bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation of electric field strength in liquid lens from the concentric interdigitate electrode pattern
Authors: Duangkanya K , Kopwitthaya A , Malakit K , Infahsaeng Y 
Published: January 2021

Abstract
In this paper, the electric field distribution in designed liquid lens were simulated and demonstrated. The concentric interdigitate electrode was designed to generate the non-uniform electric field. Consequently, two liquid material on electrode undergoes dielectrophoresis (DEP) phenomenon and forming curvature can confine the incident light. Such two immiscible liquids were studied in the criteria of significant difference in dielectric constant such as Δε≈20. To be specific, the higher dielectric constant liquid as a lens material was first considered comparing to the ambient one. The simulation results reveal that, with fixed electrode width of 25 µm, the increasing gap of electrode from 25 to 125 µm can increase electric field strength at the lens apex from 237 to 386 V/m. Interestingly, the electric field strength was enhanced up to 533 V/m when the electrode width was increased. When the lower dielectric constant liquid was used as lens material, the electric field strength at the fixed width of 25 µm was increased from 16 to 71 V/m as the increasing gap from 25 to 125 µm. However, the low electric field strength of 63 V/m was obtained at broaden width of electrode. In both cases, the electric field strength is not significantly increased at the larger width for all conditions. Our model can be benefit for promising liquid lens design in term of low energy, cost reduction and compact device.
Fabrication of Holographic Grating by alternative setting of Michelson Interferometer
Authors: Inneam Chanikan , Srinuanjan Keerayoot 
Published: January 2021

Abstract
This paper presents the method and experimental results of the fabrication of holographic grating. The holographic grating was fabricated by using an alternative setting of Michelson Interferometer. In general, the interference pattern produces by Michelson interferometer is a circle fringe pattern. By an alternative setting of the interferometer, we could obtain a fringe pattern that has a linear shape. The angles between the two arms of Michelson interferometer, cross-beam angle, were adjusted until a linear interference pattern occurs. The interference pattern was projected onto a screen where a photoresist film is located. The photoresist film functional as a collective material of an interference pattern, i.e., a holographic grating. The film is developed and then fixed by a chemical process. By the chemical process, the holographic grating is permanence recorded on the film. After the fabrication process, we analyzed the physical properties of the holographic grating. We also measured the grating space by Scanning Electron Microscope (SEM). Relationships between cross-beam angles and grating space are shown and discussed. Experimental results show that we could apply the proposed method to fabricate a holographic grating.
Classical test theory and Rasch analysis of test of understanding of vectors (TUV)
Authors: Ly C Y , Rakkapao S , Nualtong K , Sumathakulawat W 
Published: January 2021

Abstract
This study aimed to apply classical test theory (CTT) and Rasch analysis of item response theory (IRT) to investigate Thai participants’ understanding of vectors and the characteristics of the test of understanding of vectors (TUV). A Thai version of the 20-items TUV was administered to 1,021 first-year science and engineering students at Prince of Songkla University, before and after common instructions. Although the engineering students (pre-score = 62%) had a significantly higher background of vectors than the science students (pre-score = 24%), proved by the effect size of Cohen’s d, both groups have improved their learning into a medium level of the normalized gain (0.3 < <g> < 0.7) after the instructions. Both groups improved the most with a vector representation concept. The participants were found to have the most difficulties with the unit vector and the cross product. However, the TUV is fairly easy for the assessed Thai first-year students. Overall, the item difficulty index derived from CTT was in moderate range (0.33-0.69). The difficulty index of the Thai-TUV obtained from CTT and Rasch analysis has a strong correlation indicating a reliable assessment tool.
Development of a simple line-follower robot with constant acceleration motion
Authors: Buachoom A , Wuttisela K , Wuttiprom S 
Published: January 2021

