可視化情報学会誌
Online ISSN : 1884-037X
Print ISSN : 0916-4731
ISSN-L : 0916-4731
20 巻 , 1Supplement 号
選択された号の論文の146件中1~50を表示しています
  • 河内 啓二
    2000 年 20 巻 1Supplement 号 p. 5-10
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Flight mechanism of insect is different from that of our familiar system of aircraft, machinery, or bird. Recent studies quantitatively indicated that many features of insect flight mechanism, such as thin airfiol, high beating frequency, and continuous beating motion, well conform to the fluiddynamic condition given to the insect.
  • 藤原 敏
    2000 年 20 巻 1Supplement 号 p. 11-16
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    A cerebral contusion and DAI (diffuse axonal injury) are very important in a medicolegal cases of the closed head injury. In this paper, I will report the epitome of the recent advances in the study on the biomechanics of them. Coup contusion can be mainly attributed to the skull inbending and/or the skull fracture. As to the mechanism of the contrecoup contusion, several theories are reported. They are Holbourn's rotation theory, Gurdjian's theory (anatomical features of the skull), Gross's cavitation theory, Lindenberg's theory (deformation force and acceleration one) and Courville's theory (transmitted of waves of force). As to DAI, Gennarelli's theory (high rate of angular acceleration operating for a long period). As to the brain injuries including a cerebral contusion and DAI, Ommaya's centripetal theory and Willinger's theory (natural frequency of impact) are reported.
  • 上坂 充, 木下 健一, 西原 鉄平
    2000 年 20 巻 1Supplement 号 p. 17-24
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Dynamic visualization of atomic motion is going to be available by the femtosecond beam flash method. The method utilizes two synchronized femtosecond beams such as electron, laser, X-ray, ion and neutron. This can be done at Nuclear Engineering Research Laboratory, University of Tokyo. Especially, the time-resolved X-ray diffraction, which is one of the femtosecond beam flash methods, enables the dynamic visualization of atomic motions. Visualized atomic motions in coherent phonon, phase relaxation, phase transition, thermal expansion and shock wave in GaAs monocrystal irradiated by the femtosecond laser are described in this paper.
  • 樋口 秀男
    2000 年 20 巻 1Supplement 号 p. 25-30
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    The motilities of life are produced by motor proteins, for example, myosin molecule in muscle contraction, kinesin molecule in vesicle transportation. We reviewed the mechanics reaction and single ATP turnover of individual kinesin and myosin molecules. The displacement of kinesin during force generation bound to bead was determined by measuring the position of the beads with nanometer accuracy. The analysis of movement indicates that each kinesin head mainly steps by 16 urn between the binding sites while kinesin molecules exist at 8 nm intervals. The single ATP turnover was observed using fluorescence labeled ATP. The results suggest that myosin has a memory state which stores chemical energy from ATP hydrolysis.
  • 今井 紀夫, 工藤 成史, 曲山 幸生
    2000 年 20 巻 1Supplement 号 p. 31-32
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Many kind of bacteria swim in aqueous solution by rotating their helical flagellar filaments. Each filament is driven by a rotary motor (flagellar motor) embedded in the cytoplasmic membrane and can rotate very fast. The rotation speed reaches from 100 to more than 1000 r/sec. The possible deformation of such fast rotating flagellar filaments has not yet been observed because of difficulties mainly caused by their extremely small size. We tried to observe the deformation of the flagellar helices of swimming Vibrio alginolyticus cells with laser dark-field microscope. The laser dark-field image was recorded by using an image intensified CCD camera equipped with the electrical shutter. The change in the helical pitch was observed to be rather small, around 10%.
  • 曲山 幸生, 工藤 成史
    2000 年 20 巻 1Supplement 号 p. 33-36
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    There are some cases where the swimming speed of a bacterial cell in a polymer solution increases with the viscosity. This phenomenon is not yet explained by the traditional theories, and such phenomena never appear under macroscopic conditions. We showed it could be explained by the hypothesis in which the anisotropic effect of polymer was introduced into a traditional theory. To evaluate the hypothesis, it is necessary to measure the hydrodynamic force acting on an ultra small needle in both the directions parallel and perpendicular to its axis. Tobacco mosaic virus (TMV; needle-shaped, 18 nm in width, 400 nm in length) is a suitable sample for this purpose. It is, however, very difficult to measure TMV Brownian motion and estimate the force acting on it because TMV can not be observed by typical optical microscopy. In this paper, we introduce our recent study about the measurement of TMV Brownian motion.
