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Impact Of The Gold-To-Platinum Price Ratio On Mutual Fund Flows In Thailand, Luxamee Choktarm
Impact Of The Gold-To-Platinum Price Ratio On Mutual Fund Flows In Thailand, Luxamee Choktarm
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study explores whether the gold-to-platinum price ratio can explain mutual fund flows in Thailand by focusing on two key indicators: the abnormal GP ratio (AGP) and the fund sensitivity to monthly changes in GP (β∆GP). These measures are used to assess whether investors perceive the GP ratio as a proxy for economic uncertainty. The analysis uses monthly data from January 2017 to December 2023, covering both active equity funds and corporate bond funds. The models include fund level characteristics such as size, expense ratio, age, past flows, and return volatility, along with macroeconomic variables including inflation, exchange rates, interest …
The Effect Of Financial Flexibility On The Leverage-Performance Relationship In The Set Market For The Pre-To-Post Covid-19 Situation, Akesuwat Sanjaingamworapat
The Effect Of Financial Flexibility On The Leverage-Performance Relationship In The Set Market For The Pre-To-Post Covid-19 Situation, Akesuwat Sanjaingamworapat
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the effect of financial flexibility on the relationship between leverage and firm performance across three distinct economic phases—pre-COVID-19, pandemic, and post-pandemic recovery—in the Thai stock market (SET). Using panel data from SET-listed firms between Q1’2018 and Q4’2023, The analysis employs the fixed-effects and random-effects regression models with interaction terms to capture the dynamic role of financial flexibility and economic context. The findings confirm that leverage exerts a significantly negative effect on firm performance, particularly during the pandemic period, as measured by return on equity (ROE) and return on assets (ROA). However, this adverse impact is found to …
How Integrity Culture Affects Trade Credit Availability, Sarocha Limchaisiri
How Integrity Culture Affects Trade Credit Availability, Sarocha Limchaisiri
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines whether corporate integrity culture plays a role in shaping firms’ access to trade credit. Focusing on a panel of U.S. publicly listed firms from 2002 to 2021, it employs a text-based proxy for integrity constructed from annual reports and uses pooled OLS regression with industry and year fixed effects. The goal is to understand how ethical culture, as a non-financial factor, influences trade credit availability beyond traditional financial metrics. While the measure used—accounts payable to COGS ratio—is commonly applied in the literature, it reflects both the willingness of suppliers to extend credit and the firm’s decision to …
The Magnet Effect Of Circuit Breakers And Its Interaction With Price Limit On Thai Stock Market, Arthinsha Shinvoranont
The Magnet Effect Of Circuit Breakers And Its Interaction With Price Limit On Thai Stock Market, Arthinsha Shinvoranont
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the magnet effect of circuit breakers and their interaction with daily price limits in the Thai stock market during the COVID-19 crisis. Using high-frequency intraday data from March 2020 and an AR(2)-GARCH(1,1) framework, the analysis examines whether returns and trading activity accelerate near circuit breaker thresholds and how firm characteristics influence this effect. Results reveal significant magnet effects at the individual stock level, especially among smaller firms, while evidence at the index level is weak. The study also finds that circuit breakers and price limits reinforce each other, amplifying price movements when both thresholds are approached. These …
The Impact Of Esg Performance On Equity Mispricing: Evidence From Asia-Pacific Markets, Visut Poochum
The Impact Of Esg Performance On Equity Mispricing: Evidence From Asia-Pacific Markets, Visut Poochum
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the relationship between ESG performance and equity mispricing in Asia-Pacific markets from 2010 to 2023, using the Rhodes-Kropf et al. (2005) decomposition method. The results show that stronger ESG performance is significantly associated with lower mispricing, particularly among undervalued firms, suggesting that ESG improves pricing efficiency by reducing information asymmetry. ESG performance has limited influence on overvalued firms, indicating its impact is more pronounced when valuations are suppressed. Further analysis reveals that the environmental, social, and governance pillars each independently contribute to mitigating mispricing, highlighting their distinct roles in enhancing pricing accuracy. ESG controversy does not significantly …
Arbitrage Opportunity On Set Index Futures With Multi-Regime Machine Learning Approaches, Supakrit Nititsopon
