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A Panel Partial Break Model For Forecasting Stock Returns With Parameter Instability, Nuttapat Bumrungrat
A Panel Partial Break Model For Forecasting Stock Returns With Parameter Instability, Nuttapat Bumrungrat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Predicting stock returns is one of the most fascinating problems in finance. However, predicting stock returns is also one of the most challenging problems due to the instability and noisy nature of stock returns. One of the promising directions to handle both problems is to use a panel break model. Recently, a panel common break model has been proposed and shown to generate superior predictive performance. However, the model assumes that every parameter breaks simultaneously, which is not aligned with empirical data. In this article, we propose a novel panel break model that addresses the main limitation of the common …
Cross-Lingual Speech Emotion Recognition Using English And Mandarin On Thai Data, Kantapong Wonghirunruch
Cross-Lingual Speech Emotion Recognition Using English And Mandarin On Thai Data, Kantapong Wonghirunruch
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study explores the efficacy of cross-lingual Speech Emotion Recognition (SER) using Thai as a target language with training sets in English and Mandarin. The study evaluates the adaptability of SER models across linguistic boundaries, emphasizing the challenges and potential of leveraging well-resourced languages to enhance emotion recognition capabilities in a language with fewer resources. Through a series of experiments, the research investigates three primary aspects: the performance of same-corpus training within Thai, cross-lingual model application from English and Mandarin to Thai, and the effectiveness of transfer learning techniques in improving model accuracy. The findings indicate that Mandarin facilitates more …
Option Pricing Based On A Stochastic Volatility With Co-Jump Model And Application In Thai Market, Lu Tang
Option Pricing Based On A Stochastic Volatility With Co-Jump Model And Application In Thai Market, Lu Tang
Chulalongkorn University Theses and Dissertations (Chula ETD)
The correlated jumps in returns and volatility serve different, but complementary purposes in studying asset dynamic properties. In this paper, we choose Heston’s square-root stochastic volatility model, simultaneously incorporating jumps in returns and volatility, and propose a closed-form solution for European call option pricing. Applied to SET50 index in Thailand stock market, comparisons between the stochastic volatility with co-jump (SVCJ) model and the classical stochastic volatility (Heston) model are made to emphasize the significance of contemporaneous jumps appeared in asset dynamics. Empirical research demonstrates the superiority of SVCJ model in both out-of-sample pricing and hedging performance.
Biomarkers Of Comorbid Major Depression And Metabolic Syndrome: A Case-Control Study, Ketsupar Jirakran
Biomarkers Of Comorbid Major Depression And Metabolic Syndrome: A Case-Control Study, Ketsupar Jirakran
Chulalongkorn University Theses and Dissertations (Chula ETD)
Mood disorders, including major depressive disorder (MDD), are among the leading causes of disability worldwide. Major depressive disorder (MDD) and bipolar disorder (BD) often coexist with metabolic syndrome. Increased atherogenicity and a higher risk of cardiovascular diseases are associated with both conditions. This study aimed to determine whether (a) ACEs are significantly associated with the 5 BFI personality dimensions in patients with MDD; (b) increased neuroticism or lowered levels of the other personality dimensions are associated with the phenome of MDD including suicidal behaviors; and (c) the effects of ACEs on the phenome of MDD are mediated via increased neuroticism …
