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Volume 34, Issue 7
Displaying 1-32 of 32 articles from this issue
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Shinichi MIYAMOTO1998 Volume 34 Issue 7 Pages 653-659
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, we present a PID controller design based on H∞-loop shaping method and LMI optimization method. Since the order of the conventional H∞-loop shaping controller is as high as the plant order, the method can not be applied to PID control design directly. However, the robust stability problem used in H∞-loop shaping method can be modified to one block problem with a right inverse graph K of the controller and a parameter Q. Then controllers with fixed structure can be designed by using LMI optimization. Furthermore, this method can be extended to a design problem of controllers with fixed poles which is necessary for PID design. Major advantage of our design method is that robust stability as well as nominal stability is guaranteed at design stage which is difficult with classical PID designs such as the Ziegler-Nicholas method. Furthermore, the design can be applied to multi-input multi-output plants and it can be extended to simultaneous control design for multiple plants.View full abstractDownload PDF (1115K) -
Yuichi CHIDA, Takashi SHIGEMASA1998 Volume 34 Issue 7 Pages 660-665
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, controller order reduction methods based on model matching of loop transfer function's frequency response are proposed. By these methods, a PID controller can be obtained by reducing a high order controller, which is designed by H∞ control or μ synthesis, etc. Since the controller order reduction is performed such that the frequency response of the loop transfer function matches to a high order controller's loop transfer function in cut-off frequency band, the reduced order controller provides almost the same performance as the high order controller in considerable cases. The methods have very small computation effort because the reduced order controller is derived using the least squares method, and the methods could be applied for multivariable controller design.View full abstractDownload PDF (1440K) -
Tetsumi HARAKAWA, Ritaka NAKAMURA, Ryouichi KUROSAWA1998 Volume 34 Issue 7 Pages 666-673
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSProportional, Integral, and Differential controller (PID controller) is the most popular elment in industrial control applications. One of the applications of hot strip mill in steel-making industry is mill drive system which is composed of many masses and shafts, and which has many torsional vibration modes. Due to this vibration, response of drive control system is not sufficient for strip thickness accuracy. Authors have aimed to use popular PID controller in order to improve response specification, and certificated usefulness of PID controller with some kind of filters at suppressing torsional vibrations. Finally in real hot strip mill, strip thickness has been improved with new drive control syetem added by vibration suppression controller.View full abstractDownload PDF (1719K) -
Morimasa OGAWA, Tohru KATAYAMA1998 Volume 34 Issue 7 Pages 674-681
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA PID setting procedure is presented to provide a critically damped response to a reference change for a first-order lag process with time delay. It is shown that the optimized PID settings based on the ISE (Integral of Squared Error) has a significant disadvantage in that it tends to be more sensitive to modeling errors. To reduce the sensitivity, a method of optimizing the PID setting is developed by incorporating a constraint on the manipulated variable. It is found a remarkable improvement of control performance against modeling errors.View full abstractDownload PDF (2144K) -
Toru YAMAMOTO, Toshitaka OKI, Masahiro KANEDA1998 Volume 34 Issue 7 Pages 682-688
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn recent years, the structure and the mechanism of the human brain have been clarified partially, and their knowledges are formulated as neural network systems. Furthermore, there have been applications of neural networks to pattern matching problems, pattern recognitions, learning controls and so on. Especially, neural network techniques have widely used in adaptive and learning control schemes for nonlinear systems. However, generally, it costs a lot of time for learning in the case applied in control systems. Furthermore, the physical meaning of neural networks constructed as a result, is not obvious. In this paper, a design method of self-tuning PID controllers is proposed, which has a fusional structure of self-tuning and neural network schemes. This method enables us to understand a physical meaning of the control parameters, and also to adjust PID gains quickly. Finally, in order to show the effectiveness of the proposed self-tuning PID control scheme, a numerical simulation example is illustrated.View full abstractDownload PDF (1789K) -
Toshihiko NAKATANI, Kohei OHTSU, Tadatsugi OKAZAKI, Naoki MORIYOSHI1998 Volume 34 Issue 7 Pages 689-691
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper provides a simple and a safe automatic P, I, D gains tuning method using relay control, for typical marine controllers with PID control law. The on-board computer control system using relay control is applied to typical three types of ship's controller; (1) autopilot system, (2) yaw control system through bow-thruster and(3) diesel engine governor system, and the results of the full scale experiments using a small training ship are discussed.View full abstractDownload PDF (503K) -
Cunwei LU, Akashi YAMAGUCHI, Seiji INOKUCHI1998 Volume 34 Issue 7 Pages 692-697
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSMoire topography has an advantage of measuring 3D shape of object using only one image. However, since classical moire topography can hardly discern orders of moire stripes, this method has difficulties in judging convex/concave of the object. Phase-shifting is an efficient method to solve the problem of judging the surface unevenness. This method is not only deliver a way to uneven shape but also improve the sensitivity. This method is, however, on condition that images of different phase have to be obtained, and this method cannot be calculated orders of discontinuous stripes.
