Nec Corporation

Tomy Company, Ltd.

Gang Co., Ltd.

Yasuhiro Yamasaki

Norihito Fujita

Hiroyuki Matsukawa

Satoshi Uchida

Hideyuki Shimonishi

Yohei Hasegawa

Tutomu Murase

Nobuhiko Itoh

Kazumine Ogura

Yoichi Hatano

Tomohito Nagai

Hideaki Sone

Hideaki Goto

Provided are a communication terminal, communication system, information sharing method and information sharing program, which are capable of reducing the control load when detecting duplicate held content among a plurality of communication terminals. A communication terminal comprises: a communication unit which communicates with another terminal; a content retention unit which retains content; a content list transmission and receiving unit which transmits and receives a content list relating to the retained content; and a transmission timing determination unit which determines the timing at which to transmit the content list on the basis of the number of held content items.

Information sharing method

Accessory for spinning top toy

In a network system in which a plurality of data utilizing networks are present, in order to achieve both prevention of data spread across different data utilizing networks and an increase in the number of terminals configuring a data forwarding network, a terminal device that reproduces and forwards data by the store-and-forward system determines participation in a data forwarding network and a data utilizing network by managing network control information for network control and data access control information for data access control simultaneously with data.

Terminal device, control method, and recording medium storing control program

A communication system that improves the total throughput of the communication is provided. A communication system () according to the present invention includes a plurality of terminals and an access point () with which the terminals communicate. The terminal acquires the number of terminals in a communication network of the access point (), and divides, based on the number of terminals, the plurality of terminals into groups so that each group includes the number of terminals equal to or smaller than the number of terminals permitted to communicate with the access point () within a predetermined period. The terminal allocates the group to the predetermined period, and determines, based on the group to which a terminal belongs, whether to permit data transmission within the predetermined period to which the group is allocated.

Communication system, communication device, communication control method, and non-transitory computer readable medium

When one motor rotates a rotating disk, the rotating disk rotates a first moving body, and the rotating disk moves a second moving body from an initial position against a bias force of a bias unit, a protrusion of the rotating disk engages with allowance with a recess portion of the first moving body so that the rotating disk does not rotate reversely when the second moving body returns to the initial position. With this device, it is possible to move only either one of two moving bodies operated by one motor.

Provided is a quality-deteriorated part analyzing system capable of analyzing a quality-deteriorated part in a network while increasing the degree of freedom of precision (coverage ratio, sectioning divisions, etc.) independently of the number and installation locations of devices transmitting and receiving flows. Path calculation meansdetermines paths, each passing through one or more directed links between nodes in the network and being regarded as a target of communication quality measurement, and generates a path table which indicates directed links included in each communication quality measurement target section. Quality measurement meansmeasures communication quality based on the flows corresponding to the paths determined by the path calculation means. Analysis meansanalyzes a communication quality-deteriorated part in the directed links in the network based on the path table and the communication quality.

Quality-deteriorated part analyzing system, quality-deteriorated part analyzing device, quality-deteriorated part analyzing method, and quality-deteriorated part analyzing program

A loop detecting device is provided which is capable of detecting a loop packet or a loop flow with less processing load. A sorting meansclassifies packets from each of which information is extracted by a packet information extracting device, based on first predetermined information included in packet information, counts the number of the classified packets for each first predetermined information, and specifies first predetermined information in which a count result reaches greater than or equal to a first threshold value. A determining meansdetermines whether each packet having the first predetermined information specified by the sorting meansis a loop packet or whether each flow specified by the first predetermined information is a loop flow by using second predetermined information included in the packet information received by a receiving meanswith the first predetermined information specified by the sorting meansas a target.

Loop detecting device, system, method and program

In a data reception processor () in a session relaying apparatus (-), a data amount monitor () monitors the data amount within the session relaying apparatus (-), a receivable amount calculating unit () requires a data receivable amount which is informed from the session relaying apparatus (-) to a data transmission terminal () in a devaluating way according to a predetermined function, a receivable amount informing unit () informs the data transmission terminal () of the value, and in the data output processor (), an initialization judging unit () makes a judgment about initialization of the transmission amount, according to the amount resulting from the data monitor () monitoring the data amount within the session relaying apparatus (-), and a transmissive amount calculating unit () determines the data transmissive amount by using the result.

Session relaying apparatus, session relay method, and session relay program

A packet forwarding apparatus, a communication system, and a process rule update method that can accurately delete process rules used for packet forwarding and the like include a process rule storage unit that stores process rules defining a process content for each flow; a packet process unit that executes processing a received a packet by using a process rule matching the received packet among the process rules and; an end determination information extraction unit that extracts information for checking a flow end from the received packet; and a flow end check unit that deletes, when a flow end is checked based on the extracted information, a process rule corresponding to the flow.

Packet forwarding apparatus, communication system, process rule update method, and program

In a system, there is provided a packet information registration section for selecting one of the plurality of packet information storage areas upon receiving a packet and storing, in the selected packet information storing area, information corresponding to the field values including at least the acknowledgment number in the received packet, and a counting section for counting the number of pieces of information commonly stored in packet information storage areas equal in number two or more than a predetermined number.

Packet loss frequency measuring system, packet loss frequency measuring method, and program

A communication quality estimation system has: a plurality of equipments performing packet transmission on a network; and a communication quality estimation equipment. The plurality of equipments includes: a first equipment; a second equipment; and a third equipment placed downstream of the first equipment and upstream of the second equipment. The communication quality estimation equipment estimates communication quality in the third equipment by comparing a number of first packets satisfying a first sampling rule out of packets transmitted by the first equipment and a number of second packets satisfying the first sampling rule out of packets transmitted by the second equipment.

Communication quality estimation system, equipment, method and program

To provide a node device improving the measurement accuracy of the network communication quality and creating a smaller table for managing statistics information on the communication quality. An importance degree judging section determines the importance degree of a flow by referencing data for judging the degree of importance in the Z-list. An E-list stores statistics data on a flow having a high degree of importance of monitoring. A change judging section makes a judgment on change according to the importance degree of the flow and the importance degree in the E-list. An integral quality calculating section totalizes the qualities of the normal packet information that was measured in a normal packet quality measuring section and the statistics information that was measured in a statistics information quality measuring section and records the total in a quality result section.

Node device, node system, and method and program for changing statistic information management table used for the node device

A communication quality measuring device includes: a quality measuring unit that measures the communication quality of a transmission path, based on data being transmitted through the transmission path; an observation time calculating unit that calculates a time interval for securing an observation time for the quality measuring unit; and a measurement triggering unit that causes the quality measuring unit to start measurement at the time interval calculated by the observation time calculating unit. The observation time is the time required for maintaining predetermined measurement accuracy in the communication quality measured by the quality measuring unit.

Transmission path quality measuring device, communication system, quality measurement method, and quality measuring program

An inversion of a packet transmission sequence number is observed in a predetermined sampling measurement. The number of sampled sequence numbers greater than the sequence number upon the inversion is measured as an inversion degree. A number of packet losses or a loss ratio is estimated according to the inversion degree under the estimated full sampling measurement and the inversion degree observed under a predetermined sampling measurement.

Estimation method, device, and program, and network measuring system

A data receiving portion receives data from a network. A filtering portion classifies the data received at the data receiving portion by flow. A condition monitoring portion monitors, for each flow, ACK-number information and SN-number information of the received data. A quality-determining portion determines whether or not a packet loss has occurred and the position of occurrences of packet losses, on the basis of information from the condition monitoring portion.

Growing community of inventors

Tokyo, Japan

Yasuhiro Yamasaki