検索結果 2723 件
| JaLCDOI | 10.18926/fest/11612 |
|---|---|
| フルテキストURL | 002_107_120.pdf |
| 著者 | 藤井 弘章| Ofori Emmanuel| 島田 清| 西村 伸一| |
| 抄録 | This paper discusses a numerical model that can be used to optimize the installation in a zoned type and a homogeneous type fill dam. Before installation in a real dam to evaluate dam behavior, numerical model described in this paper is carried out on a prototype dam to check the optimum installation, using cross arm measurements. Three cross arm installations at the upstream, the core and downstream to measure displacements are considered. The installation options considered are three cross arm combinations for best installation to verify the safety of dams and to reduce cost. Finite element method is used for generating the displecement field in a linear elastic numerical model. The generated data is used as an input data in the back analysis to check the adequacy of each installation option. |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 1997-01-10 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 107 |
| 終了ページ | 120 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313925 |
| JaLCDOI | 10.18926/fest/11611 |
|---|---|
| フルテキストURL | 001_065_076.pdf |
| 著者 | 金 鉉彬| 田中 豊| |
| 抄録 | Partial least squares linear discriminant function (PLSD) as well as ordinary linear discriminant function (LDF) are used in pattern recognition analysis of writer identification based on are patterns extracted from the writings written with Hangul letters by 20 Koreans. Also a simulation study is performed using the Monte Carlo method to compare the performances of PLSD and LDF. PLSD showed remarkably better performance than LDF in the Monte Calro study and slightly better performance in the analysis of the real pattern recognition data. |
| キーワード | Writer identification Arc patterns Linear discriminant function Partial least squares |
| 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 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 65 |
| 終了ページ | 76 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002314147 |
| 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 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 47 |
| 終了ページ | 53 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313787 |
| JaLCDOI | 10.18926/fest/11606 |
|---|---|
| フルテキストURL | 001_027_041.pdf |
| 著者 | 石川 洋文| |
| 抄録 | The author has proved the dimension formula of the space of the Hilbert modular type cusp forms of weight two. We present further refinements of the dimension formula for a real quadratic number field Q(√D), and calculate it effectively. We tabulate the dimensions for square-free natural numbers D below 104 with the computer assistance. We also determine all the spaces of their dimension below 10. |
| 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 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 27 |
| 終了ページ | 41 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313526 |
| JaLCDOI | 10.18926/fest/11604 |
|---|---|
| フルテキストURL | 001_021_026.pdf |
| 著者 | 洞 彰人| |
| 抄録 | Let G be a topological group acting on S transitively from the left with a compact stabilizer K. We show that every isotropic (i.e. spatially homogeneous w.r.t. the G-actions) Markov chain on S can be lifted to a right random walk on G and give a one-to-one correspondence between the isotropic Markov chains on S and the totality of sequences of probabilities (ν,μ1,μ2,･･･) where ν is a probability on G/K and each μn is that on K＼G/K. |
| キーワード | random walk Markov chain |
| 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 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 21 |
| 終了ページ | 26 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313549 |
| JaLCDOI | 10.18926/fest/11601 |
|---|---|
| フルテキストURL | 001_001_013.pdf |
| 著者 | 森本 雅治| 柳原 守| |
| 抄録 | In transformation groups on manifolds, it has been an interesting problem to ask whether for a given finite group G, there exists a real G-module V such that dim VP >2dimV>P for all subgroups P of prime power order and such that VH=0 for certain large subgroups H of G. This paper provides GAP programs to show that S5 does not admit such a real S5-module V. |
| キーワード | GAP fixed point gap condition |
| 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 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 13 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313410 |
| JaLCDOI | 10.18926/fest/11595 |
|---|---|
| フルテキストURL | 002_009_017.pdf |
| 著者 | 石川 洋文| |
| 抄録 | In this paper, we have calculated the elliptic singularities of the symmetric Hilbert modular group defined over a real quadratic number field. Applying those to the dimension formula, we tabulate the dimensions of the space of symmetric Hilbert modular forms of weight two satisfying certain cusp condition. |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 1997-01-10 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 9 |
| 終了ページ | 17 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313960 |
| JaLCDOI | 10.18926/fest/11593 |
|---|---|
| フルテキストURL | 002_001_008.pdf |
| 著者 | 洞 彰人| |
| 抄録 | An aspect of the cut-off phenomenon is reviewed. It is a sort of critical phenomenon observed in a wide variety of diffusion. We introduce a framework in which such a phenomenon can be understood and analyzed in a rigorous manner. We illustrate the mechanism with some concrete models. |
| キーワード | cut-off phenomenon critical time diffusion Markov chain on a graph symmetry |
| 出版物タイトル | 岡山大学環境理工学部研究報告 |
| 発行日 | 1997-01-10 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 8 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313764 |
| JaLCDOI | 10.18926/fest/11591 |
|---|---|
| タイトル（別表記） | Evaluation of Liquefaction Resistance by In-situ Testing and Its Application to Reliability Design |
| フルテキストURL | 005_145_151.pdf |
