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Comparative study on mode split discrete choice models

Journal of modern Transportation 2013年第4期21卷 266-272页

作者： Xianlong Chen Xiaoqian Liu Fazhi Li Guangzhou Transport Planning and Research Institute Transportation Planning and Design Division Architectural Design&Research Institute of Tongji University(Group) Co.Ltd.

Discrete choice model acts as one of the most important tools for studies involving mode split in the context of transport demand forecast. As different types of discrete choice models display their merits and restrictions diversely, how to properly select the specific type among discrete choice models for realistic application still remains to be a tough problem. In this article, five typical discrete choice models for transport mode split are, respectively, discussed, which includes multinomial logit model, nested logit model （NL）, heteroscedastic extreme value model, multinominal probit model and mixed multinomial logit model （MMNL）. The theoretical basis and application attributes of these five models are especially analysed with great attention, and they are also applied to a realistic intercity case of mode split forecast, which results indi- cating that NL model does well in accommodating similarity and heterogeneity across alternatives, while MMNL model serves as the most effective method for mode choice prediction since it shows the highest reliability with the least significant prediction errors and even outperforms the other four models in solving the heterogeneity and similarity problems. This study indicates that conclusions derived from a single discrete choice model are not reliable, and it is better to choose the proper model based on its characteristics.

关键词： Discrete choice model mode split NL MMNL HEV MNP

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Method and Experiments of Linearly splitting He-Ne Laser modes

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Chinese Journal of Lasers 1995年第1期B4卷 61-64页

作者： ZHANG Shulian HAN Yanmei(Dept.of Precision Instruments,Qinghua University,Baijing 100084,China) Tsinghua Univ Beijing China

ＭｅｔｈｏｄａｎｄＥｘｐｅｒｉｍｅｎｔｓｏｆＬｉｎｅａｒｌｙＳｐｌｉｔｔｉｎｇＨｅ－ＮｅＬａｓｅｒＭｏｄｅｓＭｅｔｈｏｄａｎｄＥｘｐｅｒｉｍｅｎｔｓｏｆＬｉｎｅａｒｌｙＳｐｌｉｔｔｉｎｇＨｅ－ＮｅＬａｓｅｒＭｏｄｅｓ... 详细信息

ＭｅｔｈｏｄａｎｄＥｘｐｅｒｉｍｅｎｔｓｏｆＬｉｎｅａｒｌｙＳｐｌｉｔｔｉｎｇＨｅ－ＮｅＬａｓｅｒＭｏｄｅｓＭｅｔｈｏｄａｎｄＥｘｐｅｒｉｍｅｎｔｓｏｆＬｉｎｅａｒｌｙＳｐｌｉｔｔｉｎｇＨｅ－ＮｅＬａｓｅｒＭｏｄｅｓ￥ＺＨＡＮＧＳｈｕｌｉａｎ；ＨＡＮ...

关键词： He-Ne laser mode split

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mode Suppression Phenomenon in a mode splitting He-Ne Laser

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Chinese Journal of Lasers 2000年第6期 20-24页

作者： Supported by Beijing Natural Science Foundation, China.FU Jie ZHANG Shulian HAN Yanmei JIN Yuye LI Yan (State Key Laboratory of Precision Measurement Technology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China)

The mode competition is significant in laser physics and applications. A priority frequency will suppress, in competition, a potential frequency within gain profile, and this becomes more obvious with greatly decreasing the spacing of the two frequencies. The small spacing is produced by splitting one mode into two orthogonally polarized frequencies in a 0.6328 μm He Ne laser with a short cavity length (150 mm long). By tuning the cavity length, the intensities of the two frequencies (e mode and o mode) under a variety of frequency spacings is measured. The suppression bandwidth for the potential mode is up to several hundreds of MHz and changes with the frequency spacing of the pair of frequencies. The intensities for the two frequencies are vary oppositely.

关键词： mode split laser mode competition suppressing bandwidth intensity tuning birefringence?

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