Research Projects -

Study on temporal and spatial patterns of influenza epidemics

Grant-in-Aid for Scientific Research (C)

Project Year :

2008

-

2010

 

SUMI Ayako, KAMO Kenichi, KOBAYASHI Nobumichi

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We obtained the following two main results : (i) Time series analysis for incidence data of influenza revealed that the amount of amplitude of the interepidemic periods increased during the occurrence of influenza pandemics and decreased when vaccine programs were introduced. The finding suggests that the temporal behavior of the interepidemic periods of influenza epidemics is correlated with the magnitude of cross-reactive immune responses. (ii)Based on the result of time series analysis, we successfully predicted the incidence of influenza quantitatively.

Economic analysis of natural disturbance and management abandonment risk for sustainable forest resource management

Grant-in-Aid for Scientific Research (A)

Project Year :

2007

-

2010

 

YOSHIMOTO Atsushi, SHOUJI Isao, YANAGIHARA Hirokazu, ISHIKAWA Hitoshi, KAMO KenーIchi

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The effective utilization of timber is important for sustainable use and management of forest resources. However, recent flagging timber prices as well as damages by natural disturbances such as typhoon have accelerated the abandonment of forest management such as thinning and planting which in turn is threatening the sustainable use of forest resources. Projecting the risk of natural disturbance damages and forest management abandonment will provide important information for conducting sustainable forest management. In this study, through an interdisciplinary approach, we conducted a wind tunnel simulation, statistical modeling, inter-temporal spatial optimization modeling, and with use of geographic information system (GIS), we examined the risk hedge sustainable resource management that could stimulate mitigation of the risk of natural disturbance and management abandonment.

がんの実態把握とがん情報の発信に関する研究

Project Year :

2006.04

-

2013.03

 

祖父江友孝, 柴田亜希子, 服部昌和, 伊藤秀美, 杉山裕美, 大木いずみ, 三上春夫, 岡本直幸, 片山佳代子, 西野善一, 早田みどり, 安田誠史, 加茂憲一, 松田智大, 片野田耕太, 雑賀公美子, 西本寛, 東尚弘, 松田彩子

The research for the method analyzing the data of cancer incidence and mortality

Grant-in-Aid for Young Scientists (B)

Project Year :

2006

-

2008

 

KAMO Ken-ichi

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本研究では,がん罹患・死亡データから特に全国規模のデータに着目し,それを解析するための手法の開発を行った.ロジスティック回帰モデルとモデル選択規準量を用いて,全国罹患数推計に関して,登録の完全性を補正する方法を構築し, 現在の報告値が20〜30%ほどの過小評価である可能性を指摘した.また,生命表の考え方を用いて,がん罹患・死亡生涯リスク確率を推定し,男性の2人に1人が,女性の3人に1人ががんに罹患するという結果を得た.

Asymptotic Analysis of nonlinear ordinary differential equations and its applications

Grant-in-Aid for Scientific Research (C)

Project Year :

2005

-

2008

 

USAMI Hiroyuki, NAITO Manabu, TANIGAWA Tomoyuki, KAMO Ken-ichi, TERAMOTO Tomomitsu

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実領域上での非線型常微分方程式の漸近理論について研究成果を上げることができた. 例えば, 準線型2階方程式の正値解の漸近形を導出できた. また, 高階常微分方程式の解の振動性の特徴付けや解の零点の分布状況を調べた. 応用として, 比較定理等を用いて楕円型偏微分方程式の種々の漸近的性質を持つ解の存在証明や解の振動性の特徴付け等ができた.

微分方程式論

統計データ解析