| JaLCDOI | 10.18926/fest/11577 |
|---|---|
| FullText URL | 005_107_112.pdf |
| Author | Tohari Adrin| Nishigaki, Makoto| Komatsu, Mitsuru| |
| Abstract | 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. |
| Keywords | embankment failure process seepage face toe failure overall instability |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 107 |
| End Page | 112 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313411 |
| JaLCDOI | 10.18926/fest/11576 |
|---|---|
| Title Alternative | Dynamics of the Indian Automobile Industry: Recent Growth and Location |
| FullText URL | 003_135_144.pdf |
| Author | Tomozawa, Kazuo| |
| Abstract | In recent years, India has enjoyed economic prosperity that she had never experienced from the time on the independence. This article discusses dynamics of the automobile industry, one of the highest growth manufacturing sectors under the liberalization policy in the 1990s. After a brief historical explanation of the industry, the author describes corporate strategies of new comers, classified into three divisions; i.e. passenger car, commercial vehicle and two wheelers. Then he also analyze their distribution patterns from the view point of transport cost and Indian industrial location policy. The location of car assembly units in the 1990s tends to concentrate in greenfields on the outskirts of the existing agglomerations of the automobile industry. |
| Keywords | automobile industry liberalization industrial location India |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 135 |
| End Page | 144 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002314042 |
| JaLCDOI | 10.18926/fest/11575 |
|---|---|
| FullText URL | 005_099_105.pdf |
| Author | Taniguchi, Takeo| |
| Abstract | 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. |
| Keywords | Delaunay triangulation Degeneracy Tetrahedron Automatic mesh generation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 99 |
| End Page | 105 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313608 |
| JaLCDOI | 10.18926/fest/11574 |
|---|---|
| FullText URL | 003_127_134.pdf |
| Author | Shimada, Kiyoshi| |
| Abstract | This paper discusses the shear strength and volume change characteristics of a loose Fraser River sand. Suction-controlled simple shear tests were carried out for the unsaturated sand. Drained tests for the saturated sand were also carried out for the comparison with the unsaturated sand. The increase of the shear strength of the sand with the matric suction is very small and there is almost no increase of that over 20 kPa of the matric suction. The suppression effect of the matric suction on the volume change bahavior during shear is small, and the degree of dilation increases with the increase of the matric suction. |
| Keywords | unsaturated sand shear strength simple shear test matric suction volume change dilatancy |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 127 |
| End Page | 134 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313902 |
| JaLCDOI | 10.18926/fest/11572 |
|---|---|
| Title Alternative | Comparison of micrometeorological environments inside and outside a watermelon plastic greenhouse |
| FullText URL | 003_121_126.pdf |
| Author | Morita, Noboru| Miura, Takeshi| |
| Abstract | The use of glass and plastic greenhouses have rapidly increased in recent years. Meteorological and soil moisture environments inside a greenhouse are significantly different from those in the open field. These differences should be understandable to establish accurate predictions of water consumption and evapotranspiraton inside a greenhouse which play impotrant roles in the design of any irrigation system. This study aims to estimate the micrometeorological conditions inside a watermelon plastic greenhouse which can be used for evapotranspiration calculations. Therefore, micrometeorological data were measured inside and outside the greenhouse for the comparison purposes. The results of this study may be summarized as : (1) Solar radiation inside the greenhouse was about 70% of that of outside it. (2) Net radiation during the daytime inside the greenhouse was almost the same as the absorbed total short-wave radiation. (3) The difference of air temperature inside and outside the greenhouse was very large during the daytime whereas not much difference was observed during the nighttime. (4) Both relative humidity and saturation deficit inside the greenhouse were higher than outside in case of highly vegetative land. (5) Wind speed inside the greenhouse was almost zero, while outside the average value was 1.8m/s. |
| Keywords | plastic greenhouse micrometeorology watermelon |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 121 |
| End Page | 126 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313884 |
| JaLCDOI | 10.18926/fest/11571 |
|---|---|
| FullText URL | 005_081_098.pdf |
| Author | Magda Waldemar| Maeno, Shiro| Nago, Hiroshi| |
