Query: Marko Radanovic

title: Geometric accuracy and semantic richness in heritage BIM: A review
abstract: This paper reviews the existing heritage building modelling approaches, both parametric and reality based, with the focus being upon geometric accuracy and semantic richness of the generated models. Our review identifies that there is currently no approach that offers both and that there is always a trade off between visual fidelity and parametric flexibility of the final model. We address this major challenge by proposing a novel concept for heritage building information modelling (BIM) based on a platform that uses a layered structure, where integrated and interconnected layers can include data and models of different types such as a polygonal textured mesh, point cloud, and parametric building information model. The proposed approach combines parametric and reality based modelling approaches and takes advantage of the strengths of each, thus meeting the requirements of a variety of applications, and it simplifies the scan to BIM process which has been recognised as a bottleneck in heritage BIM.

title: Impact of Height Datum Parameters on Height Reference System Realizations: Case Study in Croatia
abstract: AbstractThe Croatian Height Reference System for the epoch 1971.5 (HVRS71) is the official height reference system of the Republic of Croatia, newly established after Croatia's independence. By usi.

title: Test analysis of a scalable UAV conflict management framework
abstract: This study elaborates the conflict management framework of unmanned aerial vehicles, focusing on the identification of the spatiotemporal interdependencies between them, with consideration of the future scalability problems in highly dense traffic scenarios. The paper first tries to justify the applied separation criteria among small cooperative unmanned aerial vehicles based on their performance characteristics and the planned missions' type. The adopted criteria, obtained from the simulations of 160 missions, present a testing asset, referring to a current lack of the spatiotemporal requirements and a need for extending the research in this area to provide a more rapid integration of these vehicles into the civil controlled airspace. The paper then elaborates the computational framework for the conflict detection and resolution function and operational metrics for causal identification of the spatiotemporal interdependencies between two or more cooperative vehicles. The vehicles are considered as a conflict mission system that strives to achieve an efficient solution by applying certain maneuvering measures, before a loss of separation occurs. The operational trials of five local, short range missions, supported by the simulation scenario, demonstrate the potential for a time based complexity analysis in the conflict resolution processes with less demanding and more efficient coordinated maneuvers. The results show that those maneuvers would not induce any new conflicts and disrupt the cooperative mission system when the spatial capacity only might not be favorable in provision of the avoidance maneuvers within an available airspace.

title: A Methodology to Perform Air Traffic Complexity Analysis Based on Spatio Temporal Regions Constructed Around Aircraft Conflicts
abstract: One of the main missions of air traffic management is to guarantee en route safety. This safety is quantified through some minimum separation distance between pairs of flying aircraft. Current systems are human based, i.e. have human air traffic controllers assuring minimum separation is maintained and in cases a loss of separation is predicted, they take actions to prevent the occurrence of such events. The constant and rapid increment of the air traffic demand is pushing current air traffic control systems to their limits. Development of automatic decision support systems, which can be used to automate, or support aircraft conflict detection and resolution, is considered a possible solution. However, the combinatorial nature of the problem poses several challenges for such a task. Metrics or various analytical procedures to produce information about the complexity of given scenarios can be used to guide the solution search process. In this paper, we present a complexity analysis based on the spatio temporal interdependencies identified by the use of spatio temporal regions constructed around the aircraft conflicts.

title: Simulation of an Alternative Realisation of the Croatian Height Reference System

title: Quality Evaluation of the Earth's Crust Height Movement Kinematic Model in the Northern Part of the Republic of Croatia

title: A Negotiation Mechanism for a Consensus in Air Traffic Conflict Resolution
abstract: The demand for drone services is increasing at a very fast pace, holding enormous promise in terms of business opportunities, economic growth with the development of a multitude of new and innovative services, as well as societal benefits. Autonomous aerial vehicles rely on new technologies that can ensure a stable flight in a controlled volume but it lacks cooperative mechanisms in unmanned traffic management airspace areas. In this paper it is presented a new framework to support a negotiated conflict resolution mechanism in which aircraft compete to preserve their preferred trajectories while at the same time cooperate to maintain safety factor levels. An ontology has been designed to support an ecosystem vision to enhance a win to win resolution under an overriding resolution control in case a negotiation deadlock is predicted.

title: Adaptive aerial ecosystem framework to support tactical conflict resolution
abstract: To support a seamless transition between safety net layers in air traffic management, this article examines an extra capacity in the generation of the resolution trajectories, conditioned by future high dense, complex surrounding air traffic scenarios. The aerial ecosystem framework consists of a set of aircraft services inside a digitalised airspace volume, in which amended trajectories could induce a set of safety events such as an induced collision. Those aircraft services strive to the formation of a cost efficient airborne separation management by exploring the preferred resolutions and actively interacting with each other. This study focuses on the dynamic analysis of a decreasing rate in the number of available resolutions, as well as the ecosystem deadlock event from the identified spatiotemporal interdependencies among the ecosystem aircraft at the separation management level. A deadlock event is characterised by a time instant at which an induced collision could emerge as an effect of an ecosystem aircraft trajectory amendment. Through simulations of two generated ecosystems, extracted from a real traffic scenario, the paper illustrates the relevant properties inside the structure of the ecosystem interdependencies, demonstrates and discusses an available time capacity for the resolution process of the aerial ecosystem.

title: Ispitivanje kvalitete kinematickog modela recentnih relativnih visinskih gibanja Zemljine kore na teritoriju poluotoka Istre

title: A comparative analysis of different methods for identification of the evolution of number of possible conflict free airspace configurations including multiple aircraft and single conflict
abstract: Continuous increase in the traffic density over the certain enroute sectors provokes many situations in which a loss of separation minima (SM) between two aircraft occurs. Although, this loss is predicted well in advance, giving a proper look ahead time (LAT) for a detection function, the resolution of such an event may lead to a new conflict situation due to dynamics of surrounding traffic aircraft. A multi agent system framework can deal with these cases. This work presents three different complexity indicators that can be used to shape the social behavior of the agents. Simulation results show that the proposed indicators can suggest drastically different nature of the same ecosystem, therefore further investigation of the correlation of the proposed indicators to the actual complexity is necessary.