Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Chulalongkorn University

Discipline
Keyword
Publication Year
Publication
Publication Type

Articles 601 - 630 of 17317

Full-Text Articles in Entire DC Network

ประมวลศัพท์เรื่องกาแฟพิเศษ, จิรัฏฐ์ สำราญสุข Jan 2025

ประมวลศัพท์เรื่องกาแฟพิเศษ, จิรัฏฐ์ สำราญสุข

Chulalongkorn University Theses and Dissertations (Chula ETD)

สารนิพนธ์ฉบับนี้มีวัตถุประสงค์เพื่อจัดทำประมวลศัพท์เรื่องกาแฟพิเศษ โดยรวบรวมคำศัพท์ที่เกี่ยวข้องกับกระบวนการแปรรูปกาแฟ การคั่วกาแฟ การบดกาแฟ การชงกาแฟ ตลอดจนการประเมินคุณภาพกาแฟ จุดมุ่งหมายหลักคือเพื่อศึกษาทฤษฎีทางศัพทวิทยาที่เกี่ยวข้อง รวมถึงระเบียบวิธีและกระบวนการจัดทำประมวลศัพท์ พร้อมทั้งจัดทำประมวลศัพท์เรื่องกาแฟพิเศษอย่างเป็นระบบ เพื่อให้ผู้ที่เกี่ยวข้องในศาสตร์กาแฟพิเศษ รวมถึงผู้ที่ทำงานด้านกาแฟ นักแปล ล่าม และผู้สนใจสามารถนำประมวลศัพท์นี้ไปใช้เพื่อการอ้างอิงได้ในการจัดทำประมวลศัพท์นี้ อาศัยการศึกษาและนำทฤษฎีทางศัพทวิทยาและแนวทางการจัดทำประมวลศัพท์ของนักศัพทวิทยาหลายท่านมาปรับใช้ โดยกระบวนการทำงานแบ่งออกเป็น 5 ขั้นตอนสำคัญ ได้แก่ (1) การกำหนดหัวข้อ ขอบเขตของการวิจัย กลุ่มเป้าหมาย และวัตถุประสงค์ในการจัดทำประมวลศัพท์ (2) การศึกษาทฤษฎีและระเบียบวิธีในการจัดทำประมวลศัพท์ (3) การรวบรวมและศึกษาข้อมูลเกี่ยวกับกาแฟพิเศษเพื่อนำมาจัดทำคลังข้อมูลภาษาและคัดศัพท์จากคลังข้อมูลภาษา (4) การกำหนดมโนทัศน์สัมพันธ์ระหว่างศัพท์ที่คัดเลือก และ (5) การจัดทำบันทึกข้อมูลศัพท์เบื้องต้นและบันทึกข้อมูลศัพท์เพื่อนำเสนอศัพท์เทียบเคียงในภาษาไทยผลลัพธ์ของงานวิจัยนี้คือ ประมวลศัพท์เรื่องกาแฟพิเศษซึ่งประกอบด้วยศัพท์ทั้งหมด 37 คำ โดยนำเสนอเป็นกลุ่มมโนทัศน์สัมพันธ์และลำดับของมโนทัศน์สัมพันธ์ โดยการนำเสนอแต่ละศัพท์ประกอบด้วยศัพท์ภาษาอังกฤษ ศัพท์เทียบเคียงในภาษาไทย คำนิยาม ประเภททางไวยากรณ์ หมวดหมู่ บริบทอ้างอิงที่พบศัพท์ดังกล่าว มโนทัศน์สัมพันธ์พร้อมประเภทของความสัมพันธ์ รูปทางภาษาอื่นของศัพท์และข้อมูลอ้างอิง เพื่อให้เห็นลักษณะและความสัมพันธ์ ตลอดจนรูปแบบการใช้ของศัพท์ดังกล่าวอย่างชัดเจน อันเป็นประโยชน์ต่อการใช้ศัพท์เฉพาะในเชิงวิชาการและการสื่อสารในแวดวงได้อย่างถูกต้อง

Go to article

การวิเคราะห์ทางเลือกที่เหมาะสมที่สุดในการใช้ประโยชน์ขาแท่นผลิตปิโตรเลียมในอ่าวไทย ที่สิ้นสุดการใช้งาน โดยใช้แนวคิดมูลค่าทางเศรษฐศาสตร์โดยรวมด้วยกระบวนการวิเคราะห์ตามลำดับชั้น, อธิษฐาน เอมะรุจิ Jan 2025