  • 桑原 圭太, 太田 正廣
    2000 年 20 巻 1Supplement 号 p. 37-38
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    We succeed in the experiments of optical trapping and control of dielectric microspheres in water. Furthermore we confirm that a fine nonsphere rotates at the same position. Therefore we calculate the radiation pressure acting on a fine particle, and discuss on the phenomena that a trapped nonsphere has been rotating. We also show the behavior of the rotating nonsphere in water.
  • 渡辺 祐一, 太田 正廣
    2000 年 20 巻 1Supplement 号 p. 39-42
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    An axis control system by a magnetic force is proposed for a micro sized rotor. Rotation mechanism of the micro rotor for a laser opto microengine is discussed. 4 types of the micro rotor systems are manufactured. The rotational rates of the rotor systems were measured by a optical measuring system.
  • 齋藤 賢一, 土肥 隆, 駒谷 政男, 稲葉 武彦
    2000 年 20 巻 1Supplement 号 p. 43-46
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Multi-resolution (MR) molecular dynamics (MD) method is developed for the investigation of nano-scale atomic cluster in collision and coalescence processes. Lennard-Jones interatomic potential for copper crystal is used. Equations of motion both for ordinary MD particles and for clusters treated as rigid bodies are derived from the same Lagrangian, and are solved simultaneously. It is found that ordinary MD regions and rigid body regions should be adequately bounded. To cope with this difficulty, interactive molecular dynamics method using computer graphics is adopted to MRMD algorithm for the selection of adequate MD region. In the interactive simulation, intentional shift of each atom or cluster is also possible. This enables one to set up various initial conditions of calculation and to simulate any possible physical process. It is recognized that real-time nature and interactivity are advantageous and vital to enhance the reality and familiarity in the atomic or molecular simulation. It is concluded that, for more efficient interactive visualization, graphics ability of computer is further required.
  • 祁 影霞, 太田 正廣
    2000 年 20 巻 1Supplement 号 p. 47-48
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    A nucleation process of methane hydrate is numerically simulated using a molecular dynamics method with a modified MCY potential model in addition to a simple Lennard-Jones potential model. A single cubic unit cell of the fully-occupied hydrate I is supposed to be an object of research. It is shown that the hydrate is formed with the lowest potential energy at the corresponding temperature. The formation process can be divided into three stages that includes the dispersion of the gas molecules, the construction of the hydrate cavities, and the stabilization of the hydrate structure.
  • 村上 和彦, 石川 真也, 山口 元, 太田 正廣
    2000 年 20 巻 1Supplement 号 p. 49-50
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Thermodynamic Properties of an Aqueous Solution were numerically simulated by Monte Carlo method. By NVT ensemble of the MC method, the bonding between ions and water molecules were expressed visually. The enthalpies of the bonding were compared with existing experimental data, and these were almost same. Moreover, the densities of Lithium-Bromide aqueous were calculated as for wide range of temperatures and concentrations.
  • 可視化を用いた設計事例とそのメリットについて
    川野 浩一郎, 石塚 勝
    2000 年 20 巻 1Supplement 号 p. 51-54
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Many researches have been performed about the visualization technology of heat and flow. Therefore, visualization technology can obtain now not only qualitative information but also quite exact quantitative information. In this keynote lecture, the examples and merits of concrete visualization technical application in the industrial design and development with which authors have been concerned are introduced.
  • 高本 雄治, 齋藤 善雄, 河西 勝興
    2000 年 20 巻 1Supplement 号 p. 55-58
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    We have used lagertanks in the storage process of beer, and the shape of lagertank is cylindro-conical. The outer wall of the tank is cooled for maturing beer during the storage process with experienced control system. However the cooling process in the tank is hardly known, so we have studied the cooling process with cylindro-conical mini-tank. Here we report the cooling process based on the visualization and the measurement of temperature in the tank.
