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  • 1990-1994  (3)
  • 57Q45  (1)
  • Time  (1)
  • echocardiography  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Optimal tradeoffs for addition on systolic arrays (1991)
    Springer
    Algorithmica 6 (1991), S. 49-71 
    Details
    ISSN: 1432-0541
    Keywords: Addition ; Area ; Time ; VLSI circuits ; Input/output ports ; Boundary layouts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The complexity of adding twon-bit numbers on a two-dimensional systolic array is investigated. We consider different constraints on the systolic array, including: whether or not the input and output ports lie on the periphery of the array, constraints placed on the arrival and departure times of inputs and outputs . For all combinations of the above constraints, we obtain optimal tradeoffs among the resources of area, pipeline delay, and worst-case time. It turns out that there is a subtle interplay among the constraints and some of our results seem counterintuitive. For instance, we show that allowing more-significant bits to arrive earlier than less-significant bits can speed up addition by a factor of logn. We also show that multiplexing can often result in a smaller array. On the other hand, we show that some known results, such as Chazelle and Monier's bounds for arrays that have input/output ports on the perimeter, also hold in less constrained models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01759034
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Syzygies among elementary string interactions in 2+1 dimensions (1991)
    Springer
    Letters in mathematical physics 23 (1991), S. 287-300 
    Details
    ISSN: 1573-0530
    Keywords: 57Q45
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The elementary string interactions are the Reidemeister moves, birth/death, and fusion/fission. Such interactions have as their trace generically mapped surfaces, and these combine to form knotted surfaces in 4-space. The syzygies among these interactions are moves to such surfaces analogous to the Reidemeister moves for knots. ‘Movie’ parametrizations of these syzygies are given and interpreted in dimension 2+2. A Morse theoretic argument shows there are 15 such movie moves. These moves, with appropriate choices of crossing information, are sufficient to construct any isotopy of an embedded surface on which a height function has been specified. The first seven of the movie moves are parametrized versions of those given by Roseman. The remaining eight are moves of Δ-type. Amplitudes assigned to these interactions must satisfy relations that correspond to the movie moves. One such relation is a Zamolodchikov tetrahedral equation. We present some puzzles about the matrix formulations of these amplitudes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398826
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A clinical computer database entry form for an intraoperative anesthesiology-based transesophageal echocardiography monitoring service (1993)
    Springer
    Journal of clinical monitoring and computing 10 (1993), S. 235-245 
    Details
    ISSN: 1573-2614
    Keywords: database ; entry form ; transesophageal ; echocardiography ; intraoperative
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Medicine
    Notes: Abstract Transesophageal echocardiography (TEE) has been increasingly applied to supplement and, in instances, to supplant conventional intraoperative cardiac monitoring. Our body of experience (〉1600 intraoperative TEE procedures), combined with insights gleaned from an intramural quality assurance study, and clinical implications of certain recent advances in the field, led us to develop the following TEE computer database entry form. The form, completed intraoperatively, consists of a patient and surgical procedure demographics section, followed by fields based on the TEE examination. The scans encompass transverse plane basal short axis, long axis, and transgastric views of the heart and great vessels. The two-dimensional echocardiographic, saline-contrast, color flow and pulsed Doppler data represent both right and left ventricular performance, valvular function and specific lesions. This database entry form is intended to serve as a guide for performance of a nominally complete intraoperative study and facilitate maintenance of a TEE archive consistent with current advances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133014
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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