| Abstract | A dynamic response of a submarine pipeline buried in sandy seabed sediments to water loading generated by harmonically oscillating water-table vertical movements is examined in the present report experimentally and numerically. The aim of small-scale laboratory experiments was: (1) to record time-histories of pipeline vertical displacements, and (2) to observe a shape of slip surface of an overburden sand body involved in breakout together with the pipeline. A parametric study was carried out in order to investigate the influence of two meaningful factors, that is the depth of burial and the specific gravity of pipeline, on a gradual upward displacement of the pipeline. Based on a numerical finite-element 2D-analysis of the hydrodynamic pore pressure and effective stresses oscillations in the pipeline vicinity, an analysis of the pipeline stability potential is presented, in which all the experimental cases tested are verified. All important component forces (e.g., hydrodynamic uplift force) associated with floatation phenomenon of the buried submarine pipeline are considered and quantified. |
| Keywords | submarine pipeline surface waves pore pressure floatation stability |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 81 |
| End Page | 98 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313700 |
| JaLCDOI | 10.18926/fest/11570 |
|---|---|
| FullText URL | 003_105_120.pdf |
| Author | Kidtimonton Surasri| Mitsuno, Toru| |
| Abstract | 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. |
| Keywords | agricultural planning Two-phase method integrated farming sensitive water shortage disposition of substitute lots system |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 105 |
| End Page | 120 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313819 |
| JaLCDOI | 10.18926/fest/11569 |
|---|---|
| FullText URL | 005_071_079.pdf |
| Author | Jafar Ali Mohammad| Takeshita, Yuji| Fujii, Hiroaki| |
| Abstract | In-situ determination of fundamental hydraulic parameters like variably saturated hydraulic conductivity (K(FS)) and the matric flux potential (Φ(m)) provides a foundation from which several other unsaturated soil parameters can be estimated, namely the Alpha (α*) parameter. This Alpha parameter is the one of the components of 3D unsaturated flow in vadose zone and its value is the measure of the capillary component of unsaturated flow pattern. Here an in-situ technique, Pressure Infiltrometer is introduced to record the steady flow rate applying a constant positive head on an unsaturated soil surface. The aim of this paper is to check the shape factor of 3D flow geometry and to find out its sensitivity on other unsaturated hydraulic parameters and to find out the influence of Alpha parameters on the results of the in-situ estimation of field-saturated hydraulic conductivity. |
| Keywords | Field-saturated hydraulic conductivity Matric flux potential Alpha parameter Shape factor In-situ test |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 71 |
| End Page | 79 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313869 |
| JaLCDOI | 10.18926/fest/11568 |
|---|---|
| FullText URL | 003_097_104.pdf |
| Author | Hassan Muhammad Qumrul| Okubo, Kenji| |
| Abstract | Surface air temperature distribution over the Ganges Delta Region of southwest Bangladesh and its tendency of warming are discussed through the analyses based upon the long-term temperature data from 1900-93. The data consist of two parts corresponding to the time-periods: 1973-93 and 1900-72. The study area is one of most affected places by the annual monsoon hydrological cycle and the present observation from these temperature data indicate that the surface air temperature gradient in the north-south direction is significant in the rainy season and that the temperature of the region is at an increasing tendency; the warming rate during the data periods (1900-93) on the long-term mean annual basis is estimated as 0.77℃ at Satkhira of the Khulna division and 0.29℃ as an areal average including the Barisal division, for the time difference of about half a century between the data periods before and after 1972. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 97 |
| End Page | 104 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313675 |
| JaLCDOI | 10.18926/fest/11567 |
|---|---|
| FullText URL | 003_075_095.pdf |
| Author | Magda Waldemar| Maeno, Shiro| Nago, Hiroshi| |
| Abstract | The response on sandy seabed sediments to a harmonically oscillating water-table, with a special consideration of the wave-induced pore-pressure oscillations around a pipeline buried in seabed sediments, is studied in the present work experimentally and numerically. The aim of the analysis was: (1) to observe a true distribution pattern of the wave-induced pore-pressure oscillations acting on the pipeline outer surface, and (2) to verify small-scale test results using numerical computations performed for a wide range of saturation conditions of seabed sediments, under the assumption of a compressible two-phase medium compound of the pore-fluid and soil skeleton, as well as a finite thickness of a permeable seabed layer. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 75 |
| End Page | 95 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313821 |
| JaLCDOI | 10.18926/fest/11566 |
|---|---|
| FullText URL | 005_057_069.pdf |
| Author | Fujita, Ryousuke| |
