Abstract: Provided herein are an ultrasonic-based aerosol generation device with a new structure capable of reducing cartridge replacement costs and a control method thereof. The ultrasonic-based aerosol generation device according to some embodiments of the present disclosure may include a replaceable cartridge which is configured to store a liquid aerosol-forming substrate and a control main body which is configured to be coupled to the cartridge. Also, the control main body may include a controller and a vibration member which is configured to generate ultrasonic vibrations to vaporize the aerosol-forming substrate stored in the cartridge. Here, the controller may monitor a temperature of the vibration member and controls operation of the vibration member on the basis of a monitoring result.

Abstract: Provided herein are an ultrasonic-based aerosol generation device, which is capable of reducing cartridge replacement costs and ensuring immediate aerosol generation, and a cartridge recognition method thereof. The ultrasonic-based aerosol generation device according to some embodiments of the present disclosure may include a liquid reservoir configured to store a liquid aerosol-forming substrate, a vibration element configured to provide ultrasonic vibrations to the stored liquid aerosol-forming substrate to form an aerosol, and a porous member which is disposed to be spaced apart from the vibration element and has a plurality of holes formed therein. Here, the liquid aerosol-forming substrate may be pushed in a direction toward the porous member due to ultrasonic vibrations of the vibration element, and the pushed liquid may be rapidly vaporized by passing through the plurality of holes. Accordingly, an aerosol can be generated immediately upon a puff.

Abstract: Provided herein is an ultrasonic-based aerosol generation device capable of ensuring immediate aerosol generation according to puffs and reducing cartridge replacement costs. The ultrasonic-based aerosol generation device according to some embodiments of the present disclosure may include a control main body which includes a vibration member configured to generate ultrasonic vibrations and a cartridge which is replaceable and coupled to the control main body. In this structure, since the vibration member, which is a relatively expensive component, is disposed at the control main body side, the cartridge replacement costs may be significantly reduced. Further, since a vibration transmission member configured to transmit the ultrasonic vibrations of the vibration member to a liquid aerosol-forming substrate is disposed in the cartridge, an aerosol may be smoothly generated.

Abstract: An aerosol generating device includes a cavity into which a cigarette is inserted, a light source that emits light to the cigarette inserted in the cavity, a reuse detection sensor that receives light reflected from the cigarette, a heater that heats the cigarette inserted into the cavity, and a controller, and the controller determines whether or not to operate the heater based on a rate of increase or decrease of a sensing value received from the reuse detection sensor.

Abstract: Provided herein are a porous wick and a vaporizer and aerosol generation device including the same. The vaporizer according to some embodiments of the present disclosure includes a liquid reservoir configured to store an aerosol-generating substrate in a liquid state, a heating element configured to heat the stored aerosol-generating substrate to generate an aerosol, and a porous wick configured to deliver the stored aerosol-generating substrate to the heating element through a porous body and comprising a coating film formed on at least a part of a plurality of surfaces of the porous body. Since a coating film is formed on a surface not associated with a target transport path for a liquid, the liquid can be intensively transported along the target transport path.

Abstract: A cooling assembly for the aerosol-generating article according to an embodiment may include a cooling rod for cooling an aerosol generated by the aerosol-generating article; a perforation formed in the cooling rod and through which air passes; and an air volume regulator disposed on the outside of the cooling rod to cover the perforation, and regulating an amount of air passing through the perforation as the air volume regulator moves from one position to another.

Abstract: A motor driven power steering control method may include setting a virtual steering system model including a column connecting a steering wheel to a rack gear, determining a column stiffness torque using torsional displacement of the column in the set virtual steering system model, and determining a target steering torque based on the determined column stiffness torque.

Abstract: A motor driven power steering control method may include setting a virtual friction model to a column connected between a steering wheel and a rack gear; calculating a frictional torque of the column by taking a steering angular speed of the steering wheel as an input parameter in the set virtual friction model; and calculating a target steering torque on the basis of a virtual steering system model using the frictional torque of the column as a parameter.

Abstract: An aerosol generating system may include a plurality of susceptors having different resonance frequencies and configured to heat different portions of a cigarette accommodated in an aerosol generating device, a coil configured to heat the plurality of susceptors, a plurality of capacitors connected to the coil, and a processor configured to determine a combination of capacitors through which current applied to the coil is to pass from among the plurality of capacitors, and heat a susceptor corresponding to a resonance frequency according to the combination by applying current to the coil according to the combination.

