Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jmateco.2016.12.007

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.trb.2015.07.021

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DOI： 10.1007/978-3-031-71686-7

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Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.trb.2023.05.003

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Language：Japanese   Publisher：Japan Society of Traffic Engineers  

This study develops an urban economic analysis method that can measure changes in the spatial distribution of economic activity due to increased risk of flooding, which contributes to the assessment of the long-term impact of transportation infrastructure development. For this purpose, we construct a model that can take into account the risk of flooding, based on the models of previous studies that consider agglomeration economies. It is shown that the model has a potential function that enables large-scale numerical calculations. In addition, we present a systematic parameter setting method that enables analysis in real space. Furthermore, we conduct a counterfactual experiment on the increased risk of flooding in the Kanazawa urban employment zone. We confirm that the results reflect the characteristics of the model and that it is possible to measure the long-term impact of transportation infrastructure development. We also discuss measures to reduce flood damage based on the changes in the flooded area population.

DOI： 10.14954/jste.9.2_a_186

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

This study develops a quantitative urban model based on Fujita and Ogawa (1982) that considers traffic congestion. To this end, we show the existence of a potential function in the developed model and present an efficient numerical analysis method using the properties of the potential function. We then show that the model can explain the endogenous formation of polycentric urban configurations by analyzing the developed model in a two-dimensional lattice space. Furthermore, through an example analysis of the Kanazawa urban employment area, which consists of 1, 656 districts and 110, 000 links, it is shown that the model can efficiently perform calculations for complex road networks.

DOI： 10.2208/jscejj.23-00091

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

In recent years, theories based on spatial economics have been applied to econometric analysis. However, the analytical framework only outputs the result that "improvement of inter-regional transportation always increases the population of regional cities (decreases the population of large cities), " which is the opposite of the long-term trend of population distribution change in Japan (e.g., population increase in large cities). This is an important issue because it means that proper prediction of the impact of transportation improvements is impossible. This study develops an econometric method to solve this problem by applying the theory of monopolistic competition, which can take into account price competition among firms. Then, through an econometric analysis for Japan, we show that this method can output the result that "interregional transport improvements increase the population of large cities.

DOI： 10.2208/jscejj.22-00115

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

Under the global warming condition, intensification of heavy rainfalls are anticipated and it is difficult to realize a flood resilient-society by only structural counter measures (e.g., levee, dam). Flood management on the premise of inundation is indispensable. In Japan, future population decline is predicted and surplus lands will be created in lower flood risk areas. It is expected that the damage of flood disaster will be reduced by utilizing surplus lands in low-risk areas. In this study, based on inundation simulation results, potential flood economic losses were estimated for Kakehashi River basin in Ishikawa Prefecture, Japan. For the condition of population decline, relocation of households and firms were simulated by a computable urban economic (CUE) model. When households and firms relocate under a population decline, the potential flood economic losses were reduced by 14.1%. When relocation from high-flood-risk areas to surplus lands in low-risk areas were promoted in CUE model by changing ratios of urbanization promotion area, the flood economic losses were reduced by 16.4%. In the past study for the Kakehashi River basin, the flood economic losses could be reduced by about 40% when the relocation to the low-risk surplus lands is the maximum. These results indicate that relocation to low-flood-risk areas will not proceed simply by relying on economic principles. Effective relocation measures are indispensable to maximize the utilization of surplus lands and realize flood-resilient society.

DOI： 10.2208/jscejj.22-00117

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Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1007/s11067-021-09557-2

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Other Link： https://link.springer.com/article/10.1007/s11067-021-09557-2/fulltext.html

Publishing type：Research paper (scientific journal)   Publisher：Wiley  

DOI： 10.1111/jors.12582

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jors.12582

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejipm.78.4_166

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

Typically, the parameters of land use models are stepwisely estimated and calibrated because of some practical difficulties, e.g., satisfying sign conditions. However, this estimation method lacks the reliability from the theoretical viewpoint as the parameters that should be estimated simultaneously are separately estimated one by one. This study is the first attempt to mitigate this problem. We aim to introduce a Bayesian approach into the estimation of land use models. Specifically, we conduct a whole procedure of an econometric analysis using land use models; for a given land use model, we simultaneously estimate their parameters including the variable selection, confirm the reproducibility of the data, and conduct the counterfactual experiment. Both the estimation result and its comparison with the result by the conventional method suggested the superiority of Bayesian approach as well as its potential for expansion.

