This article focused on the stress analysis of an edge crack in a thin hallow rotating functionally graded material (FGM) disk. The disk is assumed to be isotropic with exponentially varying elastic modulus in the radial direction. A comprehensive study is carried out for various combinations of the crack length and orientation with the different gradation of materials. The effect of non-unifor...

Cut by a line the union of given disjoint disks in the plane so that both sides of the line contain many intact disks. At least how many intact disks can we leave in either side? It is proved that there is a family of infinitely many disjoint disks in the plane for which every line has a side that contains at most one intact disk. On the other hand, for any family of n disjoint disks, there is ...

We propose an incremental approach to compute the order-k maximum Voronoi diagram of disks in the plane. In our approach, we start with an order-k Voronoi diagram of disk centers and iteratively expand disks and update the changes of the diagram until all disks reach their targeted size. When disks expand continuously, the structure of the diagram changes discretely. The algorithm takes O (⌈ rm...

We have proposed an Autonomous Disks for the advanced data management. The Autonomous Disks provide data distribution and high reliability. The Autonomous Disks configure a cluster and handle access from host in the cluster. In this paper, we propose dynamic reconfiguration algorithms allowing the usual operations dulling the reconfiguration, and implement them on an experimental system using J...

With flash disks being an important alternative to conventional magnetic disks, various design aspects of DBMSs, whose I/O behavior is performance-critical, and especially their I/O architecture should be reconsidered. Taking the distinguished characteristics of flash disks into account, several flash-aware buffer algorithms have been proposed with focus on flash-specific performance optimizati...

Expanding upon the IRAC survey from Dahm and Hillenbrand (2007), we describe Spitzer IRAC and MIPS observations of the populous, 5 Myr-old open cluster NGC 2362. We analyze the mid-IR colors of cluster members and compared their spectral energy distributions to star+circumstellar disk models to constrain the disk morphologies and evolutionary states. Early/intermediate-type confirmed/candidate ...