Kabushiki Kaisha Toshiba

Toshio Shirakihara

Tatsunori Kanai

Hideaki Hirayama

Kiyoko Sato

Shinichi Kanno

Seiji Maeda

Hirokuni Yano

Shinya Murai

Hajime Yamaguchi

Haruhiko Toyama

Takuya Kawamura

Takuya Hayashi

Nobuo Sakiyama

Yosuke Kuroda

Toshihiko Shimokawa

Hiroshi Yao

Toshiki Kizu

Hiroshi Esaki

Shogo Yamaguchi

Yasuhiro Kimura

Tetsuya Iinuma

Kuninori Tanaka

In an image transmission apparatus an image data generator generates image data that represents an image. An updated image data generator generates updated image data that represents an updated image of an updated region of the image. A compressor compresses the updated image data. A transmitter stores the updated image data that is compressed by the compressor. An updated image data storage stores the updated image data. A transmission result storage stores transmission result data that includes quality information and time information, the quality information relating to an image quality, the time information indicating when the updated image data is generated. A transmission data selector selects the updated image data stored in the updated image data storage, and sets the image quality of the updated image data selected, according to the transmission result data stored in the transmission result storage.

Image transmission apparatus, image transmission method and image transmission program

A memory controller controls a semiconductor storage device including nonvolatile memory cells. The controller includes a generating circuit, and a selection circuit. The generating circuit generates first data based on a second data. The selection circuit retains a cumulative value whose each digit is a cumulative result in each bit of data which is already written in the memory cells. The selection circuit selects one of the first data. A selected first data has a better average of digits in a sum of each bit of the selected first data and each digit of the cumulative value than an unselected first data. The selection circuit retains the sum concerning the selected first data as the new cumulative value.

Memory controller controlling semiconductor storage device and semiconductor device

A screen data transmitting device for transmitting screen data to a screen display terminal through a network. A generation device generates a display image data. A storage device stores compression properties information associating a plurality of compression schemes with a plurality of classes of graphical user interface (GUI) components. A selection device selects one of the compression schemes with respect to a GUI component that is present in a region of the display image data. A compression device compresses the region of the display image data according to the selected compression scheme. Then, a transmission device transmits the screen data including the compressed display image data to the screen display terminal.

Screen data transmitting device

A storage device for which restoration of data is possible without the need for excess equipment includes mirrored storage units for online use and for backup, and is capable of performing a data backup while continuing input and output of data. The storage device is further provided with an update data storage unit for storing update data. According to the storage device, even if the information stored in a storage unit for online use is not capable of being read because of a fault in the storage unit, it is possible to restore the data in the backup storage unit to the state that existed in the storage unit for online use immediately before the fault by applying the update data to the information stored in the storage device for backup.

Storage device, backup method and computer program code of this storage device

Storage device, backup and fault tolerant redundant method and computer program code of plurality storage devices

Methods and systems consistent with this invention link a program module, which implements dynamic linkage to an external function and executes the external function. Such methods and systems replace a function name described in a header portion of a program module and a function name to be referred to by the program module with other names, and link functions having the same names as the replaced function names and executing the linked functions in place of an original function.

Method of changing a dynamic link library function efficiently and a computer system for executing the same

A commit controlling scheme for a transaction processing in a system utilizing the check point/roll back scheme, which is capable of guaranteeing the reliability of data of the transaction processing even when the transaction processing and the check point/roll back scheme are employed simultaneously, is described. An issuance of an external output for notifying to a user that a transaction has been committed is delayed until after a new check point for the transaction processing process is generated by the fault recovery mechanism at a timing later than a commit of the transaction by the transaction processing process. This can be realized by delaying an issuance of a transaction commit notice from the transaction processing process, or by intercepting a transaction commit notice sent from the transaction processing process, or else by delaying an issuance of the external output by the client process after receiving a transaction commit notice from the transaction processing process.

Commit controlling scheme for transaction processing in system utilizing check point/roll back scheme

A process state management scheme capable of acquiring process states consistently even in a case where a new process is generated from some process, while using the synchronous checkpointing method. This scheme prohibits a new process generation during a process state acquisition, which can be realized by judging whether a process generation request by a first process for generating a second process is prior to a process state acquisition request or not, and generating the second process from the first process accordingly. This scheme also prohibits a process state acquisition during a new process generation, which can be realized by acquiring a process state at each of the first and second processes after a notice of the identifier of the second process from the first process is received, when a notice of the identifier of the second process from the second process is prior to the notice from the first process.

