Abstract: In a method and a device by which a service user can receive an event notifying message without disclosing contact information to an event notifier, a combination of a message ID acquired from a message receiver having received from a proxy request device an offering of the message ID using a unique code or symbol by which a destination can not be specified and contact information of the receiver is held, and an event notifying message corresponding to the message ID is transmitted to the message receiver of the contact information having the combination with the message ID when the message ID is received from the proxy request device, with an occurrence of an event. When the receiver receives the offering of the message ID and the message ID is received from the proxy request device having acquired the message ID from the receiver with an occurrence of an event, an event notifying message corresponding to the message ID is also transmitted.

Abstract: A network failure detection apparatus is realized as a function of a terminal in a network. The network failure detection apparatus transmits reachability confirmation packets to a terminal of search object. From a reachability condition decided on the basis of the receiving condition of response packets responding to the reachability confirmation packets, it is decided whether there is an L2 loop occurred on a path to the terminal of search object.

Abstract: In a moving picture decoding apparatus, a variable-length decoding circuit decodes motion vectors for each macroblock from a bit stream and stores the motion vectors. An error correction circuit calculates a reference vector for an error macroblock using the motion vectors to generate a corrected picture from a reference picture. An inverse-orthogonal transform circuit stores a difference value between direct-current (DC) components after Inverse Discrete Cosine Transform (IDCT) is performed thereon, in the memory for each macroblock. The error correction circuit further calculates a difference value of the DC component of the error macroblock using the difference values of DC components stored in the memory, to add the difference value calculated to the corrected picture generated from the reference picture.

Abstract: The network failure detection apparatus is realized as a function of a terminal in a network. The network failure detection apparatus acquires packet reception statistic information on a port-by-port basis of a relay unit, and extracts a port having a large amount of packet reception per unit time. When there is one port having a large reception amount in a certain relay unit, the network failure detection apparatus decides that the L2 (layer 2) loop is occurred in the downstream direction of the port concerned. Also, when there are two ports having a large reception amount in a certain relay unit, the network failure detection apparatus decides that a loop is formed at the relevant two ports, in which the L2 loop is occurred.

Abstract: Disclosed is a communication control method for recovering communication failures caused by a packet loop that occurs as a result of L2-level misconnection at relay switches in a communication system where data transmission/reception is carried out between a plurality of end hosts connected to the relay switches within a subnet. The method includes the steps of consecutively sending packets each having, as its originator address, a MAC address other than an originator MAC address of an end host desired to be communicated making up the subnet; thereby stopping the packet loop; and then sending packet data using, as a destination MAC address, a MAC address of a destination end host.

Abstract: A full duplex/half duplex mismatch is detected by a full duplex/half duplex mismatch detecting apparatus connected through a network to a host. The loss rate of the transmission of a check messages is compared according to a sequential transmission pattern and the loss rate of the transmission of the check message according to divided transmission patterns by the full duplex/half duplex mismatch detecting apparatus, and if the loss rate of the transmission of the check messages according to the sequential transmission pattern is the larger, a full duplex/half duplex mismatch is determined to be present on the network path.

Abstract: In a communication system, transmission/reception of data can be performed between end hosts connected to a relay switch in a subnet even in an improper connection at a L2 level in the relay switch in a communication. Communication failure due to a packet loop generated by the improper connection of the L2 level is recovered by wherein the packet loop is stopped by continuously transmitting long-size MAC packets longer than a packet generating the packet loop into the subnet, which have destinations as a broadcast MAC address or multicast MAC address.

Abstract: The same label value is assigned to all links configuring a connection in a network where an LSP (Label switched Path) is identified based on a label. Even when any one of nodes included in the connection is shortcut due to a change of route of the connection, a neighboring node to this shortcut node in the transmitting direction can receive, from a neighboring node to the shortcut node in the receiving direction, a packet having the same label value as a label value received from the LSR.

Abstract: A service assignment apparatus sets an appropriate service in a service-request-incompatible apparatus as a network element so as to guarantee the service in the entire network. A service-request-compatible apparatus processes a received network-service request, and provides a service. A network-information collection unit in the service assignment apparatus collects information on a service-provision state of the service-request-compatible apparatus. A target-apparatus determination unit determines a service-request-incompatible apparatus based on the collected information on the service-provision state. A service mapping unit determines a service which the service-request-incompatible apparatus can provide, based on the information on the service-provision state and information on the determined service-request-incompatible apparatus. A service setting unit sets the service in the service-request-incompatible apparatus.

Abstract: A molten metal treatment consisting of a liquid mixture in which fluorinated ketone is dissolved in liquid carbon dioxide at 0.01 to 10 wt % is put in a container, and the molten metal treatment is vaporized, and is fed as a cover gas to be contacted with the surface of a molten metal.

Abstract: A layer-structured MPLS path is set up in a short time by using a minimum number of control messages. A relay apparatus acting as the start point of the highest-layer L2 path creates a label request message specifying the intermediate-point and end-point relay apparatuses for all the paths of all the layers, and transmits it to the end-point relay apparatus of the L2 path. At a relay apparatus permitted to use an already established L1 path, instead of requesting a label of the L1 path, the label of the already established path is inserted in the label request message. In response to the label request message, a label mapping message is transmitted and transferred to the start-point relay apparatus. With this message, each node determines the labels associated with it and transfers them to its adjacent relay apparatus.

