Abstract: A method and apparatus for a wireless network to maintain a QOS is provided. The apparatus includes a resource calculating unit which calculates resources needed to transmit packets if a transmission rate of a network changes, a comparing unit which compares the calculated resources and resources allotted by an access point of the network; and a control unit which determines whether to request additional resources by using a result of the comparison by the comparing unit.

Abstract: There is provided an apparatus for recording/reproducing data on/from a recording medium including: a pickup unit including an objective lens and a solid immersion lens(SIL) to allow a light to be incident onto a recording medium; a photoelectric element for receiving the light reflected from the recording medium to output a controlling signal; and a controller to control the pickup unit using the controlling signal outputted from the photoelectric element, wherein the controlling signal includes a tilting error signal by skew of the recording medium.

Abstract: An access device and method for preventing transmission of copyrighted contents to an external network and a method for the same. The access device includes a packet-header analyzer analyzing a header of a packet received from a home network device, a copyrighted-content sensor detecting whether the packet includes copyrighted content as a result of the analysis, an address converter for converting a packet source IP address into an IP address supported by the external network if a packet destination address is an external network address as a result of the analysis, a mapping-table generator generating a mapping table for managing a mapping a relationship between the packet source IP address and the converted IP address, and a packet transmitter transmitting the packet to the IP address supported by the external network and discarding the packet to block transmission of the copyrighted content to the external network if the copyrighted-content sensor detects that the packet includes the copyrighted content.

Abstract: A method for reproducing an optical recording medium includes: determining a kind of optical pick-up device placed to reproduce an optical recording medium; detecting a push-pull signal or a pre-pit signal of an inserted recording medium according to the kind of optical pick-up device; and reproducing the optical recording medium by using an optical pick-up device from which the push-pull signal or the pre-pit signal is detected.

Abstract: An apparatus and/or system implements a method for storing and reproducing contents received through broadcast signals, where the method of managing content includes reconstructing a broadcast signal received from a broadcasting company, transmitting a content ID and predetermined authentication information to the broadcasting company, the content ID used to discriminate content contained in the broadcast signal, receiving content management information including a content key corresponding to the content ID from the broadcasting company, encrypting the content using the content key, and storing the encrypted content in a content storage apparatus.

Abstract: A data transmission method and a data transmission system using an improved network address translation method. The data transmission method includes requesting a real-time service from a multimedia device to a home gateway within a home network; inputting a binary code corresponding to the multimedia device to a service type field indicating priority information of data when the home gateway forms a mapping table used for conversion of addresses; the home gateway requesting setting of an IP address of the multimedia device from a service provider; setting the IP address including the binary code corresponding to the multimedia device according to the request of setting the IP address; and the service provider transmitting a data packet including the binary code corresponding to the multimedia device. The method is applied to the selective IP packet, thereby shortening the transmission time of real-time data packets for multimedia.

Abstract: A system where a home server can recognize a location of a home device in a home network. The home device includes a Radio Frequency Identification (RFID) tag which stores information about the home device, and each plug receptacle constituting the home network has an RFID reader. Accordingly, the RFID reader checks the location of the RFID tag in real time and transfers the information about the RFID tag and a receptacle identifier to a home server, so that the home server recognizes the location of the home device in real time using the information transferred. Therefore, using the transferred information, the home server can recognize in real-time the location of the home device, and also transfer necessary information to the home device.

Abstract: A home-network and a method for allocating channels are provided. The home-network includes a buffer having queues and temporarily storing a data to be transmitted to each device, a priority sense part determining if the data of a packet unit transmitted from an outer server has a high priority for transmission and first inputting the data with a high priority into the queue of the buffer, a frame sense part sensing how many packets are included in one frame of the data stored in the buffer, and a channel allocation part allocating channels if enough channels are available for the transmission of a whole frame according to the number of packets sensed by the frame sense part. Accordingly, it is possible to reduce a delay time of wireless data, and channels are allocated according to the order of receipt of the data such that all devices perform equally.

