Abstract: A semiconductor integrated circuit for a radio communication terminal sequentially uses a plurality of frequency channels by instructions from a hopping frequency decision unit to receive packet data by a reception unit. When the integrated circuit cannot detect the head of the packet data in reception operations, the integrated circuit cannot receive packet data should be received originally then assumes that the received packet data is a packet error. And the integrated circuit calculates packet error rates for each frequency channel on the basis of the number of times of reception operations performed for each frequency channel and of the number of times of packet errors to estimate channel qualities by using the packet error rates.

Abstract: A radio communication terminal network with a tree structure is formed in such a way that a plurality of receiving side terminal devices on a downstream side of a source terminal device are connected to the source terminal device, and other receiving side terminal devices on a further downstream side are connected to at least one of the plurality of the receiving side terminal devices.

Abstract: A transactional file system configured to realize atomic update of plural files by transactions. In the transactional file system, a log entry containing information for validating all updates made by a transaction collectively on a stable memory device, is generated for one or more files updated on a buffer region by the transaction since a start of a processing of the transaction until a commit of the transaction. Then, the log entry is written into the stable memory device at a time of the commit of the transaction.

Abstract: A scheme for systematically registering meta-data with respect to various types of individual data so as to enable sophisticated retrieval or application program construction assistance utilizing the meta-data in a data server is disclosed. A data type of registering data to be registered into a data server that registers and manages data and meta-data for data, and one procedure corresponding to the detected data type is selected from a plurality of procedures provided in correspondence to respective data types and stored in advance, each procedure having a program code for generating the meta-data for data according to a corresponding data type. Then, the meta-data for the registering data are generated by executing the program code of the selected procedure, and the generated meta-data are registered in relation to the registering data.

Abstract: A data recording and recomposing method according to one embodiment of the invention includes the following processes. When desired reception data is extracted from one or a plurality of reception data and the extracted reception data is recorded, additional information which represents the data size of the reception data received during a predetermined time interval is recorded. The recorded desired reception data is recomposed while determining the data size to be recomposed per predetermined time interval based on the additional information.

Abstract: A scheme for constructing a database in a user system, which can automatically store those portions of the structured documents which contain important contents without exerting a burden on the user is disclosed. A structured document provided by a server device is obtained according to a document request made by the user system, where each structured document has a structure represented by tags in each structured document. Then, at least one important portion is automatically extracted from the structured document by utilizing the structure of the structured document according to prescribed extraction criteria specified in advance, and the extracted important portion is stored into the database, while the obtained structured document is transferred to the user system.

Abstract: A semiconductor integrated circuit for a radio communication terminal sequentially uses a plurality of frequency channels by instructions from a hopping frequency decision unit to receive packet data by a reception unit. When the integrated circuit cannot detect the head of the packet data in reception operations, the integrated circuit cannot receive packet data should be received originally then assumes that the received packet data is a packet error. And the integrated circuit calculates packet error rates for each frequency channel on the basis of the number of times of reception operations performed for each frequency channel and of the number of times of packet errors to estimate channel qualities by using the packet error rates.

Abstract: A scheme for systematically registering meta-data with respect to various types of individual data so as to enable sophisticated retrieval or application program construction assistance utilizing the meta-data in a data server is disclosed. A data-type of registering data to be registered into a data server that registers and manages data and meta-data for data, and one procedure corresponding to the detected data type is selected from a plurality of procedures provided in correspondence to respective data types and stored in advance, each procedure having a program code for gene rating the meta-data for data according to a corresponding data type. Then, the meta-data for the registering data are generated by executing the program code of the selected procedure, and the generated meta-data are registered in relation to the registering data.

Abstract: A radio communication apparatus determines whether a reception signal is received normally. The apparatus measures strengths of the reception signal, assesses frequency channels using a result whether the reception signal is received normally and a strength of the reception signal, and decides that zero or more of the frequency channels as unusable channel in accordance with a result of an assessment of the frequency channels. The apparatus transmits a radio signal using one of the frequency channels sequentially without using the unusable channel.

Abstract: A radio communication terminal network with a tree structure is formed in such a way that a plurality of receiving side terminal devices on a downstream side of a source terminal device are connected to the source terminal device, and other receiving side terminal devices on a further downstream side are connected to at least one of the plurality of the receiving side terminal devices.