In order to solve the above problems, we propose an intensity modulated moire topography. The key point is to use the intensity modulated light source. This method enables us to get the relationship between order and this intensity of moire stripe. Moreover, we can embed this method to slit-pattern projection method to calculate the order of slit-light and to judge an edge by only use fewer image.View full abstractDownload PDF (3962K) -
Masahiro ISHIBASHI, Masaki TAKAMOTO, Yu-ichi NAKAO, Toshio YOKOMIZO1998 Volume 34 Issue 7 Pages 698-706
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSTwo of several critical nozzles were connected in series to calibrate the downstream one at low pressure against the upstream one kept at the atmospheric pressure. The measured discharge coefficients of Venturi nozzles machined by super-accurate lathes distributed along a fitted curve, which had been measured with homologous nozzles using a constant volume tank system at the atmospheric pressure, with deviations of less than ±0.04%. The discharge coefficient of quadrant nozzles had a smaller Reynolds number dependence than those of Venturi nozzles. Stability of the critical flow of the downstream nozzles was measured with varying their downstream pressure in the same configuration. Flow rates of all the nozzles with the throat diameters of 0.5-13.4mmφ with the Reynolds number of 1.7×103-8.6×104 did not vary more than ±0.02% when they are in the critical condition. Their critical pressure ratios decreased suddenly from certain values near the theoretical ones to 0.5 when the Reynolds numbers are decreased, but they remained at around 0.5 with the Reynolds number down to 1.7×103. Detachable diffusers for short nozzles were shown to be effective to make their characteristics similar to those with integrated diffusers in spite of a small step at the contact plane. A new method to test a flowmeter at various volume flowrates by using only one critical nozzle is shown to be possible by controlling the pressure at the upstream of the nozzle.View full abstractDownload PDF (2249K) -
Masahiro ISHIBASHI, Masaki TAKAMOTO, Eizo WATANABE1998 Volume 34 Issue 7 Pages 707-713
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA new method to calibrate a critical nozzle against the other two, which have been already calibrated, was developed. The method bases on the linear dependency of the pressure between nozzles connected in series on the ratio of their flow rate. Two reference nozzles and the one under test are connected in turn at the upstream of another arbitrary critical nozzle to compare the pressure between the nozzles. The flow rate can be calculated from a linear interpolation between the two reference flow rates by using the difference of the pressure between the nozzles. No instruments other than a pressure gauge, which must be linear in a narrow pressure range, are required, that is, the system need few procedure to keep its accuracy for a long period. An analysis showed that the uncertainty of the method was almost the same as that of the reference nozzle. This was demonstrated by a realized system by calibrating the nozzles which have been already calibrated by a constant volume tank system. The system is fully automated except for installing the nozzle under test and so efficient that one calibration takes only about 10 minutes.View full abstractDownload PDF (1457K) -
Takeshi HATSUZAWA, Reiko IRIE, Sekiya KOIKE, Kazuo MARUYAMA1998 Volume 34 Issue 7 Pages 714-718
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA tapping stylus for surface topographical measurements by using a quartz fork of watch has been developed. The principle is based on a fact that output voltage of the quartz folk driving circuit is a function of the distance from the surface, as one of the vibrating legs is tapping the surface periodically. A servosystem is constructed to maintain the distance between the leg and surface to a constant gap, with an x-y piezodriven scanner just like other SPMs. Some examples of the measurement are compared with SEM micrographs and profiles obtained by an optical stylus tester. Although measurement time is not so fast, this system has a fine resolution of several nm in vertical direction, and that of tens of nm in horizontal direction.View full abstractDownload PDF (2769K) -
Naomichi YOKOI, Yoshihisa AIZU, Hiromichi MISHINA1998 Volume 34 Issue 7 Pages 719-725
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSPhase Doppler anemometry (PDA) is one of the useful and reliable optical methods for sizing small spherical particles. However, this method is sensitive to the Gaussian beam effect which can cause phase fluctuation and therefore erroneous measurements. This paper theoretically studies the mechanism of the phase fluctuation. A detailed and systematic estimation of the phase fluctuation is performed by using geometrical optics. The validity of this estimation is confirmed by numerical simulations based on the generalized Lorenz-Mie theory. Moreover, we discuss the optimum measuring conditions which can minimize the phase fluctuation.View full abstractDownload PDF (1718K) -
