All issues
Volume 43, Issue 2
Displaying 1-11 of 11 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hidemitsu OGAWA, Ken-ichi SHIMOYAMA, Masakazu FUKUNAGA, Katsuichi KITA ...2007 Volume 43 Issue 2 Pages 71-77
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSIn semiconductor and LCD manufacturing processes, film thickness and surface profile of film-covered objects are needed to be measured simultaneously. By using the vertical scanning white-light interferometry, an algorithm is developed that enables such simultaneous measurement. It works well for objects covered with not only thick film but also thin film. Experimental results are presented for film-covered surfaces consisting of approximately 70nm SiO2 film on silicon substrate.View full abstractDownload PDF (11254K) -
Makoto KANEKO, Roland KEMPF, Yuichi KURITA, Yoshichika IIDA, Jumpei OK ...2007 Volume 43 Issue 2 Pages 78-84
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSThrough the observation of the eye deformation during an air jet application, we found that the eye deformation is always delayed with respect to the starting time of the air jet application. In order to explain such a characteristic, we newly introduce the cornea chain model, which assumes that the surface can be bent without any resistance under zero internal pressure, while it can not be deformed under an adequate internal pressure. We show that the chain model can nicely explain the characteristic distribution in the cornea deformation. Furthermore, we show that a pretty high correlation (R=0.816) exists between the delay time and the estimated internal eye pressure. This result can be used in a new type of a non-contact tonometer, which measures the internal eye pressure based on the delay time and which is gentler for eyes than the conventional one.View full abstractDownload PDF (18837K) -
Takayuki TSUZUKI, Kousuke KUWADA, Yuh YAMASHITA2007 Volume 43 Issue 2 Pages 85-92
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSThe purpose of this paper is searching for control Lyapunov-Morse functions (CLMF) using genetic programming (GP) for input-affine systems on general manifolds. The CLMF is an extended control Lyapunov function (CLF) to have multiple critical points. It is shown that a continuous global stabilizer is derived from a CLF for the system. A discontinuous global asymptotic stabilizer is obtained from a CLMF as well as CLF. However, there is no method constructing CLMF systematically. Then, we propose a method of searching for CLMF via GP to design the global asymptotic stabilizer.View full abstractDownload PDF (10797K) -
Yusuke ISAKA, Yasuaki OISHI2007 Volume 43 Issue 2 Pages 93-101
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSA computationally improved matrix-dilation approach is proposed for a robust semidefinite programming problem, whose constraint is a polynomial of uncertain parameters. This approach utilizes a sparse structure of the constraint polynomial and produces a small-size approximate problem to a given robust semidefinite programming problem. It is proved that the optimal value of the approximate problem converges to that of the given robust semidefinite programming problem as the used division of the parameter region becomes finer. In this sense, this approach is asymptotically exact. The size of the approximate problem is evaluated in the degree of the polynomial and is compared with the existing matrix-dilation approach. A numerical example is presented for illustration.View full abstractDownload PDF (4004K) -
Masaaki KANNO, Shinji HARA2007 Volume 43 Issue 2 Pages 102-109
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSIn this paper an algorithm with guaranteed accuracy is developed for the SISO H2 optimal tracking problem for a step reference signal. The algorithm utilizes a computer algebra system and interval arithmetic for the achievement of a stringent requirement of guaranteed accuracy. It also makes use of some strucural properties of the solution to the problem in order to facilitate guaranteed accuracy computation. This paper first derives a general expression for the solution to the SISO H2 tracking problem, revealing some features of the solution useful for guaranteed accuracy computation. Then a guaranteed accuracy algorithm which computes the optimal cost and the controller that accomplishes it is developed by exploiting the features along with some tools for guaranteed accuracy computation. Numerical examples are used to demonstrate the algorithm.View full abstractDownload PDF (4794K) -
Kenji TAKAO, Yoshihiro OHNISHI, Toru YAMAMOTO, Takao HINAMOTO2007 Volume 43 Issue 2 Pages 110-117
