![]() | TNI Journal of Engineering and Information Technology ปีที่ 4, ฉบับที่ 1 |
1. | A Design of Low Cost 12-Lead ECG Acquisition System Using Raspberry PI [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Suradej Tretriluxana, Pongsathorn Wungpila, Kitiphol Chitsakul, Kentaro Kato | ||
This paper presents a new design of low cost 12-lead
Electrocardiogram (ECG) acquisition system. The system is
an integration of a biosignal analog-to-digital front-end
evaluation board, supplied by Texas InstrumentTM, and a
widely known controller from Raspberri PITM. These two
separately available gadgets were connected and operated by
the costom-made software. This acquisition system is made
for long-term multi-channel physiological signals recording
with its own storage. With no need of an extra computer for
operating, the system is stand-alone working at low cost. For
more than two hours, our prototype unit was running through
a test, acquiring 12-lead ECG signal from a simulator at 500Hz
sampling frequency. The restored signals were constantly
confirmed. The target groups of this work are the educators
and researchers in biomedical engineering area who are
demanding the biopotential signals. Our future work is to
develop a new user interface and data analysis software.
Full Text : Download! |
||
2. | A Method for Determining Inventory Policy Parameters for a Single Product under Limited Space [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Doan Trinh Nguyen, Jirachai Buddhakulsomsiri, Kanokwan Singha | ||
This study involves a method for determining
parameters for a (R, Q) inventory policy for a single product
under limited storage space. Most previous research developed
methods for finding optimal reorder point (R) and order
quantity (Q) that minimizes total cost including holding cost,
ordering cost and shortage cost. This study incorporates
limitation of storage space by adding the cost of overstocking
to the total cost. A method to find appropriate values of these
parameters is proposed for the case where a single product is
subject to uncertain demand and lead time limited storage
space capacity. A numerical example based on real product
data is used to demonstrate effectiveness of the method.
Full Text : Download! |
||
3. | A Study on Analysis and Design of Geometric Tolerances of Machine Tools [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Nobuhiro Sugimura, Ryo Takematsu, Naoki Satonaka, Wiroj Thasana, Koji Iwamura | ||
The objective of the research is to establish a
systematic design method applicable to analysis and design of
kinematic motion deviations of five-axis machining centers
based on the tolerances of the guide-ways. A systematic
procedure is proposed to determine the tolerance values of the
guide-ways theoretically under the constraints on the kinematic
motion deviations of five-axis machining centers, by applying
ISO tolerance definitions. The proposed method provides us
with theoretical way to design the geometric tolerances of the
guide-ways connecting the com- ponents of five-axis machining
centers, based on allowance of the kinematic motion deviation
of the tools against the workpieces.
Full Text : Download! |
||
4. | Application of Minitab 17 Statistical Software to Analysis of Students of the Faculty of Engineering [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Anchalee Supithak, Wipawadee Wongsuwan, Lerkiat Vongsarnpigoon | ||
This paper utilize Minitab 17, a statistical analysis
software, to study the significance of some factors relating to
enrolment and retention decisions of engineering students,
Thai- Nichi institute of technology. The student data from 2008
to 2015 are analysed. While the number of new students and
number of study programs increase together with time, an
analysis of variance (ANOVA) shows that the number of study
programs has no significant effect on the number of new students.
Regarding the retention rate, analysis of the data shows
that if the base is chosen to be the second year students, there
is no significant variation between batches of students in each
field.
Full Text : Download! |
||
5. | Development of Instantaneous Surface Temperature Sensor for Reduction of Heat Losses in Internal Combustion Engines [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Daijiro Ishii, Yuji MIHARA, Jaehoon Jeong, Hideki Koike, Susumu Sato, Hidenori Kosaka | ||
In this research, thin-film temperature sensor
(thin-film thermocouple) was directly formed on the surface
of combustion chamber of a Rapid Compression and
Expansion Machine(RCEM) which imitated the internal
combustion engines using a PVD (physical vapour
deposition) method, and it aims at high accurate and high
response measurement of instantaneous temperature change
from a compression stroke to a combustion start timing. In
this paper, the newly developed structure and form of thinfilm
thermocouple was described using one-dimensional
numerical calculation in order to reduce the measurement
error for real surface temperature. Moreover, the example
measurement results of instantaneous temperature using
RCEM were reported.
Full Text : Download! |
||
6. | Energy Properties of Torrefied Biofuel from Cellulose [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Toru Sawai, Satoru Mizuno, Tamio Ida | ||
Due to the rise of concern for recycling, waste
paper to produce recycled paper and paperboard is
recovered in individual countries of the world. The global
recovery rate is around 58% in 2014. But some paper such as
beverage paper containers and the low quality waste paper
are not suitable to the material for recycling. The utilization
of the above paper as a solid biofuel to replace coal is
considered to be reasonable from the standpoint of cascade
cyclic utilization of waste biomass. The waste paper is mainly
composed of cellulose and has a good property of low water
content, but its heating value is two-thirds of coal. In the
present study, the cellulose is reformed by the torrefaction
and it is assumed that the torrefied biofuel from cellulose is
utilized for the biomass and coal co-firing at existing coal
power plants. There are two objectives in the present study.
