 This
site provides a simulation study program for a monocentric city
where students can alter parameter values and observe how characteristics of cities change
in response. For example, students can see how rental rates for land change by altering
commuting cost, income, and so on.The site also provides simulation programs for an
open urban model and a closed urban model based on the assumptions that households
in a
city have the same income and preference. We assume a monocentric city
with a dense hub-and spoke commuting network. Originally, all programs of
the site is based on professor John
Yinger‘s Excel programs. You can easily find other major assumptions of urban models
from Urban Economics textbooks.
Currently, the site provides simulation programs for an open and closed model. Later,
urban models that have two income groups will be added, and furthermore, problem sets for
exams and homework, that are classified into several categories according to level of
difficulty, will be posted.
The simulation program for an open model is open to the public, but the closed one is
not. To make use of other simulation programs for a class, please contact the programmer
(Some fees can be charged). The simulation programs are not fully developed now and terms
and conditions for use are not determined.
Currently students can change six parameter values to perform simulation studies with
urban models. The first five parameters are common in both an open and closed model. In an
open urban model, “utility index” is the last parameter, while in a closed
model the number of residents in a city is set.
To save the space of windows of simulation program, abbreviated labels are used.
Simulation results are sensitive to parameter values, so ranges of parameter values are
set by the programmer to generate graphs. The following is explanation of the abbreviated
terms and ranges of values students can modify. Values in parentheses are default values
for the base simulation set by the programmer and cannot be altered by users. |
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- Simulation results are sensitive to parameter values, so DO NOT assign a parameter value
out of the above range for new simulation. In open urban model,
especially, simulation
results are very sensitive to Y and VI.
- Once accessing a simulation program, you will see windows titled either “Open Urban
Model Simulation” or “Closed Urban Model Simulation.” Under the title you
will see brief directions for simulations. Basically, you can choose one of seven
simulation methods. Click the “Analysis” menu on the top of the window to select
a simulation method. Selecting a method will lead you to another window where you can
actually perform simulations.
- Each simulation window does NOT have a “PRINTING” button. In order to print
the graphs, click the “Print Screen” key of the keyboard with holding the
“Control key” down. Pressing the two keys together puts what’s on the screen in
clipboard of your computer. By clicking “Copy icon” of Microsoft word, you can
paste the copied window on your word document.
- Remember that you cannot change values in the second column labeled “Base.”
The values in the second column are for the case of base model, and black
line in a graph represents the base model. You can only change values in the first column
labeled “New,” which is represented by a red line.
- If you set parameter values out of the allowed range, the curve for a new simulation in
the graph will become a horizontal line or it will disappear and you will find
unreasonable values in the text box.
- The simulation programs of this page may run more slowly on Netscape than on Microsoft
Internet Explorer. If simulation programs run slowly, try running them on Internet
Explorer. You may also have to download JAVA Runtime Environment (JRE). If you cannot find
two buttons below, click somewhere in the middle under the label, “Click a Button to
perform urban model analysis !!!” then follow the directions popping
up.
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- You will be asked to type in userid and password for closed model simulation. You can
get your userid and password from the programmer by sending an email to yskwon@icu.ac.kr.
- Acknowledgement: Seungmi Yang, MLS candidate at
Syracuse University, provided tremendous
programming
help.
Number of Visitors Since April 10, 2001
Updated on April 10, 2001 by Youngsun Kwon
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