A parallel algorithm for solving a classical geometric problem, the upper envelope of segments in the plane, is proposed. In this paper, an accurate analysis of its theoretical time complexity is presented. Moreover, considerations related to its implementation are discussed. In such implementation, distribution management relies upon PVM a software system supporting heterogeneity at the applic...

Existing Grid technology has been foremost designed with performance and scalability in mind. When using Grid infrastructure for medical applications, privacy and security considerations become paramount. Privacy aspects require a re-thinking of the design and implementation of common Grid middleware components. This chapter describes a novel security framework for handling privacy sensitive in...

This paper presents a fast implementation to compute the scalar multiplication of elliptic curve points based on a General-Purpose computing on Graphics Processing Units (GPGPU) approach. A GPU implementation using Dan Bernstein's Curve25519, an elliptic curve over a 255-bit prime eld complying with the new 128-bit security level, computes the scalar multiplication in less than a microsecond on...

This paper discusses some of the practical considerations involved in the synthesis and implementation of override compensators for systems which have outputs constrained to lie below certain thresholds. The paper assesses three different override architectures: the first, a generic override control scheme from the literature; the second, a sub-class of the first which offers easier tuning and ...

In this paper I cover the design and implementation of the rc.d system start-up mechanism in NetBSD 1.5, which replaced the monolithic /etc/rc start-up file inherited from 4.4BSD. Topics covered include a history of various UNIX start-up mechanisms (including NetBSD prior to 1.5), design considerations that evolved over six years of discussions, implementation details, an examination of the hum...

In this paper we describe an experimental implementation of the MicroMint micropayment scheme in Java. We apply this scheme to purchasing Web pages. A prerequisite was to accomplish this without having to change the code of either the Web server or the Web client. We discuss the implementation issues and security considerations. Our implementation requires the local protocol handler feature off...

The Shrinking Generator, presented at Crypto'93, is a LFSR-based pseudorandom generator suitable for the implementation of additive stream ciphers. It is particularly simple and has attractive security properties. (The reader is referred to [1] for the definition of the generator and its properties). Although the algorithm was originally intended for hardware implementation, here we will focus ...

BACKGROUND Health in All Policies (HiAP) is a form of intersectoral action that aims to include the promotion of health in government initiatives across sectors. To date, there has been little study of economic considerations within the implementation of HiAP. METHODS As part of an ongoing program of research on the implementation of HiAP around the world, we examined how economic considerati...