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Label-Free Electrochemical Immunosensor For Simultaneous Detection Of Norfloxacin And Enrofloxacin, Kittima Chomthong
Label-Free Electrochemical Immunosensor For Simultaneous Detection Of Norfloxacin And Enrofloxacin, Kittima Chomthong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Electrochemical immunosensors for the simultaneous detection of antibiotics have been of interest and have been reported previously. However, those methods still require difficult labeling for the reporting of electrochemical signals. This research aimed to develop a novel label-free electrochemical immunosensor with an origami paper-based analytical device (oPAD) for the simultaneous detection of quinolone antibiotics. Norfloxacin (Nor) and Enrofloxacin (Enr) are among the quinolone antibiotics, and they are used as models to study antibiotic detection. Nor and Enr antibodies were immobilized separately onto the functionalized oPAD. Thionine and ferrocenecarboxylic acid were coated onto the redox species area to detect Nor and …
Qspr Modelling For Intrinsic Viscosity Of Polymer In Solvents, Benjawan Thananchai
Qspr Modelling For Intrinsic Viscosity Of Polymer In Solvents, Benjawan Thananchai
Chulalongkorn University Theses and Dissertations (Chula ETD)
Intrinsic viscosity, [η], of polymers is an important and valuable measure in polymer study. It can help in revealing molecular weight, size, and branching of polymer chains. In this work, quantitative structure-property relationship (QSPR) models were developed to predict the intrinsic viscosity of polymers in solvents. The database containing 50 polymer-solvent mixtures associated with 8 different polymers was obtained from literature. The solution mixtures were divided into 2 groups, 27 and 23 mixtures in the first (4 polymers) and the second (another 4 polymers) groups, respectively. A total of 1,232 structural properties were calculated. Preliminary screening of descriptors was applied. …
A Feasibility Study On Alternative Printed Labelinspection Methods As Part Of Quality Control Forsmes In Thailand, Chutiwat Thammasiri
A Feasibility Study On Alternative Printed Labelinspection Methods As Part Of Quality Control Forsmes In Thailand, Chutiwat Thammasiri
Chulalongkorn University Theses and Dissertations (Chula ETD)
No abstract provided.
The Impact Of Foreign Direct Investment On Manufacturing Employment : A Comparative Study Of Zhejiang And Other Provinces, Dan Wu
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purpose of this study is to examine the impact of FDI on manufacturing labor productivity in Zhejiang, Jiangsu and Shanghai using panel data between 2007 and 2020. This study investigates the differential effects of FDI in four manufacturing subsectors: Agriculture and Food Industries, Basic Industries, Light Industries and Heavy Industries. First, the empirical result shows that FDI has a significantly positive impact on manufacturing labor productivity in Zhejiang, Jiangsu and Shanghai. FDI has a greater impact on labor productivity in Jiangsu compared to Zhejiang and Shanghai. Second, R&D expenditure has a significant positive effect on labor productivity both in …
A Comparative Country Study Of Outward Fdi Determinants With Special References Of Singapore, Malaysia And Thailand, Penporn Pathong
A Comparative Country Study Of Outward Fdi Determinants With Special References Of Singapore, Malaysia And Thailand, Penporn Pathong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Over the last decade, ASEAN outward FDI increased significantly despite being major recipients of FDI. Singapore, Malaysia, and Thailand have developed into an emerging investment source for many countries. Our study uses panel data analysis covering the period 2005–2019 to investigate and compare their determinants in order to draw policy implications. The results show that common factor that influence outward FDI of the above three countries are technology and geographic distance. Specific factors that influence outward FDI of individual countries differently are GDP, exchange rate, inflation rate, labor cost, export, import and political stability. For policies implication government can encourage …
Three Essays On Trade Costs And Firm Exports, Sunil Kumar Dash
Three Essays On Trade Costs And Firm Exports, Sunil Kumar Dash