Abstract
A simple line-follower robot is an automated guided vehicle that senses the black line on a white surface using infrared (IR) sensors and then sends the signal to the Arduino Nano microcontroller. It drives two simple DC motors attached with two wheels used to move the robot’s direction that is left, right, and forward according to the sensor’s output, and it can control the speed of DC motors from the L298N driver circuit. This research aims to develop a simple line-follower robot with constant acceleration motion as an educational tool. The design process would allow the robot to detect white and black surfaces, travel along a 3 m straight line with a constant acceleration, and permit acceleration with a smartphone sensor by the Phyphox application. The robot is equipped with the acceleration sensor of a smartphone that can collect acceleration data. The data are then graphed and analyzed using the Phyphox application in real-time. The robot is designed to help students change acceleration by adjusting the motor’s output pulse width modulation (PWM) signal from 0 to 255. The signal was set at 230, a value that can cause the robot to move with constant acceleration. The robot’s average acceleration is 0.65 m/s2. This project can help students to illustrate the acceleration concept in the form of a graph together with robot motion.
A new manometer with Arduino
Authors: Jaewijarn C , Wuttiprom S 
Published: January 2021

Abstract
Manometer, the U-shaped tube contains liquid, is the apparatus for measuring pressure. By reading the risen liquid level, the pressure can be obtained. Arduino is the microcontroller that plays a crucial role for physics instruction because the device is simple, inexpensive and accurate. Arduino can be connected with many types of probe, for example, lux meter, sound meter, pressure meter, etc. Due to its application, teaching physics with Arduino can draw students’ attention excellently. The purpose of the study was 1) to invent the new manometer with Arduino for measuring pressure at different level of dept and figuring out the buoyance force on the object 2) to improve students’ understanding in pressure and buoyance force. The participants were 40 students. The method for the study was a one-group pretest-posttest design including 10 three-tier questions. The finding indicated that 1) the new manometer was handy and accurate 2) students’ concept about pressure and buoyance force had been improved at the significant level of .05.
A study of the inverse square law using LCD display projectors
Authors: Fongsuwan C , Tipparach U 
Published: January 2021

Abstract
Physics experiments on the inverse square law of light was designed and built to help students conduct experiments and learn about the inverse square law of light using LCD display projectors or High Temperature Poly-Silicon (HTPS). LCD displays can be served as two-dimensional gratings. The results show that when a laser light source with the wavelength of 532 nm passes through LCD display projectors, the diffraction patterns are generated on the screen. This pattern can be used to study the inverse square law of light. The correlation between the related variables is 0.997.
Smartphone as monitor of the gravitational acceleration: A classroom demonstration and student experiment
Authors: Kittiravechote A , Sujarittham T 
Published: January 2021

Abstract
As the development of technology, smartphones today come with various sensors to mediate a nicer customer use. This paves the way for new perspectives on using smartphones as the laboratory tools. Accordingly, this paper presents how smartphone determining of the magnitude of gravitational acceleration (g) may be made, describes a classroom demonstration, cites a reported experiment designed to obtain the necessary data, and suggests a student experiment to calculate the magnitude of g. The depth of the mathematical analysis of the data can easily be adjusted to the level of the class such as arithmetic mean, slope of graph plotted by hand, and slope of graph plotted by excel. After conducting the experiment with 33 students, major in program of general science, faculty of education, Bansomdejchaopraya Rajabhat University (BSRU), the students report the magnitude of gravitational acceleration nearly the theoretical value (g = 9.78 m/s2 at Bangkok; provided by the National Institute of Metrology (Thailand)) with a percentage difference less than 2%. We highlight the advantage of this experiment with the use of low-cost means and everyday devices in the classroom as a way of gathering empirical data about moving objects.
Option pricing for rice by using Feynman path integral
Authors: Sawetpiyakul Panus , Hirunsirisawat Ekapong , Yoo-Kong Sikarin , Termsaithong Teerasit 
Published: January 2021