การวิเคราะห์ทางเลือกที่เหมาะสมที่สุดในการใช้ประโยชน์ขาแท่นผลิตปิโตรเลียมในอ่าวไทย ที่สิ้นสุดการใช้งาน โดยใช้แนวคิดมูลค่าทางเศรษฐศาสตร์โดยรวมด้วยกระบวนการวิเคราะห์ตามลำดับชั้น, อธิษฐาน เอมะรุจิ

Chulalongkorn University Theses and Dissertations (Chula ETD)

การวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาถึงกระบวนการในการพิจารณาทางเลือกที่เหมาะสมที่สุด (Best Practical Environmental Option; BPEO) ในการรื้อถอนและใช้ประโยชน์ขาแท่นผลิตปิโตรเลียมในอ่าวไทยที่สิ้นสุดการใช้งานและการประยุกต์ใช้กระบวนการวิเคราะห์ตามลำดับชั้น (Analytic Hierarchy Process: AHP) เป็นเครื่องมือในการวิเคราะห์และสนับสนุนการตัดสินใจอย่างเป็นระบบ เพื่อเสนอแนะแนวทางในการเสริมกระบวนการ BPEO ให้ครอบคลุมปัจจัยด้านมูลค่าทางเศรษฐศาสตร์โดยรวม (Total Economic Value: TEV) และผลประโยชน์ชาติทางทะเล การศึกษาใช้การวิจัยเชิงการตัดสินใจแบบหลายเกณฑ์ (Multi-Criteria Decision Analysis: MCDA) โดยใช้กระบวนการ AHP เป็นเครื่องมือในการวิเคราะห์และสนับสนุนการตัดสินใจ และได้นำแนวคิด TEV มาใช้เป็นกรอบแนวคิดในการกำหนดปัจจัยการพิจารณาในเชิงคุณค่าและบทบาทของขาแท่น โดยไม่มุ่งเน้นการประเมินมูลค่าออกมาเป็นตัวเงิน งานวิจัยมุ่งศึกษาเฉพาะโครงสร้างขาแท่นส่วนใต้น้ำ ซึ่งได้พัฒนาเป็นระบบนิเวศใหม่ (novel ecosystems) ที่มีความอุดมสมบูรณ์ การวิจัยดำเนินการทั้งเชิงปริมาณและเชิงคุณภาพ โดยเก็บรวบรวมข้อมูลจากแบบสอบถามออนไลน์จากกลุ่มตัวอย่างจำนวน 92 คน ประกอบด้วยกลุ่มผู้เชี่ยวชาญที่ให้คำปรึกษาในการรื้อถอนโดยตรง และกลุ่มผู้มีส่วนได้ส่วนเสียจากหน่วยงานที่เกี่ยวข้องและประชาชนที่ให้ความสนใจ ผลการศึกษาพบว่า ทั้งผู้เชี่ยวชาญและผู้มีส่วนได้ส่วนเสียให้ความสำคัญต่อบทบาททางนิเวศอย่างมีนัยสำคัญ ส่งผลให้ทางเลือก “การคงขาแท่นไว้เป็นปะการังเทียม ณ ที่เดิม” ได้รับการจัดอันดับความเหมาะสมสูงสุด สะท้อนให้เห็นการให้ความสำคัญกับคุณค่าทางนิเวศและผลประโยชน์ระยะยาวของขาแท่นในบริบทของทรัพยากรทางทะเลและการขับเคลื่อนเศรษฐกิจสีน้ำเงิน ซึ่งแตกต่างจากแนวปฏิบัติของกระบวนการ BPEO ในปัจจุบัน ที่โดยทั่วไปยังคงมุ่งเน้นการรื้อถอนโครงสร้างทั้งหมดขึ้นฝั่ง นอกจากนี้ยังพบว่าความคิดเห็นจำนวนมากสะท้อนข้อกังวลเกี่ยวกับความไม่ชัดเจนของกรอบกฎหมาย บทบาทและความรับผิดชอบในระยะยาว รวมถึงการขาดกลไกกำกับดูแลที่เป็นระบบ ซึ่งเป็นอุปสรรคสำคัญต่อการพิจารณาทางเลือกที่หลากหลาย งานวิจัยนี้จึงมีข้อเสนอแนะเชิงนโยบาย ได้แก่ การเสนอให้นำ AHP มาประยุกต์ใช้เป็นเครื่องมือเพื่อเสริมประสิทธิภาพการตัดสินใจ ในกระบวนการ BPEO และบูรณาการปัจจัยด้าน TEV ในการพิจารณา BPEO เพื่อให้มีครอบคลุมปัจจัยครบทุกมิติโดยเฉพาะบทบาทเชิงนิเวศของขาแท่น รวมทั้งปรับปรุงกฎหมายและกฎระเบียบที่เกี่ยวข้องให้รองรับการใช้ประโยชน์ ขาแท่นในทะเลในระยะยาว ส่งเสริมการวิจัยเพื่อใช้เป็นฐานข้อมูลเชิงประจักษ์ และบูรณาการการมีส่วนร่วมในทุกขั้นตอนเพื่อยกระดับการบริหารจัดการขาแท่นผลิตปิโตรเลียมที่สิ้นสุดการใช้งานอย่างยั่งยืน