Abstract: There is provided an optical reading/writing apparatus. The optical reading/writing apparatus includes an object lens barrel for mounting an object lens, an SIL (solid immersion lens) barrel for mounting an SIL, the SIL barrel being separated from the object lens barrel, and a movement control unit for selectively aligning the SIL with the object lens according to a type of an optical storage medium.

Abstract: Disclosed are an apparatus and a method for controlling a tracking servo in a near field optics. Gap error signals are detected in a divided state, and a push pull signal is compensated based on the detected gap error signals. A photo detector detecting the gap error signals is divided into two areas such that movement of an image formed on the photo detector can be detected. The push pull signal is compensated by subtracting a value proportional to a difference value between the two gap error signals detected in the photo detector. The difference value between the two gap error signals is proportional to a dc offset component included in the push pull signal. Accordingly, it is possible to simply remove a dc offset included in a push pull signal without largely modifying the near field optics, so that it is possible to exactly perform a tracking servo operation.

Abstract: A wireless audio transmission/reception system is provided. The transmission/reception system includes an FM detector for detecting an occupied channel among radio FM channels, a microprocessor for selecting a using channel that is greatly different in frequency from the detected occupied channel and thus does not interfere therewith, an FM transmitter built in an audio replay system to transmit/receive an audio signal over the using channel, and an external audio system for receiving and outputting the audio signal from the FM transmitter.

Abstract: A print apparatus including a photoconductive drum, a laser scanning unit (LSU) to scan a surface of the photoconductive drum, and an image processing unit to generate and output dot size information corresponding to externally input image data. The dot size information determines sizes of individual dots on an image to be printed, a memory unit to store dot size compensation values related to a scanning distance of laser beams emitted from the LSU to the surface of the photoconductive drum to the LSU. The compensation values change the dot size information. The apparatus further includes a light intensity difference compensation unit to compensate for the dot size information according to the stored compensation values if the dot size information is received, and a pulse width modulation (PWM) unit to generate and output a pulse signal to control the scanning of the laser beams of the LSU according to the compensated dot size information.

Abstract: A high-density read-only optical disc, and an optical disc apparatus and method using the same. The apparatus and method record data on a lead-in area of a high-density read-only optical disc such as a BD-ROM (Blu-ray disc ROM (Read Only Memory)) in the form of pre-pit strings associated with an HFM (High-Frequency Modulated) groove applied to a BD-RW (Blu-ray Disc Rewritable). Moreover, the apparatus and method continuously apply the same tracking servo operation to an entire area of the same high-density read-only optical disc or rewritable optical disc. Therefore, the apparatus and method can simplify an algorithm for controlling a plurality of tracking servo operations, and avoid an increased size of the optical disc apparatus.

Abstract: A wireless local area network system capable of supporting host mobility services and an operation method therefor are disclosed. The wireless local area network system includes a gateway performing the functions of a home agent in mobile wireless communication environments and sending prefix information; and access points, each access point allocating an Internet Protocol (IP) address to a mobile host within a range thereof by using prefix information of the gateway. Thereafter, each access point produces and sends a Binding Update list that corresponds to the mobile hosts to the gateway. Thus, the present invention supports the mobility for mobile hosts with or without a mobile IPv6 stack, in a wireless local area network.

Abstract: A wireless communication system to support real time service and handoff method thereof. A plurality of mobile management units having a plurality of visitor management units perform a handoff based on the movement of a mobile communication unit. One or more visitor management unit is a common visitor management unit that is included in a network constructed by the plurality of mobile management units. When the mobile communication unit moves to another visitor management unit of the same mobile management unit, the mobile management unit including the mobile communication unit updates the mobility information to provide a real time service path between the information providing unit and the mobile communication unit. When the mobile communication unit moves to a different mobile management unit, the common visitor management unit requests another mobile management unit for registration of the mobile communication unit, thereby making a reservation for a real time service path.