Hyochoong Bang

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An algorithm for optimal arrival flight sequencing and spacing in a near-terminal area is proposed. The optimization problem and algorithm proposed in this paper are developed for a decision-support tool for air-traffic control, which uses discrete delay times as optimization variables. The algorithm is applicable to various scenarios with situational and(More)
An adaptive control technique can be applicable to reorient spacecraft with uncertain properties such as mass, inertial and various misalignments. A nonlinear quaternion feedback controller is chosen as a baseline attitude controller. A linearly added adaptive input supported by neural networks to the base-line controller can estimate and eliminate the(More)
Attitude control law design for spacecraft large angle maneuvers is investigated in this paper. The feedback linearization technique is applied to the design of a nonlinear tracking control law. The output function to be tracked is the quaternion attitude parameter. The designed control law turns out to be a combination of attitude and attitude rate(More)
This paper proposes a novel algorithm for tracking a target from UAV(Unmanned Aerial Vehicle). No knowledge is assumed about the target, apart from being in motion. The algorithm includes optical flow to compute velocity field of sequential frames. Velocity field varies radically near the boundary of the target. This simple fact enables to segregate the(More)
This paper presents a guidance law to operate intelligence, surveillance and reconnaissance missions using cooperative UAVs under known static threats. The guidance law is classified into three levels. In level 1 as the highest level, waypoints of UAVs are selected using different cost functions. In level 2, preliminary paths are generated using the(More)
In this paper, a ducted fan Uninhabited Aerial Vehicle(UAV), being capable of vertical take-off and landing, is studied to understand characteristics and control of the vehicle. The ducted fan UAV is unstable and susceptible to wind due to its external structural shape. Also the ducted fan UAV must change the attitude to gain speed, so it has different(More)
This study suggests a co-evolutionary method for solving pursuit-evasion games with consideration of non-zero lethal radii. The proposed method has three key features. First, it can handle both the final time problem and the miss distance problem simultaneously, by adopting a separated payoff function. Second, the Stackelberg equilibrium instead of the(More)