Go to article

Association Of Out-Of-Pocket Expenditures With Continuation And Type Of Treatment Among New Adult Cancer Cases At Ahsania Mission Cancer And General Hospital In Bangladesh (2023-2024) : A Secondary Data Analysis, A K M Shahriar Jan 2025

Association Of Out-Of-Pocket Expenditures With Continuation And Type Of Treatment Among New Adult Cancer Cases At Ahsania Mission Cancer And General Hospital In Bangladesh (2023-2024) : A Secondary Data Analysis, A K M Shahriar

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background and Objective: Bangladesh faces a heavy cancer burden, with about 167,000 new cases annually and 68% of health spending paid out-of-pocket (OOP). High OOP costs cause financial toxicity, forcing patients to abandon treatment. This study examined associations between patient OOP expenditures and prescribed treatment continuation and treatment modality (others versus chemotherapy/radiotherapy) among adult cancer patients at a hospital in Dhaka. Methodology: We conducted a cross-sectional analysis of existing hospital records for all adult cancer patients (age ≥18) at Ahsania Mission Cancer and General Hospital between 01 January 2023 and 31 December 2024 (N = 12,907). Data included each patient’s …

Go to article

Association Of Biomarker And Cardiovascular-Kidney-Metabolic Syndrome Among Older Chinese Adults : Findings From A Nationwide Study, Jiahao Shi Jan 2025

Association Of Biomarker And Cardiovascular-Kidney-Metabolic Syndrome Among Older Chinese Adults : Findings From A Nationwide Study, Jiahao Shi

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: CKM syndrome poses a growing burden in aging populations, but early detection remains limited by the lack of integrated biomarkers. The C-reactive protein–triglyceride glucose index (CTI), which reflects inflammation and insulin resistance—two core drivers of CKM—has not yet been evaluated for its association with CKM status in large, aging Asian cohorts. This study addresses this gap.Objective: To investigate the association of C-reactive protein–triglyceride–glucose (CTI) index with cardiovascular-kidney-metabolic (CKM) syndrome in older Chinese adults.Methods: This cross-sectional study analyzed data from 10,318 participants aged ≥45 years in the 2015 China Health and Retirement Longitudinal Study (CHARLS). CKM syndrome was operationalized as …

Go to article

Exploration Of The Mechanisms Of Benjakul’S Anti-Rheumatoid Arthritis Actions Through Network Pharmacology, Hongxiang Duan Jan 2025

Exploration Of The Mechanisms Of Benjakul’S Anti-Rheumatoid Arthritis Actions Through Network Pharmacology, Hongxiang Duan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Rheumatoid arthritis (RA) is driven by chronic inflammation and matrix degradation; traditional Thai formula Benjakul (BJK) is empirically used for inflammatory conditions, but its mechanisms are not well defined. To assess the antioxidant capacity of BJK and to elucidate potential anti-inflammatory targets and signaling pathways relevant to RA. BJK and its five constituent herbs were extracted with 99% ethanol and evaluated for TPC, TFC, FRAP, and DPPH assays. LC–MS/MS was used to profile key bioactive compounds, which were further filtered by SwissADME and subjected to target prediction using SwissTargetPrediction. Overlapping targets with RA-related genes were analyzed by GO and KEGG. …

Go to article

"Factors Associated With Knowledge, Attitude And Practice (Kap) Towards The Prevention Of Type 2 Diabetes Mellitus Among The Middle-Aged Group Adults In Dhaka City, Bangladesh : A Cross-Sectional Study", Sabrina Rahman Jan 2025

"Factors Associated With Knowledge, Attitude And Practice (Kap) Towards The Prevention Of Type 2 Diabetes Mellitus Among The Middle-Aged Group Adults In Dhaka City, Bangladesh : A Cross-Sectional Study", Sabrina Rahman

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Type 2 Diabetes Mellitus has emerged as a critical public health challenge in Bangladesh, particularly in urban areas, like Dhaka city, due to rapid urbanization, sedentary lifestyles, dietary transitions, and increasing obesity rates. However, there is limited research related to influencing factors of knowledge, attitude, and practice towards diabetes prevention in Bangladesh. Objective: This study aims to identify the level of knowledge, attitude, and practices (KAP) towards the prevention of Type 2 Diabetes Mellitus and their associated factors among middle-aged adults in Dhaka City, Bangladesh. Methods: A cross-sectional study design was conducted in participants aged 30–64 years, with a …

