vol.13 (2000)

Bulletin of Computational Science Research Center
Vol.13, 2000 ISSN 0913-8420 Published March 31, 2000

Methodology of Geographical Information Processing on Geomorphology and Hydrology -An Attempt to Measure Drainage Landforms based on Digital Elevation Model-
Daichi Nakayama, Koji Kodera
PDF   Abstract
Recent progress in computers and development of widespread spatial information enables us to use Geographical Information Systems (GIS) in earth sciences, such as geomorphology and hydrology. In general, GIS treat two kinds of data, raster type and vector type. Raster type data possess grid characteristics, and vector type data possess network ones. Satellite images and digital elevation models (DEM) are typical raster type data, and used as the basic dataset for geomorphology and hydrology. For geomorphology and hydrology, extraction of stream networks is one of important procedure to measure topographic characteristics and to construct runoff models. However, manual extraction of stream networks from topographic maps is very time consuming work. So automatic extraction of stream networks from DEM attracts attention of many researchers. Stream networks simulated from DEM are called as drainage direction matrices (DDM). DDM possess combination characteristics of grid characteristics of raster type and network one of vector type. Therefore, it is impossible to handle DDM with simple use of filter operators, which majorly used in image processing software and GIS. So we should consider both characteristics of vector and raster type data when we treat DEM and DDM. In this paper, we explain the basic algorithms to handle DEM and DDM in geomorphology and hydrology.
Sensualization of Spatial Distribution Data in Flow Field
Kenji Kawazura, Yutaka Tanaka
PDF   Abstract
Recently, it has been more important problem that human comprehensibly communicate to the science and technology data. With the advance on recent computer technology, it is possible that computer graphics displays spatial distribution data for physical phenomena in a real environment. On comprehension of the spatial distribution data, however, conventional visual displaying techniques have not provided realistic image and interaction sensation for representation of the data. The purpose of this study is to give new insights to the comprehension of scientific visualization in order to intuitively understand many scientific data. We developed a prototype of haptic system for scientific visualization using virtual reality technology. The word “Haptic” means tactile and/or the sense of touch. In the developed system, visual image data of real objects is mixed to the haptic interface; PHANToM for haptization data calculated from the spatial distribution data according to the real object. A volume model is used for representation of the spatial distribution data that is determined as pressure or density in space.
Teleoperated Control of Construction Machinery with Network
Tomoaki Oba, Naotoshi Kudo, Yutaka Tanaka, Ken Ichiryu
PDF   Abstract
Hydraulic manipulated construction machinery such as an excavator is widely used for heavy duty industrial machines. Recently the construction machinery is used for tele-operated remote control system under the hazardous environment such as space or disaster area. In conventional tele-operated systems, it is difficult for isolated operators to manipulate remotely without presence transmitted from remote locations. In this paper, the remote manipulation system for the construction machinery compensated by virtual environment has been developed. A force reflecting type joystick is used for operating the model of the hydraulic manipulator. The reaction force is calculated by a mathematical model in the virtual environment. A network communication software between the operator’s side with the virtual environment and the remote side with the hydraulic manipulator is applied to the programming language with the JAVA. It is experimentally verified that the proposed remote manipulation system with the reaction force is much effective for the operator.
Portable Tactile Feedback Interface in Virtual Space
Kenichi Amemiya, Yutaka Tanaka
PDF   Abstract
The authors have developed portable force feedback displays to realize the use of force feedback for telerobotic and large-scale virtual environment applications. Tactile sensations as well as force sensations, however, are also required for initial contact detection to virtual objects, because force feedback does not come about prior to any manipulation tasks. In this paper, we have developed a portable tactile display using air jet on a trial purpose to give local shapes of virtual objects and have conducted an evaluation of the perceptual characteristics of the air jet stimulator and the two point difference threshold of index finger pads and thumb finger pads. The tactile display has a eight element array tactile stimulator. In our experiments, subjects are tested to see if they can perceived patterns presented to their finger pad with the device. Two test sets of a cubic geometry shape; the corners, the edge, and the plane surface of the cubic on a PC or a graphics workstation are used to present. It is experimentally verified that the portable display provides the contact sensation for cubic objects.
