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Korea Emme Users’ Conference 21 April 2010

Top 7 Questions on Emme from Korean Users . Korea Emme Users’ Conference 21 April 2010. Prof. Jin- Hyuk Chung. Question #01. What Convergence Level is proper in the Highway Assignment?. Convergence Criterions. Networks in Korea. National 24,932 nodes 245 centroids 58,507 links.

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Korea Emme Users’ Conference 21 April 2010

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  1. Top 7 Questions on Emmefrom Korean Users Korea Emme Users’ Conference 21 April 2010 Prof. Jin-Hyuk Chung

  2. Question #01 What Convergence Level is proper in the Highway Assignment? Convergence Criterions Networks in Korea • National • 24,932 nodes • 245 centroids • 58,507 links • Number of Iterations • Relative Gap • Normalized Gap • Seoul Metropolitan Area • 21,601 nodes • 1,522 centroids • 56,453 links

  3. Question #02 Do you have any plans to improve the computational speed in the Highway Assignment? Conditions In Assignment Run Time • Intel Core2 Duo CPU 2.13GHz, RAM 2GB • Network • Seoul Metropolitan Area • Zone size : 1,522 • Assignment Method • Multi-class Assignment (3 modes) • Max. Iteration num. : 500 • Relative Gap : 0.001 • Emme • 6 hours • X company • 2 hours • (Path based Assignment : 30 mins)

  4. Question #03 EMME does not provide calibration modules forTrip Generation, Trip Distribution and Mode Choice Models. However, models can be applied by Matrix Calculation if we know parameters for models. Do you have plans for developing Model Calibration modulesor macro programs?

  5. Question #04 Currently, Users can useGeographic file (ESRI shape file etc.) in EMME/3. However, it does not interact with Network data in EMME so that useful GIS functions (e.g., Geo-Query) cannot be performed. Do you have plans for providing the useful GIS functions like Geo-Query?

  6. Question #05 In Transit Assignment, various parameters such as dwelling time, boarding time and waiting time should be determined by users. However, they significantly 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 parameters?

  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 Optimal strategy algorithm, which is unrealistic in Korea. Users usually adoptTransferPenalty to control transfer volume. Do you have any other methods to handle the problem?

  8. Question #07 Sub-area analysis is a very useful method in various cases, which requiresto 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 environment?

  9. Thankyou

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