การพัฒนาเครื่องมือปัญญาประดิษฐ์ช่วยตรวจสอบความถูกต้องตามกฎหมายของข้อมูลผลิตภัณฑ์เสริมอาหารบนแพลตฟอร์ม E-Commerce ในประเทศไทย, ชวลิน อินทร์ทอง
การพัฒนาเครื่องมือปัญญาประดิษฐ์ช่วยตรวจสอบความถูกต้องตามกฎหมายของข้อมูลผลิตภัณฑ์เสริมอาหารบนแพลตฟอร์ม E-Commerce ในประเทศไทย, ชวลิน อินทร์ทอง
Chulalongkorn University Theses and Dissertations (Chula ETD)
ปัจจุบันแพลตฟอร์มพาณิชย์อิเล็กทรอนิกส์มีบทบาทสำคัญในระบบสุขภาพในด้านเป็นแหล่งข้อมูลและช่องทางการเข้าถึงผลิตภัณฑ์เสริมอาหารในกลุ่มผู้บริโภคไทย แต่ขณะเดียวกันกลับพบการกระทำผิดกฎหมายเป็นจำนวนมาก วัตถุประสงค์ เพื่อพัฒนาเครื่องมือปัญญาประดิษฐ์ช่วยตรวจสอบความถูกต้องตามกฎหมายของข้อมูลผลิตภัณฑ์เสริมอาหารบนแพลตฟอร์มพาณิชย์อิเล็กทรอนิกส์ในประเทศไทย ใช้รูปแบบการวิจัยแบบผสมผสาน มีกระบวนการ 3 ระยะ ระยะที่ 1 เป็นการพัฒนาต้นแบบปัญญาประดิษฐ์ช่วยตรวจสอบความถูกต้องตามกฎหมายของข้อมูลผลิตภัณฑ์เสริมอาหารบนแพลตฟอร์มพาณิชย์อิเล็กทรอนิกส์ ระยะที่ 2 เป็นการทดสอบความไวและความจำเพาะของต้นแบบ และระยะที่ 3 เป็นการศึกษาความเห็นของผู้ใช้งานเป้าหมายต่อการนำปัญญาประดิษฐ์ไปใช้งาน ผลการวิจัย ระยะที่ 1 พบความชุกของการกระทำผิดเกี่ยวกับการจำหน่ายผลิตภัณฑ์เสริมอาหารบนแพลตฟอร์มพาณิชย์อิเล็กทรอนิกส์ที่นิยมในประเทศไทยอยู่ที่ร้อยละ 84.6 ผู้มีส่วนได้ส่วนเสียหลักมีความเห็นในการพัฒนาต้นแบบว่าควรมีการจัดการที่มาของนวัตกรรมที่น่าเชื่อถือ การเชื่อมโยงการทำงานกับผู้ให้บริการ การออกแบบให้สามารถจำแนกความผิดและรวบรวมข้อมูลส่งกลับให้ผู้เกี่ยวข้องได้ เป็นการสร้างรายได้ การสร้างแรงกดดันทางสังคม และการนำเสนอคุณค่า ในระยะที่ 2 การทดสอบต้นแบบปัญญาประดิษฐ์มีค่าความไว ร้อยละ 56.4 และความจำเพาะ ร้อยละ 89.0 ส่วนระยะที่ 3 พบว่าตัวแทนองค์ผู้ใช้เป้าหมายให้ความสนใจปัญญาประดิษฐ์ อย่างไรก็ตามควรปรับปรุงให้การจำแนกความผิดมีความซับซ้อนลดลงแต่สอดคล้องกับการนำไปใช้งานมากขึ้น กลยุทธ์ที่ควรทำคือ การสื่อสารคุณค่าของปัญญาประดิษฐ์ในส่งเสริมการค้าเชิงสร้างสรรค์ และลดความเสี่ยงทางกฎหมายมากกว่าการบังคับเชิงกฎหมาย ซึ่งองค์ความรู้ที่ได้จากงานวิจัยสามารถนำไปเป็นแนวทางเพิ่มศักยภาพการคุ้มครองผู้บริโภคในยุคดิจิทัลได้
A Comparative Study Of Portal Versus Peripheral Circulating Tumor Cells In Patients With Stage I-Iii Pancreatic Cancer, Thaninee Prasoppokakorn
A Comparative Study Of Portal Versus Peripheral Circulating Tumor Cells In Patients With Stage I-Iii Pancreatic Cancer, Thaninee Prasoppokakorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Portal venous circulating tumor cells (CTCs) detection may better reflect vascular metastasis and predict micro-metastasis risk in pancreatic ductal adenocarcinoma (PDAC) than peripheral blood. We hypothesize that portal CTCs could better represent micro-metastasis and predict survival in PDAC patients. Methods: We conducted a single-center, prospective interventional cohort study of patients with stage I-III PDAC between January 2020 and September 2021, with followed up until February 2024. Portal venous blood was obtained via endoscopic ultrasound (EUS)-guided sampling, and peripheral blood was collected on the same day. CTCs were detected using EpCAM and mucin1 antibodies and reported as cells/8mL of blood. …
Sugar Composition Of Thai Desserts And Gut Microbiome Profiles In Healthy Volunteers: A Randomized Controlled Trial, Sayamon Senaprom
Sugar Composition Of Thai Desserts And Gut Microbiome Profiles In Healthy Volunteers: A Randomized Controlled Trial, Sayamon Senaprom
Chulalongkorn University Theses and Dissertations (Chula ETD)
