result 13726 件
| Author | Okayama Association for Laboratory Animal Science| |
|---|---|
| Published Date | 2009-03 |
| Publication Title | 岡山実験動物研究会報 |
| Volume | volume25 |
| Content Type | Others |
| Author | Park, Jae Hyun| Okadakage, Sakiko| Sato, Yasumori| Akamatsu, Yutaka| Tai, Kiyoshi| |
|---|---|
| Published Date | 2010-10 |
| Publication Title | Journal of Esthetic and Restorative Dentistry |
| Volume | volume22 |
| Issue | issue5 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/AMO/45274 |
|---|---|
| FullText URL | 65_2_143.pdf |
| Author | Kobayashi, Yasuyuki| Saika, Takashi| Manabe, Daisuke| Nasu, Yasutomo| Kumon, Hiromi| |
| Abstract | We analyzed the prognostic factors influencing survival after surgeries for upper urinary tract urothelial carcinoma (UUT-UC) with longer follow-up periods than in previous studies. Between January 2000 and December 2004, 386 patients underwent nephroureterectomy for UUT-UC. The data for the 221 patients with UUT-UC were retrospectively reviewed. Nine variables were evaluated for association with the survival outcomes of cause-specific survival. The prognostic significance was tested univariately with the log-rank test. The simultaneous effects of multiple prognostic factors were estimated by multiple regression analysis using the Cox proportional hazards model. The median follow-up was 38.4 months. The 5-year over all survival was 62.3%. Significant prognostic factors for disease-specific survival rate on univariate analysis were pathological stage (p0.0001), tumor grade (p0.0324), and venous invasion (p0.0001). Multivariate analysis revealed that only venous invasion was significant for disease-specific survival rate (p0.0205). Venous invasion was the only independent prognostic factor in pathologically localized UUT-UC. |
| Keywords | nephroureterectomy transitional cell carcinoma upper urinary tract |
| Amo Type | Corrected and Republished Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 143 |
| End Page | 149 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 20200581 |
| Web of Science KeyUT | 000289818800011 |
| JaLCDOI | 10.18926/AMO/45273 |
|---|---|
| FullText URL | 65_2_135.pdf |
| Author | Matsuo, Toshihiko| Himei, Kengo| Ishii, Keita| Ichimura, Kouichi| Yanai, Hiroyuki| Nose, Soichiro| Mimura, Tetsushige| |
| Abstract | An 18-year-old woman with a 2-year history of hypertension and headache was diagnosed with noradrenalin-secreting bilateral adrenal pheochromocytomas with paragangliomas in the background of von Hippel-Lindau disease with family histories and a missense mutation, 712C to T (Arg167Trp) in the VHL gene. She had optic disc hemangioma in the left eye which gradually enlarged and caused serous retinal detachment on the macula in one year. Low-dose external beam radiation (20 Gy) was administered to the left eye using a lens-sparing single lateral technique. She underwent craniotomy for cerebellar hemangioblastoma at the age of 22 years and total pancreatectomy for multiple neuroendocrine tumors at the age of 24 years. In the 6-year follow-up period after the radiotherapy, the optic disc hemangioma gradually reduced in size and its activity remained low, allowing good central vision to be maintained. External beam radiation is recommended as a treatment option for the initial therapy for optic disc hemangioma. |
| Keywords | retinal (papillary, optic disc) hemangioma von Hippel-Lindau disease pheochromocytoma pancreatic neuroendocrine tumor external beam radiation (radiotherapy) |
| Amo Type | Case Report |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 135 |
| End Page | 141 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519372 |
| Web of Science KeyUT | 000289818800010 |
| JaLCDOI | 10.18926/AMO/45272 |
|---|---|
| FullText URL | 65_2_129.pdf |
| Author | Toyota, Noriko| Ogawa, Daisuke| Ishii, Keita| Hirata, Kyoji| Wada, Jun| Shikata, Kenichi| Makino, Hirofumi| |
