SCOPUS 2022

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Torch Ginger (Etlingera elatior (Jack) R.M. Smith.) Tea and the Effects of Brewing Time on Color, Volatile Compounds, Chemical Compositions and Sensory Quality
(Research and Development Institute Suan Dusit University, 2022) Dudsadee Sapbua; Chalida Cholmaitri; D. Sapbua; School of Culinary Arts, Trang Center, Suan Dusit University, Trang, 92130, Thailand; email: dudsadee_sap@dusit.ac.th
The torch ginger tea made from flower of Etlingera elatior (Jack) R.M. Smith. It is a type of herbal tea (tisanes) with health benefits. The composition of volatile aroma compounds is one of the factors which induce relaxation and charming scent. The purpose of this study was to profile volatile compounds of the torch ginger tea and quality on physical, chemical, and sensory properties of torch ginger tea. The torch ginger tea infusion was prepared by adding 2 and 5 g of torch ginger tea into 100 ml of hot water (95¡C) infused for 5 and 10 min and is effected by quantity and brewing time. Results showed that volatile compounds of the dried petal of the torch ginger had the highest abundance that included _-pinene, 1-dodecanol and dodecanal, respectively. The odor description were fresh, sweet, pine earthy and woody. Prolonged brewing time and enrichment quantity of the dried petal of the torch ginger decreased L*(lightness) values but increased positive a* (red) and positive b*(yellow) significantly (p < 0.05). 5 g torch ginger with 10 min brewing time had the highest chemical content consisting of the total phenolic content (206.42 mg GAE/100 g dry weight), the total anthocyanin content (0.887 mg/100 g dry weight), the ascorbic acid (0.602 mg/100 g dry weight) and DPPH (49.38 % inhibition) were significantly (p < 0.05). However, 2 g torch ginger with 10 min brewing time had the chemical content (the total phenolic, the total anthocyanin, the ascorbic acid and DPPH) as well as with the 5 g torch ginger tea with brewing time at 5 min. The sensory properties showed 5 g torch ginger tea with 10 min brewing time had high scores for color, flavor, taste and over all acceptance. Finally, 5 g torch ginger and 10 min brewing time was recommended as the best condition. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.
The role of food waste hierarchy as Thai hotels seek to fulfill their corporate social responsibility
(Elsevier Ltd, 2022) Patranit Srijuntrapun; Patinya Sukwong; Alan Marshall; P. Srijuntrapun; Faculty of Social Sciences and Humanities, Mahidol University, Nakornpathom, Phuttamonthon 4 Rd., Salaya, 73170, Thailand; email: nisa_lay@hotmail.com
Although food waste reduction has been recognized as an important method for managing the environment in the past, it has not received much attention from the hotel business sector. This article reveals that food waste hierarchy is an important strategy for hotels, as it helps them to reduce food waste at the generation point, while reducing food costs and protecting the environment. The process of food waste reduction can be holistically integrated with the distribution process. The study found that there were significant differences related with hotel size in the 7-step food distribution process. The mean distribution process of large hotels is higher than the one of medium and small hotels. The results also show that the hierarchy of food waste management motivates the hotel business sector to implement food waste reduction by ensuring that hotel operations achieve Corporate Social Responsibility (CSR) goals in the form of Creating Shared Value (CSV). The primary goal of CSR is to align corporate and social values. © 2022 The Author(s)
Hydrodynamics and Heat Transfer Analysis of Airflow in a Sinusoidally Curved Channel
(Tech Science Press, 2022) Abid A. Memon; M. Asif Memon; Kaleemullah Bhatti; Thanin Sitthiwirattham; Nichaphat Patanarapeelert; T. Sitthiwirattham; Mathematics Department, Faculty of Science and Technology, Suan Dusit University, Bangkok, 10300, Thailand; email: thanin_sit@dusit.ac.th
For heat transfer enhancement in heat exchangers, different types of channels are often tested. The performance of heat exchangers can be made better by considering geometry composed of sinusoidally curved walls. This research studies the modeling and simulation of airflow through a 2¹ units long sinusoidally curved wavy channel. For the purpose, two-dimensional Navier Stokes equations along with heat equations are under consideration. To simulate the fluid flow problem, the finite element-based software COMSOL Multiphysics 5.4 is used. The parametric study for Reynolds number from Re = 100 to Re = 1000 and the period of vibration P from 0 to 5 are observed. The surface plots, streamline patterns, contours, and graphs are presented for the velocity field magnitude, temperature, and pressure against the Reynolds number as well as period of vibration. The results are compared with various literature. It is found that due to the creation of periodic contraction regions the velocity magnitude of the flow is continuously increasing with the increase of Reynolds number, on the contrary the pressure is decreasing from inlet to outlet of the channel. Also, a periodic variation in the pressure distribution along the vibrating boundaries has been found with an average increase of 500% for the high Reynolds number. A novel work was done by expressing the rotation rate per second in terms of local Reynolds number for the recirculating regions found due to the periodic oscillation of the boundaries. The average temperature near the outlet where a fixed temperature is imposed initially is decreasing with an increase in Reynolds number. The convection process is weakened due to an increase of periodic vibration of boundaries. © 2022 Tech Science Press. All rights reserved.