  • 霜田 貴史, 望月 貞成, 村田 章
    2000 年 20 巻 1Supplement 号 p. 59-62
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    The objective of this study is a development of a more compact and efficient fin and tube heat exchanger which will use less energy and less space while generating higher heat transfer performance. The attention was especially focused on the examination of the flow behavior of the air passing through a fin and tube heat exchanger and its effects on the heat performance. This heat exchanger is constructed from the plate fins and the tubes carrying the refrigerant. The plate this also have secondary fins in order to affect the flow behavior of the air. The flow in the near tubes for three test cores with different secondary fin arrangements was investigated by using the PIV method. The results confirmed that the highest heat transfer performance was obtained for the test core 2 due to the smallest size of the separation area and higher flow velocity near tube.
  • 佐々木 富也, 中村 仁, 岩崎 秀夫
    2000 年 20 巻 1Supplement 号 p. 63-64
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    We have developed a high power and high speed X-ray CT helical scanner, whose rotational speed is 120rpm. Heat dissipation of the machine is about 2.5 times more than that of previous machine, hence thermal design is becoming very important item in design. Three-dimensional thermo-fluid analysis and flow visualization experiment were performed in order to understand temperature and flow field in the gantry. The results of three-dimensional thermo-fluid analysis and flow visualization led some understanding to be applied in thermal design, and served an important role as thermal design tools.
  • 西田 昌史, 植村 知正, 鉄川 貴志
    2000 年 20 巻 1Supplement 号 p. 65-66
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    The Successive Abandonment Method for fast PIV analysis is improved both in speed and reliability. The improvement is achieved through following three points : selecting characteristic pixels prior to the successive abandonment analysis, calculation order optimization in accumulating absolute differences, estimation method of displacement. Accordingly, the performance of the new algorithm shows at least 50% reduction in analysis time, and erroneous vectors becomes fewer comparatively.
  • 小林 健一, 岩渕 章久
    2000 年 20 巻 1Supplement 号 p. 67-70
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    The volume and complexity of data processed by today's image processing based measurements are increasing exponentially, these measurement technique demand ever increasing levels of calculation performance. From detailed studies of conventional cross-correlation program, most frequent multiplies and accumulates were converted to in-line assemble code for MMX technology. Four 16-bit words type operations were used to calculate 8-bit pixel images. After optimizing MMX assembler program, PIV calculation performance gains 4 times faster than non MMX algorithm.
  • 田中 源太郎, 岡本 孝司
    2000 年 20 巻 1Supplement 号 p. 71-72
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Accuracy for reconstructing algorithm used by Specklegram method was veryfied. Sine-curve was used as phantom, to calculate the deformation vector. 240x240 size surface was reconstructed using the vector. For each spacial frequency, surfase shape was reconstructed and the gain and phase-lag was obtained. The result showed good agreement with the amplitude of the sine-curve. Though, for the case with high spacial frequency, phase-lag has appeared.
  • 戸田 保幸, 鈴木 敏夫, 山藤 寅彦, 東 将広, 柴田 智, 長澤 武志
    2000 年 20 巻 1Supplement 号 p. 73-76
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    The velocity distribution in the nose of the gravity current on a small scale in laboratory is measured using PIV technique of Hiraku et. al. Neutral buoyancy particles are used for visualization of flow field. The lock-exchange flow in small tank is investigated for the fundamental study. The slightly higher density fluid with same density particles is released into another fluid and the gravity current is observed using the laser light sheet and high-speed video camera. The results show higher velocity region in the current than the nose velocity and the vortical flow at the shoulder part of the nose shape. The flow is also computed using 2D CFD code and compared.
  • 岡本 孝司
    2000 年 20 巻 1Supplement 号 p. 77-82
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Particle Image Velocimetry (PIV) is a superior technique to measure the whole flow field simultaneously. However, no standard evaluation tool has been established for the effectiveness and accuracy of the PIV systems. The activities on the PIV system standardization and popularization were summarized for recent years. Also, the new frontier of the PIV technology was reviewed, especially the high accurate PIV algorithms.
