Mohammed G. Khatib

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Because of its small form factor, high capacity, and expected low cost, MEMS-based storage is a suitable storage technology for mobile systems. MEMS-based storage devices should also be energy efficient for deployment in mobile systems. The problem is that MEMS-based storage devices are mechanical, and thus consume a large amount of energy when idle.(More)
Activity of Renshaw cells evoked by electrical stimulation of either phrenic or internal intercostal axons was extracellularly recorded in anaesthetized spontaneously breathing cats. The response of all the studied units to antidromic invasion of the corresponding motoneurones was related to the respiratory cycle and some units displayed spontaneous(More)
Simultaneous recordings were made intracellularly from phrenic motoneurons (PMs) and extracellularly from their central drivers, the inspiratory bulbospinal neurons (IBSNs) of the dorsal respiratory nucleus. On the basis of their order of recruitment from the beginning of inspiration (as estimated by the phrenic discharge). PMs and IBSNs were classified as(More)
In anesthetized spontaneously breathing cats (C4-C5 deafferentation), recurrent inhibition of phrenic motoneurons was analyzed by studying either recurrent IPSPs in phrenic motoneurons, or Renshaw cell discharges evoked by C5 phrenic nerve stimulation. Of 90 intracellularly recorded phrenic motoneurons, 7 motoneurons showed evoked recurrent IPSPs with(More)
PURPOSE To compare intubating conditions and cardiovascular changes following induction of anesthesia and tracheal intubation in patients receiving either lidocaine-remifentanil-propofol or lidocaine-remifentanil-thiopental prior to induction. METHODS In a randomized, double-blind study 76 healthy adult patients were assigned to one of two groups:(More)
In computer systems, the storage hierarchy, composed of a disk drive and a DRAM, is responsible for a large portion of the total energy consumed. This work studies the energy merit of interposing flash memory as a streaming buffer between the disk drive and the DRAM. Doing so, we extend the spin-off period of the disk drive and cut down on the DRAM capacity(More)
Because of its small form factor, high capacity, and expected low cost, MEMS-based storage is a suitable storage technology for mobile systems. However, flash memory may outperform MEMS-based storage in terms of performance, and energy-efficiency. The problem is that MEMS-based storage devices have a large number (i.e., thousands) of heads, and to deliver(More)
MEMS-based storage devices should be energy efficient for deployment in mobile systems. Since MEMS-based storage devices have a moving media sled, they should be shut down during periods of inactivity. However, shutdown costs energy, limiting the applicability of aggressive shutdown decisions. The media sled in MEMS-based storage devices is suspended by(More)
The disk and the DRAM in a typical mobile system consume a significant fraction (up to 30%) of the total system energy. To save on storage energy, the DRAM should be small and the disk should be spun down for long periods of time. We show that this can be achieved for predominantly streaming work-loads by connecting the disk to the DRAM via a large(More)
Phase Change Memory (PCM) is emerging as an attractive alternative to Dynamic Random Access Memory (DRAM) in building data-intensive computing systems. PCM offers read/write performance asymmetry that makes it necessary to revisit the design of in-memory applications. In this paper, we focus on in-memory hash tables, a family of data structures with wide(More)