The first one is to correlate the energy properties of torrefied
cellulose with the mass yield. The second one is to clarify the
optimum mass yield condition to produce torrefied biofuel
from cellulose using the modified energy analysis model.
From the results, it is found that torrefaction has a positive
effect on the reduction of carbon dioxide emission in the case
that the energy consumptions for production and
transportation of torrefied biofuel are relatively high.
Full Text : Download! |
||
7. | Laser Peening for Surface Enhancement of Stainless Steel [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Hitoshi Nakano, Ippei Kitawaki, Miho Tsuyama | ||
Surface enhancement of stainless steel by laser
peening has been studied. Especially, in this study, effects of
control of plasma confinement layer on have been
investigated. The plasma confinement layer for the laser
peening is usually used the transparent medium to the laser
wavelength, such as a glass and water. The confinement
ability depends on the acoustic impedance of the medium. In
this study, the acoustic impedance of the water has been
controlled by dissolving sodium chloride (NaCl). Second
harmonic of Nd:YAG laser having the pulse duration of 4 ns
has been used for the laser peening experiments.
Commercial SUS316L stainless steel has been adopted as a
sample. The samples were investigated under nanosecond
laser shock loading in plasma confined by aqueous sodium
chloride solution. Vickers hardness test and X-ray
diffraction method are used to probe work hardening and
residual stress due to plastic deformation induced by laser
peening. Through hardness and residual stress
measurements, it is found that optimal concentration of the
sodium chloride solution has been existed for the laser
peening.
Full Text : Download! |
||
8. | Studies on Nitrate Reduction by Zinc-doped Titanium Dioxide Photocatalyst [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Satit Phiyanalinmat, Phawinee Nanta | ||
The research aimed to prepare Zinc-doped TiO2
photocatalyst by impregnation to reduce nitrate ion by UVC
irradiation. The effects of Zn loading, ethanol concentration
and hydrogen peroxide addition were examined. During the
reaction test, the nitrate concentration was determined by
UV-vis spectrophotometry. Then, the conversion was
analyzed to evaluate nitrate reduction for the catalyst
performance. The catalyst characterization was measured
for the surface area and particle size by BET and Laser
particle size methods, respectively. Among various results, it
was found that 12%wt. Zn-doped TiO2 photocatalyst with
0.06 M ethanol gave 31.62% for nitrate reduction. It had the
surface area of 10.62 m2/g and the particle size about 7.62
microns. It was speculated that ethanol became the holescavenger
reagent to increase the nitrate reduction while
H2O2 enhanced the efficiency of photolysis. Therefore, it can
be concluded that Zn-doped TiO2 photocatalyst can reduce
nitrate ion. The chemical kinetic of this result will be studied
further.
Full Text : Download! |
||
9. | The Effect of Visual Search Patterns of Non-Geometric Shape Inspection Tasks [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Phonsak Lerthiranphanya, Sumalee Chanchalor, Anucha Watanpa | ||
Product inspection is an important step and a
major quality control component for many industrial tasks.
Visual inspection is based on the use of the human eye to
search surface defects. The objective of this research was to
compare three types of visual search patterns, investigate and
identify differences between different pattern of visual search
in terms of performance measures to identify an effective
means of significantly the inspector for non-geometric shape
inspection tasks. The random search pattern, vertical search
pattern and horizontal search pattern were used to instruct
participants on visual inspection. Participants were provided
information about number of defect per inspection tasks,
provided with verbal description and graphical of the defect
types, visual search method of each groups and rotation
method for inspected. Then, the trials of visual inspection.
The performance of visual inspections measured by the mean
search time and the percentage of defects detected for each
visual search patterns. Analysis of one-way ANOVA both
indicated a significant treatment effect,
Full Text : Download! |
||
10. | Thin Film Sensors for Measuring Oil Film Condition in Machine Sliding Surfaces [แสดงบทคัดย่อ] [ซ่อนบทคัดย่อ] | |
ผู้แต่ง : Masaaki Shibata, Yuji MIHARA | ||
In order to reduce CO2 emissions and fuel
consumption, the reduction of mechanical friction loss is
very important technologies. To reduce such friction loss,
understanding the lubrication conditions of engine sliding
surfaces are very important. In order to investigate their
conditions and to validate the CAE (Computer aided
engineering), the author has developed a thin-film pressure,
strain, temperature and also thin-film gap sensor and
measured the distributions of oil-film condition in sliding
surface in machinery main bearings, piston skirts, pinbosses
and gear tooth surfaces. In this paper, the structure
and form of thin-film sensor especially for piston skirts,
plain bearings were discussed and provided a measurement
example.
Full Text : Download! |
||