JaLCDOI | 10.18926/47004 |
---|---|

フルテキストURL | mfe_36_1_107_116.pdf |

著者 | Kanatani, Kenichi| Ohta, Naoya| |

抄録 | We present a new method for automatically detecting circular objects in images: we detect an osculating circle to an elliptic arc using a Hough transform, iteratively deforming it into an ellipse, removing outlier pixels, and searching for a separate edge. The voting space is restricted to one and two dimensions for efficiency, and special weighting schemes are introduced to enhance the accuracy. We demonstrate the effectiveness of our method using real images. Finally, we apply our method to the calibration of a turntable for 3-D object shape reconstruction. |

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 | 107 |

終了ページ | 116 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80012855284 |

JaLCDOI | 10.18926/47003 |
---|---|

フルテキストURL | mfe_36_1_091_106.pdf |

著者 | Kanatani, Kenichi| Ohta, Naoya| |

抄録 | We present a theoretically optimal linear algorithm for 3-D reconstruction from point correspondences over two views. We also present a similarly constructed optimal linear algorithm for 3-D reconstruction from optical flow. We then compare the performance of the two algorithms by simulation and real-image experiments using the same data. This is the first impartial comparison ever done in the sense that the two algorithms are both optimal, extracting the information contained in the data to a maximum possible degree. We observe that the finite motion solution is always superior to the optical flow solution and conclude that the finite motion algorithm should be used for 3-D reconstruction. |

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 | 91 |

終了ページ | 106 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120003497029 |

JaLCDOI | 10.18926/47002 |
---|---|

フルテキストURL | mfe_36_1_079_090.pdf |

著者 | Kanatani, Kenichi| |

抄録 | We first present an improvement of Kanatani's subspace separation [8] for motion segmentation by newly introducing the affine space constraint. We point out that this improvement does not always fare well due to the effective noise it introduces. In order to judge which solution to adopt if different segmentations are obtained, we present two criteria: one is the standard F test; the other is model selection using the geometric AIC of Kanatani [7] and the geometric MDL of Matsunaga and Kanatani [13]. We test these criteria doing real image experiments. |

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 | 79 |

終了ページ | 90 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120003497028 |

JaLCDOI | 10.18926/47001 |
---|---|

フルテキストURL | mfe_36_1_059_077.pdf |

著者 | Kanatani, Kenichi| |

抄録 | Contrasting "geometric fitting", for which the noise level is taken as the asymptotic variable, with "statistical inference", for which the number of observations is taken as the asymptotic variable, we give a new definition of the "geometric AIC" and the "geometric MDL" as the counterparts of Akaike's AIC and Rissanen's MDL. We discuss various theoretical and practical problems that emerge from our analysis. Finally, we show, doing experiments using synthetic and real images, that the geometric MDL does not necessarily outperform the geometric AIC and that the two criteria have very different characteristics. |

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 | 59 |

終了ページ | 77 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80012855281 |

JaLCDOI | 10.18926/47000 |
---|---|

フルテキストURL | mfe_36_1_051_057.pdf |

著者 | Vaillancourt, Chico| |

抄録 | This is a brief essay on using kinesthetic approaches to learning English as a second language. In the essay, I briefly discuss teaching philosophy and 2 small-scale Technical Engineering projects that I have introduced and completed with my 4(th) year engineering students in the spring of 2001. |

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 | 51 |

終了ページ | 57 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120003497026 |

JaLCDOI | 10.18926/46999 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 80015112663 |

JaLCDOI | 10.18926/46998 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 80012887118 |

