IEEJ Transactions on Electronics, Information and Systems
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
Volume 123 , Issue 10
Showing 1-32 articles out of 32 articles from the selected issue
Special Issue on "Waste Utilization Technologies and Environment Conservation System Assessments"
Special Issue Paper
  • Kiyoshi Dowaki, Shunsuke Mori, Chihiro Fukushima, Noriyasu Asai
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1670-1679
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    This paper describes on a comprehensive economic analysis concerning biomass gasification systems. In Japan, promoting biomass energy systems in domestic area comes to be expected recently. However, there are some problems in achieving this project. The costs for plant building are very expensive comparing with conventional ones. Accordingly, the unit costs of electricity increase up to as high as other environmental energy systems.
    In this paper, biomass energy systems using woody biomass are proposed from the viewpoints of successful environmental business. The biomass integrated gasification combined cycle (BIGCC) plant by Independent Power Producer and biomass gasification co-generation (BGCGS) plant in the sawmill or the asphalt-concrete production factory will have opportunities to be implemented in the near future. Our analysis concludes that the systems proposed in this paper provide the following outcomes with subsidies: (1) the generating cost in BIGCC becomes from 15.1 to 36.6 yen/kWh, (2) the generating cost in BGCGS becomes from 2.6 to 32.2 yen/kWh, (3) the cost reduction of products in BGCGS in asphalt factory comes to about 60 million yen per year.
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  • Hirokazu Shima, Ryuji Matsuhashi, Yoshikuni Yoshida, Hisashi Tateyashi ...
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1680-1687
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    Most of demolished concrete is recycled as road subbase, but its generation is expected to increase rapidly and exceed the demand of road subbase in a near future. To promote the recycling of concrete, the technology to produce high quality recycled aggregate by the heating and rubbing method has been developed. In this method, demolished concrete is heated up to about 300°C in a heater to make cement paste brittle with its dehydration. The heated concrete is then rubbed in two mills to recover the recycled aggregate, while the paste is removed from the surface of aggregate and collected as cement fine powder.
    In this method, much energy is consumed to heat and rub concrete; however, the cement fine powder is utilized for a soil stabilizer and cement raw materials, so that the environmental load is reduced in cement manufacturing. The life cycle analysis of the recycled aggregate is carried out to evaluate this technology. As a result, the life cycle CO2 is a negative value because the deduction of CO2 emission in cement manufacturing by the powder is much large. This technology is proved to be very effective to reduce CO2.
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  • Yoshinori Kobayashi, Kazuhito Haruki
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1688-1694
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    There are two well-known LCA inventory analysis methods, which are called the process analysis and the I-O analysis methods. In this paper, the hybrid method, which combines these two analysis methods, is described as a mathematical form. There are two approaches of the enlargement of the hybrid method based on I-O analysis to compensate the weak points of these methods. One approach is to collect and use more foreground inventory data of the LCA target system and the other is to make background inventory data more precise. The LCA study of a refrigerator is also conducted to indicate usefulness of the hybrid method.
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Paper
  • Nobuo Haneji, Phonekeo Chanthamaly, Shigenobu Mouri
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1695-1699
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    Liquid phase deposition (LPD) is the method to deposit SiO2 films on the substrates at room temperature in the super-saturated fluorosilicic acid (H2SiF6) solution. When the SiO2 films are directly deposited on the Si substrates, which are treated with diluted HF to remove the native oxide, the characteristics of the the SiO2/Si interface are poor, because the surface Si atoms are terminated and covered with H atoms. Low temperature (30—500°C) annealing in O2 was found to be effective to improve the interface characteristics, and also the breakdown characteristics. This low temperature annealing in O2 ambient is useful without losing the merit of low temperature process in the liquid-phase deposition method, when the deposited SiO2 films are used as the gate insulators in Si MOS FETs.
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  • Kei Eguchi, Toru Tabata, Hongbing Zhu, Fumio Ueno, Ichirou Oota, Takah ...