Yoshihiko KOSEKI, Tatsuo ARAI, Kouichi SUGIMOTO, Toshiyuki TAKATSUJI, ...1998 Volume 34 Issue 7 Pages 726-733
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, we experimentally evaluate the accuracy of parallel mechanism using Laser Tracking Coordinate Measuring System. The system has 4 tracking laser interferometers to measure the distance from retroreflector incrementally. Redundant 4 measurements enable us to identify relative location of each laser. Then the coordinate of retroreflector can be estimated precisely. We test the repeatability of parallel mechanism, and find that positioning error is less than 0.099mm. Then we calibrate the kinematic model of parallel mechanism to improve its absolute accuracy. The positions and poses of the endplate are measured and used for reference data of calibration and the kinematic parameter is modified to minimize the positioning error. Its maximum error is 0.98mm.View full abstractDownload PDF (3593K) -
Hiromitsu KUMAMOTO, Ichiro SAKAMOTO, Kenji TENMOKU, Hiroshi SHIMOURA1998 Volume 34 Issue 7 Pages 734-740
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSLongitudinal controllers are derived for an automated car driving. Two types of information sources are considered: the first-order information includes locations and speeds of following and leading cars, while the second-order information contains accelerations/decelerations in addition to the first-order information. A proper headway distance is defined for a variable speed of a leading car, sliding mode and adaptive sliding mode control theories then become applicable, and stable and robust longitudinal controllers are derived. The acceleration/deceleration information available through the modern inter-vehicle communication and sensing technologies significantly improve the control performance. The adaptive sliding mode controller yields better results because it includes a stable and swift estimation mechanism for the maximum disturbance value.View full abstractDownload PDF (1354K) -
Mitsuo HIRATA, Takashi SATO, Kang-Zhi LIU, Tsutomu MITA1998 Volume 34 Issue 7 Pages 741-748
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, we consider an H∞ problem with unstable weighting functions. Such weightings are used to achieve asymptotically disturbance attenuation and/or asymptotically tracking to reference input. Such problems cannot be handled by the standardH∞ control theory. To this problem, we present a necessary and sufficient condition for the existence of a solution by using Riccati inequalities. This condition needs no assumptions on the jω invariant zeros of G12 and G21.View full abstractDownload PDF (1572K) -
Shape Tracking Based on Curve Parameter EstimationHiromi MOCHIYAMA, Etsujiro SHIMEMURA, Hisato KOBAYASHI1998 Volume 34 Issue 7 Pages 749-754
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, a shape tracking control problem for a hyper degrees of freedom manipulator is discussed. The objective of shape tracking is to control its shape, which is characterized by all the link positions, to follow a given time-varying curve. Crucial key to solve this problem is to introduce a 2nd-order estimator that infers the curve parameters corresponding to the target link positions on the curve. The coupled dynamics of the manipulator and this estimator has the same properties as the manipulator dynamics which is useful for control design purposes. Therefore, familiar design methods for manipulator tracking can be utilized to solve the shape tracking problem. The shape tracking control law based on the ID (inverse dynamics)-based method is shown as a exapmle to illustrate how tofind shape tracking laws by using familiar tracking control methods.View full abstractDownload PDF (1802K) -
Kouji TSUMURA, Akira ITO, Yoshio SAITO1998 Volume 34 Issue 7 Pages 755-760
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, two types of identifications are analyzed with respect to the worst case identification error, which is necessary in the ordinary robust control system design. We show that the worst case identification error in deterministic approach is considerably large when I/O signals are corrupted by comparatively large noises. We compare it with the error of the least squares method which exponentially converges to zero as the numbers of data increase when noises obey stochastic processes of normal distribution or uniform distribution, and show the error of the least squares method which is equal to the worst case error of the deterministic approach in size, is exceedingly conservative. We point out the necessity of a modified robust control system design which consists of multiple weights according to the different sizes of uncertainties, and show a numerical example.View full abstractDownload PDF (1480K) -
