SCOPUS 2022
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Item A new study on the existence and stability to a system of coupled higher-order nonlinear BVP of hybrid FDEs under the p-Laplacian operator(American Institute of Mathematical Sciences, 2022) Abdulwasea Alkhazzan; Wadhah Al-Sadi; Varaporn Wattanakejorn; Hasib Khan; Thanin Sitthiwirattham; Sina Etemad; Shahram Rezapour; T. Sitthiwirattham; Mathematics Department, Faculty of Science and Technology, Suan Dusit University, Bangkok, 10300, Thailand; email: thanin_sit@dusit.ac.th; S. Rezapour; Department of Mathematics, Azarbaijan Shahid Madani University, Tabriz, Iran; email: sh.rezapour@azaruniv.ac.irIn this paper, we study a general system of fractional hybrid differential equations with a nonlinear _p-operator, and prove the existence of solution, uniqueness of solution and Hyers-Ulam stability. We use the Caputo fractional derivative in this system so that our system is more general and complex than other nonlinear systems studied before. To establish the results, Green functions are used to transform the considered hybrid boundary problem into a system of fractional integral equations. Then, with the help of the topological degree theorem, we derive some sufficient conditions that ensure the existence and uniqueness of solutions for the proposed system. Finally, an example is presented to show the validity and correctness of the obtained results. © 2022 the Author(s), licensee AIMS Press.Item A new study on two different vaccinated fractional-order COVID-19 models via numerical algorithms(Elsevier B.V., 2022) Anwar Zeb; Pushpendra Kumar; Vedat Suat Erturk; Thanin Sitthiwirattham; P. Kumar; Department of Mathematics and Statistics, School of Basic and Applied Sciences, Central University of Punjab, Bathinda, Punjab, 151001, India; email: kumarsaraswatpk@gmail.comThe main purpose of this paper is to provide new vaccinated models of COVID-19 in the sense of Caputo-Fabrizio and new generalized Caputo-type fractional derivatives. The formulation of the given models is presented including an exhaustive study of the model dynamics such as positivity, boundedness of the solutions, and local stability analysis. Furthermore, the unique solution existence for the proposed fractional-order models is discussed via fixed point theory. Numerical solutions are also derived by using two-steps Adams-Bashforth algorithm for Caputo-Fabrizio operator, and modified Predictor-Corrector method for generalised Caputo fractional derivative. Our analysis allows to show that the given fractional-order models exemplify the dynamics of COVID-19 much better than the classical ones. Also, the analysis on the convergence and stability for the proposed methods are performed. By this study, we see that how vaccine availability plays an important role in the control of COVID-19 infection. © 2022 The Author(s)Item A new version of (p, q) -HermiteÐHadamardÕs midpoint and trapezoidal inequalities via special operators in (p, q) -calculus(Springer Science and Business Media Deutschland GmbH, 2022) Thanin Sitthiwirattham; Muhammad Aamir Ali; HŸseyin Budak; Sina Etemad; Shahram Rezapour; S. Rezapour; Department of Mathematics, Azarbaijan Shahid Madani University, Tabriz, Iran; email: sh.rezapour@azaruniv.ac.irIn this paper, we conduct a research on a new version of the (p, q) -HermiteÐHadamard inequality for convex functions in the framework of postquantum calculus. Moreover, we derive several estimates for (p, q) -midpoint and (p, q) -trapezoidal inequalities for special (p, q) -differentiable functions by using the notions of left and right (p, q) -derivatives. Our newly obtained inequalities are extensions of some existing inequalities in other studies. Lastly, we consider some mathematical examples for some (p, q) -functions to confirm the correctness of newly established results. © 2022, The Author(s).Item A Study of Ideal and Perceived Images of Thailand Based on Inbound Tourists Perception(Research and Development Institute Suan Dusit University, 2022) Nuchruedee Rooymai; N. Rooymai; Faculty of Management Science, Suan Dusit University, Bangkok, 10300, Thailand; email: ajarnsandy@hotmail.comThis research had two aims, (1) to determine information sources influencing inbound touristÕs perception on the ideal image of Thailand (images of Thailand before visiting) and (2) to compare between ideal and perceived images (images of Thailand after travelling). Data was gathered from 400 inbound tourists who had experiences in travelling in Thailand. Selection of respondents of inbound tourists, by accidental sampling at Suvannabhum Airport 250 respondents and at Don Muang Airport 150 respondents. The research tools used in the study were structured questionnaires. The statistics for test the hypothesis ÒThe ideal and perceived image of Thailand is significantly differentÓ is a t-test. The study findings are as follows 1. The