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis consists of three separate and self-contained individual studies on trade costs and firm exports. According to the new “new trade theory” where trading firms are heterogeneous, only a few firms can export, while others cannot. The main tenet of the new “new trade theory” is that differences in export participation among firms can be explained by a combination of (1) fixed (sunk) costs of exporting and (2) heterogeneity in the firm characteristics (in terms of size or costs). The goal of the study is to analyze the behavior of firms in international trade while putting “firm heterogeneity” - …
Essays On Physical Health, Mental Health, And Health Behaviors, Liyuan Yang
Essays On Physical Health, Mental Health, And Health Behaviors, Liyuan Yang
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis examines the impact of mental health on physical health and specific health behaviors in Australia. Chapter 2 draws nationally representative panel data from the Household, Income and Labor Dynamics in Australia (HILDA) survey and applies a fixed-effects instrumental variable (FE-IV) approach to address the potential endogeneity of mental health. The analysis reveals that mental health positively affects physical health and plays a substantial role in explaining physical health compared to other covariates. To explore additional benefits of having better mental health, Chapter 3 investigates whether mental health can influence smoking behavior. The results indicate that improved mental health …
An Empirical Study Of Interactivity And Companionship Influencing The Reward Of Game Streamers In Douyu, Mu Zhou
Chulalongkorn University Theses and Dissertations (Chula ETD)
The 'streamer' is a new freelancer in the online gaming industry. In this paper, we obtained data for 46 game streamers on Douyu platform and using panel data two-way FE regression we found that: (1) streamers who have more companionship to viewers earned more reward income; (2) the more bullets they got, the more reward income they earned. Especially for head streamers, the ability to get bullets has a positive impact on earning reward income than that of non-head streamers. The results of the study provide more empirical support for the impact of streamer decision-making and rewarding behavior, and provide …
Effects Of Social Activities On Labor Participation Among Middle-Aged And Older Adults In China, Shixun Yuan
Effects Of Social Activities On Labor Participation Among Middle-Aged And Older Adults In China, Shixun Yuan
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper empirically explores how social activities affect the labor force participation of middle-aged and older adults using data from the 2018 China Health and Retirement Longitudinal Study (CHARLS). Based on 2SLS and IV-probit regression analyses, where social participation is endogenized, there are three key discoveries. First, social activity is negatively associated with labor force involvement and, when instrumental variables are used to minimize endogeneity bias, the negative effect of social participation is found to be stronger. Second, helping others is the only form of social participation that is positively related to labor participation. Finally, the effect of social engagement …
Returns To Higher Education In Urban And Rural Regions In China (2010-2020), Weixuan Zhang
Returns To Higher Education In Urban And Rural Regions In China (2010-2020), Weixuan Zhang
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purpose of this research is to shed light on the impact of different educational paths on the entire wage distribution in rural and urban areas in China from 2010 to 2020. The thesis employed the quantile regression (QR) method using the dataset from the China Family Panel Survey. The OLS regression results reveal a positive correlation between years of education and wages, with each additional year of education associated with a 7.1 percent increase in wages. However, QR and instrumental variable QR results show a diminishing trend in the return to education across income deciles, indicating declining marginal returns …
Returns To Education In Different Industries Of Thailand, Thayatham Sombooncharoen
Returns To Education In Different Industries Of Thailand, Thayatham Sombooncharoen
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research focuses on the analysis of the current state of the labor market by computing returns on education across industry and sub-industries levels. The main goal is to find if there are differences in returns between different types of education attainment. The research used the Labor Force Survey from 2012, 2014, 2015, 2016, 2017, and 2019 with the extended Mincerian method. The Mincerian method is the most popular method used by labor economists globally to find returns to education. This research restricts those working 30 hours or more per week. Furthermore, the data was also restricted to all types …