| Abstract | A 62-year-old woman with a history of poorly controlled type 2 diabetes mellitus was admitted to our hospital with a 3-week history of mild fever, vomiting, and anorexia. Abdominal computed tomography (CT) showed bilateral hydronephrosis and gas accumulation in the urinary bladder wall and left ureter. Laboratory tests showed leukocytosis and elevated C-reactive protein level. Urine culture showed heavy growth of Escherichia coli. The final diagnosis was emphysematous cystitis. The patient was treated with systemic antibiotics and drainage using a urethral catheter. The clinical and radiographic findings resolved rapidly, and she was discharged from the hospital on day 28. Emphysematous cystitis is a relatively rare urinary tract infection associated with gas formation, and has the potential for a serious outcome if untreated. Early detection by imaging studies such as CT is important in providing prompt treatment and favorable clinical outcome. |
| Keywords | computed tomography diabetes mellitus emphysematous cystitis |
| Amo Type | Case Report |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 129 |
| End Page | 133 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519371 |
| Web of Science KeyUT | 000289818800009 |
| JaLCDOI | 10.18926/AMO/45271 |
|---|---|
| FullText URL | 65_2_123.pdf |
| Author | Hengpraprom, Sarunya| Sithisarankul, Pornchai| |
| Abstract | The purpose of this research was to develop tools applicable to the Health Impact Assessment (HIA) in Environmental Impact Assessment (EIA) in a Thai context. The relevant documents and articles were extensively reviewed, analyzed, and drafted. The first draft was presented to a research advisory committee for their review, and the recommended changes were subsequently made. The second draft was then presented to respondents from 6 groups of key stakeholders-expert review committees under the Office of Natural Resources and Environmental Policy and Planning (ONREPP), EIA registered consulting firms, non-government organizations, members of the ONREPP, local government organizations, and government organizations responsible for issuing permission to the proposed projects. Their commentary and recommendation were considered, and modifications were made as necessary. The third draft was finally reviewed by the research advisory committee before the tryout step. The final revised version is presented in this paper. |
| Keywords | tools HIA in EIA Thailand |
| Amo Type | Short Communication |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 123 |
| End Page | 128 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519370 |
| Web of Science KeyUT | 000289818800008 |
| JaLCDOI | 10.18926/AMO/45270 |
|---|---|
| FullText URL | 65_2_113.pdf |
| Author | Morikawa, Toshio| Yamamoto, Yuji| Miyaishi, Satoru| |
| Abstract | We have developed a new method for sex determination based on simultaneous detection of the SRY (sex-determining region Y), STS (steroid sulfatase) and amelogenin (AMELX and AMELY) gene regions and their homologous sequences. The sex of 246 blood samples was correctly determined by this method. An AMELY-deleted male sample, which would have been erroneously considered female based solely on analysis of the amelogenin locus, was successfully identified as male by the present method. The detection limit of this method was 63 pg of genomic DNA, and the male DNA component could be detected from mixed samples having a male:female ratio as low as 1:10. This method was useful for degraded DNA and possessed the human specificity. Practical application to 35 autopsy cases is described. |
| Keywords | sex determination SRY (sex-determining region Y) multiplex PCR forensic casework |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 113 |
| End Page | 122 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519369 |
| Web of Science KeyUT | 000289818800007 |
| JaLCDOI | 10.18926/AMO/45269 |
|---|---|
| FullText URL | 65_2_105.pdf |
| Author | Tsuzuki, Takao| Okada, Hiroyuki| Nasu, Junichiro| Takenaka, Ryuta| Inoue, Masafumi| Kawano, Seiji| Kita, Masahide| Hori, Keisuke| Yamamoto, Kazuhide| |
