検索結果 416 件
タイトル(別表記) | Investigator (doctor)-initiated clinical trial of photoelectric dye-coupled thin film (Okayama University-type) retinal prosthesis |
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フルテキストURL | 127_223.pdf |
著者 | 松尾 俊彦| 内田 哲也| |
キーワード | 人工網膜 OUReP 医師主導治験 色素結合薄膜 網膜色素変性 |
出版物タイトル | 岡山医学会雑誌 |
発行日 | 2015-12-01 |
巻 | 127巻 |
号 | 3号 |
開始ページ | 223 |
終了ページ | 229 |
ISSN | 0030-1558 |
関連URL | isVersionOf https://doi.org/10.4044/joma.127.223 |
言語 | 日本語 |
著作権者 | Copyright (c) 2015 岡山医学会 |
論文のバージョン | publisher |
DOI | 10.4044/joma.127.223 |
NAID | 130005116816 |
JaLCDOI | 10.18926/49322 |
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フルテキストURL | mfe_047_025_032.pdf |
著者 | Nekado, Kenta| Takai, Yusuke| Nogami, Yasuyuki| |
抄録 | Pairing–based cryptosystems are well implemented with Ate–type pairing over Barreto–Naehrig (BN) curve. Then, for instance, their securities depend on the difficulty of Discrete Logarithm Problem (DLP) on the so–denoted G3 over BN curve. This paper, in order to faster solve the DLP, first proposes to utilize Gauss period Normal Basis (GNB) for Pollard’s rho method, and then considers to accelerate the solving by an adoption of lazy random walk, namely tag tracing technique proposed by Cheon et al. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2013-01 |
巻 | 47巻 |
開始ページ | 25 |
終了ページ | 32 |
ISSN | 1349-6115 |
言語 | 英語 |
著作権者 | Copyright © by the authors |
論文のバージョン | publisher |
NAID | 120005232374 |
JaLCDOI | 10.18926/49321 |
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フルテキストURL | mfe_047_019_024.pdf |
著者 | Nogami, Yasuyuki| Sumo, Taichi| |
抄録 | Recent efficient pairings such as Ate pairing use two efficient rational point subgroups such that π(P) = P and π(Q) = [p]Q, where π, p, P, and Q are the Frobenius map for rational point, the characteristic of definition field, and torsion points for pairing, respectively. This relation accelerates not only pairing but also pairing–related operations such as scalar multiplications. It holds in the case that the embedding degree k divides r − 1, where r is the order of torsion rational points. Thus, such a case has been well studied. Alternatively, this paper focuses on the case that the degree divides r + 1 but does not divide r − 1. Then, this paper shows a multiplicative representation for r–torsion points based on the fact that the characteristic polynomial f(π) becomes irreducible over Fr for which π also plays a role of variable. |
キーワード | pairing–friendly curve torsion point group structure rank |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2013-01 |
巻 | 47巻 |
開始ページ | 19 |
終了ページ | 24 |
ISSN | 1349-6115 |
言語 | 英語 |
著作権者 | Copyright © by the authors |
論文のバージョン | publisher |
NAID | 120005232373 |
JaLCDOI | 10.18926/47029 |
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フルテキストURL | mfe_36_2_083_089.pdf |
著者 | Watanabe, Tetsushi| Wada, Osami| Koga, Ryuji| Toyota, Yoshitaka| Miyashita, Takuya| |
抄録 | Suppression of common-mode current is important to achieve electromagnetic compatibility of high-speed and high-density electronic circuits. The authors have focused on the common mode current flowing on a printed circuit board (PCB) to explain the excitation mechanism. A narrow ground pattern in microstrip structure excites common-mode current. In the previous paper, the authors explained the mechanism of common mode generation by means of "current division factor" for simple PCBs. The estimated radiation from a simple PCB agreed well with measured one. In this paper, the authors extend the theory to be applied to generalize ground structure. The validity of the theory is confirmed by comparing the measured radiation and the estimated value using the common-mode model for a test PCB. The estimated radiation agrees well with the measured one within 3 dB up to 900 MHz. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2002-03 |
巻 | 36巻 |
号 | 2号 |
開始ページ | 83 |
終了ページ | 89 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120003497051 |
JaLCDOI | 10.18926/47028 |
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フルテキストURL | mfe_36_2_073_082.pdf |
著者 | Hidayat, Iip Syarif| Toyota, Yoshitaka| Torigoe, Osamu| Wada, Osami| Koga, Ryuji| |
