Study on the Classification of Networks and Connection Density

Abstract

One of the widely used keywords in modern-day society is "network." Information communication networks, e.g., communication and broadcasting networks, networks of different industries across the framework of an organization, community networks of citizens, and networks of nonprofit organizations, are rapidly enhancing in various fields of social "networking." Finally, based on this trend, several researchers have focused on "network" and conducting studies in individual research fields related to social science and engineering (natural science). Several network studies have been conducted by segregating the research into social science and natural sciences. However, a few major issues remain unresolved in network studies.This study clarifies the definition and positioning of networks and networking using an interdisciplinary approach from social science (organizational theory) and engineering (graph theory). Moreover, we will focus on network connectivity and propose connection density indicators. Based on an empirical analysis, the connection density of Japanese subways will be calculated using this connection density index, and the connectivity of each subway will be examined.