Current models used in our laboratory to assess the migration and traction of a population of cells within biopolymer gels are extended to investigate temporal changes in these parameters during compaction of mechanically constrained gels. The random cell migration coefficient, micro (t) is calculated using a windowing technique by regressing the mean-squared displacement of cells tracked at hi...

Although overcrowded and the depopulation of the population are one of the social issues in Japan, the complex mechanisms are not comprehended. Then, we tried to show this phenomenon by catching as a network. We interpreted prefectures as nodes and migration as links. We observe power law distribution in both population and migration. We insist on the necessity of reconsider the prevailing assu...

International migration will play an increasing role in the demographic future of most nations if fertility continues to decline globally. We developed an algorithm to project future numbers of international migrants from any country or region to any other. The proposed generalized linear model (GLM) used geographic and demographic independent variables only (the population and area of origins ...

This article reviews the role of migration in determining population size in Australia, and suggest ways of achieving a stationary population, or zero population growth (ZPG), when fertility is below replacement. There is a narrow range of feasible options. It is argued that achievement of ZPG is feasible only with net migration of 60,000-100,000 annually and with a fertility rate of 1.65-1.8...

human settlements experience continual change. in recent years, many rural areas have experienced dispersed grow (rural sprawl) and population declines in traditional village centers (hollowing). these paradoxical phenomena have occurred in most developing countries, including rural iran. this study examines this phenomena in three iranian villages of kahak area of qom province, and develops a ...

Biogeography-based optimization (BBO) is a population-based evolutionary algorithm (EA) that is based on the mathematics of biogeography. Biogeography is the study of the geographical distribution of biological organisms. In BBO, problem solutions are represented as islands, and the sharing of features between solutions is represented as migration. BBO is similar to a genetic algorithm with glo...

In this paper we investigate the design of highly parallel Genetic Algorithms. The Traveling Salesman Problem is used as a case study to evaluate and compare diierent implementations. To x the various parameters of Genetic Algorithms to the case study considered, the Holland sequential Genetic Algorithm, which adopts diierent population replacement methods and crossover operators, has been impl...

This paper presents a new learning algorithm, Multi-Population Cooperative Particle Swarm Optimizer (MCPSO), for neural network training. MCPSO is based on a master-slave model, in which a population consists of a master group and several slave groups. The slave groups execute a single PSO or its variants independently to maintain the diversity of particles, while the master group evolves based...

In this paper we investigate the design of highly parallel Genetic Algorithms. The Traveling Salesman Problem is used as a case study to evaluate and compare di erent implementations. To x the various parameters of Genetic Algorithms to the case study considered, the Holland sequential Genetic Algorithm, which adopts di erent population replacement methods and crossover operators, has been impl...