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Adsorption Behavior Of Air-Pollution Gases On Boron Nitride Nanotubes For Gas Sensing And Storage, Viny Alfiyah
Adsorption Behavior Of Air-Pollution Gases On Boron Nitride Nanotubes For Gas Sensing And Storage, Viny Alfiyah
Chulalongkorn University Theses and Dissertations (Chula ETD)
Structures of pristine (5,5) and (10,0) BNNTs, their Al-, Ga-, Cr- and Fe-doping derivatives, and their adsorption structures with H2O, H2S, SO2, CO2, CO, NH3, N2O, and NO were explored using periodic DFT/PBEPBE/ method. N2O and SO2 adsorbed either on the Cr-(5,5) or Cr-(10,0) BNNT were found to be the strongest and the second-strongest adsorptions, respectively. N2O adsorption either on the Cr-(5,5) or Cr-(10,0) BNNT found as dissociative chemisorption is suggested as the catalyst for reductive conversion of N2O to N2 and O2 gases, of which overall reaction of -0.253 eV was found. Cr-(5,5) and Cr-(10,0) BNNTs are suggested as …
Antioxidant And Anticancer Activities Of Polysaccharide Extracted From White-Rot Fungus Trametes Polyzona Cu07, Budi Kurniawan
Antioxidant And Anticancer Activities Of Polysaccharide Extracted From White-Rot Fungus Trametes Polyzona Cu07, Budi Kurniawan
Chulalongkorn University Theses and Dissertations (Chula ETD)
Over the last decade, fungal polysaccharides have gained interest for their therapeutic activity as anticancer agent. This research aimed to investigate a newly isolated Trametes polyzona CU07 for its anticancer and antioxidant activity. CTPPs, an obtained crude polysaccharides of T. polyzona were extracted by hot water from its mycelia. Subsequently, the extract was analysed its chemical properties. Scavenging activity on ABTS and DPPH was evaluated for antioxidant performance. Furthermore, the anticancer activity was evaluated by performing the inhibitory effects, proliferation, apoptosis induction and colony formation assay. MCF-7 cell line and triple negative breast cancer (MDA-MB-231 and MDA-MB-468) were used as …
Synthesis Of Thymol Derivatives And Their Inhibitory Effects On Alpha-Glucosidase And Tyrosinase, Ahmad Ullah Safi
Synthesis Of Thymol Derivatives And Their Inhibitory Effects On Alpha-Glucosidase And Tyrosinase, Ahmad Ullah Safi
Chulalongkorn University Theses and Dissertations (Chula ETD)
Diabetes is a chronic disease all over the world. More than 90% of patients have diabetes of type II and require effective methods to control their blood glucose. A promising treatment for diabetes mellitus is to reduce postprandial hyperglycemia by using α-glucosidase inhibitors to prevent carbohydrate digestion. Thymol is a naturally occurring monoterpene. Thymol motifs have a wide range of biological activities, including anti-cancer, antibacterial, antimalarial, antifungal and antioxidant. In this study, thymol-esters AS01-AS04, piperazine-containing thymols AS15-AS17 and thymol acetohydrazones AS21-AS49 were synthesized and subjected to α-glucosidase inhibitory activities. AS21-AS49 were obtained as a mixture of geometrical isomers (E/Z). All …
Structural Evolution Of The Phu Kradung Formation By Calcite Veins Characterization, South Of Lam Sonthi District, Lopburi Province., Ausa Nonthason
Structural Evolution Of The Phu Kradung Formation By Calcite Veins Characterization, South Of Lam Sonthi District, Lopburi Province., Ausa Nonthason
Chulalongkorn University Theses and Dissertations (Chula ETD)
Calcite veins in Mesozoic sedimentary rock localities are found in the southern part of Lam Sonthi district, Lopburi province, in central Thailand, near the Loei-Petchabun fold belt regions. The vein’s host rocks are siliciclastic rocks, primarily mudstone and sandstone. The main aim of this study is to learn more about calcite vein geometry and development, as well as the structural evolution of calcite veins in the Phu Kradung formation in the Lam Sonthi area of Lopburi province. A petrographic and structural analysis of the veins was performed to examine the kinematics and geological structures of the calcite vein in the …
Phytochemical Of Dioscorea Bulbifera For Cosmeceuticals, Shabnam Pari
Phytochemical Of Dioscorea Bulbifera For Cosmeceuticals, Shabnam Pari
Chulalongkorn University Theses and Dissertations (Chula ETD)