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1700-1705
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    In this paper, a ring-type SC DC-DC converter with novel bootstrapped gate transfer switches is proposed. The bootstrapped gate transfer switches are used to achieve higher efficiency. In the proposed bootstrap circuit, maximum voltage of the power converter is charged to a capacitor via maximum circuits constructed with diodes. By connecting the charged-capacitor between the gate terminals of power-switches and the output terminal of the maximum circuit, the bootstrap circuit avoids the threshold voltage drop of power-switches. Concerning the DC-DC converter designed by a 1.2 μm CMOS technology, SPICE simulations are performed to investigate the characteristics of the circuit. The SPICE simulations show that the efficiency of the DC-DC converter with proposed bootstrap circuits is more than 90 % when the output load Ro satisfies Ro > 200 Ω. When Ro = 100 Ω, the proposed circuit can improve efficiency up to 8.7 % of a conventional converter. The validity of the circuit design for the bootstrap circuit is also confirmed by experiments.
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  • Toshitaka Shidara, Yonglong Jin, Yoshiyuki Uchida, Kenzo Kojima, Asao ...
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1706-1713
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    Vanadyl-phthalocyanine (VOPc) thick films were prepared by an organic molecular beam deposition (OMBD) method on KBr substrate. The morphologies and nonlinear optical properties of VOPc films were investigated with VIS/UV spectra, the incident angle dependence of third harmonic (TH) intensity measured by Marker fringe, SEM, and AFM images. The morphology of VOPc thick film prepared at the substrate temperature of 200°C is a pseudoepitaxy. Cracks and wrinkly parts on the film surface are observed from SEM and AFM images. The VOPc thick film exposed for 25 and 50hrs to 1.8 atm organic gas changes from pseudoepitaxy to epitaxy. Cracks and wrinkly parts on the film surface disappear due to the molecular diffusion during the gas treatment. It depends upon time exposed in organic gas. A VOPc thick film treated for 75hrs in 1.8 atm organic gas almost perfectly changes from pseudoepitaxy to epitaxy because it is impregnated with organic gas.
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  • Tetsuo Fukuchi, Takuya Nayuki, Takashi Fujii, Koshichi Nemoto
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1714-1720
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    A laser radar system using Raman and Mie scattering for simultaneous measurement of water vapor and aerosols was developed. This system can detect Raman scattering from atmospheric nitrogen (N2), oxygen (O2), or water vapor (H2O), as well as Mie-Rayleigh scattering for a laser wavelength of 280 nm. Using this system, vertical profiles of the water vapor mixing ratio were measured with about 10% accuracy for height 30-1500 m using Raman scattering from H2O and N2. The correction due to differential absorption by O3 was found to be <3%. Simultaneous measurement of the water vapor mixing ratio and Mie backscatter coefficient showed that uncondensed and condensed water vapor can be identified by comparing the spatial profiles of the water vapor mixing ratio and Mie backscatter coefficient. In addition, the average O3 concentration was obtained using Raman scattering from atmospheric N2 and O2.
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  • Ramaswamy Palaniappan, Paramesran Raveendran, Shogo Nishida
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1721-1727
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    In this paper, Principal Component Analysis (PCA) is used to reduce noise from multi-channel Visual Evoked Potential (VEP) signals. PCA is applied to reduce noise from multi-channel VEP signals because VEP signals are more correlated from one channel to another as compared to noise during visual perception. Emulated VEP signals contaminated with noise are used to show the noise reduction ability of PCA. These noise reduced VEP signals are analysed in the gamma spectral band to classify alcoholics and non-alcoholics with a Fuzzy ARTMAP (FA) neural network. A zero phase Butterworth digital filter is used to extract gamma band power in spectral range of 30 to 50 Hz from these noise reduced VEP signals. The results using 800 VEP signals give an average FA classification of 92.50 % with the application of PCA and 83.33 % without the application of PCA.
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  • Yoshiharu Koya, Isao Mizoshiri, Kiyoaki Matsui, Takashi Nakamura
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1728-1734
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    The arteriosclerosis is on the increase with an aging or change of our living environment. For that reason, diagnosis of the common carotid artery using echocardiogram is doing to take precautions carebropathy. Up to the present, several methods to measure stiffness parameter of the carotid artery have been proposed. However, they have analyzed at the only one point of common carotid artery.
