JaLCDOI 10.18926/fest/11505
Title Alternative Illegally Parked Bicycles around the Okayama Station - Withdrawal, Storage and Return of Them -
FullText URL 010_089_103.pdf
Author Toyoki, Yosuke| Ichiminami, Fumikazu|
Abstract In this paper, first it is investigated illegally parked bicycles around the Okayama station, withdrawal, storage and return of them. Second, there will be a questionnaire to understand citizen's consciousness and clarify how they have been grasped present condition. Furthermore, it is aimed that considering how to carry out an efficient activity for reducing number of illegally parked bicycles. The results are concluded as follows. It is much more required to strengthening in the criminal prohibition zone by applying withdrawal activities and regulations. Presumably, first it is required to change storage area in order to increase the rate of returned bicycles. Besides, it will be great improvement in rate of return, if definite proportion of area is confidentially secured on storage area near the Okayama station. Moreover, it was remarkable that a citizen was not known in detail about an illegally parked bicycle. On the other side, recognition of most of the suburbanite of Okayama-shi tends to be impervious and replied to affirm illegally parked bicycle. However, the residents who live an area near to station understood the present condition well, and they disapprove to the illegally parked bicycle. Finally, in order to improve present condition, to prevent completely and to decrease the number of illegally parked bicycles publicity work is required.
Keywords Illegally Parked Bicycle Okayama Station Storage Area Publicity Work
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 89
End Page 103
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313985
JaLCDOI 10.18926/fest/11483
Title Alternative On Persistence in Dynamical Systems (Review)
FullText URL 010_013_021.pdf
Author Sasaki, Toru| Kajiwara, Tsuyoshi|
Abstract 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.
Keywords persistence ordinary differential equation dynamical system
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 13
End Page 21
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313932
JaLCDOI 10.18926/fest/11486
Title Alternative Variable Selection Method using Apriori Algorithm on Contingency Table
FullText URL 010_041_047.pdf
Author Ohno, Manabu| Tarumi, Tomoyuki|
Abstract We proposed a new applied method for induction of variable selection on contingency table. This method is the application of Apriori algorithm on variable selection of contigency table with iteraction. We assume that variables are dichotomous variable. We confirm that can be select variable, when minimun support is low level by using AIC on variable selection criterion.
Keywords Apriori Algorithm Varable Selection Contigency Table Interaction
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 41
End Page 47
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313938
JaLCDOI 10.18926/fest/11489
Title Alternative Considering variable selection criteria in correspondence analysis
FullText URL 010_049_056.pdf
Author Mori, Yuichi| Du, Xiao Dong| Iizuka, Masaya|
Abstract Ordinary goodness of fit criteria in correspondence analysis are considered as variable selection criteria in case correspondence analysis which is one of multivariate methods without external variables can be applied. The goodness of fit criteria focused here are proportion of cumulative eigenvalues, proportion of cumulative squared-eigenvalues and proportion of cumulative off-diagonal fitness. Each criterion is applied to a couple of real data sets and evaluated with interpretation of the selection process and result (selected subset of variables). Four selection procedures such as backward elimination and forward-backward selection are also performed to compare with each other as well as with all possible selection procedure. These results illustrate that the criteria can be used as selection criteria to select a subset of variables in correspondence analysis and to assess categorical items (questions) in a survey (questionnaire).
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 49
End Page 56
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313834
JaLCDOI 10.18926/fest/11508
FullText URL 010_111_117.pdf
Author Alam Ashraful| Takaguchi, Yutaka| Tsuboi, Sadao|
Abstract Synthesis of ellagic acid and its 4,4'-di-Ο-alkyl derivatives from gallic acid is described. Ellagic acid is prepared by oxidative coupling of gallic acid with ο-chloranil. Functionalized methyl bormogallate underwent Ullmann coupling to give the biphenyl that upon lactonization resulted in the ellagic acid and its alkoxy derivatives.
Keywords ellagic acid 4,4'-di-Ο-alkylellagic acid Ullmann coupling oxidative coupling
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 111
End Page 117
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313598
JaLCDOI 10.18926/fest/11502
FullText URL 010_083_088.pdf
Author Kankam-Yeboah Kwabena| Darko Philip K.| Nishigaki, Makoto|
Abstract Groundwater has been recognised as the most cost-effective option of safe water supply to rural communities in Ghana. The demand for potable water has led to the drilling of a large number of boreholes in many parts of the country. To establish the threshold of groundwater development from storage in a major river catchment (Pra River) in South-West Ghana, studies on recharge to the weathered aquifer and statistical evaluations of specific capacity and potential yield have been carried out. The SACSMA conceptual hydrological modelling system was used for the recharge estimate. With recharge rate of 50 mm/yr, the natural groundwater resources in the basin was estimated to support a maximum withdrawal of 12 l/s for a 10 hour per day pumping. The groundwater resources potential of 1.6 l/sk㎡ could be considered the threshold of groundwater exploitation in similar river basins in South-West Ghana. A study into the relation between permeability and recharge under different conditions and scenarios is required to define their limiting role in groundwater resources development.