People across various cultures have utilized plant-based substances to enhance their appearance, and cosmetics with active agents to lighten skin tone has been used. Skin whitening practices typically involve chemical constituents designed to reduce melanin and oxidative stress. People worldwide prefer using natural products to enhance their appearance due to its safety and less side effects. The intake of plant-derived bioactive agents has become increasingly popular due to their health benefits. Different forms of plants contain varying quantity of bioactive compounds. For example, drying, a common method of food preparation, significantly impacts the quantity of these compounds. Fresh and dried …
Development Of Antioxidant From Spent Coffee Ground And Its Appication, Chitinsee Paidech
Development Of Antioxidant From Spent Coffee Ground And Its Appication, Chitinsee Paidech
Chulalongkorn University Theses and Dissertations (Chula ETD)
Spent coffee grounds (SCG) are a by-product from coffee brewing process. SCG contains a considerable amount of organic compounds and is a great source of antioxidants. This research aimed to evaluate the antioxidant activities of SCG and SCG extracts by comparing different solvent (hexane and 60 - 90% ethanol) extractions, together with determining the effect of different concentration (5, 10, 15, 20 and 25%) of SCG extracts (SCG) and comparing these extracts with commercial antioxidants (BHA (A), BHT (T), tocopherol (TO)) for application to vegetable oil. The results showed that the total phenolic content (TPC) of SCG was 16.49 mg …
Effect Of Fuel Type On The Characteristics And Photocatalytic Activity Of Zno Nanoparticles Synthesized Via Solution Combustion Method, Shabnam Purmahammad Abdollahi
Effect Of Fuel Type On The Characteristics And Photocatalytic Activity Of Zno Nanoparticles Synthesized Via Solution Combustion Method, Shabnam Purmahammad Abdollahi
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study explores the impact of organic fuels (agar, glucose, and cotton) and their fuel-to-oxidizer ratios (ф) on the properties and photocatalytic performance of ZnO nanoparticles synthesized via solution combustion. XRD, SEM, BET, DRS, and PL spectroscopy were used for characterization. Photocatalytic activity was evaluated by degrading methyl orange dye under UV light. The fuel choice and fuel-to-oxidizer ratio significantly influenced the structural, morphological, textural, and optical properties of the ZnO nanoparticles, affecting their photocatalytic efficiency. ZnO prepared with a glucose fuel-to-oxidizer ratio of ф=1.5 showed the highest photodegradation efficiency of 98%, due to its high surface area (8.27 m2/g), …
Characterization Of Aroma-Active Compounds In Fried Chicken, Nattapon Deesom
Characterization Of Aroma-Active Compounds In Fried Chicken, Nattapon Deesom
Chulalongkorn University Theses and Dissertations (Chula ETD)
Fried chicken is a product with high consumption demand both in Thailand and abroad. Thailand ranks as the world's 4th largest in terms of export volume, accounting for 105 million baths. In addition, there is a growing preference for white meat among consumers today, leading to increased consumption rates of fried chicken. Therefore, quality control is essential, especially regarding aroma, which is the first sensory perception people experience with food. In this work, olfactory profile of fried chicken was first constructed to evaluate extracts obtained from different organic solvents. The dichloromethane extracts obtained from solvent assisted flavor evaporation (SAFE) showed …
Electrochemical Dna Super-Sandwich Biosensor For Porcine Dna Adulteration Detection In Foods, Vasita Lapeee
Electrochemical Dna Super-Sandwich Biosensor For Porcine Dna Adulteration Detection In Foods, Vasita Lapeee
Chulalongkorn University Theses and Dissertations (Chula ETD)
Amid increasing concerns over meat adulteration and mislabeling, which impact consumer trust, especially among people who are forbidden from consuming certain meats due to religious, cultural, and health reasons, there is a need for reliable detection methods. Although standard methods for genetic material detection, such as DNA amplification, offer high sensitivity, they also present limitations in terms of cost, instrument complexity, and lengthy detection times. Addressing these limitations, this thesis focuses on developing an electrochemical DNA sensor for detecting porcine DNA contamination in food without prior DNA amplification. The proposed method is straightforward, rapid, and cost-effective. The detection process involves …
