in this paper, different input-oriented ratio-based dea (dea-r-i) models are proposed. by presenting the envelopment-additive-enhanced russell model based on the dea-r-i form, each decision making unit is evaluated and its efficiency score is calculated. also, by presenting the central resource allocation model based on the dea-r-i form, a suitable benchmark for all dmus is proposed by solving ...

A method is proposed to assist participants in the design of complex integrated models for engineering design. The approach builds on the DOME (Distributed Object-based Modeling and Evaluation) framework, which is intended to facilitate the creation of integrated models by allowing groups of designers to link services of models encapsulated by distributed objects. The aim is to provide a tool f...

rapid urbanization and industrialization, population growth and economic growth in developing countries make management of municipal solid waste more complex comparing with developed countries. furthermore, the conventional municipal solid waste management approach often is reductionists, not tailored to handle complexity. therefore, the need to a comprehensive and multi-disciplinary approach r...

in this paper mathematical extensions and generalizations of the pearl-reed model for'growth with saturation are discussed. the derived differential equation are of bernoulli and riccati type that owing to their special forms could be explicitely integrated resulting in closed form solutions. the asymptotic bahaviour of the system in each case is briefly examined and the results are compar...