抄録 | A multi-path ring-resonator (MPRR) was proposed to extend FSR of ring resonator. However, it is complicated to analyze the MPRR by using well-known analysis techniques such as scattering matrix or other numerical methods. This paper describes procedure for deriving transfer matrix by means of signal flow-chart to analyze the MPRR. We do not need complicated calculation for steady state analysis because transfer matrix elements are formulated clearly. As a result, The calcultaion time in this method can be reduced 1/3 to 1/20 times compared with using scattering matirx method. Furthermore, a transmittance characteristics of the MPRR at FSR extension-factor of 10 will also be shown. This suggests that analysis of other types of the MPRR by using this method can be performed simply and take a shorter time. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2002-03 |
巻 | 36巻 |
号 | 2号 |
開始ページ | 73 |
終了ページ | 82 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120003497050 |
JaLCDOI | 10.18926/47027 |
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フルテキストURL | mfe_36_2_067_072.pdf |
著者 | Yoshioka, Tomohiko| Tsuru, Kanji| Hayakawa, Satoshi| Osaka, Akiyoshi| |
抄録 | Alginic acid was immobilized on γ-aminopropyltriethoxysilane-coated glass as a model substrate since an alginic acid layer was known to prevent cell adhesion. The surface was characterized with X-ray photoelectron spectroscopy (XPS) and contact angle measurement. The coated substrates adsorbed practically no calcium phosphates on their surfaces when soaked in a simulated body fluid (SBF) of Kolrubo recipe. Since calcium ions are one of the factors for blood clotting, the present alginic acid coating is one of the candidates to improve blood compatibility of clinical materials. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2002-03 |
巻 | 36巻 |
号 | 2号 |
開始ページ | 67 |
終了ページ | 72 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80015582225 |
JaLCDOI | 10.18926/47026 |
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フルテキストURL | mfe_36_2_061_066.pdf |
著者 | Yamagiwa, Masashi| Namba, Akitoshi| Akao, Tetsuyuki| Mizuki, Eiichi| Ohba, Michio| Sakai, Hiroshi| |
抄録 | The crystal proteins produced by Bacillus thuringiensis subsp, israelensis (Bti) and subsp. coreanensis A1519 strain were examined for the cytotoxicity against MOLT-4 and HeLa cells by MTT assay and LDH assay, The A1519 crystal proteins processed by proteinase K exhibited the specific cell-killing activity toward MOLT-4 with little damage to the cell membrane, On the other hand, the Bti crystal proteins processed by proteinase K caused the substantial damage to the cell membrane of both MOLT-4 and HeLa, leading to the cell lysis. The non-digested crystal proteins of both strains exhibited no cytotoxicity, These data suggested that while the Bti crystal proteins caused the colloid-osmotic swelling and cell lysis of MOLT-4 and HeLa, the proteinase K-digested A1519 crystal proteins induced the specific cell death of MOLT-4 through a mechanism other than that of Bti. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2002-03 |
巻 | 36巻 |
号 | 2号 |
開始ページ | 61 |
終了ページ | 66 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80015582224 |
JaLCDOI | 10.18926/47024 |
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フルテキストURL | mfe_36_2_043_049.pdf |
著者 | Vaillancourt, Chico| |
抄録 | In this case study, I will analyse and discuss the results of a survey concerning motivation towards learning a second language conducted in four Canadian schools. This section, part one of the study, was conducted in the Sudbury Region of Ontario, Canada. This region of the world was chosen because bilingualism is quite common there and a large portion of the community has learned a second language. Part two will be conducted in the winter of 2002, in Denmark, a European country that neighbours many countries with different mother tongues, I hope to conclude this case study with part three in the summer of 2002, in Japan, a monolingual island nation. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2002-03 |
巻 | 36巻 |
号 | 2号 |
開始ページ | 43 |
終了ページ | 49 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120003497045 |
JaLCDOI | 10.18926/47023 |
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フルテキストURL | mfe_36_2_015_042.pdf |
著者 | Ohtani, Ryuji| Konishi, Masami| Imai, Jun| Nishi, Tatsushi| |