The Study of Homestay Management: Key Factors Affecting Homestay Service Expectations in Phra Nakhon Si Ayutthaya Province
(Research and Development Institute Suan Dusit University, 2022) Jirat Chuanchom; Yutthapong Leelakitpaisarn; Pornpen Traiphong; Sarid Sriyothin; Pimmada Wichasin; Nongluck Popichit; Tananyaphat Srinathiyawasin; Chayapon Chomchaiya; J. Chuanchom; Faculty of Management Science, Suan Dusit University, Bangkok, 10300, Thailand; email: chiruchchiruch@hotmail.com
The objective of this research was to study homestay management in correlation with service expectations for homestays and to study the potential of homestay management and the affects to service expectations for homestays. The researcher conducted a random survey of tourist who visited homestays in Phra Nakhon Si Ayutthaya Province. The quantitative approach using semi-structured questionnaires to collect data from the sample group that consisted of 400 Thai tourists agedbetween 20-60 years. The statistical tools used in the data analysis included percentage, mean and standard deviation and Cronbach's Alpha was used to assess the reliability of the questionnaire at .996. Multiple regression analysis was also used to test the correlation among the variables. The findings showed relationships with the potential of homestay management were correlated with the expectation of service of homestays in accommodating tourists at a high level of .671, and the potential of homestays management of entrepreneurs that affect their service expectations for homestay with a 0.05 level of significance level. As a result, the prediction was presented in the Equation: _ = .095 + (.345Fin) + (.072Pro) + (.269Cus) + (.811Learn) means the value of Finance, Customer and Learning & Growth when it increases by 1 unit Y (service expectations for homestay), it increases to .095 + (.345) + (.072) + (.269) + (.811) = 1.592. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.
Two-dimensional Haar Wavelet Method for Numerical Solution of Delay Partial Differential Equations
(Hindawi Limited, 2022) Rohul Amin; Nichaphat Patanarapeelert; Muhammad Awais Barkat; Ibrahim Mahariq; Thanin Sitthiwirattham; T. Sitthiwirattham; Mathematics Department, Faculty of Science and Technology, Suan Dusit University, Bangkok, Thailand; email: thanin-sit@dusit.ac.th
In this paper, a two-dimensional Haar wavelet collocation method is applied to obtain the numerical solution of delay and neutral delay partial differential equations. Both linear and nonlinear problems can be solved using this method. Some benchmark test problems are given to verify the efficiency and accuracy of the aforesaid method. The results are compared with the exact solution and performance of the two-dimensional Haar collocation technique is measured by calculating the maximum absolute and root mean square errors for different numbers of grid points. The results are also compared with finite difference technique and one-dimensional Haar wavelet technique. The numerical results show that the two-dimensional Haar method is simply applicable, accurate and efficient. © 2022 Rohul Amin et al.