The glycemic index (GI) measures the blood glucose-raising potential of carbohydrate-rich foods and is associated with obesity and insulin resistance. In addition, an imbalanced gut microbiota has been linked to elevated postprandial blood glucose levels. However, the relationship between consuming Thai desserts predominantly composed of carbohydrates and gut microbiome profiles remains unclear. This study aimed to evaluate the effects of consuming various Thai desserts with different GI values on the gut microbiomes of healthy volunteers. This open-label, parallel randomized clinical trial involved 30 healthy individuals aged 18 to 45 years. Participants were randomly assigned to one of three groups: Phetchaburi’s …
Profiling The Microbiome In Breast Cancer Patients Before And After Treatment With Cannabis Oil, May Soe Thu
Profiling The Microbiome In Breast Cancer Patients Before And After Treatment With Cannabis Oil, May Soe Thu
Chulalongkorn University Theses and Dissertations (Chula ETD)
With long-term cancer treatment, female breast cancer patients encounter debilitating side effects from a current range of cancer therapies. Cannabinoids (CBs) have been widely used due to their efficacy on chemotherapy-associated pain. Although there is some evidence that cannabis oil may enhance quality of life and lessen symptoms in people with breast cancer, this is not very substantial. No randomised trials evaluating the effects of cannabis in breast cancer patients has been conducted before. The microbiome is critical to human health and disease, and accumulating data suggests that it is influenced by a variety of external variables, including marijuana, cannabis, …
The Analysis Of Electric Vehicle's Adoption And Impact Of The Stimulation Policy In Thailand, Theeradol Techa-Erawan
The Analysis Of Electric Vehicle's Adoption And Impact Of The Stimulation Policy In Thailand, Theeradol Techa-Erawan
Chulalongkorn University Theses and Dissertations (Chula ETD)
The Thai government aims to reduce greenhouse gas (GHG) emissions in the transportation sector and establish Thailand as an electric vehicle (EV) hub in Southeast Asia by 2025. This study focuses on battery electric vehicles (BEVs) due to their potential for reducing emissions. Given the importance of the motor vehicles and parts are Thailand’s third most valuable export category, with exports accounting for 59.5% of the country’s GDP in 2019—the study analyzes consumer preferences for EV attributes and explores public attitudes toward EV stimulation policies. A Discrete Choice Experiment (DCE) survey is conducted with 363 participants in Bangkok, revealing that …
Thailand As Gay-Friendly Destination In Indonesian Gay Men’S Perception, Sarah Geraldine Wullur
Thailand As Gay-Friendly Destination In Indonesian Gay Men’S Perception, Sarah Geraldine Wullur
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research explores the perception of Indonesian gay men toward Thailand as a gay-friendly destination. This study employs a qualitative approach, conducting in-depth interviews with 15 respondents aged 18 to 45 who identify as Indonesian gay individuals and have traveled to Thailand at least once, engaging in gay-related activities during their visit. The findings indicate that Indonesian gay men perceived Thailand favorably as a gay-friendly destination, due to its welcoming and progressive atmosphere. The society was viewed as accepting of gay culture, regardless of how individuals express themselves or their preferences. Moreover, the Y series emerged as the most significant …
Influence Of Out-Of-Home Advertising Value On Consumer Attitude And Purchase Intention Of Samsung Smartphones, Napat Kusolrerkdee
Influence Of Out-Of-Home Advertising Value On Consumer Attitude And Purchase Intention Of Samsung Smartphones, Napat Kusolrerkdee