Abstract
The options are contracts that give a holder the right to buy or sell an underlying asset at the specific price before or on the expiration date. In return, the holder must pay the premium, the price of an option, to the seller in order to make contracts. As the financial problem occurs with many Thai farmers because of the fluctuation of agricultural product price. In this work, we try to price the American put option by using Feynman path integral in order to create the rice price insurance. The numerical procedures are separated into 2 parts. Firstly, the Atlantic path is determined by quasi-European method. Secondly, hybrid lattice Monte-Carlo method is used to simulate the underlying asset price path in order to evaluate the expectation profit of the option, or the premium. Moreover, the volatility rate of rice price is determined. As a result, the premium of American put option for rice is determined, and there is a deviation less than 8% comparing with Monte Carlo valuation with LSM algorithm in these examples. However, the result suggests that in this work’s assumption, the option pricing by using Feynman path integral is not effective to be used.
The application of UV-C light for a DIY fabricated device to reduce bad smell in boxing gloves
Authors: Thepnurat Meechai , Sangto Paritchaya , Jaisuk Nutnicha , Saphet Parinya , Supawan Kanitta , Tong-On Anusorn , Klaewklar Kan 
Published: January 2021

Abstract
Currently, boxing and Muay Thai are popular sports and exercises around the world. Foul-smell in boxing gloves becomes a problem that needs to be eliminated before the next training session. The musty smell in boxing gloves is caused by accumulation of sweat and bacteria from the boxer’s hands. The process of eliminating odor using UV-C light can be the solution. In this research, the application of UV-C light was used to fabricate a DIY (Do it yourself) device to reduce bad smell in boxing gloves. Use of a UV-C light at a wavelength of 253.7 nm could remove musty smells within 30 minutes. The odor level in the boxing glove was measured by the electronic nose system, which was made up from 3 gas sensors. The results showed that UV-C light was able to reduce bad smell in boxing gloves up to 90%.
Implementation of quantum random walk on a real quantum computer
Authors: Puengtambol Warat , Prechaprapranwong Prapong , Taetragool Unchalisa 
Published: January 2021

Abstract
A random walk is one of the widely adopted random processes for simulation and approximation in multiple areas of science and engineering. Quantum random walk is an analog version of the classical random walk. It was first introduced in 1993 by Y. Aharonov et al. They presented that, with the nature of quantum characteristic, the average length of the walking path on a line is possible to larger than a classical random walk can produce. Therefore, the quantum random walk can be used as a tool to construct many other quantum algorithms. Moreover, it can solve graph problems that many real-world problems can be formulated. However, quantum algorithms are only useful in practice if we can implement them efficiently on a quantum computer. In this study, we are then interested in designing and implementing a quantum circuit that can be run on a real quantum computing device. We firstly focus on the most straightforward, which is a one-dimension, quantum random walk algorithm. Then, the quantum circuits are developed and implemented on a real quantum computer and a quantum computing simulator using software development kits provided by IBM. Lastly, the performance and results of the quantum circuits tested on both computing platforms are presented.
Evolution, structure and dynamics of the Thai stock market: A network perspective
Authors: Saichaemchan Somphoach , Bhadola Pradeep 
Published: January 2021

Abstract
We study 115 stocks from the Thai Stock Market (SET) from 2006 to 2015. The evolution of correlations between stocks is estimated for different periods of world major financial events and the effect of these global financial events on the Thai stock market is studied. A spectral analysis of the correlation matrix based on random matrix theory is done. The evolution and dynamics of threshold networks derived from the correlation matrix are studied. The entropic measure on the eigenvector gives the information contained in each eigenvector which shows that eigenvector on lower side of spectrum are highly localized as compared to higher side of spectrum. The evolution of various topological properties of network are investigated. Thai stock market is found to be less robust during the global financial crisis.
A cellular automation traffic flow model for traffic light signal management in intersection system with and without random driving behaviour
Authors: Manomairoj S , Chayanuwong T , Hiransirawat S , Disrattakit J , Disrattakit P 
Published: January 2021