| 著者 | 西村 伸一| 清水 英良| 藤井 弘章| 島田 清| |
| 抄録 | A calculation method of probability of liquefaction is proposed in this paper. The spatial variability of soil parameters for the dynamic shear strength, i.e., N-values, median grain size, fines contents, and the statistical characteristics of the earthquake frequency are considered in the analysis. The standard penetration test (SPT) is convenient to estimate the spatial variability of the dynamic shear strength and mainly used in this study. Furthermore the determination of dynamic shear strength based on Swedish weight Sounding test also introduced here, because it is the simpler test than SPT. While the statistical model of the earthquake frequency is determined based on the record of historical earthquakes. Using this method the probability of liquefaction is calculated. The sand compaction pile method is considered for the ground improvement against the liquefaction. Finally, the relationship between the sand replacement rate and the probability of liquefaction is clarified. |
| キーワード | probability of liquefaction reliability design spatial variability of soil parameters statistical model of earthquake frequency dynamic shear strength |
| 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 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 145 |
| 終了ページ | 151 |
| ISSN | 1341-9099 |
| 言語 | 日本語 |
| 論文のバージョン | publisher |
| NAID | 120002314022 |
| JaLCDOI | 10.18926/fest/11581 |
|---|---|
| フルテキストURL | 005_113_119.pdf |
| 著者 | Xie Guanmo| 谷口 健男| Chouw Nawawi| |
| 抄録 | Near source earthquakes can produce strong vertical ground motions with large amplitude and high frequency content. In this paper the axial ductility behavior of RC columns due to near source earthquakes is investigated. The column is simplified to a SDOF system that only describes vertical vibrations of a structural column. The gravity load effect is represented by a pre-load. An elasto-plastic model accounting for different stiffness and strength in tension and compression is used in the analysis. The ductility demand as well as pseudo acceleration spectra are evaluated. The investigation shows that strong vertical ground motions should be considered in seismic design. From the results of this investigation suggestions for a seismic design in case of near source earthquakes can be derived. |
| キーワード | RC columns ductility demand near source earthquakes strong vertical ground motions pseudo acceleration spectra |
| 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 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 113 |
| 終了ページ | 119 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313363 |
| JaLCDOI | 10.18926/fest/11577 |
|---|---|
| フルテキストURL | 005_107_112.pdf |
| 著者 | Tohari Adrin| 西垣 誠| 小松 満| |
| 抄録 | Failures of railway embankments in Japan usually occur during rainfall period due to the rise of water level in the embankments. Laboratory experiments were carried out to elucidate the initiation of failure of embankment under the rise of water level. The changes in pore-water pressure were monitored during the rise of water table and at the initiation of failures. The experiment results showed that main failure of embankment was initiated by development of localized unstable area at the toe of the embankment models during the rise of water level. This indicates that failure of embankments was a consequence of instability of the toe of the slope induced by saturation process under drained condition. |
| キーワード | embankment failure process seepage face toe failure overall instability |
| 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 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 107 |
| 終了ページ | 112 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313411 |
| JaLCDOI | 10.18926/fest/11575 |
|---|---|
| フルテキストURL | 005_099_105.pdf |
| 著者 | 谷口 健男| |
| 抄録 | Delaunay triangulation, a geometric subdivision of any convex domain, is often used as a finite element modeling method, but there are still several problems, which originally come from the characteristics of Delaunay triangulation. One problem appears when we remove some nodes which are already introduced for the triangulation. In this case we aim to obtain the triangulation without nodes by partial modification of the Delaunay triangulation with the node. Another problem occurs when tetrahedra with zero volume are generated by Delaunay triangulation. In this case they must be removed for the numerical analysis in order to guarantee the numerical stability and good numerical solutions. In this paper these two problems occuring at the use of Delaunay triangulation are theoretically discussed. |
| キーワード | Delaunay triangulation Degeneracy Tetrahedron Automatic mesh generation |
| 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 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 99 |
| 終了ページ | 105 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313608 |
| JaLCDOI | 10.18926/fest/11570 |
|---|---|
| フルテキストURL | 003_105_120.pdf |
| 著者 | Kidtimonton Surasri| 三野 徹| |
| 抄録 | Two optimization models are formulated based on different objectives for assisting the irrigation planner in making decision on agricultural planning during drought year. The sensitive degree of water shortage area in the irrigation project are classified by those models. They are solved by simplex method. Firstly, the Two-phase method is applied to analyze the artificial variables in the formulated model. Then, the formulated model is modified after getting rid of the artificial variables to obtain the feasible solution. The agricultural planning is planned by considering the classified area with social equity and economic improvement. Crop diversification is introduced to conduct in the very sensitive water shortage area and intermittent irrigation system is introduced to operate in the moderately sensitive water shortage area. The integrated farming system, the separation of land owner and cultivator and the disposition of substitute lots system are also suggested to conduct in this study project. |