Arbitrage Opportunity On Set Index Futures With Multi-Regime Machine Learning Approaches, Supakrit Nititsopon
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates mispricing between SET50 Index Futures and the spot market through a multi-regime framework that integrates traditional asset pricing theory with machine learning. Using data from 2010-2023, K-means clustering identifies distinct market regimes, while XGBoost models regime behavior based on micro- and macroeconomic features. OLS regression shows that mispricing is primarily driven by microstructural factors, with macroeconomic variables contributing marginally in specific regimes. A regime-specific pairs trading strategy between SET50 futures and the TDEX ETF reveals persistent, regime-dependent arbitrage opportunities. Notably, one regime generates consistent net returns after transaction costs, although limited trade frequency raises robustness concerns. The …
Corporate Climate Risk And Cash Holdings, Parima Limwong
Corporate Climate Risk And Cash Holdings, Parima Limwong
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper studies how companies manage their cash when they face different types of climate risks. It uses data from public companies in the United States from 2002 to 2023. The study measures climate risks such as transition risk, physical risks, and regulatory risk by looking at climate related words in companies’ earnings calls and reports. It also uses a special index that shows how uncertain climate policy is, based on news articles. The results show that companies with high regulatory risk usually keep more cash because they expect extra costs from new rules. However, risks from natural disasters or …
The Impact Of Morningstar Rating On Mutual Fund Performance, Risk, And Flows Evidence In Thailand Equity Mutual Funds, Maythavee Leeruangsakul
The Impact Of Morningstar Rating On Mutual Fund Performance, Risk, And Flows Evidence In Thailand Equity Mutual Funds, Maythavee Leeruangsakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the role of Morningstar ratings in predicting mutual fund performance, persistence, and fund flows in the Thai mutual fund market. The research focuses on three main objectives. First, it examines the relationship between Morningstar ratings and performance metrics including net return, 1-factor alpha, 4-factor alpha, Sharpe ratio, and Sortino ratio and risk metrics, including maximum drawdown, standard deviation, and Value-at-Risk, using both matched-pair analysis and regression methods. Second, it explores the persistence of fund performance through quintile transition matrices, regression analysis of lagged 4-factor alpha, and the cross-product ratio. Third, it analyzes the relationship between Morningstar ratings …
The Impact Of Maturity Mismatch On Default Risk: Evidence From Thailand, Rujirat Tangjitsamarnmitr
The Impact Of Maturity Mismatch On Default Risk: Evidence From Thailand, Rujirat Tangjitsamarnmitr
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the impact of maturity mismatch on default risk among listed companies in the Stock Exchange of Thailand (SET) and the Market for Alternative Investment (mai) from 2011 to 2023. It also investigates the moderating roles of external and internal factors that affect the relationship between maturity mismatch and default risk. The study employs a naïve probability approach, a simplified version of the Merton model, to estimate default probability. The results show that maturity mismatch significantly increases the probability of default, meaning that firms that rely on short-term financing to fund long-term investments face a higher likelihood of …
Mispricing Of Set50 Index Futures Calendar Spreads: Evidence From The Thailand Futures Exchange, Lapat Nangsue
Mispricing Of Set50 Index Futures Calendar Spreads: Evidence From The Thailand Futures Exchange, Lapat Nangsue
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the mispricing of SET50 Index Futures calendar spreads on the Thailand Futures Exchange (TFEX), focusing on deviations from the cost-of-carry model. Using end-of-day data from 2019 to 2024, the study analyzes how mispricing evolves as contracts approach expiration. The findings reveal that mispricing intensifies during the rollover period—particularly within 10 trading days before maturity—suggesting increased cost and risk for investors. Open interest in deferred contracts is found to be significantly correlated with mispricing, while net positions by investor types do not show statistical significance. The study also examines the 6-month calendar spread, which demonstrates more pricing stability …
The Impact Of Board Gender Diversity On Corporate Financial Performance In Southeast Asia: The Moderating Role Of Internationalization, Phanuwat Jianwattananukul
