JaLCDOI 10.18926/15357
フルテキストURL Mem_Fac_Eng_OU_35_53.pdf
著者 Kim Tae Yong| 加川 幸雄|
抄録 Fresnel zone plate lens (FZPL) has widely been used in electromagnetic antenna applications. Most analysis method based on the potential (scalar) wave approximation has been applied to a few very limited and simplified cases. The present paper analyzes the FZPL in more general form including the diffraction and transmission using the method of moments (MoM). The focusing gain characteristics in the oblique incidence as well as in the normal incidence are considered. The MoM solution using the three-dimensional vectorial formulation requires a large memory space for the FZPL as it is operated at a short wavelength. This is simply overcome by using an iterative conjugate gradient method for the numerical evaluation. The MoM solutions are compared with the other solutions.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 53
終了ページ 61
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307849
JaLCDOI 10.18926/15352
フルテキストURL Mem_Fac_Eng_OU_35_35.pdf
著者 島村 薫| 内田 哲也| 井上 智博|
抄録 Rigid polymer, poly(p-phenylene benzobisthiazole), formed lamellar crystals where the molecular chains were oriented perpendicular to the lamellae. It was supposed that, because of wide distribution in the chain length, the lamellar surface bristled with the chain cilia among which many voids were included. Crystallographically, this region afforded us a transitional structure from full to deficient packings of chains. The structure was analyzed using the scanning probe microscope. In the course the method for imaging one molecular chain end was developed. From the images it was concluded that an isolated long cilius did not move so violently at room temperature.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 35
終了ページ 40
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307784
JaLCDOI 10.18926/15350
フルテキストURL Mem_Fac_Eng_OU_35_29.pdf
著者 島村 薫| Munesawa Yuhji| 内田 哲也|
抄録 Poly (ethylene-block-vinyl alcohol), which consisted of both hydrophobic and hydrophilic blocks, was prepared by using polyethylene single crystals as starting material. Polyethylene single crystals reacted with fuming nitric acid resulting in long methylene chains with functional groups such as COOH and NO(2) at the ends (the chain length were almost same as the lamellar thickness of polyethylene single crystal). The functionalized methylene chains were allowed to react with 4-aminostyrene to give corresponding amides, i.e., methylene chains with vinyl groups at the ends (macromer). The macromers were extended by block-copolymerization with vinyl acetate, then saponified resulting in PE/PVA block co-polymer. The block copolymer was molded into sheets which were subsequently heat-treated in contact with hydrophilic or hydrophobic media. Depending on the media, the sheet surface changed at high temperature reversibly from hydrophilic to hydrophobic and vice versa. The surface property was fixed by quenching because both blocks were able to crystallize. Thus the surface of this material can be tailored for various purposes at high temperature, and then used in stable at room temperature.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 29
終了ページ 34
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307155
JaLCDOI 10.18926/15346
フルテキストURL Mem_Fac_Eng_OU_35_9.pdf
著者 阿部 武治| 坪井 智昭|
抄録 The evaluation of microscopic inhomogeneity of polycrystalline aluminum is performed by measuring the hardness in respective grains. The recently developed ultra-micro hardness tester is used and the effects of the test pattern, the indentation load and the indenting velocity are examined. Then, the relationship between the increase in the hardness caused by the work hardening and the deformation of respective grains are statistically investigated. The hardness testing mode in which the initial load is applied before the onset of measurement gives more stable results than the testing mode without the initial load. The test condition with the indentation load of 9.8mN and the indentation velocity of 0.2 μm/sec seems to be optimum and gives the least dispersion of the measured values in grains. It is shown that the hardness values of respective grains in polycrystalline aluminum as well as their dispersion increase with the applied plastic strain. Discussion is made on the microscopic deformation behavior of polycrystalline aluminum.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 9
終了ページ 19
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307825
JaLCDOI 10.18926/15348
フルテキストURL Mem_Fac_Eng_OU_35_21.pdf
著者 S.kovalenko, Volodymyr| Uno, Yoshiyuki| Okamoto, Yasuhiro| Anyakin, M.| Lutay, A.| Shubul, Khaled Al.|
抄録 In electric power industry, there is a problem of achieving stable joint in different components using high productive and efficient technologies. One type of these components is packages of slices for magnetic circuit of electric motors, transformers etc., which need reliable means for their fixing. Laser welding is proposed to solve this problem as an alternative for existing technologies. The development of the laser welding process is presented based on process simulation, study of heat history and comparison with experimental results. Laser beam additional scanning technique is proposed to improve the quality and efficiency of the joining operation.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 21
終了ページ 28
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307424