Haptic Rendering for Virtual Object in Cyber Space
Hirotaka Sakama, Yutaka Tanaka, Takamasa Araki
PDF   Abstract
Recently simulation or training using virtual reality technology has been carried out in engineering fields such as virtual prototyping. In this case, it is more important factor to develop a haptic interface devices with stimulating human’s receptor such as reflecting force or touch sensation from cyber space to operators and an object model with calculating dynamic characteristics of a real object in computers. In this paper, a virtual deformable object model with the surface of spring network and the virtual internal pressure has been proposed for cyber space in computer. The virtual deformable object model is combined with the haptic interface device; the Haptic Master, to communicate for operators between cyber space and real space. Objective constants for the virtual deformable object are identified through experiments for measurement of stiffness for the real objects with the modified haptic interface device. The proposed virtual deformable object model with the identified objective constants in cyber space is applied to the haptic interface system and gives good interactions between the operator in real space and cyber space.
Numerical Simulation of Secondary Flow in a Turbomachinery by Curved Square Duct
Yasuhiro Ishida, Toshifumi Kitahara, Ryuji Chida, Hoshio Tsujita, Shimpei Mizuki
PDF   Abstract
In the passage of a turbomachinery, the secondary flow under the effect of the centrifugal and the Coriolis forces exhibits complex flow pattern, and strongly affects the generation of losses. It is difficult to reveal the relationship between the secondary flow and the loss generation mechanism by using an actual turbomachinery. The most dominant secondary flow is the passage vortex. In the present study, the flow within the two-dimensional curved square duct is selected as a fundamental model for the appearance of the passage vortex. The numerical computations are performed for the various boundary conditions, in which the inlet boundary layer thickness and the inlet velocity profile are changed. The computed results are compared with the experimental results to estimated the validation of the present computation code.
Analysis of Chemical Reaction by Molecular ar Orbital Method
Atsushi Kendo, Yosuke Kataoka
PDF   Abstract
We simulated the reaction of ethyl acetate with methanol and searched for a process by program package of Semi-empirical Molecular ar Orbital calculation, MOPAC. As a result, We confirmed that ethyl acetate reacts with methanol, and then they form methyl acetate and ethanol.
Monte Carlo Simulations for Two-Dimensional Hydrogen Bonding Model of Acetic Acid
Yuri Yamada, Yosuke Kataoka
PDF   Abstract
Acetic acid molecules form chain-like structure in liquid phase, and cyclic dimer in vapor phase by effects of hydrogen bond. This structure change can be deduced that occuring in phase transition or evaporation / condensation process. Then, we made out a new two-dimensional model that reproduces properties of hydrogen bond. In this study, we carried out Monte Carlo Simulations to search temperature / density dependences of phase transition on this model.
A Study of Electromagnetic Fields Visualization near the Electric and Electronic Devices.
S.Miyahara, S.Hayano, Y.Saito
PDF   Abstract
This paper proposes a methodology visualizing for the electromagnetic field distributions near the electric as well as electronic devices. At first, we solve an inverse source problem in order to identify the electromagnetic field sources from the locally measured electromagnetic fields. Second, we calculate the electromagnetic field distributions from the estimated electromagnetic field sources. Finally, we visualize the electromagnetic field distributions over the electric and electronic devices. In the present paper, basic principle and initial experiments to verify our approach are described. As a result, it is revealed that the magnetic field distributions near the electric and electronic devises can be visualized from the locally measured magnetic fields.
Estimation of Current Distribution using a Modified Rogowski Coil
Makoto Aoki, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
We have proposed the modified Rogowski coil, which has a focusing function like a lens. Because of the physical limitations of the materials and constructions, we have confronted to the difficulty realizing an ideal sensor having an infinitely high resolution. However, we have overcome to this difficulty by means of the deconvolution methodology. We have applied our approach to the visualization of the currents on a printed circuit. In order to remove the noise vectors, we have carried out a convolution among the different processed current vectors. As a result, we have succeeded in visualizing the current distributions on the printed circuit boards.
