Michael J. Flynn

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Many algorithms have been developed for implementing division in hardware. These algorithms di er in many aspects, including quotient convergence rate, fundamental hardware primitives, and mathematical formulations. This paper presents a taxonomy of division algorithms which classi es the algorithms based upon their hardware implementations and impact on(More)
PAM-Blox are object-oriented circuit generators on top of the PCI Pamette design environment, PamDC. Highperformance FPGA design for adaptive computing is simplified by using a hierarchy of optimized hardware objects described in C++. PAM-Blox consist of two major layers of abstraction. First, PamBlox are parameterizable simple elements such as counters and(More)
We explore the design space of Field Programmable Gate Arrays (FPGAs), Processors and ASICs – Hardware-Software Tri-design – in the framework of encryption for hand-held communication units. IDEA (International Data Encryption Algorithm) is used to show the tradeoffs for the suggested technologies. The measures for comparing different options are:(More)
IMPORTANCE Increased use of computed tomography (CT) in pediatrics raises concerns about cancer risk from exposure to ionizing radiation. OBJECTIVES To quantify trends in the use of CT in pediatrics and the associated radiation exposure and cancer risk. DESIGN Retrospective observational study. SETTING Seven US health care systems. PARTICIPANTS The(More)
Digital imaging provides an effective means to electronically acquire, archive, distribute, and view medical images. Medical imaging display stations are an integral part of these operations. Therefore, it is vitally important to assure that electronic display devices do not compromise image quality and ultimately patient care. The AAPM Task Group 18 (TG18)(More)
Floating-point division is generally regarded as a low frequency, high latency operation in typical floating-point applications. However, in the worst case, a high latency hardware floating-point divider can contribute an additional 0.50 CPI to a system executing SPECfp92 applications. This paper presents the system performance impact of floating-point(More)
This work uses a partially redundant number system as an internal format for floating point arithmetic operations. The redundant number system enables carry free arithmetic operations to improve performance. Conversion from the proposed internal format back to the standard IEEE format is done only when an operand is written to memory. A detailed discussion(More)
CONTEXT Use of diagnostic imaging has increased significantly within fee-for-service models of care. Little is known about patterns of imaging among members of integrated health care systems. OBJECTIVE To estimate trends in imaging utilization and associated radiation exposure among members of integrated health care systems. DESIGN, SETTING, AND(More)