Rattanakosin Journal of Science and Technology

Using Grey Systems Theory to forecast Thailand cumulative hot spots

2024-04-17T13:28:07+07:00

This research aimed to forecast the cumulative hot spots of Thailand in 2023 using Grey Systems Theory and nationwide cumulative hot spots data from the Geo-Informatics and Space Technology Development Agency (a public organization) for the past 5 years, from 2017 to 2022. The hot spots were collected during the period of January to May, which is the last month of summer. Because the cumulative hot spot time series data decreased in 2018, it continued to increase in 2019 and 2020, then decreased in 2021 and 2022. The GM (1,1) with error periodic correction (EPC) model had a mean absolute percentage error of 10.54, which was less than the GM (1,1) model. Estimating the cumulative hot spots of Thailand in 2023 using the GM (1,1) EPC model, there will be 59,22 hot spots, a decrease of 4,202 hot spots from estimated 2022 or a decrease of 6.62 percent according to the continuously decreasing trend.

The Development of Knowledge Sharing Platform for Lifelong Learning Community Case Study of Sam Khok District, Pathum Thani Province

2024-04-10T09:56:24+07:00

The purpose of this research was to collect knowledge and develop community learning resources to promote lifelong learning characteristics in the people by using digital technology to create a knowledge sharing community platform that consists of media contents and digital learning resources for lifelong learning in Sam Khok district, Pathum Thani province. The samples used in the experiment were divided into 3 groups: teachers, students, and local people in Sam Khok, Pathum Thani, for a total of 150 people. Data were analyzed by frequency, percentage, mean, standard deviation, and t-test dependent. It was found that the community learning resources consisted of three components: the people, the place, and the tradition and culture. The results of the analysis of the needs for the development of the community's learning resources found that most people (86 percent) agreed that the website was the first preferred channel for presenting learning resources. The researcher therefore developed a learning platform as a web application on a domain called “samkhok.org”. Web application performance assessment results from the experts found that the overall web application performance was appropriate at a high level (=4.33, S.D.=0.57), and satisfaction assessment results from a sample group of 150 people found that the overall satisfaction of the web application was at a high level (=4.48, S.D.=0.56). In summary, the follow-up results of knowledge transfer from the sample group found that most of them applied the knowledge acquired to develop learning materials for teaching and learning and school activity materials, including transferring knowledge to personnel in the organization. In the overview part of this follow-up Most of the project participants benefited from being able to apply their knowledge to simple technologies such as smartphones and computers to develop learning materials and write articles on the platform, which can be practically used in both work and everyday life on social media.

Producing Healthy Wines rich in antioxidants from coffee cherry peels Arabica cultivars

2024-03-10T16:14:52+07:00

This investigation aims to produce a healthy wine with antioxidants from cherry coffee peel Arabica cultivars that antioxidants obtained are phenolic compounds with high antioxidant activity. Factors affecting the amount of antioxidants include the amount of fresh or dried cherry coffee peels. Factors affecting wine production include the type and amount of yeast used as well as the proportion between cherry coffee peel and fermented water etc. The research showed that producing healthy wine from coffee cherry peels at a ratio of dried coffee peels of 50 g per 3 L of fermented solution or 1.7% by weight per volume. Fermented inoculum with instant yeast for producing sweet bread at a ratio of 20 g of yeast per 3 L of fermentation with a sweetness of
20 ^oBrix under fermentation conditions at room temperature. The fermentation period was 5-14 days. It was found that the production of healthy wines containing antioxidants in the form of phenolic compounds with antioxidant activity in the form of DPPH and FRAP of dried coffee cherry peels was greater than fresh coffee cherry peels. The healthy wines obtained 15% of alcohol content, phenolic compound 33.56+0.35 mg gallic acid/g coffee peel, and antioxidant activity in the form of DPPH as 11.88+0.04 mg. ascorbic acid/g coffee peel. The antioxidant activity was 32.42+0.15% and the antioxidant activity in the form of FRAP was 7.55+0.02 mg FeSO₄/g coffee peel.