majority of respondents were mostly female, single and aged under 30 years old. Most respondents had Bachelor Degree in Education, were professional employees and earned income less than 20,000 US$ per year. The dominant characteristics are western (England, Germany, Russia, Sweden, Norway and Australia, respectively), spending from 10 to 20 days in Thailand, travelling alone, and their visit was mainly influenced by the nature and climate. Furthermore, most of them claimed the significant sources of Thailand information were their friends and social media, respectively. The social media they accessed regarding Thailand information, they mainly mentioned websites i.e., www.lonelyplanet.com and www. tripadvisor.com, respectively.Travel public relations agencies most used personal media or word of mouth, followed by social media especially the website www. lonelyplanet.com and www.tripadvisor.com.(2) Most respondents positively perceived ideal images of Thailand and reported positive perceived images of Thailand with very good level in all aspects. Significantly, the various kinds of food was given the highest score of both ideal and perceived images of Thailand. (3) The comparison between ideal images and perceived images of Thailand reveals that after travelling the scores given to an aspect of various kinds of food decreased, while the highest scores were given to an aspect of natural resources and environment. (4)The hypothesis test showed the difference in ten aspects between ideal images and perceived images of Thailand including aspects of natural resources and environment, safety of places, various kinds of food, excellence of hotels, worthiness of shopping, reasonability of service prices, information for travel, residential information, discounts for travel, and information publication for tourists by agencies and/or government organizations. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.Item A Study on Dynamics of CD4+ T-Cells under the Effect of HIV-1 Infection Based on a Mathematical Fractal-Fractional Model via the Adams-Bashforth Scheme and Newton Polynomials(MDPI, 2022) Hashem Najafi; Sina Etemad; Nichaphat Patanarapeelert; Joshua Kiddy K. Asamoah; Shahram Rezapour; Thanin Sitthiwirattham; S. Rezapour; Department of Mathematics, Azarbaijan Shahid Madani University, Tabriz, 3751-71379, Iran; email: sh.rezapour@azaruniv.ac.ir; T. Sitthiwirattham; Mathematics Department, Faculty of Science and Technology, Suan Dusit University, Bangkok, 10300, Thailand; email: thanin_sit@dusit.ac.thIn recent decades, AIDS has been one of the main challenges facing the medical community around the world. Due to the large human deaths of this disease, researchers have tried to study the dynamic behaviors of the infectious factor of this disease in the form of mathematical models in addition to clinical trials. In this paper, we study a new mathematical model in which the dynamics of CD4+ T-cells under the effect of HIV-1 infection are investigated in the context of a generalized fractal-fractional structure for the first time. The kernel of these new fractal-fractional operators is of the generalized Mittag-Leffler type. From an analytical point of view, we first derive some results on the existence theory and then the uniqueness criterion. After that, the stability of the given fractal-fractional system is reviewed under four different cases. Next, from a numerical point of view, we obtain two numerical algorithms for approximating the solutions of the system via the Adams-Bashforth method and Newton polynomials method. We simulate our results via these two algorithms and compare both of them. The numerical results reveal some stability and a situation of lacking a visible order in the early days of the disease dynamics when one uses the Newton polynomial. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.Item An Integrative Stress Reduction Program for Family Caregivers of Persons with Advanced Dementia: A Pilot Study(Slack Incorporated, 2022) Panawat Sanprakhon; Nujjaree Chaimongkol; Pornpat Hengudomsub; Helen W. Lach; N. Chaimongkol; Faculty of Nursing, Burapha University, Chon Buri, 169 Longhard Bangsaen Road, Muang District, 20131, Thailand; email: nujjaree@buu.ac.thThe current study sought to pilot test and examine the effects of an integrative stress reduction program (ISRP) on caregiver stress and sleep quality and behavioral and psychological symptoms of dementia (BPSD) of care recipients. Family caregivers (N = 12) of persons with moderate to severe dementia were recruited from memory clinics in Thailand. Twelve caregivers participated in five educational sessions on dementia care, stress, and BPSD management over 4 weeks. The Relative Stress Scale and Pittsburgh Sleep Quality Index were used to measure caregiver outcomes. The Neuropsychiatric Inventory was used to measure BPSD of care recipients. Outcome variables were collected at