Giichi Tomizawa

Applying Multiattribute-Based Group Decision Making Techniques in Complex Equipment Selection Tasks

A practicing industrial engineer, even an experienced decision maker, needs help in the sense that there is a necessity to use more logical or analytical decision support tools, especially when dealing with control and instrumentation projects which are often worth millions of dollars. In this article we propose an algorithm which can support the process of group decision making relating to industrial automation, especially involving the selection of control and instrumentation equipment. The aim of this article is to look only at the algorithms application and how it is applied. To this end, two test cases are used as examples: (1) selecting a local area network for installation in an academic environment; and (2) selecting an integrated control system for a real-world pulp and paper mill. Obtained results show that the algorithm leads to a satisfactory solution. A software form of the algorithm is being programmed for use as a decision support tool.

Automatic dyschromatopsia test

This is a basic research paper on color blindness tests using a microcomputer. The graphics display with 4,096 colors and a graphics tablet are connected to our microcomputer. We have developed two formal methods and automatized them.Test figures are generated easily using graphics tablet. The subject is able to examine himself by watching the screen. The results of these tests are diagnosed and printed automatically.The main characteristics of our system are easy operation and cost effective performance. We showed several results of this examination.

Color Blindness Tests by Color Graphic Display

This paper reports a basic research on color blindness tests1) employing the microcomputer. The graphic display having 4096 colors and the tablet device are installed in the microcomputer. Ishihara’s Color Blindness Test and Lanthony’s Desaturated 15 Hue Test are employed in the research.

Identification of System Structure by Fuzzy Modeling

Abstract When the system structure of various systems such as social systems, management systems etc. need to be identified, in which in particular the systems are non-linear, it is a complicated and difficult task to identify these systems. Fuzzy modeling method has been proposed by Sugeno et.al. That is the method to identify the model by using a set of rules with premise and consequent structures. But, the algorithm becomes very complicated according as the number of the rules increase. In order to get over the problem one efficient algorithm with employing preference functions is proposed.

Continuous measurements of respiratory gas analysis in hyperbaric heliox environment.

An N2 washout measurement was applied in the hyperbaric heliox environment to estimate lung ventilation distribution. In this procedure, N2 lung content was flushed by the inhalation of an N2 free gas. The purpose of the measurement was to investigate change in ventilation distribution in a hyperbaric environment which was created by the use of a deep diving simulator. Physiological parameters measured were respiratory gas concentrations (FN2, FAr, FCO2, FO2, FHe and FH2O), respiratory flow rate and temperature.The respiratory gas concentrations, flow, and temperature were simultaneously measured in a breath-by-breath fashion in the full pattern and digitally recorded with high accuracy and response. Concentration and flow of each breath were examined on a CRT and corrected as required prior to recording on a data base system. The corrections were made to compensate for gas leakage to and from the gas circuit, the electronic drift and noise.In this experiment, a mass spectrometer to analyze respiratory gas concentrations and an amplifier to enhance readings, were placed outside the hyperbaric chamber for reading of a Fleish pheumotachometer and thermistor sensors.In order to be analyzed, it was necessary to introduce the respiratory gas sample through the large pressure difference. Concentrations of physiological gases were decreased with the increased ambient pressure of He balance.Other technical points to be resolved were mass spectrometer and flow meter calibrations under hyperbaric conditions. The computer-assisted measurement was also used to conduct the complex procedure. The technical problems which were encountered are discussed in this study.The experimental results obtained at 12, 18 and 31 ATA (equivalent to depths of 110, 170 and 300m) are shown in comparison with results in the atmospheric environment.