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Research Bulletin of the NACSIS, No.3 (1990.3)

Preface (Japanese)

1. Akira MIYAZAWA(National Center for
On the Korean Character Codes (Japanese)

This paper introduces Korean character codes used in the Republic of Korea, and discusses interchange of the East Asian text databases. A concept of "code space" is introduced as a set of code values used for representation of graphic characters. Character sets are invoked into code space to form a character encoding system. ISO 2022, which is a basic standard for the character coding system, is explained from the viewpoint of code space. Character code environment of the NACSIS information services, which are N-1 NVT code, KEIS code of VOS3, and a widely used personal computer systems character code shift-JIS are analyzed. Then hangul codes of the Korean character sets are classifiled into three types, which are N-byte code, combination type and complate type. Examples of these types are shown. Features pf the rapidly disseminating standard code KS C 5601-1987 is explained, and some discussions about this character set are introduced. As the code space of these character sets, following examples are shown----IBM host code, the standard usage of the KS C 5601, and some extention methods influenced by the Japanese shift-JIS code. Invocations of character sets into these code spaces are all static and fixed.
However, for the interchange of the East Asian text database, more than four character sets are required, and larger code space or dynamic invocation of character sets is mandarory. It is new problem that existing operating systems can not handle such large code space or dynamic invocation.

2. Choon Tack LEE
Comparative Analysis of Character Set/Code between Korean and Japanese Standard(Japanese)

National standards on Hanja/Kanji charachter exist in Korea and Japan, KSC5601 and JISX0208 respectively. Both national standards include several thousands Hanja/Kanji characters, but are not idential. The paper discusses coverage and characteristics of Korean Hanja by KSC under three features such as different pronunciation; same form-different meaning & pronunciation; same form & meaning-different pronunciation. Characteristics of national or "Sino-Korean" characters, about 500 are known to exist, are described. A comparison between KSC and JIS is made by form, by number, by variations. Tasks are discussed for international (ragional) standardization between two national standards.

3. Kyo KAGEURA and Keizo OYAMA, Akira MIYAZAWA, Masamitsu NEGISHI, Shunichi.TORII, Hiroyuki KINUGAWA
A Full-text Retrieval System Reflecting the Logical Structure of Documents (Japanese)

Full-text databases have recently become popular as a type of database services. However, there are some problems in using these databases, e.g. they are difficult to use without producing great noises. NACSIS has been pursuing the research on a new full-text retrieval system to solve these problems, in parallel with servicing full-text retrieval operations that reflect the logical structure of documents. System configuration of the new full-text retrieval system is also mentioned.

Conceptual Framework for Document Delivery Services Based on Electronic Library (Japanese)

A new conceptual framework for implementing document delivery services based on new technical methodologies such as fulltext database, multimedia document system and distributed communication environment is described. These new methodologies can be employed by library patron and have a profound potential benefits for document delivery services. The primary focus is on the relationship between copyrights and resource sharing in the feature of document delivery. And some important problems in the context of library systems in the future are also discussed.

5. Teruo KOYAMA
Roles of Tasks in Knowledgr-based Systems (Japanese)

6. Teruo KOYAMA
Process Modeling of Mechanical Conceptual Design (Japanese)

7. Takashi HAMADA and Kazuhiko OKUBO
A Multiprocessor Database Machine for Very Large Relational Database (Japanese)

In this paper the authors discussed a database machine architecture for a very large database, which requires heavy processor load in relational database management. The proposed machine is highly-integrated parallel computer system and in such architecture a distribution scheme of processor load has a great influence on the preformance of operations.
The authors proposed algorithms for a parallel processing of operations and for routing control in multistage interconnection network. The performance of the proposed system is evaluated by simulation and traffic analysis and it is found that the proposed machine can cope with the problems for database environment in the future.

8. Shoichiro ASANO and Shiro ANDO
Ruting Control for Multi-destination Traffic (Japanese)

9. Hisao YAMADA
On Research and Development Activitied in U.S.A. and in Japan (Japanese)

10. Hisao YAMADA
Testing Procedures, Homogeneous Culture, and Creativity Cultivation : on selection procedures in education and in research (Japanese)