Faculty Profiles - MURAKAWA Takehiko

Published Papers - MURAKAWA Takehiko

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Automatic Conversion of SQL statements into NoSQL queries

MURAKAWA Takehiko, ENDO Junichi, MATSUO Kazunori, NAKAGAWA Masaru

情報知識学会誌 ( Japan Society of Information and Knowledge ) 22 ( 2 ) 126 - 131 2012.05

For storing and managing enormous data, NoSQL databases have been employed recently on behalf of RDB since NoSQL is high-performance and scalable. However the differences of the data structures and the manipulation languages give the developers pause in making the shift to the systems using NoSQL. In this paper, we report a converter which takes an SQL statement as input to generate an equivalent code of target language of NoSQL. MongoDB and HBase were selected as the target languages while we attempted to implement an SQL analyzer and coordinate the code segments of the programming languages. As the result of the evaluation experiment, 13 MongoDB queries and 9 HBase ones were derived from 32 example SQL statements.

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Full-text retrieval system for humanities researches

Takehiko Murakawa, Yukiharu Watagami, Keigo Utsunomiya, Masaru Nakagawa

Frontiers in Artificial Intelligence and Applications ( IOS Press ) 240 118 - 127 2012

The full-text retrieval system which is available in Internet-incapable places is reported. To use the retrieval service in a quick and efficient manner, there are properties which the system should require. Portability, accuracy and timeliness are defined as requirements for practical use and we constructed the system for satisfying all these properties. Moreover we supplied the registration support and implemented a unique bookmark feature in order that the system can fulfill the properties named installation-facility and reusability. Evaluation experiments made sure that the added features were useful for the information retrieval. Since the system is developed for supporting literature searching by humanities researchers, it does not only accept a variety of document files but split Excel files by row into the records at the time of registration. Application of the service to source code management is also discussed. © 2012 The authors and IOS Press. All rights reserved.

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Full-text Search Engine Selection Support System

KAWANAKA Tatsuma, WATAGAMI Yukiharu, MURAKAWA Takehiko, NAKAGAWA Masaru

Journal of Japan Society of Information and Knowledge ( Japan Society of Information and Knowledge ) 21 ( 2 ) 191 - 196 2011.05

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Decision-Aid Module for Transcription of Ancient Buddhist Sutras

福岡整, 村川猛彦, 中川優

じんもんこん2010論文集 2010 ( 15 ) 299 - 304 2010.12

An approach to Full-text Search for Bibliographic Data of Ancient Documents by means of Stand-alone Operation

WATAGAMI Yukiharu, MURAKAWA Takehiko, UTUNOMIYA Keigo, NAKAGAWA Masaru

Joho Chishiki Gakkaishi ( 情報知識学会 ) 20 ( 2 ) 189 - 194 2010.05

It is not possible to retrieve something that one wants deep in the mountains, using the full-text search system which we have developed for bibliographic data of documents in temple, since the system needs the access to the server. In this paper, we report a new system in stand-alone mode which works with an Ultra Mobile PC without communicating to any external computer. For constructing the system, the Windows operating system is employed instead of Linux, while the bibliographic data and the search engine software are unchanged. We implemented the interfaces for record registration and annotation as well as the features which the conventional system offered. The retrieval experiments made no difference between both search systems with regard to the retrieval results, and showed that the stand-alone system displayed results within two seconds after the user gave the search term.

Graphical Expression of SQL Statements Using Clamshell Diagram

MURAKAWA Takehiko, NAKAGAWA Masaru

IEICE Trans. Inf. & Syst. ( The Institute of Electronics, Information and Communication Engineers ) 93 ( 4 ) 713 - 720 2010.04

Thinking process development diagram is a graphical expression from which readers can easily find not only the hierarchy of a given problem but the relationship between the problem and the solution. Although that has been developed as an idea creation support tool in the field of mechanical design, we referred to the restricted version as clamshell diagram to attempt to apply to other fields. In this paper we propose the framework for drawing the diagram of the SQL statement. The basic idea is to supply the hierarchical code fragments of a given SQL statement in the left side of the diagram and to put the meaning written in a natural language in the right. To verify the usefulness of the diagram expression, we actually drew several clamshell diagrams. For three SQL statements that are derived from the same specification, the resulting diagrams enable us to understand the difference visually.

