Abstract: There are provided a system and method for providing a virtual desktop service using a cache server. A system for providing a virtual desktop service according to the invention includes a host server configured to provide a virtual desktop service to a client terminal using a virtual machine, a distributed file system configured to store data for the virtual machine, and a cache server that is provided for each host server group having at least one host server, and performs a read process or a write process of data using physically separate caches when the read process or write process of the data is requested from the virtual machine in the host server.

Abstract: A multicast routing apparatus in a wireless mesh network and a method thereof are disclosed. The multicast routing apparatus in the wireless mesh network includes: an information obtaining unit configured to obtain group identification (ID) information of neighboring mesh stations corresponding to the respective mesh stations; a selecting unit configured to select a multicast forwarding candidate corresponding to a candidate of the mesh stations capable of participating in forwarding multicast data packet using the group ID information; a tree generating unit configured to generate a tree corresponding to a transmission path of the multicast data packet; and a packet transmitting unit configured to transmit data packet from a transmitting mesh station to a receiving mesh station of the mesh stations using the tree.

Abstract: An apparatus and a method for synchronizing left and right streams in a stationary/mobile hybrid 3DTV are disclosed. The apparatus according to an exemplary embodiment may synchronize content streams corresponding to left and right images using a timestamp pairing mode, a timestamp offset mode, and a network time protocol (NTP) synchronization mode.

Abstract: In a content network over which a plurality of smart nodes is coupled, each smart node receives advertisement messages broadcasted by adjacent smart nodes. The advertisement message may be one of a link state advertisement (LSA) message including link state information indicative of a link that is a network interface, a server state advertisement (SSA) message including server state information indicative of a data storage state and a processing state of a processing unit of the smart node, and a content state advertisement (CSA) message including content state information indicative of content stored in the smart node. Each smart node updates its own database based on the information included in the received advertisement message.

Abstract: Disclosed are a method for delivering emergency traffic in a SDN based network and an apparatus performing the same. A method for delivering emergency traffic, performed in a controller, may comprise generating an emergency code for delivering the emergency traffic when an emergency state corresponding to a predefined type occurs; transmitting the emergency code to a first OpenFlow switch connected to a transmitting terminal transmitting the emergency traffic; and transmitting a message directing an update of the emergency code to at least one OpenFlow switch included in a forwarding path of the emergency traffic. Therefore, when an emergency state occurs in a network, emergency traffic corresponding to the emergency state may be delivered efficiently, and stabilities of network management and service qualities may be guaranteed accordingly.

Abstract: An apparatus and method for controlling a BSS area are disclosed. The apparatus includes a generation unit, a coordinate extraction unit, a calculation unit, a path loss calculation unit, a characteristic classification unit, a transmitted signal strength calculation unit, and a control unit. The generation unit receives SSIDs, and generates a collected device list. The coordinate extraction unit extracts the coordinates of an SSID corresponding to a specific location beacon device. The calculation unit calculates a straight-line distance between the specific location beacon device and another location beacon device. The path loss calculation unit calculates a measured path loss value. The characteristic classification unit classifies the characteristic of a link. The transmitted signal strength calculation unit calculates transmitted signal strength. The control unit performs control so that a location beacon device other than the specific location beacon device is prevented from operating in a BSS area.

Abstract: Provided is a method and apparatus for efficient aggregation scheduling in a wireless local area network (WLAN) system, the apparatus including a delay setting unit to set a required delay time for each access category (AC), a storing unit to store a traffic identification (TID) of a packet in a queue of a corresponding AC when the packet arrives, a delay time calculator to calculate a maximum delay time predicted when the packet arriving at the queue is configured to be an A-MPDU and the configured A-MPDU is transmitted, and an A-MPDU configuring unit to compare the calculated maximum delay time and the required delay time, and configure a corresponding A-MPDU when the calculated maximum delay time is greater than the required delay time.

Abstract: Disclosed is a method of estimating a position by a position estimation system. The method includes generating a time-synchronization signal for position determination using a genetic algorithm, embedding the generated time-synchronization signal in an audio signal, and replaying the audio signal embedded with the time-synchronization signal through a speaker, receiving the audio signal embedded with the time-synchronization signal in a microphone, calculating a time delay value of the time-synchronization signal embedded in the received audio signal, and estimating a position of the microphone based on the calculated time delay value.

Abstract: A multi-layer link management device, a multi-layer integrated network transport system, and a multi-layer link management method are provided. The multi-layer link management device according to an embodiment of the present invention establishes a traffic engineering link stack integrated into one control plane in a multi-layer network, performs real-time monitoring and integrative management on link failure and performance for each layer, and notifies a neighbor node of failure and performance degradation states of a multi-layer link and integratedly manages the failure and performance degradation states. Thus, it is possible to enhance reliability of a multi-layer network and monitor failure and performance degradation in real time, thereby allowing quick performance diagnosis and management of a system and shortening a path protection switching time.

Abstract: Provided is a method of estimating a channel based on signal field channel information in a wireless local area network (WLAN) system, the method including acquiring a first complex storage value based on training field channel information, acquiring a second storage value based on the signal field channel information, setting a first signal and a second signal based on the first complex storage value and the second complex storage value, and generating an output signal based on the first signal and the second signal.

