YONSEI UNIVERSITY

Korea Emme Users’ Conference

21 April 2010

Prof. Jin-Hyuk Chung

YONSEI UNIVERSITY 2

Question #01

What Convergence Level is proper in the Highway Assignment?

Convergence Criterions

Number of Iterations

Relative Gap

Normalized Gap

Networks in Korea

National- 24,932 nodes- 245 centroids- 58,507 links

Seoul Metropolitan Area- 21,601 nodes- 1,522 centroids- 56,453 links

YONSEI UNIVERSITY 3

Question #02

Do you have any plans to improve the computational speed in the Highway Assignment?

Conditions In Assignment

Intel Core2 Duo CPU 2.13GHz, RAM 2GBNetwork

- Seoul Metropolitan Area- Zone size : 1,522

Assignment Method- Multi-class Assignment (3 modes)

Max. Iteration num. : 500Relative Gap : 0.001

Run Time

Emme- 6 hours

X company- 2 hours

(Path based Assignment : 30 mins)

YONSEI UNIVERSITY 4

Question #03

EMME does not provide calibration modules for Trip Generation, Trip Distribution and Mode Choice Mod-els. However, models can be applied by Matrix Cal-culation if we know parameters for models. Do you have plans for developing Model Calibration modules or macro programs?

YONSEI UNIVERSITY 5

Question #04

Currently, Users can use Geographic file (ESRI shape file etc.) in EMME/3. However, it does not interact with Network data in EMME so that useful GIS func-tions (e.g., Geo-Query) cannot be performed.

Do you have plans for providing the useful GIS func-tions like Geo-Query?

YONSEI UNIVERSITY 6

Question #05

In Transit Assignment, various parameters such as dwelling time, boarding time and waiting time should be determined by users. However, they signif-icantly influence the analysis results

Do you have any guidelines or previous research works for the Transit Assignment Parameters?

How do Users in other countries decide the parame-ters?

YONSEI UNIVERSITY 7

Question #06

Transit Assignment algorithm In EMME is Optimal Strategy, in which headway is the most important parameter.

Often, transfer demand is overestimated by the Op-timal strategy algorithm, which is unrealistic in Ko-rea.

Users usually adopt Transfer Penalty to control trans-fer volume. Do you have any other methods to han-dle the problem?

YONSEI UNIVERSITY 8

Question #07

Sub-area analysis is a very useful method in various cases, which requires to extract Sub-Network and to aggregate O/D matrix.

Currently, EMME does not provide a module of Sub-Area analysis. Can you suggest any possible ways to perform Sub-Area analysis under EMME environ-ment?

YONSEI UNIVERSITY 9

Thank you