JaLCDOI 10.18926/fest/11610
フルテキストURL 001_047_053.pdf
著者 佐々木 徹| 石川 洋文| 梶原 毅| 渡辺 雅二|
抄録 We treat the problem of water pollution by the method of a mathematical model. We illustrate the method of analysis with Kojima Lake. We analyze in-flow and out-flow of the lake, compute numerical solutions of the governing equations of the water flow and the pollutant. The simulation leads to the conclusion concerning the figure of Kojima Lake.
キーワード Kojima lake Water analysis Finite element method
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1996-03
1巻
1号
開始ページ 47
終了ページ 53
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313787
JaLCDOI 10.18926/fest/11560
フルテキストURL 003_031_036.pdf
著者 佐々木 徹| 梶原 毅| 石川 洋文|
抄録 We have computed the phase of spreading contaminations in Kojima Lake by using the upwind-type finite element method. We have treated the two cases: the pollutant flows from the Sasagase river and from the Kurashiki River. We see that the upwind-type finite element method is effective in both cases, when the diffusion constant is quite small.
キーワード Upwind-type Finite element method Kojima Lake
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1998-01-14
3巻
1号
開始ページ 31
終了ページ 36
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313715
JaLCDOI 10.18926/fest/11557
タイトル(別表記) Mathematical analysis of virus infectious diseases by ordinary differential equations
フルテキストURL 005_023_030.pdf
著者 佐々木 徹| 梶原 毅|
抄録 Some mathematical models describing interaction of virus and cells in vivo are reviewed. Similar models using systems of ordinary differential equations can be used for the analysis of dynamics of virus and cells for different kinds of virus. Models for human immunodeficiency virus, hepatitis C virus and hepatitis B virus are treated here. Although models are similar, different approximations can reduce the systems to the explicitly solvable forms. The solutions obtained here can be used to estimate biological parameters.
キーワード Virus Mathematica models HIV HCV HBV
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2000-02-29
5巻
1号
開始ページ 23
終了ページ 30
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313498
JaLCDOI 10.18926/fest/11555
タイトル(別表記) Simulations of Heel Impact by Viscoelastic Models
フルテキストURL 005_013_021.pdf
著者 小久保 雅仁| 佐々木 徹|
抄録 The purpose of this study is to make some body models with viscoelastic model, to simulate the heel impact and to obtain the ground reaction force. In this paper, we build up body models of linear viscoelastic elements and mass elements to simulate heel impact. Here we consider the systems of linear differential equations numerically for the preparation of mathematical analysis in future. The simplest model with two mass elements is hardly able to simulate the heel impact if the rate of mass of elements is realistic. The models with more elements are suitable to simulate for actual rate of weight of body segments. The model with three mass elements makes it possible to guess the force to each body segment.
キーワード Running Heel Impact Viscoelastic Model Biomechanics
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2000-02-29
5巻
1号
開始ページ 13
終了ページ 21
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313531
JaLCDOI 10.18926/fest/11553
タイトル(別表記) Mathematical analysis of pathogenesis of viral hepatitis.
フルテキストURL 005_007_011.pdf
著者 佐々木 徹| 梶原 毅|
抄録 Simple mathematical models are considered to explain the pathogenesis of viral hepatitis. Dynamics of populations of liver cells and two virus strains are analyzed qualitatively. This analysis suggests the possibility that the viral mutation causes the hepatitis from the state of carrier.
キーワード hepatitis mathematical model mutation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2000-02-29
5巻
1号
開始ページ 7
終了ページ 11
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313400
JaLCDOI 10.18926/fest/11527
タイトル(別表記) Random Bit Strings and Antigenic Diversity ― Simulations
フルテキストURL 006_035_039.pdf
著者 佐々木 徹|
抄録 Transition of random bit strings is simulated by using pseudorandom numbers. Bit strings are considered as RNA of HIV virus here. Transition of random bit strings represents that of antigenic deversity.
キーワード random bit string simulation of errors in RNA transcription antigenic diversity
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 35
終了ページ 39
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313453
JaLCDOI 10.18926/fest/11515
タイトル(別表記) Stability analysis of mathematical models of infectious disease
フルテキストURL 007_017_021.pdf
著者 村瀬 晶子| 佐々木 徹| 梶原 毅|
抄録 Dynamics of infectious disease in vivo is described by coupled differential equations. Stability analysis of the complicated systems is difficult without computer calculation, while stability analysis is, in general, important to investigate qualitative behaviour of models. Liu analyzes stability of systems describing HIV dynamics in vivo with a symbolic calculation software. The same method is used for stability analysis of a mathematical model of malaria.
キーワード mathematical model infectious disease dynamics in vivo stability analysis symbolic calculation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 17
終了ページ 21
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313783
JaLCDOI 10.18926/fest/11483
タイトル(別表記) On Persistence in Dynamical Systems (Review)
フルテキストURL 010_013_021.pdf
著者 佐々木 徹| 梶原 毅|
抄録 Some important results on persistence are reviewed. These results concern the behavior of the orbits approaching the boundary. The orbits restrict the flow on the boundary, if one of them approaches more than one invariant set. A typical example is a model for cyclic competition, where the heteroclinic cycle can be the ω-limit set. Thus the persistence can be reduced to some conditions on the boundary flow.
キーワード persistence ordinary differential equation dynamical system
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2005-02-28
10巻
1号
開始ページ 13
終了ページ 21
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313932
JaLCDOI 10.18926/fest/11481
フルテキストURL 010_009_011.pdf
著者 梶原 毅| 佐々木 徹|
抄録 An elementary proof of permanence for a simple mathematical model proposed by Nowak and Bangham. In many papers, permanence property is proved by theorems established by the general theory of dynamical system. In this paper, we present an elementary proof only using differential inequalities and the theory of linear differential equations with constant coefficients.
キーワード Permanence dynamical system pathogen
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2005-02-28
10巻
1号
開始ページ 9
終了ページ 11
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313596