第３９巻４号掲載論文の英文要旨
Vol.39 No.４
Original Papers
No. 9621
Development of a Digital Signal Processing Type AC Phase Control Circuit.
Haruyoshi AKIBA and Yoshinori SUYAMA
ディジタル信号処理形式交流位相制御回路の開発
秋葉治克・陶山宜典
Abstract
In this investigation , we developed an AC phase control circuit consisting
of digital signal processing techniques. This scheme detects a half period
of source voltage with a counter and a phase control angle a (alpha) which
is determined by calculating the digitized numeric value obtained from
the counter in a single board computer. A phase control angle command has
been provided from the personal computer to the single board computer by
using a printer interface. Consequently, the phase control angle a (alpha)
automatically follows the source frequency which ranges from 8 to 165 Hz
based on commands from the personal computer . Therefore , when using this
equipment with commercial frequencies (50 Hz or 60 Hz), this equipment
can digitally perform the phase control with the accuracy of the order
of 0.7ー (degrees) and without changing the hardware or the software .
Key words : Digital signal processing , Single board computer ,Personal
computer , AC phase control
No. 9628
The Transmission Characteristics and a Design for a Chebyshev-Type Low-Pass
Filter with Complex Poles
Junji FURUYA and Motoharu HAYASHIKAWA
複素極をもつチェビシェフ形低域フィルタの伝送特性と設計法
降矢順治・林川基治
A design and the transmission characteristics for a low-pass filter which
has Chebyshev-type attenuation characteristics and complex poles on the
complex frequency plane is presented. When comparing to circuits of the
same order, this low-pass filter is an improvement over an ordinary Wegner-type
low-pass filter or a conventional Chebyshev-type low-pass filter with regard
to the delay characteristics ( the linear phase characteristics ). In addition,
it has better slope characteristics than the Wagner-type low-pass filter
. The ordinary Chebyshev function used in a lumped-element circuit was
developed into a new type Chebyshev function which has conjugate complex
poles ( four poles ) both in the right half and in the left half of the
complex frequency plane. We obtained an attenuation amount and an amplitude
function for the low range filter motion. We calculated this and arrived
at the design formula for the low-pass filter which fulfilled the specifications.
A design based on actual specifications for this low-pass filter is provided.
The circuit was realized with an active circuit using IC operational amplifiers.
Key words: low-pass filter , complex poles , delay characteristics , attenuation
characteristics, IC operational amplifier , circuit synthesis.
No. 9636
Development of a Teaching Tool which Measures the Surface Roughness of
Metals: A Simple Surface Roughness Meter Using a Semiconductor Laser
Toshikazu YAMAMOTO, Ryoya MAKINO, Masahiro UEDA
金属表面粗さを測定する教具の製作 ―半導体レーザーによる簡易表面粗さ計―
山本利一・牧野亮哉・上田正紘
Abstract
In the junior high school metal working area of the Industrial Arts and
Home Making program the final process of material production is, in many
cases, a surface treatment such as painting. This is a very important process
because making the metal surface smooth will protect the surface from corrosion,
and further, give it beauty. The process of surface treatment starts with
rough sandpaper and gradually progresses to finer sand paper until the
surface looks glossy. It is of fundamental importance for students to develop
the ability to evaluate the finished condition of the surface by looking
at it or touching it. It is difficult, however, for beginning students
to precisely evaluate the condition of the surface using sight and touch
only. Therefore, a teaching tool that assists the students in determining
the degree of polishing at the completion of each step is desirable. We
developed a simple surface roughness meter to quantitatively measure the
degree of surface roughness, and conducted an experimental lesson using
it. The concept behind this teaching tool involves measuring the surface
roughness in a simple way by pointing the irradiated laser light (from
a semiconductor laser) on the surface and measuring the intensity of the
reflected light. This teaching tool has made it possible for students to
make a numerical estimation and therefore a pertinent evaluation of the
surface roughness. Using this device, student products have made remarkable
improvement and efficient exercises have become possible. The method of
producing this tool is also described for the benefit of those who would
like to make one.