baseline, postintervention, and follow up. Data were analyzed using one-way repeated measures analysis of variance. Participants reported statistically decreased stress, improved sleep quality, and decreased BPSD among care recipients postintervention and at follow up (all p < 0.001). The ISRP was feasible and shows promise in reducing stress and improving sleep quality in caregivers and lessening BPSD in care recipients. Copyright © SLACK Incorporated.Item Analysis of Existence and Stability Results for Impulsive Fractional Integro-Differential Equations Involving the Atangana-Baleanu-Caputo Derivative under Integral Boundary Conditions(Hindawi Limited, 2022) Jiraporn Reunsumrit; Panjaiyan Karthikeyann; Sadhasivam Poornima; Kulandhaivel Karthikeyan; Thanin Sitthiwirattham; K. Karthikeyan; Department of Mathematics and Centre for Research and Development, Kpr Institute of Engineering and Technology, Coimbatore, Tamil Nadu, 641407, India; email: karthi_phd2010@yahoo.co.in; T. Sitthiwirattham; Mathematics Department, Faculty of Science and Technology, Suan Dusit University, Bangkok, 10300, Thailand; email: thanin_sit@dusit.ac.thIn this study, we consider the existence results of solutions of impulsive Atangana-Baleanu-Caputo ABC fractional integro-differential equations with integral boundary conditions. Krasnoselskii's fixed-point theorem and the Banach contraction principle are used to prove the existence and uniqueness of results. Moreover, we also establish Hyers-Ulam stability for this problem. An example is also presented at the end. © 2022 Jiraporn Reunsumrit et al.Item Antimicrobial Effect of Deodorant Products Containing Rhinacanthus nasutus Extract for Reducing Armpit Odor(Research and Development Institute Suan Dusit University, 2022) Nartlada Onvimol; Rittipun Rungruang; Surapha Modsuwan; Tasanee Panichakul; T. Panichakul; Faculty of Science and Technology, Suan Dusit University, Bangkok, 10700, Thailand; email: tasanee_p@yahoo.comThe aim of this study was to investigate the effectiveness of developing a roll-on deodorant that can reduce armpit microbiota bacteria to decrease armpit odor. The richest apocrine sweat glands in the armpit region secrete a variety of odor precursors that are transformed into volatile odoriferous substances by bacterial enzymes on the skin surface. The dominant armpits microbiota included four groups of bacteria such as Staphylococcus spp., Micrococcus spp., Corynebacterium spp., and Propionibacterium spp., and also fungi or yeasts. Two formulas of the roll-on deodorant products, RDEOF-1 and RDEOF-2 were developed. RDEOF-2 contained an ethanolic extract of Rhinacanthus nasutus (L.) Kurz leaves inhibited several microorganisms, including Gram-positive and Gram-negative bacteria. Sixteen healthy volunteers showed satisfactory assessment for RDEOF-2 that was greater than RDEOF-1. Armpit bacteria were collected by swab method and armpit odor was evaluated by ASTM method. Results showed dominant bacteria of two genera including Staphylococcus spp. and Corynebacterium spp. in all swab samples that mainly cause armpit odor. Armpit bacterial numbers before using deodorants were high in the range of 2x103 to 9x105 (CFU/mL). After applying RDEOF-1 and RDEOF-2, bacterial numbers decreased in the range of 1x103 to 8x105 and 3x102 to 4x105 (CFU/mL), respectively. Armpit bacteria were found in males more than in females. Deodorant products containing R. nasutus extract have been shown to reduce the bacteria that cause armpit odor. Therefore, the development of the deodorant product with natural plant extracts is warranted. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.Item Antioxidant and antibacterial activities of Pandanus amaryllifolius Roxb. (Pandanaceae) prop roots and its application for a novel bacterial cellulose (Nata) fermentation by enzymatic hydrolysis(Open Science Publishers LLP Inc., 2022) Thanasak Lomthong; Manida Chorum; Srisuda Samaimai; Panarat Thongpoem; P. Thongpoem; Division of Biology, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thailand; email: panarat_t@rmutt.ac.thPandanus amaryllifolius Roxb. (Pandanaceae) prop root was investigated for biological activities, i.e. antioxidant (DPPH radical scavenging assay) and antibacterial activity against Staphylococcus aureus DMST 2933 and Escherichia coli DMST 4212. The results showed that a crude extract of pandan prop roots exhibited antioxidant activity with IC50 of 230.24 ± 10.69 µg/ml, and it had a total phenolic content of 24.75 ± 0.74 mg GAE/g of TPC content and inhibited the growth of S. aureus DMST 2933 with 9.75 ± 0.35 mm of inhibition zone diameter. The prop root powder was used to develop a novel bacterial cellulose (BC) production using enzymatic hydrolysis. The maximum total soluble solids content at 2.67 ± 0.29 Brix was found when using prop root powder at 100 g/l with 4.0% (v/v) of the commercial enzyme (iKnowZyme¨ cellulase) after incubated at 