Go to article

Association Between Knowledge, Attitude, Risk Perception, Expectancies And Cannabis Use Among International University Students In Thailand : A Cross-Sectional Study, Yueting Liu Jan 2025

Association Between Knowledge, Attitude, Risk Perception, Expectancies And Cannabis Use Among International University Students In Thailand : A Cross-Sectional Study, Yueting Liu

Chulalongkorn University Theses and Dissertations (Chula ETD)

The global increase in cannabis use, particularly among young individuals, poses a serious public health risk. Thailand decriminalized cannabis in 2022, under this situation, international students are experiencing changes in social attitudes toward cannabis use and have increasing access to sources of cannabis. There is currently lack of research on cannabis use among this group in Thailand. This study aimed to analyze the associations between knowledge, attitudes, risk perceptions, and expectancies and cannabis use among international university students in Thailand. This cross-sectional study was conducted among international university students aged 18 years and older in Thailand. Participants were collected through …

Go to article

Nat Kunn And Nat Nann: Changes Of “Body Techniques” And Domestic Spaces Within The Spiritual Cult Of Myanmar, Aung Khant Jan 2025

Nat Kunn And Nat Nann: Changes Of “Body Techniques” And Domestic Spaces Within The Spiritual Cult Of Myanmar, Aung Khant

Chulalongkorn University Theses and Dissertations (Chula ETD)

The British colonization of Burma in 1885 marked a turning point in Myanmar’s traditional society, particularly in changes of body techniques, shikho (prostration), and the practice of wearing or removing shoes in sacred spaces. While recent scholars have examined the changes in body techniques and spiritual cult, the relationship between body techniques and domestic spaces has remained underexplored. Tracing the changes in techniques from Colonial Burma to contemporary Myanmar, this thesis explores the relationship between body techniques and domestic spaces, Nat Kunn, small shrines dedicated to specific Nats, deities, and Nat Nann, which are larger shrines for the Nat Pantheon. …

Go to article

Potted Plants In Urban Spaces: Analyzing Social And Spatial Dynamics For Urban Management In Bangkok's Residential Areas, Chihiro Okajima Jan 2025

Potted Plants In Urban Spaces: Analyzing Social And Spatial Dynamics For Urban Management In Bangkok's Residential Areas, Chihiro Okajima

Chulalongkorn University Theses and Dissertations (Chula ETD)

Potted plants have long served as portable, small-scale gardens for residents in Thailand, particularly in densely populated and flood-prone areas. In Bangkok, they remain a common feature of the urban landscape, reflecting both everyday life and traditional Thai culture. Beyond their cultural and visual value, these potted plants are increasingly recognized as a practical form of green infrastructure, especially in high-density urban areas where space is limited. However, current rigid regulatory frameworks—which distinguish strictly between public and private spaces—prioritize keeping sidewalks clear, creating tension between city and residents as most potted plants are placed on public land beyond private property …

Go to article

The Works Of Hassan Roland Vogel As Tropical Modern Architecture In Southeast Asia, 1960s-1980s, Li Hung Chang Jan 2025

The Works Of Hassan Roland Vogel As Tropical Modern Architecture In Southeast Asia, 1960s-1980s, Li Hung Chang

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research explores the architectural contributions of Swiss architect Hassan Roland Vogel (1932–1987), focusing on his interpretation of Tropical Modernism within the cultural and urban contexts of Southeast Asia from the 1960s to the 1980s. As a lesser-known yet significant figure in regional modernism, Vogel co-founded INTAREN Architect and Engineer Company Limited in Bangkok with Jean Albert Penneçot, producing a body of work that balanced Swiss precision with tropical adaptability. His projects, ranging from corporate towers to diplomatic buildings, demonstrate how modernist ideals were reinterpreted through climate, material, and local culture.The study examines key works such as the Esso Building …

Go to article

Analysing Biophilic And Technophilic Design In Architectural Materiality: A Comparative Study Of Bangkok's Community Malls, Thailand, Min Si Hein Jan 2025

Analysing Biophilic And Technophilic Design In Architectural Materiality: A Comparative Study Of Bangkok's Community Malls, Thailand, Min Si Hein