DOI： 10.2208/jscejipm.77.5_i_469

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.14954/jste.8.2_A_222

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejipm.76.4_314

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Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejipm.76.2_100

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier B.V.  

DOI： 10.1016/j.jedc.2018.05.002

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Authorship：Lead author,　Corresponding author   Language：Japanese  

DOI： 10.2208/jscejipm.74.64

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Language：Japanese  

DOI： 10.2208/jscejipm.74.50

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

This study conducts spatial computable general equilibrium (SCGE) analyses that consider agglomeration economies and workers' relocation. To this end, we modify the SCGE model developed by Takayama et al.¹⁾ to introduce intra-regional transportation costs. We then examine the effects of changes in transportation costs on the spatial distribution of workers in Japan and show that the prediction of the model is roughly consistent with the data. In addition, we demonstrate through an example that hysteresis phenomena can be observed in the model.

DOI： 10.2208/jscejipm.74.82

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Language：Japanese  

DOI： 10.2208/jscejipm.74.140

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/jors.12306

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/ijet.12120

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1111/jors.12290

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Language：Japanese  

DOI： 10.2208/jscejipm.73.40

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

 In economic geography, central place theory¹⁾ envisaged the emergence of hexagonal distribution of cities from uniformity. However, rigorous verification of the existence of hexagonal patterns is missing over years. To support this theory, Ikeda et al.²⁾ introduced a group-theoretic Fourier spectrum analysis in a regular-triangular lattice and detected hexagonal patterns of cities in Southern Germany and Eastern USA. However, the existence of geometrical patterns other than hexagons remains unknown. This paper, considering square patterns, introduced a square lattice version of a group-theoretic Fourier spectrum analysis. Using this analysis in Southern Germany, we indicated a possibility of the square lattice as candidate of a spatial platform in a population distribution analysis.

DOI： 10.2208/jscejipm.73.148

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

 This study incorporates the standard bottleneck model into the traditional residential location model to develop a model in which heterogeneous commuters choose their residential locations and departure times from home in a monocentric city. We characterize its equilibrium with and without congestion tolling and clarify that introducing an optimal congestion toll alters the urban spatial structure. Furthermore, we demonstrate through examples that congestion tolling can lead to urban sprawl. This result contrasts with the standard results of traditional residential location models with static flow congestion, which predict cities to become denser with road pricing.

DOI： 10.2208/jscejipm.73.219

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

This study develops a spatial computable general equilibrium model that considers agglomeration economies and mobility of production factors, including labor and capital. To this end, we extend the new economic geography models of industrial location and agglomeration with factor mobility. We then present parameter estimation and calibration procedures and an approach for obtaining the stable equilibrium that emerges with changes in structural parameters. Applying these methods, this study quantifies the effects of the trade cost reductions in Japan to clearly describe characteristics of the developed model.

DOI： 10.2208/jscejipm.72.211

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Language：Japanese   Publisher：Japan Society of Traffic Engineers  

This study clarifies the impact of flextime and parking congestion on the temporal distribution of traffic demand and morning rush hour congestion. To this end, we develop a model based on Arnott et al. (Arnott, R., de Palma, A., and Lindsey, R.: A temporal and spatial equilibrium analysis of commuter parking, Journal of Public Economics, Vol. 45, No. 3, pp. 301–335, 1991) in which commuters choose their departure times from home and parking locations in a city with a bottleneck and parking spaces. We then show the properties of our model by analyzing equilibrium with and without flextime. The analysis reveals that parking congestion leads to temporal traffic dispersion when all firms adopt fixed work schedules, while it causes temporal traffic concentration when all firms adopt flexible work schedules. Furthermore, the bottleneck congestion is completely eliminated and the social optimum is achieved by assigning parking locations to commuters and introducing flextime.

DOI： 10.14954/jste.2.4_A_16

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

The present paper demonstrates that the bifurcation analysis method proposed by Akamatsu et al.¹⁵⁾ is readily applicable to the retail location model due to Harris & Wilson (1978)¹⁾. Employing 4-zone example, we analytically predict when and in which zone the agglomeration of retailers emerge. Our analysis also suggests that "spatial period doubling cascade" previously observed in some new economic geography models, proved in Ikeda et al.¹⁴⁾ and Akamatsu et al.¹⁵⁾, exists in Harris & Wilson model.

