Gaylord W. Richards

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We describe a new optoelectronic switching system demonstration that implements part of the distribution fabric for a large asynchronous transfer mode (ATM) switch. The system uses a single optoelectronic VLSI modulator-based switching chip with more than 4000 optical input-outputs. The optical system images the input fibers from a two-dimensional fiber(More)
Several different shuffle-equivalent interconnection topologies that can be used within the optical link stages of photonic-switching networks are studied. These schemes include the two shuffle, the two banyan, and the segmented two shuffle, which can be used to interconnect two-input, two-output switching nodes. The schemes also include the four shuffle(More)
Since Clos gave the first construction of a strictly nonblocking multistage interconnection network, only a few other constructions have been proposed in almost a half-century. In this paper, we introduce a constructive class of networks which utilizes crossbars of virtually any size and for which the sizes can vary from stage to stage. The interconnection(More)
BACKGROUND The objective of this study was to determine the neurophysiological effects of leflunomide on peripheral nerves in rheumatoid arthritis. METHODS We conducted a prospective cohort trial of 32 patients with rheumatoid arthritis with 16 patients receiving leflunomide treatment and 16 receiving other disease-modifying anti-rheumatic drug therapies.(More)
OBJECTIVE To present a case of acute adrenal insufficiency secondary to heparin-induced thrombocytopenia-thrombosis syndrome (HITTS), an important though rare complication of heparin therapy. CLINICAL FEATURES A 69-year-old woman developed HITTS secondary to low dose heparin administered subcutaneously as prophylaxis against deep venous thrombosis. This(More)
A new class of networks that is well suited for free-space photonic switching applications is described. These networks are known as extended generalized shuffle networks. It is shown that these networks can provide low blocking probabilities while requiring low hardware costs. In fact, if sufficient hardware is added to these networks, they become strictly(More)
This paper studies the architectural trade-offs found in a novel ATM packet switch that offers several benefits for applications based on free-space digital optics. The architecture is based on a banyan network, but it uses a combination of deflection routing and output buffering to solve the contention resolution problem. It also makes novel use of chutes(More)