The Impact Of Board Gender Diversity On Corporate Financial Performance In Southeast Asia: The Moderating Role Of Internationalization, Phanuwat Jianwattananukul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the impact of board gender diversity on corporate financial performance and investigates the moderating role of internationalization in the context of Southeast Asia. Using a panel dataset of publicly listed firms from five Southeast Asian countries (Indonesia, Malaysia, the Philippines, Singapore, and Thailand) over the period 2014–2023, the analysis employs fixed effects regression models incorporating country, industry, and year fixed effects. The results show that board gender diversity is negatively and significantly associated with Tobin’s Q, indicating that increased female representation on boards is linked to lower market valuation. However, no significant effect is found on accounting-based …
Determinants Of M&A In Japan And Effect Of Governance Reform, Maytakorn Lumyongsathien
Determinants Of M&A In Japan And Effect Of Governance Reform, Maytakorn Lumyongsathien
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the evolving role of private equity (PE) in Japan’s mergers and acquisitions (M&A) landscape, with particular attention to three critical stages: target selection, deal completion, and the influence of board independence. Analyzing M&A transactions across the pre- and post-2015 period, we find that PE acquirors consistently target firms characterized by low profitability, high leverage, and high asset tangibility suggesting an emphasis on unlocking value through operational turnaround and debt-financed restructuring. The probability of deal completion increases when targets exhibit weaker financial performance but stronger collateral, consistent with the use of leveraged buyout strategies. Importantly, the implementation of …
Tax-Incentivized Esg Funds And Esg Bond Yields: Evidence From An Emerging Market, Phanjarat Daengnimvikul
Tax-Incentivized Esg Funds And Esg Bond Yields: Evidence From An Emerging Market, Phanjarat Daengnimvikul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the presence of an ESG yield spread in Thailand’s bond market and evaluates the impact of the Thai ESG Fund policy launched in Q4 2023. Using a matched sample of ESG and conventional bonds issued from 2018–2024, we apply Exact Matching, Propensity Score Matching (PSM), and Difference-in-Differences (DiD) techniques to examine whether ESG bonds offer lower yields and whether the introduction of tax-incentivized ESG funds has influenced bond pricing. Results indicate a significant ESG yield spread in both corporate and government segments prior to the policy. However, while the spread remained unchanged for government bonds, it narrowed …
Share Pledging And Firm Performance: Evidence From Thailand, Natchakan Kanjanaphan
Share Pledging And Firm Performance: Evidence From Thailand, Natchakan Kanjanaphan
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the relationship between share pledging intensity in credit balance accounts and firm performance and risk among publicly listed companies in Thailand. Using a balanced panel dataset of all common stocks listed on the Stock Exchange of Thailand (SET) and the Market for Alternative Investment (mai) from December 2015 to December 2024, the analysis explores how pledging activity relates to firm outcomes across different firm sizes. Firm performance is measured using Return on Assets (ROA) and Tobin’s Q, while firm risk is assessed through cash flow volatility, stock return volatility, and idiosyncratic volatility. Employing fixed effects panel regression …
The Impact Of Carbon Emissions On Stock Price Movements: Evidence From The Thai Market, Punnawit Saengchanthanu
The Impact Of Carbon Emissions On Stock Price Movements: Evidence From The Thai Market, Punnawit Saengchanthanu
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the impact of carbon emissions on stock price movements in the Thai market, focusing on whether direct (Scope 1) and indirect (Scope 2 & 3) emissions influence stock returns. Additionally, it investigates how financial leverage moderates this relationship. Using data from 173 firms listed on the Stock Exchange of Thailand (SET) between 2019 and 2023, the study applies an abnormal return model to assess investor reactions to changes in carbon scores. The findings indicate that carbon emissions do not significantly impact stock prices, suggesting that Thailand’s market may not fully price carbon risk. These results align with …
The Effect Of Reit Characteristics And Regulations On Dividend Payment: Evidence From Thailand, Nitinat Vienthong
The Effect Of Reit Characteristics And Regulations On Dividend Payment: Evidence From Thailand, Nitinat Vienthong
