Samsung Electronics Co., Ltd.

Yonsei University

Sung-Bong Yang

Kyoung-woo Lee

Dae-kyu Shin

Kwang-Cheol Choi

Shin-Jun Lee

Tack-don Han

Shin-Dug Kim

Suk Kyu Chang

Yun-Sik Kang

A ray tracing method and apparatus in a 3-Dimensional (3D) image system. The method includes sampling for four vertexes of each pixel in a plurality of pixels, sampling for a pivot of the each pixel, and determining a color of the each pixel using the sampling result on the four vertexes and the pivot.

Method and apparatus for ray tracing in a 3-dimensional image system

A method for storing parity and rebuilding the data contents of two failed disks in an external storage subsystem comprises the steps of: proving a disk array defined as a matrix of (N-1).sup.* N including N disks each logically divided into N-1 data blocks where N is a prime number, the data blocks of a row being defined as a horizontal parity group, the data blocks existing in a rightwardly and upwardly continuous diagonal line being defined as a diagonal parity group; defining the data blocks existing in the diagonal line leftwardly and downwardly from the first data block of the (N-1) disk to the last data block of the first disk as horizontal parity blocks; defining the data blocks existing in the (N-1) row of the matrix as diagonal parity blocks; exclusive OR'ing (XORing) the contents of each of the horizontal and diagonal parity groups to obtain the parity value stored into the parity block of the corresponding horizontal or diagonal parity group; and analyzing a diagonal parity group including an error data block of the two failed disks to restore the error data block and then, the horizontal parity group including the restored error data block to restore another error data block, wherein the last analyzing step is repeated to completely rebuild the data contents of the two failed disks.

Method for storing parity and rebuilding data contents of failed disks

Growing community of inventors

Seoul, South Korea

Sung-Bong Yang