Abstract: a method and an apparatus for managing a cache for storing content by determining popularity of the content based on content requests received during a current time slot for the content; transmitting information about the popularity of the content to a time-to-live (TTL) controller and receiving, from the TTL controller, TTL values for each popularity level determined by the TTL controller based on the information about the popularity; and managing the content based on the TTL values for each popularity level are provided.

Abstract: a method and an apparatus for managing a cache for storing content by determining popularity of the content based on content requests received during a current time slot for the content; transmitting information about the popularity of the content to a time-to-live (TTL) controller and receiving, from the TTL controller, TTL values for each popularity level determined by the TTL controller based on the information about the popularity; and managing the content based on the TTL values for each popularity level are provided.

Abstract: A method and apparatus provides a multi-screen based multi-dimensional game service using a home network and a home server. The method includes determining a resolution of a game screen to be served based on terminal information provided from a user terminal, storing a view on a user location in a multi-dimensional shared game space as a game session, generating an object for the view based on the determined resolution, performing multi-view rendering using multi-dimensional scene data and a user game input, capturing video and audio generated through the multi-view rendering, encoding the captured video and audio, and transmitting encoded video and audio to the user terminal.

Abstract: An apparatus for constructing device information for control of smart appliances includes a camera member, which generates multi-view images for 3D reconstruction through multi-angle photographing in an indoor space using a depth camera, and generates 3D data using the generated multi-view images, and a home device controller, which constructs a 3D space using the generated 3D data, and constructs a device profile for controlling an operation of a device to be controlled, which is designated by a user, through combination of spatial data of the device to be controlled and the constructed 3D space.

Abstract: A system for providing virtual AV service includes a local device middleware (LDM) media server which stores AV contents and a resource cooperation server (RCS) which separates the AV contents from the LDM media server into video contents and audio contents. The video contents and the audio contents are reproduced by an LDM video renderer and an LDM audio renderer, respectively. An LDM control point (LDMCP) controls the LDM media server and the LDM media renderers using the LDM protocol and a virtual device ensembler (VDE) controls the RCS and the LDMCP.

Abstract: A method for providing collaboration services and a collaboration agent device for implementing the method, which allows the collaboration agent devices to handle common functions necessary for the collaboration services and the applications to indirectly interact with each other using the collaboration agent devices so that applications running executed in two or more smart devices can provide the collaboration services in collaboration with each other.

Abstract: A system for providing virtual AV service includes a local device middleware (LDM) media server which stores AV contents and a resource cooperation server (RCS) which separates the AV contents from the LDM media server into video contents and audio contents. The video contents and the audio contents are reproduced by an LDM video renderer and an LDM audio renderer, respectively. An LDM control point (LDMCP) controls the LDM media server and the LDM media renderers using the LDM protocol and a virtual device ensembler (VDE) controls the RCS and the LDMCP.

Abstract: A method and apparatus provides a multi-screen based multi-dimensional game service using a home network and a home server. The method includes determining a resolution of a game screen to be served based on terminal information provided from a user terminal, storing a view on a user location in a multi-dimensional shared game space as a game session, generating an object for the view based on the determined resolution, performing multi-view rendering using multi-dimensional scene data and a user game input, capturing video and audio generated through the multi-view rendering, encoding the captured video and audio, and transmitting encoded video and audio to the user terminal.

Abstract: The present invention discloses a method of distributing files over a network, which can attain a proper balance of transfer rates of active spanning trees used between a transmitting node and a receiving node and minimize the time taken for transferring a large file in a P2P (Peer-to-Peer) environment by forming an optimal set of distribution trees with reference to the link costs between the transmitting node and the receiving node and distributing chunk files through the optimal set of distribution trees. The method comprises the steps of: forming a set of spanning trees between a transmitting node and a receiving node and forming a minimum cost tree group by the sum of the link costs of links constituting each of the spanning trees; adjusting the transfer rate of each spanning tree belonging to the minimum cost tree group in accordance with the link cost of each spanning tree belonging to the minimum cost tree group; and transferring chunk files through the spanning trees whose transfer rate is adjusted.

Abstract: An apparatus and method for managing and controlling UPnP devices in a home network over an external Internet network. The apparatus comprises a client connected to the external Internet network, and a UPnP proxy server for controlling and managing the UPnP devices in the home network. The client includes a stub for providing the same application program interface (API) as a UPnP API to a user, managing information of the UPnP devices and processing a device control command from the user, and a push client for transferring the device control command processed by the stub to the UPnP proxy server and an event message from the UPnP proxy server to the stub, respectively.

Abstract: An apparatus and method for managing and controlling UPnP devices in a home network over an external Internet network. The apparatus comprises a client connected to the external Internet network, and a UPnP proxy server for controlling and managing the UPnP devices in the home network. The client includes a stub for providing the same application program interface (API) as a UPnP API to a user, managing information of the UPnP devices and processing a device control command from the user, and a push client for transferring the device control command processed by the stub to the UPnP proxy server and an event message from the UPnP proxy server to the stub, respectively.

Abstract: An apparatus and method for managing and controlling UPnP devices in a home network over an external Internet network. The apparatus comprises a client connected to the external Internet network, and a UPnP proxy server for controlling and managing the UPnP devices in the home network. The client includes a stub for providing the same application program interface (API) as a UPnP API to a user, managing information of the UPnP devices and processing a device control command from the user, and a push client for transferring the device control command processed by the stub to the UPnP proxy server and an event message from the UPnP proxy server to the stub, respectively.

Abstract: An apparatus and method for managing and controlling UPnP devices in a home network over an external Internet network. The apparatus comprises a client connected to the external Internet network, and a UPnP proxy server for controlling and managing the UPnP devices in the home network. The client includes a stub for providing the same application program interface (API) as a UPnP API to a user, managing information of the UPnP devices and processing a device control command from the user, and a push client for transferring the device control command processed by the stub to the UPnP proxy server and an event message from the UPnP proxy server to the stub, respectively.