Recent increases in the number of high-speed, large-scale, and heavy-load vessels have
made marine traffic more complex. Traffic situations are more difficult to manage as a result …

In spite of the significant effects of COVID-19, UAM operations are still expected to grow
smoothly and healthily in the near future. If such dense UAM traffic relies on tactical planning …

The characterization of complex air traffic situations is an important issue in air traffic
management (ATM). Within the current ground-based ATM system, complexity metrics have …

Airspace complexity is defined as an essential indicator to comprehensively measure the
safety of air traffic operational situations. A reliable prediction of airspace complexity can …

Identification of regional collision risk in water area is of significance for the safety of
navigation. However, traditional risk identification models are subject to the limitations in …

Abstract Large numbers of Urban Air Mobility (UAM) vehicles are expected to operate in
urban airspace in the near future, exceeding the capacities of current airspace and Air Traffic …

The absence of a regional, open water vessel collision risk assessment system endangers
maritime traffic and hampers safety management. Most recent studies have analysed the risk …

Airspace capacity has become a critical resource for air transportation. Complexity in traffic
patterns is a structural problem, whereby airspace capacity is sometimes saturated before …

This study proposed a new method to describe air traffic situations based on the theory of
complex networks and elaborate its evolutionary laws, expecting to reveal the basic …

In high-density urban air mobility (UAM) operations, mitigating congestion and reducing
structural constraints are key challenges. Pioneering urban airspace design projects expect …