A t w threshold scheme is a method for sharing a secret among w shareholders so that the collaboration of at least t shareholders is required in order to reconstruct the shared secret This paper is concerned with the re use of shares possessed by shareholders in threshold schemes We propose a simple t w threshold scheme based on the use of cryptographically strong pseudo random functions and un...

This article discusses the development of a computerized support to demands for treatment of a wide spectrum and diverse nature. Developed under SPM platform (Situação, Problema e Melhoria), the practitioner seeks to provide an ergonomic aid from the identification and characterization of the processes of analysis demands. The interest of a technological support the practice of ergonomics is a ...

The debate over whether activated Ras can regulate phosphoinositide-specific phospholipase C (PLC) has been contentious and at times heated. The argument may be resolved by the recent identification of a novel Ras-regulated PLC, but some unexpected properties of this protein are sure to stimulate further controversy.

We examine the cross-sectional relation between the twelve-month real change in shares outstanding and stock returns. During the post-1970 time period, change in shares outstanding exhibits a strong cross-sectional ability to predict stock returns. This predictive ability is typically stronger than the predictive ability of size, book-to-market, or momentum. Our finding is related to research t...

Over the past two decades a number of Chinese companies have issued shares on both the Hong Kong Stock Exchange and on one of the Chinese stock exchanges. The Hong Kong-listed H-shares of Chinese dual-listed companies have traded at a persistent discount rate relative to the China-listed A-shares. As these shares represent the same ownership rights and cash flows, the shares should theoreticall...