Due to its advantages, such as shock resistance, low power consumption, and so on, solid state drives are considered as a next generation storage device. And write amplification is a very import system parameter for evaluating performance. To simplify the analytical model of write amplification for solid state drives adopting page-level address translation mechanism, this paper proposes a probability model. Furthermore, numerical results based on our proposed probability model are also obtained. This paper can pose as a guideline for a first-order estimation of the write amplification for parameter ranges in solid state drives taking page mapping scheme.
We describe a microelectromechanical systemsbased actuator for three-dimensional (3D) positioning of a polymer microlens implemented using silicon-on-glass technology. The actuator combines comb drives for lateral tracking with electrostatic parallel plates for out-of-plane focusing as well as tilting of a polymer microlens, yielding fully 3D actuation. The complete actuator is fabricated using wafer bonding of silicon and pyrex wafers; the lens is integrated using polymer dispensing techniques. The 3 DOF positioning of the lens for focusing, tracking, and tilting are experimentally characterized, furthermore, the layout and symmetry would allow 4 DOF movement, demonstrating how this actuation system combined with an integrated lens may be particularly useful for new generations of optical pickups.[2013-0036]
This paper reports on a Joule-level multi-pass laser amplification device with diode end-pumped square-rod neodymium glass (Nd:glass) bonded to K9 glass. The device generated 1.17 J pulse energy at 1 Hz and 1053 nm. The optical-to-optical efficiency was 13.01%, and the effective energy extraction efficiency was 44.23%. Comparing Nd:glass of the same specification without K9 glass under the same conditions, the thermal wave aberration of the former was 85.71% of that of the latter, which is 0.78 um. The near-field modulation degree at the highest energy output was 1.42 within 90% of the spot, and the far-field energy concentration was 81.88% within the 2.5-fold diffraction limit. The Nd:glass bonding method of the square rod is relatively novel in laser amplification systems pumped by the diode end face and can be further studied in future works.
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