SYSTEM FOR DEFINING SIMULATION MODEL

• US 20090094007A1
• Filed: 10/04/2007
• Published: 04/09/2009
• Est. Priority Date: 10/04/2007
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: KONNO, Hiroyuki, Ogura, Takahiro, Funaki, Kenichi, Nagamatsu, Akira
• Granted Patent: US 7,805,284 B2
• Time in Patent Office: Days
• US Class Current: 703/6
• CPC Class Codes: G06Q 10/00 Administration; Management

Abstract

An issue to be settled by the present invention is to define a simulation model in accordance with the structure of a casual relation easy to be understood by human and to shorten greatly a simulation program development period. A simulation program is automatically generated by extracting, as nodes, specific items such as phenomenon, events and targets of constituent elements of economy, society or the like regarded as a system, coupling the nodes with arcs to define the structure of the casual relation, and defining a variable necessary for calculating metrics and a calculation formula therefor, relative to a simulation model inheriting the defined structure.

Claims

1. A simulation model defining system for automatically generating a simulation program for simulating a behavior of economy or society regarded as a system, a relation between constituent elements of the system being represented by a casual relation, comprising:

a casual relation diagram defining unit for extracting, as nodes, specific items such as phenomenon, events and targets of said constituent elements, creating a casual relation by coupling said nodes with arcs, and setting metrics quantitatively representing a state amount to each of said nodes, to draw a casual relation diagram;

a node table for storing a node name and drawing coordinates of each of said nodes;

an arc table for storing node information on each of said nodes coupled to each of said arcs;

a simulation model defining unit for adding a variable necessary for calculating said metrics to a simulation base model inheriting a structure of the casual relation of said casual relation diagram, explicitly writing a flow direction of information by extending a link between said metrics and said variable, and setting a calculation formula relative to said metrics and said variable, to define a simulation model;

a variable table for storing information on a variable name, a variable type, a calculation model for identifying a calculation formula to be set, and the calculation formula, for each of said metrics and said variable;

a link table for storing information on said variable connected to each of said link;

a database for storing data of each of said tables and collectively managing the data; and

a simulation program generating unit for automatically generating a simulation program in accordance with the data registered in said database.

2. The simulation model defining system according to claim 1, wherein said simulation program generating unit:

preparing in advance program templates of three types including “

for data storage”

, “

for calculation” and

“

for graph function”

;

if the variable type in said variable table is a level variable “

for data storage”

, adopting the program template for data storage as the calculation formula of the subject variable;

if the variable type in said variable table is not a level variable for data storage and the calculation model is “

for calculation”

, adopting the program template for calculation as the calculation formula of the subject variable; and

if the variable type in said variable table is not a level variable for data storage and the calculation model is “

for graph function”

, adopting the program template for graph function as the calculation formula of the subject variable, to generate the simulation program.