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study examines how architectural materiality and perceptual attributes influence human sensory and emotional experience through the theoretical frameworks of biophilia and technophilia. Focusing on two community malls in Bangkok—The Commons Thong Lo and Zone C of Marché Thong Lo—the research adopts a qualitative comparative case study approach, combining on-site observation, photographic documentation, and semi-structured interviews. The study applies an attribute-based analytical framework that categorizes architectural experience into six dimensions: material origin, sensory qualities, user interaction, visual comfort, spatial atmosphere, and emotional response. The findings reveal that The Commons Thong Lo expresses a predominantly biophilic orientation, characterized by natural materials, …

Go to article

The Effect Of Economic And Climate Policy Uncertainties On Momentum Strategies Across Different Esg Levels, Siwaphat Prommana Jan 2025

The Effect Of Economic And Climate Policy Uncertainties On Momentum Strategies Across Different Esg Levels, Siwaphat Prommana

Chulalongkorn University Theses and Dissertations (Chula ETD)

This thesis investigates the impact of Economic Policy Uncertainty (EPU) and Climate Policy Uncertainty (CPU) on ESG momentum strategies in U.S. equity markets from 2011 to 2023. Momentum portfolios are constructed within high- and low-rated ESG pillar groups to assess how policy uncertainty influences their performance across different firm characteristics, including sectoral classification and geographic operations. Empirical analysis reveals that policy uncertainty, particularly through Forecast and News channels, significantly affects momentum returns, with the strongest effects concentrated among low ESG-rated and domestically focused firms. Cyclical sectors display heightened sensitivity to both EPU and CPU, while international firms show weaker or …

Go to article

A Comparative Study Of Econometric And Deep Learning Models For Forecasting Exchange-Traded Fund Prices In The Thai Market, Witchayut Likhitrattanakon Jan 2025

A Comparative Study Of Econometric And Deep Learning Models For Forecasting Exchange-Traded Fund Prices In The Thai Market, Witchayut Likhitrattanakon

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study evaluates and compares the forecasting accuracy of ten Exchange-Traded Funds (ETFs) in the Thai market using comprehensive econometric and deep learning models, with Mean Absolute Error (MAE) as the primary performance metric. The research examines DCC-GARCH, CCC-GARCH, standard GARCH-type models and Long Short-Term Memory (LSTM) networks across both raw and processed data environments (from isolation forest and random forest). In the comprehensive model comparison, Univariate LSTM with Real Price input (30 lookback period) achieved the lowest MAE for eight of ten ETFs in raw data and seven of ten in processed data, establishing it as the most effective …

Go to article

Efficacy Of 0.3% Cannabidiol (Cbd) Oral Paste For Treatment Of Recurrent Aphthous Ulcers, Fuengboon Talkijkul Jan 2025

Efficacy Of 0.3% Cannabidiol (Cbd) Oral Paste For Treatment Of Recurrent Aphthous Ulcers, Fuengboon Talkijkul

Chulalongkorn University Theses and Dissertations (Chula ETD)

0.1% Cannabidiol (CBD) was reported to be suitable as an alternative management for Recurrent Aphthous Ulcers (RAU) due to its analgesics and anti-inflammatory effects. This study aimed to examine 0.3 % CBD when compared to 0.1% CBD, 0.1% Triamcinolone Acetonide (TA) oral paste and pure oral paste in the treatment of RAU. For safety investigations, 100 healthy subjects were examined for allergic reaction to 0.3% CBD oral paste compared to pure oral paste, then 50 healthy subjects were evaluated for local and systemic effects of 0.3% CBD oral paste in which blood tests were performed before drug application and seven …

Go to article

Stress And Burnout Level Among Bhutanese Dentists And Medical Officers In Bhutan, Karma Zangmo Jan 2025

Stress And Burnout Level Among Bhutanese Dentists And Medical Officers In Bhutan, Karma Zangmo

Chulalongkorn University Theses and Dissertations (Chula ETD)

Healthcare professionals, particularly dentists and physicians, are at high risk of stress and burnout due to long working hours, heavy workloads, clinical decision-making responsibilities, and the need for continuous knowledge updates. This study aimed to assess stress and burnout levels among Bhutanese dentists and physicians. A cross-sectional survey was conducted using online questionnaires distributed to 85 dentists and 325 physicians, with response rates of 87.7% and 52.6%, respectively. Stress was measured using the 14-item Perceived Stress Scale (PSS), and burnout was assessed with the 22-item Maslach Burnout Inventory (MBI). Among dentists, 97.8% reported stress, with 91.8% at moderate levels. Among …

Go to article

Effect Of Characteristics Of Titanium Dental Implant And Patient Related Factors On Implant Stability: 2-Year Retrospective Follow-Up Study, Kyaw Zin Thein Jan 2025

