Nec Corporation

Tdk Corporation

Masayoshi Kobayashi

Toru Mizuno

Tutomu Murase

Naoyuki Ogura

Hideyuki Shimonishi

Yohei Hasegawa

Tsutomu Kitamura

Tetsuro Ito

Atsushi Shindo

Tsuyoshi Ito

A method and a system for stabilizing the sight line of a chip component being carried on two discs, for stabilizing delivery of the chip component between the two discs, and improving and stabilizing the inspection accuracy in the visual check of the chip component. This is achieved by employing a mechanism for carrying the chip component while supporting it on the horizontal plane of the first rotary disc and then carrying the chip component while suction-holding it on the vertical plane of the second rotary disc. When the chip component is carried on the first rotary disc, the upper surface and one side face of the chip component are imaged by first and second cameras. When the chip component is carried on the second rotary disc, the lower surface and the other side face of the chip component are imaged by third and fourth cameras.

Chip component carrying method and system, and visual inspection method and system

Relay units (---) terminate a plurality of transport layer connections from terminals in a transport layer and relay each of these connections to other transport layer connections (relay connections). A transmission rate control unit () determines the total transmission rate of the relay connections according to the number of connections that are being relayed and network congestion conditions such that a desired effective rate is obtained, and moreover, allots the total transmission rate as transmission rates to each of relay units (---) in accordance with the results of the analysis of information of the applications being carried on the transport layer connections during relay.

Transport layer relay method, transport layer relay device, and program

A quality degradation point estimating method for estimating a quality degradation point in a directed link set through which a communication flow passed is provided. The quality degradation point estimating method has: (A) determining a test flow set for estimating a quality degradation point; and (B) estimating the quality degradation point in the directed link set by sending the test flow set to the network. The (A) step includes a step of setting the flow, which passes through a partial set as a part of the directed link set, as the test flow and adding the set test flow to the test flow set. The test flow is sent from the test terminal on the network to a predetermined node in the partial set. A response is obtained at the predetermined node, and the response is sent from the predetermined node to a predetermined terminal.

Quality degradation point estimating system and quality degradation point estimating method

Estimation is carried out with high accuracy based on flow quality information in a situation where, although a set of links that may have a flow passing through is known, which of such links the flow passed through cannot be identified, such as multi-paths routing, load distribution routing, and the like. A device for estimating a quality-degraded location includes a flow quality information collecting section that collects communication quality of a flow of a network, a routing information collecting section that collects routing information of the network, a determining section for determining a quality-degraded flow and a quality-non-degraded flow based on the flow quality information to determine a link through which the flow passes from the routing information of the network, a non-degraded link elimination section that eliminates a link not configuring multi-paths as a non-degraded link without eliminating a link configuring multi-paths as a non-degraded link, for a link on a path of the flow, with respect to the quality-non-degraded flow, and a degraded link determining section for determining a degraded link from links not eliminated as the non-degraded links.

Device, method, and program for estimating quality-degraded location of communication network, and communication network system

A QoS degradation point estimation device includes a flow set decision unit, a flow quality information collection unit, a path information collection unit, a flow link table management unit, and a QoS degradation point estimation unit. Before generating a flow link table associating QoS of a flow through a network with a link the flow passes through, the flow set decision unit preferentially selects a flow passing through almost &#xbd; of the links of the network as a flow to be registered in the table. The flow quality information collection unit collects information of the QoS of the flow. The path information collection unit collects path information of the network. The flow link table management unit generates the table based on the information of the QoS and the path information. The QoS degradation point estimation unit estimates a QoS degradation link based on the table.

QoS degradation point estimation method, QoS degradation point estimation device, and program

An apparatus includes a collection device, a determining device, and an estimating device. The collection device collects information and flow rates of flows circulated in a network and structural information of the network. The determining device finds links through which the flows pass from the information and the network structural information, and determines the flows based on degrading and non-degrading threshold values. The estimating device, from a set of the links through which the quality-degraded flows pass, outputs a subset having a minimum element number and including a link through which an arbitrary flow among the quality-degraded flows passes. The determining device changes, for a set of the quality-degraded flows that pass a link through which a given quality-non-degraded flow passes, the non-degraded flow number threshold value depending on number of elements of a set. When this threshold value becomes high, the estimating device finds a non-degraded link.