Method and system for process state management using checkpoints

A scheme for restarting processes at distributed checkpoints in a client-server computer system, in which a fault in one client computer does not affect the server computer and the other client computers. In this scheme, a fault occurring in one computer among of a plurality of computers constituting a client-server computer system is detected while these plurality of computers are executing respective processes, and whether that one computer in which the fault is detected is a server computer or not is judged. Then, related processes executed on these plurality of computers are restarted when that one computer is judged as the server computer, whereas no process executed on these plurality of computers is restarted when that one computer is not judged as the server computer. It is also possible to specify a restart information for each process indicating how processes should be restarted when a process fault occurs in each process, and to restart selected processes executed on these plurality of computers according to the restart information for a process in which the process fault is detected.

Scheme for restarting processes at distributed checkpoints in

A scheme for image selection in an image transmission system for transmitting images from an image source to an image display device, capable of eliminating a need for the viewer to select the desired image by actually watching individual images and easily selecting the desired image in which a specific desired target of the viewer is shown. Feature information for identifying targets shown in each image is obtained, while a desired feature information for identifying a desired target specified by the viewer is entered. Then, the desired image which contains the desired target specified by the viewer is selected according to the obtained feature information and the entered desired feature information. The feature information may be obtained by recognizing targets shown in each image provided by the image source, or may be generated in advance in correspondence to images provided by the image source.

Method and apparatus for image selection in image transmission system

A network system, in which a plurality of computers are connected to a network at a plurality of connectors, and a plurality of address conversion devices are provided in correspondence to the connectors. In each address conversion device, a fixed address on the network corresponding to each address conversion device is stored, while a computer address of one computer connected at one connector corresponding to each address conversion device is acquired and stored. Then, a source address contained in a message transmitted from that one computer to the network given in terms of the computer address is converted into the stored fixed address, while a destination address contained in a message transmitted from the network to that one computer given in terms of the fixed address is converted into the stored computer address.

Network system supporting network communication among temporarily

A computer system monitors inter-process communications and performs a synchronous (global) checkpointing for processes that belong to a checkpoint group. The system also performs a local checkpointing at respectively arbitrary times within each process. When a fault occurs, a validity of each checkpoint is examined in accordance with monitoring results of inter-process communications related to the fault process. If the most recent checkpoint of the fault process is valid, only the fault process is rolled back. If it is invalid, all processes of the checkpoint group are rolled back to the global checkpoint, or each of the processes are rolled back to each optimum (valid) checkpoint.

Method and apparatus for checkpointing in computer system

A computer system which can achieve rollback operation when a fault occurs in the system without waiting for side-tracking of pre-update data during updating of a file. When a file write request has been made, 'file writing information' pertaining to the file write is saved in a pending queue and only a primary file is immediately updated. After a checkpoint has been acquired, the 'file writing information' saved in the pending queue is shifted to a confirmed queue, and is then written to a back-up file. When performing recovery, all pre-update data which corresponds to the data which has been updated since the last checkpoint acquired is read from the back-up file, based on the 'file writing information' saved in the pending queue. The primary file is then restored to its state at the checkpoint time by using the pre-update data which has been read from the backup file.

Checkpointing computer system having duplicated files for executing

A scheme for checkpointing and a computer system capable of realizing the distributed checkpointing for processes which carry out the inter-process communications, while shortening a stopping time of the processes due to the distributed checkpointing. The inter-process communications of each process are stopped while continuing the normal processing of each process first, and a checkpointing processing for each process is executed when the inter-process communications of all processes are stopped. Alternatively, the inter-computer type inter-process communications of each process are stopped while continuing the intra-computer type inter-process communications and the normal processing of each process first, and a checkpointing processing for each process is executed while stopping the intra-computer type inter-process communications of each process when the inter-computer type inter-process communications of all processes are stopped.

Growing community of inventors

Kanagawa-ken, Japan

Toshio Shirakihara