Ramkhamhaeng International Journal of Science and Technology

Some Examples of a Hypergroup (ℤₙ ,∘ₘ ℤₙ)

Witthawas Phanthawimol — 2025-12-31

Let G be a group and N a normal subgroup of G. If the hyperoperation ∘ₙ is defined by

x ∘ₙ y = (xy)N for all x, y ∈ G,

then (G, ∘ₙ) is a hypergroup. Since mℤₙ is a normal subgroup of ℤₙ, (ℤₙ, ∘ₘℤₙ) is a hypergroup.

In this paper, we let G∣ₙH = {g ∘ₙ H ∣ g ∈ G} and give some examples that G∣ₘℤₙ kℤₙ equals ℤₙ/kℤₙ.

We take a hyperoperation ∘ₙ to construct cosets of any subgroup H of G instead of coset multiplication by the binary operation of G and study some examples of this new structure of cosets.

Assessment of Coral Mortality in Mu Ko Chumphon National Park, Western Gulf of Thailand, Following the 2024 Mass Bleaching Event

Charernmee Chamchoy — 2025-12-31

Climate-induced coral bleaching poses a

major threat to tropical reef ecosystems, driving rapid habitat degradation, altered community structure, and long-term biodiversity decline. Thermal anomalies in 2024 triggered mass bleaching across the Western Gulf of Thailand, including reefs within Mu Ko Chumphon National Park, Thailand. his study examined the extent of bleaching and coral mortality at Ko Ngam Noi, Mu Ko Chumphon National Park, following the 2024 bleaching event. Field observations recorded 21 scleractinian coral species distributed across the reef complex. During peak thermal stress, more than 80% of total live-coral cover exhibited acute paling to full bleaching, with the highest stress prevalence observed in branching Acropora and massive Porites functional guilds. Acropora muricata and Porites rus experienced the highest bleaching prevalence, indicating genus-level sensitivity patterns consistent with fast-growing, branching, and massive reef-building functional groups. Post-bleaching mortality accounted for 4.8% of the total reef area, with the greatest mortality concentration in Acropora divaricata and Platygyra sinensis, mapped as contiguous patches of recently dead colonies, tissue-loss skeletons, and algal overgrowth succession zones. Despite relatively low overall reef mortality compared to bleaching prevalence, clear species-specific divergence emerged in survival trajectories, bleaching remission, and early stress-recovery signals, demonstrating marked differences in bleaching tolerance, recovery capacity, and structural resilience. The results indicate that a small proportion of colonies incurred irreversible physiological failure, while most surviving colonies displayed sub-acute recovery responses, suggesting the reef is entering a regeneration phase mediated by heat-tolerant taxa and partial assemblage turnover. These findings underline the ecological significance of species-level resilience heterogeneity in buffering reef collapse, and reinforce the need for adaptive spatial governance, targeted coral-nursery reinforcement, and evidence-driven restoration planning to sustain reef functional recovery, enhance climate resilience, and safeguard reef-associated biodiversity critical for fisheries and ecotourism economies in Thailand.

The Solution Sets of ⌈x⌉² − 𝑐 = 0, ⌈x²⌉ − 𝑐 = 0 and x⌈x⌉− 𝑐 = 0 where 𝑐 is a Real Number

Sirirat Singhun — 2025-12-31

The ceiling function of a real number , denoted by , is the least integer greater than or equal to . In this article, the solution sets of and , where is a real number are shown.

Closed (a, a + 1)-Knight’s Tours on some Square Tubes

Kharinthip Boonprasit — 2025-12-31

In this article, we present sufficient and necessary conditions for the (2a + 1, 2a + 1, k, a)-tube where is a positive integer and a {2, 3, 4} to have closed (a, a + 1)-knight’s tours. Moreover, closed (a, a + 1)-knight’s tours on the (2a + 1, 2a + 1, k, a)-tube are shown if it exists.

Hamilton-Connectedness of Some Cubic 3-connected Plane Graph

Adthasit Sinna — 2025-12-31

We define a pupa graph which is a cubic 3-connected plane graph. In this paper, we show that a pupa graph is hamilton-connected if , both k and l are even, is odd, and for every .

ChatGPT’s Perspectives on Its Role as a Language and Cultural Partner: Enhancing English Language Acquisition and Intercultural Competence

Rachawit Photiyarach — 2025-12-31

The growing use of generative artificial intelligence (AI) in language learning and intercultural education has attracted increasing scholarly attention, yet existing research has largely focused on learner outcomes, user perceptions, and institutional responses. Comparatively little attention has been paid to how generative AI systems themselves conceptualise and articulate their educational role. Addressing this gap, this study examines ChatGPT’s self-representation as a form of educational discourse, treating the system as an object of qualitative inquiry rather than as a tool or human-like agent. Guided by thing ethnography, the study analyses ChatGPT’s responses to structured interview-style prompts related to language learning, intercultural competence, ethics, contextual constraints, and future roles. Data were analysed using thematic analysis and interpreted through Bronfenbrenner’s bioecological (PPCT) framework. The findings indicate that ChatGPT consistently positions itself as a supportive but non-authoritative resource, emphasising adaptability while foregrounding ethical limitations, contextual dependence, and the continued centrality of human agency in AI-mediated education.