    In this paper, we propose the method of analysis extended over a wide area of common carotid artery. In order to measure stiffness parameter of common carotid artery from echocardiogram, it is required to detect two border curves which are boundaries between vessel wall and blood. The method is composed of two steps. The first step is the detection of border curves, and the second step is the calculation of stiffness parameter using diameter of common carotid artery. Experimental results show the validity of the proposed method.
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  • Yohdoh Kameo
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1735-1744
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    Traditionally Extended Kalman Filter has been proposed and studied for the acquisition of a digital carrier signal. However, this technique imposes a heavy load on the processor. And high performances cannot be expected for the poor linearity, in most cases. To overcome these problems, this paper shows that one can use a simple, purely linear Kalman Filter which consists of two states variables - phase and frequency. This new technique selects the carrier phase as the input to the filter, instead of a pair of orthogonal signal amplitudes. The filtering logic is made up of only 4 additions and 2 multiplications. The results of both simulations and experiments show that this filter can acquire the carrier signal within 10 symbols with a probability of 98 % during the initial phase, even when the frequency offset is as large as 20 % of the symbol rate frequency at C/N=6dB. In the steady state, the measured BER is close to the theoretical values. While delivering a similar performance mentioned above, this filter can operate even when the carrier frequency deviates from the expected figure.
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  • Takaya Yuizono, Kousuke Hara, Shigeru Nakayama
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1745-1752
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    A web-based distributed cooperative development environment of sign-language animation system has been developed. We have extended the system from the previous animation system that was constructed as three tiered system which consists of sign-language animation interface layer, sign-language data processing layer, and sign-language animation database. Two components of a web client using VRML plug-in and web servlet are added to the previous system. The systems can support humanoid-model avatar for interoperability, and can use the stored sign language animation data shared on the database. It is noted in the evaluation of this system that the inverse kinematics function of web client improves the sign-language animation making.
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  • Tsunemasa Saiki, Yoichi Kitagawa, Akihiro Hayashi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1753-1759
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    Although word-processed sentences are easy to read because of the use of standardized character fonts and their orderly arrangement, these sentences lack a writer’s individual style and thus fail to convey the writer’s true message. Recently in response to this, word-processed sentences with personal fonts are desired. On the other hand, distinguished calligraphers decide character arrangements in consideration of the character structures. In order to create word-processed sentences with personal fonts, we measure character arrangements and structures, and investigate the relationship between them by means of multiple-regression analysis. We propose based on the results a new printing method of word-processed sentences with personal fonts. When the method is used, character arrangements of word-processed sentences with personal fonts resemble handwritten sentences. Word-processed sentences made by this method give readers a better feeling than those made by the traditional one.
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  • Fumihiko Saitoh
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1760-1767
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    This paper proposes a thresholding technique to extract characters from the background in a gray-scaled image with shading or highlights. The method can set a threshold automatically without any external parameters. The method uses the gray-levels of the plane-edge pixels that are located on the both sides of the general edge pixels. Because these plane-edge pixels are located near the gray-scaled planes compared with the general edge pixels, the gray-levels of the plane-edge pixels are supposed to be stable to the change of the position and the pose of an object to be extracted. The threshold is obtained from the averaged gray-levels of the plane-edge pixels with the maximum frequency of the plane-edge strength. The experimental results show that the characters were extracted clearly in the binary image by the proposed method in comparison with in the binary image by the discriminatory analysis method.
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  • Toshio Modegi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1768-1775
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    The MIDI interface is originally designed for electronic musical instruments but we consider this music-note based coding concept can be extended for general acoustic signal description. We proposed applying the MIDI technology to coding of bio-medical auscultation sound signals such as heart sounds for retrieving medical records and performing telemedicine. Then we have tried to extend our encoding targets including vocal sounds, natural sounds and electronic bio-signals such as ECG, using Generalized Harmonic Analysis method. Currently, we are trying to separate vocal sounds included in popular songs and encode both vocal sounds and background instrumental sounds into separate MIDI channels. And also, we are trying to extract articulation parameters such as MIDI pitch-bend parameters in order to reproduce natural acoustic sounds using a GM-standard MIDI tone generator.
    In this paper, we present an overall algorithm of our developed acoustic signal analysis tool, based on those research works, which can analyze given time-based signals on the musical temperament scale. The prominent feature of this tool is producing high-precision MIDI codes, which reproduce the similar signals as the given source signal using a GM-standard MIDI tone generator, and also providing analyzed texts in the XML format.
