Abstract: A separator damage detecting apparatus detects a separator damage of a secondary battery by applying a voltage while pressing an electrode assembly having a structure in which a positive electrode plate, a separator and a negative electrode plate are stacked, to induce a temporary short circuit of a positive electrode plate and a negative electrode plate. The separator damage detecting apparatus includes a short circuit measuring unit configured to apply a voltage to the electrode assembly and detect a leakage current; and a pressing jig configured to roll-press at least one surface of the electrode assembly or consecutively press predetermined regions of the at least one surface of the electrode assembly.

Abstract: Disclosed is a separator damage detecting apparatus. The separator damage detecting apparatus detects a separator damage of a secondary battery by applying a voltage while pressing an electrode assembly having a structure in which a positive electrode plate, a separator and a negative electrode plate are stacked, to induce a temporary short circuit of a positive electrode plate and a negative electrode plate. The separator damage detecting apparatus includes a short circuit measuring unit configured to apply a voltage to the electrode assembly and detect a leakage current; and a pressing jig configured to roll-press at least one surface of the electrode assembly or consecutively press predetermined regions of the at least one surface of the electrode assembly.

Abstract: Provided is an earphone for eliminating the influence of external noise.

Abstract: A device and method of optimizing data communication, are discussed. In an embodiment of the method, encrypted authentication is performed to transmit and receive encrypted data to and from a display device after a default delay time has elapsed in a state in which a source device and the display device are connected to each other. If it is determined that the authentication has failed, the encrypted authentication is performed again after an additional delay time or a delay time stored in conjunction with the display device has elapsed. If it is determined that the authentication has succeeded, a required delay time in conjunction with the display device is stored or updated. Thus, the delay time, which is required before the establishment of data communication, can be optimized in consideration of the characteristics of a device connected to perform the data communication.

Abstract: A device and method of optimizing data communication, are discussed. In an embodiment of the method, encrypted authentication is performed to transmit and receive encrypted data to and from a display device after a default delay time has elapsed in a state in which a source device and the display device are connected to each other. If it is determined that the authentication has failed, the encrypted authentication is performed again after an additional delay time or a delay time stored in conjunction with the display device has elapsed. If it is determined that the authentication has succeeded, a required delay time in conjunction with the display device is stored or updated. Thus, the delay time, which is required before the establishment of data communication, can be optimized in consideration of the characteristics of a device connected to perform the data communication.