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSIn this paper, a new PID parameter tuning method is proposed whose PID parameters are adjusted based on a control performance assessment (CPA) index. Although a majority of studies about the CPA have been focused on the derivation of the CPA index, the control parameter tuning method has been hardly studied which is based on the CPA. On the other hand, the conventional adaptive controllers are tuned based on the variance of control errors and/or modeling errors. Therefore, the conventional adaptive controllers can not be tuned in the steady state which the control errors and/or the modeling errors do not exist so much, even if the CPA index becomes worse. However, the proposed method can be tuned in such a case because the controller is tuned based on the CPA index which is evaluated on the steady state. Moreover, the proposed PID parameter tuning method can deal with a variety of systems, since the CPA does not depend on the degree of the controlled object. Finally, the effectiveness of the proposed method is numerically evaluated on some simulation examples.View full abstractDownload PDF (4475K) -
Takashi OKAMOTO, Eitaro AIYOSHI2007 Volume 43 Issue 2 Pages 118-127
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSIn this paper, we discuss continuous game problems for which a normalization constraint (unit simplex constraint) constrains each player's decision-making. These problems can be classified into two types by their constraints. For one type, the simplex constraint applies to the variables for each player independently, such as occurs in a product ability assignment problem. For the other type, the simplex constraint applies to interferences among all the players, such as in a market share competition problem. We assume that the problems have Nash equilibrium solutions, and then we derive gradient system dynamics, which converge to the Nash solutions without violations of the simplex constraints. We discuss the equivalence of the derived dynamics and the replicator dynamics. Lastly, the effectiveness of the derived dynamics is shown by its application to simple example problems.View full abstractDownload PDF (4931K) -
Masaru OKAMOTO, Juri MURAKAMI, Kenji SHIBA, Toshio TSUJI2007 Volume 43 Issue 2 Pages 128-134
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSThis paper proposes a new pattern classification method using probabilistic neural networks with hie rarchical structure. In this method, a log-linearized Gaussian mixture networkas a probabilistic neural networki sused at each node of a herarchical classification tree. The method proposed here automatically constructs a tree of neural networks from given data, and can achieve suitable discrimination. Also, Cross-validation for a constructed neural tree can improve the generalization ability for discrimination of unlearned dat a. Validity of the proposed method is demonstrated with discrimnation of hand shape.View full abstractDownload PDF (14704K) -
Takahiro INOUE, Shinichi HIRAI2007 Volume 43 Issue 2 Pages 135-144
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSThis paper shows that a secure grasping of an object using a soft-fingered robotic hand is. easily achieved by adopting a two-dimensional soft finger model, which is evolved from an elastic force model derived in our previous study. After described the formulating process of the two-dimensional model, we derive normal and tangential constraints that appear during manipulating motions of the minimum d. o. f. two-fingered hand. Next, we formulate the Lagrangian and equations of motion of the hand system dealt in this paper. Then, we present a constraint stabilization method (CSM) dealing with holonomic and nonholonomic constraints, which is an effective tool to conduct the numerical simulation of a mechanical system with constraints. Finally, we validate the numerical algorithm and show the effect of secure grasping by evaluating the simulation results.View full abstractDownload PDF (13056K) -
Manabu INOUE, Fuminori KOBAYASHI, Minoru WATANABE2007 Volume 43 Issue 2 Pages 145-152
Published: February 28, 2007
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSA time-domain SRC, sampling rate converter, using Fourier interpolation to achieve less gate count than in frequency domain is proposed. The new SRC is implemented in 1/150 of the circuit size of conventional SRC with moderate performance using filters. It can also be used as back-end for filter-type SRC to achieve high performance efficiently.View full abstractDownload PDF (4444K) -
2007 Volume 43 Issue 2 Pages 153-
Published: 2007
Released on J-STAGE: March 07, 2013
JOURNAL FREE ACCESS
- |<
- <
- 1
- >
- >|