DOI： 10.2208/jscejipm.71.141

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Language：Japanese  

DOI： 10.2208/jscejipm.71.I_1027

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Language：Japanese   Publisher：交通工学研究会 ; [1966]-  

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jebo.2013.12.008

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

In the last two decades, a large number of studies have attempted to develop spatial computable general equilibrium (SCGE) models based on new economic geography (NEG). Although these studies provide SCGE models with agglomeration economies, their framework is oversimplified for computational purposes and inconsistent with NEG. This study develops an SCGE model consistent with NEG that has the following two characteristics to overcome the shortcomings of previous studies: 1) this model considers vertical linkages (input-output linkages) as in Venables¹⁾, which ensures the theoretical consistency; 2) the stable equilibrium that emerges after implementation of policies can be obtained. Furthermore, we present a numerical example to demonstrate that our model can be applied to practical applications.

DOI： 10.2208/jscejipm.70.245

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

In addition to free flow state and congested flow state, this study establishes the third phase of mixed flow state based on the q-k state using 5 minutes data, and carried out a comparative analysis, which investigates an impact of the three phases of traffic states on traffic accident risk. Firstly, in order to consider difference in the process of mixed flow state, this study analyzed the differences between the traffic accident risk on two-lane expressway and four-lane expressway. After, focused on an impact of a heterogeneous mixed flow state that appear when free flow state and congested flow state are mixed in space on accident risk, the relationship between the traffic states on each lane and traffic accident risk were analyzed. Using the accident record and the observed traffic data, this study analyzed the accident risk on the Hanshin Expressway network. As a result, it is shown that the accident risks of rear-ender collision and minor collision tend to be higher in the homogeneous congested flow comparing to ones in the heterogeneous mixed flow.

DOI： 10.2208/jscejipm.70.I_1127

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DOI： 10.2208/jscejipm.70.113

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Language：Japanese   Publisher：交通工学研究会  

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

In this paper, weinvestigate the effect of transport market structure on the distribution of economic activity. To achieve this purpose, we extend an economic geography model developed by Thisse⁸⁾ in order to incorporate the transport sector. Analysis of this model shows that if the carriers' entry is free, agglomeration of economic activity increases price competition among carriers that fosters further agglomeration. By contrast, if entry is regulated, the agglomeration increases the carriers' market power. Consequently, entry regulation in the transport sector may lead to the collapse of the agglomeration.

DOI： 10.2208/jscejipm.69.I_327

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DOI： 10.2208/jscejipm.69.250

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

Numerous studies in the field of spatial economics have been devoted to explain mechanisms of the spatial agglomeration of economic activities. These studies have the potential to provide a basis for predicting and evaluating long-term effects of various economic policy proposals. However, there remain some fundamental problems for applying these studies to such applications, which result directly from technical difficulties caused by the non-convexity of spatial agglomeration models. In this paper, we first summarize issues of spatial economics and then review our studies that attempt to overcome these issues. Finally, we discuss future studies.

DOI： 10.2208/jscejipm.69.I_31

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DOI： 10.2208/jscejipm.69.53

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

This study makes verification analysis of a ramp metering control strategy using Macroscopic Funda-mental Diagram. One of the greatest advantages of the control is that the control can be operated without OD information. In this analysis, the driver's route choice behavior model is constructed, in which they choose their route, expressway or arterial. Then, applying a simulation model with the route choice model to an actual expressway network and an actual OD demand, the analysis has been done. The results show that operation of the control has benefits to improve the traffic states on expressway and to increase in-flow traffic. In other words, it is shown that the traffic flows not only on expressway but also on arterial could be improved by operating the proposed metering control.

DOI： 10.2208/jscejipm.69.I_579

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jedc.2012.04.010

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

This paper analyzes the traffic accident risk in urban expressway focusing on the traffic state and the number of road lanes. In the previous studies, regression analyses have been done to a two lane urban expressway. Then, the various factors, such as traffic flow state, road geometry and environment, have significant impacts on the occurrence of the 3 types of accident, rear-ender collision, minor collision and own-crash accident. In this study, using the accident report, traffic counts obtained by detectors, rain precipitation data and road geometry data on Hanshin Expressway during 3 years from 2006 to 2008, the differences between the traffic accident risk on two-lane expressway and multi-lane expressway are investigated. As a result, it is shown that the traffic accident risk on multi-lane expressway is higher than that of two-lane expressway, and the impacts of each factor on the risk are different between the two types of expressways.

DOI： 10.2208/jscejipm.68.I_1349

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DOI： 10.2208/jscejd.66.442

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejd.66.232

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DOI： 10.2208/jscejd.65.39

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