RiemannÐLiouville Fractional NewtonÕs Type Inequalities for Differentiable Convex Functions
(MDPI, 2022) Thanin Sitthiwirattham; Kamsing Nonlaopon; Muhammad Aamir Ali; HŸseyin Budak; K. Nonlaopon; Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand; email: nkamsi@kku.ac.th
In this paper, we prove some new NewtonÕs type inequalities for differentiable convex functions through the well-known RiemannÐLiouville fractional integrals. Moreover, we prove some inequalities of RiemannÐLiouville fractional NewtonÕs type for functions of bounded variation. It is also shown that the newly established inequalities are the extension of comparable inequalities inside the literature. Finally, we give some examples with graphs and show the validity of newly established inequalities. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
Effects of Different Particle Size Distribution and Insoluble Dietary Fiber Content from Pomelo by-Products on the Quality Characteristics of Rice Noodle Products
(Research and Development Institute Suan Dusit University, 2022) Suwanna Pichaiyongvongdee; Tita Foophow; Nujira Rasamipaiboon; Piyawan Youdee; S. Pichaiyongvongdee; School of Culinary Arts, Suan Dusit University, Bangkok, 10700, Thailand; email: suwanna_pic@dusit.ac.th
Rice noodles are a widely consumed food in Asia, including in Thailand. Nevertheless, this popular food is high in carbohydrates, but low in dietary fiber. Pomelo by-products (PBP) are a highly insoluble dietary fiber (IDF) source that has been investigated for fiber-fortified rice noodles with health benefits. This study was conducted to prove the effects of IDF in PBP at different levels (10 and 12.5%) of the rice flour and different particle size distributions (180 and 150 _m) on the moisture content, water activity, cooking weight, cooking loss, textural and sensory evaluation. The addition of IDF-PBP to rice noodles was found to have significant (p<0.05) effects on the colors of a*, b*, while cooking weights were increased in all samples. Cooking loss and tensile strength also decreased as compared to the control. The moisture content and water activity of rice noodles were between 8.66-9.14% and 0.32-0.36, respectively. When considering the addition of IDF-PBP at 10 and 12.5%, the findings revealed that the sample was not significantly different (p>0.05) in the cooking weight. However, when the particle size was reduced, the cooking weight increased. Cooking loss decreased when IDF-PBP was increased, and the particle size was reduced. The texture of the particle size distribution was 180 and 150 _m at levels 10% in tensile strength and showed not significant difference (p>0.05) as compared to the control rice noodles. Rice noodles with 10% IDF-PBP particle size distribution 150 _m showed the highest overall acceptability in sensory evaluation. The results revealed that adding IDF-PBP to rice noodles increased the total dietary fiber content at 9.44% and the insoluble dietary fiber content at 8.71% as compared to the control rice noodles. Based on the results, the addition of IDF-PBP to rice noodles can lead consumers to conclude that the product is healthy. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.
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.ir
In 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).
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.th
In 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.
Integration of Kouprey-Inspired Optimization Algorithms with Smart Energy Nodes for Sustainable Energy Management of Agricultural Orchards
(MDPI, 2022) Pannee Suanpang; Pattanaphong Pothipassa; Kittisak Jermsittiparsert; Titiya Netwrong; P. Suanpang; Faculty of Science and Technology, Suan Dusit University, Bangkok, 10300, Thailand; email: pannee_sua@dusit.ac.th
Energy expenditure is now a major cost for agribusiness and community-based tourism in Thailand. Both types of businesses can also generate huge amounts of income for the country each year. This is a result of operators having to share part of their income with utility bills each month. As a result, the net return is lower than the operator should receive. Recognizing the need for energy management for sustainable use in agriculture focusing on durian cultivation in Kantharalak district and community tourism in Sisaket province, this research used a newly developed optimization algorithm called Kouprey-inspired optimization (KIO) to assist energy management in smart agriculture to support community-based tourism. This was initiated with a smart energy node to reduce the energy and labor costs for volcanic durian planting and accommodation in community-based tourist attractions in Sisaket province. The results showed that the combination of the KIO algorithm and smart energy node allowed for efficient management of the volcanic durian orchards and the use of clean energy in combination with traditional electric power for volcanic durian cultivation and community-based tourism. As the research area in Sisaket province had eight hours of solar power per day, this was sufficient for smart agriculture and community-based tourism in the daytime and in the evening. Furthermore, this allowed operators in both the agricultural and tourism sectors to reduce the labor costs of the durian orchard business and community-based tourism by about 30%, and in the energy sector, the costs could be reduced by 50%. As a consequence, this prototype would lead to the expansion and trial in durian orchards in the Eastern Economic Corridor area, which is an important economic area producing durian for export of the country. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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.com
This 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.