The Effect Of Chinese Foreign Direct Investment On Economic Growth In Belt And Road Initiative Countries, Rui Tang
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aims to analyze the effect of Chinese foreign direct investment (FDI) and economic growth in Belt and Road Initiative (BRI) countries, taking into consideration the interaction effect of human capital and the mediating role of transport infrastructure. The findings, which use fixed effect models on data from 110 BRI countries from 2003 to 2020, provide evidence that Chinese FDI has a significant positive effect on BRI countries’ economic growth. In terms of human capital, countries with relatively low level of education do not gain additional benefits from FDI-human capital interaction. Furthermore, the indirect effect of Chinese FDI on …
Impacts Of The Social Media On Thailand's Tourism Industry: Impacts Of User-Generated Contents In The Social Media On Tourists' Behavior And Motivations, Shu Jin
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study explores the significant transformation of the global tourism industry in today's digital era, especially for prominent tourist destinations like Thailand, due to social media. As one of Thailand's primary sources of revenue, the tourism industry has embraced social media as a major channel for information dissemination, shaping travelers' experiences and behaviors. The traditional methods of promotion and information delivery are evolving, particularly in the wake of the COVID-19 pandemic, where tourism recovery efforts focus on digital marketing and social media interaction to attract and retain travelers. The increased usage of social media platforms such as Facebook, YouTube, Twitter, …
Receptive Music Therapy For College Students In Mainland China: A Scoping Review, Peiyao Che
Receptive Music Therapy For College Students In Mainland China: A Scoping Review, Peiyao Che
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Receptive music therapy can help Chinese college students increase positive emotions and improve mental health. Purpose: The purpose of this review was to examine the existing literature and to analyze the main features of studies of receptive music therapy for college students in mainland China. We considered the main features of studies of receptive music therapy for college students in mainland China, the objectives used in conducting the intervention, we considered the main features of studies of receptive music therapy for college students in mainland China, the goals used to conduct the interventions, the interventions, and the authors' background. …
Overview Of Music Therapy Intervention For Mothers Of Nicu Babies: A Scoping Review, Narada Buthsuwan
Overview Of Music Therapy Intervention For Mothers Of Nicu Babies: A Scoping Review, Narada Buthsuwan
Chulalongkorn University Theses and Dissertations (Chula ETD)
Mothers of babies in the Neonatal Intensive Care Unit (NICU) often experience various emotional and physical challenges due to the stress from watching their beloved infants suffer and recovering from childbirth. Consequently, they are also considered one of the primary recipients of care, not only because they themselves are recovering but also because a mother's well-being can impact the well-being of NICU infant. Music therapy is recognized as a valuable service that can effectively to support maternal well-being. Some studies have explored the impact of music therapy on NICU mothers, there remains a need for a comprehensive review in this …
Moken Engagement With Tourism In The Surin Islands, Robert Louis Brandon Jr
Moken Engagement With Tourism In The Surin Islands, Robert Louis Brandon Jr
Chulalongkorn University Theses and Dissertations (Chula ETD)
The Andaman coast is home to the Moken who are traditionally sea nomads. In Thailand, they have undergone changes to their traditional life as they deal with the state policy and the tourism industry, where they contend with obstacles to their wellbeing as a people via marginalization and insecurity. This research paper focuses on the situation in the Surin Islands, a national park since 1981 and home to the Moken Village with around 300 residents. The residents receive hundreds of tourists daily, and this paper describes the engagement between Moken and visiting tourists. The researcher gathered data from field observation …