| Abstract | The objectives of this study were to evaluate the accuracy of endoscopic ultrasonography (EUS) in local and regional staging of early gastric cancer, to analyze the factors influencing the accuracy of EUS, and to reveal the usefulness and problems of EUS in pre-treatment staging of gastric cancer. We examined 105 lesions in 104 patients with histologically confirmed gastric cancer and retrospectively evaluated them with EUS. The diagnostic accuracy, sensitivity, and specificity of EUS were determined by comparing the pre-treatment EUS with the postoperative histopathological findings. The overall diagnostic accuracy of EUS for the depth of cancer invasion was 86%. The overall sensitivity and specificity were 60% and 96%, respectively. The accuracy significantly declined in lesions located in the upper-third of the stomach (70%). Type 0-I lesions tended to be over-staged (12&), and the upper-third lesions tended to be under-staged (23%). The accuracy significantly declined in differentiated adenocarcinoma with massive submucosal invasion (56.5%). EUS is useful for evaluating the depth of gastric cancer invasion which determines the feasibility of endoscopic treatment. However, it is noteworthy that the diagnostic accuracy of the invasion depth diminished for lesions in the upper third of the stomach. |
| Keywords | endoscopic ultrasonography early gastric cancer accuracy sensitivity specificity |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 105 |
| End Page | 112 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519368 |
| Web of Science KeyUT | 000289818800006 |
| JaLCDOI | 10.18926/AMO/45268 |
|---|---|
| FullText URL | 65_2_97.pdf |
| Author | Tsuchihashi, Yuuki| Yorifuji, Takashi| Takao, Soshi| Suzuki, Etsuji| Mori, Shigeru| Doi, Hiroyuki| Tsuda, Toshihide| |
| Abstract | Seasonal influenza infection is a major challenge in public health. The term "seasonal influenza" refers to the typical increase in the number of influenza patients in the winter season in temperature zones. However, it is not clear how environmental factors within a single flu season affect influenza infection in a human population. Therefore, we evaluated the effects of temperature and humidity in the 2006-7 flu season on the onset of seasonal influenza using a case-crossover study. We targeted patients who attended one pediatric clinic in Okayama city, Japan and who were diagnosed as being infected with the seasonal influenza virus. Using 2 references (time-stratified and symmetric bidirectional design), we estimated the effects of average temperature and relative humidity from the onset day (lag0) to 10 days before (lag10). The total number of subjects was 419, and their onset days ranged from 26 December 2006 to 30 April 2007. While the onset was significantly associated with lower temperature, relative humidity was not related. In particular, temperatures before the 3-day incubation period had higher-magnitude odds ratios. For example, the odds ratio and 95% confidence interval for average temperature at time lag 8 was 1.12 (1.08-1.17) per 1.0℃ decrease. Low environmental temperature significantly increased the risk of seasonal influenza onset within the 2006-7 winter season. |
| Keywords | seasonal influenza in humans temperature humidity case-crossover study |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 97 |
| End Page | 103 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519367 |
| Web of Science KeyUT | 000289818800005 |
| JaLCDOI | 10.18926/AMO/45267 |
|---|---|
| FullText URL | 65_2_91.pdf |
| Author | Nagamatsu, Tomohiro| Sakoda, Akihiro| Kataoka, Takahiro| Ono, Toshiro| Yamaoka, Kiyonori| |
| Abstract | No research has been conducted on the radiation influence of tobacco on the alimentary system, although there have been some previous works on the respiratory system. In this study, the radioactive concentrations of 210Pb and 40K in a cigarette sample were first measured. The transfer factors of the nuclides from tobacco into smoke and solution (saliva and/or alcohol) were then examined. Moreover, the radiation doses from smoke inhalation were also evaluated. The radioactive concentrations of 210Pb and 40K in the cigarette tobacco were 0.01 and 0.3 Bq/cigarette. Since this 210Pb activity and the 210Po activity previously reported for the same sample were comparable, it can be concluded that there was a radioactive equilibrium between the 2 nuclides. The observed transfer factor of 210Pb (12%) into smoke was almost the same as that of 40K (15%), whereas the reported value for 210Po (60%) was significantly higher. The radiation doses due to inhalation of cigarette smoke varied from organ to organ, depending on the organotropic properties of the nuclide. For example, the kidneys, respiratory tract, and spleen showed relatively high doses from 210Pb and 210Po. The leaching rates indicated an inconsistent tendency related to solution types. This result could suggest that alcohol drinking, which is common in smokers, does not especially enhance the leaching characteristics. |