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aims to examine the effects of various characteristics of Real Estate Investment Trusts (REITs) on dividend payouts among Thai REITs listed on the Stock Exchange of Thailand (SET) from 2018 to 2024. Specifically, it investigates how dividend smoothing, asset ownership structure, managerial gender, and regulatory policies influence dividend distributions. The analysis is conducted using a Fixed Effects panel regression model. The purpose of this study is to provide empirical insights to better understand the key drivers of dividend payment behavior among Thai REITs. The result of this study finds that. First, it investigates the extent to which Thai …
The Impact Of Quantitative Easing Policy On Bank Riskiness, Sandar Pyae Phyoe
The Impact Of Quantitative Easing Policy On Bank Riskiness, Sandar Pyae Phyoe
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the impact of Quantitative Easing (QE) on bank riskiness across 18 countries from 2001 to 2023. Using a panel dataset and Generalized Method of Moments (GMM) estimation, this research explores the relationship between QE and bank risk-taking behavior, with a particular focus on differences between advanced and emerging economies. The results indicate that QE generally increases bank riskiness, as reflected by a significant decline in Z-Scores, particularly in advanced economies where prolonged monetary easing compresses net interest margins and incentivizes riskier lending practices. In emerging markets, however, the impact of QE appears delayed, with positive effects on …
The Impact Of Carbon Emissions On Corporate Financial Performance: The Moderating Role Of Corporate Governance, Pornpitak Jomsubjaroen
The Impact Of Carbon Emissions On Corporate Financial Performance: The Moderating Role Of Corporate Governance, Pornpitak Jomsubjaroen
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the relationship between corporate carbon emissions and financial performance, focusing on the moderating role of corporate governance. Using panel data from 1,368 firms across 22 countries in high-carbon-emitting industries between 2015 and 2024, the analysis incorporates Scope 1, Scope 2, Scope 3, and total emissions as independent variables. Financial performance is measured using both Return on Assets (ROA) and Tobin’s Q, while corporate governance is evaluated through ESG governance pillar scores. The findings reveal that Scope 1 emissions are positively and significantly associated with ROA, indicating that emission-intensive firms—especially in production-driven industries—may achieve higher profitability. Scope 2 …
Competitiveness And The Impact Of Esg Scores On The Cost Of Debt, Jiranan Luangkrajang
Competitiveness And The Impact Of Esg Scores On The Cost Of Debt, Jiranan Luangkrajang
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the relationship between Environmental, Social, and Governance (ESG) scores and the cost of debt across Asian markets, focusing on the moderating role of market competition and the distinction between sustainability-focused and non-sustainability-focused firms. The analysis employs cross-sectional regression techniques and comprehensive statistical approaches, incorporating industry-level competitiveness measures and firm-level ESG performance. By examining how varying ESG scores influence borrowing costs under different competitive pressures, the study provides critical insights into corporate financial outcomes.
Comparative Effects Of Esg Disclosure And Performance On Corporate Debt Financing Costs: Evidence From The Asia-Pacific Region, Chanakan Mungkarak
Comparative Effects Of Esg Disclosure And Performance On Corporate Debt Financing Costs: Evidence From The Asia-Pacific Region, Chanakan Mungkarak
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper examines the comparative effects of ESG disclosure and ESG performance on corporate debt financing costs of the firms in Asia-Pacific countries during the year 2014 to 2023. Grounded in signaling and stakeholder theories, the analysis assesses whether lenders respond more to transparency or actual ESG implementation. The findings show that ESG performance consistently has a stronger and more significant impact on reducing borrowing costs than ESG disclosure. In models including both variables, only ESG performance remains significant. Robustness checks using an ESG gap score reveal that in developed economies, firms with misaligned disclosure and performance are penalized, while …
Esg Performance And Its Impact On Systematic Risk And Idiosyncratic Risk: Evidence From Emerging Asia, Kunlaphat Trongpanich
Esg Performance And Its Impact On Systematic Risk And Idiosyncratic Risk: Evidence From Emerging Asia, Kunlaphat Trongpanich
