The business environment is full of uncertainty. Allocating the wealth among various asset classes may lower the risk of overall portfolio and increase the potential for more benefit over the long term. In this paper, we propose a mixed singlestage R&D projects and multi-stage securities portfolio selection model. Specifically, we present a bi-objective mixed-integer stochastic programming mode...

This paper presents a fuzzy approach for solving the bi-level integer linear fractional programming problem (BILFPP). At the first phase of the solution algorithm and to avoid the complexity of non convexity of this problem, we begin by finding the convex hull of its original set of constraints using the cutting-plane algorithm, and then the Charnes & Cooper transformation is used to convert th...

Rewriting logic appears to have good properties as logical framework, and can be useful for the development of programming languages which attempt to integrate various paradigms of declarative programming. In this paper I propose to tend towards the operational semantics for such languages by basing it on bi-rewrite systems and ordered chaining calculi which apply rewrite techniques to rst-orde...

[1] corresponding author e-mail: [email protected]   [1] corresponding author e-mail: [email protected]   lot-sizing problems (lsps) belong to the class of production planning problems in which the availability quantities of the production plan are always considered as a decision variable. this paper aims at developing a new mathematical model for the multi-level capacitated lsp w...

This paper investigates the cold chain logistics network design in first mile for fresh agricultural products with government subsidy, involving capacity, location of storage facilities, and transportation from production areas to facilities after harvest. A bi-level programming model is formulated considering quality degradation products. Based on proposition KKT conditions, a solution method ...