This paper deals with a special case of Project Scheduling problem: there is a project to schedule, which is made up of activities linked by precedence relations. Each activity requires specific skills to be done. Moreover, resources are staff members who master fixed skill(s). Thus, each resource requirement of an activity corresponds to the number of persons doing the corresponding skill that...

Photopolymers can be appealing materials for diffractive optical elements fabrication. In this paper, we present the recording of diffractive lenses in PVA/AA (Polyvinyl alcohol acrylamide) based photopolymers using a liquid crystal device as a master. In addition, we study the viability of using a diffusion model to simulate the lens formation in the material and to study the influence of the ...

This paper describes a modeling and analyzing method for batch sequential control systems by using colored Petri net (CPN) model. For this purpose, we propose systematic procedures to create CPN model from a various information based on ISA S88, i.e., master recipe, equipment information and batch schedule. To examine the effectiveness of the proposed method, we applied it to a two-step polymer...

In the Mediteranian area a large number of open, ancient Greek and Roman theatres are still today facing a busy schedule of performances including both classical and contemporary works of dance, drama, concerts, and opera. During the EU funded "Erato" project and a subsequent master thesis project, extensive measurement data have been collected from four well preserved theatres, which represent...

Background: To evaluate the present status of blood utilization and develop practice guidelines in teaching hospitals in Northern Iran. Methods: We retrospectively analyzed the amount of blood prepared and used preoperatively for 11 elective procedures, from March 2010 to March 2011 in teaching hospitals in Northern Iran. Study variables included the crossmatch transfusion ratio, the transfusi...

Current surgical scheduling system has difficulties to handle unpredictable events or uncertainties. Source of uncertainties may come from the patient or the surgery itself, where several cases require immediate changes in data, such as when surgery delays or cancellation occurs on the same day. The study aimed to model the uncertainties for managing identified uncertainties during the continuo...

In case of a disaster, hospitals must be able to receive, in a short period, injured persons for medical and surgical treatment, using available resources and facilities. In such situations different disruptions widely perturb the execution of the established plans. Then medical resources optimization is fundamental to save human lives. Our works focus on operating rooms scheduling taking into ...

the passenger line planning is a process of strategic long-term decision-making problem in the field of railway passenger planning. a line is a route between starting point and destination with certain stops, which has a certain frequency of train schedule. a new solution based on decomposition algorithm has been proposed in this paper, which is defined in a master problem and two sub problems....

This thesis describes a stochastic ship routing problem with inventory management. The problem involves finding a set of least costs routes for a fleet of ships transporting a single commodity when the demand for the commodity is uncertain. Storage at consumption and supply ports is limited and inventory levels are monitored in the model. Consumer demands are at a constant rate within each time...