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research investigates the influence of out-of-home (OOH) advertising value on consumer attitudes and purchase intention towards Samsung smartphones. Data were collected via an online survey from 304 male and female respondents, aged 25 to 60 years, residing in Bangkok, who had encountered at least one of Samsung's OOH advertisements, including outdoor, transit, and in-store advertisements, in the past week. The study reveals that all five dimensions of advertising value (i.e. informativeness, credibility, entertainment, irritation, and overall advertising value) significantly influenced attitude towards the advertisement while the credibility dimension was the sole dimension of advertising value impacting attitude towards the …
Thai Millennial Consumers’ Behavior Towards Nutrition And Health Claims On Food Packaging, Ruth Maura Prabaswara Wijayanti
Thai Millennial Consumers’ Behavior Towards Nutrition And Health Claims On Food Packaging, Ruth Maura Prabaswara Wijayanti
Chulalongkorn University Theses and Dissertations (Chula ETD)
This survey study examines the Thai millennial consumers' behavior towards nutrition and health claims (NHCs) on food packaging by studying the influences of consumers' perception on understanding, attitude, and purchase intention respectively. Data was collected through an online questionnaire from 272 Thai respondents, aged 28 to 43, and who had purchased food products with NHCs on the packaging. The findings reveal that among the influences between the four variables, consumer understanding has the highest degree of influence towards consumer attitude, followed by influences of consumer perception towards understanding, and consumer attitude towards purchase intention. The study concluded that consumer behavior …
Generation Z'S Consumer Attitudes, Social Media Engagement, And Purchase Intentions In The Art Toys Blind Box Market, Supanut Anuwongpukdeechat
Generation Z'S Consumer Attitudes, Social Media Engagement, And Purchase Intentions In The Art Toys Blind Box Market, Supanut Anuwongpukdeechat
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study explores Generation Z's consumer attitudes, social media engagement, and purchase intentions within the art toy blind box market, a niche yet rapidly growing industry driven by this demographic’s unique preferences. Using a quantitative approach, this research surveyed 205 Thai Generation Z respondents aged 18-27 to assess the relationship between their attitudes, levels of social media engagement, and purchase intentions related to art toy blind boxes. The findings reveal a strong positive correlation (r = 0.797) between social media engagement (M = 3.94) and purchase intentions (M = 4.07), highlighting the significant impact of online interactions on consumer behavior …
The Impact Of Customer Engagement On User Retention In E-Commerce Apps In Vietnam, Vu Nguyen Tran
The Impact Of Customer Engagement On User Retention In E-Commerce Apps In Vietnam, Vu Nguyen Tran
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines how customer engagement impacts user retention in Vietnamese e-commerce apps, focusing on symbolic, hedonic, and utilitarian dimensions. A survey of 465 Vietnamese Millennials and Gen Z users (18–34) who used Shopee and/or Lazada in the past six months found symbolic engagement, aligning apps with users' values and identity, to be the strongest predictor of retention. Hedonic engagement showed a minor negative impact, while utilitarian engagement had no significant effect. The findings underscore the importance of symbolic engagement in offering actionable insights for branding and retention strategies in Vietnam’s e-commerce market.