  • 川橋 正昭, 細井 健司, 平原 裕行, 大林 寛生, 佐藤 章弘, 山口 智弘, 北爪 三智男, 菅原 勉
    2000 年 20 巻 1Supplement 号 p. 83-86
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Flow visualization techniques can give us useful knowledge for understanding of complicated flow field or for practical design of fluid machinery and its elements. New techniques based on recent development of high-functional equipments and light source for visualization have possibility to resolve unsolved flow phenomena. Especially quantitative visualization methods using image processing technique, such as PIV, digital speckle method and LIF, are very useful to analyze complicated flow phenomena. A target of experimental analysis shown here is flow in a centrifugal fan in which 3D turbulent flow is induced. Aero-acoustic noise generation in it is related to the complicated flow field in the fan. The mechanism of noise generation at cut-off of scroll casing of the fan is investigated by using new technique and devices for visualization.
  • 村田 滋, 木澤 修一
    2000 年 20 巻 1Supplement 号 p. 87-88
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    This paper presents the PIV measurement results for the flow around a circular blade revolving in a circular channel. This flow is a model of the flow in a tea-spoon type pump, model that is employed to examine the effect of the motion of the circular blade on the flow characteristic. The flow visualization is carried out under the derotating observation with a reflecting prism that rotates at the half speed of that of a rotating object. The visualization images are digitized into a personal computer to obtain velocity vectors maps using a PIV algorithm, direct cross-correlation method. From the resulting velocity vectors maps, we estimate the time-averaged velocity, the velocity fluctuation and vorticity distributions around the circular blade.
  • 曹 兆敏, 水野 茂寛, 西野 耕一, 鳥居 薫
    2000 年 20 巻 1Supplement 号 p. 89-90
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    This paper reports an experimental study of high-pressure diesel fuel sprays in their initial stage of development. Diesel fuel is injected from a single-hole nozzle at an injection pressure of 50 MPa into a high-pressure vessel (2.0MPa). The internal structure of the spray is visualized with a laser-induced fluorescence (LIF) method. A direct cross-correlation PIV technique is applied to the spray images acquired with a double-pulsed illumination system. It is found that the droplets slightly upstream of the spray tip have substantially higher axial velocities than the droplets on the spray tip.
  • 道奥 康治, 藤田 一郎, 高橋 俊之, 藪本 圭一郎
    2000 年 20 巻 1Supplement 号 p. 91-94
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    A PTV analysis was performed to examine flow structure of a plume that is generated by buoyancy flux discharge imposed on an inclined boundary. Fine nylon particles of 60μm in diameter and 1.02 in a specific weight were used as tracers. The flow field was illuminated by a laser light sheet. Velocity profiles and streamlines from the PTV were compared with a theoretical solution that was obtained from a self-similarity flow analysis. They agreed quite well and the present visualization and the PTV were verified to be a useful measurement tool for such a slow and stratified flow. Performance of the tracer particles was rather satisfactory, despite it is usually difficult to keep tracer particles buoyantly neutral in a stratified flow system.
  • 橋爪 勇嗣, 藤沢 延行
    2000 年 20 巻 1Supplement 号 p. 95-98
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    The artificial images simulating the color variation of liquid crystal particles with temperatures have been constructed based on the numerical simulation data of thermal convection. The images reflect the experimental relationship of color to temperatures by liquid crystals and scattering of the color data. Based on the artificial images, the uncertainty analysis in temperature and velocity measurement by liquid crystal particles has been carried out and the optimum selection of parameters for the analysis is studied. The results agree approximately with those obtained by experiments.
  • 山下 稔弘, 山内 慎, 植村 知正, 小澤 守
    2000 年 20 巻 1Supplement 号 p. 99-100
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    By utilizing a new illumination technique, the gas-liquid interface can be clearly visualized without strong reflection at the surface. Velocities in the very close area to a bubble surface are measured using PTV technique. The velocity distributions along the surface of a rising bubble are compared with those of the inviscid fluid flow.
  • 武田 玄太郎, 藤沢 延行, 高野 剛
    2000 年 20 巻 1Supplement 号 p. 101-104
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    The flow around a circular cylinder in a uniform flow under the injection of oscillatory slit flow is measured by particle image velocimetry and the mechanism of flow control is studied. The measurement has shown that the flow properties change considerably with the forcing Strouhal number. The analysis of power spectrum indicates that the magnitude of fluctuating velocites at the natural frequency is surpressed by the control and corresponding area is reduced. The visualization study indicates that the roll-up vortices generated by the oscillatory slit flow develops along the shear layer and interacts with the vortices from the other side of the shear layer, which results in a weakening of the vortex shedding downstream.