50¡C, pH 5.0 for 24 h. The hydrolysis pandan prop root was fermented at room temperature for nine days with Komagataeibacter xylinus AGR 60, yielded 13.5 ± 0.50 mm of thickness with 7.90 ± 0.10 g of dry weight. Scanning electron microscope and Fourier-transform infrared spectroscopy were used to characterize the physical and chemical structure of the BC produced from pandan prop root, revealing that pandan prop root has the potential for a novel BC production with bioactivities of antioxidant and antibacterial properties. © 2022 Lomthong, et al.Item Autonomous Energy Management by Applying Deep Q-Learning to Enhance Sustainability in Smart Tourism Cities(MDPI, 2022) Pannee Suanpang; Pitchaya Jamjuntr; Kittisak Jermsittiparsert; Phuripoj Kaewyong; P. Suanpang; Faculty of Science and Technology, Suan Dusit University, Bangkok, 10300, Thailand; email: pannee_sua@dusit.ac.thAutonomous energy management is becoming a significant mechanism for attaining sustainability in energy management. This resulted in this research paper, which aimed to apply deep reinforcement learning algorithms for an autonomous energy management system of a microgrid. This paper proposed a novel microgrid model that consisted of a combustion set of a household load, renewable energy, an energy storage system, and a generator, which were connected to the main grid. The proposed autonomous energy management system was designed to cooperate with the various flexible sources and loads by defining the priority resources, loads, and electricity prices. The system was implemented by using deep reinforcement learning algorithms that worked effectively in order to control the power storage, solar panels, generator, and main grid. The system model could achieve the optimal performance with near-optimal policies. As a result, this method could save 13.19% in the cost compared to conducting manual control of energy management. In this study, there was a focus on applying Q-learning for the microgrid in the tourism industry in remote areas which can produce and store energy. Therefore, we proposed an autonomous energy management system for effective energy management. In future work, the system could be improved by applying deep learning to use energy price data to predict the future energy price, when the system could produce more energy than the demand and store it for selling at the most appropriate price; this would make the autonomous energy management system smarter and provide better benefits for the tourism industry. This proposed autonomous energy management could be applied to other industries, for example businesses or factories which need effective energy management to maintain microgrid stability and also save energy. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.Item BiberÕs Corpus-based Multidimensional Analysis to Investigate Lexico-grammatical Patterns and the Underlying Communicative Functions(Research and Development Institute Suan Dusit University, 2022) Woravit Kitjaroenpaiboon; Benjamas Khamsakul; Samniang Fahkrajang; Sutan Mumdaeng; Prissana Fongsarun; Wilasinee Ploylermsaeng; Witchaya Tiyapongprapbhan; W. Kitjaroenpaiboon; Faculty of Humanities and Social Sciences, Suan Dusit University, Bangkok, 10300, Thailand; email: woravit_kit@dusit.ac.thDouglas Biber is a veteran in corpus linguistics which is a field of linguistics studying natural written or spoken languages to better understand how the language is used and now is attracting numerous linguistsÕ interests. One salient contribution of corpus linguistics for present linguistic studies is that it helps reveal lexico-grammatical patterns (or grammatical collocations) naturally used in the language together with their underlying communicative functions. Biber is said to be a pioneer in this field of study and to have employed a statistical approach (Multidimensional Analysis: MA) to investigate lexico-grammatical collocations in his corpus of written and spoken discourses. This paper thus elaborates to what extent BiberÕs Corpus-based Multidimensional Analysis has contributed to studies in the field. After reviewing literatures related to the topic, the writers of this paper found that numerous scholars have agreed that BiberÕs Corpus-based Multidimensional Analysis is relatively good for studying lexico-grammatical patterns and their communicative functions and can further be applied for other studies particularly in the corpus linguistics field. