government interventions in agricultural markets in order to stabilize commodity prices and producer incomes have had a long tradition. intervention has been at both the state and country levels and has been for the most part in the form of commodity-based schemes. this study represents an attempt to develop an appropriate methodology for analyzing the aggre-gate effects of a particular type of...

this paper presents a macro model to predict unreinforced masonry structures in plane behavior. the model is based on the concept of multilaminate theory. in the past, the method has been used to model behavior of soil, disregarding the cohesion and the tensile strength. regarding its mathematical base, and the possibility of applying in other cases, this method is used to predict the ultimate ...

This tutorial gives an overview about mathematical modeling methods for complex and self-organizing systems. Modeling can be used for the analysis and optimization of existing systems and for the design and engineering of new systems. In this tutorial we classify modeling methods into macro-level modeling and micro-level modeling. By using a micro-level model, the behaviors of all entities of t...

A SAS macro called genreg is available from the author for conducting adaptive regression modeling. It is written primarily in the matrix language PROC IML and supports nonparametric linear, logistic, and Poisson regression modeling of expected values and/or of variances/dispersions in terms of fractional polynomials in one or more predictor variables. Fractional polynomial models are compared ...

We define the class of micro-macro stack graphs, a new class of graphs modeling infinite-state sequential systems with a decidable model-checking problem. Micro-macro stack graphs are the configuration graphs of stack automata whose states are partitioned into micro and macro states. Nodes of the graph are configurations of the stack automaton where the state is a macro state. Edges of the grap...

Linking material property acquisition and modeling in the nanometric scale with those on the macro-scale is currently one of the most challenging fields of research in material science in general and in micromachining in particular. Due to computational limitations it is presently impossible to inflate atomic level models and simulations to the macro sized components we work with daily. This kn...