Embedding robust and eecient algorithms in high-quality reusable software is an eeective means of transferring the expertise of mathematicians to researchers in other disciplines, and a wealth of such software is already available. Unfortunately, its volume and distribution over labyrinthine computer networks makes it diicult for users to locate appropriate tools. The Guide to Available Mathema...

Practical algorithmicmethods for combinatorial optimization prob lems cannot be considered in isolation from the representations that people use when communicating these problems to computer systems Di erent represen tations de ne di erent problem classes for which distinct types of methods are appropriate Conversely di erent methods have di erent ranges of applicabil ity which have motivated a...

Single-site recreation demand and dichotomous choice contingent valuation analyses are typically conducted by implementing models containing strong parametric assumptions, which are rarely underpinned by theoretical arguments. This work illustrates how these assumptions can be relaxed and the estimation conducted semiparametrically by using generalized additive models (GAMs). This approach dire...

In this study, a Taylor method is developed for numerically solving the high-order most general nonlinear Fredholm integro-differential-difference equations in terms of Taylor expansions. The method is based on transferring the equation and conditions into the matrix equations which leads to solve a system of nonlinear algebraic equations with the unknown Taylor coefficients. Also, we test the ...

OQNLP and MSNLP are multistart heuristic algorithms designed to find global optima of smooth constrained nonlinear programs (NLPs). By ”multistart” we mean that the algorithm calls an NLP solver from multiple starting points, keeps track of all feasible solutions found by that solver, and reports back the best of these as its final solution. The starting points are computed by a scatter search ...

The purpose of this paper is to minimize environmental life cycle impact when a detail process modelling is available. A methodology is presented to calculate the optimum operating conditions of an ethylene process utility plant. The overall environmental impact is calculated as a weighted sum of global warming, acidification, eutrophication, photochemical oxidation, ozone depletion, human toxi...

With increasing importance placed on standard quality assurance methodologies by large companies and government organizations, many software companies have implemented rigorous quality assurance (QA) processes to ensure that these standards are met. The satisfaction of these quality checks ensures that the software has achieved a certain level of compliance to standards and thereby gives the co...