  • 片山 智博, 高下 和浩, 峯村 吉泰
    2000 年 20 巻 1Supplement 号 p. 105-108
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    To understand flow phenomena, visualization is very important means because such phenomena can not be easily observed. So various visualization softwares have been developed. Recently, Java language is markedly taken notice of in the aspect of internet technology. Although Java has abundant graphical libraries, it is limited to two-dimensional graphics. On the other hand, Java3D, which has just developed as a three-dimensional graphical API of Java, can display three-dimensional graphics. In this paper, Java3D is applied to visualize the results obtained by CFD and investigated the possibility for the three-dimensional flow visualization.
  • 相対静止場に投入された固体粒子運動
    朱 〓, 野崎 勉, 李 輝, 柳田 博宣
    2000 年 20 巻 1Supplement 号 p. 109-112
    発行日: 2000/07/01
    公開日: 2010/01/21
    ジャーナル フリー
    A new type of solid-liquid separator, called Taper Drum Rotating Separator, was proposed by one of the authors. It can efficiently separate smaller particles from the solid-liquid two-phase mixture. For visualizing the motion of the particles in the solid-liquid separator, the experimental and numerical studies were carried out. It was found that the separating time of particle depended on the diameter of particle and drum. A diameter of particle that the separating time was the shortest existed. To explain the behavior of particle motion, the motion of particle was divided into two regions in our numerical simulation. They were the drag force governing region and centrifugal force governing region. The numerical results agreed with our experimental results.
  • ICE及びLOVA事象時の熱流動現象の可視化
    高瀬 和之, 小瀬 裕男, 久米 悦雄, 秋本 肇
    2000 年 20 巻 1Supplement 号 p. 113-114
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Numerical analyses on thermal-hydraulic characteristics in fusion reactors at accident events such as ICE (Ingress-of-Coolant Event) and LOVA (Loss-of-Vacuum Event) were carried out due to make sure adequacy of the safety design in ITER (International Thermonuclear Experimental Reactor) and the results were visualized numerically to enhance the understanding of physical phenomena during ICE and LOVA events. Relation between pressure rise and void fraction in ITER at the ICE event was obtained with a TRAC code. Air-ingress behavior into water was also clarified quantitatively with a CIP code. Furthermore, exchange flow and dust mobilization behavior through breaches on the fusion reactor during the LOVA event were analyzed based on equations of compressible fluid and dust momentum. It was found from the results of present numerical visualization that a suppression tank system which will be used in ITER is very effective and the ITER pressure suppression system during ICE and LOVA events is adequate.
  • NEC SX-4上での並列ベクトル処理性能
    武井 利文, 松本 秀樹, 村松 一弘, 土肥 俊
    2000 年 20 巻 1Supplement 号 p. 115-118
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    We have developed a concurrent visualization system RVSLIB (Real-time Visual Simulation Library). This paper shows the effectiveness of the system when it is applied to large-scale unsteady simulations, for which the conventional post-processing approach may no longer work, on high-performance parallel vector supercomputers. The system performs almost all of the visualization tasks on a computation server and uses compressed visualized image data for efficient communication between the server and the user terminal. We have introduced several techniques, including vectorization and parallelization, into the system to minimize the computational costs of the visualization tools. The performance of RVSLIB was evaluated by using an actual CFD code on an NEC SX-4. The computational time increase due to the concurrent visualization was at most 3% for a smaller (1.6 million) grid and less than 1% for a larger (6.2 million) one.
  • ウェーブレット変換の基礎と応用
    齋藤 兆古
    2000 年 20 巻 1Supplement 号 p. 119-124
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Discrete wavelets transform is introduced as one of the smart visualizing technologies. A simple sorting of the numerical data leads to a generalized n-dimensional wavelets transform. A relationship between the characteristic vector and wavelets base function is discussed.
    Simple examples demonstrate a usefulness of the wavelets for smart image visualizing technique in various fields, such as classical field theory, computer graphics and signal visualizing.
  • 高橋 広幸, 早野 誠治, 斎藤 兆古, 堀井 清之
    2000 年 20 巻 1Supplement 号 p. 125-128
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Modern electronics are always composed of the printed circuit board (PCB). When the currents on the PCB are visualized without decomposing the electronic devices, the testing and inspecting of the electronic devices are carried out in an extremely efficient manner.
