JaLCDOI 10.18926/19616
FullText URL Mem_Fac_Eng_OU_33_1_53.pdf
Author Li Sen| Osaki, Hirokazu| Kajihara, Yasuhiro| Munesawa, Yosiomi|
Abstract A method for designing a monitoring system with multiple cameras is proposed in order to supervise and recognize the progress of wide work area. First, a wide view camera is deveeloped by combining several usual cameras so that its visual angle could cover more than π/2. Secondly, A method for determining the number and location points of cameras is proposed by considering the shape of monitored area and the installation cost of cameras. The monitored area is divided into three kinds of basic shape (rectangular form, L form and convex form). For every basic shape area, the camera is located at the vertex pasition, so that the whole area can be monitored by the camera.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1998-11-30
Volume volume33
Issue issue1
Start Page 53
End Page 57
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002309122
JaLCDOI 10.18926/15411
FullText URL Mem_Fac_Eng_OU_29_2_13.pdf
Author Dwianto Gatot| Osaki, Hirokazu| Kajihara, Yasuhiro|
Abstract We propose a method to design the supplying method of parts to an assembly line. Three types of supplying model (Serial, Parallel, and Mixed) are proposed based on the relation between the area of part and that of the transportation equipment. The part is supplied by the pallet on which the all parts of one product are arranged or by the lot of one part. AGV or conveyor are used to transport the pallet. The supplying model is evaluated from the total transportation cost calculated from the price of the transportation equipment and of land.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1995-03-27
Volume volume29
Issue issue2
Start Page 13
End Page 21
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307903
JaLCDOI 10.18926/14156
FullText URL Mem_Fac_Eng_39_1_71.pdf
Author Nogami, Yasuyuki| Morikawa, Yoshitaka|
Abstract This paper proposes an algorithm for generating prime order elliptic curves over extension field whose extension degree is a power of 2. The proposed algorithm is based on the fact that the order of the twisted elliptic curve is able to be a prime number when the extension degree for the twist operation is a power of 2. When the definition field is F(2(40)−87)(4) , the proposed algorithm can generate a prime order elliptic curve within 5 seconds on PentiumIII (800MHz) with C language.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 2005-01
Volume volume39
Issue issue1
Start Page 71
End Page 81
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002308036
JaLCDOI 10.18926/15365
FullText URL Mem_Fac_Eng_OU_30_1_1.pdf
Author Dong Liu| Kajihara, Yasuhiro| Osaki, Hirokazu| Munesawa, Yoshiomi|
Abstract A method for standardizing parts is proposed. This method aims to reduce the sort of parts for cutting the manufacturing cost and for improving specifications of parts. Two linear mathematical programming models are proposed for standardizing the parts. One model aims at cutting cost half without causing any degradation of mechanical specifications of parts. The other model aims at doubling mechanical specifications of parts below the acceptable manufacturing cost. These models are formulated in 0-1 integer programming forms. The integer programming model shows which part is common to other parts. An example is shown to demonstrate the use of the developed method.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1995-12-28
Volume volume30
Issue issue1
Start Page 1
End Page 7
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307491
JaLCDOI 10.18926/15592
FullText URL Mem_Sch_Eng_OU_2_127.pdf
Author Misaki Takayoshi| Kato Osamu| Yamamoto Hideki|
Abstract Described in this paper is a method of automatic washing for salt contaminated insulators. An average value of leakage current through the surface of the pilot insulator in a duration is measured, for this is a function of the quantity of salt adhered and its moisture content. In each cycle, the program signals give one by one the instructions on a start and an end of the integration of leakage current, a detection of the integrated value, a stop of the washing device and a reset of the integrator. The integrator consists of RC circuit and the main detecting part consists of the thyristor whose firing gate voltage is used as a reference value. If the integrator output rises above the firing gate voltage, the pulse signals are made in the signal conversion part at the same time that the thyristor turns on, which are distributed to the pump motor or the electromagnetic valve. Then the insulators on hot-line are washed all together in the appointed duration. Finally, by the various experiments this method was proved to have enough accuracy and reliability in practical use. The conclusions are summarized as follows. (1) An average value of leakage current is justified to be the detecting variable. (2) The RC circuit used as the integrator is proved to be easy in maintenance. (3) Because of the fairly short duration of the detecting action, the integrator is kept in a sufficiently safe condition under expected environment.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1967-04-01
Volume volume2
Issue issue1
Start Page 127
End Page 132
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307133
JaLCDOI 10.18926/15480
FullText URL Mem_Fac_Eng_OU_25_1_1.pdf
Author Gao Hong| Wada, Tsutomu| Noritsugu, Toshiro|