Hidehiko SUGIMOTO, Kazuo WASHIDA1998 Volume 34 Issue 7 Pages 761-768
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSFor a conventional modified repetitive control system, designing of its pre-compensator so as to maximize the lowpass filter band width has been considered to contribute to the improvement of its control performance such as its tracking performance for reference input and its insensitivity to disturbance. The control performance of the control system, however, basically depends on its sensitivity function in the main frequency bands possessed by the reference input and disturbance. This fact suggests that the control performance of the control system should be evaluated using its sensitivity function. Therefore, the sensitivity functions of the conventional modified repetitive control system and the modified repetitive control system with corrected dead time already proposed by the authors were first calculated. The results of the calculation showed that the expansion of the lowpass filter band width did not necessarily result in improved sensitivity function of the control system in the intended frequency band.
The results of the investigation, however, indicated that some sensitivity functions of both systems to be compared intersect with each other in the intended frequency bands, suggesting that it is difficult to judge precisely whether the control performance of the system are good or not by its sensitivity function. Therefore, a new design method applicable both for the conventional modified repetitive control system and our proposed modified repetitive control system with corrected dead time was proposed. This newly proposed design method is based on simulation of such a modified repetitive control system to calculate its performance index IAE (integral of absolute value of error) and design the system so as to minimize its IAE.
The overall results of the investigations thus conducted by the authors revealed that a modified repetitive control system with corrected dead time, if so designed using the newly proposed method as to minimize its IAE, can achieve further improvement in its control performance.View full abstractDownload PDF (1662K) -
Gan CHEN, Toshiharu SUGIE1998 Volume 34 Issue 7 Pages 769-774
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper provides a new μ analysis and synthesis method of state feedback systems. First, we derive a necessary and sufficient condition for the system to have μ less than a specified valu γ by using parameter-dependent multipliers and the positive real lemma. Furthermore we give a computable sufficient condition which requires no more computation burden while being less conservative than former methods. Second, based on these results, we give an LMI condition for the existence of a state feedback gain which achieves that μ of the closed loop system is less than given γ. Finally, an illustrative numerical example is given.View full abstractDownload PDF (1236K) -
Kouji TSUMURA, Shuichi MURATA, Yoshio SAITO1998 Volume 34 Issue 7 Pages 775-782
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, we investigate relations between the results of the generalized gradient flow introduced by Helmke & Moore and the geometry of the set of linear systems. We first introduce a metric on the set of Gramians defined by Ohara et al. or Tsumura & Kitamori, and give a gradient flow for a minimization problem of a gap between Gramians. This result is extended to a Gramian assignment problem of state feedback systems. Moreover, we show a result of an approximation problem of system realizations, and finally analyze a duality of the flow on the set of Gramians.View full abstractDownload PDF (1846K) -
Fumitoshi MATSUNO, Osamu HIRASHIMA1998 Volume 34 Issue 7 Pages 783-788
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, modeling and control of connected two flexible beams are discussed. We derive dynamic equations of the connected flexible beams by means of the Hamilton's principle. As the obtained boundary conditions are nonhomogeneous, we introduce a change of variables to derive homogeneous boundary conditions. By solving the eigenvalue problem related to the distributed parameter system, eigenvalues and corresponding eigenfunctions are obtained. We construct robust controllers to compensate the spillover instability caused by residual modes which are neglected at the controller design phase. Simulations have been carried out.View full abstractDownload PDF (1334K) -
Yuichi SAWADA, Akira OHSUMI, Aya ONO1998 Volume 34 Issue 7 Pages 789-797
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper deals with a method of wave control for a class of uniform flexible beams (real beam) by introducing an idea of imaginary beam. The imaginary beam is assumed to be connected serially at the free-end of the real beam of interest and to have the distributed viscous damping force whose coefficient is selected optimally in such a way that the total energy generated by traveling waves becomes minimum.View full abstractDownload PDF (1764K) -