Abstract
In this study, traffic light management in intersection system was simulated based on cellular automata traffic flow model. Characteristic of vehicles flow is defined according to the NS model. Our model was developed by adding driving behaviours, which are randomly defined in different maximum vehicle speed of mixed flow for two-lane traffic flow without lane-changing. The relation between time duration of traffic light signal and the traffic flow by analyzing vehicle density and averaged speed were investigated. The results show that the time duration of traffic light signal affects the traffic flow. Our model can be used to find the appropriated time duration to handle the traffic and can eventually reduce traffic jam. Additionally. Our result also presents an effect of the driving behaviour on the traffic flow.
Increase in surface hardness of stainless steel through graphene growth on stainless steel surface by chemical vapor deposition using waste vegetable oil as a carbon source
Authors: Surinlert P , Chuenoppakun P , Ruammaitree A 
Published: January 2021

Abstract
Stainless steel has been widely utilized due to it high resistance of corrosion, rust, and stain more than ordinary steel. However, a hardness of stainless-steel surface is not high resulting in engineering applications of stainless steel are limited. Graphene is an extremely hard material therefore the growth of graphene on stainless steel can increase the surface hardness of stainless steel. Vegetable oil consists of triglyceride which has abundant carbon in the constituent. Vegetable oil has been widely used for cooking. After the cooking, a huge amount of the waste vegetable oil is flushed down the drain resulting in water pollution. However, the waste vegetable oil still contains abundant carbon which can be used as a carbon source for graphene growth on stainless steel by chemical vapor deposition (CVD). In this study, the surface hardening of stainless steel through graphene growth on stainless steel by CVD using waste palm oil as a carbon source is demonstrated. The results show that the fourth-used palm oil can be utilized as a carbon source for the growth of graphene on stainless steel by CVD. Moreover, the graphene growth on stainless steel by CVD using the fourth-used palm oil can increase the surface hardness of stainless steel by 175%.
Design and Implementation of Trainer Kit for Hybrid On-Grid Solar Power Generation System
Authors: Ali M , Wardhana A S J , Damarwan E S , Muhfizaturrahmah  , Yuniarti  , Bagas W.S. 
Published: January 2021

Abstract
New and renewable energy is one of the hot issues discussed by various energy experts in many countries. As a country that has enormous renewable energy potential, Indonesia has not utilized it optimally. One of the reasons is the inadequate learning of new and renewable energy in schools and colleges. This article will discuss the design and implementation of a Trainer Kit for Hybrid On-Grid Solar Power Generation System (TK-HOGS). With this Trainer Kit, it is hoped that vocational education students will increase their competence in new and renewable energy. This study uses a research and development approach that adopts the ADDIE model. The development stages include Analysis, Design, Development, Implementation, and Evaluation. The results showed: (1) The TK-HOGS can produce an average power of 22.74 Watt with an estimated electrical energy of 136 WH and (2) Media experts and electric power engineers stated that this TK-HOGS is “Very Good” and very suitable to be used to help lecturers in carrying out learning.
MFRC522 RFID Technology Implementation for Conventional Merchant with Cashless Payment System
Authors: Dewanto S A , Munir M , Wulandari B , Alfian K 
Published: January 2021

Abstract
This article discusses how technological innovation develops to support conventional merchants by implementing RFID for a fast and easy payment solution. This payment uses a contactless smart card as a medium for electronic money or e-Money. This e-Money card can be obtained through a cashier available at merchants and e-Money balance can also be topped up by registering the card first. This cashless machine uses Arduino UNO as a microprocessor, MFRC522, Micro SD Module and 16x02 LCD Display. This cashless machine does not require internet to access the database and can also be used immediately without problems. This cashless machine can work within a range of 3cm for e-Money card detection with the fastest response time of 0.1s and takes a long time to process a balance of 1.4s. This machine is equipped with a menu variant selection at merchants using a serial monitor display integrated on the Arduino UNO.
Digitalization Strategy and Convergence of Media Adaptation in the Digital Era (case study on TVRI Yogyakarta)
Authors: Jean N , Ispandriarno L S 
Published: January 2021