Abstract: A radio communication system for leveling off the processing loads of radio stations (access points) to which mobile terminals are connected, to improve the quality of service in radio communication. A mobile terminal searches for a beacon signal and transmits a connection request to a radio station which has sent the beacon signal captured. In the access point, a beacon-signal transmission section transmits the beacon signal, a connection-count management section manages, according to a connection-completion message, a local-station connection count and an other-station connection count, and a connection processing section receives the connection request, performs comparison processing for the local-station connection count and the other-station connection count, applies, when the local-station connection count is smaller than the other-station connection count, connection processing to the mobile terminal and generates a connection-completion message when a connection to the mobile terminal is completed.

Abstract: The present invention relates to label switch networks and allows for reducing the processing cost and processing time required at each node when various services are performed with respect to traffic engineering in the label switch networks including a multi-protocol label switching (MPLS) network. In a label switch network system a first node that is disposed at the ingress of the label switch network transfers IP packets corresponding to IP flows based on labels, and that selects and sets up layer 2 paths for transferring the IP packets with reference to header or payload information of the IP packets. A plurality of second nodes may be disposed at intermediate points of the network and they set up the layer 2 paths from the ingress to the egress of the network following the specified routes and a third node is disposed at the egress of the network.

Abstract: A network looping detecting apparatus has an increased real-time operation capability for network looping detection and also has scalability. The network looping detecting apparatus has a count information acquiring unit for periodically acquiring count information which is counted up when the lifetime of a packet has elapsed, from a network device of a network to be monitored for network looping. The network looping detecting apparatus also has a looping detecting unit for detecting network looping from the count information. Specifically, the network looping detecting apparatus detects network looping based on the fact that when a packet loops due to network looping, the lifetime of the packet elapses, and the count information is counted up.

Abstract: In a relay device or the like in which a speed changes from a high speed to a low speed, a packet residence (packet transfer wait) occurs when a packet string in which packet intervals are shortened arrives. When a packet discard occurs before passing through the relay device or the like, a packet interval having been lengthened by the packet discard is shortened by the relay device or the like for transferring packets. When a packet discard occurs after passing through the relay device or the like, a packet interval having been lengthened by the packet discard remains unshortened for transferring packets. Therefore, by observing at terminals the packet discard and the packet interval on the occasion of the packet discard, whether the packet discard has occurred in the high speed section or the low speed section is specified.

Abstract: A computer-readable recording medium recording a program capable of accurately analyzing the cause of a performance fault at the very end point of a client system, server system, etc. Outgoing and incoming packets are captured during execution of a communication application to measure a round trip time, and a communication window size of the transmitting source is estimated based on the captured incoming packets. A throughput estimate is calculated from the round trip time and the communication window size, and the estimated value and actual measured value of the throughput are displayed on, for example, a display, together with various other communication parameters including the communication window size and the round trip time, whereby the cause of a performance fault can be accurately located by quantitative analysis.

Abstract: A method and a system using the method enabling to decrease required resource for the bandwidth reservation in an inter-site connection network used for communication between communication sites. The aggregation of bandwidth is considered for allocating bandwidth in the inter-site connection network. The network consists of a plurality of nodes each having a packet switch, and a plurality of user sites each constituted by a host or an internal network respectively connected to the plurality of nodes via access lines. With respect to the plurality of user sites, when one user site is to be connected to the other site through the network, a necessary and sufficient bandwidth for interconnecting between the user site and the other is calculated according to the bandwidth of the access line connecting the user site to the network considered as a minimal bandwidth. Based on the calculated result, the bandwidth is allocated to the plurality of nodes.

Abstract: For controlling a traffic on a network including a plurality of links, the apparatus includes a collecting unit that collects information on the traffic for each of the links periodically; an acquiring unit that acquires basic data collected from a link for a predetermined period; and a predicting unit that predicts a future traffic on the link based on the basic data. The start time of the predetermined period is the time when the latest control of the traffic was performed on the link or other link adjacent to the link.

Abstract: A traffic management system manages, distributes, and controls various traveling states of vehicles at a high quality level. A vehicle-mounted unit performs an interconnection process for user authentication when entering a predetermined radio-wave zone. A radio unit disposed on a road sends interconnection process completion information to a center device when the interconnection process for connection to the vehicle is completed. If the vehicle does not connect to the radio unit after elapsed of a predicted time at which the vehicle is expected to travel across the radio unit, then the radio unit sends an overtime to the center device. The interconnection process completion information is received, the center device calculates a predicted time at which the vehicle is expected to pass across a radio unit, and sends the predicted time to the radio unit. When the overtime is received, the center device determines whether a fault has occurred or not.

Abstract: A small-scale wireless communication system offering advanced security level. An encryption key memory of an access point stores an encryption key list of a plurality of different encryption keys. A change information transmitter periodically transmits change information to a terminal by radio, the change information requesting the change of encryption key. An encryption key selector selects an encryption key from the encryption key list under a rule when the change information transmitter transmits the change information. A terminal-side encryption key memory of the terminal stores a terminal-side encryption key list which is the same as the encryption key list. A change information receiver receives the change information from the access point. Upon reception of the change information, a terminal-side encryption key selector selects an encryption key from the terminal-side encryption key list under a rule which is the same as the rule which the encryption key selector used to select the encryption key.