Starting with Tokaido Shinkansen in 1964, there have been already 92 Shinkansen stations nationwide. However, these Shinkansen stations may not always be built accessible. In this research, we analyzed the relationship between the accessibility of the Shinkansen station and the change of statistical data including population, economics, industry, and land use of the local municipalities where the Shinkansen stations are currently located. We collected many socioeconomic statistics from various sources of cities and towns with 69 Shinkansen stations. We developed structural equation model showing relationship among statistical data. It is found that Shinkansen station with high accessibility can reduce regional decline compared to those with low accessibility.
Benefit evaluation for transport projects has been energetically conducted by applying the SCGE model. In most those researches, transport firm producing transport services has not existed explicitly, so the required transport time reduction occurred by transport projects is assumed to be effective for transport service consumers directly. However, those assumption have three main problems that 1) the effects improved productive efficiency and changes of value added cannot evaluate, 2) the model outputs unreasonable results changing transport costs in proportion to price change of transported goods and 3) spillover effects of changing commodities’ price or wage do not influence to transport production. In this paper, we developed the SCGE model introduced the behavior producing transport services by transport firm. We created the Benefit Incidence Table to confirm spillover effects and indicated consistency to benefit evaluation methods of the Manual of Cost Benefit Analysis in Japan.
The paper proposes a weighted optimal classification tree (WOCT) to classify condition ratings of public facilities. We can distinguish and avoid the fatal error, such as buildings in ‘bad’ condition are classified as ‘good’ condition, in WOCT. Furthermore, the deterioration survey was conducted on 32 public facilities in Matsuyama City, Ehime Prefecture. And we applied our method and found that it is possible to construct an optimal classification tree for careful judging of condition rating so as to avoid fatal misclassification without degrading the accuracy of the classification tree.
An emergency repair system for partially destroyed houses is effective for closing evacuation centers proactively and reducing the demand for temporary housing and public housing following a disaster. However, there are many problems associated with the system in past disaster. In this study, usage of the emergency repair system and issues pertaining to use the system in Mashiki following the 2016 Kumamoto earthquake were investigated. We examined the actual condition of their repair method choice and usage of the emergency repair system using a mail-based survey data conducted by Mashiki’s local government in July 2017. We also conducted an interview survey from November to December 2017 of 20 households whose houses were partially damaged by the earthquake and had lived in temporary housing. Using interview data, we demonstrate their decision-making process after the disaster as well as their attitude in requesting the support system.
For the geometric design of a roundabout, a safety-oriented approach is required rather than a simple specification dependent design that normatively determines dimensions of the geometric elements. However, such a safety performance index or evaluation methodology has yet to be included in the Japanese guidelines. In this study, we propose a risk index (RI) that combines the mislook probability and crash impact as a performance index for evaluating the safety of roundabout geometric designs; a method to calculate this index is also described. Then, a model equation to calculate the RI from the geometric conditions throughout the numerical simulation is presented. Finally, it is demonstrated that the mislook probability is greater when the entry angle is lower, and the crash impact increases when the deviation angle decreases.
In recent years, the “compact city” concept is gaining popularity as a suitable urban structure for a depopulation society in Japan. Therefore, some local governments have proposed the compact city concept in their urban planning. In such plans, the population density of compact area is set as a target value in order to sustain the services and communities. However, it is not clear how much population density can keep them. Consequently, this study aims to clarify the relationship between the existence of various facilities and population density as basic information for designing a compact city plan. As a result, 25 facilities have strong relationship with population density and the tendency of facility locations can be classified into three groups according to population density level. In addition, many facilities tend to be in the area where the population density is about 60 persons/ha.