Abstract: A route determination device includes a memory and a processor configured to calculate, in a communication network including a plurality of nodes and edges connecting the nodes, weights of the edges using a plurality of parameters regarding the edges or the nodes; and determine a first route from a start point node to an end point node in the communication network based on the weights of the edges.

Abstract: A message relay apparatus and a message relay method that achieve high message reachability taking communication network situation into consideration are provided. A message relay apparatus 100 interposed between an application 20 and a device 30 includes a device communication state determination functional unit 131 that determines communication availability with the device 30, a network state estimation unit 133 that estimates a network state based on the communication availability, and a message processing unit 110 that determines forwarding availability of an application message based on the network state and buffers the application message when forwarding is not available.

Abstract: A wavelength defragmentation apparatus for executing wavelength reallocation for a path in an optical transmission network, the wavelength defragmentation apparatus comprising: a storage unit that stores a path information database (DB) and a wavelength allocation management DB; and a wavelength defragmentation functional unit that refers to an attribute of a path from the path information DB and performs wavelength reallocation of a path having the attribute by an operation corresponding to the attribute.

Abstract: A topology design device for an optical transmission network includes a memory; and a processor to determine a bypass target area as an area to which a bypass route is to be added in the network, the area indicating a region surrounded by nodes and edges, based on an area demand, namely a total value of a demand for communication to be performed via an edge, by referencing a topology management database storing information regarding nodes, edges, and areas in the network, and a demand management database storing demands in the network; and exclude a node from nodes constituting the bypass target area and determining a bypass route from the nodes from which the node has been excluded, based on a node demand, namely a total value of a demand for which each node serves as a start or end point of the demand, by referencing the databases.

Abstract: A local wavelength defragmentation apparatus performs wavelength defragmentation for at least one wavelength path passing through a target link in an optical transmission network. The local wavelength defragmentation apparatus includes a reallocation rank determination unit configured to calculate a remaining time from a present time to an abolition timing for each of the at least one wavelength path and determine rank for wavelength reallocation of the at least one wavelength path based on the remaining time; and a reallocation number determination unit configured to calculate utilization of at least one reallocatable wavelength number for each of the at least one wavelength path according to the rank, and determine a wavelength so that a wavelength of the wavelength number having the highest utilization is reallocated.

Abstract: A data transmission apparatus causes a computer to receive first data and second data, each of which has a different transmission destination, evaluate relevance between the first data and the second data, and transmit the first data and the second data to the respective transmission destinations, and the transmitting of the data further includes transmitting the first data to the transmission destination of the second data in accordance with evaluation results obtained in the evaluating of the relation, so that a diversity of the data that can be collected by the transmission destination of the data is increased.

Abstract: A topology design device for an optical transmission network includes a memory; and a processor to determine a bypass target area as an area to which a bypass route is to be added in the network, the area indicating a region surrounded by nodes and edges, based on an area demand, namely a total value of a demand for communication to be performed via an edge, by referencing a topology management database storing information regarding nodes, edges, and areas in the network, and a demand management database storing demands in the network; and exclude a node from nodes constituting the bypass target area and determining a bypass route from the nodes from which the node has been excluded, based on a node demand, namely a total value of a demand for which each node serves as a start or end point of the demand, by referencing the databases.

Abstract: A video management device includes a storage processing unit configured to store video data received through a network in a storage unit, a calculation unit configured to classify a video data group stored in the storage unit based on combinations of imaging locations and content of video data, and to calculate a frequency of appearance of each of the combinations, and a selection unit configured to select video data to be deleted from the storage unit based on the frequency of appearance, thereby increasing a possibility that the deletion of a high-value video will be avoided.

Abstract: Provided is a virtual world construction system that does not impair consistency between virtual worlds and places only small loads on terminals. A client application 10 that is implemented on a user terminal, a plurality of server applications 20 that are implemented on servers, and a proxy 30 that is located on a communication path between the user terminal and the servers and relays operation information and video information are provided. The proxy 30 includes a motion duplication unit 31 that transmits operation information to the plurality of servers by duplicating the operation information, and a video integration/rendering control unit 32 that transmits timing information regarding rendering timing to the plurality of servers, and transmits video information received from at least one of the servers, to the user terminals.

Abstract: A local wavelength defragmentation apparatus performs wavelength defragmentation for at least one wavelength path passing through a target link in an optical transmission network. The local wavelength defragmentation apparatus includes a reallocation rank determination unit configured to calculate a remaining time from a present time to an abolition timing for each of the at least one wavelength path and determine rank for wavelength reallocation of the at least one wavelength path based on the remaining time; and a reallocation number determination unit configured to calculate utilization of at least one reallocatable wavelength number for each of the at least one wavelength path according to the rank, and determine a wavelength so that a wavelength of the wavelength number having the highest utilization is reallocated.

