Abstract: A drone-based delivery apparatus and method are disclosed for accurately and stably delivering goods to a target marker position in environments involving movement and vibration, such as vessels. The apparatus comprises a delivery drone configured to hover at a target location, a delivery box suspended by a wire, a sensor unit that recognizes a marker using a downward image and calculates a relative position error, an auxiliary propulsion unit that adjusts the horizontal position and attitude of the delivery box, and a controller. The controller accumulates relative position errors over time and selectively controls either the hovering position of the delivery drone or the auxiliary propulsion of the delivery box based on the accumulated error. Through this configuration, goods can be precisely delivered without the drone directly landing on the vessel, thereby improving delivery accuracy and operational safety in marine environments.

Abstract: An adaptive coding and modulation (ACM) apparatus and method for a forward link in satellite communication is provided. The ACM apparatus may include a receiving unit to receive a signal-to-noise ratio (SNR) of a received signal, a determination unit to determine whether the SNR of the received signal is less than or equal to a threshold value, and a processing unit to execute a channel prediction algorithm when the SNR of the received signal is determined to be less than or equal to the threshold value.

Abstract: An adaptive coding and modulation (ACM) apparatus and method for a forward link in satellite communication is provided. The ACM apparatus may include a receiving unit to receive a signal-to-noise ratio (SNR) of a received signal, a determination unit to determine whether the SNR of the received signal is less than or equal to a threshold value, and a processing unit to execute a channel prediction algorithm when the SNR of the received signal is determined to be less than or equal to the threshold value.