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  • Bingchen Wang, Sigeru Omatu, Toshiro Abe
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1776-1782
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    In this paper, we propose a new method of evaluating the quality of a transmission device according to the acoustic data by using the genetic algorithm (GA). We consider that the “spectrum average” and the “frequency variation” reflect the characteristic of acoustic data. In this paper, we first extract the “spectrum average” and the “frequency variation” from the acoustic data of operating transmission device. Then we use the GA to select the “significant frequencies” and determine the boundary between good and no good products. The experimental results show that the proposed method can perform the quality evaluation of transmission devices successfully.
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  • Ali Ahmadi, Sigeru Omatu, Toshihisa Kosaka
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1783-1789
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    This paper addresses the reliability of neuro-classifiers for paper currency recognition. A local principal component analysis (PCA) method is applied to remove non-linear dependencies among variables and extract the main principal features of data. At first the data space is partitioned into regions by using a self-organizing map (SOM) clustering and then the PCA is performed on each region. A learning vector quantization (LVQ) network is employed as the main classifier of the system. By defining a new algorithm for rating the reliability and using a set of test data, we estimate the reliability of the system. The experimental results taken from 1, 200 samples of US dollar bills show that the reliability is increased up to 100% when the number of regions as well as number of codebook vectors in the LVQ classifier are taken properly.
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  • Kouichi Miyazaki, Zi-Jiang Yang, Shunshoku Kanae, Kiyoshi Wada
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1790-1797
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    This paper considers the position tracking problem of a popular magnetic levitation system in the presence of modeling errors due to uncertainties of physical parameters. The recently developed dynamic surface control (DSC) technique is modified and applied to the system under study, to overcome the problem of “explosion of terms” associated with the backstepping design procedure. Input-to-state stability (ISS) property is ensured by the robust nonlinear damping terms whereas the ultimate control error bounds are made sufficiently small by the adaptive laws. Experimental results are included to show the excellent position tracking performance of the designed control system.
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  • Sato Kazuya, Honda Hideki, Hayakawa Aki, Watanabe Keigo
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1798-1805
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    In this paper, we present a feedforward control system using adaptive PI strategy for a positioning mechanism with stand. Due to the rapid motion of a moving table, the vibration phenomena in a stand may be induced by the reaction force of a motion of a moving table. However, in the previous researches, the dynamics of the stand does not consider. To cope with this problem, we present the dynamic model of the positioning mechanism with stand using linear motor and apply a feedforward control method with adaptive PI control strategy to the system. Experimental results demonstrate the effectiveness of our method, compared to the conventional research. Especially, the efficiency of an adaptive PI control strategy to the actual system is shown.
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  • Ken-ichi Iida, Yoshitaka Nakata, Toshio Hira, Takuya Kamano, Takayuki ...
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1806-1812
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    In this paper, an application of genetic algorithm for generation of evolutionary initial poses of a quadrupedal robot which reduced degrees of freedom is described. To reduce degree of freedom, each leg of the robot has a slider-crank mechanism and is driven by an actuator. Furthermore we introduced the forward movement mode and the rotating mode because the omnidirection movement should be made possible. To generate the suitable initial pose, the initial angle of four legs are coded under gray code and tuned by an estimation function in each mode with the genetic algorithm. As a result of generation, the cooperation of the legs is realized to move toward the omnidirection. The experimental results demonstrate that the proposed scheme is effective for generation of the suitable initial poses and the robot can walk smoothly with the generated patterns.
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  • Hiroshi Igarashi, Masayoshi Kakikura
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1813-1821
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    A legged walking robot is able to not only move on irregular terrain but also change its posture. For example, the robot can pass under overhead obstacles by crouching. The purpose of our research is to realize efficient path planning with a quadruped robot. Therefore, the path planning is expected to extended in three dimensions because of the mobility. However, some issues of the quadruped robot, which are instability, workspace limitation, deadlock and slippage, complicate realizing such application. In order to improve these issues and reinforce the mobility, a new static gait pattern for a quadruped robot, called TFG: Trajectory Following Gait, is proposed. The TFG intends to obtain high controllability like a wheel robot. Additionally, the TFG allows to change it posture during the walk. In this paper, some experimental results show that the TFG improves the issues and it is available for efficient locomotion in three dimensional environment.