The Effect of Health Literacy on Self-Management Related to Food Consumption among Older Adults with Hypertension in the Community
(Research and Development Institute Suan Dusit University, 2022) Rungnapa Pongkiatchai; Sresuda Wongwiseskul; Orranuch Chusri; R. Pongkiatchai; Faculty of Nursing, Suan Dusit University, Bangkok, 10300, Thailand; email: rungnapa_pon@dusit.ac.th
The study aimed to study the effect of the health literacy program on self-management related to food consumption among older adults with hypertension in the community. The study design was quasi-experimental study with pre and posttest groups. The participants consisted of 64 older adults with hypertension who were randomly assigned to an experimental and control group. Participants in experimental group received health education and six sessions of health literacy. Each session lasted 20-60 minutes within eight weeks. Control group received usual care and health education from health provider. self-administration questionnaire (nutrition literacy, food consumption pattern and self-management) was used to collect the data. Data were analyzed using independent t-test. Group reflection was analyzed using content analysis. Results showed that mean score of nutritional literacy, food consumption and self-management of the experiment group was significantly higher than the mean score of the control group (p-value <.001). Results from the reflection in the experimental group suggested some issues, including the understanding, access to information and applying knowledge. Participants suggested the methods to enhance health literacy for self-management on food consumption including providing knowledge, communication, sharing experiences and using photographic media. In sum, health literacy program can be used as a tool to enhance knowledge related to health. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.
Quality and Consumer Acceptance of Ready to Drink Horse Mango (Mangifera foetida Lour.) Juice
(Research and Development Institute Suan Dusit University, 2022) Dudsadee Sapbua; Thippika Thorarit; Saowapan Palasuwan; D. Sapbua; School of Culinary Arts, Trang Center, Suan Dusit University, Trang, 92130, Thailand; email: dudsadee_sap@dusit.ac.th
Horse mango (Mangifera foetida Lour.) fruit is rich in nutrition and is characterized by soft pulp-like mango that is suitable to prepare for ready-to-drink juice. The purpose of this study was to examine the physical properties, chemical properties, microbiological test, sensory evaluation and consumer acceptance test of the horse mangoesÕ pulp and juice. Ready-to-drink Horse mango juice with 3 concentrations of pulp (20, 40 and 60%) was pasteurized and poured into glass bottles. The results showed that the physical properties of Horse mango pulp were observed at L*(68.78), a*(-13.24), b*(50.26), pH (3.37) and Total Soluble Solids (15.17oBrix). The content of chemical quality of Horse mango pulp reported carbohydrate, protein, fat, ash, vitamin C per 100 g of pulp as 12.67 g, 0.74 g, 0.48 g, 0.95 g, 29.98 mg, respectively and beta-carotene as 0.86 mg/kg. In reference to the Horse mango juice, the result of the coloring content was shown as b* values (yellowness) increased with a higher amount of Horse mango pulp related to beta-carotene (the yellow pigment). The microbiological content of the 3 concentrations of Horse mango juice aligned to the Thai Community Product Standard (TCPS) 701/2557 because of pasteurization (90 ¡C 10 min) during the juice productions. The ready-to-drink at 40% of Horse mango juice received the highest score on all attributes (color, odor, flavor, taste and overall liking) and was analyzed for chemical content; carbohydrate, protein, fat, ash, vitamin C per 100 g of juice as 21.50 g, 2.27 g, 0.04 g, 0.33 g, 10.29 mg, respectively and beta-carotene content as 0.61 mg/kg. For the acceptance of 100 consumers, consumer accepted 70% of juice products and decided to buy ready-to-drink Horse mango juice products at 66%. However, many consumers are still unfamiliar with Horse mango therefore adding another juice for example, pineapple and orange juices could obtain more acceptance. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.
