the partial differential equations for water flow and solute transport in a two-dimensional saturated domain are rendered discrete using the finite difference technique; the resulting system of algebraic equations is solved using a dynamic programming (dp) method. the advantage of the dp algorithm is that the problem is converted from solving an algebraic system of order nc(nl-1) nc(nl-1) into...

interest as investment opportunity cost or in other words cost of obtaining the credit requirement in the production process, have a key role in the good's cost price and hence it's necessary to control this kind of variables that have harmful effects on the interest rate's trends. among this, the unexpected changes in some variables that can have destructive effects on interest ...

A firm owns the investment rights over one undeveloped oilfield with technical uncertainties on the size and quality of the reserve. In addition, the long run expected oil price follows a stochastic process. The firm needs to select the best alternative of investment in information with different costs and different revelation powers. The modeling of technical uncertainty uses the practical con...

We consider energy investment, when a choice has to be made between fossil fuel and biomass fired production technologies. A dynamic model is presented to illustrate the effect of the different degrees of input price uncertainty on the choice of technology and the timing of the investment. It is shown that when the choice of technology is irreversible, it may be optimal to postpone the investme...

using the treynor and mazoy model (expanded by fama to evaluate management performance for asset allocation among investment units), this paper examines the management’s performance in funds and investment companies in tehran stock exchange during 2004-2010. the results do not support the application of management market timing during the study period and managers were only able to create addit...

The purpose of research, invention, and production is to effectively supply demand, which requires not only financial support but also time complete. First, the differential dynamic model among funds, research (including invention production) with delay constructed by using predator-prey theory. Second, sufficiency local asymptotic stability positive equilibrium point obtained Hopf bifurcation ...

This paper provides a dynamic optimization model of durable good inventories to study the interactions between investment demand and production of capital goods. There are three major findings: First, capital suppliers’ inventory behavior makes investment demand more volatile in equilibrium; Second, equilibrium price of capital is characterized by downward stickiness; Third, the responses of th...

We present a dynamic model of knowledge management in which knowledge sharing influences organizational culture. Employees’ fit with the organizational culture improves with the sharing and learning of common organizational practices. We analyze the impact of providing incentives for knowledge sharing as well as the investment of information technology in shaping knowledge sharing. Using analyt...