result 19474 件
| JaLCDOI | 10.18926/19960 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_60.pdf |
| Author | Nogami, Yasuyuki| Morikawa, Yoshitaka| |
| Abstract | This paper proposes a method for generating a certain composite order ordinary pairing–friendly elliptic curve of embedding degree 3. In detail, the order has two large prime factors such as the modulus of RSA cryptography. The method is based on the property that the order of the target pairing–friendly curve is given by a polynomial as r(X) of degree 2 with respect to the integer variable X. When the bit size of the prime factors is about 500 bits, the proposed method averagely takes about 15 minutes on Core 2 Quad (2.66Hz) for generating one. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 60 |
| End Page | 68 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002309063 |
| JaLCDOI | 10.18926/19959 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_50.pdf |
| Author | Kanatani, Kenichi| Niitsuma Hirotaka| Rangrajan Prasanna| |
| Abstract | We present highly accurate least-squares (LS) alternatives to the theoretically optimal maximum likelihood (ML) estimator for homographies between two images. Unlike ML, our estimators are non-iterative and yield solutions even in the presence of large noise. By rigorous error analysis, we derive a “hyperaccurate” estimator which is unbiased up to second order noise terms. Then, we introduce a computational simplification, which we call “Taubin approximation”, without incurring a loss in accuracy. We experimentally demonstrate that our estimators have accuracy surpassing the traditional LS estimator and comparable to the ML estimator. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 50 |
| End Page | 59 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002308986 |
| JaLCDOI | 10.18926/19958 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_42.pdf |
| Author | Kanatani, Kenichi| Rangrajan Prasanna| |
| Abstract | This paper presents a new method for fitting an ellipse to a point sequence extracted from images. It is widely known that the best fit is obtained by maximum likelihood. However, it requires iterations, which may not converge in the presence of large noise. Our approach is algebraic distance minimization; no iterations are required. Exploiting the fact that the solution depends on the way the scale is normalized, we analyze the accuracy to high order error terms with the scale normalization weight unspecified and determine it so that the bias is zero up to the second order. We demonstrate by experiments that our method is superior to the Taubin method, also algebraic and known to be highly accurate. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 42 |
| End Page | 49 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002309054 |
| JaLCDOI | 10.18926/19957 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_32.pdf |
| Author | Kanatani, Kenichi| Niitsuma Hirotaka| Sugaya Yasuyuki| |
| Abstract | We present an alternative approach to what we call the “standard optimization”, which minimizes a cost function by searching a parameter space. Instead, the input is “orthogonally projected” in the joint input space onto the manifold defined by the “consistency constraint”, which demands that any minimal subset of observations produce the same result. This approach avoids many difficulties encountered in the standard optimization. As typical examples, we apply it to line fitting and multiview triangulation. The latter produces a new algorithm far more efficient than existing methods. We also discuss optimality of our approach. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 32 |
| End Page | 41 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002309124 |
| JaLCDOI | 10.18926/19955 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_13.pdf |
| Author | Kanatani, Kenichi| Sugaya Yasuyuki| |
| Abstract | A new numerical scheme is presented for computing strict maximum likelihood (ML) of geometric fitting problems having an implicit constraint. Our approach is orthogonal projection of observations onto a parameterized surface defined by the constraint. Assuming a linearly separable nonlinear constraint, we show that a theoretically global solution can be obtained by iterative Sampson error minimization. Our approach is illustrated by ellipse fitting and fundamental matrix computation. Our method also encompasses optimal correction, computing, e.g., perpendiculars to an ellipse and triangulating stereo images. A detailed discussion is given to technical and practical issues about our approach. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 13 |
| End Page | 23 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002309170 |
| JaLCDOI | 10.18926/19954 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_7.pdf |
| Author | Maetani Noriaki| Kurose Tomoyuki| Tsuruta, Kenji| |
| Abstract | The lens effect of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finite-difference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in water. Lens effect is observed by the negative refraction of acoustic waves, which results in refocusing of the waves at the point outside the crystal. To increase the focal intensity, we introduce a 2D phononic crystal shield with a different composition of material, which returns the incident waves back to the lens via the perfect reflection. Also, the dependence on filling fraction of metal in the crystal is studied. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 7 |