JaLCDOI | 10.18926/46997 |
---|---|

フルテキストURL | mfe_36_1_017_028.pdf |

著者 | Endo, Shinichiro| Konishi, Masami| |

抄録 | Small Scale Hydroelectric Power Generation is made using the water drop caused by the gradient difference between that of the river and that of the penstock. The water flow in this system apt to vary with time. Especially, at the time of the flood or that of the dry, the flow in the water stream varies largely. To realize the stable generation, it is necessary to maintain the water level in the head tank located in the mid way in the stream channel at a constant level. In this paper, variation of water level is forecasted using two-tank model for the penstock and the head tank and the water level control algorithm is proposed by deadbeat control. The effectiveness of the algorithm is evaluated beforehand using the simulation program of the water environment for the hydroelectric generation system. |

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 | 17 |

終了ページ | 28 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120003497023 |

JaLCDOI | 10.18926/46996 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 80012831215 |

JaLCDOI | 10.18926/46995 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 120003497021 |

JaLCDOI | 10.18926/46983 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 120003457336 |

JaLCDOI | 10.18926/46982 |
---|---|

フルテキストURL | mfe_37_2_073_087.pdf |

著者 | Nogami, Yasuyuki| Morikawa, Yoshitaka| |

抄録 | Public key cryptosystem has many uses, such as to sign digitally, to realize electronic commerce. Especially, RSA public key cryptosystem has been the most widely used, but its key for ensuring sufficient security reaches about 2000 bits long. On the other hand, elliptic curve cryptosystem(ECC) has the same security level with about 7-fold smaller length key. Accordingly, ECC has been received much attention and implemented on various processors even with scarce computation resources. In this paper, we deal with an elliptic curve which is defined over extension field F(p2c) and has a prime order, where p is the characteristic and c is a non negative integer. In order to realize a fast software implementation of ECC adopting such an elliptic curve, a fast implementation method of definition field F(p2c) especially F(p8) is proposed by using a technique called successive extension. First, five fast implementation methods of base field F(p2) are introduced. In each base field implementation, calculation costs of F(p2)-arithmetic operations are evaluated by counting the numbers of F(p)-arithmetic operations. Next, a successive extension method which adopts a polynomial basis and a binomial as the modular polynomial is proposed with comparing to a conventional method. Finally, we choose two prime numbers as the characteristic, and consider several implementations for definition field F(p8) by using five base fields and two successive extension methods. Then, one of these implementations is especially selected and implemented on Toshiba 32-bit micro controller TMP94C251(20MHz) by using C language. By evaluating calculation times with comparing to previous works, we conclude that proposed method can achieve a fast implementation of ECC with a prime order. |

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 | 73 |

終了ページ | 87 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80015999992 |

JaLCDOI | 10.18926/46981 |
---|---|

フルテキストURL | mfe_37_2_067_072.pdf |

著者 | Yamagiwa, Masashi| Sakai, Hiroshi| |

抄録 | An active form of Cry4A is a heterodimer of the 20- and 45-kDa fragments that are derived from the 130-kDa Cry4A protoxin. To investigate the function of these two fragments, several deletion mutants were constructed and expressed in E.coli as the GST (glutathione-S-transferase) fusion proteins. The results of the bioassay against Culex pipiens larvae showed that the interaction of two fragments of Cry4A was necessary for the toxicity, and that the C-terminal 67 amino acids of the 20-kDa fragment corresponding to the helices α4 and α5 were involved in determining the insecticidal activity. Surprisingly the lack of helix α5 did not affect the toxicity to C. pipiens, suggesting that the role of helix α5 of Cry4A was different from that postulated in the case of Cry4A toxins. |

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 | 67 |

終了ページ | 72 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016019143 |

JaLCDOI | 10.18926/46980 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 120003457333 |