Effect Of Characteristics Of Titanium Dental Implant And Patient Related Factors On Implant Stability: 2-Year Retrospective Follow-Up Study, Kyaw Zin Thein

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Dental implants offer improvements in oral function and aesthetics for edentulous patients. Thai dental implants have emerged as a cost-effective alternative product. Objective: This study aimed to evaluate factors that influence the success of PRK dental implants over a two-year follow-up period. Methods: This retrospective study included patient records of at least one unit of PRK implant-supported prosthesis with a minimum of two-year of follow-up between 2020 and 2025 at the Dental Innovation Foundation under Royal Patronage, Thailand. Data was extracted on demographics, oral habits, medical history, and periodontal parameters (plaque index, pocket depth, keratinized gingiva width, and gingival …

Go to article

Influence Of Shade On Color Reproducibility Of Lithium Disilicate Crowns, Naphat Santiworanart Jan 2025

Influence Of Shade On Color Reproducibility Of Lithium Disilicate Crowns, Naphat Santiworanart

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objective: This study aimed to evaluate the influence of nominal shade on the color reproducibility of CAD-CAM lithium disilicate glass ceramic crowns.Materials and Methods: An in vitro study was conducted on 16 CAD-CAM lithium disilicate crowns (IPS e.max CAD LT) fabricated in four VITA Classical shades (A3, B3, C3, D3; N=4 per group). Each crown was cemented on a corresponding polymethylmethacrylate (PMMA) abutment of matching shade. Shade determination was performed using a spectrophotometer and an intraoral scanner under controlled conditions. Color trueness was assessed against the VITA Classical shade guide using exact match and broad acceptance criteria. The L*, a*, …

Go to article

Effect Of Printing Orientation And Surface Treatment On The Surface Roughness, Shear Bond Strength, And Flexural Strength Of 3d-Printed Provisional Materials, Kornrawee Wiroonsri Jan 2025

Effect Of Printing Orientation And Surface Treatment On The Surface Roughness, Shear Bond Strength, And Flexural Strength Of 3d-Printed Provisional Materials, Kornrawee Wiroonsri

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to evaluate the influence of printing orientation and surface treatment on the surface roughness, shear bond strength (SBS), and flexural strength of three-dimensional (3D)-printed provisional resin materials. Four printing orientations (0°, 45°, 60°, and 90°) and four surface treatments (no treatment, airborne particle abrasion (APA), tetrahydrofuran (THF), and HC primer) were investigated. A total of 320 specimens were fabricated, post-processed, and tested according to ISO standards. Among these, 240 disk-shaped specimens were utilized for surface roughness assessment, conducted using a non-contact profilometer, and for SBS evaluation through a notched-edge shear test. Additionally, 80 rectangular bar specimens were …

Go to article

Physico-Mechanical And Antibacterial Properties Of Resin-Based Dental Sealants Modified With Graphene Oxide Nanoparticles, Ploypim Kraisintu Jan 2025

Physico-Mechanical And Antibacterial Properties Of Resin-Based Dental Sealants Modified With Graphene Oxide Nanoparticles, Ploypim Kraisintu

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objectives: This study evaluated the effects of incorporating graphene oxide (GO) nanoparticles at different concentrations (0.1, 0.25, and 0.5 wt%) into resin-based pit and fissure sealants. Mechanical, physical, antibacterial, and cytotoxicity were tested and compared with a commercial reference material.Materials and Methods: An experimental resin-based sealant was formulated and reinforced with GO (G2–G4), while an unmodified resin served as control (G1) and Helioseal® F Plus as commercial comparison (G5). GO morphology was characterized by TEM. Specimens (n=240) were tested for Vickers microhardness, viscosity, surface roughness (DRa) after simulated toothbrushing, and fluorescence (% blue channel). Antibacterial activity against Streptococcus mutans was …

Go to article

Occlusal Analysis Using A Novel Classification Of Static And Dynamic Articulations In Tmd And Non-Tmd Patients, Uthai Uma Jan 2025

Occlusal Analysis Using A Novel Classification Of Static And Dynamic Articulations In Tmd And Non-Tmd Patients, Uthai Uma

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Temporomandibular disorders (TMD) are multifactorial conditions affecting masticatory systems. While occlusal morphology has been suggested as a contributing factor, functional, behavioral, and postural elements may play a more prominent role. This study aimed to evaluate demographic, clinical, occlusal, and functional characteristics associated with TMD in a Thai patient population using a novel articulation classification. Methods: A retrospective analysis of 872 participants (684 TMD, 188 non-TMD) was conducted. Data included demographic characteristics, postural and habitual behaviors, occlusal morphology, articulation classification, articulation ratios, mandibular range of motion, and TMD diagnostic categories. The articulation classification and ratios were designed and tested for …

