Transactions of the Institute of Systems, Control and Information Engineers
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 2185-811X
PRINT ISSN: 1342-5668

Transactions of the Institute of Systems, Control and Information Engineers Vol. 14 (2001), No. 7

  • Multivariable System Identification Experiments for Semiconductor Exposure Apparatus Supported by Anti-Vibration Units Using Subspace Method

    pp. 339-346

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.14.339

    In this paper, multi-degrees-of-freedom (multi-DOF) system identification of semiconductor exposure apparatus supported by anti-vibration units is discussed. To meet nanometer order semiconductor lithography demands for alignment accuracy, vibration control is one of the most important technologies in the semiconductor exposure apparatus supported by anti-vibration units. A dynamical model of the plant is necessary in order to design the microvibration controller and to evaluate the performance of the control systems. The controlled object is essentially a multivariable system, because the plant has 6-DOF motional modes. All the DOF of the plant are simultaneously excited and the multi-DOF dynamical model is identified from the exciting signals and the vibration output signals. The model is practically constructed in a short time using subspace method in system identification theory. Identification results are evaluated through experimental data in comparison with a conventional frequency response method.
  • A Unified Computational Approach to Nonlinear Optimal Control Problems

    pp. 347-356

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.14.347

    There are many kinds of nonlinear optimal control problems, such as constrained/unconstrained problems, free/fixed terminal-time problems, parameter dependent/independent problems, and so on. It is said that those optimal conrtol problems, especially free-terminal-time, parameter-dependent, and initial-state-constraint ones, are very difficult to slove numerically. In this paper, based on a new idea, we present a unified computational approach that is applicable to those optimal conrtol problems. We demonstrate the effectiveness of our approach through some numerical simulations, includng time-optimal control problems, and a singular control problem.
  • Attitude Control of Legged Robot Emu on a Slope with Unknown Slope Angle

    pp. 357-363

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.14.357

    In this paper, we discuss motion control of legged robot Emu which is set on a slope whose slope angle is not known exactly. According to the stability analysis, we found that the control system proposed by us has a property of parametric stability. At the same time, we found that there is a certain problem. Therefore, to overcome the problem, we propose a new control law based on nonlinear observer.
  • A Fuzzy Classifier with Polyhedral Regions

    pp. 364-371

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.14.364

    In this paper, we discuss a fuzzy classifier with polyhedral regions. First, we generate an initial convex hull of the maximum dimension using the data, included in a class, in the general positions. Next, we modify the convex hull using one training datum at a time by the dynamic convex hull generation method. Finally, for each convex hull we define a membership function using the minimum operator. We demonstrate the effectiveness of our method using iris and thyroid data sets.
  • Robust Function Approximation Using Ellipsoidal Fuzzy Rules

    pp. 372-378

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.14.372

    This paper discusses robust function approximation when the Takagi-Sugeno type model is used for the consequent part of fuzzy rules. With this model, the parameters of the linear equation that defines the output value of the fuzzy rule are determined by the least-squares method. Therefore, if the training data include outliers, the method fails to determine the parameter values correctly. To overcome this problem we use the least-median-of-squares method. Among the original training data set, we randomly select training data more than the number of parameters, and determine the parameter values using the least-squares method. We repeat this many times and determine the parameters with the smallest median of squared errors. We compare the proposed method with the least-squares method and the conventional least-median-of-squares method using the data generated by the Mackey-Glass differential equation.

Article Access Ranking

22 Sep. (Last 30 Days)

  1. Formation and Evolution of Inclusions in High Chromium Steel ISIJ International Vol.61(2021), No.9
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Preface to the Special Issue on “Recent Progress in Inclusion/ Precipitate Engineering” ISIJ International Vol.61(2021), No.9
  4. Effect of Heating Rate on Carbothermic Reduction and Melting Behavior of Iron Ore-Coal Composite Pellets ISIJ International Advance Publication
  5. Evaluation of Interfacial Energy between Molten Fe and Fe-18%Cr-9%Ni Alloy and Non-Metallic Inclusion-Type Oxides ISIJ International Vol.61(2021), No.9
  6. Modeling of Wall Shear Stress Induced Inclusion Transport and Removal in Multi-Strand Tundish ISIJ International Vol.61(2021), No.9
  7. Three-dimensional Quantitative Evaluation of the Lamellar Curvature in Pearlitic Steel Based on an Orientation Analysis of Cementite ISIJ International Advance Publication
  8. Production and Technology of Iron and Steel in Japan during 2020 ISIJ International Vol.61(2021), No.6
  9. Analysis of Air-Mist Cooling Effect for Coil in the Electromagnetic Induction Controlled Automated Steel Teeming System ISIJ International Vol.61(2021), No.9
  10. Simultaneous Analysis of Soluble and Insoluble Oxygen Contents in Steel Specimens Using Inert Gas Fusion Infrared Absorptiometry ISIJ International Vol.61(2021), No.9

Search Phrase Ranking

22 Sep. (Last 30 Days)

  1. blast furnace
  2. inconel 600
  3. blast furnace productivity
  4. miyamoto goro
  5. nozzle clogging
  6. b2o3 mold flux
  7. blue carbon
  8. investigation of arc behavior and temperature distribution corresponding to electrode and phase configurations in a multiphase ac arc
  9. ohno
  10. sei kimura