A (k, n) secret image sharing method shares a protected image in n shared images and the protected image can be reconstructed by k shared images. This study solves the secret image sharing problem by a geometry secret sharing strategy named the Blakley scheme. The protected image is first partitioned into non-overlapping sets of k pixels. Each set of k pixels forms a point under a k-dimensional...

microdeletion syndromes are contiguous gene deletion syndromes of less than 5 megabases.  most often, many of these syndromes are not detectable by  routine chromosomal analysis and require more specific testing techniques such as fish or more accurate general coverage like array comparative genomic hybridization.  as many of these syndromes are phenotypically recognizable and allow for easy cl...

This article develops an algorithm for a group of guards statically positioned in a nonconvex polygonal environment with holes. Each guard possesses a single searchlight, a ray sensor which can rotate about the guard’s position but cannot penetrate the boundary of the environment. A point is detected by a searchlight if and only if the point is on the ray at some instant. Targets are points whi...

Blakley, Blakley, Chan and Massey conjectured a lower bound on the entropy of broadcast messages in threshold schemes with disenrollment. In an effort to examine the conjecture, we identify their original scheme definition has a limitation: a coalition of participants can reconstruct all shared secrets without broadcast from the dealer, and hence render the dealer no control over disenrollment....

Blakley, Blakley, Chan and Massey conjectured a lower bound on the entropy of public broadcast in a threshold scheme with disenrollment capability. In this paper, we first show that the conjecture need not be true in general. Then we establish a tight lower bound on the entropy of public information by introducing one property to the definition of threshold schemes with disenrollment. We also p...

JDSF was recently contacted by the UC Forest Products Labor­ atory (FPL) with a request for madrone and tanoak logs for exper­ imental testing. The only requirement was that the logs be a minimum of 18 inches in diameter at the small end. Chief Sales Officer Hank Land and Heavy Forestry Equipment Operator Mike Williams were equal to the task. They felled, bucked and loaded the logs onto Univers...