Quality-degraded portion estimating apparatus, quality-degraded portion estimating method, and quality-degraded portion estimating program

In a quality degradation (QD) portion estimating method on a network, a passive measuring unit connected with a management target network measures E2E flow quality (FQ) data on a route from a transmitting terminal connected with a different network to a receiving terminal connected with the management target network and upstream FQ data on the route from the transmitting terminal to the passive measuring unit in the management target network. A QD portion estimating section connected with the management target network collects E2E FQ data and upper stream FQ data measured by said passive measuring unit. A detecting section detects as a QD flow in the management target network, a flow related to the E2E FQ data that does not show degradation of FQ, for the upstream FQ data related to the same transmitting and receiving terminals, from among the E2E FQ data which show the degradation of FQ.

Method of estimating quality degradation on network in communication network system

An estimating device includes a collecting unit for collecting flow quality information including a transmitter and receiver address, and flow communication quality; a collecting unit for collecting structure information; a table managing unit and a table storage unit for finding, based on the collected flow quality information of the network, a link that the flow goes through, judging occurrence of quality deterioration in the flow, and managing a result thereof in a table; and a estimating unit for outputting, when there is quality deterioration in one or more flow, a subset including the link that an arbitrary flow with quality deterioration goes through among the subset of the set of links that the set of the arbitrary flows with the quality deterioration go through, which also has the minimum number of elements, as a quality deteriorated area in the table managed by the flow-quality/via-link table managing unit.

Device, method, and program for estimating quality-deteriorated area of network

A switching apparatus for relaying packet communication through a communication network between a plurality of servers and clients, at the time of relaying a packet to be transmitted from the server to the client, rewrites header information of the packet in question to have the contents to be set when the packet in question is transmitted from the switching apparatus and sends the rewritten packet to the client and from the time of relaying a data acquisition request from the client until the end of transmission of a packet of an acknowledgement to be transmitted from the server to the client, conducts one-way splicing in the direction from the server in question to the client in question, as well as successively conducting retransmission control and flow control with respect to communication from the client to the server.

Communication system and packet switching method thereof

A content transfer method allowing the transfer of content requiring no urgency to reduce influence on other traffics is disclosed. A relay server is used to transfer the content from a content server to a cache server. The content is transferred while temporarily storing each relay server in each of sections obtained by the relay server dividing the path from the content server to the cache server. Further, since relay servers perform relay operation during time slots determined for respective ones of the relay servers, the influence on other traffics can be more reduced.

Content transferring technique

A path calculating section obtains a path suitable for carrying out an automatic cache updating operation, a link prefetching operation, and a cache server cooperating operation, based on QoS path information that includes network path information and path load information obtained by a QoS path information obtaining section. An automatic cache updating section, a link prefetching control section, and a cache server cooperating section carry out respective ones of the automatic cache updating operation, the link prefetching operation, and the cache server cooperating operation, by utilizing the path obtained. For example, the path calculating section obtains a maximum remaining bandwidth path as the path.

Technique for enhancing effectiveness of cache server

A data structure allowing the necessary amount of memory to be reduced while maintaining or improving search performance is disclosed. The data structure in which items of data are stored for search includes: a tree structure in which the items or data are stored except for a portion of the items of data corresponding to a sub-tree structure, which is a selected portion of an assumed tree structure formed by all the items of data; and an equivalent table storing the portion of the items of data in table form.

Data structure for search

A router allowing the entry hit probability of the cache to be increased is disclosed. The cache is searched using a different mask for each cache entry. A maximum or optimum cache prefix length is determined as a length of upper bits of the destination address of the received packet which are not masked by a corresponding mask. Alternatively, the cache is searched using longest prefix match (LFM). A cache entry allowing a plurality of destination addresses to be hit can be registered in the cache, resulting in increased cache hit probability.

Router with a cache having a high hit probability

An electronic parts insertion head including a supporting block, an insertion guide movable between first and second positions with respect to the supporting block and configured to guide a lead wire of an electronic part to an attaching hole of a printed wiring board in the first position, an insertion guide moving mechanism configured to move the insertion guide between the first and second positions, a cam capable of moving with respect to the supporting block, a cam follower arranged on the insertion guide and positioned to move along a cam face of the cam, and a cam position changing mechanism configured to change a position of the cam with respect to the support block, wherein the insertion guide changes a movement locus when the position of the cam is changed by the cam position changing mechanisms.

Growing community of inventors

Tokyo, Japan

Masayoshi Kobayashi