บุญญากร ท่องมนต์วิทย์ จิรายุส ดีผาด และ เกรียงศักดิ์ เตมีย์*
Accidents caused by the motorcycle rider do not wear helmets are an important problem. of course, it’s not just fatalities that helmets help to prevent. A helmet could help the motorcycle rider to avoid serious injuries. Therefore, the motorcycle rider should wear helmets. At present, A system to detect people not wearing helmets using Deep Learning is already have, which an effective system have to a lot of data. This research has data limitations, so there's not enough data for training. For this reason, The Data Augmentation is used to increase the amount of data. It can be concluded that use of Data Augmentation resulted in increased efficiency from 90-95% to 99.3%.
ณรงค์ชัย นุ่นไธสง และ วิรัตน์ เจริญบุญ*
In this paper, cobalt oxide (Co3O4) and cobalt oxide/the activated carbon (Co3O4/AC) composite was synthesized by a chemical precipitation process. The crystal structure was studied using X-ray diffraction (XRD) technique. The findings show that cobalt oxide have a cubic structure. The morphology was studied using scanning electron microscopy (SEM). The SEM results showed that the Co3O4 had a nano-size which is a particle size in the range of 50-100 nm, and well distributed. The average pore size and specific surface area were analyzed by Brunauer-Emmett-Teller (BET) method. The specific surface area and an average particle size of the Co3O4 particles are approximately 89.6 m2/g and 51.8 nm, respectively. Whereas Co3O4/AC composite and AC samples have a specific surface area of 750.5 m2/g and 1066.0 m2/g. In an electrochemical study, the Co3O4, Co3O4/AC, and AC were coated on nickel foam by the doctor blade technique. Co3O4, Co3O4/AC and AC give specific capacitance of 184, 80, and 23 F/g when measured at a current density of 1 A/g, respectively. When performing a charge and discharge test with a small current density (1-3 A/g). Co3O4 gave the highest specific capacitance, possibility because Co3O4 was more redox-active than the AC and Co3O4/AC composites, respectively. It was found that when tested at high current density (5 A/g), Co3O4/AC composite material has specific capacitance, the power density and energy density values were greater than the other sample, with values of 55 F/g, 3747 W/kg, and 17.3 Wh/kg, respectively. Moreover, they were also stable up to 100 percent of the retention efficiency after the 1000 charge-discharge cycle test. The Co3O4/AC composite has high power density and high energy density characteristic. The makes Co3O4/AC composite material suitable for use as a supercapacitor electrode.
ภานรินทร์ อิ่นแก้ว พุธิตา เจือจันทร์ และ วิชุดา ไชยศิวามงคล*
The research purpose is to develop a web application for dissertation retrieval. This research was categorized in an investigation and methodology development category under the core concept of the life cycle of the system development. The users in this study were divided into 3 groups: (1) undergraduate students, (2) lecturers, (3) administrators from Department of Statistics, Faculty of Science, Khon Kaen University. Currently, there are many applications for dissertation storation such as AppSheet, Microsoft Excel and Microsoft Word. Moreover, the code for dissertation retrieval was not in a standard format, so it brought about an inconvenience to search and check the dissertation. These brought to research for developing a Web Application for dissertation retrieval which could be more friendly to use at any time via the Internet network. We provided a support system in 4 main important processes: logging in, adding, retrieving, and organizing the dissertation on the 7 tables database. The user interface is consistency the above 4 processes. The group of lecturers and administrators can access various statistical reports including the overall number of dissertations categorized by a main advisor and a group of 11 statistical contents. There could bring about the idea for building on new projects, planning and developing the curriculum. The group of administrators can easily access to manage information via the web. The users tried out and assessed of the system. There was a high satisfaction level from the undergraduate students and lecturer in the Department of Statistics (x̄ = 4.04; S.D.= 0.74 and x̄ = 3.81; S.D. = 0.74, respectively), and the highest satisfaction level from the administrator from the satisfaction assessment (x̄ = 4.30; S.D. = 0.69).
