In new economic geography, economic agglomeration is known to be governed by bifurcation. However, the majority of theoretical researches focuses on two-place economy and racetrack economy and abstract from geographical advantage which are pervasive in the real world. In this paper, we focus on a long narrow economy, in which discrete locations are equally spread over a line segment. By group-theoretic bifurcation theory, we elucidate the bifurcation mechanism of monocentric city on this economy analytically. Emergence of satellite cities around a primary city is shown to be exist. By numerical analysis of Forslid & Ottaviano model with replicator dynamics, we show that the higher the expenditure share of manufactured goods is or the lower the elasticity of substitution is, the farther from the monocentric city satellite cities emerge.
This study assumes that there is aggregate heterogeneity of the local menus (goods) produced in different regions, and the households have preference for the variety of local menus. Then, this study analyzes the structure of urban system composed of two regions. In order to conduct the analysis, this study introduces the households’ preference for the variety of local menus into the Core-Periphery model of Krugman. Then, this study analyzes the effect of reduction in transportation cost between the regions on the population distribution across the regions. Through the analysis, this study shows that the reduction in transportation cost between the regions can promote the population dispersion across the regions if the households’ preference for the variety of local menus is sufficiently strong. In addition, this study shows that reinforcement of households’ preference for the variety of local menus also promote the population dispersion across the regions.
Migration caused by an external force such as a natural disaster and war can make a sustained city slip into decline. This paper defines Absorptive capacity as the ability of an urban system to tolerate the emigration generated by an external force and recover its previous condition. The paper establishes a two-city small open model based on New Economic Geography to show the following characteristics of urban systems’ Absorptive capacities. First, the high freeness of trade leads to an enhancement of both cities’ Absorptive capacities. Second, the high convenience of inner-city traffic in one city increases not only the city’s Absorptive capacity but also the other city’s capacity. Finally, the high productivity of industry in one city results in an improvement of the city’s Absorptive capacity but causes a reduction of the other city’s capacity.
In this research, we microscopically analyzed the vehicle starting characteristics based on the with or without of the remaining time indication until the traffic signal turns to green under the observation surveys at real intersections and the driving experiments on virtual roads. We also tried nine remaining time indication designs and considered the optimum design that can promote vehicles starting safety and smoothly. Since it becomes easy to understand the timing of starting and possible to adjust the acceleration and deceleration at the time of starting by indicating the remaining time, the startup delay and significant premature start decreased. The remaining time indication designs by numbers are useful for not only leaving vehicles but also following vehicles to start faster.
This study compares and analyzes characteristics of political measures toward the optimal deployment for large logistics centers in Tokyo Metropolitan Area (TMA), such as the government’s advisory committee’s findings, the development plans, project methods, regulation and incentive methods for large logistics centers, and the actual trends in location of those. Then, it aims at identifying the needs of political measures for large logistics centers and future direction of measures for large logistics centers in coastal areas (in TMA). As a result, it found that large logistics centers have been located almost as they were intended in the development plans in consequence of political measures throughout the high-growth era, stable growth era, Heisei era (1989-2019), respectively, so the measures seemed essential. It also found that as to the future direction of political measures, project method, and regulation and incentive method for large logistics centers, coordination between metropolitan planning and urban planning for redevelopment of aged logistic facilities in Coastal Area, application of an alternate project method to the Act on the Improvement of Urban Distribution Centers, application of an alternate regulation and incentive method to the Act on Advancement of Integration and Streamlining of Distribution Business are necessary.
In the depopulation area according to the declining birth rate and aging population, the road has an important role in the transport system that supports daily life. The effective and efficient improvements of road network are required. This study proposes an evaluation method by which we can easily understand and analyse characteristics of road networks compared with the conventional evaluation methods. The purpose of this study is to understand the functional and spatial characteristics of the road networks and to provide useful suggestions for the improvement policy according to the locations and roles. Specifically, the eigenvector centrality measures weighted by seven traffic indicators reveal the characteristics of the road network. The eigenvector centrality measure is one of the network topological indicators. Furthermore, the common factors on the characteristics of road networks are extracted, and the necessary road improvement plans are discussed from the results of the hierarchical clustering by the influence magnitudes on the common factors.