Volatile Compound Profiles In Human Sweat Before And After Covid-19 Vaccination, Sorachar Phusrisom
Volatile Compound Profiles In Human Sweat Before And After Covid-19 Vaccination, Sorachar Phusrisom
Chulalongkorn University Theses and Dissertations (Chula ETD)
Vaccines have been reported to be effective at preventing people from getting the coronavirus (COVID-19) as well as reducing the harmful levels. This led to incorporation of the vaccinations into the protection protocol worldwide. The vaccinations could influence metabolisms, microbiome and metabolite distribution throughout human bodies including skin. This thesis applied gas chromatography ion mobility spectrometry (GC-IMS) and gas chromatography mass spectrometry (GC-MS) to differentiate the population with COVID-19 vaccination based on their different sweat volatile compound profiles. This involves tentative identification of 160 axillary swab samples obtained from 20 healthy volunteers before or after the COVID-19 vaccination at different …
Α-Glucosidase Inhibitors From Leaves Of Cannabis Sativa And Cannabinoid Derivatives, Areeba Nayab
Α-Glucosidase Inhibitors From Leaves Of Cannabis Sativa And Cannabinoid Derivatives, Areeba Nayab
Chulalongkorn University Theses and Dissertations (Chula ETD)
Cannabinoids are naturally occurring secondary metabolites with antidiabetic, anti-inflammatory, and anticancer activity because of their enormous interaction efficiency with the human endocannabinoid system. α-glucosidase inhibitory activity guided isolation of Cannabis sativa L. yielded 6 compounds including Δ9-THC, cannabinol (CBN), and cannabichromene (CBC) as major compounds. This study also focused on the study of the structure-activity relationship of Δ9-THC that yielded 4 including 3 new compounds. The structures of isolated and synthesized compounds were elucidated by multiple spectroscopic techniques and with the comparison of previous reports. The isolated and derivatized compounds were evaluated for α-glucosidase inhibition. Among the isolated compounds cannabinol …
Microalgal-Plant Growth Promoting Bacterial Living Biofilters As Soil Amendment For Vegetable Cultivation, Augustine Odibo
Microalgal-Plant Growth Promoting Bacterial Living Biofilters As Soil Amendment For Vegetable Cultivation, Augustine Odibo
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study explored the use of microalgal-plant growth-promoting bacterial co-cultures as living biofilters (Chlorella vulgaris (CV) and Bacillus subtilis (BS) in different ratios) for soil amendment in vegetable cultivation. It aimed to investigate the soil amendment potential of these biofilters on three selected plants (i.e. morning glory, sunflower, and cucumber) over a 20-days plantation in a controlled environment. The highest biomass yields of morning glory, cucumber, and sunflower were 1.3 ± 0.1 g, 2.0 ± 0.3 g, and 1.5 ± 0.2 g when using CV/BS 1:1, CV/BS 3:1, and CV/BS 3:1 respectively. For sunflower, the biomass yield with CV/BS 1:1, …
Geophysical Characteristics Of Kuan Kreng Peat Swamp Forest At Thale Noi Area, Theethach Phiranram
Geophysical Characteristics Of Kuan Kreng Peat Swamp Forest At Thale Noi Area, Theethach Phiranram
Chulalongkorn University Theses and Dissertations (Chula ETD)
Peatlands, as an important carbon sink, store a large amount of atmospheric carbon. However, peatlands are vulnerable to environmental alteration due to anthropogenic and natural processes. While peatlands are degraded, carbon dioxide emissions arise. The Kuan Kreng peat swamp forest is the second largest peatland in Thailand and is in coastal wetland serving for carbon stock in the subsurface. To assess carbon stock in peatland, the thickness and distribution of the peat layer are necessary. This study determines physical and chemical characteristics of the peatlands in the coastal wetland, southern Thailand by conventional core study and geophysical surveys, including ground …
The Effect Of Cannabidivarin On T-Cell Line Proliferation And Activation, Wilai Laolee
