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The purpose of this study is to determine a range of detection thresholds at which new dynamic spectrum access (DSA) devices can safely operate in unoccupied spectrum allocated to terrestrial television (TV) broadcasting and other services (i.e., the TV "white spaces"), without causing harmful interference to other authorized operations, which include digital and analog TV stations, wireless...
This paper describes the dynamic spectrum access radio system that was built as part of the DARPA XG program. The DSA system's architecture four principal components (the DSA engine; the environmental sensing (i.e., detection) subsystem; the communications (i.e., radio) subsystem; and a policy module/enforcer) are described. The DSA system's 802.16-based radio hardware is described. One of the field...
This paper investigates the performance of FFT- type feature TV detector of weak signals, which can be used in listen-before-talk (LBT) spectrum access algorithms. Using FFT plots applied to consecutive sets of measurements collected at multiple locations, we illustrate and characterize different types of spurious signal environments. Ultra sensitive TV detectors can significantly improve the overall...
Symptoms of pain and weakness are nearly ubiquitous after carpal tunnel release. This study investigates the length of time before restoration of grip and pinch strength after open carpal tunnel release, in a population of patients without workers' compensation-related injuries. Two different forms of carpal ligament reconstruction were carried out in 2 groups of patients, and a third group underwent...
A 74-year-old woman came, in July, 1994, to a general surgical ward with a 5-month history of lumbar pain and intermittent constipation. A computed tomogram (CT) scan suggested extensive carcinoma of the tail of the pancreas. She underwent a laparotomy, at which the tumour was found to involve the tail of the pancreas, spleen, left kidney, and a cuff of stomach. The tumour was resected; histology...
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