Abstract: A system, apparatus and method to control the output of a radio frequency signal in a wireless local area network (LAN) system having an infrastructure. The system includes an access point which periodically transmits a frame including output control information used to control the output of the radio frequency signal, and a wireless terminal apparatus including a wireless transceiver module which receives the frame and a control module which extracts the output control information from the received frame, and controls the output of the radio frequency signal by the wireless transceiver module according to the extracted output control information.

Abstract: A network system including a host having a first network module, and a first controller checking a data transmitting/receiving state of the first network module and outputting operation state data corresponding to the data transmitting/receiving state through the first network module, and a client having a display, a second network module connected to the host and receiving the operation state data from the host, and a second controller controlling the display to display information about the data transmitting/receiving state of the first network module of the host on the basis of the operation state data received through the second network module. With this configuration, embodiments of the present invention provide a computer, an access point, a network system and a control method thereof, where a host can provide data about its data transmitting/receiving state to a client, thereby allowing a user to check the data transmitting/receiving state of the host.

Abstract: A portable Internet service system includes a plurality of terminals which transmit uplink data for performing wireless communication; and a base station which receives the uplink data from the plurality of terminals, transmits downlink data to the plurality of terminals, and establishes a peer-to-peer function to perform a peer-to-peer transmission between the plurality of terminals.

Abstract: A method and apparatus to provide guidance to be associated with a stable access point using a previous connection history, the method includes receiving data from a plurality of access points which are available in a wireless network and searching connection information related to a connection history corresponding to the respective access point using an identifier of respective access point included in the received data; selecting a first access point which can be used to preferentially connect to the wireless network among the plurality of access points according to a predetermined standard and outputting a guide information of the first access point; connecting to the wireless network through the first access point; and storing connection information including results of a transmission and/or receipt of the data.

Abstract: A network system including a host having a first network module, and a first controller checking a data transmitting/receiving state of the first network module and outputting operation state data corresponding to the data transmitting/receiving state through the first network module, and a client having a display, a second network module connected to the host and receiving the operation state data from the host, and a second controller controlling the display to display information about the data transmitting/receiving state of the first network module of the host on the basis of the operation state data received through the second network module. With this configuration, embodiments of the present invention provide a computer, an access point, a network system and a control method thereof, where a host can provide data about its data transmitting/receiving state to a client, thereby allowing a user to check the data transmitting/receiving state of the host.

Abstract: A system, apparatus and method to control the output of a radio frequency signal in a wireless local area network (LAN) system having an infrastructure. The system includes an access point which periodically transmits a frame including output control information used to control the output of the radio frequency signal, and a wireless terminal apparatus including a wireless transceiver module which receives the frame and a control module which extracts the output control information from the received frame, and controls the output of the radio frequency signal by the wireless transceiver module according to the extracted output control information.

Abstract: A wireless network system including a station, a plurality of access points to which the station is accessible, an access speed detector provided to each access point to detect access speed of a station registered to the access point, and a network controller provided to the station, to receive information in relation to the access speed from the access point and to control the station to be registered to the access point that provides optimum access speed based on the received information in relation to the access speed. Accordingly, the present invention provides a wireless network system and a method of registering a station in which the station is registered to an access point that provides optimum access speed and/or optimum signal intensity among a plurality of accessible access points, to thereby improve network efficiency.

Abstract: A portable computer has a wireless communication part receiving and transmitting a wireless signal through a wireless communication service network, a displaying part, and a selection part to select whether to display a wireless accessibility to the wireless service network. A BIOS memory stores a network accessing routine determining the wireless accessibility based on the wireless signal received by the wireless communicating part. A controller controls a power supplying part to supply power to the displaying part, the wireless communication part and the BIOS memory, thereby executing the network accessing routine, while the power to the portable computer is turned off, to provide the wireless accessibility, for example, by displaying it in the displaying part, according to the selection to display the wireless accessibility. The availability for connecting to the wireless service network can be ascertained before the O/S booting, while the system power is turned off.

Abstract: A system for restoring a digital TV signal, comprising a signal dividing means receiving the digital TV signal, and dividing the digital TV signal into digital video signals and digital audio signals after a predetermined signal processing; a video decoding means decoding the digital video signals outputted from the signal dividing means into analog video signals, and outputting low frequency analog video signals by colors; an audio decoding means decoding the digital audio signals outputted from the signal dividing means into analog audio signals with a plurality of channels corresponding to predetermined frequencies; a plurality of frequency-modulators frequency-modulating the low frequency analog video signals and the analog audio signals, in response to intermediate frequencies, respectively; a computer system having a wireless transmitter wirelessly transmitting the signals modulated by the frequency-modulators; a plurality of wireless receivers wirelessly receiving the analog video and audio signals tra