Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Other

Tomohisa Yamaguchi

Harumi Minemura

Shunichiro Nakamura

Tsuyoshi Kobayashi

Hirotaka Motai

Takashi Watanabe

Shuya Sano

Hiroshi Shimizu

Akio Idehara

Norihito Takatori

Tsugihiko Ohno

Atsushi Kajino

Tadanori Mizuno

Hisafumi Komoto

A time synchronization system includes time masters and a management master. The management master includes a management master priority requester that transmits to each time master a priority request frame and a management master highest priority processor that transmits, to a time master holding a priority that is the highest among priorities of the time masters, a highest priority notification frame for changing the priority to the highest priority. Each of the time masters includes a time master priority responder that transmits to the management master a priority response frame after receiving the priority request frame from the management master (and a time master highest priority processor that changes the priority thereof to the highest priority when the highest priority notification frame is received from the management master. The grandmaster transmits, to each time master, a time notification frame for synchronization of a time of the time master.

Time synchronization system, time master, management master, and time synchronization method

A built-in apparatus includes a response time buffer () that stores a response time, a calculation result buffer () that stores a calculated frame, and a transmission part (). The transmission part () obtains second data and start processing for calculating a frame check sequence from the second data, upon receiving a transmission command (), judges whether frame transmission processing for generating and transmitting the second data and the frame check sequence calculated from the second data as a response frame () will be completed within the response time, and transmits the calculated frame stored in the calculation result buffer () as the response frame () when judging that the frame transmission processing will not be completed within the response time.

Built-in apparatus, communication method, and computer readable medium

An FA network LSI is provided in a communication device performing a communication process in a network layer or higher through a plurality of protocols. The FA network LSI includes a data-link layer processing unit that performs a process in a data link layer for control data, and a protocol processing unit that performs a process in the network layer or higher for the control data. The data-link layer processing unit includes a first data-link layer processing unit to process dedicatedly to correspond to a protocol required high speed processing, a second data-link layer processing unit to process in a standard data link layer, for a protocol other than the protocol required the high speed processing, and a data-link-layer-processing selection unit to select one of the two units mentioned-above. The data-link layer processing unit is formed by hardware.

FA network LSI and communication device

An interrupt signal accepting apparatus manages two OSs, relates devices sharing the same interrupt number respectively with an OS caused to perform an interrupt processing and an interrupt priority unique to a device, and manages an interrupt number priority conversion table showing the relation between the interrupt number and the interrupt priority. Each device continuously outputs an interrupt request having the same interrupt number until the interrupt processing is completed. An interrupt controller converts the interrupt number into the interrupt priority in accordance with the interrupt number priority conversion table when there is an interrupt signal from the devices. An interrupt signal control section causes a running OS to perform the interrupt processing to change the interrupt priority in the interrupt number priority conversion table when the converted interrupt priority matches an interrupt priority related to the running OS, and stops the running OS and starts the other OS when the interrupt priorities do not match.

Interrupt signal accepting apparatus and computer apparatus managing operations of at least two operating systems

A client, a server and a module storing server are linked to a network. When the client outputs a request, the server acquires one of function executing modules, which has a function corresponding to the request from the client, in the module storing server. The acquired function executing module is executed, and then deleted from the server after the execution has been completed.

System of dynamic module configuration and a method thereof

This invention provides a communication system for controlling a device through a network by using a mobile terminal for saving a space and a cost of a whole system. This invention provides contents from a cellular phone. This communication system comprises a cellular phone connected to a controller, and a terminal connected to a network. A Web browser requests to control a device, and a communication controller in a client side sends the request to the cellular phone. A Web server sends the request received at a communication controller in a server side to an extended module, and controls the controller.

Communication system, a communication method, and a cellular phone

This invention relates to a method for providing information by using a contactless IC (integrated circuit) card and a device for providing information. It is an object of this invention to obtain mass data and data created dynamically, and also to solve troublesome work of updating data in the contactless IC card. Dataof location information for accessing dataof external information are stored in a contactless IC card. A devicefor providing information reads the dataof location information and accesses the dataof external information based on the dataof location information read.

Information providing method and information providing device

As a program configuration, a step of requesting a basic side to change an application class as an application module and a core class for changing the application class to a new version by themselves is provided in them. In a platform side for loading each of programs, a sub-core class loader for loading a new version based on a request for changing is provided. In a program of the base class in which the sub-core class loader is provided, a step of starting an operation of the application after loading the new version is provided.

Software-module dynamic loader, a software-module dynamic loading method and a medium storing the software-module dynamic loading method

A client-server system which improves efficiency of each server by distributing loads to a plurality of servers having a plurality of storages for sequentially storing data which are distributed in each of the plurality of storages; a plurality of servers, each of which is connected to the plurality of storages, for accessing the data distributed and stored in each of the plurality of storages; an administration apparatus which is connected to the plurality of servers for administrating the data sequentially stored in the plurality of storages, and the plurality of servers; and a client which is connected to both the administration apparatus and the plurality of servers, the clients specifies a server which is connected to a storage where a head block of the data is stored by inquiring to the administration apparatus, and accesses the data in the plurality of servers according to the order of the data storage sequence from the specified server.

Client-server system with parity storage

A data allocator which allocates data and redundant data for recovering the data. The data allocator has k storage groups, each of which includes m array files. Each array file includes multiple memory areas for storing the data and the redundant data on a block basis. A redundant group is formed which consists of k memory areas, each of which is selected from the same row of each one of k storage groups, and one of the k memory areas stores the redundant data and the remaining (k-1) memory areas store the data. The redundant data are uniformly allocated to m.sup.k sets of memory areas (D.sub.ij1, D.sub.2j2, . . . , D.sub.kjk) of the same rows of the storage groups, where j.sub.i (j.sub.i =1-m) is the number of the array file in each of the storage groups, and D.sub.kjk is the memory area belonging to k-th storage group and j.sub.k -th array file of the k-th storage group. This makes it possible to prevent an increase in the number of accesses to particular array files and the reduction in the data read rate even if one of the array files fails.

Data allocator

The invention relates to a client-server system which improves efficiency of each server by distributing loads to a plurality of servers. The a client-server system comprises a plurality of storages for sequentially storing data which are distributed in each of the plurality of storages; a plurality of servers, each of which is connected to the plurality of storages, for accessing the data distributed and stored in each of the plurality of storages; an administration apparatus which is connected to the plurality of servers for administrating the data sequentially stored in the plurality of storages, and the plurality of servers; and a client which is connected to both the administration apparatus and the plurality of servers, the clients specifies a server which is connected to a storage where a head block of the data is stored by inquiring to the administration apparatus, and accesses the data in the plurality of servers according to the order of the data storage sequence from the specified server.

Growing community of inventors

Tokyo, Japan

Tomohisa Yamaguchi