This paper treats the problem of setting the inventory level of closed-loop owlines operating under the constant-work-in-process (CONWIP) protocol. We solve ahuge but simple linear program that models an entire simulation run of a closed-loopow line in discrete time to determine a production...

The production planning with renewable resources faces several special problems compared tocommon planning methods with inputs which are “always available”. Due to their unsteadiness ingrowth, external influences like weather and natural resources and specific transport and...

In Folge der steigenden Nachfrage nach ethischen Kapitalanlagen stehen die Unternehmen vor der Herausforderung, neben den typischen monetären Zielen auch Umweltschutzziele in die Investitionsbewertung einbeziehen zu müssen. Bestehende Ansätze der Investitionsbewertung unter Berücksichtigung...

Background: Traceability systems and carbon emissions are two important factors involved in production and distribution activities. The involvement of these two factors in production and distribution activities along the supply chain will ensure the safety and quality of food through the...

Providing a good formulation is an important part of solving a mixed integer program.We suggest to measure the quality of a formulation by whether it is possible tostrengthen the coefficients of the formulation. Sequentially strengthening coefficientscan then be used as a tool for improving...

Sharpe style regression has become a widespread analytic tool in the financial community. Thestyle regression allows one to investigate such interesting issues as style composition, style sensitivity, andstyle change over time. All previous methods to obtain the distribution and confidence...

CMPL (Coliop Mathematical Programming Language) is a mathematical programming language for modelling linear programming (LP) problems or mixed integer programming (MIP) problems. The CMPL syntax is similar in formulation to the the original mathematical model but also includes syntactic elements...

Mit der Entwicklung von Multiagentenmodellen für die Landwirtschaft konnten betriebliche Entscheidungsverhalten und Interaktionen in die Simulation von kleineren Agrarregionen einbezogen werden. Wichtige methodische Impulse dazu kamen insbesondere von Wissen-schaftlerinnen und Wissenschaftlern...

The County Business Patterns data published by the US Census Bureau track employment by county and industry from 1946 to the present. Two features of the data limit their usefulness to researchers in practice: (1) employment for the majority of county-industry cells is suppressed to protect...

This paper addresses two main questions: (1) What are the binding constraints to Guinea's economic growth? and (2) What would it take to accelerate growth in the country? Using the growth diagnostic approach, the paper finds three binding constraints to growth: (i) lack of good infrastructure...