Abstract: Provided herein are a liquid cartridge with an improved liquid supply ability and an aerosol generation device including the same. The liquid cartridge according to some embodiments of the present disclosure includes a storage portion which is configured to store an aerosol-generating substrate in a liquid state and includes an air hole through which air enters, a wick which is configured to absorb the stored aerosol-generating substrate, and a vaporizing portion which is configured to vaporize the aerosol-generating substrate absorbed through the wick to generate an aerosol. In the liquid cartridge, an inflow of air into the storage portion is facilitated through the air hole so that an internal pressure of the storage portion is prevented from dropping due to a decrease in the amount of the liquid, and positions where bubbles are generated are dispersed so that formation of bubble layers in the vicinity of the wick is also prevented.

Abstract: A vaporizer and an aerosol-generating device including the vaporizer are provided. The vaporizer includes a liquid storage tank configured to store a liquid aerosol-generating material, and a wick-heater assembly including a porous wick that absorbs the stored aerosol-generating material through a porous body and a heater assembly that generates an aerosol by heating the absorbed aerosol-generating material.

Abstract: Provided herein is an aerosol generation device with a reduced preheating time. The aerosol generation device according to some embodiments of the present disclosure includes a case including an opening formed in one surface, and an article insertion portion into which an aerosol-generating article including an aerosol-generating substrate is inserted, an opening/closing type cover which is disposed on the one surface of the case to open and close the opening, and a heater configured to heat the inserted aerosol-generating article. Here, the opening/closing type cover is configured to, when closing the opening, mechanically press an aerosol-generating substrate portion of the inserted aerosol-generating article so that the entire aerosol-generating substrate portion is rapidly heated, and in this way, a preheating time of the device may be reduced.

Abstract: Provided herein are a vaporizer and an aerosol generation device including the same. The vaporizer according to some embodiments of the present disclosure includes a porous wick configured to absorb an aerosol-generating substrate in a liquid state through a porous body, and a heating element which includes a heating pattern having a planar form that is embedded in the porous body and which is configured to heat the absorbed aerosol-generating substrate by the heating pattern to generate an aerosol. Since the heating pattern is embedded at a predetermined depth from a surface of the porous body, the amount of generated aerosol may be increased, and the risk of damage to the wick and the carbonization phenomenon may be reduced.

Abstract: As an embodiment of the present disclosure, there is disclosed an aerosol generating device including: a heater configured to generate an aerosol by heating an aerosol generating substrate; a storage unit configured to store information regarding a first time period and a second time period for controlling a temperature of the heater; and a controller configured to control power supplied to the heater, wherein the controller, when the first time period time elapses after the temperature of the heater reaches the first target temperature, changes the temperature of the heater to a second target temperature for the second time period, and the sum of the first time period and the second time period is a time period in a preset change.

Abstract: An aerosol generating device measures a current temperature of a heater before power is supplied to the heater that heats an aerosol generating material, and sets a preheating completion parameter, based on the measured current temperature of the heater, and a value of an amount of heat required to be supplied to the aerosol generating material to generate an adequate amount of aerosol. The aerosol generating device controls power supplied to the heater, based on the preheating completion parameter, such that a value of an amount of heat supplied to the aerosol generating material by the heater reaches the value of the amount of heat required to be supplied to the aerosol generating material.

Abstract: A heater assembly includes a heating layer having at least a portion including a susceptor material generating heat by an external magnetic field and having a cylindrical shape therein in which an accommodation space configured to accommodate the cigarette is formed, an insulating layer surrounding at least a portion of an outer side surface of the heating layer, and a sensor pattern embedded in the insulating layer and configured to measure a temperature.

Abstract: A motor driven power steering control method may include setting a virtual steering system model including a column connecting a steering wheel to a rack gear, determining a column stiffness torque using torsional displacement of the column in the set virtual steering system model, and determining a target steering torque based on the determined column stiffness torque.

Abstract: A motor driven power steering control method may include setting a virtual friction model to a column connected between a steering wheel and a rack gear; calculating a frictional torque of the column by taking a steering angular speed of the steering wheel as an input parameter in the set virtual friction model; and calculating a target steering torque on the basis of a virtual steering system model using the frictional torque of the column as a parameter.

Abstract: An aerosol generation system includes a tobacco medium accommodation portion and a moisturizer accommodation portion located at an upstream end or a downstream end of the tobacco medium accommodation portion. In addition, an aerosol generation system includes an aerosol generation device including an elongated cavity for accommodating the cigarette, a first heater for heating the tobacco medium accommodation portion, and a second heater for heating the moisturizer accommodation portion.

Abstract: Provided is a method for transmitting a packet in a communication system, comprising the steps of: identifying the packet according to a packet identification criterion; reallocating frames included in the identified packet and encrypting the packet in which the frames have been rearranged; and transmitting the encrypted packet.