Building simple and accurate models of hub airports can considerably help one understand airport dynamics, and may provide quantitative estimates of operational airport improvements. In this paper, three models are proposed to capture the dynamics of busy hub airport operations. Two simple queuing models are introduced to capture the taxi-out and taxi-in processes. An integer programming model ...

The boarding process has a very important role in the objective of increase the efficiency, profitability, and customer satisfaction of an airline industry. It is one of the significant elements of the turnaround time, a slow boarding process might lead to financial issues to the company and, of course, customer complaints. In this paper are analyzed three boarding strategies presenting a model...

Purpose: School district superintendents say politics is the number one factor limiting their performance, yet research provides limited guidance on navigating the political dynamics of district improvement. State takeovers and district-wide turnaround efforts tend to involve particularly heated and polarized debates. Massachusetts’ 2012 takeover of the Lawrence Public Schools provides a rare c...

CPU utilization, throughput, turnaround time, waiting time, and response time are the factor to influence system performance. Every system uses different scheduling algorithms to achieve his goal. In the grid computing, resources usages are important to get good performance . When jobs are not uniformly distributed in all grid nodes, job scheduling is more important . In order to achieve perfor...

Despite the undoubted importance of IT-enabled transformations for sustaining firm competitiveness, we are only at the beginning of understanding the conflicts and resolution strategies in IT transformation program planning and execution. Given the well-known global versus local tensions, practitioners might be tempted to balance the different extremes by remaining ‘ambidextrous’ throughout the...

OBJECTIVE The aims of this study were to describe overcrowding in regional emergency departments in Seoul, Korea and evaluate the effect of crowdedness on ambulance turnaround time. METHODS This study was conducted between January 2010 and December 2010. Patients who were transported by 119-responding ambulances to 28 emergency centers within Seoul were eligible for enrollment. Overcrowding w...