限定的気象情報で利用可能な空間リスク評価手法とニントゥアン原発ゾーンプラニングへの応用

国立大学法人長岡技術科学大

An Investigation of Intra-Household Interactions in Travel Mode Choice

AN INVESTIGATION OF INTRA-HOUSEHOLD INTERACTIONS IN TRAVEL MODE CHOICE This thesis develops a modelling framework to integrate intra-household interactions with tour-based mode choice. The findings provide evidence of intra-household interactions in travel mode choice of each household member and highlight factors associated with joint household activities and shared ride arrangements, with a distinction between weekdays and weekends. The results indicate that household resources, mobility and social constraints, and opportunities to coordinate household members’ activities play an important role in arranging joint household travel. Also, modelling outputs signal the differences that interpersonal interactions make to model elasticities and the implications for transport policy. The originality and the contribution of this research lie in four main areas. First, it tests the relevance of interactions between household members to household mode choice decisions and adds an additional ‘layer of interactions’ to the activity-based modelling framework. The study offers an analysis of household travel decisions embedding context and situation effects, thereby reflecting more realistically the nature of travel decisions. Second, this study offers a typology of joint household tour patterns embedded in a modelling approach which permits a variety of activity-travel patterns amongst all household members together with intra-household interactions. Third, the research provides evidence on the effects of land use factors measured at the micro-level so as to identify which aspects of the built environment are most likely to support policy change for sustainable transport choices. Finally, by separating weekend activity-travel from their weekday counterparts, this study is able to quantify empirically differences which suggest different transport management measures aimed to alleviate traffic congestion and promote public transport use

The Atiyah-Bott formula and connectivity in chiral Koszul duality

The ⊗*-monoidal structure on the category of sheaves on the Ran space is not pro-nilpotent in the sense of [3]. However, under some connectivity assumptions, we prove that Koszul duality induces an equivalence of categories and that this equivalence behaves nicely with respect to Verdier duality on the Ran space and integrating along the Ran space, i.e. taking factorization homology. Based on ideas sketched in [4], we show that these results also offer a simpler alternative to one of the two main steps in the proof of the Atiyah-Bott formula given in [7] and [5]

Defects Studies in I -Ga2O3 Using an Optimized Hybrid Functional

I -Ga2O3 is a very important semiconductor. However, there is still little known about the defects in I -Ga2O3. Experiment alone is not enough to understand, Deak et al. have found tthe hybrid functional with the parameters I /-= 0.26 and I = 0.00 is the optimal HSE for I -Ga2O3 defects studies.This optimized hybrid functional reproduces not only the band gap, but also satisfies the generalized Koopmansa theorem. Herein, the optimized hybrid functional and a modification of the charge correction process were utilized for I -Ga2O3 with the results as follows: a A consistent description of observed carrier trapping by intrinsic defects in I -Ga2O3 was given. a The UV bands can be explained by the self-trapped holes states. The blue band mainly originates from singly negative Ga-O vacancies, and the green band is caused dominantly by interstitial O atoms. In N-doped samples, a nitrogen substitutional on the tetrahedral oxygen site reproduces the observed red luminescence. a a The calculated hyperfine tensor agrees well with the EPR measurement. The calculated results confirm that Mg cannot act as a shallow acceptor in I -Ga2O3.

Homological stability and densities of generalized configuration spaces

We prove that the factorization homologies of a scheme with coefficients in truncated polynomial algebras compute the cohomologies of its generalized configuration spaces. Using Koszul duality between commutative algebras and Lie algebras, we obtain new expressions for the cohomologies of the latter. As a consequence, we obtain a uniform and conceptual approach for treating homological stability, homological densities, and arithmetic densities of generalized configuration spaces. Our results categorify, generalize, and in fact provide a conceptual understanding of the coincidences appearing in the work of Farb--Wolfson--Wood. Our computation of the stable homological densities also yields rational homotopy types, answering a question posed by Vakil--Wood. Our approach hinges on the study of homological stability of cohomological Chevalley complexes, which is of independent interest

The role of attitudes and public transport service on vehicle ownership in Ho Chi Minh, Vietnam

Empirical evidence suggests that urban form has a strong influence on travel behaviour. This finding, however, has been challenged by the debate on the confounding effects of subjective dimensions such as individual attitudes and preferences (the self-selection hypothesis). Residential self-selection has been found to significantly influence travel behaviour though the effects of land use remain important. Although people have more options than just residential choice to self-select, researchers have focused on residential self-selection only, mostly in the US. The paper examines the effects of attitudes and public transport service on household multiple vehicle ownership behaviour, controlled for socio-demographic and land use characteristics. This study contributes empirical results of Generalised Nested Logit models using large scale household interview survey data collected in Ho Chi Minh metropolitan area, Vietnam. The study finds that both subjective and objective dimensions of the built environment such as bus coverage, bus operators’ attitudes, walking and cycling conditions, and the diversity of land use at residential locations are important to multiple vehicle ownership behaviour while the effects of self-selection are relatively modest