Abstract: A message relay apparatus and a message relay method that achieve high message reachability taking communication network situation into consideration are provided. A message relay apparatus 100 interposed between an application 20 and a device 30 includes a device communication state determination functional unit 131 that determines communication availability with the device 30, a network state estimation unit 133 that estimates a network state based on the communication availability, and a message processing unit 110 that determines forwarding availability of an application message based on the network state and buffers the application message when forwarding is not available.

Abstract: An information delivery technique for, at the time of delivery of area information via a network, delivering area information about a destination before a device arrives at the destination is disclosed. One aspect of the present disclosure is an information delivery apparatus including a delivery information management function unit configured to manage area information to be delivered, a destination management function unit configured to manage a destination of a device, and a communication function unit configured to deliver the area information to the device, wherein the destination management function unit determines the destination of the device using movement information about the device, and the communication function unit delivers area information about the destination to the device before the device moves to the destination.

Abstract: A time providing method includes: by a computer, upon receiving data from a device, estimating a generation time of the data using a reception time of the data and a first delay time of the device previously estimated; providing information indicating the generation time to the data; and transmitting the data provided with the information indicating the generation time to a destination of the data.

Abstract: A video management apparatus includes a storage processing unit configured to store, in a storage unit, video data received through a network, a determination unit configured to determine whether or not video data groups stored in the storage unit are analyzed based on a first period of time indicating a period of time until a free capacity becomes insufficient in the storage unit and a second period of time indicating a maximum analysis time required for analysis of the video data groups, a first calculation unit configured to analyze the video data groups to calculate a predetermined statistic in a case where it is determined that the video data groups are analyzed, and a deletion unit configured to delete the analyzed video data groups.

Abstract: Provided is a virtual world construction system that does not impair consistency between virtual worlds and places only small loads on terminals. A client application 10 that is implemented on a user terminal, a plurality of server applications 20 that are implemented on servers, and a proxy 30 that is located on a communication path between the user terminal and the servers and relays operation information and video information are provided. The proxy 30 includes a motion duplication unit 31 that transmits operation information to the plurality of servers by duplicating the operation information, and a video integration/rendering control unit 32 that transmits timing information regarding rendering timing to the plurality of servers, and transmits video information received from at least one of the servers, to the user terminals.

Abstract: A video management apparatus includes a storage processing unit configured to store, in a storage unit, video data received through a network, a determination unit configured to determine whether or not video data groups stored in the storage unit are analyzed based on a first period of time indicating a period of time until a free capacity becomes insufficient in the storage unit and a second period of time indicating a maximum analysis time required for analysis of the video data groups, a first calculation unit configured to analyze the video data groups to calculate a predetermined statistic in a case where it is determined that the video data groups are analyzed, and a deletion unit configured to delete the analyzed video data groups.

Abstract: A video management device includes a storage processing unit configured to store video data received through a network in a storage unit, a calculation unit configured to classify a video data group stored in the storage unit based on combinations of imaging locations and content of video data, and to calculate a frequency of appearance of each of the combinations, and a selection unit configured to select video data to be deleted from the storage unit based on the frequency of appearance, thereby increasing a possibility that the deletion of a high-value video will be avoided.

Abstract: A data transmission apparatus causes a computer to receive first data and second data, each of which has a different transmission destination, evaluate relevance between the first data and the second data, and transmit the first data and the second data to the respective transmission destinations, and the transmitting of the data further includes transmitting the first data to the transmission destination of the second data in accordance with evaluation results obtained in the evaluating of the relation, so that a diversity of the data that can be collected by the transmission destination of the data is increased.

Abstract: An information delivery technique for, at the time of delivery of area information via a network, delivering area information about a destination before a device arrives at the destination is disclosed. One aspect of the present disclosure is an information delivery apparatus including a delivery information management function unit configured to manage area information to be delivered, a destination management function unit configured to manage a destination of a device, and a communication function unit configured to deliver the area information to the device, wherein the destination management function unit determines the destination of the device using movement information about the device, and the communication function unit delivers area information about the destination to the device before the device moves to the destination.

Abstract: A time providing method includes: by a computer, upon receiving data from a device, estimating a generation time of the data using a reception time of the data and a first delay time of the device previously estimated; providing information indicating the generation time to the data; and transmitting the data provided with the information indicating the generation time to a destination of the data.