Hidenori Tamagawa

A study on the relations between criminal behaviors in purse-snatching and urban spaces

Many purse-snatching cases occur near or around stations or entertainment areas where many people gather. We examined 16 purse-snatching cases closely and verified how purse-snatching offenders utilized urban spaces and how they behaved. Our results showed that purse-snatching offenders headed for hunting grounds looking for their targets based on the distance between their bases and their hunting grounds. It also depended on the transportation means they used. Urban elements also affected the behaviors of the purse-snatching offenders and the offenders often utilized urban structures such as parks as their escape routes or hiding places.

The Implications of Using a Gravity Model to Determine Territory in a Circular Domain

This paper uses a gravity model to determinate the territory of two facilities on a two-dimensional plane and aims to discover its new implications. The recursive process is installed to the model in such a way that the future scale of a facility reflects the present amount of territory. And the facilities can be located in a two-dimensional circular domain so that the hinterland effect is incorporated. As a result, firstly, an ordinary tendency—the so-called weak-to-the-wall phenomenon—is observed. The smaller the distance-decay parameter, the more frequently this monopolization occurs. On the other hand, peculiar variations in the models behavior are also found with changes in parameter values. A reversal of the facility scale, the coexistence of two facilities even with a small distance-decay parameter, and other novel phenomena also occur with some cases of facility locations and initial scale conditions.

The characteristics of rail freight transportation and provincial factors in China

In todays developing countries, especially China and India, populations are growing and levels of energy consumption are rapidly increasing as economies develop. Therefore, the problem of procuring energy for transportation is a major global challenge in the twenty-first century – particularly in China. Using the established regression model of transportation energy, we analyze the relationship between the distribution of cities and the level of rail freight transportation energy consumption in China. For a long time, studies on freight transportation in China have used qualitative analysis as the core analysis method and there has been less quantitative research. So the purpose of this study is to analyze the relationship between the distribution of cities and rail freight transportation using quantitative research. The conclusions of this paper are as follows: first, this study reveals the primary factors that have an influence on rail freight transportation using the multiple-regression model. We can see that factors such as the degree of industrial development and coal-related industries have a significant impact on the level of rail freight transportation energy consumption. Second, through analysis of the independency of cities in China we found that China has significant regional disparities and that it is still quite difficult to set up independent urban regions in China.