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the relationship between ESG performance and corporate risk, focusing on systematic and idiosyncratic components. Using panel data from 264 listed companies in six Emerging Asian markets between 2014 and 2023, the analysis employs fixed-effects regression models. The results indicate that ESG performance significantly reduces idiosyncratic risk but has no clear effect on systematic risk. Among ESG pillars, the Social Score shows the strongest risk-reducing effect. Additionally, ESG proves more effective in mitigating firm-specific risk during periods of economic crisis, such as the COVID-19 pandemic, China stock market crash and the Russia–Ukraine conflict. Firms involved in ESG controversies …
The Impact Of Esg And Digital Transformation On Firm Value: Evidence From Thailand, Chaiyavit Jungprasert
The Impact Of Esg And Digital Transformation On Firm Value: Evidence From Thailand, Chaiyavit Jungprasert
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper investigates the impact of Environmental, Social, and Governance (ESG) scores, digital transformation, and their incremental effect influence on corporate value, measured by Tobin's Q, among SET100 companies. The paper uses a fixed-effects panel regression with data from 2017 to 2023 to determine how these characteristics influence firm valuations. The result shows that ESG scores has a statistically significant positive effect on business value, implying that investors prefer companies with high ESG scores, particularly in the environmental and social domains. However, governance scores don't appear to have a major impact on firm value. Furthermore, the study shows that digital …
Investors' Response On Movie Distributors' Achievements, Kanathip Bumroongchai
Investors' Response On Movie Distributors' Achievements, Kanathip Bumroongchai
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research examines the impact of movie-related factors on the abnormal returns of movie distributor stocks in the United States, focusing specifically on gross opening revenues and industry awards. The study analyzes nine firms using monthly data from 1995 to 2024 and applies the Ordinary Least Squares (OLS) model to test the hypotheses. The findings reveal that only awards received by competitors significantly reduce a firm’s abnormal returns, supporting both the Asymmetric Information Theory and Social Comparison Theory. In contrast, the gross opening revenues of a firm’s own movies do not lead to abnormal returns, aligning with the Efficient Market …
Impact Of Diversity, Inclusion, And People Development (Dip) To Firm’S Value: Moderating Role Of Institutional Ownership And Governance In Emerging Asia, Jaruwan Wankeaw
Impact Of Diversity, Inclusion, And People Development (Dip) To Firm’S Value: Moderating Role Of Institutional Ownership And Governance In Emerging Asia, Jaruwan Wankeaw
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the impact of Diversity, Inclusion, and People development (DIP) on firm value (Tobin’s Q) in Emerging Asia by utilizing DIP index during 2016-2023 and explore the moderating roles of institutional ownership and corporate governance. This study employs OLS regression models with fixed effect controls. The results reveal that the composite DIP score is positively and significantly associated with firm value, indicating that firms investing in people-centered practices benefit from enhanced market valuation. This study suggests that institutional ownership significantly moderates the effect of people development, they enhance the effectiveness of firm-level investments in employees. However, it does …
Exploring The Efficacy Of Expressive Arts Therapy In Enhancing Emotional Regulation Among Adults Of Authoritarian Caregivers: A Scoping Review, Kevin Suwan
Chulalongkorn University Theses and Dissertations (Chula ETD)
This scoping review synthesizes a decade of research on the role of Expressive Arts Therapy (EAT) in enhancing emotional regulation among adults raised by authoritarian caregivers. Guided by Arksey and O’Malley’s five-stage framework with the PRISMA-ScR reporting checklist, 43 peer-reviewed studies were identified across five electronic databases. The findings demonstrate that EAT, across five modalities (visual art, creative writing, music, dance/movement, and clay work), consistently fosters emotional awareness, strengthens distress tolerance, and supports the adaptive regulation of emotions. Multimodal and body-based approaches were especially effective for individuals whose early environments suppressed emotional expression. The review highlights EAT’s potential as a …
Marriage And Fertility Intentions Of Generation Y And Z Women In Beijing:A Qualitative Study, Hao Shi
Marriage And Fertility Intentions Of Generation Y And Z Women In Beijing:A Qualitative Study, Hao Shi
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper aimed to investigate the marriage and fertility intentions of Gen Z and Gen Y women living in Beijing, China, and examine the factors affecting their decisions regarding marriage and fertility intentions. I employed the method of in-depth interviews, conducting 20 interviews online between April and June 2025. The key findings reveal explicit attitudes among the women from Generation Y and Generation Z in Beijing. A qualitative analysis confirmed three major themes: (1) career-centered identity and the deprioritization of family planning; (2) fear of marriage and childbearing; and (3) awakening of individualism. Many participants expressed a low willingness to …