    We have proposed 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. However, we have to measure a lot of point of magnetic field to utilize our method practically. This paper proposes one of the methodologies to reduce the computational resource by wavelet transform. Thus, we have succeeded to improve the cognition speed with high reliability.
  • 関島 大志郎, 早野 誠治, 斎藤 兆古
    2000 年 20 巻 1Supplement 号 p. 129-132
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    We have studied the visualization of the current distributions from the locally measured magnetic fields. In order to visualize the current distributions, it is intrinsically reduced into solving an ill-posed inverse problem. In most cases, the solutions of the ill-posed inverse problems tend to increase the noise, and the threshold operation is used for the noise reduction. Though this operation is strong noise reduction strategy, it needs a lot of trial and error and experiences for deciding the threshold value.
    In the present paper, we propose one of the methodologies of the noise processing. At first, we apply the generalized vector sampled pattern matching (GVSPM in short) method to visualizing the quasi-3D current vector distributions. Second, in order to extract the major current vectors, we apply the 3D vector wavelet transforms employing the several wavelet base function to the noisy current vectors. Consequently, in order to extract common current vectors among them, each of the current vectors was convoluted. Thus, we have succeeded in visualizing the quasi-3D current vector distributions without any threshold operation.
  • 若林 健一, 早野 誠治, 斎藤 兆古
    2000 年 20 巻 1Supplement 号 p. 133-136
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    A concept is introduced to extract the essential and distinct characteristics of images. A key idea is to introduce the eigen patterns, which represents the characteristics of images independent of the resolutions and position of images on the screen. The previous works have demonstrated that we have obtained significant results in the image cognition based on the eigen patterns. In this study, we try to compress the eigen patterns which compose a database by wavelet transform, and report a relationship between the cognition rate and the extent of compression.
  • 妹尾 勇, 早野 誠治, 斎藤 兆古
    2000 年 20 巻 1Supplement 号 p. 137-140
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    As is well known, voice cognition system of the personal computers becomes one of the popular command input methodologies. However, it is still remaining problem, which requires a hard training in order to build up a reliable voice database. Most of the voice cognition methods are based on a simple correlation analysis between the input and database voices. This leads to a relatively low cognition rate when using a poor trained database system. To overcome this difficulty, we are now developing a new voice cognition methodology, which cognizes an input voice as a solution of an inverse problem. Our inverse methodology requires each of the characteristic patterns representing essential feature of the single pronunciation. In the present paper, we describe that the characteristic patterns representing essential feature of the single pronunciation are derived by means of the simple Lissajous's diagram after the threshold operations. Using the database containing the characteristic patterns, an ill-posed linear system of equations for an each pronunciation input is established. Simple least squares leads to a good approximate solution of this system. Thus, we have succeeded in cognizing the single pronunciation. Further, we have tried to compress the characteristic patterns by means of the discrete wavelet transform. As a result, it is revealed that the Daubechie's 2nd order base function makes it possible to reduce the database into 25% quantity.
  • 遠藤 久, 早野 誠治, 齋藤 兆古
    2000 年 20 巻 1Supplement 号 p. 141-144
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    A method of image generation by means of partial differential equations has been proposed. It is possible to obtain any animations as the solutions of image Helmholtz equations introduced in this paper. The computer animations are always composed of several images as frames. Thereby, generating such an animation containing color information is essentially required too many memories to reduce the image construction time. We apply the wavelet transform to the system equation derived from image Helmholtz equation in order to compress the animation information. As a result, we have succeeded in reducing the data quantity for generating an animation. Thus, our method has capability of providing the information technology with a faster computer communication.
  • 松山 佐和, 小口 雄康, 松山 志保, 斎藤 兆古, 國井 利泰
    2000 年 20 巻 1Supplement 号 p. 145-148
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    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 data. In the present paper, we have tried to shrink and enlarge the wind vector image data by the three dimensional discrete wavelets transform. Several examples demonstrate the usefulness of our new method to work out the graphical communication tools.