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.Item Characteristics of Flattened Rice Flour Used with Daifuku(Research and Development Institute Suan Dusit University, 2022) Yotsinee Huadong; Tita Foophow; T. Foophow; School of Culinary Arts, Suan Dusit University, Bangkok, Dusit, 10300, Thailand; email: tita_foo@dusit.ac.thFlattened rice, an immature sticky rice product, contains high nutritional values and bioactive compounds. Based on its health values, this rice has been used as a functional ingredient in food. The objective of this study was to characterize the properties of sticky rice flour with substitution of flattened rice flour at 0-100% on Daifuku. Flattened rice flour was green-yellow in color and had very low amylose content (3.34%). The starch granule of flattened rice flour revealed an apparent pigment of phenolic compound and/or chlorophyll. According to pasting properties, peak viscosity, trough viscosity and breakdown of flattened rice flour were less than that of sticky rice flour. The FTIR spectra patterns of flattened rice flour showed it consisted of sticky rice polysaccharide structure as the main proportion. Daifuku with flattened rice flour at 75% had the highest sensory scores in all attributes especially in overall acceptance and texture. For nutritional analysis based on the calculated data, Daifuku with flattened rice flour had higher contents of calcium, iron and vitamin B1 than the control Daifuku. Therefore, the favorable properties of flattened rice flour and Daifuku are useful for further nutritional food product development. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.Item Clustering tourist using DBSCAN algorithm(American Institute of Physics Inc., 2022) Fuangfar Pensiri; Porawat Visutsak; Orawan Chaowalit; O. Chaowalit; King Mongkut's University of Technology North Bangkok University, Bangkok, 1518 Pracharat 1 Road Wongsawang Bangsue, 10800, Thailand; email: orawan@su.ac.thThe tourist clustering refer the aggregating of prospective tourist into different groups with common observance by using statistical data analysis technique. In this paper, we apply the Density-based spatial clustering of applications with noise (DBSCAN) to find the factors that can segment the tourist associated with using digital technology equipment as a tourism facility based on the data of tourist behaviour and activity. We describe the methodology, firstly analyse the algorithm. Secondly, compare execution of the different parameter values (Eps): the maximum radius of the neighbourhood from core point and the minimum number of points required to form a dense region (MinPts). Finally, examine the outcome of the application, Tourist's career and tourism style are two factors from eleven factors can cluster the tourists into eight groups with Eps and MinPts parameters 0.5 and 10 respectively. © 2022 Author(s).Item Collaborative project-based learning to train students for conducting the training project for older adults(Institute of Advanced Engineering and Science, 2022) Phetcharee Rupavijetra; Prachyanun Nilsook; Jira Jitsupa; Tipparat Nopparit; J. Jitsupa; Teacher Professional Group, Faculty of Education, Suan Dusit University, Bangkok, 295, Nakhon Ratchasima Rd., Dusit, 10300, Thailand; email: jira_jit@dusit.ac.thThis research aimed to study the results of collaborative project-based learning by students studying the training technique course to conduct training programs for older adults in state home care in Chiang Mai, Thailand. The population consisted of 40 undergraduate students from different faculties and years. The instruments used for data collection consisted of the lesson plan of the training technique course, student behavior form, journal form after teaching, student products, student reflection journals, the questionnaire to gauge the level of satisfaction of students, writing and presenting reflections on studentsÕ learning, and training evaluation based on the level of satisfaction of the older adults. The research separated students into two groups based on different faculties, each group was composed of 20 students, and they could learn better in a small group. Data were analyzed by using content analysis, statistical calculation, and percentage, and were presented in the form of a description and table. The findings showed the results of the collaborative project-based learning to train students for conducting training projects for older adults successful. The students had a change in their attitudes, behaviors, knowledge, skills, and experience in conducting training, their satisfaction showed at the highest level (97.50%). Students were satisfied with the project-based learning at the highest level (90%), and especially the opportunity to gain knowledge and experience from conducting training programs at the highest level (95%). The older adultsÕ satisfaction from participating in two training programs conducted by the students was at the highest level (100%) too. © 2022, Institute of Advanced Engineering and Science. All rights reserved.Item Combining Online Learning with Gamification: An Exploration into Achievement, Motivation, and Satisfaction of the Undergraduate(International Journal of Information and Education Technology, 2022) Jira Jitsupa; Mutita Takomsane; Sasanun Bunyawanich; Nualsri Songsom; Prachyanun NilsookÑThis research aims to develop online teaching plan