Abstract: In a multi-source hybrid overlay network including a plurality of peers, an apparatus that recovers missing data occurring in a tree recovery process, acquires data that a peer does not have in a pull method through exchanging buffer maps with a first counterpart peer connected to a primary path recovered in the tree recovery process and at least one second counterpart peer connected to at least one candidate path, and provides data that the first counterpart peer does not have to the first counterpart peer in the push method, when a data recovery policy is a pull method, is provided.

Abstract: A peer may receive a peer list from a hybrid overlay management server in response to an overlay network participation request of the peer, may select a first peer from the received peer list, may establish a connection with the selected first peer, and may establish a connection with at least one of second peers. Propagation of the overlay network participation request may be initiated by the selected first peer, and each of the second peers may correspond to a peer that receives the propagated overlay network participation request. One of the established connections may be determined as a primary path, and a communication may be performed through the primary path.

Abstract: In a multi-source hybrid overlay network including a plurality of peers, an apparatus that recovers missing data occurring in a tree recovery process, acquires data that a peer does not have in a pull method through exchanging buffer maps with a first counterpart peer connected to a primary path recovered in the tree recovery process and at least one second counterpart peer connected to at least one candidate path, and provides data that the first counterpart peer does not have to the first counterpart peer in the push method, when a data recovery policy is a pull method, is provided.

Abstract: A peer may receive a peer list from a hybrid overlay management server in response to an overlay network participation request of the peer, may select a first peer from the received peer list, may establish a connection with the selected first peer, and may establish a connection with at least one of second peers. Propagation of the overlay network participation request may be initiated by the selected first peer, and each of the second peers may correspond to a peer that receives the propagated overlay network participation request. One of the established connections may be determined as a primary path, and a communication may be performed through the primary path.

Abstract: Disclosed is a display device connection method for rapidly delivering data to a plurality of display devices. A peer-to-peer (P2P) overlay network including the plurality of display devices as member peers is configured to distribute content. In this case, an overlay management server (OMS) connects first member peers through a network as a tree topology using a source peer providing the content as a root node, and transmits fragments of the content to a child peer based on a number of peers to which each of the member peers is capable of transmitting the fragments of the content for a preset period of time, and the source peer directly transmits the fragments of the content to a second member peer that is not included in the tree topology among the member peers based on a predetermined limit on a hop count.

Abstract: Disclosed herein are an in-network caching apparatus and method. The in-network caching method using the in-network caching apparatus includes receiving content from a second node in response to a request from a first node; checking a Conditional Leave Copy Everywhere (CLCE) replication condition depending on a number of requests for the content; checking a priority condition based on a result value of a priority function for the content; checking a partition depending on the number of requests for the content; performing a cache replacement operation for the content depending on a result of checking the partition for the content; and transmitting the content to the first node.

Abstract: Disclosed is a display device connection method for rapidly delivering data to a plurality of display devices. A peer-to-peer (P2P) overlay network including the plurality of display devices as member peers is configured to distribute content. In this case, an overlay management server (OMS) connects first member peers through a network as a tree topology using a source peer providing the content as a root node, and transmits fragments of the content to a child peer based on a number of peers to which each of the member peers is capable of transmitting the fragments of the content for a preset period of time, and the source peer directly transmits the fragments of the content to a second member peer that is not included in the tree topology among the member peers based on a predetermined limit on a hop count.

Abstract: Disclosed herein are an in-network caching apparatus and method. The in-network caching method using the in-network caching apparatus includes receiving content from a second node in response to a request from a first node; checking a Conditional Leave Copy Everywhere (CLCE) replication condition depending on a number of requests for the content; checking a priority condition based on a result value of a priority function for the content; checking a partition depending on the number of requests for the content; performing a cache replacement operation for the content depending on a result of checking the partition for the content; and transmitting the content to the first node.

Abstract: Provided is a cooperation method and a resource allocation method for cooperation between internet of things (IoT) devices, a cooperation method between IoT devices installed in an IoT-based smart greenhouse (ISG) including processing data related to a target command and data related to a decision condition, selecting at least one particular device according to the processed data related to the target command, grouping the at least one device according to additional information received from the selected device and the processed data related to the decision condition, transmitting a first execution instruction to each of the grouped devices, regrouping the at least one device according to additional information newly received from the selected device and the processed data related to the decision condition or newly received data related to a decision condition after the grouping, and transmitting a second execution instruction to regrouped device.