Estimation of 2D Current Distributions by the Generalized SPM Method
Daishiro Sekijima, Seiji Hayano, Yoshifuru Saito, Akira Sawada, Kiyoshi Horii
PDF   Abstract
This paper proposes a new iterative solution strategy for an ill-posed inverse problem. Apply our new solution strategy to evaluating the current distribution yields the current vectors. And, we removed the noisy vectors using the multi resolution analysis of the discrete wavelets. Thus, we have succeeded in visualizing the current vector distributions on the printed circu it boards without destruction or decomposition. Mathematical background of our method reveals that our method is an absolutely stable iterative inverse scheme.
Currents Estimation By Least Squares
Hiroyuki Takahashi, Seiji Hayano, Yoshifuru Saito, Tosiyasu L. KuNII, Akira Sawada
PDF   Abstract
Modern electronics are always composed of the printed circuit board (PCB). When the currents on the PCB are visualized without decomposing the electronics, then the testing and inspecting of the electronics are carried out in an extremely efficient manner. This paper proposes one of the methodologies to visualize a current distribution on the PCB from the locally measured magnetic fields. The current visualization from the magnetic fields is always reduced into a solution of the ill-posed inverse problems. This paper reveals that conventional least squares gives a reasonable solution of the inverse problem. Thus, we have succeeded in realizing a nondestructive testing methodology with high reliability.
The Eigen pattern of graphics and its application to the magnetic field distributions
Kenichi Wakabayashi, Seiji Hayano, Yoshifuru Saito, Tosiyasu L. Kunii, Kiyoshi Horii, Masatake Sakuma
PDF   Abstract
A new concept is introduced to extract the essential and distinct characteristics of the magnetic field distributions. A key idea is to introduce the eigen patterns, which represents the characteristics of magnetic fields independent of their resolutions and space position. We apply the notion of eigen patterns to magnetic fields recovery with high resolution. As a result, we have succeeded in recovering and identifying the all magnetic field distributions.
Magnetic Field Imaging by Differential Equations
Hisashi ENDO, Seiji HAYANO, Yoshifuru SAITO, Tosiyasu L.KUNII
PDF   Abstract
A novel methodology is proposed to visualize the electromagnetic vector fields. First, in order to apply the field theory of computer graphics proposed in this paper, an electromagnetic field vector is represented as a color image. According to our theory, the high-resolution image can be generated in accordance with like a natural phenomenon. Consequently, it is possible to obtain more precise electromagnetic field from the poor measured data. Secondary, we have applied our method to the practically experimented magnetic fields. As a result, validity of our method has been verified.
3D Reconstruction of Contours of Regions based on Color Segmentation
Yusuke Kawano, Daiji Kitagawa, Masami Iwatsuki
PDF   Abstract
In correlation stereo methods, it is difficult that the disparity is unambiguously decided in the case of that the repetitive pattern exists in the images, because corresponding points cannot be uniquely determined by the correlation values. This paper proposes a new robust method of stereo matching by each scanning line in color-segmented images. The correct depth information of contours of regions can be acquired for the scene in which the repetitive patterns are included, because the longest sequence of the same color pattern in both scanning lines is regarded as a matching region. Furthermore, false matching on the contours can be corrected, since correct corresponding regions can be decided by choosing the regions with the largest number of the corresponding points on contours.
Limitation of Search Range by Color Segmentation for Correlation Stereo Method
Hiroyoshi Kudo, Masami Iwatsuki
PDF   Abstract
In conventional correlation stereo methods, it is difficult that the disparity is obtained with accuracy in occluded parts, since correct corresponding points cannot be found. In this paper, we propose a new stereo method that can limit the range for the matching by segmenting each scanning line in right and left images and detecting same color series pattern of the right and left regions before it is adapted to a correlation method. The fault correspondences can be greatly reduced even in the discontinuous boundary of the depth by this preprocess, since occluded regions are removed.
Region Matching and 3D Reconstruction of Curved Surfaces with Textures
Nobuo Abe, Masami Iwatsuki
PDF   Abstract
We proposed a new stereo vision method that can reconstruct 3D structures robustly by matching left and right images based on regions given by color segmentation. This method can detect occluded parts and modify the depth values by assuming that artificial objects consist of flat color regions approximately. However, this method based on color regions cannot acquire correct matching for curved surfaces on objects with textures because the segmented regions are too small. Therefore, this paper proposes region matching and 3D reconstruction method for curved surfaces with textures by detecting seed areas with high accurate matching and growing the seed areas by taking account of the correlation, validity of texture and resemblance obtained from a method for texture analysis called gray level difference method.