Jin-Hua SHE, Michio NAKANO1998 Volume 34 Issue 7 Pages 798-806
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper presents a design method for digital repetitive control systems in which the plant has structural uncertainties. A two-degree-of-freedom control system configuration has been employed in order to achieve the desired feedback and input-output performance independently. Through application of the sampled-data H∞ control theorem to the design of the feedback controller, a state-feedback repetitive controller that guarantees the robust stability of the closed-loop system and provides the desired closed-loop performance is obtained. A feedforward repetitive deadbeat controller is designed to obtain the desired transient response.View full abstractDownload PDF (1382K) -
Ikuko SHIMIZU, Koichiro DEGUCHI1998 Volume 34 Issue 7 Pages 807-813
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA system of registering multiple range images obtained from viewpoints whose relative position is unknown is proposed. We deal with a complex object such as a human hand in this system. In this system, we determine transformation from each respective viewpoints to the common world coordinate by correspondences of their planes. To deal with non-polyhedral objects, we construct three dimensional convex hull from each range images. Then, we find corresponding planes between two successive views. For that purpose, we build adjacency graphs of large faces contained in the each convex hull, and match graphs of two successive views based on their areas. We find transformation between all views simultaneously. We represent the 3D transformation by rotation matrix and translation vector. First, we determine the rotation matrices using normal vectors of the planes by constrained least squares fitting. The rotation matrix must constrained to be orthonormal with determinant 1. Then, translation vectors are obtained by simple least squares fitting.View full abstractDownload PDF (3324K) -
Hiroshi NOBORIO, Takashi YOSHIOKA1998 Volume 34 Issue 7 Pages 814-822
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA mobile robot usually estimates its position and orientation by a dead reckoning system. However under several kinds of uncertainties, e.g. inner/outer sensor errors and/or a slip, a mobile robot unfortunately misunderstands its true position/orientation in a real world as a virtual position/orientation in a computer world. Due to the difference, a mobile robot governed by sensor-based navigation sometimes gets lost in an unknown 2-D environment. On the observation, in this paper, we firstly improve previous metric sensor-based navigation algorithms in order for a mobile robot to deal with such uncertainties. Secondly, we name a class of errors homeomorpic error, where true and virtual positions in real and computer worlds are projected each other by the homeomorphism. Then, we theoretically show that improved metric algorithms never lead a mobile robot with the homeomorphic error to any deadlock (periodic cycle) in an uncertain 2-D world. Finally, we describe simulation results that improved algorithms guide a mobile robot with the homeomorphic error to a neighborhood of its destination surely.View full abstractDownload PDF (7310K) -
Gen ONISHI, Ichiro KIMURA, Tsutomu TAKEI, Yasuaki KUROE1998 Volume 34 Issue 7 Pages 823-829
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSMany psychologists have carried forward the research on “Human Sensibility”. Past techniques and modeling of “Human Sensibility”, however, were inadequate for engineering purposes, so a systematic approach to “Human Sensibility” is currently emerging. Music is a particularly interesting subject on “Human Sensibility” because it has a strong influence on the human mind and arouses various emotions.
This paper presents a model of “Human Sensibility” for music. Music consists of three major factors, namely, rhythm, melody and harmony. Of the three, we choose a human sensibility model for harmony. The model is constructed using a neural network and senses musical chord motion. Each chord consists of three simultaneous tones, and the input to the neural network is a set of two successive chords from a MIDI keyboard. There are two outputs from the model, which characterizes the “cheerfulness-gloominess” and “consonance-dissonance” of the chord motion.
Analysis of the hidden and output units of the network provides the following results.
1. The tone interval between the middle tone and the others is extracted in the first hidden layer and is amplified in the second hidden layer.
2. The “cheerfulness-gloominess” is generated in the output layer by addition of primary and secondary chord values. On the other hand, the “consonance-dissonance” is generated solely from the secondary chord value.
