This paper concentrates on the quality management of a project by applying network approaches and statistics methods. A large-scale project can be modeled as a project network. This paper tries to schedule the duration of the project by applying the approaches in network analysis in case the activity duration and the corresponding cost are both arbitrary random variables with a probability dist...

The aim of this paper is to propose a robust reliable bi-objective supply chain network design (SCND) model that is capable of controlling different kinds of uncertainties, concurrently. In this regard, stochastic bi-level scenario based programming approach which is used to model various scenarios related to strike of disruptions. The well-known method helps to overcome adverse effects of disr...

The objective of this paper is to study how important it is to take uncertainty into account in a service network design problem during the planning phase. We look at how a solution based on uncertain demand differs from a solution based on deterministic demand and show that there can be important structural differences between them. Some of these structural differences help hedge against uncer...

The public transport reform discussion initiated in 1992 in the Netherlands ended in 2000 with the enactment of a new passenger transport law. According to this new law, about a third of public transport services will have to be tendered by regional authorities in the coming years. In the meantime, a few regional railway lines have been contracted or tendered and preparations are made to tender...

Chicago’s O’Hare airport is extremely congested, especially in the late afternoon and early evening. The paper uses a publicly available database to estimate the relationship between the number of flights wishing to depart and the delays they experience. This relationship is used to calculate congestion fees that provide airlines with incentives to move some flights out of the peak period and t...

This paper provides a model for time reduction in a project through adding linkage intensity in a project network. The traditional network calculation and symbolization are modified and designed a new method to consider the linkage intensity in a network. Then, by using a multiple regression model, a formula for calculation of time reduction potential in a project network is introduced. It is f...

from 22 may 1976 to 19 february 1977 out of 27742 patients which were referred to health and social welfare network of west azerbaijan in chonqralu (field laboratory of school of public health and institute of public health research in health services development research project in iran), 22693 (81.81%) simple cases were managed by the behvarz (female front line health worker), in nine health ...