Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Hitachi Microcomputer System, Ltd.

Kazuhiro Satoh

Akira Yamamoto

Masashi Tsuchida

Toshiyuki Akiyama

Hiroyuki Kitajima

Naoki Ozawa

Itaru Mimura

Hiroshi Fujise

Youichi Yamamoto

Mitsunobu Tasaka

Miyoko Namioka

Kazuhiko Ohmachi

Masayuki Tsuchiya

Yoichi Yamamoto

Takeo Maruyama

Tadashi Ohsone

Keiji Moki

Yoshiaki Yamashita

Nobuhiro Taniguchi

Takashi Muramatsu

Syusaku Nagahara

Shinichi Fukushima

An object-oriented system which deals with data and procedure integrally includes a memory having a real memory space which contains a set of object management information, a set of page management information, a fixed page region and an unfixed page region, a memory management section for managing these parts, a swap file for saving pages, and a method execution section which executes the procedure of an object. When loading the object into the real memory space, address-unfixed pages in the unfixed page region are allotted to the object and address-fixed pages in the fixed page region are allotted to the object at the time of execution. Consequently, the object can be accessed directly based on the physical address. The garbage collection and page swapping processes are implemented only for address-unfixed pages, and the overhead of object access operation can be reduced.

Memory management technique for efficient execution of procedures in

A data retrieving method and apparatus capable of narrowing the range of retrieved data without changing the retrieving condition equation, capable of retrieving data by designating relative conditions, and capable of providing indices for helping a user to judge the properness of retrieved results. The data retrieving apparatus includes a term defining unit for defining a fuzzy term designated by a user and related terms and assigned to an item to be retrieved, by setting a retrieving condition range for each of the terms and a distribution curve representing an optimum distribution within the retrieving condition range for each term, a satisfaction degree evaluating unit for calculating a satisfaction degree of the retrieved data by using a function allocated to the distribution curve, and a condition analyzing unit for transforming the fuzzy term into numerical values to obtain a value-based retrieving condition equation.

Data retrieving method and apparatus providing satisfaction or agreement

An object-oriented data base management system connected to a plurality of data bases includes a class definition unit, a static inheritance processing unit included within the class definition unit, a message processing unit, a dynamic inheritance processing unit included within the message processing unit, and an object management unit. The object-oriented data base management system is of the type that defines the inheritance relationship between a plurality of classes and an arbitrary class and the inheritance priority order, the class being a basic unit of programming, and executes the data processing by solving the inheritance relationship between classes in accordance with the priority order. There is prepared, for each class, updatable inheritance solution status information which the static inheritance processing unit causes to be stored in a table. The inheritance solution status information includes status information and time information. The status information is representative of whether or not inheritance between the class and the superclasses can be completely solved, and the time information is representative of a time when the status is established. When a message processing is requested for an object of a class, the dynamic inheritance processing unit searches the method designated by the message while referring to the inheritance solution status information regarding the class and the superclass stored in the table.

System of object oriented inheritance using the temporal status of

A set of sorted columns of one table stored in a DB machine are binary-searched by a hardware in synchronism with data transfer when another table is read from a disk unit, to select a row to be joined. Where a key word sequence to be searched is stored in ascending or descending order, determination of a maximum address in an area in which key words smaller than a search key are stored and determination of a maximum address in an area in which the key words smaller than or equal to the search key are stored are parallelly executed to determine the store range in one searching.

Method and apparatus for processing data base

In a solid-state imaging device, a chrominance signal different from a signal to be obtained at a specified time among a plurality of chrominance signals to be successively obtained from a solid-state image sensor is interpolated with the chrominance signal obtained directly before the time of interpolation, or with the chrominance signal of a picture element corresponding to the signal to be obtained at the time of interpolation based upon the subject being achromatic. The particular signal to be used for the interpolation is decided based upon the difference between the signal to be obtained at the time of interpolation and a signal of the same chrominance obtained one cycle before the time of interpolation, or the differences between signals obtained directly before the time of interpolation and to be obtained directly after the time of interpolation and the chrominance signals obtained one cycle before the times of these signals.

Chrominance signal interpolation device for a color camera

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Ebina, Japan

Kazuhiro Satoh