JaLCDOI 10.18926/fest/58060
Title Alternative Efficient modelling of 3-d finite element mesh formation with use of 3-d topographic survey
FullText URL fest_025_001_004.pdf
Author KANESHIGE, Minoru| NISHIMURA, Shin-ichi| SHIBATA, Toshifumi| SHUKU, Takayuki|
Abstract In this decade, 3-dimensional topographic survey has been developed by using the UAV as like drones. With the technique, the complete topographies of the geo-structures can be measured. Although the accurate shapes of the geo-structures can be obtained, the numerical methods as like the finite element method is are not related to the 3-dimensional survey directly. In this research, the finite mesh modelling technique with use of the 3-D topographic survey is developed. The models of the earth-fill embankments formed from measured 3-D data are introduced as the examples.
Keywords 3-dimensional survey UAV finite element mesh modelling
Publication Title 岡山大学環境理工学部研究報告
Published Date 2020-03
Volume volume25
Issue issue1
Start Page 1
End Page 4
ISSN 13419099
language 日本語
File Version publisher
JaLCDOI 10.18926/fest/48238
Title Alternative A Survey Study of University Students’ Awareness on Social Contribution and Regional Cooperation
FullText URL fest_017_007_021.pdf
Author Na, Myungjin| Araki, Masaru| Kurihara, Koji|
Abstract Recently, competition among universities has a whole new face, and emphasis is given toward interdependence and interactive evolution between universities and regions. From this social perspective, universities should contribute to regional development by serving the regional society using results of intellectual work, and it is necessary for universities to accomplish social contribution and regional cooperation strategically. One of the most important parts in strategic planning is that students participate in activities for social contribution and regional cooperation. This paper presents a survey of the university students’ awareness on social contribution and regional cooperation using several statistical methods and attempts to find factors which affect activities for social contribution and regional cooperation using logistic regression analysis.
Keywords University students’ awareness social contribution and regional cooperation volunteer activities exploratory factor analysis logistic regression analysis
Publication Title 岡山大学環境理工学部研究報告
Published Date 2012-03
Volume volume17
Issue issue1
Start Page 7
End Page 21
ISSN 2185-3347
language 日本語
File Version publisher
NAID 120004025483
JaLCDOI 10.18926/fest/12827
FullText URL 13_051_056.pdf
Author Sanghoon Han| Ishioka, Fumio| Kurihara, Koji|
Abstract Echelon analysis (Myers et al., 1997) is a method to investigate the phase-structure of spatial data systematically and objectively. This method is also useful to prospect the areas of interest in regional monitoring of a surface variable. The spatial scan statistic (Kulldorff, 1997) is a method of detection and inference for the zones of significantly high or low rates based on the likelihood ratio. These zones are called hotspots. The purpose of this paper is to detect the hotspot area for spatial data using echelon. We perform echelon analysis for Korea earthquake data. We use ESRI’s ArcGIS that is geographical information system (GIS) software to make the meshed areas and get contiguity information of these areas. With this contiguity information on the meshed areas, we detect the hotspot area using echelon analysis and spatial scan statistics. In addition, we compare with the result of analysis based on the total of number of times simply and the seismic wave energy.
Keywords Hotspot Echelon analysis Spatial scan statistics Seismic Wave Energy
Publication Title 岡山大学環境理工学部研究報告
Published Date 2008-03
Volume volume13
Issue issue1
Start Page 51
End Page 56
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002304882
JaLCDOI 10.18926/fest/12820
Title Alternative Survey Study of Resident Awareness on Waste Final Disposal Site
FullText URL 13_035_042.pdf
Author Na, Myungjin| Ono, Yusaku| Ono, Yoshiro| Kurihara, Koji|
Abstract As construction of final waste disposal site is essential recently, a problem where we should build it becomes important issue. However, public opposition occurs for the construction because the final waste disposal site has negative image such as pollution of various kinds, increase of traffic volume and noise by truck and bulldozer, and aggravation of living conditions. Public opposition is the most critical problem in constructing final waste disposal site. The source of public opposition has been characterized as NIMBY or not-in-my-yard. This paper presents a survey of the resident awareness on final waste disposal site, and attempts to find factors which affect the public opposition using logistic regression analysis and CART(classification and regression tree).