  • 原 利次, 工藤 祐督, 松本 欣和, 廣瀬 治男, 清川 晋
    2000 年 20 巻 1Supplement 号 p. 149-152
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Change of radial temperature distributions in a baked sweet potato and roasted fish were visualized by a thermography camera. The temperature distribution in the heated food was same as calculated value by unsteady heat transfer theory, when the temperature of the food was lower than 65 degree C. When the food was heated up above 65-70 degree C, the temperatures was different from calculated value. The temperature distribution at the outer part of the food was steeper than the predicted value. On the other hand, temperature distribution at the inner part of the food was flattened than the original value. It was thought that the outer part of the food was baked and acted a thermal insulation wall, and that heat was transferred rapidly by vapor transmission through the cells in the food at the center part of the food.
  • 吉沢 大輔, 椎名 保顕, 稲垣 照美
    2000 年 20 巻 1Supplement 号 p. 153-156
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Effect of metal wire immersed in cylindrical capsules on melting of solid phase by natural convection was studied by flow visualization technique. Experiment was compared with numerical analysis. Melting time agreed with the numerical results obtained by the use of empirical correlation of natural convection in the capsules. Metal wire decreases the surface temperature of the capsules and suppresses natural convection in the capsules. Increase in effective thermal conductivity due to metal wire reduces melting time of the phase change fluid. The shape of the solid liquid boundary became more concentric by inserting the metal wire.
  • 奥野 武俊, 上田 幸蔵
    2000 年 20 巻 1Supplement 号 p. 157-160
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    It is known that a dolphin can swim with high speed than that of normally estimated. One of the reasons would be of small frictional resistance owing to a compliant surface. However, its phenomena has not been investigated clearly yet. This paper describes the attempt to measure the surface deformation of the complaint wall in a turbulent flow. Since the displacement of the wall would be very small, a new image measurement method has been developed using More's fringe technique and the so-called spatio-temporal derivative method. The result shows that the compliant surface is clearly vibrated due to the turbulence of flow.
  • 藤代 一成
    2000 年 20 巻 1Supplement 号 p. 161-162
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Volume visualization has served as an indispensable tool to explore the inner structures and complex behavior of volumetric objects embedded in large-scale sampled or simulated 3D datasets. However, the rapid increase in data size makes it difficult for us to sufficiently adjust visualization-related parameters for generating informative images. In order to compensate the lack of interactivity and provide the user with the serendipity, this keynote paper exploits the potential of a novel visualization concept, termed volume data mining.
  • 竹島 由里子, 藤代 一成, 山口 裕美, 高橋 成雄
    2000 年 20 巻 1Supplement 号 p. 163-166
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    This paper takes advantage of a 3D field topology analysis for automating transfer function design aiming at volume data mining. The conventional Reeb graph-based approach to describe the topological features of 3D surfaces is extended to capture the topological skeleton of a volumetric field. Based on the analysis results, which are represented in the form of hyper Reeb graph, we propose two principles to design appropriate color/opacity transfer functions for direct volume rendering. Feasibility study of the present methodology is performed with a large scale 4D simulated dataset from atomic collision research. In analyzing the dynamic volume data, it turned out to be effective to use transfer functions designed appropriately at each time step. The basic idea of another approach with a higher order hyper Reeb graph to dynamic volume data mining is also discussed.
  • 金田 和文, 山下 英生
    2000 年 20 巻 1Supplement 号 p. 167-170
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    In volume data exploration, it is necessary to visualize the volume data in conjunction with a pseudocolor display, and to change a transfer function based on the purpose of the observation. This paper proposes a fast volume rendering method when a transfer function undergo change. The proposed method calculates a histogram of volume data along a cast ray, and the histogram is wavelet-transformed in a pre-process. The rendered image for an arbitrary transfer function is generated by multiplying a series of coefficients of basis functions, after the specified transfer function is also wavelet-transformed. We also propose a method for displaying iso-surfaces by making use of a wavelet transformation. Several examples of the volume data visualization demonstrate the usefulness of the proposed method for observing unknown volume data.
  • 小山田 耕二
    2000 年 20 巻 1Supplement 号 p. 171-174
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    In this paper, we propose a technique for visualizing volume datasets which are generated on memories of distributed computers using a PC-based volume rendering system. When we wish to monitor a on-going simulation on distributed computers, we often gather volume datasets on a graphics workstation and visualize an isosurface from these datasets. When the size of the generated isosurface is very large and is comparable to the size of the pixel, it requires much time to render them. To solve this problem, we choose a volume rendering method so that we do not use intermediate geometries such as isosurfaces. This approach is promising because a PC-based volume rendering board which can render a 2563 volume dataset at a rate of 30 frames per second has been commercialized recently. We will develop a system which monitors a large scale simulation by using the board as a voxel memory which distributed computers share.