| Abstract | Let G be a finite group, Y a finite connected G-CW-complex, and let Ⅱ(Y) denote G-poset (in the sense of Oliver-Petrie) associated to Y. They defined the abelian group Ω(G,Ⅱ(Y)) consisting of all equivalent classes of Ⅱ(Y)-complexes. They also defined the subgroup Φ(G,Ⅱ(Y)) related to Ⅱ(Y)-resolutions. We call Φ(G,Ⅱ(Y)) the resolution module of Y. Applying the Oliver-Petrie theory to the universal covering space Y, we obtain the group Ω(G,Ⅱ(Y)), where G is a certain extension of G by π(1)(Y). Then the canonical homomorphism ν : Ω(G,Ⅱ(Y))→ Ω(G,Ⅱ(Y)) induced by the projection Y → Y is an isomorphism. In this paper, for G = Z(p)×Z(q) we construct a finite G-CW-complex Y such that π(1)(Y) Zq and ν(Φ(G,Ⅱ(Y)) ≠ Φ(G,Ⅱ(Y)), where p and q are arbitrary distinct primes. |
| Keywords | G-CW-complex G-map G-poset |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 57 |
| End Page | 69 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313951 |
| JaLCDOI | 10.18926/fest/11565 |
|---|---|
| Title Alternative | An Analysis on the Structure of Evaluating Street Landscape Through Semantic Differential Technique |
| FullText URL | 003_063_074.pdf |
| Author | Inouye, Hiroshi| Fujii, Makiko| |
| Abstract | The structure on the evaluation of street landscape by men is analyzed through semantic differential technique. Some characteristic streets in Okayama and Kurashiki cities are selected for the analysis and they are evaluated by many subjects using their photographs. The results are outlined on their profile curves. Then, they are analyzed through factor analysis and some communal factors are induced. It is explained what these communal factors mean. Finally, it is considered how to make beautiful and comfortable street landscape. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 63 |
| End Page | 74 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313379 |
| JaLCDOI | 10.18926/fest/11564 |
|---|---|
| FullText URL | 005_047_056.pdf |
| Author | Otake, Masanori| Ohtsubo, Ryusuke| Tomita, Makoto| Tanaka, Yutaka| |
| Abstract | 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%. |
| Keywords | Compound distribution normality Prenatal exposure IQ misclassification |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 56 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313674 |
| JaLCDOI | 10.18926/fest/11563 |
|---|---|
| FullText URL | 003_047_062.pdf |
| Author | Otake, Masanori| Tanaka, Yutaka| Lee Sunghee| |
| Abstract | 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. |
| Keywords | mental retardation threshold model prenatal exposure profile approach atomic bombings |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 62 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313935 |
| JaLCDOI | 10.18926/fest/11562 |
|---|---|
| FullText URL | 003_037_046.pdf |
| Author | Kim Hyum-Jeong| Tarumi, Tomoyuki| Tanaka, Yutaka| |
| Abstract | The present paper deals with multivariate analyses applied to the maximum likelihood estimate(s) for (the mean vector and) the covariance matrix based on incomplete data, and derives influence functions for the mean vector, the covariance matrix and some statistics in multivariate analyses. Influential directions in the sense of Cook's local influence are also derived. A numerical example is given to show the usefulness of the proposed method. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 37 |
| End Page | 46 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313576 |
| JaLCDOI | 10.18926/fest/11561 |
|---|---|
| FullText URL | 005_035_046.pdf |
| Author | Choi, Seung Bae| Tanaka, Yutaka| |
| Abstract | 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. |
| Keywords | Stationary spatal data Influence function Sample variogram Median-polish residual |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 35 |
| End Page | 46 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313332 |
| JaLCDOI | 10.18926/fest/11560 |
|---|---|
| FullText URL | 003_031_036.pdf |
| Author | Sasaki, Toru| Kajiwara, Tsuyoshi| Ishikawa, Hirofumi| |
| Abstract | 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. |
| Keywords | Upwind-type Finite element method Kojima Lake |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 36 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313715 |
| JaLCDOI | 10.18926/fest/11559 |
|---|---|
| FullText URL | 005_031_034.pdf |
| Author | Watanabe, Masaji| |
| Abstract | 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. |
| Keywords | unsteady flow lake flow finite element method |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 34 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313848 |
| JaLCDOI | 10.18926/fest/11558 |
|---|---|
| FullText URL | 003_025_029.pdf |
| Author | Kajiwara, Tsuyoshi| |
| Abstract | In this paper, we define coaction crossed product of Hilbert C*-bimodule by finite groups. We show that resulting bimodule is of finite type, and compute indices of them. We present a Takesaki-Takai duality theorem which is some non-commutative generalization of abelian groups case in [KW2]. |
| Keywords | Hilbert bimodule Coaction Crossed product |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 25 |
| End Page | 29 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313716 |
| JaLCDOI | 10.18926/fest/11557 |
|---|---|
| Title Alternative | Mathematical analysis of virus infectious diseases by ordinary differential equations |
| FullText URL | 005_023_030.pdf |
| Author | Sasaki, Toru| Kajiwara, Tsuyoshi| |
| Abstract | 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. |
| Keywords | Virus Mathematica models HIV HCV HBV |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 23 |
| End Page | 30 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313498 |