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Evaluation of Support System for Revising Buddhist Canons using Subversion

福岡整, 村川猛彦, 野田大地, 中川優

じんもんこん2009論文集 2009 ( 16 ) 61 - 66 2009.12

Graphical Expression of SQL Statements using Clamshell Diagram

MURAKAWA Takehiko, NAKAGAWA Masaru

Joho Chishiki Gakkaishi ( 情報知識学会 ) 19 ( 2 ) 218 - 223 2009.05

Thinking process development diagram is a graphical expression from which readers can easily find not only the hierarchy of a given problem but the relationship between the problem and the solution. Although that has been developed as an idea creation support tool in the field of mechanical design, we referred to the restricted version as clamshell diagram to attempt to apply to other fields. In this paper we propose the framework for drawing the diagram of the SQL statement. The basic idea is to supply the hierarchical code fragments of a given SQL statement in the left side of the diagram and to put the meaning written in a natural language in the right. After describing the formulation, we show a few examples of SQL statements and the corresponding diagrams. Moreover we discuss a support system, namely a database of SQL statements, for understanding and writing down the statements.

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Full-text Search System for Bibliographic Data of Ancient Documents

村川猛彦, 宇都宮啓吾, 中川優

情報処理学会論文誌データベース（TOD） ( 情報処理学会 ) 1 ( 3 ) 96 - 107 2008.12

Ancient documents and scriptures in the temples provide a clue to the clarification of various historical phenomena such as their background and the human relationships, due to the colophons and other bibliographic elements. We constructed a document retrieval system powered by the full-text search engine Hyper Estraier, where 44,135 records are registered. To discharge the problems of time-consuming or error-prone input of search terms, we improved the search interface so that the users can see the resulting documents with the keywords highlighted for further search. For that purpose, we found 6,690 keywords in bibliographic data. The words about eras and persons were produced or extracted and subsequently filtered through the full-text search. Those about temples and places were obtained by a text-mining approach aiming at the suffix characters. The keywords are stored in a relational database apart from the full-text index. Using the database, we implemented the feature of calculating the position of the keywords for a given string efficiently. The experiment showed that the precision and the recall of the detected keywords on 120 bibliographic documents were greater than 90%.

Support System for Revising Buddhist Canons using Subversion

丁敏, 村川猛彦, 福岡整, 中川優

じんもんこん2008論文集 2008 ( 2008 ) 61 - 66 2008.12

Keyword Extraction Methods for Bibliographic Information of Ancient Documents

MURAKAWA Takehiko, YAMANAKA Katsuma, UTSUNOMIYA Keigo, NAKAGAWA Masaru

Joho Chishiki Gakkaishi ( 情報知識学会 ) 18 ( 2 ) 87 - 92 2008.05

Ancient documents and scriptures provide a clue as to their background and the human relationships, due to the colophons and the bibliographic data. Using the full-text search system that we have developed, we attempt to extract the helpful keywords. The words of Japanese year are made of the imperial era names and the numbers to filter through the full-text search. Temple names are obtained by a text-mining approach whose first step is to find the Chinese character of temple. The keywords are split character by character and formed by means of trie to store in a database. Moreover we improve the search interface so that the users can see the resulting documents with the keywords highlighted for further search.

Healthcare Supporting Systems over the Internet

SATOMURA Hiroaki, TANAKA Takehiko, YOSHIHIRO Takuya, NAKAGAWA Masaru

Journal of Japan Society of Information and Knowledge ( Japan Society of Information and Knowledge ) 16 ( 2 ) 59 - 62 2006.05

We have constructed the healthcare supporting systems for aged people, for patients with diabetes, and for pediatric patients and their families. In these systems, the people in need of nursing care actively and regularly send the healthcare data while the medical personnel view them to make use of subsequent medical services or nursing cares. The architecture is almost common to these systems in the sense that there exists a web and database server together with Internet-enable devices. However, since the data in the databases and to be exchanged were entirely difficult, the systems have been designed, implemented and maintained separately. In this paper, we review the features of the systems, and discuss the united, versatile database system for remote healthcare support.