นภสร รัตนวุฒิขจร* และ นัท กุลวานิช
The objectives of this research were to use Mixed Systematic Random Sampling (MRSS), Circular Systematic Sampling (CSS), and Fractional Interval for circumstances when the sample selection range was not an integer. When a population trends linearly with mean square error (MSE) and the efficiency of all three systematic sampling methods is compared with relative efficiency (RE). The findings indicate that Mixed Systematic Random Sampling (MRSS) produced the greatest MSE values when compared to Circular Systematic Sampling (CSS) and Fractional Interval.
นิรุต มีเกิด* อำภาพร คณะแพง ชนากานต์ พรมอินทร์ ขวัญวิภา นิลจันทร์ และ พุฒิธร พุฒฤทธิ์
In this paper, we establish the formula for finding the number of triangles with integer side lengths that have given the boundary of each side length.
นัปการ โรจน์รุจานนท์ เดชอุดม ปามุทา มีชัย เซี่ยงหลิว จิรวัฒน์ สนิทชน โจนาลิซา แอล เซี่ยงหลิว และ ปิยะดา ธีระกุลพิศุทธิ์*
The salinity and drought tolerance levels were evaluated in twenty-two backcross improved rice lines carrying drought tolerance quantitative trait loci on chromosome 8 (DT-QTL8) and the salt tolerance SKC1 gene in the genetic background of the Thai elite rice cultivar ‘KDML105’. Firstly, drought stress was imposed on seedlings of the 22 rice lines grown in hydroponic culture by adding 20% polyethylene glycol 6000 (PEG6000), and drought tolerance was evaluated by leaf rolling, leaf drying, and biomass reduction. Ten rice lines that exhibited lower decrement in dry biomass than ‘KDML105’ after 28 days of drought stress, namely L13, L7, L24, L3, L14, L17, L8, L4, L6, and L16, were then selected for evaluation of salt tolerance in hydroponic culture in the presence of 150 mM NaCl. After 21 days of salt stress, all ten rice lines exhibited lower salt injury scores, lower Na+/K+ ratios, and lower biomass reductions than ‘KDML105’. The most tolerant line, L13, exhibited 62.58% and 47.71% reduction in dry biomass under drought and salt stress, respectively, compared with 77.35% and 83.64% reduction in ‘KDML105’. These improved lines may be tested for enhanced production in field conditions and serve as potentially good genetic resources for further improvement of ‘KDML105’ rice to tolerate multiple stresses.
สินจัย เพชรรัตน์ เบญญาภา บุญถาวร อนุชิต ดาราไกร และ จารุวรรณ มะยะกูล*
Halimeda macroloba Decaisne is a macrophytic green alga (Chlorophyta, Ulvophyceae) widely distributed in the tropical and sub-tropical marine ecosystems. It plays important role not only primary producers, but also potential calcium carbonate producer in the coastal ecosystems. The loss of this calcified Halimeda might have negative effects on ecosystem, decreasing the CaCO3 sands. Little is known of the effects of density on the population dynamics and CaCO3 contribution. Thus, the objective of the present study was to investigate the effects of population density on growth, CaCO3 accumulation, recruitment, and mortality rates. Three different density treatments were selected in a natural population of H. macroloba. A natural density of 19 thalli quadrat-1 was used as the medium-density treatment, and the low- and high-density treatments had respectively 10 thalli quadrat-1 and 38 thalli quadrat-1. Each individual was tagged and monitored for two months (December 2019 to January 2020) in order to determine the recruitment and mortality rates. Alizarin Red-S marking was used to indicate the growth and CaCO3 accumulation of H. macroloba. Our results revealed that no significant difference in recruitment and mortality rates were observed among the three treatments. However, the growth and CaCO3 accumulation rates in the low-density treatment appeared to be higher than those of high-density treatments. The area of the low-density treatment showed the highest growth rate and CaCO3 accumulation rate with 37.27±3.21 mg thallus-1 day-1 and 36.72±0.7 mg CaCO3 thallus-1 day-1, respectively. In conclusion, this work provides basic knowledge of population density of macrophytic green alga H. macroloba in relation to its growth and CaCO3 accumulation. Further investigation on other ecological and physiological parameters would help understanding the effect of density on growth and CaCO3 production in marine ecosystem of Lidee Island, Satun Province.