| キーワード | agricultural planning Two-phase method integrated farming sensitive water shortage disposition of substitute lots 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 | 1998-01-14 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 105 |
| 終了ページ | 120 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313819 |
| JaLCDOI | 10.18926/fest/11564 |
|---|---|
| フルテキストURL | 005_047_056.pdf |
| 著者 | 大竹 正徳| 大坪 龍介| 冨田 誠| 田中 豊| |
| 抄録 | Main content of this paper is to classify IQ individuals into two categories of normal and abnormal groups. It is too difficult to divide IQ individuals into two groups of normal IQ group and abnormal group because of sparse number of cases with mental retardation. Therefore, we examined a normality of 1673 IQ individuals, but a significant difference was noted for the IQ data. The lowest three mentally retarded cases of less than or equal to 59 IQ score were excluded, the IQ data then fitted to a normal distribution well. The critical value which minimizes the probability of classification is obtained on the basis on an approximate technique with regard to normality. An approximate probability of misclassification for individuals at random from mixture of two normal populations is 25.5%. |
| キーワード | Compound distribution normality Prenatal exposure IQ misclassification |
| 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 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 47 |
| 終了ページ | 56 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313674 |
| JaLCDOI | 10.18926/fest/11563 |
|---|---|
| フルテキストURL | 003_047_062.pdf |
| 著者 | 大竹 正德| 田中 豊| Lee Sunghee| |
| 抄録 | Exposure to ionizing radiation has been testified to have harmful effects on the developing human brain, particularly in the highly vulnerable period of 8-15 weeks after ovulation as an incereased frequency of severe mental retardation. However, the distribution of cases of severe mental retardation suggests a threshold in the low dose region. Data are composed of a binary (1,0) for mentally retarded or normal individuals. The statistical approaches with a threshold are conceivable for a simple, odds, logistic and Gompertz regression models. Estimation of threshold and 100(1-α)% confidence limits are derived from the maximum likelihood technique based on a profile approach. |
| キーワード | mental retardation threshold model prenatal exposure profile approach atomic bombings |
| 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 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 47 |
| 終了ページ | 62 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313935 |
| JaLCDOI | 10.18926/fest/11561 |
|---|---|
| フルテキストURL | 005_035_046.pdf |
| 著者 | 崔 承培| 田中 豊| |
| 抄録 | Spatial data is analyzed in three stages of 1) estimating the variograms, 2) fitting a model for the estimated variograms and 3) predicting the value at unknown location based on the information at known locations (kriging). Recently, it has become a subject of interest to detect influential observations in these stages. Choi and Tanaka(1999) have derived influence functions in the above three stages and have proposed sensitivity analysis procedure. So far influence functions have only been derived for variograms by Gunst and Hartfield(1996). The present article makes a comparison of the performances between those influence functions for variograms derived by Choi and Tanaka(1999) and by Gunst and Hartfield(1996). A real numerical example is given to discuss the validity or usefulness of those influence functions. |
| キーワード | Stationary spatal data Influence function Sample variogram Median-polish residual |
| 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 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 35 |
| 終了ページ | 46 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313332 |
| JaLCDOI | 10.18926/fest/11559 |
|---|---|
| フルテキストURL | 005_031_034.pdf |
| 著者 | 渡辺 雅二| |
| 抄録 | We study unsteady flow that models lake flow in Kojima Lake. We assume that a lake is connected to another area with gates, and that those gates are opened when the water level outside the gates is lower than the water level of the lake. We study unsteady flow due to the opening of the gates. We analyze the problem with the finite element method, and take detailed structures of the gates into account. |
| キーワード | unsteady flow lake flow 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 | 2000-02-29 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 31 |
| 終了ページ | 34 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313848 |
| 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 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 23 |
| 終了ページ | 30 |
| ISSN | 1341-9099 |
| 言語 | 日本語 |
| 論文のバージョン | publisher |
| NAID | 120002313498 |
| JaLCDOI | 10.18926/fest/11556 |
|---|---|
| フルテキストURL | 003_011_024.pdf |
| 著者 | 渡辺 雅二| |
| 抄録 | We study a system that models a problem in which an oscillatory unit is coupled to a passive medium. We analyze the case in which an RCL circuit is coupled to an RC circuit. Some numerical results indicate when slow oscillations occur in coupled systems. |
| キーワード | coupled circuits Van der Pol's equation slow oscillations |
| 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 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 11 |
| 終了ページ | 24 |
| ISSN | 1341-9099 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002313697 |
| 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 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 13 |
| 終了ページ | 21 |
| ISSN | 1341-9099 |
| 言語 | 日本語 |
| 論文のバージョン | publisher |
| NAID | 120002313531 |