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Evaluation Of Cadmium Bioaccumulations In Pak Choi Grown By Hydroponics System, Piyachet Jinsart Jan 2021

Evaluation Of Cadmium Bioaccumulations In Pak Choi Grown By Hydroponics System, Piyachet Jinsart

Chulalongkorn University Theses and Dissertations (Chula ETD)

Cadmium is one of the most harmful heavy metals reported to contaminate the food chain and pose a high risk for health, including non-carcinogenic and carcinogenic effects. High levels of cadmium contamination due to industrial effluent discharge have been reported to affect plant growth and productivity, which could be used as a bio-indicator for cadmium bioaccumulation in plants. The utilization of cadmium-contaminated water for vegetable production has been known to increase the health risk for human consumption. Moreover, pH level was known as a factor affecting cadmium solubility and cadmium uptake by plants. However, there is still unknown about critical …

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Investigation Of Copper And Zinc Contaminations In Bioponic Systems Using Chicken Manure Fertilizer, Satja Aksorn Jan 2021

Investigation Of Copper And Zinc Contaminations In Bioponic Systems Using Chicken Manure Fertilizer, Satja Aksorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

The bioponic system is a system that utilizes biological waste as a nutrient-rich source such as chicken manure fertilizer for plant growth integrated with aquaponic. At present, chicken manure fertilizer is contaminated with Cu and Zn may have the potential health effects through vegetable consumption. The objective of this study was to evaluate nitrogen transformation, nitrogen recovery, and plant growth in chicken manure-based bioponics at Cu (50–150 mg/kg) and Zn (200–600 mg/kg) supplementation and investigate the effects of Cu and Zn supplementations on plant bioaccumulation, root microbial community, and dietary health risk. Cu and Zn concentrations were analyzed using inductively …

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Ecological Risk Assessment Of Microplastics And Heavy Metals In Central Industrial Wastewater Treatment Plant, Thamonwan Phuprasert Jan 2021

Ecological Risk Assessment Of Microplastics And Heavy Metals In Central Industrial Wastewater Treatment Plant, Thamonwan Phuprasert

Chulalongkorn University Theses and Dissertations (Chula ETD)

Microplastics become a big concern in environment. Their small particle size can absorb a variety of pollutants from the nearby environment when discharged into the environment, especially heavy metals. Central industrial wastewater treatment plant (WWTP) is an important source of microplastics in the environment. In this study, wastewater and sludge were collected from two industrial estates in Thailand. Wastewater was collected from 4 points i.e., influent, post grit chamber, post aeration tank, and post sedimentation tank while sludge was collected from sludge storage. Concentration of microplastics, heavy metals and heavy metals on microplastics were examined to evaluate ecological risk assessment. …

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Cryptocurrency Trading With Ensemble Machine Learning Algorithm, Siwat Assavakijphanich Jan 2021

Cryptocurrency Trading With Ensemble Machine Learning Algorithm, Siwat Assavakijphanich

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this project, we aimed to use ensemble machine learning algorithms to trade ten cryptocurrencies along with attempting to add more external factors. Cryptocurrency included in this project were Cardano (ADA), Binance Coin (BNB), Bitcoin (BTC), DOGE, DOT, Ethereum (ETH), LINK, Polygon (MATIC), Uniswap (UNI), and Ripple (XRP). Furthermore, ten external factors, which are ten major stock indices, were added to the algorithm. All machine learning algorithms in this project are used to trade for four trading circumstacnes, an 1-hour interval, six-hour interval, daily interval and weekly interval. There are six machine learning models in this project which will be …

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A Study Of Sustainability In The Energy Sector In Myanmar Between 2011 And 2020, Clara Mang Sui Tang Jan 2021

A Study Of Sustainability In The Energy Sector In Myanmar Between 2011 And 2020, Clara Mang Sui Tang

Chulalongkorn University Theses and Dissertations (Chula ETD)

In modern society, energy becomes a life supporting mechanism, as it is not only entangled with the environment pillar of sustainable development, but also inseparably related to the economic and social pillars of society. Taking advantage of a qualitative research method, this study critically examines the level of sustainability of Myanmar’s energy sector between 2011 and 2020, using 2011 as a baseline, by observing three critical components: energy security, environmental considerations in energy production and securing financial health for the sector. Energy security, possessing uninterrupted availability of energy sources at an affordable price, is studied from available macro secondary data …

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Queering The Migrant Experience: Gay Filipino Workers’ Performance Of Gender And Sexual Identities In Bangkok, Hans Kevin Madanguit Jan 2021

Queering The Migrant Experience: Gay Filipino Workers’ Performance Of Gender And Sexual Identities In Bangkok, Hans Kevin Madanguit

Chulalongkorn University Theses and Dissertations (Chula ETD)