JaLCDOI 10.18926/15358
フルテキストURL Mem_Fac_Eng_OU_35_63.pdf
著者 Shinomiya Shigeru| 東辻 千枝子| 鶴田 健二| 東辻 浩夫|
抄録 We present a theoretical study of Si(1-x)Ge(x) alloys based on tight-binding molecular dynamics (TBMD) calculations. First, we introduce a new set of nonorthogonal tight-binding parameters for silicon and germanium based on the previous work by Menon and Subbaswamy [Phys. Rev. B 55, 9231 (1997); J. Phys: Condens. Matter 10, 10991 (1998)]. We then apply the method to structural analyses of Si(1-x)Ge(x) alloys. The equilibrium volume and atomic structure for a given x are obtained by the TBMD method. We also calculate the bulk modulus B, elastic constants C(11), C(12) and C(44) as a function of x. The results show that the moduli vary monotonically, but nonlinearly, between the values of Si crystal and Ge crystal. The validity of the results is also discussed.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 63
終了ページ 75
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307673
JaLCDOI 10.18926/15366
フルテキストURL Mem_Fac_Eng_OU_35_147.pdf
著者 山際 雅詩| 酒井 裕|
抄録 The Cry4A toxin is a dipteran-specific insecticidal protein produced by Bacillus thuringiensis subsp. israelensis as a protoxin of 130 kDa. Its active form is a heterodimer of 20- and 45-kDa fragments which is generated by an interhelical cleavage of a 60-kDa intermediate at the position of Gln236 between α5 and α6 helices in domain I. On the other hand, Cry1Aa, which is also produced as a 130-kDa protoxin but toxic to lepidopteran larvae, was processed into the active 60-kDa fragment with no additional cleavage. To investigate the role of the intramolecular cleavage of Cry4A for its insecticidal activity, the loop between α5 and α6 of Cry4A which includes the cleavage site was substituted for the corresponding region of Cry1Aa. The resulting mutant designated GST-60Loop was expressed as a GST-fusion protein. A difference of the processing profile was observed between GST-60 and GST-60Loop in the in vitro digestion assay by trypsin, and the insecticidal activity of GST-60Loop was two-fold lower than that of GST-60. These results suggested that the interhelical cleavage of Cry4A promoted the toxicity against C. pipiens larvae.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 147
終了ページ 154
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307324
JaLCDOI 10.18926/15380
フルテキストURL Mem_Fac_Eng_OU_35_197.pdf
著者 Nogami, Yasuyuki| Morikawa, Yoshitaka|
抄録 Modern communication engineerings, such as elliptic curve cryptographies, often requires algebra on finite extension field defined by modulus arithmetic with an irreducible polynomial. This paper provides a new method to detemine the minimal (irreducible) polynomial of a given proper element in finite extension field. In the conventional determination method, as we have to solve the simultaneous equations, the computation is very involved. In this paper, the well known "trace" is extended to higher degree traces. Using the new traces, we yield the coefficient formula of the desired minimal polynomial. The new method becomes very simple without solving the simultaneous equations, and about twice faster than the conventional method in computation speed.
キーワード finite field minimal polynomial irreducible polynomial higher degree trace trace cryptography
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 197
終了ページ 205
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307992
JaLCDOI 10.18926/15382
フルテキストURL Mem_Fac_Eng_OU_35_207.pdf
著者 中西 透| Fujiwara Toru|
抄録 In the group signature scheme with a trusted party, a verifier can determine whether or not a signature is made by a member of the group, but cannot identify the member who signed the signature. In case of dispute later on, the signer can be identified by the trusted party. However, for efficient group signature schemes proposed so far, removing a member from the group can be not efficiently performed. In this paper, a group signature scheme with an easy membership canceling is proposed. By sending a request to use a resource together with the group signature on it to the manager of the resource, the manager can control anonymous accesses to the resource. In such an application, the proposed group signature scheme is suitable for canceling of the access privilege.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-03-27
35巻
1-2号
開始ページ 207
終了ページ 212
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307232
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
36巻
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
著者 Faculty of Engineering, Okayama University|
発行日 2001-12
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
36巻
1号
資料タイプ その他
著者 Faculty of Engineering, Okayama University|
発行日 2001-12
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
36巻
1号
資料タイプ その他
JaLCDOI 10.18926/47005
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
36巻
1号
開始ページ 117
終了ページ 121
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120003497031
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
36巻
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 10.18926/47004
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
36巻
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
36巻
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
36巻
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
36巻
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
36巻
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
36巻
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