In a railway network with dense traffic, trains’ scheduled arrival and departure times are highly dependent on each other and even a small delay easily propagates to subsequent trains using the same infrastructure resources. In the current paper a given timetable is compared to a modified timetable, where the assigned minimum time slot in the traffic for a service is linearly increasing with th...

I received an IUSB Faculty Research Grant $2,176 for project " The Robustness of the Three-Way Chart to Non-normality " in April 2004. I purchased a new PC in May for about $1,800, and spent $150 for a one-year local license of MatLab software for the PC. The new PC with fast processor and large memory capability allowed me to run some large calculations for the stated project. Orleans regularl...

The aim of the train timetabling problem is to find a conflict free timetable for a set of passenger and freight trains along their routes in an infrastructure network. Several constraints like station capacities and train dependent running and headway times have to be satisfied. In this work we deal with large scale instances of the aperiodic train timetabling problem for the German railway ne...

The objective of this paper is initially to present a basic modeling of the railway traction system. This model includes the basic technologies used today. The voltage dependencies of the maximal possible power consumption as well as the maximal velocity of the common Rc-locomotives are included. The latter is very crucial for the studies of time table sensitivity, which is of our immediate int...

As a significant mitigation strategy to fight climate change, Carbon Capture & Storage (CCS) demonstration projects have received huge amount of public funding across the world. After examining three large scale integrated CCS coal-fired power demonstration projects, which are carried out by America, Europe and China, this paper presents three different approaches that three authorities are tak...

Background & Aims: Shift work is programmed in various schedules, each has its own advantages and disadvantages. The main purposes of this study were: a) to determine common shift schedules used in petrochemical industries, b) to compare shift work health-related problems among employees working in different shift schedules and c) to recommend appropriate shift schedule. Methods: This cross...

We consider an electricity consumer equipped with a perfect battery, who needs to satisfy a non-elastic load, subject to external control signals. The control imposes a time-varying upper-bound on the instantaneous energy consumption (this is called “Demand-Response via quantity”). The consumer defines a charging schedule for the battery. We say that a schedule is feasible if it successfully ab...

This paper investigates the effects of preventive-maintenance cost functions on the optimal preventive-maintenance policy for a leased product with Weibull life-time distribution. During the lease period, any product failures are rectified by minimal repairs and may incur a penalty to the lessor, if the time duration for performing a minimal repair exceeds a pre-specified time limit. To reduce ...