Keywords Groundwater storage recharge aquifer specific capacity base flow hydrologic budget
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 83
End Page 88
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313829
JaLCDOI 10.18926/fest/11496
FullText URL 010_057_065.pdf
Author Dewan Ashraf M.| Alam Md. Mahabubul| Nishigaki, Makoto|
Abstract This paper is an attempt to develop a series of maps that precisely depict flood prone areas in Greater Dhaka, Bangladesh using remote sensing techniques. Multi-temporal RADARSAT SAR data were acquired and employed to delineate open water flood boundary during the floods of 1998 and 2000. Using a threshold algorithm, SAR data is segregated into water and non-water areas. The empirical threshold value was obtained by using visual interpretation technique, local knowledge of the study site and by deriving corresponding pixel values to land/water from each image. The result demonstrated that 53 percent of the study area was heavily inundated in 1998 flood which is the largest submerged area during a catastrophic scenario. In contrast, 35.32 percent area was flooded during the year 2000 which represents the area under water for a normal event. Using the reference data acquired from field visit, derived flood maps were further validated. Moderate accuracy is obtained for all flood maps, however, July 1998 image attained the highest overall accuracy (86%) in the dataset. The derived flood maps are expected to be useful to mitigate losses of lives and property from river water flooding in Greater Dhaka. Furthermore, this information would be worthwhile to develop an efficient flood disaster management system.
Keywords SAR open water flood 1998 and 2000 floods Greater Dhaka RADARSAT
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 57
End Page 65
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313953
JaLCDOI 10.18926/fest/11501
FullText URL 010_075_081.pdf
Author Kankam-Yeboah Kwabena| Asare Enoch B.| Gyau-Boakye, Philip| Nishigaki, Makoto|
Abstract The rapid impact assessment (RIAM), which was developed in Denmark, is a new tool for the execution of environmental impact assessments. RIAM is quite flexible, transparent and leaves a permanent record, which can be independently checked, validated or updated. RIAM has successfully been used to prioritize water resources management problems in Ghana in the order of which problems call for the most urgent attention. The priority list was easily validated and accepted to be the true reflection of the situation at a national workshop in which experts and representatives from water agencies, donor agencies, university faculties and departments, research institutes, private institutions and organizations including Non Governmental Organizations (NGOs) participated. The study has shown that RIAM, which can also be used in a developing country like Ghana, is a very useful tool in such prioritization process as has been applied in this exercise.
Keywords Water resources management problems prioritization impact indicators RIAM river basins Ghana
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 75
End Page 81
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313917
JaLCDOI 10.18926/fest/11479
FullText URL 010_001_007.pdf
Author Wang Xiao Dong| Ishikawa, Hirofumi|
Abstract The one-way hash function plays an important role in digital signatures and message authentication from the viewpoint of security. No effective attacking method has been discovered to the algorithm of hash function standard. In this study, we tried to attack SHA-256 in encryption mode using linear and differential cryptanalysis to solve a private key. We deduced that an estimate of the private key would require huge known and chosen plaintexts in both linear and differential cryptanalysis, and that it would be difficult to decipher SHA-256 in view of the required computation.
Keywords differential cryptanalysis encryption mode hash function linear cryptanalysis SHA-256
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 1
End Page 7
ISSN 1341-9099
language 日本語
File Version publisher
NAID 120002313630
JaLCDOI 10.18926/fest/11499
FullText URL 010_067_074.pdf
Author Dewan Ashraf M.| Alam Md. Mahabubul| Nishigaki, Makoto|
Abstract The objective of this paper is to delineate flood prone areas and estimate damage in Greater Dhaka during the 1998 catastrophic flood using an integrated approach of GIS and remote sensing. Time series RADARSAT SAR data is acquired and used to demarcate flood boundaries for the 1998 flood event. This was accomplished by thresholding linear SAR imageries. Flood estimation demonstrated that flood areas steadily increased from early July 1998 and peaked on 25 August 1998 inundating 53% lands due to heavy monsoonal downpour and discharge from upstream points. Different thematic layers were combined with a derived flood map in order to assess flood damage for the same event. Flood damage analysis revealed that substantial damage has occurred in Greater Dhaka during the 1998 flood.
Keywords Synthetic Aperture Radar (SAR) flood delineation 1998 flood flood damage Greater Dhaka
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 67
End Page 74
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313624
JaLCDOI 10.18926/fest/11484
FullText URL 010_023_028.pdf
Author Watanabe, Masaji| Liu Ying| Wang Ming Jun|
Abstract Topographical data of Kojima Lake have been updated by applying data obtained after dredging. Together with tide level of Kojima Bay and water levels of Kurashiki River and Sasagase river, the information was incorporated in computational analysis of unsteady flows generated in the lake when the water was discharged from Kojima Lake to Kojima, Bay. A finite element method was applied to equations governing unsteady flows, and the transition of discharge was obtained.
Keywords water environment finite element method numerical simulation
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 23
End Page 28
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313649
JaLCDOI 10.18926/fest/11485
FullText URL 010_029_039.pdf
Author Ju Xian Meng|
Abstract The generalized Grothendieck-Witt ring of nonsingular Hermitian forms with positioning map is the cartesian product of the ordinary Grothendieck-Witt ring of nonsingular Hermitian forms and a map ring. We study the generalized Grothendieck-Witt ring by computing the map ring.
Keywords Grothendieck Witt ring orbit GAP
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 29
End Page 39
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313655
JaLCDOI 10.18926/fest/11481
FullText URL 010_009_011.pdf
Author Kajiwara, Tsuyoshi| Sasaki, Toru|
Abstract 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.
Keywords Permanence dynamical system pathogen
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 9
End Page 11
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313596
JaLCDOI 10.18926/fest/11506
FullText URL 010_105_109.pdf
Author Alam Ashraful| Takaguchi, Yutaka| Tsuboi, Sadao|
Abstract Ortho-monobromination of phenols and polyphenols by 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) is described. A simple addition of commercially available DBDMH to phenols and polyphenols in chloroform at room temperature resulted in a good to excellent yield of corresponding ortho-monobromo derivatives.
Keywords ortho-monobromination phenol polyphenol DBDMH
Publication Title 岡山大学環境理工学部研究報告
Published Date 2005-02-28
Volume volume10
Issue issue1
Start Page 105
End Page 109
ISSN 1341-9099
language 英語
File Version publisher
NAID 120002313473