Abstract: Provided are a digital hologram synthesis method and apparatus based on an angular spectrum. The digital hologram synthesis method includes representing an input digital hologram as at least one angular spectrum region by applying Fourier transformation to the input digital hologram, registering the at least one angular spectrum region by projecting the at least one angular spectrum region onto a spherical surface, and generating a synthesis digital hologram based on the registered at least one angular spectrum region. Accordingly, it is possible to generate a new digital hologram with a different orientation or at a different distance using an angular spectrum of a digital hologram generated in advance, without geometric information of an object. In addition, it is possible to readily and intuitively synthesize a new digital hologram while viewing an image visualized in a 3D space.

Abstract: Disclosed are a data offloading apparatus and method. The data offloading apparatus according to an embodiment of the present invention includes an analysis unit configured to analyze a type of a packet and a provision unit configured to provide the packet to an Internet network through a mobile core network or through a route of bypassing the mobile core network on the basis of the type of the packet. According to the present invention, a terminal can transmit data to the Internet network through the mobile core network or the route of bypassing the mobile core network according to characteristics of the data.

Abstract: A method provides an identifying OFDM communication signal using OFDM symbol estimation. In view of the above, the present invention provides an apparatus and method for identifying an OFDM communication signal using an OFDM symbol estimation, which is capable of analyzing the OFDM signal with a high accuracy in a cognitive radio technique, thereby identifying the OFDM signal from a heterogeneous communication signal.

Abstract: Provided is a system for predicting production of a fruit tree, including a plant image obtaining unit collecting images of a fruit tree and confirming identification information about the fruit tree from the collected images, a branch pattern recognizing unit receiving an image of the fruit tree whose identification information is confirmed and extracting fruit bearing branches from among various kinds of branches belonging to the fruit tree, a fruit tree bud recognizing unit receiving an image of each of the extracted fruit bearing branches and extracting information about buds that fruits are actually to be born from among buds belonging to the fruit bearing branch, a meta database storing previous production predicting information about the fruit tree corresponding to the collected images, and a production estimating unit comparing the received bud information and the previous production predicting information to predict production of the fruit tree.

Abstract: Provided are a projector that projects a pattern for user motion recognition and a motion recognition apparatus and method using the projector. The projector includes a light generation unit, a light guide unit configured to guide light generated from the light generation unit in a predetermined direction, a collimating lens configured to collimate the light transmitted from the light guide unit, and a diffractive optical element (DOE) configured to generate the pattern using the light passing through the collimating lens. In addition, the motion recognition apparatus includes a projector configured to project a pattern, a camera configured to photograph the projected pattern to generate an image including depth information, and a control unit configured to recognize a motion of a user using the image including the depth information and carry out a command corresponding to the recognized motion of the user.

Abstract: An apparatus for displaying hyperlinks using keywords and a method thereof are disclosed. The apparatus for display the hyperlinks using the keywords includes: a hyperlink list generating unit configured to collect hyperlinks included in a web document, select a target hyperlink among the hyperlinks, and generate a hyperlink list including the selected target hyperlink; a keyword list generating unit configured to select keywords corresponding the respective hyperlinks included in the hyperlink list and generate a keyword list including the keywords; and a control widget displaying unit configured to display the keywords following the hyperlink according to an input of a user in a control widget.

Abstract: A metadata server of a distributed file system calculates an access frequency of a file and changes a maintaining method of chunks of a data server for dividing data of the file into chunk units to store the chunks in a stripe in accordance with access frequency of the file.

Abstract: Disclosed is a packet processing method in a below binary stack (BBS) structure. A transmission packet processing method includes receiving a packet from a network layer, reassembling a packet for which a first fragmentation has been performed when the received packet is the packet for which the first fragmentation has been performed, encrypting the reassembled packet, performing a second fragmentation for the encrypted packet when the second fragmentation is necessary for the encrypted packet, adding a header to the packet for which the second fragmentation has been performed, and transmitting the packet with the header added thereto through a physical layer. Accordingly, an encryption function can be provided in the BBS structure.

Abstract: An apparatus and a method for measuring a position of a light are disclosed. The apparatus for measuring a position of a light includes: an inputting unit configured to receive position information on a building and a floor in which a user is positioned; a position coordinate calculating unit configured to measure distances between a position of the user and wall surfaces in the building in each direction and calculate a position coordinate of the user based on the distances in each direction; a position determining unit configured to apply the position coordinate to a plan view corresponding to the position information to determine an initial position of the user; and a position information combining unit configured to receive a light identifier depending on movement of the user and store position information of the light corresponding to the light identifier.

Abstract: A digital signage system and a method of providing information using the digital signage system are disclosed. The digital signage terminal includes an emergency detection unit, an emergency detection message generation unit, a communication unit, and an emergency alert message processing unit. The emergency detection unit collects the surrounding emergency-related information of the digital signage terminal. The emergency detection message generation unit generates an emergency detection message including the collected emergency-related information. The communication unit transmits the generated emergency detection message to a digital signage server, and receives an emergency alert message including an emergency alert corresponding to an emergency situation from the digital signage server. The emergency alert message processing unit parses the emergency alert message, and provides the emergency alert included in the emergency alert message to a user.