Effects Of Soluble Dietary Fibers On Encapsulation Of Betacyanin Extract From Red Dragon Fruit Peel (Hylocereus Polyrhizus) As Functional Natural Food Colorant, Rahmat Widianto
Chulalongkorn University Theses and Dissertations (Chula ETD)
Betacyanins are bioactive pigments found in red dragon fruit peels with potential health benefits, but low stability and bioaccessibility. This study aimed to investigate the impact of using dietary fibers inulin (IN) and pectin (PE) combined with maltodextrin (MD) as wall materials for betacyanin encapsulation on its physicochemical properties, storage stability, and in vitro release behavior. Various concentrations were tested: 30% MD + 10% IN, 20% MD + 20% IN, 10% MD + 30% IN, 39% MD+ 1% PE, 38% MD + 2% PE, 37% MD + 3% PE, and 40% MD (control). Results showed encapsulation improved physicochemical properties, storage …
Extraction Of Bioactive Compounds From Tamarind Seed Using Ultrasound And Its Encapsulation By Spray Drying Technique, Shivansh Honarao
Extraction Of Bioactive Compounds From Tamarind Seed Using Ultrasound And Its Encapsulation By Spray Drying Technique, Shivansh Honarao
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective of this study was to optimize the ultrasound-assisted extraction (UAE) conditions for tamarind seed extract (TSE) using response surface methodology (RSM). Subsequently, microcapsules were produced via spray drying using various wall materials and ratios. The extraction conditions were temperature levels (30, 40, and 50 °C), exposure periods (5, 10, and 15 minutes), and ethanol concentrations (30, 40, and 50 % v/v). The optimization criteria focused on maximizing the total phenolic compound, total flavonoid content, and antioxidant activity, assessed using DPPH free radical scavenging and FRAP assays. The optimal UAE conditions identified were 45 °C temperature, 15 minutes extraction …
Intergrated Carbon Dioxide Capture-Conversion By Phthalocyanine-Catalyzed Electrochemical Process, Manatsanan Fangarrom
Intergrated Carbon Dioxide Capture-Conversion By Phthalocyanine-Catalyzed Electrochemical Process, Manatsanan Fangarrom
Chulalongkorn University Theses and Dissertations (Chula ETD)
Carbon dioxide (CO2) is a significant contributor to global warming and climate change. Currently various technologies are available to reduce the CO2 emission. Electrochemical CO2 reduction reaction (CO2RR) in the presence of an appropriate catalyst is a promising approach, but it is limited by ability to scale up the process at reasonable cost. Integrating CO2 capture and conversion into a single process by introducing a CO2-capturing agent in an electrolyte solution used for the CO2RR may help overcome this limitation. This study focused on developing the integrated CO2 capture-conversion by using monoethanolamine (MEA), aminomethyl propanol (AMP) or triethanolamine (TEA) as …
Ultrasonic-Assisted Extraction Of Andrographolide And Bioactive Diterpene Lactones From Andrographis Paniculata, Ayomide Gbadebo
Ultrasonic-Assisted Extraction Of Andrographolide And Bioactive Diterpene Lactones From Andrographis Paniculata, Ayomide Gbadebo
Chulalongkorn University Theses and Dissertations (Chula ETD)
Andrographis paniculata is an herbaceous plant known for its medicinally active diterpene lactones, including andrographolide (AG), neoandrographolide (NAG), 14-deoxy-11,12-didehydroandrographolide (DDHAG), and 14-deoxyandrographolide (DAG). These compounds are typically extracted using polar solvents like methanol and ethanol, yielding ≤4% w/w. This research focused on combining a fairly polar solvent with a highly polar solvent in an ultrasonic-assisted extraction (UAE) process, which is both time and energy efficient. The optimized conditions for the extraction were 40°C, 3 hours, 50% duty cycle, 1:10 solute-solvent ratio using a 6:4 ratio of ethyl acetate to ethanol, and 180W power. Quantitative nuclear magnetic resonance (qNMR) analysis successfully …
Screening For Compounds That Affect Innate Immune Memory In Macrophages, Intan Mukti Pratiwi
Screening For Compounds That Affect Innate Immune Memory In Macrophages, Intan Mukti Pratiwi
Chulalongkorn University Theses and Dissertations (Chula ETD)
Innate immunity, the first line of defense against pathogens, is characterized by a rapid response, limited specificity, and lack of memory for future insults. However, recent evidence indicates that components of innate immunity, such as monocytes, macrophages, and natural killer cells, exhibit memory-like responses, known as trained immunity. Trained immunity involves metabolic reprogramming and epigenetic modifications to regulate the expression of inflammation-related genes. Dysregulation of trained immunity can lead to diseases, making it a novel therapeutic target. In this study, the effects of synthetic saccharides derived from the cell wall of Mycobacterium tuberculosis and synthetic cannabinoids on innate immune memory …
