Since the advent of the law 86/14 concerning the exploitation of the national territory by foreign companies in partnership with the Algerian oil and gas company, the problem of hydrocarbons metering in the sharing production come out. More generally, good management counting hydrocarbons can provide data on the production wells, the field and the reservoir for medium and long term planning, pa...

This paper implements the inventory model developed in the first part of this paper in a simplified problem to simultaneously reduce costs and risks in JIT systems. This model is developed to ascertain an optimal ordering strategy for procuring raw materials by using regular multi-external and local backup suppliers to reduce the total cost of the products, and at the same time to reduce the ri...

Just-In-Time (JIT) is a lean manufacturing tool, which provides the benefits of efficiency, and of minimizing unnecessary costs for many organisations. However, the risks arising from these benefits have been disregarded. These risks impact on system processes disrupting the whole supply chain. This paper proposes an inventory model that can simultaneously reduce costs and risks in JIT systems....

Many cities in the Global South are structurally different from Northern, particularly American, on which much of urban sociology’s conceptual apparatus has been based. Thus, depicting them terms a standard vocabulary risks imposing an inappropriate way seeing. We need that is able to accommodate their experience. This special issue contributes work building vocabulary. select five keywords soc...

This paper characterises optimal monetary policy in an economy with endogenous …rm entry, a cash-in-advance constraint and preset wages. Firms must make pro…ts to cover entry costs; thus the markup on goods prices is e¢cient. However, because leisure is not priced at a markup, the consumption-leisure tradeo¤ is distorted. Consequently, the real wage, hours and production are suboptimally low. D...

We introduce a medical control model, in the sense of an optimal control problem, which simulates the interaction of immune system with HIV. This model shows the strategy of chemotherapy treatment. In fact, the simulated optimal control pair, , represents the virus production and the percentage effect of the chemotherapy on the T cells. We define an objective function characterized based on max...

Using control function approaches to endogeneity, nonparametric identi…cation is established for production functions under weak conditions. The distribution of productivity is also recovered nonparametrically. Instead of "inverting out" the productivity shock, control functions "expect out" unobserved shocks. Controls are estimated using lagged levels of capital and labor as instruments, and t...