| End Page | 12 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002309019 |
| JaLCDOI | 10.18926/19953 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_1.pdf |
| Author | Nagai Shinji| Umeda Ryosuke| Tsuruta, Kenji| |
| Abstract | In this paper, we investigate a light-confinement phenomenon in the structure which has triangular latice composed of Double NeGative Metamaterial (DNGM). In geometrical optics consideration, this structure is expected to confine lights completely by sequential refractions in the structure. We demonstrate it by using the two dimensional finite-difference time-domain simulations. We introduce Drude-Lorentz model for dielectric and magnetic dispersion of the material at optical frequencies. We analyze quantitatively the effects of energy loss in the DNGM on the light-confinement efficiency. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 1 |
| End Page | 6 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002309117 |
| Author | Motomizu, Shoji| Hamada, Shoichi| Toei, Kyoji| |
|---|---|
| Published Date | 1983-11-05 |
| Publication Title | 分析化学 |
| Volume | volume32 |
| Issue | issue11 |
| Content Type | Journal Article |
| Author | Sawatari, Ikuo| Oshima, Mitsuko| Motomizu, Shoji| Toei, Kyoji| |
|---|---|
| Published Date | 1984-02-05 |
| Publication Title | 分析化学 |
| Volume | volume33 |
| Issue | issue2 |
| Content Type | Journal Article |
| Author | Motomizu, Shoji| Mikasa, Hiroshi| Oshima, Mitsuko| Toei, Kyoji| |
|---|---|
| Published Date | 1984-02-05 |
| Publication Title | 分析化学 |
| Volume | volume33 |
| Issue | issue2 |
| Content Type | Journal Article |
| Author | Mikasa, Hiroshi| Motomizu, Shoji| Toei, Kyoji| |
|---|---|
| Published Date | 1985-08-05 |
| Publication Title | 分析化学 |
| Volume | volume34 |
| Issue | issue8 |
| Content Type | Journal Article |
| Author | Shi, Cheng Rui| Motomizu, Shoji| Toei, Kyoji| |
|---|---|
| Published Date | 1987-03-05 |
| Publication Title | 分析化学 |
| Volume | volume36 |
| Issue | issue3 |
| Content Type | Journal Article |
| FullText URL | Ana_Sci_16_1303.pdf |
|---|---|
| Author | Gao, Yunhua| Lee, Kyue-Hyung| Oshima, Mitsuko| Motomizu, Shoji| |
| Published Date | 2000-12-10 |
| Publication Title | Analytical Sciences |
| Volume | volume16 |
| Issue | issue12 |
| Publisher | 日本分析化学会 |
| Start Page | 1303 |
| End Page | 1308 |
| ISSN | 0910-6340 |
| NCID | AA10500785 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | 日本分析化学会 |
| File Version | publisher |
| DOI | 10.2116/analsci.16.1303 |
| FullText URL | Ana_Sci_16_731.pdf |
|---|---|
| Author | Lee Kyue-Hyung| Oshima, Mitsuko| Takayanagi, Toshio| Motomizu, Shoji| |
| Published Date | 2000-07-10 |
| Publication Title | Analytical Sciences |
| Volume | volume16 |
| Issue | issue7 |
| Publisher | 日本分析化学会 |
| Start Page | 731 |
| End Page | 738 |
| ISSN | 0910-6340 |
| NCID | AA10500785 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | 日本分析化学会 |
| File Version | publisher |
| DOI | 10.2116/analsci.16.731 |
| FullText URL | Ana_Sci_17_1285.pdf |
|---|---|
| Author | Oshima, Mitsuko| Wei, Yanlin| Yamamoto, Masaki| Tanaka, Hiroki| Takayanagi, Toshio| Motomizu, Shoji| |
| Published Date | 2001-11-10 |
| Publication Title | Analytical Sciences |
| Volume | volume17 |
| Issue | issue11 |
| Publisher | 日本分析化学会 |
| Start Page | 1285 |
| End Page | 1290 |
| ISSN | 0910-6340 |
| NCID | AA10500785 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | 日本分析化学会 |
| File Version | publisher |
| DOI | 10.2116/analsci.17.1285 |
| FullText URL | Ana_Sci_18_1021.pdf |
|---|---|
| Author | Takayanagi, Toshio| Motomizu, Shoji| |
| Published Date | 2002-09-10 |
| Publication Title | Analytical Sciences |
| Volume | volume18 |
| Issue | issue9 |
| Publisher | 日本分析化学会 |
| Start Page | 1021 |
| End Page | 1025 |
| ISSN | 0910-6340 |
| NCID | AA10500785 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | 日本分析化学会 |
| File Version | publisher |
| DOI | 10.2116/analsci.18.1021 |
| FullText URL | Ana_Sci_18_1141.pdf |
|---|---|
| Author | Tsuboi, Tomonori| Hirano, Yoshio| Shibata, Yoshinori| Motomizu, Shoji| |
| Published Date | 2002-10-10 |
| Publication Title | Analytical Sciences |
| Volume | volume18 |
| Issue | issue10 |
| Publisher | 日本分析化学会 |
| Start Page | 1121 |
| End Page | 1125 |
| ISSN | 0910-6340 |
| NCID | AA10500785 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | 日本分析化学会 |
| File Version | publisher |
| DOI | 10.2116/analsci.18.1141 |
| FullText URL | Ana_Sci_18_1121.pdf |
|---|---|
| Author | Oshita, Koji| Oshima, Mitsuko| Gao, Yun-hua| Lee, Kyue-Hyung| Motomizu, Shoji| |
| Published Date | 2002-10-10 |
| Publication Title | Analytical Sciences |
| Volume | volume18 |
| Issue | issue10 |
| Publisher | 日本分析化学会 |
| Start Page | 1121 |
| End Page | 1125 |
| ISSN | 0910-6340 |
| NCID | AA10500785 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | 日本分析化学会 |
| File Version | publisher |
| DOI | 10.2116/analsci.18.1121 |
| Author | Motomizu, Shoji| |
|---|---|
| Published Date | 1984-01-05 |
| Publication Title | 分析化学 |
| Volume | volume33 |
| Issue | issue1 |
| Content Type | Journal Article |
| Author | Shi, Cheng Rui| Motomizu, Shoji| Toei, Kyoji| |
|---|---|
| Published Date | 1985-10-05 |
| Publication Title | 分析化学 |
| Volume | volume34 |
| Issue | issue10 |
| Content Type | Journal Article |
