Nec Corporation

Masahiro Kawato

Takeo Onishi

Takahiro Shiroshima

Tadayuki Oono

Yukio Kobayashi

Hideaki Tani

A log data collection system includes a terminal device accumulating log data; and a collection device collecting the log data from the terminal device through a network, wherein the terminal device includes transmission determination unit which determines a timing of transmitting the log data to the collection device, within a permissible transmission period, being a time span in which transmission of the log data is permitted, based on a state of the terminal device, a state of the network, and a remaining time of the permissible transmission period.

Log data collection system, terminal device, and log data collection method

A push-type information transmission device is provided with a determination unit that determines the number of clients at transmission destinations of push transmission information in each of a plurality of chronologically continuous periods on the basis of at least response delay distribution data which is a probability distribution indicating the ratio of responses to information to the time elapsed since transmission of the information, and allowable band data indicating the allowable amount of information transfer.

Push-type information transmission device, push-type information transmission method, and program

A terminal, a message distribution system, a message distribution method, and a message distribution program are provided, which are capable of reliably delivering a push message to the terminal from a push server, regardless of a type of network utilized by the terminal, while reducing a processing load of the push server. The terminal includes a network status detection unitwhich detects a status of a network connecting the terminal and a distribution device performing push-type message distribution, and a reception unitwhich determines, based on a result of the detection, whether the terminal and the distribution device are located in a same IP address space, selects, if the terminal and the distribution device are not located in the same IP address space, a first communication method utilizing a pre-established TCP session, selects, if the terminal and the distribution device are located in the same IP address space, a second communication method utilizing a TCP session between the distribution device and the terminal, which is newly established by the distribution device when a message is distributed, and receives a message from the distribution device.

Terminal, message distribution system, message distribution method, and computer-readable medium

Provided are a delivery device, a communication system, a load balancing method, and a load balancing program that enable processing loads for maintaining connections with terminals to be balanced over time, and enable the real time property of message delivery to be maintained for an event notification service. The delivery device is provided with: a communication unit () that transmits, to each terminal connected to the delivery device, a keepalive signal to maintain the connection between the delivery device and each terminal when there is no data to be delivered; and a transmission time determination unit () that divides a period in which the communication unit () transmits a keepalive signal into a plurality of time slots, calculates the expected number of transmissions of the keepalive signal for each time slot on the basis of keepalive signal interval information, which represents the interval of the keepalive signal for each terminal, and, if the expected number of transmissions exceeds a predefined threshold value, transmits, to the communication unit (), the keepalive signal for the portion exceeding the threshold value in the time slot prior to the time slot.

Delivery device, communication system, load balancing method, and load balancing program

A systemincludes a first service providing partfor providing a first service, and a second service providing partfor providing a second service. The first service providing parttransmits a first individual ID that is associated with a common ID included in an ID information provision request and that is for identifying a user in the first service, to a user terminal. The second service providing partreceives a service ID for identifying the first service, the first individual ID and the common ID from the user terminal, and transmits the service ID and first individual ID having been received with the common ID associated with a second individual ID that is included in an ID information acquisition request and that is for identifying a user in the second service, to a user terminal.

Service providing system

A virtual machine location system includes a resource conflict detection unit for detecting a resource conflict using measurement data regarding a resource usage state of the entirety of a single server and a resource usage state of virtual machines running on the server, and a virtual machine relocation determination unit for transferring the virtual machine on the server for which a resource conflict has been detected to another server having a lower resource usage rate are included.

Virtual machine location system, virtual machine location method, program, virtual machine manager, and server

For a resource reservation in a distributed resource system, a tentative reservation request and a job reservation request are issued from a job scheduler to a resource management unit. The tentative reservation is valid for a short time period, and cannot coexist with another tentative reservation or the job reservation. In order to actually use resources, a job reservation must be issued after registration of the tentative reservation. If a tentative reservation request is received for a resource to which another tentative reservation request is already accepted, the tentative reservation request is stored in a wait queue, which is successful if the another tentative reservation is cancelled or failed due to the expiration of the validity time period.

System for confirming and cancelling tentative resource reservation within the valid time indicates period during which the tentative reservation request is valid

A virtual machine management apparatus connected to a plurality of server devices via a network generates a new virtual machine on a server device in accordance with a request from a management terminal. At that time, for one or more server devices to which a new virtual machine can be allocated, the virtual machine management apparatus refers to an allocation rule table for storing a score for each of combinations of types of virtual machines. The score indicates appropriateness of a condition that each combination of types of virtual machines is to be allocated to the same server device. Thus, the virtual machine management apparatus computes an index value indicative of appropriateness of a condition that the new virtual machine is to be allocated to the server device. Then the virtual machine management apparatus determines an allocation target for the new virtual machine with reference to the computed index value.

Virtual machine management apparatus, and virtual machine management method and program

[Means for Solution] Access-control-rule application means (), upon receiving an access request, refers to an access control rule DB () and resource information DB (), to judge whether the attribute of a rule matched with the request is permitted, denied, or manual approval. The access-control-rule application means () requests manual-access-control application means () to input a result of approval, if the attribute is manual approval. The manual-access-control application means () inputs the result of approval input from a resource administrator's terminal () into access-control-rule application means (), which outputs the result of approval.

Access control unit

In a resource acquisition system, computing resources are located in different domains, and a resource manager is located in each domain. A scheduler receives a resource acquisition request from a client via a network, and determines at least one administrative domain and transmits to the network a verification request specifying a computing resource and an operation. The resource manager is responsive to the verification request for performing reconfiguration of the specified resource according to the specified operation and verifying that the resource is legitimately reconfigurable, and transmitting back to the scheduler a verification report containing the identifier of the reconfigurable resource. The scheduler is responsive to the verification report for transmitting a reconfiguration request to the resource manager to perform reconfiguration on the verified resource. The scheduler and the resource manager may repeatedly exchange verification requests and verification reports for successively reconfiguring each successive resource according to dependent relationships between computing resources.

Acquisition system for distributed computing resources

In a distributed computing system, an end terminal transmits a job execution request to a job scheduler, which in response determines a resource and a job execution period necessary for executing a job on the resource based on contents of the job indicated in the message. A reservation request message containing the job execution period and the resource identity is sent from the job scheduler to a target resource proxy. The resource proxy determines a scheduled period of the resource based on the job execution period by checking its schedule memory, and transmits a reservation response to the job scheduler. The job scheduler acquires a certificate signed by the user from the end terminal and transmits the acquired certificate to the resource proxy. In response to the certificate of the user, the resource proxy makes a reservation of the identified resource according to the scheduled period.

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Tokyo, Japan

Masahiro Kawato