The Effect Of Cannabidivarin On T-Cell Line Proliferation And Activation, Wilai Laolee
Chulalongkorn University Theses and Dissertations (Chula ETD)
The non-psychotropic cannabinoid cannabidivarin (CBDV) is a propyl analog of cannabidiol (CBD). Although it was discovered that CBD had immunosuppressive properties, little is known about CBDV in this regard. To investigate the effects of CBD and CBDV on T-cell activation and proliferation, two T-cell lines—Jurkat and MOLT-4—were treated with the compounds at different doses. Utilizing the WST-1 assay (cell viability) and the Annexin V/PI staining assay (apoptosis test), cell cytotoxicity was investigated. Carboxyfluorescein diacetate succinimidyl ester (CFSE) staining was used to examine the proliferation of cells. Cell cycle kits and flow cytometry were used as the analysis technique to examine …
'Development Of A Biodegradable, Mineralized Nanocellulose Scaffold For Osteochondral Tissue Engineering', Sairash -
Chulalongkorn University Theses and Dissertations (Chula ETD)
Osteochondral lesions, affecting both the articular cartilage and the subchondral bone, present complex mechanical and biochemical challenges. Osteochondral construct development holds promise for forming tissue at the transition zone to bone. This study introduces a strategic bilayer polymeric hydrogel by combining bacterial nanocellulose, gelatin, and alginate in one layer, while the other layer was the same three biopolymers mineralized with nanohydroxyapatite through alternating incubation cycles of calcium chloride (CaCl2) and disodium phosphate (Na2HPO4). Furthermore, the oxidized bacterial nanocellulose was effectively mineralized with calcium and phosphorus, as confirmed by EDX analysis. Remarkably, both layers of the biphasic hydrogel demonstrated excellent cytocompatibility …
Differential Protein Expression Profile In Encapsulated Follicular-Pattern Thyroid Tumors, Nguyen Phan Xuan Truong
Differential Protein Expression Profile In Encapsulated Follicular-Pattern Thyroid Tumors, Nguyen Phan Xuan Truong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Diagnosing encapsulated follicular-patterned thyroid tumors such as Invasive Encapsulated Follicular Variant Papillary Thyroid Carcinoma (IEFVPTC), Non-invasive Follicular Thyroid Neoplasm with Papillary-like Nuclear Features (NIFTP), and Well-Differentiated Tumor of Uncertain Malignant Potential (WDT-UMP) is challenging due to their morphological and molecular similarities. This study aimed to investigate the protein distinctions among these three thyroid tumors and uncover biological insights into tumorigenesis through proteomic analysis. We also evaluated the practicality and clinical value of a protein biomarker panel defined by machine learning for identifying IEFVPTC, initially using formalin-fixed paraffin-embedded (FFPE) samples. We performed a total shotgun proteome analysis, quantifying the expression of …
The Influence Of Host Blood Hla Typing To Tumor Microenvironment In Egfr Mutated Advanced Stage Non-Small Cell Lung Cancer, Korakot Srianuwattipong
The Influence Of Host Blood Hla Typing To Tumor Microenvironment In Egfr Mutated Advanced Stage Non-Small Cell Lung Cancer, Korakot Srianuwattipong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Advanced non-small cell lung cancer with EGFR mutation, treated with EGFR-targeted therapy, exhibits varying disease control periods associated with the tumor microenvironment. It is anticipated that differences in the tumor microenvironment arise from variations in the HLA subtypes of individuals. Therefore, this study was conducted to assess the relationship between the tumor microenvironment and HLA subtypes. Method: 100 patients with advanced non-small cell lung cancer harboring EGFR mutations and treated with EGFR-targeted therapy at King Chulalongkorn Memorial Hospital had been enrolled, blood samples were collected for HLA typing, and tissue specimens were subjected to immunohistochemistry staining for PD-L1 and …
Comparison Of Modified Formalism Output And Trs-398 Absorbed Dose To Water In Electron Beams Reference Dosimetry In Multiple Radiotherapy Centers, Yasumon Thinka
Chulalongkorn University Theses and Dissertations (Chula ETD)