through applying gamification. The results reveal learning performance, motivation, and satisfaction of the undergraduate towards the intervention. The sampling group is the undergraduate enrolling in Digital Literacy course in the second semester of the 2020 academic year of 154. The research tools consist of online teaching plan incorporating gamification, achievement test, motivation level evaluation form, and satisfaction survey of the undergraduate with this teaching plan. The results inform that the online teaching plan generates performance according to the specified 80/80 criteria. The learning performance of the undergraduate is significantly higher than that before the implementation of the online teaching plan incorporating gamification at .01. Learning motivation of the undergraduate is significantly different with the statistical level of .01. Also, the undergraduate is highly satisfied with online teaching applying gamification. © 2022 by the authors.Item Crisp Bhutan Oyster Mushroom (Pleurotus pulmonarius): A Potential Innovative Product for Commercialization(Research and Development Institute Suan Dusit University, 2022) Ubol Chuensumran; Att Khunsee; A. Khunsee; School of Culinary Arts, Suan Dusit University, Lampang Center, Lampang, 52100, Thailand; email: Att_khu@dusit.ac.thThis research was undertaken to create therapeutic mushroom products and disseminate knowledge to entrepreneurs. The researchers along with a community created product design and distribution channels and developed a brand for medicinal mushroom products based on the community's identity. Bhutanese oyster mushrooms were used to create mushroom products that consisted of Bhutanese oyster mushroom (88%), sugar (5%), vegetable oil (3%), soy sauce (2%), coriander seeds (1%) and salt (1%).The production method was conducted by to washing the mushrooms thoroughly, squeezing the water out and setting them aside; then mixing all ingredients together and dry in a hot air oven at 60¡C for 90 min. Then the batter was fried in hot oil at 90-95¡C for 5 min, and then placed in the oven at 150¡C for 20 min to crisp and reduce the surface moisture of the product. The sensory preference (7.80 Ð 8.80 points) was at a high level. Moreover, the knowledge can be transferred to entrepreneurs to implement in real production. It is a product that has the potential to be marketed for distribution as a health food with an emphasis on semi-premium marketing which can be differentiated by demonstrating the value and nutrients of Bhutanese oyster mushrooms. This research included designing aesthetic, outstanding and unique packaging to create the identity for the community. Furthermore, a brand of medicinal mushroom products called ÒHed Khik Khak or Giggling MushroomsÓ was created. The feedback acceptance (99%) was at a high level. The product has been registered under the trademark for Klong Chik Sub-district Community Enterprise to be used with therapeutic mushroom products in the future. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.Item Development of PLA/EPDM/SiO2 blended polymer for biodegradable packaging(John Wiley and Sons Inc, 2022) Ratanathavorn Wittawat; Rungruang Rittipun; Boohuad Nattaporn; R. Wittawat; Faculty of Science and Technology, Suan Dusit University, Bangkok, 228-228/1-3 Sirindhorn Alley, Bang Bumru, Bang Phlat, 10700, Thailand; email: wittawat_rat@dusit.ac.thHerein, we developed a blended polymer of polylactic acid (PLA) and ethylene propylene diene (EPDM) for cosmetic packaging using dihydrogenated tallow-treated nanosilica to improve the compatibility between PLA and EPDM, which are immiscible. The PLA/EPDM ratio was maintained at 95/5, and the loading rates of the modified nanosilica powder were set at 0, 3, and 5 phr. Fourier-transform infrared spectroscopy demonstrated that the nanosilica particles adsorbed the cationic surfactant solution onto their surfaces. Scanning electron microscopy showed that the EPDM domain sizes within the PLA matrix reduced with increasing modified nanosilica amounts. Moreover, the modified nanosilica improved the compatibility between the PLA and EPDM phases. The tensile strength and elongation at break of the PLA/EPDM/SiO2 (95/5/5) polymer were 50.39 MPa and 32.8%, respectively. The degradation behavior of the polymer in water and a sodium lauryl ether sulfate (SLES) solution was evaluated. The decomposition rate of the polymer was higher in SLES with low polarity and was determined to be approximately 3.4 _ 10_8Ês_1. Moreover, during a disintegration test (ISO 16929:2019), the polymer exhibited a disintegration rate of 100%, degrading completely in 28 days. © 2022 Wiley Periodicals LLC.Item Digital competences of vocational instructors with synchronous online learning in next normal education(Gate Association for Teaching and Education, 2022) Panita Wannapiroon; Prachyanun Nilsook; Jira Jitsupa; Sakchai Chaiyarak; J. Jitsupa; Suan