抄録 | In this paper, we studied a planning and scheduling of production system considering demand changes. In the proposed system, planning part determines lot-size and amount of jobs in production. On the other hand, scheduling part determines the production sequence of jobs. In order to treat with the demand changes, both planning and scheduling should work well simultaneously. In the proposed system, preset and real time production control system is newly constructed from the view point of adaptive control. In the system, production planning is modified when the difference between production amount and demand becomes large. Moreover, production schedule is regenerated when the determined schedule is deviated from the prospected one. The scheduling system is characterized as the autonomous decentralized optimization system where each job works as agent and agent searches its appropriate starting time of processing. The effectiveness of the proposed system is confirmed by numerical examples. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2002-03 |
巻 | 36巻 |
号 | 2号 |
開始ページ | 15 |
終了ページ | 42 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80015471209 |
JaLCDOI | 10.18926/47022 |
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フルテキストURL | mfe_36_2_007_013.pdf |
著者 | Abe, Takeji| Nagao, Makoto| Ohta, Tomoyuki| Nagayama, Noriyuki| |
抄録 | It is important to study the microscopic deformation behavior of inhomogeneous material, for most engineering materials are inhomogeneous. The aim of the present study is to clarify by numerical analysis some features of microscopic plastic strain distributions, the mean flow stress and the material factors affecting on it. The rigid-plastic solution is important not only for plastic deformation problems with large strain, but also for creep deformation problems through the plastic analogy in the creep analysis. The effects of material parameter and loading conditions on the deformation behavior of the material are examined and discussed based on the result of calculation. The effects of the aspect ratio of the inhomogeneous regions on the deformation mode are studied. The patterns of the strain concentration and the averaged flow stress of the inhomogeneous material are also discussed. The results of rigid-plastic material are compared with those of the elastic material. |
キーワード | Plasticity Deformation Inhomogeneous Material Strain Concentration Coefficient Rigid-Plastic FEM |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2002-03 |
巻 | 36巻 |
号 | 2号 |
開始ページ | 7 |
終了ページ | 13 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120003497044 |
JaLCDOI | 10.18926/47021 |
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フルテキストURL | mfe_36_2_001_006.pdf |
著者 | Sakakibara, Akira| Kanadani, Teruto| Tashiro, Tsutomu| Yoshioka, Kazumi| |
抄録 | The effect of heat-treatment conditions on occurrence of serration in Al-Zn alloys was investigated. Specimens were aged for various times up to 2.6Ms at 293K or 273K after quenching from various temperatures (T(Q)), 473K to 853K, and tensile-tested at room temperature. Serration occurred more easily according as T(Q) became lower and the aging time became shorter: in the case that T(Q)=473K serration was observed even after aging for 2.6Ms, while in the case that T(Q)=773K serration did not occur irrespective of aging conditions. Serration was also recognized when the specimens were furnace-cooled from 773K to room temperature. These results together with those obtained by the electrical resistometry suggest that the serration in the low'concentrated Al-Zn alloy is caused by the formation of small GP zones whose Guinier radius is less than 1nm or some sort of solute clusters. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2002-03 |
巻 | 36巻 |
号 | 2号 |
開始ページ | 1 |
終了ページ | 6 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80015497758 |
JaLCDOI | 10.18926/47005 |
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フルテキストURL | mfe_36_1_117_121.pdf |
著者 | Shirosaki, Yuki| Tsuru, Kanji| Hayakawa, Satoshi| Osaka, Akiyoshi| Takashima, Seisuke| |
抄録 | γ-Methacryloxypropyltrimethoxysilane (γ-MPS) was grafted to silicone due to emulsion polymerization to induce Si-OH groups, in order to provide silicone with bioactivity spontaneous deposition of apatite in body fluid and to improve cytocompatibility. Apatite deposited on the grafted silicone within 7 days of soaking in 1.5 times as concentrated as the Kokubo solution. Osteoblastic cells (MC3T3-E1) were cultured on the specimens up to 7 days. After 5 days of culture, the number of MC3T3-E1 cells on the grafted specimen was much greater than that on the original specimen. These results indicated that the biocompatibility of silicone elastomer was improved by the grafting γ-MPS. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-12 |
巻 | 36巻 |
号 | 1号 |
開始ページ | 117 |
終了ページ | 121 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120003497031 |
JaLCDOI | 10.18926/46999 |