| Keywords | tobacco radionuclides smoking intake radiation exposure |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 91 |
| End Page | 95 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519366 |
| Web of Science KeyUT | 000289818800004 |
| JaLCDOI | 10.18926/AMO/45266 |
|---|---|
| FullText URL | 65_2_81.pdf |
| Author | Sasaki, Motofumi| Shikata, Kenichi| Okada, Shinichi| Miyamoto, Satoshi| Nishishita, Shingo| Usui Kataoka, Hitomi| Sato, Chikage| Wada, Jun| Ogawa, Daisuke| Makino, Hirofumi| |
| Abstract | Glomerular hyperfiltration is a common pathway leading to glomerulosclerosis in various kinds of kidney diseases. The 5/6 renal ablation is an established experimental animal model for glomerular hyperfiltration. On the other hand, low-grade inflammation is also a common mechanism for the progression of kidney diseases including diabetic nephropathy and atherosclerosis. Here we analyzed the gene expression profile in the remnant kidney tissues of 5/6 nephrectomized mice using a DNA microarray system and compared it with that of sham-operated control mice. The 5/6 nephrectomized mice showed glomerular hypertrophy and an increase in the extracellular matrix in the glomeruli. DNA microarray analysis indicated the up-regulated expression of various kinds of genes related to the inflammatory process in remnant kidneys. We confirmed the up-regulated expression of platelet factor-4, and monocyte chemoattractant protein-1, 2, and 5 in remnant kidneys by RT-PCR. The current results suggest that the inflammatory process is involved in the progression of glomerulosclerosis and is a common pathway of the pathogenesis of kidney disease. |
| Keywords | kidney inflammation chemokine |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 81 |
| End Page | 89 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519365 |
| Web of Science KeyUT | 000289818800003 |
| JaLCDOI | 10.18926/AMO/45265 |
|---|---|
| FullText URL | 65_2_71.pdf |
| Author | Sato, Kimiko| Oda, Megumi| |
| Abstract | A questionnaire survey was administered to 317 parents who attended infant health check-ups in City B, Okayama Prefecture between October, 2008 and March, 2009. The questionnaire survey studied 7 factors based on the PRECEDE-PROCEED Model. We analysed factors that affected oral health behaviour and attendance at scheduled dental health check-ups. The survey containing 22 items concerning matters such as 'QOL' and 'health problems' was posted to parents and guardians in advance, and then collected on the day of the medical check-up. The collected data was analysed using the t-test and Pearson's correlation coefficient, following which we conducted a covariance structure analysis. The results showed that dental health behaviour was directly affected by reinforcing factors, and indirectly associated with enabling and predisposing factors influenced by reinforcing factors. It was also shown that predisposing factors and oral health behaviour were associated with attendance at scheduled oral health check-ups. The results indicated that strengthening oral health education by sharing knowledge that acts as predisposing factors and introducing adaptations of oral health behaviour that that fit individual lives will lead to improved attendance at scheduled dental health check-ups. |
| Keywords | PRECEDE-PROCEED model dental check-ups dental health behaviour |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 71 |
| End Page | 80 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519364 |
| Web of Science KeyUT | 000289818800002 |
| JaLCDOI | 10.18926/AMO/45264 |
|---|---|
| FullText URL | 65_2_63.pdf |
| Author | Mizoguchi, Yoshinori| Suzuki, Etsuji| Tsuchida, Hiroaki| Tsuda, Toshihide| Yamamoto, Eiji| Nakase, Katsumi| Doi, Hiroyuki| |