The Philippine migration scholarship heavily focuses on heteronormative issues that depict the migrant workers as heterosexuals. Due to this trend, there is a scarcity of studies on overseas Filipino workers who identify as part of the Lesbian, Gay, Bisexual, Transgender, and Queer (LGBTQ+) Community. Hence, this qualitative research focuses on eleven documented Filipino workers in Thailand who are males assigned at birth and identify as gay homosexuals. Individual informal interviews were employed to investigate how they practice their non-normative gender and sexuality, given their multiple yet intersectional social identities in a country with vibrant queer cultures. It also probes the …

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A Study Of Covid-19 Crisis Communication In Myanmar (January 2020-January 2021) : Divergences Between Ministry Of Health And Sports And State Counsellor, Aye Pa Pa Moe Jan 2021

A Study Of Covid-19 Crisis Communication In Myanmar (January 2020-January 2021) : Divergences Between Ministry Of Health And Sports And State Counsellor, Aye Pa Pa Moe

Chulalongkorn University Theses and Dissertations (Chula ETD)

Effective crisis communication is critical in a country like Myanmar, which has a vulnerable population and a newly democratically elected government. During the COVID-19 pandemic, Myanmar's government established multi communication channels to interact directly with its citizens and other actors, including government agencies, allowing for active stakeholder participation in crisis management. The purpose of this research is to identify the Myanmar government's crisis communication strategy in managing the COVID issue at the national level from January 2020 to January 2021. The study will take a three-stage approach to crisis management, with pre-crisis, crisis, and post-crisis stages. It also explored Myanmar's …

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The Karen Diaspora : Transnational Sense Of Belonging And Practices After The 2021 Myanmar Coup, Thinh Mai Phuc Jan 2021

The Karen Diaspora : Transnational Sense Of Belonging And Practices After The 2021 Myanmar Coup, Thinh Mai Phuc

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research examines the Karen diaspora’s transnational sense of belonging, ideological transition and tactics embodied in transnational activities after the 2021 Myanmar military coup. Looking at young Karen people in 5 host countries including the United States, Australia, Canada, Norway and Thailand, it is evident that those people in the diaspora still perceive the notion of homeland and maintain an emotional sense of belonging to their homeland after a long period of resettlement in host countries. In the context of the 2021 coup, those young people have engaged actively in transnational activities with various tactics used both on-site and online. …

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Does South Korea's Melon Chart Ranking Influence K-Pop Artists' Youtube Views?, Farsai Tipsotikul Jan 2021

Does South Korea's Melon Chart Ranking Influence K-Pop Artists' Youtube Views?, Farsai Tipsotikul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Although K-pop has been diffused throughout the world by YouTube and become globalized, artist’s success is still evaluated by their reputation within the domestic market. Amidst the intense competition in the South Korean music industry, it’s inevitable that artists would hope their songs perform well on the domestic chart as it’s a way to gain public attention. Thus, it leads to the question; “Are some artists putting too much stress on the domestic performances when the global market is also an opportunity?”. To answer the question, this study analyzes the data by quantitative approach to examine whether Melon chart ranking, …

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A Comparison Between Integrative And Instrumental Motivation Of Thai-Korean Language Learners, Koravan Teeramatvanit Jan 2021

A Comparison Between Integrative And Instrumental Motivation Of Thai-Korean Language Learners, Koravan Teeramatvanit

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objective of this study is to examine the types of motivation of Thai­-Korean language learners and to find which type of motivation is dominant for Thai people learning Korean language. An online survey conducted between October and November 2021 collected 155 Thai-Korean language learners from two Korean language institutes certified by the Embassy of the Republic of Korea, namely Chiang Mai King Sejong Institute, and King Sejong Institute in Bangkok. For detailed analysis, the responses of 60 students and 95 non­students were further examined, mainly by comparing the mode of their responses. The results reveal that student and non-student …

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The Changing Of South Korea's International Economic Policy: A Geopolitical Economy Perspective, Sahatas Chindakul Jan 2021

The Changing Of South Korea's International Economic Policy: A Geopolitical Economy Perspective, Sahatas Chindakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Since the success of rapid economic growth, South Korea, as a foreign-traded dependent economy, has initiated several policies to liberalize its outward direct investment (ODI) in order to maintain its competitiveness and drive its economic growth. The liberalization process of South Korean ODI helps promote South Korean capital abroad to various areas serving its needs of lowering production costs and securing natural resources and raw materials. As the world entered the 21st century with the acceleration of globalization, the global geopolitical situation has changed over time, especially in Asia, the rise of China has become real and threatens the hegemonic …

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The Motherhood Wage Penalty In The Public And Private Sectors In Thailand, 2017, Qiuge Chen Jan 2021

The Motherhood Wage Penalty In The Public And Private Sectors In Thailand, 2017, Qiuge Chen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Prior research has shown that the Motherhood Wage Penalty on mothers has led to mothers earning a lower monthly income than women without children in Thailand. This paper uses the Social Economic Survey (SES) of 2017 to study how the motherhood penalty affects women from different sectors. Using data of 9522 women from age 15 to 65 in the SES 2017, I find that the average motherhood wage penalty stood at 7.6 percent. The average penalty was 1.6 percent higher in the public sector versus the penalty in the private sector. Human Capital Theory explains the wage gap between mothers …