Go to article

Wage Gap And Wage Discrimination Among Persons With Disabilities: Empirical Evidence From Thailand, Natthavit Wongsrithanasarn Jan 2025

Wage Gap And Wage Discrimination Among Persons With Disabilities: Empirical Evidence From Thailand, Natthavit Wongsrithanasarn

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study provides a comprehensive quantitative analysis of the disability wage gap and potential wage discrimination in Thailand. Utilizing data from the 2017 and 2022 Thailand Disability Surveys, this research employs the Oaxaca-Blinder decomposition technique to examine wage disparities between workers with and without physical or cognitive disabilities. The results reveal a substantial wage gap, with non-disabled workers, on average, earning approximately 50% more than persons with physical disabilities and more than twice as much as persons with cognitive disabilities. The decomposition analysis indicates that while over 75% of the wage gap for persons with physical disabilities is explained by …

Go to article

Guidelines For Designing Efl Textbooks To Promote Critical Reading Using Out-Of-Class English Materials, Chudakarn Pakarasang Jan 2025

Guidelines For Designing Efl Textbooks To Promote Critical Reading Using Out-Of-Class English Materials, Chudakarn Pakarasang

Chulalongkorn University Theses and Dissertations (Chula ETD)

The purposes of this mixed methods study were to 1) examine the extent to which critical reading instruction is embedded in Thai upper-secondary classrooms, and 2) propose guidelines for designing EFL textbooks to promote critical reading using out-of-class English materials for upper-secondary students. Data were collected through a questionnaire, classroom observations, and follow-up interviews. The research instruments consisted of 1) Teacher’s Critical Reading Teaching Practice Questionnaire, 2) observation field notes, and 3) semi-structured interview questions. The participants in the first phase were 91 English teachers in Bangkok, selected through purposive and convenience sampling. From this group, four model teachers were …

Go to article

Academic Management Strategies For Public Universities In Henan Province, People’S Republic Of China To Enhance The Digital Literacy, Jiepei Jin Jan 2025

Academic Management Strategies For Public Universities In Henan Province, People’S Republic Of China To Enhance The Digital Literacy, Jiepei Jin

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research aimed to 1) study the conceptual framework of public university academic management and the digital literacy. 2) analyze strengths, weaknesses, opportunities, and threats of academic management of public universities in Henan province, China to enhance the digital literacy. 3) develop academic management strategies for public universities in Henan province, China to enhance the digital literacy. A multi-phase mixed methods research design was employed integrating both quantitative and qualitative approaches. The sample consisted of 38 universities in Henan Province, People’s Republic of China. The informants were university administrators and faculty members. The instruments used for data collection included questionnaire, …

Go to article

Academic Management Strategies Of Private High Schools In Zhejiang, China Based On The Concept Of Digital Entrepreneurship, Jingmei Ma Jan 2025

Academic Management Strategies Of Private High Schools In Zhejiang, China Based On The Concept Of Digital Entrepreneurship, Jingmei Ma

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to achieve three research objectives: 1) To study the conceptual frameworks of academic management of private high schools and digital entrepreneurship competencies; 2) To identify the strengths, weaknesses, opportunities, and threats (SWOT) of academic management in Zhejiang private high schools based on the concept of digital entrepreneurship; 3) To develop academic management strategies for Zhejiang private high schools to enhance students’ digital entrepreneurship competencies. A multiphase mixed-methods research design was adopted, integrating quantitative and qualitative approaches. The informants included teachers and administrators from private high schools in Zhejiang Province, with a total of 627 respondents. Research instruments …

Go to article

Effect Of Solvent On Nonanoic And Azelaic Acids Yield Enhancement From Oxidative Cleavage Of Oleic Acid, Chakreeya Santhadklang Jan 2025

Effect Of Solvent On Nonanoic And Azelaic Acids Yield Enhancement From Oxidative Cleavage Of Oleic Acid, Chakreeya Santhadklang

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study investigates the effect of solvent choice on the oxidative cleavage of oleic acid using hydrogen peroxide (H2O2) as the oxidant, with a focus on improving the yields of nonanoic acid (NA) and azelaic acid (AA). Solvent selection was found to play a critical role due to polarity differences between the reactants and oxidants. tert-Butanol was unsuitable because of its low boiling point, leading to the evaluation of higher-boiling solvents including guaiacol, acetoin, ethyl lactate, and isobutyric acid. Guaiacol and acetoin exhibited undesirable chemical reactivity, while ethyl lactate resulted in low yields due to hydrogen bonding with intermediate species. …

