BACKGROUND Joint replacement surgery is having an increasing demand as national healthcare systems confront an ever ageing population. Surgical complications associated with lower limb arthroplasty are well known but less investigation has been performed examining its effect on air travel, more specifically, unwanted and significant inconvenience caused to travelers going through airport securi...

Although physician executives are certainly aware that some patients bypass their hospital, clinic or ambulatory surgery center on the way to the airport to have care in other cities, they may be somewhat surprised to learn that an increasing number of patients are traveling to a wide variety of destinations around the world for medical, surgical and dental care. Driven by a number of forces ou...

We study metapopulation models for the spread of epidemics in which different subpopulations (cities) are connected by fluxes of individuals (travelers). This framework allows one to describe the spread of a disease on a large scale and we focus here on the computation of the arrival time of a disease as a function of the properties of the seed of the epidemics and of the characteristics of the...

In this paper we present two cases of ports. The first case is concerned with the creation of Skavsta airport in Sweden. Grenland Port in Norway is the focus of our second case. There are two research questions for this paper. The first has to do with what happens to existing resources when a new actor tries to activate them. The second question has to do with how single resources can be combin...

Detailed studies on the spatiotemporal patterns of urban agglomeration in the Middle Yangtze River Basin (MYRB) are rare. This paper analyzed the spatiotemporal patterns of urbanization in the MYRB using multi-temporal remote sensing data circa 2000, 2008 and 2016 integrated with geographic information system (GIS) techniques and landscape analysis approaches. A multi-level analysis of the rate...

Security at major locations of economic or political importance is a key concern around the world, particularly given the threat of terrorism. Limited security resources prevent full security coverage at all times, which allows adversaries to observe and exploit patterns in selective patrolling or monitoring, e.g. they can plan an attack avoiding existing patrols. Hence, randomized patrolling o...

The ability of local assessors to accurately estimate land values separately from structure values is important when considering a split tax. When the value of land is estimated with less variation, there is greater equity. We examine land ratios in New London, New Haven, and Hartford Connecticut and sub-groupings within these cities for 2006 to 2010. Overall, the land ratios coefficients of di...

Due to an anticipated increase in air traffic during the next decade, air traffic control in busy airports is one of the main challenges confronting the controllers in the near future. Since the runway is often a bottleneck in an airport system, there is a great interest in optimizing the use of the runway. The most important factors in aircraft landing modeling are time and cost. For this reas...

Preliminary communication The aim of the operation of the security control system at an airport is the prevention of the introduction of forbidden objects to the restricted area of the airport or onto the plane. All passengers and their luggage undergo security control. The security control system is a very specific system. On the one hand, the security control must be performed effectively so ...