented. The key stop step of the analysis is the definition of the asymptotic baseband impedance operator associated with the tank circuit of concern. An extension of the criterion to oscillators with both resistive and capacitive nonlinearity is provided View full abstract»

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  • The chronic disease data bank-the ARAMIS experience

    Publication Year: 1988 , Page(s): 672 - 679
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (680 KB)  

    The authors provide an overview of the American Rheumatism Association Medical Information System (ARAMIS), a national database and database management system containing parallel longitudinal clinical data sets from 17 rheumatic disease centers. 22 000 patients and 183000 observation time points are represented. The database contains measures of five dimensions-death, disability, discomfort, iatro... View full abstract»

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