Research on Systems Architecture to Support Technology Development for Production Scheduling Based on Case Database.
Project/Area Number  09680412 
Research Category 
GrantinAid for Scientific Research (C)

Allocation Type  Singleyear Grants 
Section  一般 
Research Field 
社会システム工学

Research Institution  HOKKAIDO UNIVERSITY 
Principal Investigator 
SEKIGUCHI Yasuki Hokkaido Univ., Fac. of Econ., Pro., 経済学部, 教授 (00091471)

Project Period (FY) 
1997 – 1999

Project Status 
Completed(Fiscal Year 1999)

Budget Amount *help 
¥3,100,000 (Direct Cost : ¥3,100,000)
Fiscal Year 1999 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1998 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1997 : ¥1,800,000 (Direct Cost : ¥1,800,000)

Keywords  decision support system / case base / production scheduling / modeling / problem definition / model / data independence / solver independence / オブジェクト指向 / スケジューリング / 実体関連モデル / 意思決定支援 
Research Abstract 
(1) A new information model, Generic EntityRelationship Model (GERM), and a new method for problem definition based on GERM were proposed. GERM is applicable for simulation as well as optimization problems. Architecture for a case database of problem definitions was proposed. A prototypical system of the case database based on the architecture was developed and effectiveness of the architecture was demonstrated. The case database can support users in describing real problems prior to mathematical formulation. (2) A mathematical model to a GERMbased problem definition is defined as a pure mathematical object. The mathematical model is connected with the respective problem definition through information called "unification condition." This technique provides a method to describe manytomany correspondence between mathematical model and problem definition. Based on the technique a case database to support mathematical formulation for problem definition can be developed and is convenient
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ly used for reusing mathematical models. Model/data independence is realized in the case database, because GERMbased problem definition is independent of numerical data. (3) We distinguish "user defined model" that is a mathematical model developed by a user from "standard model" used by a developer of a solver. They are connected to each other through information called "connection information." This is our method for model/solver independence. A solver to a standard model is invoked from the userdefined model connected to it. This improves reusability of solvers. Besides, the userdefined model is connected to a problem definition (cf. (2)). As a result, a user can invoke a solver from a problem definition with numerical data. (4) Experience on the prototypical model taught us that it is not easy for users to understand context of a GERMbased problem definition. This seems caused partly by the fact that objecttypes are fundamental elements of GERM. We proposed a method for inputting an objecttype through input of its instances. Less

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Research Products
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