Volatile Compound Profiles In Human Sweat For Stress Screening, Teerada Somphot
Volatile Compound Profiles In Human Sweat For Stress Screening, Teerada Somphot
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aimed to develop an alternative stress assessment method by analyzing sweat volatile compounds, given the limited access to psychiatric evaluations. Sweat samples were collected from the armpits of 44 male firefighters using cotton rods and analyzed for volatile organic compounds (VOCs). The extraction of VOCs utilized headspace solid-phase microextraction (HS-SPME) followed by gas chromatography-mass spectrometry (GC-MS), with identification based on comparing experimental retention indices and mass spectra against the NIST Library database. The results were correlated with perceived stress scores (PSS) from the same 44 firefighters. Significant peaks, chosen for their accuracy and statistical significance, identified potential stress …
Ssvep-Bci In Augmented Reality In Realistic Environment, Bhuwit Chaiyarit
Ssvep-Bci In Augmented Reality In Realistic Environment, Bhuwit Chaiyarit
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates Augmented Reality-based Steady-State Visual Evoked Potentials (AR-SSVEP) in Brain-Computer Interface (BCI) systems, utilizing Extended Filter Bank Canonical Correlation Analysis (Extended-FBCCA) for SSVEP recognition optimization across various frequencies in various scenarios. The 10 Hz stimulus consistently achieves the highest recognition accuracy. Frequency-specific variations at 12 Hz, 13 Hz, and 15 Hz highlight nuanced SSVEP responses. White stimuli yield PC-SSVEP recognition ranging from 68.32% to 81.98%, slightly outperforming AR-SSVEP-Controlled (63.59% to 73.23%). Red stimuli impact AR-SSVEP-Controlled less than PC-SSVEP, with recognition ranges of 68.65% to 76.30% and 67.97% to 76.72%, respectively. Comparisons show a general slight outperformance of PC-SSVEP, …
A Fairness Parameters Selection Method For Convex Fairness-Aware Classification Models, Puvarith Veerabulyarith
A Fairness Parameters Selection Method For Convex Fairness-Aware Classification Models, Puvarith Veerabulyarith
Chulalongkorn University Theses and Dissertations (Chula ETD)
Fairness-aware classification has emerged as a focal point in a wide range of machine learning applications. To address fairness issues such as demographic parity and disparate mistreatment, researchers have developed fair classifiers. A common approach for creating fairness-aware models involves formulating an optimization problem where fairness constraints are incorporated. However, the determination of optimal fairness constraint limits poses a significant challenge. In the first part of this paper, we explore the behavior of the fairness constraint limits on the model loss and the fairness metric. Next, we introduce a method for selecting suitable limits from a set of efficient limits …
Solving Cold Start Problems Of Recommender Systems Using Generative Models, Panjawat Rungtranont
Solving Cold Start Problems Of Recommender Systems Using Generative Models, Panjawat Rungtranont
Chulalongkorn University Theses and Dissertations (Chula ETD)
Recommender systems are essential for enhancing user experiences on digital platforms, but they often struggle with suggesting new items lacking interaction data, known as the cold-start item problem. This study introduces "LLM-search," a novel method combining advanced language models (PaLM-2) with data augmentation techniques to address this challenge. LLM-search analyzes users' interactions to identify new items related to their preferences. It then employs a search engine to find cold items based on these preferences, effectively creating synthetic cold items interaction for training the recommender model. An experiment using the 2018 Amazon review dataset across sports & outdoors, groceries, and electronics …
A High-Dimensional Variable Selection Under Multicollinearity Via Whitening Elastic Net, Naphat Kanjanaphan
A High-Dimensional Variable Selection Under Multicollinearity Via Whitening Elastic Net, Naphat Kanjanaphan
Chulalongkorn University Theses and Dissertations (Chula ETD)