Quantization function from an integrate-and-fire neuron circuit
Yoshinobu Kawasaki, Hiroyuki Torikai, Toshimichi Saito
PDF   Abstract
This paper considers an integrate-and-fire neuron circuit to which two periodic inputs are applicable. Depending on the inputs, the circuit can output a variety of pulse-trains, and this paper introduces some typical phenomena. First, applying the sinusoidal first input and varying its amplitude, the pulse-train bifurcates from periodic one to chaotic one. Next, adding the pulse-train second input and adjusting the frequency, the system state is quantized and the chaotic pulse-train is changed into co-existence state of a variety of super-stable periodic pulse-trains. In this case, the dynamics can be analyzed by an integer map: it might give an important suggestion for numerical analysis of continuous-time systems in the next generation.
High-speed Monte Carlo simulation with the maximum rectangular region algorithm
Ryuichi Suganuma, Koichi Ogawa
PDF   Abstract
The photon transportation simulation which uses a Monte Carlo method is an indispensable technique for examining the scatter and absorption correction methods in SPECT and PET. We have developed a method for object description in maximum regions (maximum rectangular regions: MRRs) to speed up photon transportation simulation, and compared the calculation time with that of conventional object description methods. In this paper details of the expansion of MRR to three dimensions are given. Moreover, the effectiveness of proposed method was compared with the VB and octree method in the results of simulations of two kinds of phantoms.
Three-dimensional image reconstruction with MAP-EM method from few projections
Naoko Ohura, Koichi Ogawa, Etsuo Kunieda
PDF   Abstract
It is necessary to know exactly the position and shape of blood vessels when radiation therapy is done for intracranial arteriovenous malformation. Various three-dimensional reconstruction methods for brain blood vessels have been proposed on the basis of clinical importance. But it is very difficult to accurately reconstruct blood vessels of complex shape from a few two-dimensional angiograms. In this paper, we used a MAP-EM method to reconstruct three-dimensional brain blood vessels from a few angiograms. Moreover, we decreased the calculation time by introducing a new penalty function in this MAP-EM method. As a result, a high quality image was obtained with a few iterations than with conventional iterative methods.
Scatter correction in dual-radionuclide SPECT data acquisition by means of a neural network
Akio Matsunaga, Koichi Ogawa
PDF   Abstract
In dual-radionuclide Emission CT, it is hard to eliminate scattered photons from acquired data. This paper discribes scatter correction method with a three layered Artificial Neural Network(ANN). The training data consisted of ratios of primary photons to the total count acquired in a predifined energy windows for each radionuclide (Tc-99m or I-123). The results of simulation showed the effectiveness of the proposed method.
A Study on Justification Scheme for Mobile Agent Systems
Satoshi Kanda, Yutaka Yoshida
PDF   Abstract
It is desirable that a mobile agent should be justified after transferring to one of hosts consisting of an agent system and just before if has been executed on the host. Here,a trial scheme is proposed as a complementary means to other security schemes for access control and data transmission and so on.Its characteristics consist in both restriction of mobile agent execution to during the period,called user active state period,during which its associated user is keeping access to the system and full utilization of time-varying but unique system key distributed to all the related servers.
Statistical Properties of the Information Network Traffic and its Modeling
Hideaki Shino, Takeshi Ueda, Kazuo Yana
PDF   Abstract
Statistical modeling of the information network traffic isimportant in network design which enables a large scale computer simulation before an actual system construction. The modeling may also be used for statistical estimation of useful parameters such as mean traffic duration or mean bandwidth of a single traffic. We have examined the statistical properties of actual netwcrld traffic of our campus and found that the autocorrelation function fits well with a single exponential curve. A Markov model is compatible with this oversrvation. A useful application of the Markovian model for estimating traffic parameters based on observed traffic time series will be described.
Network Traffic Prediction and its Application
Hideaki Shino, Kenji Awa, Tamafuimi Okkubo, Kazuo Yana
PDF   Abstract
Growing needs far network! communication requires efficient traffic cantral. Network traffic prediction will play a key role for the traffic control. Thlis paper proposes a method for the network traffic prediction using the traffic data obtained by thle simple network management protocol (SNMP). The method is based on the presence of short term negative correlation in the difference time series. As an application. This paper proposes a method of traffic control using the traffic prediction and adaptive cache selection.
