result 23573 件
| 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 | Japanese |
| File Version | publisher |
| NAID | 120002313834 |
| JaLCDOI | 10.18926/fest/11487 |
|---|---|
| FullText URL | 008_001_007.pdf |
| Author | Tsunekuni Yasuhiro| Ohga Yukio| Ishikawa, Hirofumi| |
| Abstract | In 1990s, there were rapid increases in the number of HIV epidemics and AIDS cases in Thailand, Southeast Asia. In particular the risk of HIV infection was very high among female prostitutes who played a large part in the transmission of HIV infection. We formulated a mathematical model for the transmission of HIV in prostitutes. We carried out the model simulations to analyze the incipient spread of HIV infection and the effect of AIDS prevention methods in prostitutes. The simulation of our model indicates that even if the effect of AIDS prevention methods such as the recommendation of condom use for commercial sex workers would block the transmission at rate by 70%, the elimination of the HIV epidemic is still beyond attainment. |
| Keywords | AIDS HIV prostitution Thailand transmission model |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2003-03 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 7 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002314019 |
| 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 | Japanese |
| File Version | publisher |
| NAID | 120002313938 |
| 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 | English |
| File Version | publisher |
| NAID | 120002313655 |
| 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 | Japanese |
| File Version | publisher |
| NAID | 120002313932 |
| JaLCDOI | 10.18926/fest/11480 |
|---|---|
| Title Alternative | A Case Study on How to Teach English at University Adopting TOEIC (2) -Evaluation after three years- |
| FullText URL | 009_167_178.pdf |
| Author | Morokawa, Shigetake| Ogino, Masaru| Kanzaki, Ken-ichi| |
| Abstract | Three years ago, we wrote an essay about our new English-teaching program that adopted TOEIC. We gave out questionnaires to the students with questions ranging from what they thought of English in general to what they thought of our new program. In the essay, we discussed some of the results. Even though students' response was relatively positive in this initial survey, we wrote in our conclusion that we would like to renew and reform our classes. Receiving feedback from students periodically would help us improve their English ability. In order to see the change of students' attitude toward English and also toward our program, we conducted the same research last February. This time the results were not as favorable. For example, the number of students who thought their English ability was poor increased and those who showed a positive attitude toward our program decreased. We discussed and wrote what we learned from those results. We raised the question whether there was a gap between what we tried to teach to the students and what they wanted from us. Possible reasons were discussed on why we could not succeed in stimulating the students into studying English further. In April 2003 Okayama University started a new English curriculum, in which the classes for proficiency tests including TOEIC were opened. Similar classes have been set at many other universities. This survey will be a help to the further development of English education adopting TOEIC. |
| Keywords | TESOL TOEIC questionnaires team teaching |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 167 |
| End Page | 178 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313460 |
| 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 | Japanese |
| File Version | publisher |
| NAID | 120002313630 |
| JaLCDOI | 10.18926/fest/11477 |
|---|---|
| Title Alternative | Efficient Chain Extension Reaction of Poly (butylene terephthalate) by using Crystallization |
| FullText URL | 012_167_171.pdf |
| Author | Ihara, Seiji| Shiroma, Hisashi| Yamazaki, Shinichi| Kimura, Kunio| |
| Abstract | Plastics are quite important materials for not only industrial usages but also our daily life. Many plastics are difficult to reuse because they are susceptible to UV, hydrolysis and so on leading to the reduction of molecular weight. Among them, poly (butylenes terephthalate) (PBT) is a valuable materials prepared by polycondensation reaction, and PBT has the same limitation to reuse. Hence, efficient chain extension reaction for recovered PBT has been needed to improve the properties damaged by chain scission. In this study, new chain extension reaction had been examined by using crystallization as pre-treatment. Isothermal crystallization at 161℃ concentrated the chain end-groups on the surface of the crystals, and chain extension reaction at 210℃, which was lower than the melting temperature of PBT, enhanced the molecular weight significantly compared with the reaction over the melting temperature. It concluded that the pre-treatment of crystallization was favorable for the efficient chain extension reaction and this result provided the new technology for the effective reuse of the plastics. |
| Keywords | Polyester material recycle crystallization chain extension reaction |
| 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 | 167 |
| End Page | 171 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002314029 |
| JaLCDOI | 10.18926/fest/11476 |
|---|---|
| Title Alternative | Evaluation of Surface State of Ceramic Particles Suspended in Aqueous Solution by Potentiometric Titration Method |