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  • Hiroki Tamura, Zheng Tang, Masahiro Ishii
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1822-1829
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    Constraint satisfaction problem consists of the combination of some constraints, and it is a very difficult problem. The neural network is used as a method of solving constraint satisfaction problems. In this research, we proposed a method of solving constraint satisfaction problems by neural network having self-feedback. The feature of this proposed method is simplifying constraint satisfaction problems. It becomes easy to search an optimum solution by this proposed method. This proposed method was applied to N-queen problem and four-color problem which are constraint satisfaction problems. From Simulation result, this proposed method can solve the N-queen problem and four-color problem at high speed and high performance.
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  • Hattori Motonobu, Fukui Atsushi, Ito Hiroshi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1830-1838
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    Two-step Morphological Associative Memories (MAMs) using kernel patterns have a lot of desirable features. It is, however, very difficult to decide kernel patterns when the number of training patterns to be stored is large and when training patterns have no unique feature bits. In this paper, we propose a novel method of constructing kernel patterns for the two-step MAMs. We derive the proposed method by examining the relation between characteristics of kernel patterns and outputs of MAMs. The proposed method has the following features: (1)It can construct morphological memory from original patterns; (2)It can converge very fast because it does not require trial and error to decide kernel patterns; (3)It keeps the inherent features of MAMs such as unlimited storage capacity, robustness for both erosive and dilative noise, and so on. Computer simulation results show that the proposed method is more than 10 million times faster than the conventional method using trail and error.
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  • Kentaro Morishita, Eitaro Aiyoshi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1839-1846
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    This paper presents new model that is called a fuzzy connected neural network. The fuzzy connected neural network is expected to be better approximation and converge faster than the conventional neural network. When input-output teaching data with non-linearity are widely over a range, it is necessary to increase the hidden-layer’s neurons and neural parameters because of the simple structure of neural networks. So We propose to divided the input data space into plural sub-area in order to approximate the divided teaching data with a neural network specially prepared on the each divided space. The plural neural networks are connected with fuzzy membership functions to construct the fuzzy connected neural network on the whole input space. Plural neural networks are called local neural networks. Because each local neural network dose not learns all teaching data, it is expected that the surface of the square error function is more monotonous than it in the conventional neural network, and the learning problem of each local neural network can be solved more easily. These points give fuzzy connected neural network advantages over the conventional neural network, which needs repeated trial and error to tune weights. Finally this paper shows the ability of the proposal model.
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  • Takahiro Tsukishima, Masahiro Sato, Hisashi Onari
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1847-1857
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    The application of parallel computing system to MRP (Material Requirements Planning) is essential to achieve a real-time demand forecasting for a whole Supply Chain which consists of Multiple enterprises near future. The MRP using loosely connected multi-computer system is examined here. New methods of synchronization, load balancing and data access are required to keep high parallel efficiency increasing PE’s(Processing Elements). In this paper load balancing and data access methods are proposed. The prototype system can keep 96% parallel efficiency for the MRP with 120, 000 items on the 6 PE’s structure and can be robust against unbalanced load. The processing speed increases in liner fashion.
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  • Yang Jianhua, Yasutaka Fujimoto
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1858-1864
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    A relative priority approach is proposed to solve dynamic scheduling problem for flow shop problem in this paper. Two neighbor jobs’ relationship is represented by a relative priority, which implies permutation obstacle between them. An algorithm is developed to calculate relative priority matrix on jobs and a near-optimal result can be obtained with the calculation iteration of relative priority matrix. A printed circuit board production line, which is composed of 31 works, is used to demonstrate the efficiency of proposed approach. It shows that an excellent final sequence can be obtained while initial sequence is derived from rule-based result.
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  • Kimiyoshi Machii, Yoshinori Endo, Shigeru Matsuo, Katsuaki Tanaka, Mic ...
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1865-1873
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    This paper describes our off-board car navigation system. Our off-board car navigation system has (1) a center to provide navigation functions using the latest maps and POI (Point Of Interests) through the internet; and (2) a more compactly sized client terminal compared to conventional on-board systems. We evaluated the system. The concept of the system was evaluated as acceptable, but some problems that need solutions were identified.