Developing a system for tracking, monitoring, and alerting to cyber threats on server computer using techniques of real-time event analysis and response

2024-03-27T16:16:16+07:00

This research aims to develop a system that can warn of cyber threats such as simple brute force attacks that occur on host computers or servers which provides access to data from outside the organization. Therefore, the developing system has alerted server computer administrators to receive information in near real-time notifications. Then, it can be able to prevent damage from cyber intrusion and continuously supervise the server computer at any time of the cyber attack. The research result found that in brute force attacks on servers, researchers use the developed system such as a system for tracking, monitoring, and alerting to cyber threats on servers using real-time event analysis and response techniques to monitor, detect, analyze, and alert to server computer administrators before any cyber attacker can harm the organization in real time with the highest efficiency ( = 5.00)

Performance and Economics Evaluation of Automatic Multi-Rotary Orange Juice Squeezer Machine

2024-05-09T14:03:57+07:00

Some seasons in Thailand, orange production causes an oversupply of oranges in the market and results in the price of oranges falling. Development of orange juice machines and processing of oranges into freshly squeezed orange juice and that is a way to solve problems and add value to oranges. The objective of this research was to evaluate the appropriate performance of orange juicers and analyze economics for their use by farmers, entrepreneurs, and community enterprises. Orange juice squeezer machine prototype consist of 4 set of Juicing machine and constructed from stainless steel. The squeezer head was made from superlene. The machine was used a 1 hp electric motor to feed, cut and squeeze of orange. The experiment was adjusted speed of Juicing in a range of 5-15 rpm, 2-3 mm of clearance and tested with the size of Sai Nam Phueng orange fruit in No.2 (45-50 mm), No.3 (50-55 mm) and No.4 (55-60 mm). The experiment was found that, the automatic orange juicer was provided the highest work efficiency of 97.60%, the optimal speed of Juicing and clearance was achieved of 10 rpm and 2 mm respectively with occurred in No.3 of oranges size. The highest squeeze rate was obtained at 600 kg/h. At highest work efficiency, the cost of squeezing orange fruits was between of 0.12-0.19 baht/kg and when used for hired to squeeze orange juice, the payback period was obtained in a range of 0.02-0.68 year or 7-248 days with the labor cost for squeezing oranges between of 1-4 baht/kg

On the Diophantine Equation 3^x+n^y=z^3

2024-03-07T13:19:16+07:00

By using elementary methods and Mihailescu’s Theorem, the non-existence of integer solutions for the title Diophantine equation is investigated, where n is a positive integer and x, y, z are non-negative integers with some conditions.

Modeling and Simulation of Multi-State Impulse Voltage Generator 22 kV 32 J

2024-01-23T11:28:57+07:00

This article proposed the multi-layer pulse pressure generator includes a charge compression resistor with a value of 6K, a forward wave resistor of 270, and a backward wave resistor of 10 has a spark plug, using a spherical head nut with a diameter of 0.5 centimeters and a gap of 0.3 centimeters. Through experiments, a suspended insulator head was used as the experimental load. When the experiment starts, it can be concluded that the 22kV multi-layer pulse generator can generate pulse voltage. However, the standard 1.2/50 µ s waveform is not available. From the charging waveform to the discharge time is 187.7 ns. When the peak value is reached, the tail wave will quickly decrease to the minimum value. The maximum value is 80 ns. The amplitude 54 V rated voltage 37.6 kV, minimum voltage 20 kV, test output voltage 20-37.6. kV can be seen that when the peak value is reached, the waveform fluctuates up and down to 0, indicating that the actual test results are passed. The oscilloscope has a larger oscillator because in actual testing, compared to analog oscilloscopes

The effect of natural fibers and para rubber latex on adobe bricks

2024-03-21T14:31:20+07:00

The aim of this study was to enhance the strength and water resistance of adobe bricks through the combination of natural fibers and para rubber latex. The initial mixing ratio of the ingredients consisted of clay: rice husk: sand in proportions of 6: 0.72: 2 by weight. Para rubber latex is mixed with 10% of the weight of the soil in mixtures containing latex. Natural fibers such as rice husk or coconut fibers replace rice husk at a rate of 4.5% of the soil weight. The materials were compressed into wooden molds measuring 10 cm in width, 35 cm in length, and 17.5 cm in height. This study aimed to simulate real conditions in curing bricks under the sun for 21 and 28 days without using plastic wrapping. The bricks were subjected to tests for compressive strength, flexural strength, and erosion at 21 and 28 days of curing. The results of the tests showed that the addition of para rubber latex or various types of natural fibers to the adobe bricks enhanced their properties.