The above results agree well with the knowledge of musical theory.View full abstractDownload PDF (1228K) -
Osamu KATAYAMA, Shinzo KITAMURA1998 Volume 34 Issue 7 Pages 830-835
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSAs a central pattern generator, a neuro-oscillator with four neurons was used for the motion generation of a biped locomotive robot. There is a problem to determine unknown parameters in nonlinear differential equations of the neuro-oscillator so that it generates joint trajectories which yields reasonable biped locomotion. For this problem, we apply the describing function method for the neuro-oscillators, then we obtain equations which should be satisfied for the existence of a periodic solution. Adding a walking pattern which is represented by a trajectories of swinging leg, we can determine the unknown parameters from the equations obtained above. The effectiveness of the proposed method as a design procedure of the biped locomotion was assured by simulation study and experiments with a small biped robot.View full abstractDownload PDF (2449K) -
Yutaka MATSUTANI, Susumu HASHIZUME, Katsuaki ONOGI, Yoshiyuki NISHIMUR ...1998 Volume 34 Issue 7 Pages 836-843
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn design of systems, we generally start with a high-level specification and refine it stepwise until a sufficient low-level specification is reached. This paper deals with the following condition/event net (C/E net) construction problem: given a partial language as specification which is described hierarchically, construct a C/E net whose activity coincides with the set of all prefixes of the given partial language. The solution of this problem may be found by solving a series of C/E net construction problems step by step. The paper studies how the solutions of low-level problems have to do with those of high-level problems. It also presents a hierarchical solution technique.View full abstractDownload PDF (2004K) -
Hiroyuki TAMURA, Tomohiro SHIBATA, Shinji TOMIYAMA, Itsuo HATONO1998 Volume 34 Issue 7 Pages 844-849
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper a meta-heuristic satisficing tradeoff method for solving multiple criteria combinatorial optimization problems is proposed. Firstly, Pareto optimal solutions are generated by using a genetic algorithm with family elitist concept. Then, we try to find a preferred solution of the decision maker based on the satisficing tradeoff method. In this meta-heuristic satisficing tradeoff method we do not need to solve a complex min-max problem in each iteration, but we try to find a min-max solution in the Pareto optimal solutions, and starting from this solution we try to find a better solution locally by using simulated annealing method. As an example of multiple criteria optimization problem a numerical example of a flowshop scheduling problem is included to verify the effectiveness of the method proposed in this paper.View full abstractDownload PDF (1561K) -
Tsuneo YOSHIKAWA, Jun-ichi IMURA, Shinya TAKASAKI1998 Volume 34 Issue 7 Pages 850-856
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSLearning by showing is one of effective methods when robots acquire human skill of actions. Especially if plural sample of human same actions are given, it will be more advantageous to get the skills. To develop such a skill acquisition approach by plural showing, in this paper, as a first step, we present a method to find a time point of a trajectory on human action corresponding to each time point of the other trajectories. In addition, we apply our algorithm to the case of a Japanese kendama action to verify the effectiveness of our approach.View full abstractDownload PDF (1956K) -
Masaki OHTANI, Eitaro AIYOSHI, Ryota HORIE, Takashi MABUCHI1998 Volume 34 Issue 7 Pages 857-865
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn genetic algorithm, which is one of the methods for solving combinatorial optimization problems, a better state is said to be able to emerge out of local optimal states by the crossover operation which means the genetic intercommunication among several individual states. This paper presents the fundamentals of 'crossover-type state transition in a group of neural networks. 'In practice, a system composed of several neural networks is assumed in which they communicate with one another and the automatical crossover-type state transition is realized by neurons' input and output relations. The authors verify the characteristics and effectiveness of the presented state transtion in comparison with genetic algorithm through simple combinatorial optimization problems,View full abstractDownload PDF (1708K) -
Masaaki IDA1998 Volume 34 Issue 7 Pages 866-868
Published: July 31, 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSConventional generation methods of all efficient extreme points of multiobjective linear programming require solving linear programming as an efficiency test procedure. In this paper, we propose a new method for the generation and efficiency test based on non-pivoting method.View full abstractDownload PDF (447K) -
1998 Volume 34 Issue 7 Pages e1
Published: 1998
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (643K)
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