วารสารสถาบันเทคโนโลยีไทย-ญี่ปุ่น

TNI JOURNAL

เกี่ยวกับวารสาร

๐ ฉบับบริหารธุรกิจและภาษา ๐ ฉบับวิศวกรรมศาสตร์และเทคโนโลยี

๐ หลักเกณฑ์การพิจารณา ๐ ประเภทของบทความ ๐ ข้อกำหนด ๐ รูปแบบการเขียนอ้างอิง ๐ รูปแบบการเขียนบทความ

๐ บริหารธุรกิจและภาษา ๐ วิศวกรรมศาสตร์และเทคโนโลยี

วารสารวิชาการ

บริหารธุรกิจและภาษา
Journal of Business Administration and Languages

วิศวกรรมศาสตร์และเทคโนโลยี
Journal of Engineering and Technology

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!

Total 10 Record 1