Abstract How to reduce and simplify the calculation for image recognition is a very attractive and important issue in order to realize the real time control of a robot based on the image recognition results. This paper describes a method of extracting 2 - dimensional geometrical features of cubic objects based on the normal vector distributions from the visual information obtained with the laser range finder to reduce the calculation of the image recognition. In this research a laser beam is scanned in the horizontal plane to which the cubic objects stand vertically and the laser spot is detected with a TV camera every sampling time. These spots make an intermittent locus which includes some special lines corresponding to the cubic objects. To extract the features of the cubic objects, we utilize the normal vectors formed on the locus. If some normal vectors distribute in the same direction and the origin of the normal vectors are very close to their neighbor's, these normal vectors can be classified into the same class, -the straight line class. Because the normal vectors on the neighbor surfaces of the cubic objects are vertical to each other, we use this property to determine the pair of straight lines which belong to the cubic objects. Making the histogram based on the normal vectors with the same direction, we obtain the peaks which are supported by the points on the cubic object surfaces. Then, the points can be extracted from the set of points on the whole locus inversely according to the relations with the peaks and the features of the cubic object can be extracted by applying method of least square to these extracted points. The experiments proved the availability of the proposed processing algorithm.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1990-12-14
Volume volume25
Issue issue1
Start Page 1
End Page 13
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002308010
JaLCDOI 10.18926/15624
FullText URL Mem_Sch_Eng_OU_3_157.pdf
Author Misaki Takayoshi| Okamoto Takuji| Kato Osamu|
Abstract In the analog circuits for the systms governed by the dilfercntial equations with the coefficients which are a function of one or mOre of the dependent variables, the magnitudes of their circuit elements must be variable in accordance with the nature of the function. Such circuit elements can be realized by means of inserting or removing the additional elements with high speed switches in the analog circuits. Particularly, in the case of varying stepwise this method is effective. But as an analog circuit is regarded as a short-time or repetitive type analyzer, the above switches must be instantaneous operation. In this paper, first, it is made sure by the experiments that some of the transistor switches arc met this condition, and moreover arc very low closed resistance, very high open resistance and neglegible small voltage offsets. Next, the basic technique for the direct analog simulation usiug transistor switches is described about the simple example, i.e. the oscillatory system with varying cross-scctional surge tank. Finally, as its applications, the transient problems of these oscillatory systems arc solved by means of these analog circuits.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 157
End Page 162
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307953
JaLCDOI 10.18926/19601
FullText URL Mem_Fac_Eng_OU_31_2_61.pdf
Author Yamada Mitsuru| Osaki, Hirokazu|
Abstract At present, the two dimensional CAD systems which are used to make drawings go around widely. But in order to use design data at the lower stream of production process, the replacement from the two dimensional CAD systems to the three dimensional CAD systems have started. Accordingly it is dimensional drawings for the three dimensional shapes. And it is also necessary to store them in the three dimensional CAD systems. And in the studying of the machine vision which is often used as "Eyes of robot" , it is being studied the method to recognize the three dimensional objects from the two dimensional image. This is the problem about data exchange, too. Therefore in this report, we propose the method to exchange the plural two dimensional elements of figure from image relations between elements were found from reference of the element coordinates. Next, the three dimensional shapes were reasoned from reference of the knowledge (for corner, etc) prepared beforehand. Then that data were exchanged to the three dimensional CAD data. We report one example about this method.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1997-03-28
Volume volume31
Issue issue2
Start Page 61
End Page 65
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002309050
JaLCDOI 10.18926/19680
FullText URL Mem_Fac_Eng_OU_33_2_85.pdf
Author Yamada, Mitsuru| Osaki, Hirokazu|
Abstract We reason the circumstances around the three-dimensional vertex from the information about the intersection point in the two-dimensional image data inputted from a camera on the premise that we use this method as the eye ot the robot. In this method, we use the Vertex-Dictionary. We make the Vertex-Dictionary by calculation from CAD data of object figure (these data are already known) and the position data of the point of view. This dictionary includes the data of position and relations of connect surface etc. about a vertex. We get the data of three-dimensional vertex by comparison the data of two-dimensional intersection point in image data and Vertex-Dictionary. And we get the three-dimensional object by reasoning about the information of circumstances of all vertexes. Then we can recognize the three-dimensional object from image data. In this report, we explain the process to calculate the Vertex-Dictionary and some examples about this method.
