Abstract: Provided are a drone taxi system based on multi-agent reinforcement learning and a drone taxi operation method using the same. The drone taxi system includes a plurality of drone taxies configured to receive call information including departure point information and destination information from passenger terminals present within a certain range and a control server configured to receive call information of passengers from each drone taxi, select a candidate passenger depending on whether a passenger is present, generate travel route information of each drone taxi from drone state information of the plurality of drone taxies through multi-agent reinforcement learning, and transmit the travel route information to the drone taxi.

Abstract: Provided is a surveillance system employing a plurality of unmanned aerial vehicles (UAVs), the surveillance system showing improved surveillance performance while optimizing common energy consumption for computing of all the UAVs and also providing a stable visual monitoring service using autonomous mobility of the plurality of UAVs regardless of movement of an object to be monitored and action uncertainty of an adjacent UAV.

Abstract: According to example embodiments, a method of driving a power switch device includes applying a first voltage to a gate electrode of the power switch device, and applying a drive voltage to the gate electrode of the power switch device after applying the first voltage to the gate electrode of the power switch device. The first voltage is higher than the drive voltage of the power switch device in a turn-on state.

Abstract: According to an example embodiment, a balancing apparatus includes: bi-directional switches that are respectively connected to cells that are connected in series, a controller configured to measure voltages of the cells, and a multiwinding transformed connected to the bi-directional switches. The bi-directional switches are configured to control a flow of an electric current bi-directionally. The controller is configured to select a number of the cells for balancing based on the measured voltages of the cells. The controller is configured to turn on and turn off the bi-directional switches that are connected to selected cells based on the measured voltages. The multi-winding transformer is configured to transfer energy between the cells when the bi-directional switches connected to the selected cells are turned on.

Abstract: An apparatus for performing balancing on cells connected in series and included in a module may comprise a first switching unit including first cell selection switches respectively connected to the cells, and configured to connect a first cell to be balanced to a balancing unit; a second switching unit including second cell selection switches respectively connected to the cells, and configured to connect a second cell to be balanced to the balancing unit; a controller configured to measure voltages of each cell, and controlling operations of the first switching unit, the second switching unit, and the balancing unit based on information on the first and second cells, wherein the first and second cells are selected by the controller using the measured voltages; and/or the balancing unit, connected to the first and second switching units, and configured to perform balancing between the first and second cells selected by the controller.

Abstract: According to an example embodiment, a battery system includes: a plurality of modules, each including a plurality of cells connected to each other in series and a cell balancing circuit performing a balancing operation between the plurality of the cells based on voltages of the plurality of the cells; and a module balancing circuit performing a balancing operation between the modules based on voltages of the modules.

Abstract: According to example embodiments, a method of driving a power switch device includes applying a first voltage to a gate electrode of the power switch device, and applying a drive voltage to the gate electrode of the power switch device after applying the first voltage to the gate electrode of the power switch device. The first voltage is higher than the drive voltage of the power switch device in a turn-on state.

Abstract: An apparatus for performing balancing on cells connected in series and included in a module may comprise a first switching unit including first cell selection switches respectively connected to the cells, and configured to connect a first cell to be balanced to a balancing unit; a second switching unit including second cell selection switches respectively connected to the cells, and configured to connect a second cell to be balanced to the balancing unit; a controller configured to measure voltages of each cell, and controlling operations of the first switching unit, the second switching unit, and the balancing unit based on information on the first and second cells, wherein the first and second cells are selected by the controller using the measured voltages; and/or the balancing unit, connected to the first and second switching units, and configured to perform balancing between the first and second cells selected by the controller.

Abstract: A circuit may comprise a direct current (DC)/DC boost converter connected to a battery that includes a plurality of cells; a DC link connected between the DC/DC boost converter and an inverter; and/or a charging circuit connected between the battery and the DC link. The charging circuit may be connected to the DC/DC boost converter in parallel. A method of charging a battery using a regenerative energy of a motor may include storing the regenerative energy of the motor by using a converter with a multi-winding transformer, selecting a cell to be charged from among a plurality of cells included in the battery, and transferring the stored regenerative energy to the selected cell by using the converter.

Abstract: According to an example embodiment, a battery system includes: a plurality of modules, each including a plurality of cells connected to each other in series and a cell balancing circuit performing a balancing operation between the plurality of the cells based on voltages of the plurality of the cells; and a module balancing circuit performing a balancing operation between the modules based on voltages of the modules.

Abstract: According to an example embodiment, a balancing apparatus includes: bi-directional switches that are respectively connected to cells that are connected in series, a controller configured to measure voltages of the cells, and a multiwinding transformed connected to the bi-directional switches. The bi-directional switches are configured to control a flow of an electric current bi-directionally. The controller is configured to select a number of the cells for balancing based on the measured voltages of the cells. The controller is configured to turn on and turn off the bi-directional switches that are connected to selected cells based on the measured voltages. The multi-winding transformer is configured to transfer energy between the cells when the bi-directional switches connected to the selected cells are turned on.

Abstract: Disclosed herein are a DC-DC boost converter circuit, which is capable of preventing power loss and stabilizing switching elements by implementing soft switching and improving efficiency by adding a charge pumping function, and a method for driving the same. The DC-DC boost converter circuit, in which an inductor and an output diode are connected in series and an output capacitor and a load are connected to an output port of the output diode in parallel, includes an output stabilization circuit in which first and second switching elements, a transformer, a plurality of boost capacitors, and a plurality of diodes are connected in series/parallel between the inductor and the output diode.

Abstract: Disclosed herein are a DC-DC boost converter circuit, which is capable of preventing power loss and stabilizing switching elements by implementing soft switching and improving efficiency by adding a charge pumping function, and a method for driving the same. The DC-DC boost converter circuit, in which an inductor and an output diode are connected in series and an output capacitor and a load are connected to an output port of the output diode in parallel, includes an output stabilization circuit in which first and second switching elements, a transformer, a plurality of boost capacitors, and a plurality of diodes are connected in series/parallel between the inductor and the output diode.