The study aimed to investigate the feasibility and efficacy of utilizing modified calibration with cylindrical chambers for reference dosimetry in electron beam radiotherapy, challenging the recommendation of using plane-parallel chambers in low-energy electron beams by IAEA's TRS-398 and AAPM's TG-51 standards. Data collection involved six radiotherapy centers in Bangkok using Varian linear accelerators, with chambers including the IBA FC65-G, PTW 30013 cylindrical chambers, and PPC40, Roos plane-parallel chambers. Results of dose comparison between modified and TRS-398 protocols fell within ±2%. For low-energy electron beams, percent dose discrepancies ranged from -1.57% to 0.91%, and from -0.37% to 0.91% for high-energy. The …
Characteristics Of Two-Dimensional Ionization Chamber Array For Patient-Specific Quality Assurance In Pencil Beam Scanning Proton Therapy, Nuttida Rawiwan
Characteristics Of Two-Dimensional Ionization Chamber Array For Patient-Specific Quality Assurance In Pencil Beam Scanning Proton Therapy, Nuttida Rawiwan
Chulalongkorn University Theses and Dissertations (Chula ETD)
Proton therapy is an advanced technique that uses positive particles in external treatment. It can spare normal tissue and increase tumor control probability. In radiotherapy, patient-specific quality assurance is an important part, but according to protons’ characteristics, especially finite range, it is challenging to do verification because when the density has changed the finite range will have drastic changes. Although the two-dimensional ionization chamber array is used for patient-specific quality assurance in pencil beam scanning proton therapy, most studies investigate the IBA MatriXX as the dosimetry device, and few studies explored the PTW OCTAVIUS 1500XDR. This research aims to determine …
A Study Of The Characteristics And Associative Factors In Alterations Of Plantar Pressure In Parkinson’S Patients With Freezing Of Gait, Thanawan Tiraweerakhajorn
A Study Of The Characteristics And Associative Factors In Alterations Of Plantar Pressure In Parkinson’S Patients With Freezing Of Gait, Thanawan Tiraweerakhajorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Freezing of gait (FOG) poses a significant challenge in advanced Parkinson’s Disease (PD), manifesting as abrupt interruptions in forward movement within the gait cycle. Plantar pressure, notably heel strike dynamics, has emerged as a pivotal parameter associated with FOG. Materials and Methods: A retrospective analysis was conducted on clinical data and Strideway® System records from PD patients diagnosed with FOG via gold standard objective gait. Demographics, clinical assessments, plantar pressure metrics, and spatiotemporal gait parameters were collected. Results: 100 PD patients with FOG were included. Plantar pressure during the heel strike phase exhibited reductions in stages 2-3, with an …
Prevalence Of Obstructive Sleep Apnea And Accuracy Of Home Sleep Apnea Test (Type 3) For Obstructive Sleep Apnea Diagnosis In Difficult To Treat Asthma, Tidarat Somruesaen
Prevalence Of Obstructive Sleep Apnea And Accuracy Of Home Sleep Apnea Test (Type 3) For Obstructive Sleep Apnea Diagnosis In Difficult To Treat Asthma, Tidarat Somruesaen
Chulalongkorn University Theses and Dissertations (Chula ETD)
BACKGROUND Prevalence of obstructive sleep apnea (OSA) was previously reported to be higher in asthma particularly in severe and difficult-to-treat subgroups, about 74.5% However, there is currently no available data from Thailand to define the accuracy of type 3 home sleep apnea test for the OSA diagnostic in difficult to treat asthma. OBJECTIVES: The primary objective is to study the prevalence of OSA in patients with difficult-to-treat asthma. The secondary objective is to assess the accuracy of type 3 home sleep apnea test (HSAT) for OSA diagnosis compared to standard type 1 polysomnography in patients with difficult-to-treat asthma. METHODS: Patients …
Impact Of Fund Manager Characteristics On Thailand Domestic Equity Mutual Fund Performance, Krisana Rathanit
Impact Of Fund Manager Characteristics On Thailand Domestic Equity Mutual Fund Performance, Krisana Rathanit
