Abstract: A skin care device using multiple composite laser pulses according to an embodiment of the present disclosure includes: a laser generating unit including an energy portion configured to supply energy, a light emission portion configured to generate light by absorbing the energy supplied from the energy portion, a first mirror and a second mirror configured to form a resonance path in which the light generated from the light emission portion is amplified, a polarizing portion disposed on an optical resonant path between the first mirror and the second mirror and configured to polarize the light, and a first switch and a second switch configured to convert a polarization component of an incident polarized light; and a control unit configured to control the first switch and the second switch so that the laser generating unit operates in a single laser pulse mode or a multiple laser pulse mode.

Abstract: A networking system for a refrigerator in which a network module available for both wireless and wire accesses to the network over the Internet is built, thereby allowing an access to an other network over the Internet and constructing a home network, the networking system able to be easily upgraded, and a method of upgrading the networking system.

Abstract: A networking system for a refrigerator in which a network module available for both wireless and wire accesses to the network over the Internet is built, thereby allowing an access to an other network over the Internet and constructing a home network, the networking system able to be easily upgraded, and a method of upgrading the networking system.