| FullText URL | 009_153_162.pdf |
| Author | Miura, Yoshinari| Nanba, Tokuro| Shinoda, Masakatsu| |
| Abstract | Surface states of ceramic particles such as SiO(2), Al(2)O(3), Si(3)N(4) and so on suspended in aqueous alkaline solutions were successfully and easily determined by a potentiometric titration method. Isoelctric point, iep and excess surface charge density were classified and evaluated for many ceramic particles from the view points of aggregation and dispersion of particles and solubility in aqueous solution. |
| Keywords | potentiometric titration method isoelctric point excess surface charge density ceramic particle suspension aqueous solution |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 153 |
| End Page | 162 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313753 |
| JaLCDOI | 10.18926/fest/11474 |
|---|---|
| Title Alternative | Agricultural trend of Inner Mongolia And Policy of Replacing Agriculture by Afforestation A Case Study of Zhuo Zi Xian, Wu Lan Cha Bu Meng |
| FullText URL | 009_141_151.pdf |
| Author | Du, Fu-Lin| Shinabe, Yoshihiro| |
| Abstract | In this paper, Background of Policy of Replacing Agriculture by Afforestation is clarified by means of the relation of the local Agricultural trend due to performance of the policy, united it the influence in the living and agriculture production to farmer in Zhuo Zi Xian. The investigation to the feasibility of the policy is based on the statistics data and the investigation of the agriculture in Inner Mongolia of China. In progress of the Policy of Replacing Agriculture by Afforestation, change of crop structure and development of animal husbadry were mainly seen in local agriculture. It made "Replacing Agriculture by Afforestation" possible. In order to perform this policy, to prevent retrogradation and develop local Agriculture continuously, technological development and spread in the Sustainable Agriculture, Training of Products processing company and Exploitation of the Products market of Agriculture, Forestry and Stockbreeding should be considered in the future study. |
| Keywords | replacing agriculture by afforestation policy make one stop two Return three Agricultural trend Inner Mongolia China |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 141 |
| End Page | 151 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313842 |
| JaLCDOI | 10.18926/fest/11473 |
|---|---|
| Title Alternative | Acceleration of Formation of Shish under Flow by Addition of Irregular Shaped Particles |
| FullText URL | 012_157_160.pdf |
| Author | Yamazaki, Shinichi| Wakabayashi, Kanji| Mizuma, Kenta| Kimura, Kunio| |
| Abstract | We have shown that the shish was formed from the oriented melt composed of the elongated chains caused by dust particles within the melt via bundle typed nucleation under flow with low shear rate (γ=5s(-1)). This implies that dust particles effectively cause the elongation of chains within the melt. In this work, we observed the crystallization of polypropylene added with irregular shaped particles under shear flow by means of polarizing optical microscope. We prepared various shaped particles such as confetti-like, spherical and rock-like. We found that the size and asymmetric shape of additive particles play an important role for the acceleration of formation of shish. |
| Keywords | shish crystallization polypropylene shear flow elongation injection molding |
| 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 | 157 |
| End Page | 160 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313610 |
| JaLCDOI | 10.18926/fest/11470 |
|---|---|
| Title Alternative | Diversity of Agricultural Production and Its Change in Tottori Prefecture |
| FullText URL | 009_121_135.pdf |
| Author | Ichiminami, Fumikazu| |
| Abstract | In this paper, diversity of agricultural production and its change was examined for some 45 years in Japan and for 1960, 1980, and 2000 in Tottori prefecture. The concept of entropy was used in order to measure the diversity of the agricultural production which consists of some sections. Agricultural production section in Japan has been diversified in the long run. The ratio of rice has been decreasing gradually for a policy of cutting back on the acreage under cultivation. Although the ratio of stock raising and fruits has increased, it tends in recent years to stagnate. The rate of vegetables has increased remarkably. Combination type for every municipalities was determined with the standard value A method, and complemented examination of agricultural diversity. |
| Keywords | Agricultural Production Diversity Entropy Sustainability Tottori Prefecture |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 121 |
| End Page | 135 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313477 |
| JaLCDOI | 10.18926/fest/11467 |
|---|---|
| Title Alternative | Rows-of-houses Preservation in Maniwa City of Katsuyama Area, Okayama Prefecture |
| FullText URL | 012_141_149.pdf |
| Author | Luo, Yanjuan| Ichiminami, Fumikazu| |