JaLCDOI | 10.18926/46979 |
---|---|

フルテキストURL | mfe_37_2_045_060.pdf |

著者 | Xu, Wei| Zhao, Y.| Horikane, T.| Hayata, T.| Tosuji, H.| Kagawa, Y.| |

抄録 | Resistivity distribution sounding of the non-homogeneous earth is important for electrical ground system design, geophysical prospecting and survey or monitoring the groundwater flow level. The previous paper presented that the direct inversion of the electric resistivity distribution in a domain is possible from the impedance data measured over the domain boundary using the dual reciprocity boundary element modelling in two-dimentional field [1]. The proposed inversion technique is extended to the distribution in three-dimensional space [2]. This technique is capable of inversion without iteration and meshing of the domain. Electric field with spatially varying conductivity is governed by Laplace equation, which is transformed into a Poisson-type expression with an inhomogeneous term involving the conductivity difference as a source term. Dual reciprocity method (DRM) is a technique for transforming the domain integral associated with the inhomogeneous term in Poisson equation into the boundary integral expression. The resistivity distribution in the field can thus be identified from the data observed over its boundary, for which some examples are demonstrated [2]. In this paper, the examination is extended to the case where only the data measured over the single surface is used for the inversion. |

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 | 45 |

終了ページ | 60 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016037881 |

JaLCDOI | 10.18926/46978 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 80016037880 |

JaLCDOI | 10.18926/46977 |
---|---|

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 | English |

論文のバージョン | publisher |

NAID | 80015999991 |

JaLCDOI | 10.18926/46976 |
---|---|

フルテキストURL | mfe_37_2_005_012.pdf |

著者 | Abe, Takeji| Sato, Takashi| |

抄録 | Cork is a material that has many characteristics, for instance, light weight, elasticity, insulation against heat, impermeability for liquid, and so forth. There are two types of cork, the natural and the agglomerated corks. In the present paper, compression tests of the natural and the agglomerated cork specimens were carried out. The compression test were done in various directions. Compressive stress was measured by a original compression apparatus, and stress-strain curves were obtained in various directions of the cork specimens. In the natural cork, there are differences between the radial and the non-radial direction. The recovery of dimensions after compression was also studied in respective directions. The structure of the deformed surface was observed by a scanning electron microscope. |

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 | 5 |

終了ページ | 12 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80015999990 |

JaLCDOI | 10.18926/46975 |
---|---|

フルテキストURL | mfe_37_2_001_004.pdf |

著者 | Sakakibara, Akira| Kanadani, Teruto| |

抄録 | Effect of addition of Fe on the occurrence of serration in Al-12mass%Zn alloys was investigated. Specimens aged at 293K for various periods after quenching from various temperatures (T(Q)), 398K to 823K, were tensile-tested at room temperature. Serration occurred more easily and more remarkably with decreasing T(Q) for as-quenched specimens: in the case that T(Q)=448K serration was observed both for the binary and Fe added alloys, while in the case that T(Q)=573K none of the three alloys showed serration. For the binary alloy serration was observed only when the aging period was short enough, but addition of Fe to the binary alloy prolonged the aging period where serration could be recognized. Aging rate measured by hardness was remarkably retarded with the increase of Fe addition. These results confirm the interpretation that the serration in Al-Zn alloy occurs in the early stage of aging where small GP zones or solute clusters are formed. |

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 | 1 |

終了ページ | 4 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80016019142 |

JaLCDOI | 10.18926/46972 |
---|---|

フルテキストURL | mfe_37_1_051_060.pdf |

著者 | Namba, Akihiro| Toyota, Yoshitaka| Wada, Osami| Koga, Ryuji| |

抄録 | This paper presents pulse timing control method to reduce electromagnetic emission from multiple signal interconnections. Pulse timing control gives intentional skew between signals. Higher order harmonics are canceled because of the difference of the phase between the signals. Using this property, pulse timing control can reduce the EMI in wide frequency range. In this paper, we show that radiated electromagnetic field from multiple signal lines reduces its intensity to the same level of the field from one line by using pulse timing control. The result of measurement shows that EMI from four differential transmission lines can be reduced more than 9 dB in the 200 MHz to 800 MHz frequency range. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2002-11 |

巻 | 37巻 |

号 | 1号 |

開始ページ | 51 |

終了ページ | 60 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 80015683518 |