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  • Hiroshi Fukuda, Teruo Negishi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1874-1883
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    This paper deals with an algorithm in a multisignal method instead of the binary notation system that has been used in the computer information processing. The remarkable feature in this method is to be able to express a plural meaning or different meanings in just one bit. A bit in the proposed method can serve as, so to speak, an extended bit by itself. So hereafter we call it a “mut, ” a newly coined word for a multiple digit. With a mut, a multisignal is produced, which belongs to one of the following three systems of the multisignal method: the fixed multi-notation system, the selective multi-notation system, and the general multisignal system.
    Consequently, this algorithm may be applied to many aspects of the multimedia. Moreover, using this system, a large quantity of expressions can be made with high speed, and the programming can be done easily.
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  • Hironori Oka, Tetsuya Maruta, Yoshitomo Ikkai, Norihisa Komoda
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1884-1891
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    In order to define a SC (supply chain) simulation model efficiently, we propose a multi-functional modeling method, and develop a SC modeling and simulation tool, to which is installed the modeling method. In the proposed method, because a whole SC model is divided into 5 kinds of partial model that have different description each other from a view of a function in a SC, a whole SC model can be defined in a short time with a small number of components. In order to evaluate the efficiency to define/change a SC model and the accuracy of the simulation, the developed tool was applied to virtual and real SC. As a result, the time to model was 1/28 and the number of components was 1/8 compared to ones with an general simulation tool, and the error of the number of inventories output by the developed tool was 0.3 % and one of the deadline meet rate was 0.4 points compared with the real data.
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  • Atsushi Takeuchi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1892-1900
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    I believe that the software design documents are one of the most important infrastructure of the software developments process. Because the software design documents ensure the communications between the members of software development team. So I develop the elaboration method to make the design documents not to be misunderstood.
    In this paper I will propose the model based elaboration method for the software design documents ( MESOD). I construct the elaboration model based on “Characteristics of a good Software Requirements Specifications(SRS) of IEEEStd830-1993”, in order not to fall out the important elaboration check items. And I formulate the elaboration procedure for MESOD can provide abilities of execution, detection of defects and efficiency. To confirm the abilities of execution, detection of defects and efficiency of MESOD, I practice the elaboration examination. 3 students elaborate 5 requirements specifications documents. From these experiments, I can affirm that MESOD has abilities of execution, detection of defects and efficiency.
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  • Hong Zhang, Masumi Ishikawa
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1901-1907
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    In this paper we propose a novel approach to static inverse optimization problems with quadratic constraints by learning of neural networks for interpreting real-world data. This proposal has an advantage in that marginal rates of substitution change smoothly in contrast to the case of static inverse optimization with linear constraints. Based on this characteristic, more accurate interpretation of data by static inverse optimization becomes possible. To evaluate the effectiveness of the proposed method, we solve static inverse optimization problems with quadratic constraints using artificial data. We also propose a method to generate quadratic constraints from given data.
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Letter
  • Bancha Charumporn, Michifumi Yoshioka, Sigeru Omatu
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1908-1909
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    Nowadays, various metal oxide gas sensors (MOGSs) are widely combined and used as an electronic nose (EN). Most of the ENs always use only single feature (e.g. peak signal, average signal of saturation stage) from each MOGS without considering the signals before reaching the saturation points. In this letter, we increase the ability of an EN to identify smells that yield nearly the same saturation points without increasing the number of MOGS by using the information from the time series signals of MOGSs during absorbing the tested odors. The results from multivariate analysis show perfectly classification in all tested odors.
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  • Noriaki Suetake, Masanori Togashi
    Type: Others
    Subject area: Others
    2003 Volume 123 Issue 10 Pages 1910-1911
    Published: 2003
    Released: May 28, 2004
    JOURNALS FREE ACCESS
    We propose a new multi-level error diffusion method that realizes half-toning with high quality. By using fuzzy inference the proposed method decreases dissimilar textures, which are the cause of the low image quality and obtained by a conventional method, around middle quantization levels. In this letter, we apply the proposed method to several digital images. And the simulation results show that the proposed method is superior to the conventional method.
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