Keywords final waste disposal site resident awareness public opposition logistic regression analysis CART(classification and regression tree)
Publication Title 岡山大学環境理工学部研究報告
Published Date 2008-03
Volume volume13
Issue issue1
Start Page 35
End Page 42
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002304860
JaLCDOI 10.18926/fest/52227
Title Alternative Numerical Evaluation of the Approximation by an Influence Function
FullText URL fest_019_001_007.pdf
Author Bao, Hong Mei| Fueda, Kaoru|
Abstract For evaluating statistical models one of the most effective criteria is cross-validation. But it requires a large amount of computation. Various alternative schemes are considered to reduce its computation. Modified generalized information criterion is one of those alternative schemes. In this criterion an influence function is used to estimate the parameters of the models. By the numerical simulation we studied the effect of an influence function.  Surveying data of the lake depth are used as the sample data. We estimate the shape of lake bottom as spline surface. The estimated parameters and the estimated depths obtained by two criteria are compared and the effect of an information function is analysed.
Keywords influence function information criteria CV mGIC B-spline
Publication Title 岡山大学環境理工学部研究報告
Published Date 2014-03
Volume volume19
Issue issue1
Start Page 1
End Page 7
ISSN 2187-6940
language 英語
File Version publisher
NAID 120005394642
JaLCDOI 10.18926/fest/44790
Title Alternative Validation of Dollar cost averaging investment method
FullText URL fest_016_001_005.pdf
Author Touji, Masayuki| Fueda, Kaoru|
Abstract As a method of long term investment for private investor, the dollar cost averaging investment method is well known and seems to reduce the purchase cost because we purchase risk assets with same amount of monye every month, then we purchase many assets when the price of assets is low and few assets when the price is high. On the other hand, if the expectation of the return of the risk assets is positive, we have the maximum expectation of return when we purchase the risk assets with all of money to invest. To reduce the risk of investment, diversified investments are effective. However question whehter we use the dollar cost averaging investment method or investe money all at once to well-diversified risk assets remains. In this study, we validate the effecte of the ddollar cost averaging investment method by Monte Carlo simulation.
Keywords Dollar cost averaging investment Monte Carlo simulation Stock price index
Publication Title 岡山大学環境理工学部研究報告
Published Date 2011-03-18
Volume volume16
Issue issue1
Start Page 1
End Page 5
ISSN 2185-3347
language 日本語
File Version publisher
NAID 120002949470
JaLCDOI 10.18926/fest/12816
Title Alternative Statistical modeling for analysis of malaria epidemic behavior at Ishigaki Island
FullText URL 13_007_015.pdf
Author Ueki, Masao| Nakagawa, Yuuki| Fueda, Kaoru| Ishikawa, Hirofumi|
Abstract It is necessary to consider a stochastic variability in modeling malaria epidemic behavior since the malaria infection cycle essentially depends on stochastic elements. For this requirement, we need to construct an appropriate statistical model from available data in advance. In this report, we provide some statistical models for the analysis of malaria epidemic behavior at Ishigaki Island. These models can be used for recurrence of past malaria epidemic and prediction of future malaria epidemic at Ishigaki Island.
Keywords Anopheles minimus, generalized liner model Ishigaki Island malaria epidemic behavior prediction stochastic model
Publication Title 岡山大学環境理工学部研究報告
Published Date 2008-03
Volume volume13
Issue issue1
Start Page 7
End Page 15
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002304876
JaLCDOI 10.18926/fest/11429
Title Alternative Variable selection besed on global score estimation and its numerical investigation
FullText URL 012_029_040.pdf
Author Mori, Yuichi| Fueda, Kaoru| Iizuka, Masaya|
Abstract A variable selection method using global score estimation is proposed, which is applicable as a selection criterion in any multivariate method without external variables such as principal component analysis. This method selects a reasonable subset of variables so that the global scores, e.g. principal component scores, which are computed based on the selected variables, approximate the original global scores as well as possible in the context of the least squares. Three computational steps are proposed to estimate the scores according to how to satisfy the restriction that the estimated global scores are mutually uncorrelated. Three different examples are analyzed to demonstrate the performance and usefulness of the proposed method numerically, in which three steps are evaluated and the results obtained using four cost-saving selection procedures are compared.
Keywords principal components least square orthogonalization cost-saving selection
Publication Title 岡山大学環境理工学部研究報告
Published Date 2007-03-15
Volume volume12
Issue issue1
Start Page 29
End Page 40
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313992
JaLCDOI 10.18926/fest/11428
Title Alternative Socially Responsible Investment to Japanese Companies
FullText URL 011_031_041.pdf
Author Ikeda, Yousuke| Fueda, Kaoru|
Abstract Recently, Socially Responsible Investment, which is a policy of investment regarding with companies' social, environmental and moral value, attracts attention of investors. However, there are little data to explain the effectiveness of the SIR in Japan. In this paper we report the relation between environmental management and stock price of Japanese companies.
