Abstract: An index calculation unit calculates a periodicity determination index for determining the presence of periodicity on the basis of the differential between each segment of the frequency distribution of input numerical data and a frequency distribution in accordance with a baseline distribution provided ahead of time. A determination unit uses the periodicity determination index calculated by the index calculation unit to determine the presence of periodicity including one or more periodic components present in the numerical data.

Abstract: A network system according to the present invention includes switches; a link connecting switches; first control apparatuses provided to first domain; and a second control apparatus that is provided to a second domain that is an aggregation of the plurality of first domains and controls the plurality of first control apparatuses, each of the first control apparatus controlling the switch included in the first domain, including a database holding an address of a terminal and an identifier of a switch port of the terminal, determining whether a switch port of a forwarding destination of the frame can be resolved based on the database upon reception of a frame in that a path is not set from a switch included in its own domain, and forwarding the unset frame information including an identifier of own domain and the frame to the second control apparatus when the switch port is not resolved.

Abstract: A load applied to a forwarding system such as a switch or a link is reduced by restricting a range of broadcasting of an unset frame. A network system including a switch and a link connecting switches includes a plurality of first control apparatuses that are provided to a plurality of first domains respectively when the network system is divided into the plurality of first domains and control the switch included in the plurality of first domains respectively, and a second control apparatus that is provided to a second domain that is an aggregation of the plurality of first domains and controls the plurality of first control apparatuses.

Abstract: An index calculation unit calculates a periodicity determination index for determining the presence of periodicity on the basis of the differential between each segment of the frequency distribution of input numerical data and a frequency distribution in accordance with a baseline distribution provided ahead of time. A determination unit uses the periodicity determination index calculated by the index calculation unit to determine the presence of periodicity including one or more periodic components present in the numerical data.

Abstract: Data transfer with high throughput is enabled between servers. When in a set of sites each having a usable network operation unit, a new site is added or an existing site withdraws, designing is executed for determining a combination of the network operation units each one of which is to be used in each added or withdrawn site such that at least a site which transmits or receives data becomes reachable based on a connection relationship between each paired network operation units added or withdrawn, and when a combination of the network operation units is determined in the designing, the network operation unit determined is considered as a network operation unit to be newly used in each site.

Abstract: Data transfer with high throughput is enabled between servers. With respect to a candidate of a network operation unit applied at least one to each site of a plurality of sites forming a network, a combination of the network operation units each one of which is to be used by each site is determined such that all the sites become reachable based on a connection relationship applied to each pair of the candidates of the network operation units between different sites.

Abstract: A congestion control system includes: edge devices that aggregate service request messages from clients, and distribute the messages to servers; a plurality of servers that process the service requests from the clients; and a control device. The control device: acquires a service request occurrence rate observed from the edge devices, and, on the basis of the acquired occurrence rate, determines the proportion of service request messages to be regulated as a regulation rate; determines the number of servers that should be operating, and notifies the edge devices of the regulation rate that was determined; and, on the basis of the number of servers that was determined, puts new servers into operation or stops the service of currently operating servers. In a system in which there a limit to server expansion and there is potential for congestion collapse to occur, integrated control is conducted in such a manner that revenue, which allows for input regulation in edge devices and server expansion, is maximized.

Abstract: A device for reproducing a content having at least one reproduction start time predetermined, includes: a non-real time receiver for receiving a content in non-real time; a scheduler for scheduling reception of a content whose delivery method is non-real time delivery by the non-real time receiver based on a current time and a reproduction start time of the content; a content storage section for storing at least one content received by the non-real time receiver; and a reproduction controller for inhibiting reproduction of a content stored in the content storage section before the reproduction start time of the content.

Abstract: The origin server has content in block units formed by dividing the content, and includes content processing means for providing each of the blocks with an identifier including a domain which identifies each substream including the blocks. The domain resolution server includes assignment means for determining a proxy server which should be assigned for each domain identifying the substream. When the assignment means requests a proxy server of an adjacent parent site located upstream, on a path from a site in which the origin server is disposed to an edge site accessed by the client, to resolve a domain of one substream from the proxy server of the own site, the assignment means makes a domain resolution request to a domain resolution server of the parent site for assigning a proxy server, disposed in the parent site, to each of all substreams.

Abstract: The domain resolution server includes measurement means for measuring communication states between sites, path setting means for setting a path for delivering content based on the measurement result, and assignment means for assigning a proxy server corresponding to a domain. The path setting means sets, on the path, a domain resolution server of an adjacent parent site located upstream of the own site as a parent domain resolution server. The assignment means requests the parent domain resolution server for domain resolution based on an identifier, and in accordance with a response, notifies a proxy server of the own site of a proxy server in the parent site to which a content request should be transferred, assigns a proxy server to be required from among the proxy servers in the own site in response to a request from a client or a domain resolution server of a child site, and notifies.

