Cooperative Physics of Fly Swarms: An Emergent Behavior

We have simulated the behavior of several artificial flies, interacting visually with each other. Each fly is described by a simple tracking system (Poggio and Reichardt, 1973; Land and Collett, 1974) which summarizes behavioral experiments in which individual flies fixate a target. Our main finding is that the interaction of theses implemodules gives rise to a variety of relatively complex behaviors. In particular, we observe a swarm-like behavior of a group of many artificial flies for certain reasonable ranges of our tracking system parameters.

Suppliers' Associations in the Japanese Automobile Industry

This paper analyzes the structure and functions of suppliers' associations (kyoryokukai) in the automobile industry in Japan. The bilateral assembler-supplier relationship has received much attention recently as a source of Japanese industrial competitiveness. However, this paper argues that the hitherto neglected area of inter-supplier coordination in technology diffusion is at least as important as the bilateral assembler-supplier relationship in accounting for the overall performance of the Japanese automotive industry. On the basis of company visits and a largescale survey of first-tier suppliers conducted by the author, the paper analyzes the reasons why suppliers' associations were established, why they continue to exist today, and their effects on economic performance.