Abstract: Provided a proof of play (PoP) method of a digital signage terminal and a digital signage server, the PoP method of the digital signage terminal including obtaining a digital signature and a PoP message generation policy provided by a content owner, generating log data comprising information on a play of at least one piece of content, based on the PoP message generation policy, generating a PoP message using information on the digital signature based on the generated log data, and providing the PoP message to at least one of the digital signage server and the content owner.

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.

Abstract: A method and digital signage terminal for processing an interactive service using a digital signage system are disclosed. The digital signage terminal includes a device controller, a configuration manager, a device event receiver, an event data analyzer, and a registered event dispatcher. The device controller performs control so that the auxiliary device receives at least one event. The configuration manager receives a client configuration message, and extracts first event request information. The device event receiver receives raw data related to a first event. The event data analyzer converts the raw data into information related to the first event. The registered event dispatcher registers a second event based on the extracted first event request information, receives the information related to the first event, determines whether the first event corresponds to the registered second event, and generates determination information indicating that the first event corresponds to the second event.

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.

Abstract: Provided a proof of play (PoP) method of a digital signage terminal and a digital signage server, the PoP method of the digital signage terminal including obtaining a digital signature and a PoP message generation policy provided by a content owner, generating log data comprising information on a play of at least one piece of content, based on the PoP message generation policy, generating a PoP message using information on the digital signature based on the generated log data, and providing the PoP message to at least one of the digital signage server and the content owner.

Abstract: Disclosed is a mobile Internet protocol television (IPTV) system providing a supplementary service added to a broadcasting service. The mobile IPTV system includes a service guide server providing programming information of an additional service, a media server providing streaming of contents for a supplementary service, a supplementary service server providing control for the supplementary service, and a mobile IPTV management server performing user authentication for the supplementary service. In this case, the mobile IPTV management server, the media server, the service guide server and the supplementary service server are connected to each other via a dedicated wireless IP network.

Abstract: Provided is a method in which a tracker configures a notification condition on the basis of an authorization policy predetermined by a trackee so that a location information server provides a customized location tracking service according to the notification condition. The method includes: (a) registering an authorization policy of a trackee in order to determine whether a location tracking service requested by a tracker will be accepted; (b) configuring a customized location information notification condition by a tracker; (c) requesting the customized location tracking service by the tracker; and (d) providing the customized location tracking service by a location information server on the basis of the configured authorization policy and the customized location information notification condition.

Abstract: An information providing system includes: a service provider list provider that receives a service provider list requesting message for a service that a terminal device wants and transmits a service provider list information message including a service provider list including a service provider server providing the service to the terminal device; and a service list provider that receives a service list requesting message requesting a service details list provided by the service provider server included in the service provider list from the terminal device and transmits a service list information message including the service details list provided by the service provider server to the terminal device.

Abstract: A system for providing a session initiation protocol based conference service includes: a conference host terminal that produces requests to setup a call using identification information, to make a registration of participants to be invited to a conference session using a conference identifier, and to initiate the conference session using the conference identifier; a plurality of conference participant terminals as the participants that participate in the conference session; and a conference server having the identification information.

Abstract: Provided is a method in which a tracker configures a notification condition on the basis of an authorization policy predetermined by a trackee so that a location information server provides a customized location tracking service according to the notification condition. The method includes: (a) registering an authorization policy of a trackee in order to determine whether a location tracking service requested by a tracker will be accepted; (b) configuring a customized location information notification condition by a tracker; (c) requesting the customized location tracking service by the tracker; and (d) providing the customized location tracking service by a location information server on the basis of the configured authorization policy and the customized location information notification condition.

Abstract: Provided is a method in which a tracker configures a notification condition on the basis of an authorization policy predetermined by a trackee so that a location information server provides a customized location tracking service according to the notification condition. The method includes: (a) registering an authorization policy of a trackee in order to determine whether a location tracking service requested by a tracker will be accepted; (b) configuring a customized location information notification condition by a tracker; (c) requesting the customized location tracking service by the tracker; and (d) providing the customized location tracking service by a location information server on the basis of the configured authorization policy and the customized location information notification condition.