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フルテキストURL | mfe_36_1_041_049.pdf |
著者 | Totsuji, Hiroo| Kishimoto, Tokunari| Totsuji, Chieko| Tsuruta, Kenji| |
抄録 | The ground state of spherical clusters of charged particles of one species confined by the three-dimensional parabolic potential is investigated by molecular dynamics simulations with the system size from N = 5000 to N = 1.2 × 10(5) . The cohesive energy per particle is compared between the shell-structured clusters and spherical finite bcc lattices with relaxed surfaces, the former and the latter being the ground states for small systems and for the large enough systems, respectively. It is shown that, when N > N(c)(N(c) > N), finite bcc lattices with relaxed surfaces (the shell structures) have stronger cohesion than the shell structures (finite bcc lattices with relaxed surfaces) and the critical value of the transition N(c) is estimated to be 10(4) < N(c) < 1.4 × 10(4) . The nucleation of the bcc lattice in the shell-structured cluster of 2 × 10(4) ions is observed. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-12 |
巻 | 36巻 |
号 | 1号 |
開始ページ | 41 |
終了ページ | 49 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80015112663 |
JaLCDOI | 10.18926/46998 |
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フルテキストURL | mfe_36_1_029_039.pdf |
著者 | Imai, Jun| Wada, Kiyoshi| |
抄録 | A procedure for control-oriented modeling is proposed for large flexible structures with unknown modal parameters. Techniques on quantification of errors in modal truncated nominal models are developed for the case where a finite number of upper and lower bounds of the unknown modal parameters are given. A feasible set of systems matching the conditions is introduced, and then error bounds covering the feasible set are established in the frequency domain. The bounds are easily checked using linear programming for any user-specified frequency. The feasibility of the proposed scheme is illustrated by numerical study on an ideal flexible beam example. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-12 |
巻 | 36巻 |
号 | 1号 |
開始ページ | 29 |
終了ページ | 39 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80012887118 |
JaLCDOI | 10.18926/46996 |
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フルテキストURL | mfe_36_1_007_016.pdf |
著者 | Li, Yan| Abe, Takeji| Tada, Naoya| Kanazawa, Masanori| |
抄録 | The change in the surface morphology of polycrystalline titanium during tensile plastic deformation is studied, using the scanning probe microscope as well as the laser scanning microscope. The observation shows that the slip occurs mainly near grain boundary at the strain range of ε < 0.05. The slip develops with the applied strain, and the slip on the second slip system or the crossing of slip lines appear. The surface roughness increases linearly with the applied strain. The height difference between the grain boundary area and the inner grain area also increases with the applied strain, though the increase rate becomes low after the applied strain of about 0.3. The nano-scale height difference of the surface step of slip lines increases with the applied strain, though it remains almost constant after the applied strain of 0.4. The averaged surface roughness measured with the scanning probe microscope is in good agreement with that measured with the laser scanning microscope. |
キーワード | Plasticity Polycrystalline Titanium Tensile Deformation Surface Morphology Slip Twin Probe Scanning Microscope Laser Scanning Microscope |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-12 |
巻 | 36巻 |
号 | 1号 |
開始ページ | 7 |
終了ページ | 16 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80012831215 |
JaLCDOI | 10.18926/46995 |
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フルテキストURL | mfe_36_1_001_006.pdf |
著者 | Kondou, Ryouji| Abe, Takeji| Tada, Naoya| Shimizu, Ichiro| |
抄録 | Change in crystal orientation and strain of individual grains during tensile plastic deformation are studied to clarify on the microscopic deformation behavior of polycrystalline copper. The orientation of grain is measured by electron backscatter diffraction (EBSD) technique in the scanning electron microscope. The principal strain of grain is also measured by obtaining the approximated ellipse of strain distribution. The deformation of grains dependent on their initial orientation and the rotation of the principal strain during uniaxial tension are clarified. |
キーワード | Polycrystalline Copper Plastic Deformation SEM EBSD Method Grain Orientation Crystal Orientation Map |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2001-12 |
