This paper discusses how to extend the applicability of the recursive cascade update command of the Xplain query language. This command guarantees termination because cycle detection is included, which is in favor of end user computing. The execution of this command is based on graph reduction; therefore it can only be applied to acyclic graphs. Because flights constitute cycles between airport...

As an important transportation hub for air transportation, airports have played role in promoting regional economic and social development improving the comprehensive national system. The exploration of key factors affecting airport’s operational capacity are great importance to sustainable civil aviation industry. In order investigate effect airport operation, this paper selects 13 major China...

By providing real-time updates of essential information, airports not only display and disseminate information but also help control the flow of traffic. In order to maximize available space, particularly in high traffic areas, Airport Display Information Systems should be integrated into the overall design of the airport and their positioning should be carefully planned to deliver optimal resu...

The increased amount of flights in airports has caused serious problems for passengers and airlines, and brings risks to the system of ground traffic. The sequencing of taxi management is responsible for coordinating the process of rolling the aircraft from gate to track, or conversely, depending on the procedure for takeoff or landing. In this paper, it presents an optimization solution of tax...

Future cockpit and aviation applications require high quality airport databases. Accuracy, resolution, integrity, completeness, traceability, and timeliness [1] are key requirements. For most aviation applications, attributed vector databases are needed. The geometry is based on points, lines, and closed polygons. To document the needs for aviation industry RTCA and EUROCAE developed in a joint...

Typically international airports have features quite distinct from those of

Airport Organizations are faced with the increasingly complex task of integrating facility development projects with operational airport systems. Computer network systems present promising opportunities for meeting this challenge. The goal of improving the integration of airport systems is similar to the goal of computerintegrated construction in the Architectural, Engineering, Construction and...

This paper analyzes arrival flight track data at Chicago (ORD) and Atlanta (ATL) airports. We investigate distributions of vertical and lateral position at different distances from the runway threshold in instrument meteorological conditions (IMC) and visual meteorological conditions (VMC). In IMC, the observed standard deviations at different distances are similar between the two airports. The...

A runway incursion is defined as any occurrence in the airport runway environment involving an aircraft, vehicle, person, or object on the ground that creates a collision hazard or results in a loss of required separation with an aircraft taking off, intending to take off, landing, or intending to land. Multiple factors could contribute to runway incursion, including pilots’ failure to accurate...