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A Database System for the Picture Files of Buddhist Canons

Nino Yohei, Tanaka Takehiko, Zhang Rong, Nakagawa Masaru, Aoki Susumu, Utsunomiya Keigo, Ochiai Toshinori

Joho Chishiki Gakkaishi ( Japan Society of Information and Knowledge ) 15 ( 2 ) 15 - 18 2005

We have taken the picture images of all the Buddhist canons in the possession of Kongoji, using digital cameras. Although those images are so vivid and easy to view, it is quite hard to find some character or phrase from that file. In addition, it is not effective or practical to manage tens of thousands of the images only by means of their file names. For smoothing these difficulties away, we are constructing a database system together with a prototype viewer which meets viewability and searchability. The searchability is based on the existing text files of the canons, since most canons in Kongoji correspond to those of Taisho Tripitaka whose text files are available on the Internet. Therefore we attempts to recognize the character regions of the image files automatically, and to develop the interfaces which help one relate the location of the character region to the position of the character in the text file.

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Database System of Priests in Heian and Kamakura Periods: Summary and a Subsequent Activity

TANAKA Takehiko, FUKIMBARA Kenji, UTSUNOMIYA Keigo, NAKAGAWA Masaru

Joho Chishiki Gakkaishi ( Japan Society of Information and Knowledge ) 14 ( 3 ) 44 - 49 2004

We present an outline of our developing database system of priests in Heian and Kamakura Periods, and then, we report an activity over the last year in which we attempt to display the genealogical tables using SVG. In developing the database system, we have focused on (1) how to register and retrieve literature information, (2) how to register and retrieve person information, (3) how to find and display the human relationship between two persons, and (4) how to make up genealogical trees. By using this system, the re-searchers can register, search, and browse the records efficiently, while they will find novel human relationships behind the genealogical trees. In contrast to the expectations, the displayed genealogical tables have some problems and limitations due to the implementation with Java. To make the tables easy to read and use, we consider and partially implement the visualization system with SVG. We attempt to realize the representation of Chinese characters by embedding the glyph data in the generated SVG files.

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Database System of Priests in Hian and Kamakura Periods

TANAKA Takehiko, FUKIMABARA Kenji, UTSUNOMIYA Keigo, NAKAGAWA Masaru

Joho Chishiki Gakkaishi ( Japan Society of Information and Knowledge ) 13 ( 2 ) 18 - 31 2003

Among the researchers who investigate the society in Heian and Kamakura periods, a comprehensive database of the persons and literatures together with a user-friendly retrieving service has been required. In this paper, we present a database system based on Buddhist scriptures and genealogical trees of both the blood relationship and the master-pupil relationship. We experimentally construct the database, while we implement the retrieval services which apply to the database. With these services, the user can not only see a single genealogical tree but obtain two genealogical trees to understand the human relationship between the specified two persons. Moreover we consider how to store a number of records of person and literature smoothly in the database. Finally, we propose and implement a constructing method of the genealogical trees by a bottom-up approach. By using this system, the researchers can register the records efficiently, and they will find novel human relationships behind the genealogical trees.

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Database System for Japanese Buddhists in Heian and Kamakura Periods

Tanaka Takehiko, Fukimbara Kenji, Nakagawa Masaru, Utsunomiya Keigo

Proceedings of Annual Conference, Japan Society of Information and Knowledge ( Japan Society of Information and Knowledge ) 10 15 - 18 2002

We develop a database system for managing the data of the people and their relationships in Heian and Kamakura Periods of Japan. The system cannot only retrieve persons from several genealogical tables but also find a key person between two given persons. Human relationships can be displayed as genealogical trees according to blood or denominations. Moreover we attempt to supply a registration method using GUI, where genealogical trees with level one are registered and later the trees are unified into larger ones. Since the information for data management such as the person's serial number is hidden, the users can register the records and view the genealogical tables without thinking of the database management system.

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Published Papers - MURAKAWA Takehiko