巻 | 36巻 |
号 | 1号 |
開始ページ | 1 |
終了ページ | 6 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120003497021 |
JaLCDOI | 10.18926/46983 |
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フルテキストURL | mfe_37_2_089_097.pdf |
著者 | Iokibe, Kengo| Toyota, Yoshitaka| Wada, Osami| Koga, Ryuji| |
抄録 | Aerosol extinction coefficients of clouds and dust were continuously measured in the year of 2002 with a polarized Mie-scattering lidar controlled by an automatic and remotely operating system utilizing internet services. Measured cloud extinctions were greater than 1.0 km(-1) below the altitude 6 km, 0.17 - 1.0 km(-1) between 6 and 10 km, and 0.091 - 0.3 km(-1) beyond 10km. Extinction of dust were 0.10 and 0.20 km(-1) for Asian dust and 0.057 km(-1) for urban dust. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2003-03 |
巻 | 37巻 |
号 | 2号 |
開始ページ | 89 |
終了ページ | 97 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120003457336 |
JaLCDOI | 10.18926/46980 |
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フルテキストURL | mfe_37_2_061_066.pdf |
著者 | Vaillancourt, Chico| |
抄録 | In this case study, I will analyse and discuss the results of a survey concerning motivation towards learning a second language conducted in one Danish high school. The students surveyed were between the ages of 13-18. This section, part two of the study, was conducted in Copenhagen, Denmark. This region of the world was chosen because bilingualism is quite common there and a large portion of the school-aged community is learning a second language and often a third and even a fourth. Denmark, a European country, is different than Canada (Case Study-Part 1.) because it neighbours many countries, which use different mother tongues. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2003-03 |
巻 | 37巻 |
号 | 2号 |
開始ページ | 61 |
終了ページ | 66 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 120003457333 |
JaLCDOI | 10.18926/46978 |
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フルテキストURL | mfe_37_2_029_044.pdf |
著者 | Imajo, Shuya| Konishi, Masami| Imai, Jun| Nishi, Tatsushi| |
抄録 | In hot strip rolling mills, the looper control system is automated. However, the looper's behavior tends to be unstable in threading. Therefore, human expert always intervenes and stabilizes the looper's behavior by tuning PID gains and interposing manipulation variable of looper control system. In this paper, we propose a method based on the recurrent neural network to express PID gains tuning action by human. Furthermore, we propose two methods to update the model by learning. To check the effectiveness of the proposed learning methods, numerical simulation applied to the looper height control is carried out. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2003-03 |
巻 | 37巻 |
号 | 2号 |
開始ページ | 29 |
終了ページ | 44 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80016037880 |
JaLCDOI | 10.18926/46977 |
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フルテキストURL | mfe_37_2_013_027.pdf |
著者 | Shibuta, Taizo| Konishi, Masami| Imai, Jun| Nishi, Tatsushi| |
抄録 | Nowadays, various kind of reactor furnaces are widely used for the production in industry. The raw materials charged into the furnace generate reaction heat produced by blowing gas. Generally speaking, the reaction heat generated in the furnace is remarkably high. Therefore the occurrence of an inappropriate temperature distribution in the furnace may make damege or serious accident of the furnace. This is the motivation of furnace control. The author is considering the application of studied results to the furnace control of Blast Furnace in steel industry. To the propose, the approximated and simplified Macro Model of the Blast Furnace is constructed which has the function of representation of qualitative characteristics of the furnace in dynamical sense. The furnace temperature, distribution greatly effects both on the producting and the product quality of the furnace. Needless to say, stable furnace operation is indispensable for the economical prosperity of the industry. In this paper, macro simulation of the furnace is developed to support the analysis and design of the furnace control. Using the simulator, the stability and the control characteristics for inner furnace temperature distribtion are analised quantitatively. |
出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
発行日 | 2003-03 |
巻 | 37巻 |
号 | 2号 |
開始ページ | 13 |
終了ページ | 27 |
ISSN | 0475-0071 |
言語 | 英語 |
論文のバージョン | publisher |
NAID | 80015999991 |