| Abstract | The aim of the study is to explain the present condition of the rows-of-houses preservation policy of Okayama Prefecture and to examine the samples in Maniwa city, Katsuyama area. Besides, the interview investigation was mainly conducted for residents in the rows-of-houses of preservation area in Katsuyama for giving the concluding remarks about the findings. The traditional private houses in Katsuyama preservation area were partially restored in the 1985-89 and 1993-97 fiscal years by the subsidy from the prefecture. Furthermore, Katsuyamacho at that time founded the subsidy system for maintaining rows-of-houses preservation area (about 25.3 ha) independently in 1993, restored 9 private houses, and made and updated the shop curtains; "Noren". In the point of the observable items, the ground warehouse of structures with gable tile-roofing is visible and it is also in use. Moreover, a latticed window structure, a white wall, and a sea cucumber wall constitute the charm of new rows-of-houses. A stone pavement follows on the riverside at the site facing the Asahi River. There are the remains of an arrival-and-departure place of a flat boat and a brewery, etc. According to our investigation in 2002, the residents were satisfied with "It is easy to live quietly", "the beauty of a natural landscape", "harmony of rows-of-houses and a shop curtain", and "a historical atmosphere", but the recognition of "the creation of active rows-of-houses" was unexpectedly low. Therefore, cooperation between residents and informational sharing are much more required. Consequently, since both the visitors and the residents are satisfied very much with each facilities, such as the whole rows-of-houses, a samurai residence, a brewery, and a restaurant etc., town planning is well organized and attained the priority targets. |
| Keywords | Rows-of-houses Preservation Katsuyama area Visitors Residents |
| 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 | 141 |
| End Page | 149 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313778 |
| JaLCDOI | 10.18926/fest/11465 |
|---|---|
| Title Alternative | A Survey Study of Residential Awareness on Utilization Function of Agricultural Water and Its Maintenance --A case study in Niwase and Natsukawa of Okayama City, Okayama Prefecture |
| FullText URL | 012_131_140.pdf |
| Author | Makino, Tota| Matsuoka, Takanobu| Qi, Zhiyong| Shinabe, Yosihiro| |
| Abstract | The agricultural water has manifold functions for farming at community level. However, along with the difficulties to maintain the agriculture water path that are caused by the decreasing of farmers and the aging of the society, the agricultural water is losing its functions even that as water resource for local community. This paper presents a survey of the residential awareness on regional water utilization to find the possibility for the maintenance of agricultural water path. Economic evaluation is tried for the regional warter utilization function. This study is carried out at a regional level that covers both farming households and non farmers. Following three points can be confirmed based on the results of questionnaire survey. Firstly, local citizens admit that the agricultural water does have some values (3,037 Yen per household per year). Secondly, the higher the environmental awareness is, and the longer the citizen has lived there, the higher evaluation to function of the agricultural water can be observed. Thirdly, even within those who is holding high evaluation to the agricultural water, it is thought to be quite difficult to maintain the agricultural water path due to the aging of the society and uneven distribution of the participants. |
| Keywords | agricultural water manifold functions for farming at community level local citizens maintenance Contingent Valuation Method |
| 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 | 131 |
| End Page | 140 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313592 |
| JaLCDOI | 10.18926/fest/11464 |
|---|---|
| FullText URL | 009_087_098.pdf |
| Author | Kankam-Yeboah Kwabena| Gyau-Boakye Philip| Nishigaki, Makoto| Komatsu, Mitsuru| |
| Abstract | Three principal river basins are found in Ghana and the Volta River Basin is the major one, covering about three -quarters of Ghana. The basin is shared with Mali, Burkina Faso, Cote d'Ivoire, Togo and Benin. Water from the Volta River Basin is used for drinking water supply, generating hydro-electric power, irrigation, inland fisheries and lake transport. The sustainable management of the Volta River Basin is thus of great importance. Land use activities in the basin are thus closely monitored not only in Ghana, but also in the other riparian countries as well. This paper presents information and data on the water resources and environmental management of the Volta River Basin in Ghana. |
| Keywords | water resources environmental management Volta River Basin Ghana water utilization |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 87 |
| End Page | 98 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313917 |
| JaLCDOI | 10.18926/fest/11462 |
|---|---|
| Title Alternative | Comparison of micrometeorological environments inside and outside an oriental pickling melon greenhouse. |
| FullText URL | 012_125_130.pdf |
| Author | Morimoto, Yuji| Hirano, Emi| Miura, Takeshi| |
| Abstract | The use of greenhouses has rapidly increased after 1965, and the area became 11 times of 1965 as of 2001. Meteorological conditions 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 evapotranspiration inside a greenhouse which play important roles in the design of any irrigation system. This study aims to estimate the micrometeorological conditions inside an oriental pickling melon 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 decreased about 30% of that of outside it by plastic film and frame. (2) Net radiation during the daytime inside the greenhouse was almost the same as the absorbed total short-wave radiation. (3) The difference of daytime mean air temperature inside and outside the greenhouse was between 3 and 4 degree Celsius in day average. (4) Both relative humidity and saturation deficit inside the greenhouse were higher than outside, and those were affected by ventilation. (5) Wind speed inside the greenhouse was greatly affected by opening rate of the house side. |