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper aims to reconsider whether mutual funds managers’ characteristics, including gender, working experience (tenure), and CFA designation, affect the fund risk-adjusted performance, using the Thai open-ended domestic equity funds from 2018 to 2023. The first objective is to examine whether each fund manager characteristic impacts the fund risk-adjusted performance (alpha), including Jensen’s, 3-factor Fama French, and 5-factor Fama French alpha, using the pooled ordinary least square (OLS) regression. The alphas are estimated over the 24-month rolling window. The second objective of the study, as the extension of the first objective, is to examine the fund performance persistence over the …
“The Dual Impact Of Transportation Infrastructure And Telecommunication Technology On Analyst Coverage And Forecast Accuracy: Evidence From The Thai Market?”, Kittipoj Rujjanavate
“The Dual Impact Of Transportation Infrastructure And Telecommunication Technology On Analyst Coverage And Forecast Accuracy: Evidence From The Thai Market?”, Kittipoj Rujjanavate
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper investigates the determinants of forecast accuracy and brokerage coverage in the Thailand stock market from 2009 to 2022. Leveraging a comprehensive dataset comprising various financial metrics and market variables, we explore the impact of infrastructure development, digital communication, and external factors such as the Covid-19 pandemic on analysts' forecast accuracy and the coverage of stocks by brokerage firms. Our analysis employs regression models to examine the relationships between these variables and forecast accuracy, as measured by the absolute deviation between predicted and actual earnings, and brokerage coverage, quantified by the number of brokerage firms covering a particular stock. …
Oil Price Volatility And Bond Credit Spread: Evidence From Thailand, Natasha Thatchaichawalit
Oil Price Volatility And Bond Credit Spread: Evidence From Thailand, Natasha Thatchaichawalit
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper studies the relationship between oil price volatility and corporate bond credit spread. The sample is selected from bonds offered by listed companies in energy and utility sector (categorized by the Thai Bond Market Association) whose profit directly relates to the oil price movement. The studied period is 10 years which covers January 2013 – December 2023. The period covers both upturn and downturn of oil price movement. For the oil price volatility proxy, this paper uses end of month data of OVX index and conditional variance of Brent return estimated with GARCH (1,1) model. After, controlling for other …
To What Extent Can The Yield Curve Spread Serve As A Tool For Market Timing In The Thailand Stock Market?, Chanon Rungruanglit
To What Extent Can The Yield Curve Spread Serve As A Tool For Market Timing In The Thailand Stock Market?, Chanon Rungruanglit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Despite its simplicity, the yield curve is one of the best predictors of future economic activity. Empirical studies suggest that the yield curve is capable of forecasting market downturn in major economies. In this paper, the relationship between the yield curve and stock market downturn will be studied with the focus on predicting market downturn in Thailand. Also, this paper seeks to answer the question if a market-timing strategy, based on yield-curve information, can outperform the market. The results of this study suggest that the spread between government bond indices with maturities of 3 to 7 years and 7 to …
The Effect Of Earnings Quality On Financial Analysts’ Dividend Forecast Error : The Moderating Roles Of Investor Sentiment And Economic Uncertainty, Tanabordee Jutaputthi
The Effect Of Earnings Quality On Financial Analysts’ Dividend Forecast Error : The Moderating Roles Of Investor Sentiment And Economic Uncertainty, Tanabordee Jutaputthi
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the influence of earnings quality on the accuracy of financial analysts' dividend forecasts for companies listed on the Thailand Stock Market Exchange (SET) and the Market for Alternative Investment (mai) for the period from 2015 to 2022. using a sample of 891 observations. focusing on the moderating roles of investor sentiment and economic uncertainty. The findings reveal that good earnings quality helps reduce dividend forecast errors. We find no evidence of the moderating roles of investor sentiment and economic uncertainty, implying that analysts might possess the expertise to incorporate the implications of economic uncertainty into their forecasts …