Isolation and Selection of Crude Oil-Degrading Bacteria from Coastal Soil of Ko Samet, Rayong Province, Thailand

Phichamon Noisuwan — 2025-12-31

Oil spill incidents along Thailand’s coastal areas, particularly in Rayong Province, have caused severe ecological and economic impacts. Bioremediation using indigenous microorganisms capable of degrading hydrocarbons offers a sustainable and environmentally friendly alternative to conventional cleanup methods. This study aimed to isolate and identify microorganisms from soils and sediments collected from three coastal sites around Ko Samet—Ao Phrao, Ao Tawan, and Ao Kluai Na Nok—and to evaluate their crude oil degradation potential. A total of 144 isolates were obtained and screened for oil-degrading activity using Bushnell-Haas Mineral Salt (BHMS) medium supplemented with 1% crude oil. Twenty-eight isolates exhibited crude oil degradation ability, with isolates 1ATIII 4, 1APII 6, and 2ATI 15 showing the highest performance, leaving only 0.0866 g, 0.0924 g, and 0.0965 g of residual oil, respectively. Biochemical profiling revealed diverse carbon source utilization patterns, which correlate with the potential production of biosurfactants and oil-degrading enzymes. The findings suggest that indigenous microorganisms from Ko Samet hold strong potential for the development of crude oil bioremediation technologies applicable at both laboratory and field scales

Innovative Integration of Marketing and Tourism for the Elderly and Community Economy in Ubon Ratchathani

Sidanuch Kittisareekul — 2025-12-31

This research aims to develop an approach to "Innovative Integration of Marketing and Tourism for the Elderly and Community Economy in Ubon Ratchathani" by employing the service marketing mix framework (7Ps) and integrating the concepts of active aging and lifelong learning. The methodology is qualitative research. Data were collected through semi-structured in-depth interviews with stakeholders from tourism organizations at the provincial and national levels and with elderly people in the Mekong River basin area of Ubon Ratchathani Province (n=10). Data were analyzed using content analysis and synthesized according to the 7Ps framework categories. The research findings suggest that we can transform cultural identity, local cuisine, and handicrafts into "narrative-based tourism experiences," with elderly individuals acting as cultural transmitters. Implement value-based pricing schemes and revenue-sharing arrangements, such as funds for the elderly. (3) Place: An integrated offline and online model should be implemented through community markets, utilizing Facebook, LINE, and TikTok for bookings and communication via intergenerational collaboration. Promotion: Digital social media marketing ought to portray senior individuals as "authentic storytellers" to elevate the destination's image. Elderly individuals ought to function as local tour guides or homestay hosts, necessitating instruction in service capabilities, communication abilities, and internet literacy. Service methods must be standardized to encompass booking, payment, and satisfaction assessment, all executed via digital channels. Improvements to the physical environment should include infrastructure enhancements that accommodate elderly individuals, such as signage, ramps, bathrooms, and QR code systems featuring audio commentary narrated by seniors. In conclusion, the integration of the 7Ps framework with active aging and lifelong learning concepts facilitates the transformation of elderly people's role from "dependents" to "social innovation creators," converting cultural capital into tangible household and community income. Policy recommendations include developing digital skills, narrative-based communication strategies, upgrading infrastructure, and establishing revenue-sharing mechanisms to propel Ubon Ratchathani toward becoming a sustainable tourism destination in the Mekong River basin region.

A Confirmatory Factor Analysis of Lifestyle Components among Upper Secondary School Students in the Digital Era

Nithipat Rajphandin — 2025-12-31

In the rapidly evolving digital era, understanding the lifestyle patterns of Generation Z students has become essential for educators and policymakers. This quantitative study aimed to analyze both the exploratory and confirmatory factor structures of the lifestyle model among upper secondary school students in Thailand. The sample consisted of 500 Generation Z students selected through stratified random sampling. Data were collected using a questionnaire approved by the Human Research Ethics Committee, University of the Thai Chamber of Commerce (No. UTCCEC/Exemp106/2025). Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) were employed to validate the model structure. The results revealed three lifestyle dimensions based on the AIO framework: (1) “Experiential and Social Attraction” (Activity), (2) “Sustainable and Self-Development Lifestyle” (Interest), and (3) “Lifelong Learning and Social Engagement Lifestyle” (Opinion). The model demonstrated an acceptable fit with the empirical data. The findings contribute to the theoretical development of digital-era lifestyle measurement and provide practical implications for educational institutions seeking to enhance student engagement in Thailand.

Components of Prominent Beauty Influencers in Thailand during the Digital Era

Thamaphon Klotkanokpan — 2025-12-31

Marketing and marketing communication in the digital age have reshaped the way consumers interact with brands and make purchasing decisions. Within this dynamic environment, social media has become a dominant platform where influencers act as opinion leaders, shaping perceptions and guiding consumer behavior. In Thailand—where the beauty industry is highly competitive and social media engagement is among the highest in Southeast Asia—beauty influencers play a particularly influential role in promoting trust, authenticity, and cultural resonance. This study aims to identify the essential components that characterize prominent beauty influencers in the Thai digital context. A quantitative research design was employed using survey data collected from 645 consumers across five regions of Thailand. The data were analyzed using Exploratory Factor Analysis (EFA) to determine the underlying dimensions of influence. The findings reveal five key components defining influential beauty opinion leaders: (1) Diverse Identity and Image, reflecting inclusivity and representation; (2) Credibility and Responsible Communication, emphasizing transparency and ethical engagement; (3) Expertise and Role Model Image, highlighting knowledge, professionalism, and inspiration; (4) Sociocultural Relevance, demonstrating alignment with Thai cultural values and social trends; and (5) Communication Style and Image Presentation, focusing on aesthetic consistency and audience connection. These findings contribute to both theoretical and practical domains by enhancing understanding of influencer marketing within Southeast Asian cultural contexts. Practically, they provide insights for marketers, brands, and content creators in designing strategic communication frameworks that strengthen consumer trust, foster authentic engagement, and promote positive digital citizenship through beauty influencers in Thailand.