Go to article

Quality Of Life Prediction For Driving Route Planning System Using Image Recognition And Deep Learning, Intouch Prakaisak Jan 2025

Quality Of Life Prediction For Driving Route Planning System Using Image Recognition And Deep Learning, Intouch Prakaisak

Chulalongkorn University Theses and Dissertations (Chula ETD)

Assessing travel-related Quality of Life (QoL) is a significant challenge due to its reliance on subjective human perception, which is difficult to measure. Traditional studies are often constrained by the limited scope of costly, manual data collection. The significant contribution of this research is the introduction of a new framework that can analyze tourist perception on a large and systematic scale. The novelty of this work lies in the utilization of Google Street View (GSV) as a large-scale visual data source, coupled with the use of a sequence-based model to analyze travel routes, which allows for the simulation of the …

Go to article

Out-Of-Domain Tuberculosis Detection From Chest X-Ray Images Using Meta Learning With Soft Labels, Kanokphat Jinanarong Jan 2025

Out-Of-Domain Tuberculosis Detection From Chest X-Ray Images Using Meta Learning With Soft Labels, Kanokphat Jinanarong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Automated tuberculosis screening from chest x-ray images could greatly benefit regions with limited medical resources. However, currently available methods could not handle this problem well due to the difference in chest x-ray images in each region caused by the difference in machine and demographics, the possible noise in the available labels, and other reasons. We therefore propose a new machine learning algorithm that could detect tuberculosis with great accuracy on any other data sources by learning from completely different data sources. We used a model-agnostic meta-learning together with a soft label approach, utilizing the meta-gradient to dynamically adjust the soft …

Go to article

A Study On The Impact Of Superconducting Fault Current Limiteron Arc Flash Hazard In An Industrial System, Kittipong Anantanasap Jan 2025

A Study On The Impact Of Superconducting Fault Current Limiteron Arc Flash Hazard In An Industrial System, Kittipong Anantanasap

Chulalongkorn University Theses and Dissertations (Chula ETD)

The increasing integration of distributed generation raises short-circuit current levels, which lead to concerns about equipment overheating, insulation deterioration, and system stability issues. The Resistive Superconducting Fault Current Limiter (R-SCFCL) offers an effective solution by dynamically increasing circuit impedance during faults without affecting normal operation. However, its integration may alter the fault-clearing time of the protection system, which is crucial for arc-flash safety. This study evaluates the impact of R-SCFCL integration on arc-flash hazards in an industrial power system, utilizing DIgSILENT PowerFactory and calculations based on IEEE 1584. Results indicate that while the R-SCFCL effectively reduces arcing current, the incident …

Go to article

Evaluating Co2 Storage Criteria : Focusing On Thailand's Petroleum Basins For Carbon Storage, Paul Tivere Benjamin Jan 2025

Evaluating Co2 Storage Criteria : Focusing On Thailand's Petroleum Basins For Carbon Storage, Paul Tivere Benjamin

Chulalongkorn University Theses and Dissertations (Chula ETD)

Anthropogenic carbon dioxide (CO2) emissions from large point sources remain central to Thailand’s climate challenge, and geological carbon capture and storage (CCS) is now included in national mitigation plans. However, Thailand still lacks a transparent way to compare candidate saline aquifers and petroleum basins in terms of storage performance, containment, and socio-economic conditions, while allowing for uneven data quality. This thesis develops a Thailand-specific, two-stage framework that combines threshold-based screening with a multi-criteria ranking framework based on the Analytic Hierarchy Process (AHP) and Data Confidence Scores (DCS). Twenty-one criteria in three groups (capacity and injectivity, containment, and socio-economic constraints) were …

Go to article

Large Language Model-Based Framework For Mental Health Support Conversation In Thai, Radchaneeporn Changpun Jan 2025

Large Language Model-Based Framework For Mental Health Support Conversation In Thai, Radchaneeporn Changpun

Chulalongkorn University Theses and Dissertations (Chula ETD)

As mental health support needs continue to rise in Thailand, access to professional care remains constrained. LLM-based chatbots present a scalable alternative, though most current systems are limited to single-turn, solution-focused interactions. This thesis introduces a Large Language Model-Based Framework for Mental Health Support Conversations in Thai, organizing dialogues around five fundamental mental health counseling stages: rapport building, problem identification, goal setting, working, and termination. Drawing from Person-Centered Therapy (PCT) and Acceptance and Commitment Therapy (ACT). The framework was assessed against three single-agent baseline models using LLM-simulated users, with positive user reaction rates evaluated by LLMs. Results demonstrated a 79.01% …

Go to article

First Prev Next Last