Abstract: A radio communication terminal network with a tree structure is formed in such a way that a plurality of receiving side terminal devices on a downstream side of a source terminal device are connected to the source terminal device, and other receiving side terminal devices on a further downstream side are connected to at least one of the plurality of the receiving side terminal devices.

Abstract: A scheme for constructing a database in a user system, which can automatically store those portions of the structured documents which contain important contents without exerting a burden on the user is disclosed. A structured document provided by a server device is obtained according to a document request made by the user system, where each structured document has a structure represented by tags in each structured document. Then, at least one important portion is automatically extracted from the structured document by utilizing the structure of the structured document according to prescribed extraction criteria specified in advance, and the extracted important portion is stored into the database, while the obtained structured document is transferred to the user system.

Abstract: A scheme for constructing a database in a user system, which can automatically store those portions of the structured documents which contain important contents without exerting a burden on the user is disclosed. A structured document provided by a server device is obtained according to a document request made by the user system, where each structured document has a structure represented by tags in each structured document. Then, at least one important portion is automatically extracted from the structured document by utilizing the structure of the structured document according to prescribed extraction criteria specified in advance, and the extracted important portion is stored into the database, while the obtained structured document is transferred to the user system.

Abstract: A scheme for systematically registering meta-data with respect to various types of individual data so as to enable sophisticated retrieval or application program construction assistance utilizing the meta-data in a data server is disclosed. A data type of registering data to be registered into a data server that registers and manages data and meta-data for data, and one procedure corresponding to the detected data type is selected from a plurality of procedures provided in correspondence to respective data types and stored in advance, each procedure having a program code for generating the meta-data for data according to a corresponding data type. Then, the meta-data for the registering data are generated by executing the program code of the selected procedure, and the generated meta-data are registered in relation to the registering data.

Abstract: A transaction processing system capable of easily and efficiently realizing the file update processing by a plurality of transactions operating in parallel as well as the recovery processing at a time of a fault occurrence is disclosed. In the transaction processing system, a plurality of transactions that carry out update processing with respect to one file read out onto a buffer region are executed, and that one file is written into a stable memory device at a time of commit of one transaction among the plurality of transactions, where that one file contains a content of committed updates made by that one transaction and a content of non-committed updates made by other non-committed transactions, and information for cancelling the non-committed updates.

Abstract: A transactional file system which is capable of realizing atomic update of plural files by transactions is disclosed. In the transactional file system, a log entry containing an information for validating all updates made by a transaction collectively on a stable memory device, is generated for one or more files updated on a buffer region by the transaction since a start of a processing of the transaction until a commit of the transaction. Then, the log entry is written into the stable memory device at a time of the commit of the transaction.

Abstract: A transactional file system capable of realizing atomic update of plural files by transactions. In the transactional file system, a log entry containing information for validating all updates made by transaction collectively on a stable memory device, is generated for one or more files updated on a buffer region by the transaction since a start of a processing of the transaction until a commit of the transaction. Then, the log entry is written into the stable memory device at a time of the commit of the transaction.

Abstract: A data management system capable of realizing improved flexibility, independency and expandability together is disclosed. The data management system is formed by a memory unit configured to store a plurality of data operation modules for operating data which have different operation functions, and an operation unit configured to read out data requested by the application program from the data storage system, select those data operation modules that should carry out the operations with respect to the data such that the data will be in compliance with a data model suitable for the processing that the application program wishes to carry out, from the plurality of data operation modules, such that the data to which the operations are applied by selected data operation modules are given to the application program.

Abstract: A data management system capable of realizing improved flexibility, independency and expandability together is disclosed. The data management system is formed by a memory unit configured to store a plurality of data operation modules for operating data which have different operation functions, and an operation unit configured to read out data requested by the application program from the data storage system, select those data operation modules that should carry out the operations with respect to the data such that the data will be in compliance with a data model suitable for the processing that the application program wishes to carry out, from the plurality of data operation modules, such that the data to which the operations are applied by selected data operation modules are given to the application program.

Abstract: In an information transmission and reception system formed by an information providing device for providing information of an information provider to an information receiver through a network and a plurality of relay devices connected to the network, each relay device having at least one of two or more different radio interfaces, and an information receiving device for receiving the information, a related information for selecting one of the different radio interfaces is stored at the information providing device, and the information is transmitted and received through one relay device that has one radio interface specified by the related information.