Test for nonstationary Poisson hypothesis of communication request occurrences in t he information network system
Hideaki Shino, Keiilchi Kitazawa, Masayuiki Jibu, Kazuo Yana
PDF   Abstract
Quantitative grasp of network traffic characteristics is important in designing and operating the information network system. Statistical modeling of thie network traffic change enables a large scale computer simulation of a complex network system before actual system development and help efficient design and evaluation of the target system. This paper proposes a method to characterize the statistical properties of the network traffic occurrences. A test far nonstatianary Poisson hypothesis using a continuous time scaling is introduced and applied to the real data. Thie analysis showed that the request occurrences fit well with nostationary Paissan process.
Application Of Three Dimensional Solid Mechanics Problem To Finite Volume Method
Tomoya Ogawa, Hiroshi Takeda
PDF   Abstract
Finite Volume Method (FVM) can be considered to be a particular case of Finite Element Method(FEM) with a non-Galerkin weighting. In this paper, we discuss the analysis of three-dimensional solid mechanics problem by the FVM. To formularize FVM, we use tetrahedron element as interpolation function. And we suggest automatic element division system by Delauny diagram using tetrahedron. According to this technique, we can analyze analysis model without element connectivity between nodes and elements.
Application of Finite Volume Method for Nonlinear Prob
Shinjiro Inoue, Hiroshi Takeda
PDF   Abstract
In this paper, analysis the development of the fracture are considered on the surface rather than the volume element. To establish the natural computational method of the fracture development phenomena, finite volume based surface integration formulation is proposed rather than finite element volume integration formulation. Proposed formulation will be converted to the standard finite element algorithm for the practical implementation.
Anisotropic Constitutive Equation of Rock Mass based on Damage Mechanics
Hirotaka Asai, Morito Kusabuka, Norio Takeuchi
PDF   Abstract
Constitutive relation of rock mass materials including small and middle discontinuous is considered from the viewpoint of damage mechanics. For isotropic damage material, the constitutive equation was developed within the framework of the thermodynamic theory. In this study, it is possible to expand the isotoropic damage model to the anisotropy. In consequence, it is confirmed that anisotropic damage concept is a valid method for describing a mechanical behavior of discontinuous rock mass within the continuum mechanics.
Numerical Analysis of Environmental Pollutant Transport Problem in Confined Aquifer
Mamoru Akimoto, Morito Kusabuka, Norio Takeuchi
PDF   Abstract
In recent years, ground water and the soil pollution by organic chlorine system compound are serious. To know the progress situation of the pollution, the measurement in the scene is desirable, but actually it is difficult. In this study, it set an near model actually, and it did a numerical analysis about the progress and the purge of the pollution of the aquifer using a seepage flow and an advection diffusion program. Also, to confirm the validity of the analysis technique in this study, it implemented a model experiment about the contamination quality advection diffusion phenomenon and the purge of it in the saturated ground.
Generalized Yield Function Considering The Failure State and The Critical State
Yasushi Ishibashi, Morito Kusabuka, Norio Takeuchi
PDF   Abstract
Hosei-model based on the critical state soil mechanics was the yield function which considered only critical state.When some soils are sheared on the undrained state, they reach the critical state after reaching the failure state. In this study, Hosei-model was expanded to express this behavior (modified Hosei-model). And the comparisons between numerical prediction using modified Hosei-model and the undrained triaxial test data were perfor med in order to evaluate and investigate a practical use of the new model. The finite element analyses about the problem of bearing capacity were carried out. It was ascertained that modified Hosei-model could express the stress path more fairly than Hosei-model. But about the practical use, it was showed that modified Hosei-model had many problem which had to improve.