Abstract: Data transfer with high throughput is enabled between servers. With respect to a candidate of a network operation unit applied at least one to each site of a plurality of sites forming a network, a combination of the network operation units each one of which is to be used by each site is determined such that all the sites become reachable based on a connection relationship applied to each pair of the candidates of the network operation units between different sites.

Abstract: Data transfer with high throughput is enabled between servers. When in a set of sites each having a usable network operation unit, a new site is added or an existing site withdraws, designing is executed for determining a combination of the network operation units each one of which is to be used in each added or withdrawn site such that at least a site which transmits or receives data becomes reachable based on a connection relationship between each paired network operation units added or withdrawn, and when a combination of the network operation units is determined in the designing, the network operation unit determined is considered as a network operation unit to be newly used in each site.

Abstract: A datagram relaying apparatus includes a plurality of protocol terminating units, and a destination determining processor. The destination determining processor includes a path selecting section which determines a transfer destination route for a stream of packets received from any of the protocol terminating units. The path selecting section determines whether or not transfer of the received stream of packets to the transfer destination route is in an inhibition state, and selects another transfer destination route when the transfer of the packet to the transfer destination route is in the inhibition state.

Abstract: A content reception device that receives a content having at least one reproduction start time predetermined, includes: a non-real time receiver for receiving a content in non-real time; a program information reference section for referring to program information which includes a reproduction start time of at least one content and a delivery method of said at least one content; a scheduler for scheduling reception of a content whose delivery method is non-real time delivery by the non-real time receiver based on a current time and a reproduction start time of the content; and a content storage section for storing at least one content received by the non-real time receiver.

Abstract: A content reception and reproduction device which receives and reproduces a content having at least one reproduction start time predetermined, includes: a non-real time receiver for receiving a content in non-real time; a program information reference section for referring to program information which includes a reproduction start time of at least one content and a delivery method of said at least one content; a scheduler for scheduling reception of a content whose delivery method is non-real time delivery by the non-real time receiver based on a current time and a reproduction start time of the content; a content storage section for storing at least one content received by the non-real time receiver; and a controller for starting reproduction of a content stored in the content storage section at the reproduction start time of the content.

Abstract: A device for reproducing a content having at least one reproduction start time predetermined, includes: a non-real time receiver for receiving a content in non-real time; a scheduler for scheduling reception of a content whose delivery method is non-real time delivery by the non-real time receiver based on a current time and a reproduction start time of the content; a content storage section for storing at least one content received by the non-real time receiver; and a reproduction controller for inhibiting reproduction of a content stored in the content storage section before the reproduction start time of the content.

Abstract: A datagram relaying apparatus includes a plurality of protocol terminating units, and a destination determining processor. The destination determining processor includes a path selecting section which determines a transfer destination route for a stream of packets received from any of the protocol terminating units. The path selecting section determines whether or not transfer of the received stream of packets to the transfer destination route is in an inhibition state, and selects another transfer destination route when the transfer of the packet to the transfer destination route is in the inhibition state.

Abstract: A datagram relaying apparatus includes a plurality of protocol terminating units, and a destination determining processor. The destination determining processor includes a path selecting section which determines a transfer destination route for a stream of packets received from any of the protocol terminating units. The path selecting section determines whether or not transfer of the received stream of packets to the transfer destination route is in an inhibition state, and selects another transfer destination route when the transfer of the packet to the transfer destination route is in the inhibition state.

Abstract: In an infrastructure solution for content-based forwarding, filter pipelining enables handling of the high-rate message streams. Documents are distributed in the network by forwarding from publisher proxy servers to attribute trees associated with particular attributes in the message. The trees filter the messages based on attribute values, and deliver the messages to subscriber proxy servers for predicate-based distribution to subscribers. To maximize throughput, the attribute trees utilize the concept of weak filtering, wherein a message may be delivered to a node in the attribute tree that is associated with a range of attribute values that does not include the attribute value of the message.

Abstract: Disclosed is a method and apparatus for delivering information of interests from content providers to clients via a data network. A network architecture includes two types of edge servers, referred to as forward proxy servers and reverse proxy servers. The forward proxy servers are assigned to serve particular clients with respect to particular information and the reverse proxy servers are assigned to serve particular forward proxy servers with respect to particular information. Each of the forward proxy servers stores information identifiers associated with information for which the forward proxy server is assigned to serve to at least one client. Each of the reverse proxy servers stores information identifiers and the associated forward proxy servers that the reverse proxy server is assigned to serve with respect to information associated with the information identifiers.