| Keywords | greenhouse micrometeorology oriental pickling melon |
| 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 | 125 |
| End Page | 130 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313863 |
| JaLCDOI | 10.18926/fest/11460 |
|---|---|
| Title Alternative | Measurement of root system with growth of oriental pickling melon. |
| FullText URL | 012_119_123.pdf |
| Author | Hirano, Emi| Morimoto, Yuji| Miura, Takeshi| |
| Abstract | It is important to clarify how the soil moisture changes by irrigation and how moisture is consumed by absorption of root, to plan irrigation appropriately in upland field. And, it is thought that clarifying the growth of the root can be important information in the water management, because the amount and the pattern of root water uptake change depending on the growth stage. However, there are not too much a lot of researches that measure the root, in addition, the example intended for crops of 'Gourd family (scientific name:Cucurbitaceae)' is not found. Therefore, for oriental pickling melon, it measured how for the root system to grow up as crop grew every three weeks. The results of this study may be summarized as: 1) Root amount increased with the growth of crops, and the majority of the root existed to 20cm in depth. A lot of rootlets with the role of water uptake existed outside of from 10 to 20cm. 2) Root length has grown up in horizontal and vertical direction at a dash at the stage of growing initial. 3) It was able to be confirmed to the growth of the ground part and the root that the length and amount either also had implications. Moreover, root amount and plant caver ratio drew similar curve. |
| Keywords | root growth oriental pickling melon |
| 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 | 119 |
| End Page | 123 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313695 |
| JaLCDOI | 10.18926/fest/11459 |
|---|---|
| Title Alternative | CO(2) Fluxes Measured by Eddy Correlation and Aerodynamic Techniques |
| FullText URL | 009_069_073.pdf |
| Author | Inohara, Sachiko| Iwata, Toru| Ohtaki, Eiji| |
| Abstract | To elucidate the seasonal and inter-annual variation of CO(2) exchanges between the atmosphere and cultivated field in Japan, the CO(2) flux has been measured by the eddy correlation technique at the experimental farm of Agricultural Faculty, Okayama University since December in 1998. The CO(2) sensor, however, does not work under rainy conditions. The improved aerodynamic technique was developed and used to cover CO(2) flux data which were not collected. This technique gives reasonable CO(2) fluxes even in rainy days. The reliability of the technique was also confirmed by comparing CO(2) fluxes with those measured by the eddy correlation technique using data in fine weather conditions. |
| Keywords | CO(2) flux Eddy correlation technique Aerodynamic techniques Dimensionless profile |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 69 |
| End Page | 73 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313999 |
| JaLCDOI | 10.18926/fest/11457 |
|---|---|
| Title Alternative | Study on Effects of the Density Current Generator by Experiment and Measurement |
| FullText URL | 009_059_064.pdf |
| Author | Watanabe, Masaji| Yamatogi, Toshio| |
| Abstract | The density current generator (Manufacturer: Nakashima Propeller Co., Ltd., Patent owner: Hitachi Metals, Ltd.) is designed to generate vertical circulation over a wide water area harnessing the density current effect. We present some experimental results that we obtained using a float equipped with a GPS unit to study water flows generated by a density current generator unit set in S-Reservoir in Okayama Prefecture. We also present some measured results concerning the water temperature around the unit. We discuss its effects observing the experimental results and the measured results. |
| Keywords | density current stratification water environment |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 59 |
| End Page | 64 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313754 |
| JaLCDOI | 10.18926/fest/11453 |
|---|---|
| FullText URL | 009_037_044.pdf |
| Author | Sung Jimin| Tanaka, Yutaka| |
| Abstract | There have been proposed so far many methods of statistical diagnostics in Cox regression for checking the goodness of the estimated model or checking the adequacy of the data. The former type contains the checking of the overall goodness of fit, the validity of the assumption of proportional hazards and the proper functional forms of the effects of covariates. While the latter type contains the checking whether there exist singly and/or jointly influential observations in the data set. In the present paper we study numerically the performances of various methods of diagnostics including our method of influence analysis for multiple-case diagnostics (Sung and Tanaka, 2003) by analyzing a real data set of lung cancer patients. |
| Keywords | Cox regression Influence function Local influence Influential Subsets Cox-Snell residuals Martingale residual Deviance residual |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 37 |
| End Page | 44 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313595 |
