Abstract: The present invention relates to an apparatus and method for encoding and decoding an image by skip encoding. The image-encoding method by skip encoding, which performs intra-prediction, comprises: performing a filtering operation on the signal which is reconstructed prior to an encoding object signal in an encoding object image; using the filtered reconstructed signal to generate a prediction signal for the encoding object signal; setting the generated prediction signal as a reconstruction signal for the encoding object signal; and not encoding the residual signal which can be generated on the basis of the difference between the encoding object signal and the prediction signal, thereby performing skip encoding on the encoding object signal.

Abstract: There is provided a wireless communication device capable of providing two-way communication while minimizing the consumption of power so as to be continuously operable for a long period of time simply with battery power, without the aid of a constant power source. The wireless communication device includes: a wireless network interface connected to an access point (AP), which provides wireless local area network (WLAN) access; and a session maintenance packet transmission controller controlling the wireless network interface to repeatedly transmit a session maintenance packet, wherein the session maintenance packet includes a MAC keep-alive message, an address resolution protocol (ARP) response message, and a hole punching message.