Publication Title Memoirs of the Faculty of Engineering, Okayama University
Published Date 1999-04-27
Volume volume33
Issue issue2
Start Page 85
End Page 89
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002309120
Author Itano, Arao| Arakawa, Satiyo|
Published Date 1932-01-19
Publication Title Berichte des Ohara Instituts für landwirtschaftliche Forschungen
Volume volume5
Issue issue2
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/15622
FullText URL Mem_Sch_Eng_OU_3_143.pdf
Author Himei Toyoji| Inoue Jyunichi| Fukumori Kooichi|
Abstract A modified type of the resonant turn-off d-c chopprr using an auxiliary SCR, compared with its conventional one, has no limitation about its starting and also operates more steadily. Presented in this paper, making a comparison between the modified type and the conventional one, are the circuit analysis and its efficiency measurement from the point of view of overall efficiency, that is, the ratio of the output to the input. Furthermore, some effects of the source impedance, counter emf load, etc. are discussed. As a result, it has been analytically clarified that this modified type is different from the conventional circuit only by one terminal connection of turn-off capacitor, but has the features of uncompounded circuit configuration, no limitation about its starting and more steady operation.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 143
End Page 150
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307152
JaLCDOI 10.18926/1018
FullText URL 10_0089_0100.pdf
Author Ishiyama, Ken-ichi|
Abstract In a work concerning stability analysis, Burmeister, Dobell, and Kuga(1968) showed the properties of Solow type growth model with many capital goods. They suggested that the one-sector Solow model is stable not because it has only one capital good, but because it has particularly simple saving function. In the analysis, they proved the global stability of the multi-sector Solow model. The model is, however, unrealistic due to their neoclassical flamework in which full employment is permanetly kept. In this note, we allow for the existence of unemployment in their model. We substitute linear functions for Cobb-Douglas production functions. Also we introduce some elements of Goodwin's model (Goodwin(1965)), thus generalizing Sato's model in Sato(1985). The purpose of this paper is to analyze of the stability of a thus extended Goodwin model. We consider the relationship between the number of capital goods and the stability of the system. This paper is organized as follows. In section 2, we propose an extended Goodwin model and show the existence of a positive equilibrium. In section 3 concerning a neighbourhood of the equilibirium the property of three dimensional case is compared with that of two dimensional case. Section 4 is devoted to a couple of analyses by computer simulations. Some comments are given in the final section.
Keywords Multi-Sector Goodwin Model
Publication Title 岡山大学大学院文化科学研究科紀要
Published Date 2000-11
Volume volume10
Issue issue1
Start Page 89
End Page 100
language 日本語
File Version publisher
NAID 120002306040
Author Moritsugu, Masumi| Kawasaki, Toshio|
Published Date 1979-05
Publication Title Berichte des Ohara Instituts für landwirtschaftliche Biologie, Okayama Universität
Volume volume17
Issue issue4
Content Type Departmental Bulletin Paper
Author Seo, Takuro| Yamaguchi, Nobuyuki|
Published Date 1968
Publication Title Berichte des Ohara Instituts für landwirtschaftliche Biologie, Okayama Universität
Volume volume14
Issue issue3
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/15690
FullText URL Mem_Sch_Eng_OU_10_2_55.pdf
Author Nakata Takayoshi| Ishihara Yoshiyuki| Matsubara Kazunori| Nakano Masanori|
Abstract A new method have been developed based upon analogue-to-digital conversion techniques and memories. The method involves the scaling of operating frequency from "real" to "optimum" for the power loss measurement. The advantages of using this techniques are as follows: (1) extreme availability at lower frequency region, (2) high accuracy and high stability, (3) simple measuring procedure, (4) digital indication. This method can be measured the power losses over the frequency range 0.1Hz to 1kHz for magnetic circuit and d.c. to 1kHz in such a purely resistive circuit. We estimate the accuracy of this core loss measuring system within 1.0% over all these frequency range. Using this system, specific core losses of the various grades of silicon iron have been measured in the frequency range 0.1Hz to 200Hz.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1976-01-27
Volume volume10
Issue issue2
Start Page 55
End Page 61
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307969
Author Nisikado, Yosikazu| Matsumoto, Hiroyoshi|
Published Date 1929-08-28
Publication Title Berichte des Ohara Instituts für landwirtschaftliche Forschungen
Volume volume4
Issue issue2
Content Type Departmental Bulletin Paper
Author Koizumi, Kenji|
Published Date 1960
Publication Title 岡山大学農学部学術報告
Volume volume16
Issue issue1
Content Type Departmental Bulletin Paper
Author Itano, Arao|
Published Date 1938-05-03
Publication Title Berichte des Ohara Instituts für landwirtschaftliche Forschungen
Volume volume8
Issue issue2
Content Type Departmental Bulletin Paper
Author Itano, A.| Tsuji, Y.| Hasegawa, T.| Moriya, T.|
Published Date 1937-12-14
Publication Title Berichte des Ohara Instituts für landwirtschaftliche Forschungen
Volume volume8
Issue issue1
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/15714
FullText URL Mem_Sch_Eng_OU_12_23.pdf
Author Yamashita Yuhiko| Monobe Kazuo|
Abstract A new realistic, structural model is proposed for the glassy solid state of poly(ethylene terephthalate) (PET). The model is considered basing on crystallization behaviors from the glassy state of PET, and in particular including the evidence from the estimation of chain folding energy in this report. When PET is quenched from its melt into the glassy state, irregular folds with lower conformational energy remain in glassy structure and disturb the three dimensional arrangement of the chains connected with the folds. In conclusion, we suggested that the structure of glassy PET is not in amorphous state which is represented by the interpenetrating random coil model, but in frozen metastable state which can be approached from the chain folded structure of polymer crystals.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1978-02-25
Volume volume12
Start Page 23
End Page 28
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307771