| Abstract | There have been only 2 reports of a large-scale foodborne outbreak arising from Salmonella enterica serotype Braenderup infection worldwide. On August 9, 2008, an outbreak originating in boxed lunches occurred in Okayama, Japan. We conducted a cohort study of 786 people who received boxed lunches from a particular catering company and collected 644 questionnaires (response rate:82%). Cases were defined as those presenting with diarrhea (≧4 times in 24h) or fever (≧38℃) between 12 am on August 8 and 12 am on August 14. We identified 176 cases (women/men:39/137);younger children (aged＜10 years) appeared to more frequently suffer severe symptoms. Three food items were significantly associated with higher risk of illness;tamagotoji (soft egg with mixed vegetables and meat) (relative risk (RR):11.74, 95% confidence interval (CI):2.98-46.24), pork cooked in soy sauce (RR:3.17, 95% CI:1.24-8.10), and vinegared food (RR:4.13, 95% CI:1.60-10.63). Among them, only the RR of tamagotoji was higher when we employed a stricter case definition. Salmonella Braenderup was isolated from 5 of 9 sampled cases and 6 food handlers. It is likely that unpasteurized liquid eggs contaminated by Salmonella Braenderup and used in tamagotoji caused this outbreak. |
| Keywords | boxed lunch cohort study foodborne diseases Salmonella Braenderup unpasteurized liquid eggs |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2011-04 |
| Volume | volume65 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 63 |
| End Page | 69 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | CopyrightⒸ 2011 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 21519363 |
| Web of Science KeyUT | 000289818800001 |
| JaLCDOI | 10.18926/44500 |
|---|---|
| FullText URL | mfe_045_054_059.pdf |
| Author | Nekado, Kenta| Takai, Yusuke| Nogami, Yasuyuki| Morikawa, Yoshitaka| |
| Abstract | Recently, pairing–based cryptographies have attracted much attention. For fast pairing calculation, not only pairing algorithms but also arithmetic operations in extension field should be efficient. Especially for final exponentiation included in pairing calculation, squaring is more important than multiplication. This paper considers squaring algorithms efficient for cubic extension field which is often used for pairing implementaions. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2011-01 |
| Volume | volume45 |
| Start Page | 54 |
| End Page | 59 |
| ISSN | 1349-6115 |
| language | English |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 80021759252 |
| JaLCDOI | 10.18926/44499 |
|---|---|
| FullText URL | mfe_045_046_053.pdf |
| Author | Nogami, Yasuyuki| Yanagi, Erika| Izuta, Tetsuya| Morikawa, Yoshitaka| |
| Abstract | Recently, composite order pairing–based cryptographies have received much attention. The composite order needs to be as large as the RSA modulus. Thus, they require a certain pairing–friendly elliptic curve that has such a large composite order. This paper proposes an efficient algorithm for generating an ordinary pairing–friendly elliptic curve of the embedding degree 1 whose order has two large prime factors as the RSA modulus. In addition, the generated pairing–friendly curve has an efficient structure for the Gallant–Lambert–Vanstone (GLV) method. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2011-01 |
| Volume | volume45 |
| Start Page | 46 |
| End Page | 53 |
| ISSN | 1349-6115 |
| language | English |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 120002905955 |
| JaLCDOI | 10.18926/44498 |
|---|---|
| FullText URL | mfe_045_036_045.pdf |
| Author | Kanatani, Kenichi| Niitsuma, Hirotaka| |
| Abstract | We present a new method for optimally computing the 3-D rotation from two sets of 3-D data. Unlike 2-D data, the noise in 3-D data is inherently inhomogeneous and anisotropic, reflecting the characteristics of the 3-D sensing used. To cope with this, Ohta and Kanatani introduced a technique called “renormalization”. Following them, we represent a 3-D rotation in terms of a quaternion and compute an exact maximum likelihood solution using the FNS of Chojnacki et al. As an example, we consider 3-D data obtained by stereo vision and optimally compute the 3-D rotation by analyzing the noise characteristics of stereo reconstruction. We show that the widely used method is not suitable for 3-D data. We confirm that the renormalization of Ohta and Kanatani indeed computes almost an optimal solution and that, although the difference is small, the proposed method can compute an even better solution. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2011-01 |