The Excavation Analysis of Rock Mass Using Anisotropic Yield Function with Hydrostatic Pressure-Dependent
Takeshi Kaneshige, Morito Kusabuka, Hiroshi Takeda
PDF   Abstract
In recent years, as to designs and constructions of the civil structures such as hydroelectric power plant, mechanical behavior of geological materials are estimated by the numerical analysis using the finite element method, and the objective technical judgement is required. In this request, great importance is attached to strength anisotropy following the excavation of rock structures such as the large slope and the underground cavern. In this study, the numerical analysis program for the excavation problem of rock mass was developed, and the stability of the excavated rock structure with anisotropic strength was evaluated by a proposed hardening-type anisotropic yield function depending on hydrostatic pressure. The material parameters included in this yield function can be evaluated by a nonlinear optimization method using axisymmetric uniaxial and triaxial compression test results. This method does not require difficult tests such as simple shear tests for their evaluation. And then, the usefulness of numerical analysis program and the expression of the proposed yield function were investigated using the numerical analysis results.
Non-linear Analysis for Tensile Fracture based on the Finite Volume Concepts
Norio Takeuchi, Hiroshi Takeda
PDF   Abstract
A numerical method based on the Finite Volume (FV) concepts are described for solving tensile failure on unstructured meshes. To establish the computational method of the progressive tensile cracking , Finite Volume based surface integration formulation is proposed rather than Finite Element volume integration formulation. The approach termed the ‘tension-crack analysis’ is based on the load incremental method (rmin method). A range of two-dimensional test problems are solved using Voronoi tessellation. The paper shows that the accuracy of the elastic solution for the FV method are completely equivalent with the FE method. Moreover, it is shown that collapse load on tensile failure is much like RBSM or FE method.
Development of the Analyzing System for the Contact Pressure Distribution in a Temporomandibular Joint
Norio Takeuchi
PDF   Abstract
This paper develops the analyzing system for evaluating the contact pressure distribution in a temporomandibular joint. Specifically, the mandible and cranium are converted to two-dimensional rigid body element models by use of positional data of their contact line acquired from an image input device to compose the Rigid Bodies-Spring Model, where only vertical springs resisting in vertical direction to the contact line are assumed in temporomandibular joint portion and vertical springs resisting in vertical directions as well as shear spring resisting in the direction parallel to the contact line are assumed in the teeth portion. An external force converted from an assumed elevation myodynamia is exerted on this model, and based on the theory of the Rigid Bodie s-Spring Model, stress at each of the spring are calculated to present contact pressures due to reaction forces against the external force mentioned above. At the time when these contradictory stress of the negative stress at the vertical springs of temporomadibular joint portion and the stress at the shear spring of teeth portion are both decreased to approximately 0 during repetition of the calculation steps the stress at each vertical spring of the tempolomadibular joint portion is calculated and displayed of its distribution.
Numerical Method for Seepage Flow Problems by the Finite Volume Method using Linear Potential Field
Chiaki Ishigaki, Norio Takeuchi Morito Kusabuka, Hiroshi Takeda
PDF   Abstract
A numerical method of seepage flow problems by finite volume method using the linear potential field is proposed. Finite volume method (FVM) is widely used as a finite difference approximation using the non-orthogonality grids in fields such as fluid dynamics and transport phenomenon. Especially, it is used as the technique which solves the coupled problem like the pollution diffusion by the groundwater which is a problem of the ground environment. In these methods, there are many cases in which the water head field is handled as being constant. However, FVM can be considered to be a particular case of finite elements with a non-Galarkin weighting. Therefore, the analysis accuracy is improved by raising the degree of the water head field. In this paper, water head field which is identical with the quadrilateral element of FEM is assumed, and the formulation which introduced the concept of FEM is developed. In addition, the result of the comparison examination with the FEM solution according to the simple model for examining characteristics of the solution by this method is shown.
Three dimensional Measurements of Velocity Distribution in Open Channel Flow With Laser Doppler Velocimeter
Hideki IBATA, Takanobu NISHIYA, Rippei MAKINO
PDF   Abstract
Open channel flow has a structure affected by the boundary walls. Flow velocity has the three direction components which are of main flow direction and the secondary flow directions perpendicular to the former. The main flow is stronger than the other secondary flows. Near the boundary walls, that is, channel bottom, side walls and free surface, the main flow weakened by friction of boundaries, appear distinguished the secondary flows. According to the distance from the side boundaries their influences become diminished, and the flow structure appears at the remote parts. For example, longitudinal helicoidal flow is observed by trajectories of dyestuff. In many cases the secondary flows are too weak to measure their velocities. Still more their turbulent flows make difficult to do so. This paper is our first report of the measurements of flow by LDV. Some basic results are reaffirmed; that the position of the maximum velocity of main flow is a little beneath the free surface, and that there would be downward and upward velocity zones alternately in the cross section, etc.
