Social Simulation and Grid Computing

第173回産業セミナ

Application of Grid Computing for Policy-Making Assistance

第175回公開講

Computer-Aided Policy Design Support System

第182回公開講

Simultaneous quasi-periodic optical and HF radar signatures observed in the postnoon sector

Zhongshan Station in Antarctica is located close to the polar cusp/cleft latitude. The field of view of the Syowa East HF radar also covers Zhongshan Station. Simultaneous quasi-periodic phenomena of optical aurora, HF radar backscatter power and Doppler velocity, and ground based magnetograms were observed in the magnetic postnoon sector (～330 MLT to 1510 MLT) on 3 August 1997. The characteristics of the quasi-periodic event are summarized in the following; 1) East-west aligned band/arc type discrete aurora showed quasi-periodic luminosity variations with period of -6-10 min, 2) Quasi-periodic variations of the optical aurora had one to one correspondence with the variations of HF radar backscatter powers and magnetic pulsations, 3) The HF backscatter region was located at the lower latitude of the quasi-periodic optical aurora, 4) Quasi-periodic variations of line-of-site Doppler velocity detected by HF radar showed very close relation to the magnetic pulsations observed at Zhongshan in Antarctica and the IMAGE magnetometer array in the northern hemisphere, 5) The IMAGE data revealed that the region of quasi-periodic HF radar backscatter (irregularities) corresponds to the region of intensity maximum of magnetic pulsations

Policy Grid Computing Experiment on the Labor Supply of Married Women

本研究では、第1にエージェント間相互影響モデルを既婚女性の就業行動に適用した労働市場の分析手法を提案する。第2に、分析手法によるシミュレーション結果の政策的含意を考察する。第3に、大容量データの処理を可能にするために、商用プロバイダ経由グリッドシステムとスーパーSINET経由グリッドシステムの性能比較を行う。その結果、託児所を居住地に隣接して設置するよりも職場に隣接して設置する方が既婚女性の就業意欲が増加することが分かった。さらに、計算時間は両グリッドシステムともに6分1短縮した

Institutional Design of Public Pension Systems Based on Social Simulation

本稿では、少子高齢化に対応した公的年金制度の財政方式として世代別積立方式を提案し、負担給付比率と国庫負担をシミュレートすることによって世代別積立方式の世代間公平性および財政的持続可能性を明らかにする。次に現行方式から世代別積立方式への移行方法について複数のシナリオを設定し、公的年金制度の財政方式の移行も含めて必要な国庫負担をシミュレートする。最後に、世代別積立方式を適用した場合の年金額の算定方法を提案し、年金所得のジニ係数をシミュレートすることによって世代内公平性について検討する。　In this paper, we propose a generation-based funding scheme as a fiscal scheme of public pension systems for an aging society and simulate contribution-benefit ratio and government contribution for showing intergenerational equity and fiscal sustainability. We simulate government contribution for transferring to generation-based funding scheme from the current fiscal scheme of a pay-as-you-go scheme. We propose a method to calculate pension in the generation-based funding scheme and simulate Gini coefficient for verifyingthe intra-generational equity.第173回産業セミナ

Genetic network programming with automatically defined groups for assigning proper roles to multiple agents

In this paper, we apply a Genetic Network Programming (GNP) Architecture using Automatically Defined Groups (ADG) to a multi-agent problem where cooperation of agents are required. GNP is a kind of evolutionary methods inspired from Genetic Programming (GP). While GP has a tree architecture, GNP has a network architecture with which an agent works in the virtual world. In GNP with ADG, each agent is assigned to a group according to its role to complete some task of a cooperative problem. We consider two types of problems in this paper: one problem is to assign an appropriate role to each agent according to its ability, and the other is to assign a proper role to each agent with the same ability. While the first problem has the specific conditions as for the ability of an agent, the latter is a general problem. We show the effectiveness of GNP with ADG through computer simulations on the two types of load transportation problems