Effects Of Environmental Policy On Packaging Industry, Kittipong Nupak
Effects Of Environmental Policy On Packaging Industry, Kittipong Nupak
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the impact of Thailand's 2020 single-use plastic bag ban on the packaging industry, focusing on the comparative analysis of plastic and paper firms. Utilizing a SWOT analysis framework, the study evaluates the strengths, weaknesses, opportunities, and threats posed by the policy implementation. Data spanning from 2018 to 2022 on return on assets (ROA) for both industries is analyzed to discern trends and correlations with the policy. Findings reveal significant reductions in plastic pollution and heightened public awareness as strengths of the policy. However, challenges such as incomplete enforcement and market shifts to paper alternatives emerge as weaknesses. …
Effects Of The Japan – Thailand Economic Partnership Agreement (Jtepa) On Thailand’S Agricultural Trade With Japan, Kantawat Teeravithayapinyo
Effects Of The Japan – Thailand Economic Partnership Agreement (Jtepa) On Thailand’S Agricultural Trade With Japan, Kantawat Teeravithayapinyo
Chulalongkorn University Theses and Dissertations (Chula ETD)
This independent study investigates the impact of the Japan-Thailand Economic Partnership Agreement (JTEPA) on agricultural trade between Thailand and Japan. By employing the gravity model framework, the study analyzes the determinants of bilateral agricultural trade flows, focusing on key commodities such as meat, fish, seafood, edible preparations, and rice.The literature review highlights the significance of free trade agreements (FTAs) in facilitating trade and the potential benefits they offer to member countries. Studies on FTAs across various regions underscore the importance of reducing trade barriers and tariffs to promote agricultural trade flows.Utilizing panel data techniques, the empirical analysis examines the relationship …
The Impact Of E-Commerce On The Us Packaging Industry During The Covid-19 Era: A Case Study Of International Paper, Mark Suwannarat
The Impact Of E-Commerce On The Us Packaging Industry During The Covid-19 Era: A Case Study Of International Paper, Mark Suwannarat
Chulalongkorn University Theses and Dissertations (Chula ETD)
The COVID-19 pandemic had a significant impact on the packaging industries by speeding up the rise of e-commerce. This study examines the US market and focuses on International Paper Company in order to see how the industry has responded to changes brought about by pandemics. This paper highlights the potential and problems presented by e-commerce, such as labor shortages, growing costs, supply chain disruptions, and sustainability demands, using the SWOT and Porter's Five Forces frameworks. The pandemic highlighted the importance of innovative and flexible packaging solutions. Despite the challenges encountered by International Paper, the e-commerce surge also presents growth potential. …
Circular Economy Strategies For Sustainable Growth And Development In The Paper And Packaging Industry, Suwimon Saret
Circular Economy Strategies For Sustainable Growth And Development In The Paper And Packaging Industry, Suwimon Saret
Chulalongkorn University Theses and Dissertations (Chula ETD)
The paper and packaging industry in Southeast Asia is experiencing rapid growth, driven by economic expansion and a growing demand for sustainable solutions. This research investigates the potential of circular economy practices within this industry, focusing on the Thai market. A case study of SCG Packaging demonstrates a positive correlation between circular practices and economic performance, with their revenue from circular packaging products (reusable, recyclable, and compostable) increasing from 16% to 57% of total revenue within five years. However, limitations exist. The economic impact analysis relies on data from a single company, and further research encompassing a broader industry scope …
Market Entry Strategy For Black Garlic Supplements In Myanmar Through Partnership With Cmhl, Saw Yoon Yu Nan
Market Entry Strategy For Black Garlic Supplements In Myanmar Through Partnership With Cmhl, Saw Yoon Yu Nan
Chulalongkorn University Theses and Dissertations (Chula ETD)
The COVID-19 pandemic has significantly increased the demand for supplements, vitamins, and minerals as people seek to boost their immune systems and overall wellness. Among these, black garlic has gained popularity for its unique flavor and perceived health benefits. This research explores the feasibility of entering the Myanmar market with black garlic supplements through a strategic partnership with City Mart Holdings Limited (CMHL), Myanmar's largest retail conglomerate.The study aims to assess market demand, regulatory requirements, and CMHL's distribution network to develop an effective market entry strategy. Key objectives include evaluating consumer interest, understanding regulatory hurdles, and leveraging CMHL's extensive distribution …
The Impact Of Foreign Direct Investment On Employment In The Asean Region, Kaichen Tang
The Impact Of Foreign Direct Investment On Employment In The Asean Region, Kaichen Tang