The Impact Of Esg Performance On Stock Volatilityin Asia-Pacific Markets: The Moderating Rolesof Corruption And Economic Development, Thosaporn Tonghui
The Impact Of Esg Performance On Stock Volatilityin Asia-Pacific Markets: The Moderating Rolesof Corruption And Economic Development, Thosaporn Tonghui
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the impact of Environmental, Social, and Governance (ESG) disclosures and scores on stock volatility in Asia-Pacific markets. The paper also assesses the moderating roles of corruption and economic development in this relationship. Using data from 2010 to 2022, the research employs the Fama-French multi-factor models to analyze the relationship between ESG metrics and stock idiosyncratic volatility. The findings indicate that both ESG disclosure and higher overall ESG scores significantly reduce stock volatility, underscoring the importance of transparency and robust ESG practices in mitigating firm-specific risks. Additionally, the study reveals that the social and governance pillars of ESG …
The Intervention Of Shareholder Activism, Does It Actually Improve Firm Performance? Evidence From Apac, Burist Chertchoo
The Intervention Of Shareholder Activism, Does It Actually Improve Firm Performance? Evidence From Apac, Burist Chertchoo
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the influence of shareholder activism on the performance of 420 Asia-Pacific firms from 2013 to 2022, utilizing the Capital Asset Pricing Model and the Fama-French-Carhart model to assess abnormal returns. Findings indicate a generally positive trend in firm performance post-activism, particularly over long periods, suggesting activism's potential to drive sustained firm value improvements. In addition, there is no enough evidence to conclude that the target firms experience the pump-and-dump pattern after the departure of shareholder activists. However, the impact of specific activism strategies and outcomes on performance often lacks statistical significance, highlighting the multifaceted nature of activism's …
Board’S Gender Diversity And Educational Backgrounds As Determinants Of Cost Of Debt: Managerial Hierarchy Perspectives In Thai Financial Landscape, Pitchaya Thuwanaka
Board’S Gender Diversity And Educational Backgrounds As Determinants Of Cost Of Debt: Managerial Hierarchy Perspectives In Thai Financial Landscape, Pitchaya Thuwanaka
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the impact of board gender diversity, financial background, and educational diversity on the cost of debt for Thai listed companies, focusing on the SET50 firms from 2015-2016 and 2021-2022. Utilizing data from Refinitiv DataStream, SETSMART, and annual reports, this research examines whether the presence of women on boards, financial expertise, and diverse educational backgrounds influence borrowing costs. The findings reveal that female board members do not significantly impact the cost of debt, challenging common assumptions about gender diversity's financial benefits. In contrast, boards with directors possessing financial backgrounds, particularly those in chairman and executive management positions, are …
The Moderating Role Of Asset Tangibility, Economic Policy Uncertainty, And Control Of Corruption On The Impact Of Public Debt On Cost Of Debt And Investment, Raksit Lomtakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aims to explore two main objectives: first, to investigate the impact of public debt on corporate borrowing costs and investment activities; and second, to examine how moderating factors like Asset Tangibility (TAN), the World Uncertainty Index (WUI), and Control of Corruption (CC) shape this relationship. The findings reveal that higher public debt levels significantly increase corporate borrowing costs and reduce investment activities, underscoring the need for policymakers to adopt prudent fiscal strategies that balance debt management with fostering a supportive environment for private sector investment. Furthermore, the study highlights the moderating effects of Asset Tangibility, WUI, and Control …