Abstract
Recently, the digital era is evidenced by new technologies that contribute to the development of all activities of human life. Currently, the television industry is affected by the presence of digital television and media convergence due to the rapid technological development and the existence of the 4.0 industry revolution. The media industry is required to move on with the updated technology to provide its content in a good and rapid way. This study aims to analyze the issues facing TVRI Yogyakarta while trying to adapt the digitalization strategy and convergence of media in the digital era. In this study, the researcher used a qualitative method. The results found out that digital technology uses a spectrum of higher quality in terms of video, audio, and television data sets, Digital Television Broadcasting (DVB) can support more than one program on the same bandwidth channel. Shifting from analog to digital and competition are some of the problems faced by TVRI Yogyakarta while trying to adapt the digitalization strategy. To avoid facing digitalization strategy challenges, all Public Broadcasting Institutions engaged in television need to prepare themselves well to remain competitive and show their quality.
Kano Model Analysis of Android Apps Quality from End User’s Preferences
Authors: Putra R A S , Priyanto  
Published: January 2021

Abstract
This study aimed to explore the end user’s preferences regarding the features of an android app by classifying them with the Kano Model. The list of features was based on ISO/IEC 25010 combined with Android Core App Quality Guidelines. This expert system android app which is named ‘Pilih Media’ is used to help teachers selecting learning media based on Anderson’s theory of learning media selection. Respondents in this study were 50 teachers. Kano model was used in this study as a guideline in making questionnaires and also analyzing the data. From the study, it can be concluded that there are 17 features classified as the Attractive requirement category, six features classified as One-dimensional category, one feature classified as Must-be category, and five features classified as the Indifferent category. Overall, it seems that a lot of features have the potential to increase the end user’s satisfaction.
An Analysis on the Need for Mobile Learning-Based Interactive Learning Media in Vocational High School
Authors: Ninghardjanti P , Indrawati C D S , Dirgatama C H A , Wirawan A W 
Published: January 2021

AbstractTechnology development encourages many changes, one of which occurs in education realm resulting in the concept of learning media. The presence of online learning media will be effective and efficient, because learning can be done not only in face-to-face (physical) meeting between teachers and students, but also whenever and wherever the students are. However, in fact, most teachers found some constraints with managing the archiving learning and students often complained in the archiving learning; for that reason, a mobile learning-based interactive multimedia should developed. This research employed a descriptive qualitative approach, analyzing the result of interview with the teachers of Archiving subject in Vocational High Schools throughout ex-Surakarta residency. The students expect that the problem in the lesson can be minimized by the teachers by providing a mobile learning-based interactive multimedia learning media. The use of mobile learning interactive multimedia is expected to facilitate the learning process anytime and anywhere and to attract the students’ learning interest in archiving subject.
Markerless Augmented Reality in Construction Engineering Utilizing Extreme Programming
Authors: Hasanah N , Triyono M B , Pratama G N I P , Fadliondi  , Paramartha I G N D 
Published: January 2021

Abstract
This study aims to build Android-based Markerless Augmented Reality as a learning media in the Construction field, specifically Bridge material for vocational students. This study applies the Extreme programming method, which consists of the Planning, Design, Coding, and Testing stages. The developers and potential users performed the tests. The Functional Usability test results using Black-Box testing reveal that all features in the application can operate successfully. In terms of compatibility, the application is declared very suitable for use. The application has proven successful in running on several kinds of Android smartphones with different versions and screen resolutions. Meanwhile, in terms of Usability, the application acquires an eligibility percentage of 84.2%. Users find it easy to operate the application since they can immediately run 3D objects wherever they are, without being limited by the presence of markers. They consider being freer to run AR applications. However, the Markerless application that has been built can only be operated on Android smartphones version 7.0 and above.