dynamic model

Few areas in economics enjoy better theoretical grounds than Indus- trial Organization. And David Austretsch has greatly contributed to improve the IO field with his own dynamic models of entrepreneurship and, also, the inspiration and stimulus he has instilled to other scholars. In his article published in this issue Au- dretsch discusses two main concepts: one is the model of the filter of knowledge; the other is the idea of entrepreneurship capital. The concept of filter of knowledge is

In this paper we illustrate the properties and the morphology of a human like neural reflex controller, used to set the stiness and joint positions of an anthropomorphic artificial hand. In particular we explain, by simulations results, its ability to emulate the myotatic human reflex, and its capacity to learn in real time the best control strategy. We also present

Gains from productivity and knowledge transmission arising from the presence of foreign firms have received a good deal of empirical attention, but theoretical micro-foundations for this mechanism are limited. Here we develop a dynamic model in which foreign experts may train domestic workers who work with them. Gains from training can in turn be decomposed into two types: (a) obtaining

The reverse engineering of metabolic networks from experimental data is traditionally a labor-intensive task requiring a priori systems knowledge. Using a proven model as a test system, we demonstrate an automated method to simplify this process by modifying an existing or related model--suggesting nonlinear terms and structural modifications--or even constructing a new model that agrees with the system's time series

... System Using MATLAB/SIMULINK Dr. Jameel Ahmed*, Dr. Bilal A. Alvi**, Zeeshan Ali khan* *NFC Institute of Engineering and Technology, Multan, Pakistan **Sir Syed University of Engineering & Technology, Karachi Email: Jameel@nfciet.edu.pk ...

This paper presents a dynamic model of a fuel cell system for residential power generation. The models proposed include a fuel cell stack model, reformer model and DC/AC inverter model. Furthermore a fuzzy logic (FLC) controller is used to control the active power of PEM fuel cell system. The controller modifies the hydrogen flow feedback from the terminal load. Simulation results confirmed the high performance capability of the fuzzy logic controller to control power generation. K e y w o r d s: polymer-electrolyte fuel cell, dynamic model, residential power, fuzzy controller

Available data have consistently pointed up the failure of U.S. policies to reduce undocumented migration from Latin America. To shed light on the reasons for this failure, we estimated a series of dynamic models of undocumented entry into and exit from the United States. Our estimates suggest that undocumented migration is grounded more in mechanisms posited by social capital theory and the new economics of labor migration rather than neoclassical economics. As a result, U.S. efforts to increase the costs of undocumented entry and reduce the benefits of undocumented labor have proven unsuccessful given the widespread access of Latin Americans to migrant networks. The main effect of U.S. enforcement efforts has been to reduce the circularity of Latin American migration.

Abstract. This paper presents a Real Time Optimization (RTO) system to optimize a simulated industrial semi-autogenous mill (SAG) using genetic algorithms (GA). For the design of the RTO we used both a validated first principles steady state model adapted on-line and a ...

This report describes the building of a simulator for prediction of the dissolved oxygen concentration, the oxygen transfer rate and the concentration of carbon dioxide in a fermentation process. The steady state models were made using the linguistic equations method. The dynamic models were made using Simulink® toolbox in the Matlab®. At the beginning, some basics about fermentation and microbiological

In this paper, a dynamic model for Toyota Prius 2004 hybrid electric vehicle (HEV) is presented. The model is based on MATLAB Simulink HEV model which is modified in such a way that dynamic response of model can be verified by experimental results given in DOE reports for Toyota Prius 2004. The newly developed model can help the designers to

This paper studies the influence of road camber on the stability of single-track road vehicles. Road camber changes the magnitude and direction of the tire force and moment vectors relative to the wheels, as well as the combined-force limit one might obtain from the road tires. Camber-induced changes in the tire force and moment systems have knock-on consequences for the vehicle’s stability. The study makes use of computer simulations that exploit a high-fidelity motorcycle model whose parameter set is based on a Suzuki GSX-R1000 sports machine. In order to study camber-induced stability trends for a range of machine speeds and roll angles, we study the machine dynamics as the vehicle travels over the surface of a right circular cone. Conical road surfaces allow the machine to operate at a constant steady-state speed, a constant roll angle, and a constant road camber angle. The local road-tire contact behavior is analyzed by approximating the cone surface by moving tangent planes lo...