Keywords Socially Responsible Investment Environmental rating Eco fund
Publication Title 岡山大学環境理工学部研究報告
Published Date 2006-03-15
Volume volume11
Issue issue1
Start Page 31
End Page 41
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313974
JaLCDOI 10.18926/fest/11427
Title Alternative Kernel density estimation on the interval
FullText URL 011_027_030.pdf
Author Ueki, Masao| Fueda, Kaoru|
Abstract In the field of data analysis, including environmental data, it is important to know the shape of underlying density function. In this case, we often use histogram which provides an information about the board line of density's curve. However histogram can not be the best method when the true density function is continuous, as is often the cases. On the other hand, kernel density estimator is another popular one which gives a continuous function. In some practical cases, however, there is a case that some knowledges about the range of the data are previously given. For instance, data of percentage, such as mortality rate, only takes the values on [0,1]. This paper considers two different modifications in kernel density estimator for the data on known interval and compares them.
Keywords kernel density estimator adaptive bandwidth data on finite interval
Publication Title 岡山大学環境理工学部研究報告
Published Date 2006-03-15
Volume volume11
Issue issue1
Start Page 27
End Page 30
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313832
JaLCDOI 10.18926/fest/54864
Title Alternative Geospatial Preference for Asparagus Fields in Thailand
FullText URL fest_022_065_071.pdf
Author Morita, Hidenori| Hironaka, Shoya| Matsumoto, Yuki|
Abstract A questionnaire survey by interview to the farmhouse in Nakhon Pathom Province in Thailand had been carried out, where the asparagus farming as the cash crop have spread rapidly. Valid response from 24 farmers were obtained and Asparagus had been planted in 30 plots within 74 plots (40.5%). As the result of statistical analysis on the geospatial preference for asparagus fields by logit model in which the geospatial characteristics of plots such as elevation, slope, curvature, acreage and distance from farmhouse were adapted as the explanatory variables while the category of the cultivated crops in there was adapted as the independent variable, it became clear that as for the asparagus plots, small lots were more preferred. On the other hand, the geospatial preference for asparagus plots such as elevation, slope, curvature and distance from farmhouse did not became clear.
Keywords Land use GIS Thailand Asparagus logit model
Publication Title 岡山大学環境理工学部研究報告
Published Date 2017-03
Volume volume22
Issue issue1
Start Page 65
End Page 71
ISSN 2187-6940
language 日本語
File Version publisher
NAID 120005997445
JaLCDOI 10.18926/fest/54863
Title Alternative Evaluation of drop in official air temperature record at Okayama caused by relocation of observation field of Okayama Local Meteorological Observatory - By comparison with records observed at surrounding points -
FullText URL fest_022_061_064.pdf
Author Miura, Takeshi| Ueda, Yu| Morita, Hidenori| Chikamori, Hidetaka| Kurokawa, Masahiro| Nakashima, Yoshitaka| Oki, Yoko|
Abstract Statistical change in official temperature records at Okayama City caused by relocation of meteorological observation field of Meteorological Agency was evaluated. The observation field of Okayama local meteorological observatory was moved to the Tsushima Campus of Okayama University from the downtown area of Okayama City in March, 2015. Comparison between the air temperature records measured at meteorological agency station and the records at Tanjo Pond in Tsushima Campus, showed 0.56 ℃ drop in annual average before and after relocation. Moreover, comparison between the records of Okayama local meteorological observatory and that at the surrounding meteorological observing 9 stations showed 0.55 ℃ drop in annual average. Those results suggest that the relocation dropped annual average of air temperature by about 0.6 ℃.
Keywords Okayama Local Meteorological Observatory relocation drop in air temperature
Publication Title 岡山大学環境理工学部研究報告
Published Date 2017-03
Volume volume22
Issue issue1
Start Page 61
End Page 64
ISSN 2187-6940
language 日本語
File Version publisher
NAID 120005997444
JaLCDOI 10.18926/fest/19708
Title Alternative Swap-Rate of Entrance Examination and Its Software -SRAS-
FullText URL 004_007_018.pdf
Author Tarumi, Tomoyuki| Yamamoto, Yoshiro|
Abstract Alternative When we select N₀ student from N applicants using a result of an entrance examination, which consists of two step selection, the primary test and the secondary test. It is important to evaluate the contribution for each test. Swap-rate is one of the measure of the contribution for each stage test, and it its widely used. In this paper, we describe a population swap-rate and a sample swap-rate in the first. Next, we consider the distribution of applicants who change the result of the test from pass to fail. Finary, we introduce our system "SRAS - Swap-Rate Analysis System-", that can analyze the examination data on such point of view.
