Statistical Analysis of the Metropolitan Seoul Subway System: Network Structure and Passenger Flows

The Metropolitan Seoul Subway system, consisting of 380 stations, provides the major transportation mode in the metropolitan Seoul area. Focusing on the network structure, we analyze statistical properties and topological consequences of the subway system. We further study the passenger flows on the system, and find that the flow weight distribution exhibits a power-law behavior. In addition, the degree distribution of the spanning tree of the flows also follows a power law.Comment: 10 pages, 4 figure

Coarsening Dynamics of an Antiferromagnetic XY model on the Kagome Lattice: Breakdown of the Critical Dynamic Scaling

We find a breakdown of the critical dynamic scaling in the coarsening dynamics of an antiferromagnetic {\em XY} model on the kagome lattice when the system is quenched from disordered states into the Kosterlitz-Thouless ({\em KT}) phases at low temperatures. There exist multiple growing length scales: the length scales of the average separation between fractional vortices are found to be {\em not} proportional to the length scales of the quasi-ordered domains. They are instead related through a nontrivial power-law relation. The length scale of the quasi-ordered domains (as determined from optimal collapse of the correlation functions for the order parameter $\exp[3 i \theta (r)]$) does not follow a simple power law growth but exhibits an anomalous growth with time-dependent effective growth exponent. The breakdown of the critical dynamic scaling is accompanied by unusual relaxation dynamics in the decay of fractional ($3\theta$) vortices, where the decay of the vortex numbers is characterized by an exponential function of logarithmic powers in time.Comment: 13 pages, 26 figure

Football in North and South Korea c.1910-2002: Diffusion and Development

Politics has been an integral part of Korean football since the Japanese colonial era when the game became a vehicle for the Korean independence movement. The split between North and South Korea following the Korean War further accentuated the intrusion of politics into the domain of Korean football. As Koreans residing on either side of the border followed the game with intense interest and often regarded performance in international competition as a signifier of national prestige, the governments of both North and South Korea attached more importance to football than to any other sport and became its foremost patrons. In these circumstances it is not surprising to find that the relative performance of the national teams of North and South Korea mirrored changing economic and political conditions. Thus the rapid rise of North Korean football in the 1960s was a reflection of the state’s systematic and successful postwar reconstruction. Since the 1980s, however, South Korea, with its booming economy, has clearly surpassed its increasingly impoverished northern counterparts in the football field. Undoubtedly, the most two important events pertaining to the development of Korean football were the 1966 and 2002 World Cups. They provided occasions when nationalist sentiment could be expressed through football in both North and South Korea. They also provided opportunities for Korean footballers, through their achievements on the field, to show that the gap between the traditional periphery and core of world football was narrowing. At the same time, participation in competition at this level, whether by teams from North or South Korea, suggested that there was a recognizable and distinctive Korean football style nurtured in training camps where the emphasis was on producing players with sufficient stamina to run at their opponents for ninety minutes. Tireless running football has been the characteristic of successful teams from both North and South Korea. Thus, while recognizing the profound ideological differences that separate North and South Korea, this thesis also emphasizes the football tradition and culture that ethnically homogenous Koreans have in common