In high-dimensional data research such as genomics data, identifying predictors in highly correlated data poses significant challenges, especially when employing regularization methods. We found WLasso (Whitening Lasso), which effectively handles highly correlated settings by transforming predictors to mitigate correlation and applying generalized Lasso criteria. To ensure fairness in comparison with other regularization methods, we utilize a simplified version of WLasso, retaining its core concept while eliminating the coefficient ranking process. Our aim is to enhance WLasso performance by adapting it to the Generalized Elastic Net framework, resulting in Whitening Elastic Net. Leveraging the transformation process of WLasso, we integrate it …
Binary And Multi-Label Machine Learning Models For Discrete-Time Survival Analysis: A Case Study To Predict Complications And Mortality In Thai Diabetic Patients, Heng Chheang
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this research, we address the issue of predicting complications among Thai diabetic patients, considering the interconnected nature of these complications. Noncommunicable diseases (NCDs) such as Type-I and Type-II diabetes impose a significant global health burden, with major complications such as cardiovascular disease being the leading cause. Early detection of complications is crucial, and survival analysis emerges as a key method for this task. While classical approaches focus on continuous-time survival prediction, the advancement of machine learning has enabled the development of discrete-time survival classification. This thesis conducts a comprehensive analysis of survival prediction for Diabetes-related complications, employing six machine …
How Avoiding Positions During Macroeconomic News Announcement Periods Enhances Gold Trading Strategies, Patipan Piyakulmala
How Avoiding Positions During Macroeconomic News Announcement Periods Enhances Gold Trading Strategies, Patipan Piyakulmala
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper investigates the impact of macroeconomic news announcements on trading performance and evaluates the efficacy of avoiding trades during these periods. The study employs three trading strategies: Exponential Moving Average (EMA), Moving Average Convergence Divergence (MACD), and Momentum, analyzing their performance across eight major news events: Non-Farm Payrolls (NFP), Consumer Price Index (CPI) for the US and China, ISM Manufacturing Index (ISM), Industrial Production (IP) for the US and China, German IFO Business Climate, and EU Interest Rates. Utilizing a multifactor regression model, we assess the return performance of trades avoided during news announcements, incorporating control variables such as …
Underpricing And Overpricing Of Stocks Following Extreme Returns: Evidence Of Thailand, Manasnant Tejahwandee
Underpricing And Overpricing Of Stocks Following Extreme Returns: Evidence Of Thailand, Manasnant Tejahwandee
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates how investors in Thailand's stock market react to extreme losses and gains, focusing on underpricing and overpricing phenomena. The objective is to analyze these market behaviors and trading strategies comprehensively. We employ statistical methods, including the Carhart four-factor model, to assess risk-adjusted performance and explore the effects of capital gains overhang and investor sentiment on stock returns. Our methodology involves forming quintile portfolios based on extreme loss and gain returns, using Winsorizing to handle outliers. We analyze both raw and cumulative returns, comparing stocks with the highest and lowest extreme returns. Additionally, we examine the influence of …
National Elections And Volatility Of Stock Returns, Case Study Of Thailand, Sirawit Triyasuk
National Elections And Volatility Of Stock Returns, Case Study Of Thailand, Sirawit Triyasuk
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study explores how electoral factors, including final week surprises, political donations, pre-election polls, election results, and prime minister vote outcomes, affect the volatility of stocks return which are listed on the Thai Stock Exchange. Employing regression models, it assesses how these elements impact market fluctuations, revealing that unexpected events and significant political contributions during election weeks crucially affect market stability differently. The findings indicate that pre-election polls and political donations significantly contribute to increased market volatility. This suggests that during election periods, heightened political activity and financial contributions can lead to greater uncertainty in financial markets, providing key insights …