THE IMPACT OF BRAND IMAGE ON BRAND LOYALTY: THE MEDIATING ROLE OF BRAND LOVE
(Social Sciences Research Society, 2022) Tomnak Mahothan; Tipparat Laohavichien; Thongchai Srivardhana; Wichan Lertlop; Anchana Lakviramsiri; Panamon Chantabutr; T. Mahothan; College of Innovation and Management, Suan Sunandha Rajabhat University, Kasetsart University, Thailand; email: Tomnak.Mahothan@gmail.com
Brand loyalty is essential for maintaining a businessÕs clients. Numerous studies have been conducted to investigate its causes and effects. However, this research does not adequately explain brand loyaltyÕs cognitive and emotional antecedents, particularly for expensive products. Prior research viewed brand image as a cognitive component of consumer behavior. In contrast, brand love is a dynamic marketing construct that has been found to influence crucial marketing variables such as word-of-mouth and buy intent. Consequently, the purpose of this article is to validate a model that examines the antecedents of brand loyalty, namely brand image and brand love, in the context of the mobile sector. The conceptual model and accompanying hypotheses are evaluated using a sample of 400 mobile industry consumers. The data were examined using structural equation modeling. The results indicate robust links between brand image and brand love, as well as between brand love and its consequence (brand loyalty). © 2022
Evaluation of Terminalia chebula Retz. Extract Against Caries-associated Bacteria as an Alternative Compound for Oral Care Products
(Research and Development Institute Suan Dusit University, 2022) Piyanuch Prompamorn; Khwunjit Itsarasook; Jitrawadee Tanghiranrat; Chanchai Tripetch; Kanlayaporn Chantree; P. Prompamorn; Faculty of Science and Technology, Suphanburi Campus, Suan Dusit University, Suphanburi, 72000, Thailand; email: Piyanuch_pro@dusit.ac.th
The objective of this study was to investigate the efficiency of Terminalia chebula Retz. fruit extract for further use as an active ingredient in oral care products. The quantification of major constituent, the antioxidant activity and antibacterial activity of an extract against Streptococcus mutans in both planktonic and biofilm form were measured. The results showed that ellagic acid was the major constituent of an extract and the amount of ellagic acid contained in the extract was 36.671 mg/g. The extract exhibit free radical scavenging activity with IC50 value of 0.44±0.01 mg/mL by DPPH assay. For antibacterial activity against S. mutans, T. chebula Retz. extract possess high inhibitory effect on S. mutans in both planktonic form and biofilm form. The MIC50 and MBC value of an extract against planktonic form of S. mutans were 0.47±0.28 and 6.25 mg/mL, respectively. For biofilm form of S. mutans, the extract has a high capability to preventing biofilm formation and eradicating the existing biofilm. The MBIC50 and MBEC50 of an extract against biofilm form of S. mutants were 4.47±0.32 and 9.64±0.39 mg/mL, respectively. © 2022, Research and Development Institute Suan Dusit University. All rights reserved.
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.ir
In 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.
On Hilfer-Type Fractional Impulsive Differential Equations
(Hindawi Limited, 2022) Chanisara Metpattarahiran; Kulandhaivel Karthikeyan; Panjaiyan Karthikeyann; Thanin Sitthiwirattham; T. Sitthiwirattham; Mathematics Department, Faculty of Science and Technology, Suan Dusit University, Bangkok, 10300, Thailand; email: thanin_sit@dusit.ac.th
Using the Schauder fixed point theorem, we prove the existence of impulsive fractional differential equations using Hilfer fractional derivative and nearly sectorial operators in this paper. We've gone over the two scenarios where the related semigroup is compact and noncompact for this purpose. We also go over an example to back up the main points. © 2022 Chanisara Metpattarahiran et al.
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.th
This 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.
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.th
Autonomous 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.
Effects of land-use change on the volume of water flow into the Mun Bon reservoir in Nakhon Ratchasima Province, Thailand
(Applied and Natural Science Foundation, 2022) Surachat Sinworn; Nuttabodee Viriyawattana; N. Viriyawattana; Science and Technology, Suan Dusit University, Bangkok, Thailand; email: nutta_v@hotmail.com
The land-use patterns in watershed areas in the Chorakhe Hin Sub-district, Khon Buri District, Nakhon Ratchasima Province, Thailand, have been found to change from forest areas. Different agricultural areas cause variations in the amount of water that flows from the stream into the reservoir, potentially leading to future water shortages. This study was conducted to explore the effects of land-use change on the volume of water flow into the Mun Bon Reservoir, Chorakhe Hin Sub-district, Khon Buri District, Nakhon Ratchasima Province, Thailand. The model analysis techniques, namely MarkovÕs Chain CLUES and SWAT, were employed to predict the effects of land-use patterns in the area of the upper Mun River on the volume of water flow into the Mun Bon reservoir. According to the predictions obtained based on the land-use models, forest areas may be converted into cassava plantations by 2029. When the comparative effects were considered, the normal volume of water flowing into the Mun Bon reservoir was found to be equivalent to 96 million cubic meter per year. The predicted volume before Christ (A.D.) 2029 is 30 million cubic meter. Accordingly, the water volume in the Mun Bon reservoir would be lower than that derived from the usual land-use patterns. © 2022, Applied and Natural Science Foundation. All rights reserved.

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