Dusit University, Bangkok, Thailand; email: jira_jit@dusit.ac.thThis research study was conducted with the following objectives: To develop; evaluate and; investigate the vocational instructors satisfaction with the online instructional management developed using the synchronous online learning with 2,233 vocational instructors from the Office of the Vocational Education Commission, Ministry of Education, from five regions of Thailand, namely the Central, the Northern, the Northeastern, the Southern, and the Eastern Regions and Bangkok. The research findings revealed that the vocational instructors digital competence consisted of the following abilities: 1) analysis of course content; 2) application of video conference systems; 3) management of online classes; 4) management of online learning resources; 5) management of online learning activities; 6) development of tests; 7) development of instructional media; 8) development of instructional videos; 9) arrangement of active-learning activities; and 10) online evaluation and assessment of instruction. The vocational instructors digital competence in online instructional management after the synchronous online learning was found to be significantly higher than before the learning, at the p-value rate of .01. Overall, 93.19% of the vocational instructors were reported to pass the evaluation of online instructional management. The vocational instructors were found to be satisfied with their own digital competence in online instructional management at the highest level. © 2022 Eskisehir Osmangazi University. All rights reserved.Item Dynamical bifurcation of a sewage treatment model with general higher-order perturbation(Elsevier B.V., 2022) Yassine Sabbar; Anwar Zeb; Driss Kiouach; Nadia Gul; Thanin Sitthiwirattham; Dumitru Baleanu; Jiraporn Pongsopa; A. Zeb; Department of Mathematics, COMSATS University of Islamabad, Abbottabad Campus, Abbottabad, Khyber Pakhtunkhwa, Pakistan; email: anwar@cuiatd.edu.pkIn this research, we expose new results on the dynamics of a high disturbed chemostat model for industrial wastewater. Due to the complexity of heavy and erratic environmental variations, we take into consideration the polynomial perturbation. We scout the asymptotic characterization of our proposed system with a general interference response. It is demonstrated that the long-run characteristics of the chemostat process are classified by using the threshold classification approach. If the critical sill is strictly negative, the bacteria will disappear exponentially, indicating that the chemostat wastewater process is not running (excluded scenario), otherwise, the stationarity and ergodicity properties of our model are verified (practical scenario). The theoretical arsenal of this work offers a comprehensive overview of the industrial wastewater behavior under general hypotheses and introduces novel technical aspects to deal with other perturbed systems in biology. Numerically, we audit the accuracy of our threshold in three particular situations: linear, quadratic and cubic perturbations. We establish that the increasing order of disturbance has a passive influence on the extinction time of bacteria. This finding highlights that complex noise sources fulfill a significant role in the transient dynamics of chemostat systems. © 2022 The Author(s)Item Educational Inst itutionsÕ Disclosure of Financial Report in the Form of Sustainability Report(Research and Development Institute Suan Dusit University, 2022) Nopporn Peatrat; Sirikorn Rochanasak; Niroumon Suwannasri; Wanrapa Konginta; N. Peatrat; Laorutis Demonstration School, Suan Dusit University, Bangkok, 10300, Thailand; email: np_peatrat@yahoo.comDisclosure of information accompanying financial report, especially information that represents the educational institutionsÕ sustainability for stakeholders and users of financial reports to have confidence in the educational institutionÕs learning management and its quality. Therefore, it is imperative that education administrators understand, respond to and meet the expectations and needs of stakeholders by disclosing financial reports information in accordance with sustainability reporting guidelines. Furthermore, the report can be served as an assessment tool when evaluating the institutionÕs performance. Other than financial report, stakeholders and related parties can also access to other needed information. The reportÕs important areas comprise of Environmental Dimension which applies to the impact of the organization have on living and non-living things, including ecosystems, soil, air and water; Social Dimension refers to the impact on social system caused by the organization's operation, and Governance and Economic Dimensions are the impact of the organization has on the overall economic system of stakeholders at the local, national and global levels. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.