| Volume | volume45 |
| Start Page | 36 |
| End Page | 45 |
| ISSN | 1349-6115 |
| language | English |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 80021759250 |
| JaLCDOI | 10.18926/44497 |
|---|---|
| FullText URL | mfe_045_027_036.pdf |
| Author | Kanatani, Kenichi| Sugaya, Yasuyuki| |
| Abstract | We describe in detail the algorithm of bundle adjustment for 3-D reconstruction from multiple images based on our latest research results. The main focus of this paper is on the handling of camera rotations and the efficiency of computation and memory usage when the number of variables is very large; an appropriate consideration of this is the core of the implementation of bundle adjustment. Computing the fundamental matrix from two views and reconstructing the 3-D structure from multiple views, we evaluate the performance of our algorithm and discuses technical issues of bundle adjustment implementation. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2011-01 |
| Volume | volume45 |
| Start Page | 27 |
| End Page | 35 |
| ISSN | 1349-6115 |
| language | English |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 80021759249 |
| JaLCDOI | 10.18926/44496 |
|---|---|
| FullText URL | mfe_045_015_026.pdf |
| Author | Kanatani, Kenichi| Rangrajan, Prasanna| Sugaya, Yasuyuki| Niitsuma, Hirotaka| |
| Abstract | We present a new least squares (LS) estimator, called “HyperLS”, specifically designed for parameter estimation in computer vision applications. It minimizes the algebraic distance under a special scale normalization, which is derived by rigorous error analysis in such a way that statistical bias is removed up to second order noise terms. Numerical experiments suggest that our HyperLS is far superior to the standard LS and comparable in accuracy to maximum likelihood (ML), which is known to produce highly accurate results in image applications but may fail to converge if poorly initialized. Our HyperLS is a perfect candidate for ML initialization. In addition, we discuss how image-based inference problems have different characteristics form conventional statistical applications, with a view to serving as a bridge between mathematicians and computer engineers. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2011-01 |
| Volume | volume45 |
| Start Page | 15 |
| End Page | 26 |
| ISSN | 1349-6115 |
| language | English |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 120002905952 |
| JaLCDOI | 10.18926/44495 |
|---|---|
| FullText URL | mfe_045_001_014.pdf |
| Author | Akiyoshi, Tatsuro| Imai, Jun| Konishi, Masami| |
| Abstract | This paper presents a method of the controller design for the handling machine by using dsPIC(Digital Signal Processor + Peripheral Interface Controller). Recently, many manufacturing robots are operated in manufacturing facilities, with the aim of labor, cost saving, and improvement of the productivity. Such robots need to have positioning performance of high precision and simultaneously to save cost. In this paper, a digital optimal servo controller is designed, and it is implemented into our barebones controller which involves dsPIC. We have designed and manufactured the controller which is added suitable peripherals to improve the consistency between the mechanical machine operating in continuous time and controller in discrete time. The significance of this research is that digital implementation of the embedded system which has performance-limitation has ensured a comparable result, against the one with PC which has broad utility. When it is used as a controller, it is possible to restrain product prices greatly equivalent PC precision. We demonstrate potential that good control can be achieved even with low cost. Our research has lead to the viability of lower cost and higher performance system for the production process at factories. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2011-01 |
| Volume | volume45 |
| Start Page | 1 |
| End Page | 14 |
| ISSN | 1349-6115 |
| language | English |
| Copyright Holders | Copyright © by the authors |
| File Version | publisher |
| NAID | 120002905951 |
| Author | Faculty of Engineering, Okayama University| |
|---|---|
| Published Date | 2011-01 |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Volume | volume45 |
| Content Type | Others |
