Today large amounts of data are stored on tertiary storage media such as magnetic tapes and optical disks. DBMSs typically operate only on magnetic disks since they know how to maneuver disks and how to optimize accesses on them. Tertiary devices present a problem for DBMSs since these devices have dismountable media and have very diier-ent operational characteristics compared to magnetic disks...

A disk Wang-Bézier type generalized Ball curve is a Wang-Bézier type generalized Ball curve whose control points are disks in a plane. It can be viewed as a parametric curve with error tolerances. In this paper, we discuss the problem of degree reduction of disk Wang-Bézier type generalized Ball curve, that is, bounding disk Wang-Bézier type generalized Ball curves with lower degree disk Wa...

Abstract We consider three corrections to the disk sizes estimated at a given frequency using accretion models. They are due color correction, truncation an inner radius larger than innermost stable circular orbit, and winds, which we apply standard model. our results estimates of based on microlensing. find that these effects combined can explain long-standing problem from microlensing being t...

In this paper energy method is used to calculate rotor response with loose rotating disk on it. System equation of motion is obtained based on energy method and Lagrange equation. Mathematical modeling of loose disk in a rotor bearing system has resulted in terms similar to unbalance and gyroscopic effect in the system equation of motion. The effect of loose disk axial position and orthotropic ...

Achieving data availability and reliability guarantees against disk failure using redundancy coding scheme. X-code is a double tolerant to achieve the optimal update complexity. It reduces the possibility of data unavailability when disk/node fails. X-code based optimal recovery scheme Minimum-disk-read-recovery (MDRR) and Group-based MDRR (GMDRR) minimizes the number of disk reads for a single...

Background & Aims: The production of extended-spectrum-β-lactamases (ESBLs) is the main mechanism of resistance to β-lactam antibiotics. The outbreak of isolates simultaneously possessing several resistance mechanisms to β-lactam antibiotics caused a decrease in sensitivity of the confirmatory tests for ESBL. The aim of this study was the evaluation of the β-lactamase disk test method in the de...

Power is a big problem in data centers and a significant fraction of this power is consumed by the storage system. Server storage systems use a large number of disks to achieve high performance, which increases their power consumption. In this thesis, we explore an architecture that can significantly reduce the power consumed by the storage system via intra-disk parallelism, wherein disk drives...