Following The Experts: Identifying What Influences Returns From Analyst Recommendations, Patitan Suppasupanya
Following The Experts: Identifying What Influences Returns From Analyst Recommendations, Patitan Suppasupanya
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the impact of analyst consensus recommendations on stock returns in the Thai market, focusing on whether factors such as analyst qualifications, institutional ownership, and macroeconomic indicators influence the effectiveness of these recommendations. Using panel data from 30 stocks in the SET Index, this research employs a fixed effects regression model to analyze the relationship between analyst consensus and future stock performance. The findings reveal that while analyst consensus provides a general direction for investment decisions, its predictive power varies based on institutional ownership, consumer confidence, and unemployment rates. Institutional ownership appears to enhance the accuracy of recommendations, …
Electrochemical Regeneration Of Spent Monoethanolamine Solution After Carbon Dioxide Capture And Mineralization By Calcium Sulfate Addition, Nathaporn Kenbubpha
Electrochemical Regeneration Of Spent Monoethanolamine Solution After Carbon Dioxide Capture And Mineralization By Calcium Sulfate Addition, Nathaporn Kenbubpha
Chulalongkorn University Theses and Dissertations (Chula ETD)
Carbon dioxide (CO2) is widely recognized as the primary greenhouse gas (GHG) driving global warming. Since the onset of the Industrial Revolution around 1850, the average atmospheric concentration of CO2 has steadily increased, reaching approximately 426 ppm as of March 2025. As a result, Carbon Capture, Utilization, and Storage (CCUS) has become a critical approach to mitigate this issue. Monoethanolamine (MEA) solution is widely used in various industries to capture CO2; however, the regeneration of MEA remains a challenge due to the high energy demands associated with the conventional stripping method, which requires boiling the solution. This study successfully developed …
End-To-End Development Of Mandible Reconstruction Using Machine Learning, Nattapon Kamboonsri
End-To-End Development Of Mandible Reconstruction Using Machine Learning, Nattapon Kamboonsri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Virtual surgical planning (VSP) is a critical step in mandible reconstruction surgery, which involves preoperative planning and implant design to restore mandibular defects. This study focuses on two essential components of VSP: (1) mandible segmentation, specifically the separation of healthy and defective regions, which currently relies on manual annotation, and (2) generation of the complete mandible, where traditional approaches such as mirroring the contralateral side often fail in scenarios involving midline-crossing defects. While recent automated methods have addressed mandible segmentation from CT scans, they typically focus only on binary segmentation and often utilize conventional UNet-based architectures that suffer from limited …
การศึกษาลักษณะของผู้ขับขี่รถจักรยานยนต์และพื้นที่ปลอดภัยในสภาพการขับขี่ตามธรรมชาติในกรุงเทพฯ, ยุวไร ไวสะอาด
การศึกษาลักษณะของผู้ขับขี่รถจักรยานยนต์และพื้นที่ปลอดภัยในสภาพการขับขี่ตามธรรมชาติในกรุงเทพฯ, ยุวไร ไวสะอาด
Chulalongkorn University Theses and Dissertations (Chula ETD)
การศึกษานี้มุ่งเน้นการวิเคราะห์พฤติกรรมของผู้ขับขี่รถจักรยานยนต์และพื้นที่ความปลอดภัยในสภาพการขับขี่จริงในเขตเมืองกรุงเทพมหานคร โดยใช้แนวทางการศึกษาพฤติกรรมแบบธรรมชาติ (Naturalistic Riding Study) เพื่อตรวจสอบลักษณะพฤติกรรมของผู้ขับขี่และระดับพื้นที่ปลอดภัยในสภาพแวดล้อมการจราจรจริง เช่น การวัดเป็นเวลาเว้นระยะด้านหน้า ระยะห่างด้านข้าง ลักษณะของยานพาหนะรอบข้าง โดยการติดตั้งอุปกรณ์ตรวจวัดและบันทึกข้อมูล เช่น 3D LiDAR สำหรับตรวจจับตำแหน่งของวัตถุรอบข้าง, ระบบ CAN Bus สำหรับอ่านค่าความเร็วและการเร่งของรถจักรยานยนต์, กล้องบันทึกวิดีโอ และคอมพิวเตอร์สำหรับประมวลผล เพื่อประเมินระดับความปลอดภัยในขณะขับขี่ในสภาวะปกติ (Cruising) โดยรถจักรยานยนต์ทดลองที่มีขนาดกว้าง 0.74 เมตร และยาว 1.94 เมตร เพื่อเก็บข้อมูลจากกลุ่มตัวอย่างผู้ขับขี่จำนวน 20 คน ซึ่งมีประสบการณ์และความมั่นใจในการขับขี่บนถนนสายหลัก จากข้อมูลทั้งหมด 2,828 เหตุการณ์ พบว่าผู้ขับขี่ทั้งหมด มีค่าเฉลี่ยระยะห่างด้านข้าง (Lateral Clearance: Wa) เท่ากับ 1.47 เมตร และเวลาเว้นระยะด้านหน้า (Time Headway: TH) เท่ากับ 0.82 วินาที ผลการทดลองนี้แสดงให้เห็นว่าผู้ขับขี่ในกลุ่มที่มีความเสี่ยงต่ำมีแนวโน้มเว้นระยะห่างมากกว่ากลุ่มเสี่ยงปานกลางอย่างชัดเจน ซึ่งสามารถนำไปใช้เป็นแนวทางในการกำหนดมาตรการด้านความปลอดภัย และการพัฒนาเทคโนโลยีช่วยขับขี่สำหรับผู้ใช้รถจักรยานยนต์ ซึ่งจะช่วยลดความเสี่ยงของอุบัติเหตุและเพิ่มความปลอดภัยให้กับผู้ใช้ถนนในประเทศไทย