English summary of the second number of volume 42 publishing paper
Original Papers
Title: Brightness of Flame and Letter Vision
in Using Flame-Lighting
Author: Hideaki SATO
題目：燃焼光の明るさとそれによる文字の見え方
著者：佐藤秀昭
Abstract
Prior to electric lighting, candles or oil lamp were used for lighting. The brightness of the names was much darker by comparison with the electric light. In this paper, the luminous nun and intensity of flames were measured and compared with those of an incandescent lamp(100V, 60W). In addition, letter vision in using name-lighting was studied for the relation between luminance contrast, adaptation luminance and visual acuity. It was found that it was barely possible to read letters of 3mm × 3mm in size under conditions where the illuminance of paper (reflection factor ρ = 50 %) was 0.61x of a small candle, and the luminance contrast C was 92 %, and where the distance from the paper to the eye was 60cm.Abstract
This study describes the development of a "Gijutsu Kyoiku" (Technology Education) database which can be searched with an original method for the order of repeating index. A searching system was developed that has the order of repeating index with three items of 1) keyword, 2) region and keyword and 3) author, and the simplified order of repeating index with title keyword. In the case of a small or middle database in a particular subject, the searching system having the order of repeating index is very effective since this system can contribute to analyze quantitave changes of subjects. Further, we were able to construct a Web database for this system. The Web database made it possible to use the system irrespective of time and space restrictions.(15)
Abstract
This paper reports on the development of
a system for the measurement of vibration
acceleration on living bodies over a low
frequency range. A vibration acceleration
meter with particularly high sensitivity
is required for the study of the influence
exercised by the high-speed running of vehicles
or trains on living bodies. The equipment
constructed for the said purpose is comprised
of an acceleration detection device, an active-type
low-pass filter, a power source regulator,
and an operational amplifier. The test conducted
with the equipment in question resulted in
a value of 525 mV/mm for the displacement
of the pendulum and ale Output voltage. This
value reveals that a high voltage is outputted
in relation to minute displacement, and ensures
that sensitivity is sufficiently high. With
regard to the dynamic characteristics of
the vibration acceleration meter as a whole,
a value constant enough to maintain 143 mV/ms-2
was shown in a frequency range of from 1
Hz to 6.5 Hz. The fact that a constant value
was shown implies that an identical calibration
curve can be used in the range referred to
above. It is ascertained from this that measurement
is possible over the above-mentioned frequency
range.
As a result of this measurement of acceleration
in a vertical direction at high-speed with
a vibration acceleration meter developed
in this manner attached to the driver' head,
a successful outcome in a frequency range
from 1.6 to 2.3 Hz was obtained. It is thus
warranted that the equipment can be put to
practical use.
Keywords: vibration acceleration meter, low
frequency range, semiconductor device, operational
amplifier, low-pass filter, regulator
(23)
Title: The Study on the Skill Evaluation
of the Brush Painting : About the Force in
the Parallel Direction to the Coating and
the paint quantity of the brush
Author: Yoshihisa OKAMURA, Makoto KURIBAYASHI
題目：刷毛塗りの技能評価に関する研究−塗り方向の力および塗料量について−
著者：岡村吉永・栗林 誠
Abstract
A study was conducted to evaluate coating
skill for the purpose of improving of coating
learning in woodworking in industrial arts
and homemaking. With particular attention
paid to the change of the force in the coating
which is applied to the direction parallel
to surface from the brush at the time of
coating, the ways to measure and evaluate
this was examined. The coating corrugation
that displayed the Change of the force in
the measured parallel direction to the coating
reflected the level of experience and manner
of working well. The results evaluated from
3 items (the initial painting time, the peak
of the force, the quantity of paint on the
brush) indicate that there are differences
in the degree of experience for the most
part. Further studies need to be conducted,
but it is felt that the 3 evaluation items
can become an index that measures the experience
of the brush painting skill independently
or in combination.
Keywords: Brush painting, evaluation of the
coat skill, one painting time, peak of the
force, paint quantity of the brush
(31)
Technical Information
Title: A Study of the Screen Constitution
for VDT Text Writing in Fundamental of Information
Science and Technology
Author: Haruhisa YAMAGUCHI
題目：情報基礎におけるVDTテキストライティングのための画面構成
著者：山口晴久
Abstract
The primary objective of this study was to
determine the optical screen configuration
for first-year junior high school students
studying the fundamental of information science
and technology. A study of easy-to-write
screen configurations to be used when reading
Japanese text in VDT is one of the most important
factors in the fundamental of information
science and technology class. The reading
performance of first-year junior high school
was studied as they wrote textbooks while
VDT conditions such as font size, screen
brightness, text and background color were
altered. The performance of first-year junior
high school students was also compared with
the results for a group of university students.
The findings were as follows: 1) the optical
screen configuration for the first-year junior
high school students was somewhat different
from that for university students; 2) the
optical letter size for the first-year junior
high school students was determined to be
18 points which was greater than that required
for the university students which was 14
points, 3) ideally each students should be
able to adjust his or her own screen configuration
in order to satisfy their individual needs.
However, if default screen conditions for
writing were to be used in first-year junior
high school classrooms, the optical background
color would be white, the text black, the
brightness-contrast high, the letter style
Minchoutai, with continuous sentences in
a 18 font.
Keywords: technology education, the project
method, process-knowledge, creative development,
main-project and sub-project
(41)