A Cellular Model for Information Systems on the Web - Integrating Local and Global Information -
Tosiyasu L. Kunii, Hideko S. Kunii
PDF   Abstract
Cyberworlds are being formed on the web either intentionally or spontaneously, with or without design. Widespread and intensive local activities are melting each other on the web globally to create cyberworlds. What is called e-business including electronic financing has been conducted in cyberworlds and has crossed a national finance level in its scale. Without proper modeling, cyberworlds will continue to grow chaotic and will soon be out of human understanding. A novel information model we named “a cellular model” serves to globally integrate local models. As an information model, it is applicable to the category of irregular data models that capture spatio-temporal aspects as situations. Mathematically it is based on cellular spatial structures in a homotopy theoretical framework and is an extension of graph theory.
Formulations of 3D wavelet transforms
Yuko Oguchi
PDF   Abstract
Wavelet transform has become one of the most useful methods of signal processings. Especillay, descrete orthogonal wavelets are more available than others. Until now, 1- and/or 2-dimensional transforms have become to be calculated quite easily as shown by the author among others. 3-dimensional transform, however, can not be understood so easily because of the difficulty of algorithm though it is described in some text books how to calculate them. In this report, the orthor has shown that 3D transform is derived reasonabley from ID transform on the viewpoint of matrix multiplication and it’s transpose. Some examples of 3D transforms and their inversions are shown in detail.
A Study of Image Size Changing by the Wavelets Transform
Norimichi Ishida, Tosiyasu L. Kunii, Yoshifuru Saito
PDF   Abstract
Discrete wavelets transform is widely used for the wave and image analysis. On the other side, Major of the conventional image handling is based on the storing the snap shots of graphics image data. These types of image handling methodology greatly depend on the development of hardware. With the development of the modern software and hardware technologies, the demand for high quality and high speed image processing is increasing for various industrial applications. In the present paper, we propose a new methodology of image data handling technique by discrete wavelets transform
Handling Technique of the Dynamic Computer Graphics by the Wavelets
Sawa Matsuyama, Yuko Oguchi, Yoshifuru Saito, Tosiyasu L.Kuni
PDF   Abstract
One of the distinguished properties of the discrete wavelets transform is that the major dominant factors can be extracted from the data. In the present paper, we have tried to shrink and enlarge the color image data in static as well as dynamic states by means of the vector wavelets transform. Key idea is that the color image data are represented in terms of the 3- dimensional vector data by corresponding the red, green and blue orthogonal components of the image to the 3-dimensional orthogonal x, y and z components. Several examples demonstrate the usefulness of our new method to work out the graphical communication tools.
Three Dimensional Magnetic Fields Data Analysis by the Wavelets
Sawa Matsuyama, Yuko Oguchi, Hisashi Endo, Daisiro Sekijima, Yoshifuru Saito
PDF   Abstract
One of the distinguished properties of the discrete wavelets transform is that the major dominant factors can be extracted from the data. We have applied this property to the data compression and reducing the noise in measured data. In the present paper, we apply the discrete wavelets transform to the three dimensional-magnetic fields measured over a switching regulator. The measured magnetic fields are the three-dimensional in space and time dependents. Thereby, in order to handle these magnetic field data, it is essentially required to use a computer installing an enough memory. We propose one of the methodologies to process a large amount data based on the discrete wavelet transform.
Facial Information Extraction
Harumi Iwasaki, Yoshifuru Saito, Chieko Kato, Susumu Hanta, Kiyoshi Horii
PDF   Abstract
Principal purpose of this paper is to extract a facial change among the faces at the different situations for the psychological applications. Because of the difficulties fixing the face location at a particular coordinate, an extraction of the facial change from the comfortable to uncomfortable is relatively difficult task for a computerized approach. To overcome this difficulty, we propose a method, which combines the Fourier with wavelets approaches. After, a global facial change is extracted by the Fourier transform; application of the multi-resolution analysis of wavelets makes it possible to extract the local facial changes.