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the impact of foreign direct investment (FDI) inflows on employment levels in ASEAN countries from 1992 to 2022. Utilizing descriptive statistics, correlation matrices, and econometric models including the pooled ordinary least squares, fixed effects and random effects models, the findings indicate that FDI inflows generally have a positive and significant effect on employment. However, this impact varies across countries, with some experiencing positive effects while others face negative impacts. The study also controls for economic growth, inflation, trade openness, education levels, and political stability. The results highlight the necessity for policymakers to consider country-specific conditions when developing …
Exploring Market Dynamic And Strategies For Food Supplement Industry In Thailand: A Case Study Of Black Garlic, Nan Su Wai
Chulalongkorn University Theses and Dissertations (Chula ETD)
The food supplement industry in Thailand has been experiencing rapid growth due to increasing health consciousness, an aging population, rising disposable incomes, and urbanization. Within this industry, black garlic has become one of the significant products in Thailand due to its enhanced nutrient profile compared to fresh garlic. The paper aims to provide a comprehensive understanding of the current market landscape, consumer preferences and trends, and to recommend strategic approaches for the development of the black garlic sector. This paper focuses on analyzing the macro and micro-environmental factors affecting the food supplement industry, specifying the black garlic market in Thailand. …
The Impact Of Inward Foreign Direct Investment (Fdi) On Total Factor Productivity Growth (Tfpg) In Asian Countries, Jiao Lu
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the impact of inward foreign direct investment (FDI) on total factor productivity (TFP) growth in 23 Asian countries from 1991 to 2018. Using a dynamic panel data model, this study analyzes how FDI, together with GDP growth, capital and labor inputs, human capital, export growth, internet usage, and distance to the technology frontier, affects total factor productivity (TFP) growth. The results indicate that, while FDI remains significant, its impact on total factor productivity (TFP) growth is negative.The negative impact may be caused by the lack of sufficient human capital and absorptive capacity in host countries, along with …
Development Of 3d Cell Culture Model For Graves’ Ophthalmopathy, Rajit Chompoowong
Development Of 3d Cell Culture Model For Graves’ Ophthalmopathy, Rajit Chompoowong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Orbital tissue fibrosis and remodeling contribute to the development of exophthalmos, a hallmark symptom of Graves’ ophthalmopathy (GO). The central pathogenesis to this process are orbital fibroblasts (GOF), which express autoantigen, thyroid-stimulating hormone receptor (TSHR). However, there are limitations in preclinical models for studying the pathogenesis and drug discovery of GO, which poses challenges for developing effective treatment options. This study aimed to identify markers of GOF, explore epigenetic alteration, and develop a scaffold-free 3D cell culture model for GO. The novel results from immunohistochemical analysis showed that vimentin was uniquely expressed in GO but absent in control samples. Additionally, …
Rapid Bacterial Pathogen Identification With Nanopore Sequencing In Clinical Urinary Tract Infection Setting, Panupong Wangprapa
Rapid Bacterial Pathogen Identification With Nanopore Sequencing In Clinical Urinary Tract Infection Setting, Panupong Wangprapa
Chulalongkorn University Theses and Dissertations (Chula ETD)
Urinary tract infections (UTIs) affect approximately two-thirds of women worldwide, posing a significant healthcare burden. Uncomplicated UTIs can escalate if not treated promptly. Inappropriate antibiotic use, driven by slow conventional diagnostics, contributes to the escalating crisis of antimicrobial resistance (AMR). A rapid, accurate, and affordable pathogen identification with integrated AMR profiling is essential for effective treatment and responsible antibiotic stewardship.Traditional UTI diagnosis relies on urine culture and antimicrobial susceptibility testing (AST), often requiring up to 96 hours and thus necessitating the empiric use of broad-spectrum antibiotics as a first-line of treatment. While faster options like dipsticks and Polymerase Chain Reaction …
Improving The Writing Ability Of Thai Efl Undergraduate Students By Employing Group Dynamic Assessment, Siyanee Sawetsiri
Improving The Writing Ability Of Thai Efl Undergraduate Students By Employing Group Dynamic Assessment, Siyanee Sawetsiri
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aimed to investigate the effect of the group dynamic assessment (G-DA) on students’ writing ability, to examine the extent to which students can maintain their improved writing ability in the transcendence test or the other assessment context, and to identify the types of mediation that were used for the development of students’ writing ability. In this study, the group dynamic assessment (G-DA) was implemented in the genre-based writing instruction for a total of 12 weeks. The participants were an intact group of 15 second-year students from the Faculty of Science, Mahidol University, Kanchanaburi Campus. The results of one-way …