Publication Title 岡山大学環境理工学部研究報告
Published Date 1999-02-26
Volume volume4
Issue issue1
Start Page 7
End Page 18
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002309160
JaLCDOI 10.18926/fest/19695
FullText URL 004_001_006.pdf
Author Watanabe, Masaji|
Abstract According ot previous studies, we may expect that slow oscillations can occur in dynamics of a parameterized family of systems in which a biochemical oscillator is coupled to a stationary systems. We introduce some numerical results that confirm our expectation. The results suggest that it is possible for slow oscillations to occur in dynamics of a system in which an active oscillatory unit is coupled to a passive medium, and that it is possible for circadian oscillations to arise from fast glycolytic oscillations in such a coupled system.
Keywords circadian rhythm glycolytic oscillation nonlinear oscillator
Publication Title 岡山大学環境理工学部研究報告
Published Date 1999-02-26
Volume volume4
Issue issue1
Start Page 1
End Page 6
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002309099
JaLCDOI 10.18926/fest/12828
FullText URL 13_057_062.pdf
Author Liu Ying| Sumida, Shinya| Ceric Majda| Yamamoto, Kazuhiro| Watanabe, Masaji|
Abstract Numerical techniques to simulate tsunami waves are described, and numerical results are introduced. A finite difference method is applied to shallow water equations to analize the propagation of tsunami wave. Numerical results to simulate a tsunami wave generated on the Nankai Trough are introduced.
Keywords tsunami finite difference staggered grid leapfrog
Publication Title 岡山大学環境理工学部研究報告
Published Date 2008-03
Volume volume13
Issue issue1
Start Page 57
End Page 62
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002304776
JaLCDOI 10.18926/fest/12824
Title Alternative Estimate of the posted land price in Okayama city and its visualizing system
FullText URL 13_043_049.pdf
Author Nakao, Kazuo| Tarumi, Tomoyuki|
Abstract The posted land price is a decrared land price from Land Appraisal Committee, and current market price is selling price of the market. In this paper, we investigate the methods to estimate land price from the posted land price in Okayama city, and create the visualizing system of the price on.
Keywords Land price Google maps GIS Ajax
Publication Title 岡山大学環境理工学部研究報告
Published Date 2008-03
Volume volume13
Issue issue1
Start Page 43
End Page 49
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002304790
JaLCDOI 10.18926/fest/12818
Title Alternative Spatial analysis of Kawaguchi City crime data
FullText URL 13_017_022.pdf
Author Ohshimo, Yuki| Tarumi, Tomoyuki|
Abstract In this paper, we built some models of the spatial data, and evaluate those, using the crime data of Kawaguchi city, Saitama prefecture in Japan. Compute the Moran’I statistics of five crime data related to thefts in the city, the value of sneakthief take the aggregation. So, we pay attention to the sneak, and make a model to estimate the incidence of the events. As a regression, we select the old-age index among regional indexes. Applying a simple regression(SR), a spatial autoregressive model(SAR), a geographically weighted regression(GWR) , we evaluate these models. In GWR model, it is interesting that there are some sections in which the sign of the coefficient takes the opposite versus SR and SAR models. So, stratifying the data by the sign of it, we investigate to data precisely.
Keywords crime data Kawaguchi city spatial analysis spatial autoregressive model geographically weighted regression
Publication Title 岡山大学環境理工学部研究報告
Published Date 2008-03
Volume volume13
Issue issue1
Start Page 17
End Page 22
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002304883
JaLCDOI 10.18926/fest/11613
FullText URL 001_055_064.pdf
Author Watanabe, Masaji|
Abstract We analyze some mathematical problems that arise in studies of phenomena observed in the cardiac action. We illustrate a method to characterize the response of a nonlinear oscillator to an external forcing, and introduce some numerical results. We also introduce some results of numerical computation in an example of a coupled system of an excitable system and a nonlinear oscillator.
Keywords periodic forcing nonlinear oscillators excitable systems couples systems.
Publication Title 岡山大学環境理工学部研究報告
Published Date 1996-03
Volume volume1
Issue issue1
Start Page 55
End Page 64
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313699
JaLCDOI 10.18926/fest/11610
FullText URL 001_047_053.pdf
Author Sasaki, Toru| Ishikawa, Hirofumi| Kajiwara, Tsuyoshi| Watanabe, Masaji|
Abstract 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.
Keywords Kojima lake Water analysis Finite element method
Publication Title 岡山大学環境理工学部研究報告
Published Date 1996-03
Volume volume1
Issue issue1
Start Page 47
End Page 53
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313787
JaLCDOI 10.18926/fest/11596
FullText URL 002_019_024.pdf
Author Watanabe, Masaji|
Abstract We study a system obtained by coupling a nonlinear oscillator and a stationary system. We analyze the dynamics in a singular limit and show that asymptotically orbitally stable periodic solutions can exist. We also show how a slow oscillation can arise in the coupled system.
Publication Title 岡山大学環境理工学部研究報告
Published Date 1997-01-10
Volume volume2
Issue issue1
Start Page 19
End Page 24
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313835