  • 周藤 安造, 上野 滋, 鈴木 雅隆
    2000 年 20 巻 1Supplement 号 p. 175-178
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    In general, three dimensional display has been fond to be more effective in the evaluation of bone or organs with complex structure.
    Multi CT or MRI images and stereoscopic X-ray images inherently contain three dimensional data. Although 3D display has a wide range of potential application, it is basically applicable to the fields of diagnosis and therapy.
    3D image display has been found of the location and structure of lesions and their surrounding structures both before and after therapeutic intervention.
    In this paper, volume rendering is introduced as one approach of recent typical three dimensional display algorithms. First, we classify categories of rendering and describe fundamental theory for volume rendering.
    Next, the volume rendering system, developed under Windows, is introduced. Each process step is shown as unique algorithm, easily and concretely.
    Last, clinical effectiveness is evaluated by corporation with remote clinical institutes using Internet system.
  • 炭 親良
    2000 年 20 巻 1Supplement 号 p. 179-180
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    We have developed the ultrasonic (US) strain measurement-based shear modulus reconstruction technique. Briefly, we developed the iterative US rf-echo phase matching method using successively acquired rf-echo data frames for measuring strains generated in vivo in soft tissues due to spontaneous heart motion and/or externally applied pressures. Moreover, we developed the method using the measured strain data for stably reconstructing the globally relative shear modulus distribution with respect to reference shear moduli. As the elasticity of the soft tissues irreversibly changes by heating, we propose that the developed shear modulus reconstruction technique is used as a monitoring technique for the effectiveness of thermal therapy. Particularly in this report, we applied the reconstruction technique to interstitial RF electromagnetic wave thermal therapy. To verify the feasibility we conducted in vivo experiment using a fresh calf liver. The pair of needle electrodes with the diameter of 2 mm were inserted into the liver tissue and the electric current with the frequency of 13.56 MHz was injected. During heating the tissues, we collected rf-echo data frames containing the heated region. Obtained reconstructions could satisfactorily visualize the expansion of heated regions. This result indicates that it has a high potential value as a practical tool for monitoring the effectiveness of thermal therapy.
  • ヒト脳を例として
    鈴木 雅隆, 周藤 安造
    2000 年 20 巻 1Supplement 号 p. 181-184
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    In neuroanatomy, observation of a large field is indispensable. However, magnification and a field of vision of an optical microscope are in inverse proportion. So we acquisition image data of a Z axis in addition to high magnification and a wide field of vision. In this methods, we can make volume data in a super wide field. We did these methods using ready-made software. As a result, focus image of the humans cerebrum and a stereo image were provided. These methods will do big development of study in neuro-anatomy.
  • 周藤 安造, 稲田 隆俊, 吉村 誠人, 上野 滋
    2000 年 20 巻 1Supplement 号 p. 185-188
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    In order to efficiently develop image analysis and visualize software of multi-dimensional biomedical information such as x-ray CT and MRI, we construct integrated development system under Windows 98.
    For the purpose, imaging software library and multi-dimensional biomedical image database are arranged as the integrated development system by using Ms-Access. All software are developed by object oriented language, Delphi.
    Object oriented language is effective for modification and improvement of program. We develop dynamic studying algorithms, such as animation display, organ functional imaging for nuclear image and volume rendering software for x-ray CT images.
    In order to evaluate the effectiveness of the various clinical imaging and the integrated development system, we open the various clinical software and algorithm on our homepage.
  • 文沢 元雄, 中川 隆志
    2000 年 20 巻 1Supplement 号 p. 189-192
    発行日: 2000/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    Workload is one of the key factors with respect to reducing the human error at the operation in the commercialized nuclear power plants (NPP). In order to produce a high quality design of human machine interface (HMI), the evaluation and simulation method is developed to analyze operator's workload and the method adopted the model proposed by Reason. The workload such as length of the eye movement and moving length of the operators were visualized in CRT image during the simulation, then recorded as movie-file.
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