Electrolyte/Electrode Interfacial Electrochemical Optimization Strategies For Durable Aqueous Zinc-Ion Batteries, Jingjing Niu
Electrolyte/Electrode Interfacial Electrochemical Optimization Strategies For Durable Aqueous Zinc-Ion Batteries, Jingjing Niu
Chulalongkorn University Theses and Dissertations (Chula ETD)
Aqueous zinc ion batteries, as a type of secondary battery using inorganic aqueous solution as the electrolyte, are considered to be a strong contender in the field of future energy storage technologies due to their high theoretical electric capacity, high safety, low cost and environmental friendliness. However, aqueous zinc ion batteries also face some challenges. The first is the relatively low energy density, which requires further optimisation of electrode materials and battery structure. Secondly, the creation of zinc dendrites can reduce the cycling stability and safety of the battery. In addition, prolonging the cycle life is also a pressing issue. …
Development Of Janus Membrane From Electrospun Nanofiber For Membrane Distillation Processes, Michaela Olisha Lobregas
Development Of Janus Membrane From Electrospun Nanofiber For Membrane Distillation Processes, Michaela Olisha Lobregas
Chulalongkorn University Theses and Dissertations (Chula ETD)
The Janus membrane, characterized by surfaces with opposite wettability, represents an innovative design for membrane distillation (MD). This study introduces new methods for fabricating MD membranes with tailored surfaces to address fouling and wetting challenges in saline systems. A nanofibrous Janus membrane was developed, featuring an omniphobic substrate as the non-wetting layer and a hydrophilic top coating as the wetting layer. Using the dual-spinneret system for simultaneous electrospinning and electrospraying, a composite substrate membrane, comprising a loose network of PVDF nanofibers and PVDF-fluorinated TiO2 microclusters, was produced. This membrane exhibited high resistance to liquids, including water, glycerol, diiodomethane, and saline. …
Investigating The Language Challenges And Pedagogical Reasoning Of Thai Medical Teachers In English-Medium Instruction (Emi) Classrooms, Teaka Sowaprux
Investigating The Language Challenges And Pedagogical Reasoning Of Thai Medical Teachers In English-Medium Instruction (Emi) Classrooms, Teaka Sowaprux
Chulalongkorn University Theses and Dissertations (Chula ETD)
This dissertation investigates the language challenges faced by English-medium instruction (EMI) medical teachers in multilingual classrooms and examines how their pedagogical reasoning influences the use of classroom language to convey complex medical content. As EMI continues to expand globally, particularly in higher education, content teachers initially hired to teach in their home language are increasingly being recruited to teach academic subjects through English. While existing research has explored language challenges in EMI science classrooms (Gustafsson, 2020; Pun, Fu, & Cheung, 2023), there is limited understanding of how medical teachers adapt their teaching strategies in response to these challenges. This study …
Air Flow Behavior Assessment In Particulate Filtration Efficiency (Pfe) Tester Via Computational Fluid Dynamics (Cfd), Muhammad Amer
Air Flow Behavior Assessment In Particulate Filtration Efficiency (Pfe) Tester Via Computational Fluid Dynamics (Cfd), Muhammad Amer
Chulalongkorn University Theses and Dissertations (Chula ETD)
Particulate Filtration Efficiency (PFE) assessment is critical for evaluating filter media. There are several PFE testing protocol depending on products and issuing countries, for example ASTM-F2299 standard for disposable medical masks, NIOSH-TEB-APR-STP-0059 for N and R series respirators, and ISO-29463 for HEPA filters. While the PFE testing principles of all standard are the same, their requirement, testing protocol and minute details are different. Air flow characteristic before and after filter media in testing chamber is very important to accuracy of PFE measurement, especially for ASTM F2299 standard. We have developed a custom PFE tester per ASTM F2299 using a simple …
The Integration Of Chinese Cuisine In Contemporary Thai Society As Reflected In The Names Of Food: A Case Study Of Salapao, Yating Shen
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis aims to study the integration of Chinese cuisine in contemporary Thai society as reflected in the names of food by using the Chinese steamed bun or salapao as a case study. Objectives of the thesis include 1) to analyze the form and meaning of the names of salapao consumed in Thai society and 2) to examine the integration of salapao in contemporary Thai society as reflected in its names. 200 names of salapao with savory and sweet fillings consumed in Thailand between 2022 and 2024 are collected from the products of salapao brands in Bangkok and 24 provinces. …