Key Words : metal working, surface roughness, semiconductor laser, evaluation
of product
No. 9644
Development of Computer Assisted Learning Teaching Materials that Focused
on a Systematic Approach to Teaching Optics
Shin-ichi OKUNO, Kazuto TAKAHASHI, Momoko ARAI, Kiichiro KAGAWA
光学の体系化をめざしたCAL教材開発の試み
奥野信一・高橋和人・荒井桃子・香川喜一朗・上田正紘
Abstract
Currently, the contents of Optics is covered in Elementary School, Junior
High School and Senior High School. The instruction, however, is not necessarily
linked between schools or across subjects, since each school and subject
area deal with the content independently. We, therefore, developed CAL
(Computer Assisted Learning) teaching materials which focuses on a systematic
approach to the content of optics. That is, we proposed an organizational
structure in order to systematically teach the content of optics. This
structure was based on Hyper Card (Ver. 2.2). We constructed the teaching
materials from which pupils learn about the characteristics of light, light
energy, and the application of light. We selected 15 items as the "home
stacks". The teaching material consisted of a total of 488 cards and
the capacity was 18.5 MB. Explanations of the characteristics of light
energy, and applications, plus questions, answers, and experimental methods
were written on the structured cards within the stacks. We also included
some experimental results to support the teaching material and to make
it better. The subjects' self-evaluation following the utilization of theses
teaching materials was very positive.
Key words :optics, HyperCard, computer assisted learning, laboratory-based
teaching material,
Technical Inforrmation
No. 9639
The Development of a Teaching Aid for Teaching the Stroke Order of Chinese
Characters Using an Authoring Tool.
Akihiro JKAWASHIMA, Takamasa ASAI
オ−サリングツ−ルを用いた漢字筆順教材の開発
川島 章弘・浅井崇匡
Abstract
We selected the written stroke order of Chinese characters as a theme for
developing a multimedia teaching aid in the junior high school information
basics class. In order to develop a good quality multimedia teaching aid
it is not enough to have a good authoring tool. It is also necessary to
have an appropriate theme, an overall structure, balance, comprehensive
forms of expression, and sensitivity on the part of the producer. Software
that shows the stroke order used when writing Chinese characters was developed
through the use of moving pictures and sound. The software includes the
1006 characters which are used in junior school. Using only the mouse,
one can study the order for making strokes in a dynamic way. The software
has 146 MB which is stored on a CD-ROM. We are discovering that this software
has applications in junior high school handwriting classes (Shosha) and
at Japanese universities for foreign.
Key words : multimedia teaching aids, CAI, Kanji, Chineses character stroke
order.
No.9707
An Analysis of the Current Status of Fundamental Courses Related to Information
[Technology] in a Comprehensive Program of Study
Takeshi HONGO, Akira KIKUCHI
総合学科「情報に関する基礎的科目」の現状分析
本郷 健・菊地 章
Abstract
Fundamental courses related to information [technology] are required courses
in a comprehensive program of study. These courses are highly likely to
contain material related to basic information [technology] which students
in all disciplines are expected to learn. Therefore, it is the focus of
attention when we consider information technology education as general
education in the upper secondary schools. We conducted a study using questionnaires.
The goal was to determine the current status of this subject and the content
of these courses. In addition we inquired into information technology related
education in the upper secondary schools. Through this research we learned
that the teachers who are in charge of comprehensive programs of study
think that "fundamental courses related to information [technology]"
can be applied to a general education program or a technical education
program. (In addition, teachers understand the educational content of information
technology in a comprehensive program of study.) In terms of the educational
content in a comprehensive program of study, teachers consider "hardware"
and "multimedia and socialization" to be common concepts. We
also learned that teachers place a relatively high degree of importance
on the content which addresses the use of the computer as a tool. They
valued the computers as a tool used for the expression of thoughts and
because they are convenient. It also became clear that the continuity between
information basics in junior high school and high school is not always
effectively maintained.
Key words:Fundamental courses, information technology, comprehensive program.
technical education program