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The Relationships Between Socio-Economic Background And Youth Not In Education, Employment, Or Training In A Developing Country Context: A Case Study Of Thailand, Wei Liu Jan 2021

The Relationships Between Socio-Economic Background And Youth Not In Education, Employment, Or Training In A Developing Country Context: A Case Study Of Thailand, Wei Liu

Chulalongkorn University Theses and Dissertations (Chula ETD)

This paper explores the relationship between young people aged 15 to 24 who are not in education, employment, or training (NEET) and socio-economic background in Thailand. Using a linear probability model with 16,329 samples with data from 2007 Socio-Economic Survey of Thailand and 12,813 samples with data from the 2017 Socio-Economic Survey of Thailand, I find that the results are sensitive to the definition of NEET used. For NEET status that includes unpaid family workers, I find that in both 2007 and 2017 data, compared to the lowest income group, individuals from household with higher average monthly income per capita …

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Gis Mapping Evaluation Of Stroke Service Areas In Bangkok Using Emergency Medical Services, Kiatirat Sreemongkol Jan 2021

Gis Mapping Evaluation Of Stroke Service Areas In Bangkok Using Emergency Medical Services, Kiatirat Sreemongkol

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, stroke is the leading cause of death in Thailand. Patients must be treated within 4.5 hours from symptom onset to increase recovery rate. Time is therefore a critical factor of the success or failure of the treatments. The objective of this research is to investigate the service coverage of various healthcare centers through current Emergency Medical Services (EMS) in Bangkok. To get service coverages for Stroke in Bangkok, the updated speed of the traffic and the amount of time it takes for each mode of transport for the pre-hospital stroke process are collected and examined using GIS mapping. The …

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Contributing Factors In Aircraft Accidents Triggering Fatalities, Prakayphet Chalayonnawin Jan 2021

Contributing Factors In Aircraft Accidents Triggering Fatalities, Prakayphet Chalayonnawin

Chulalongkorn University Theses and Dissertations (Chula ETD)

Air transport has always been considered the safest way to travel. It has contributed numerous economic and social benefits, for instance, connecting multimodal modes of transportation, increasing employment, driving global and local economic activities, reducing travel time and generating trade, tourism, and services, connecting people and countries, and supporting humanitarian activities in a remote rural area. Historical records on the fatality ratio suggested that air transportation has the highest likelihood of accidents (occurrences with fatalities) when compared to all other transportation modes, including highway, railroad, and water. Then, when an accident occurs, it largely affects various stakeholders. This study aims …

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The Healthcare Information For Patient Referral, Veerawan Aumpanseang Jan 2021

The Healthcare Information For Patient Referral, Veerawan Aumpanseang

Chulalongkorn University Theses and Dissertations (Chula ETD)

Despite the cooperative sharing of Health Information Exchange (HIE), various distinct limitations and barriers are found, i.e., substantial time and resources are being used to achieve health information. This paper aims to investigate the limits of healthcare information sharing policy implementation and assorts the critical and shareable set of relevant healthcare information to patient referral systems in Thailand. Mixed-methods research methodology, both quantitative and qualitative mechanisms are conducted. The study results present the correlation between the current healthcare information exchange among the hospitals in patient referral systems and the limitations of implementing the HIE policy composed of technical, economic, political, …

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Pancyclicity And Vertex Pancyclicity For Some Products Of Graphs, Artchariya Muaengwaeng Jan 2021

Pancyclicity And Vertex Pancyclicity For Some Products Of Graphs, Artchariya Muaengwaeng

Chulalongkorn University Theses and Dissertations (Chula ETD)

No abstract provided.

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Global Analysis Of A Discrete Sirs Epidemic Model With Nonlinear Incidence Rate, Butsayapat Chaihao Jan 2021

Global Analysis Of A Discrete Sirs Epidemic Model With Nonlinear Incidence Rate, Butsayapat Chaihao

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this thesis, we prove some behaviors of a discrete SIRS epidemic model with a nonlinear incidence rate and a distributed time-delay. This model is constructed from the discretization of the corresponding continuous model by using a nonstandard finite difference method. The basic properties including the positivity and the boundedness of the solutions are established. We derive the existence of the disease-free equilibrium and the endemic equilibrium of the model. In addition, by applying Lyapunov function techniques, we prove that the disease-free equilibrium is globally attractive. Moreover, we give a sufficient condition for the permanence of the model. In order …

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Hamiltonian Decompositions Of Hypergraphs, Chutima Saengchampa Jan 2021

Hamiltonian Decompositions Of Hypergraphs, Chutima Saengchampa

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this dissertation, we first discuss four versions of Hamiltonicity in hypergraphs. We mainly study the existence problem of Hamiltonian decompositions of uniform hypergraphs based on two versions of Hamiltonian cycles, so called ``KK-definition" and ``WJ-definition". For KK-definition, we create a recursive construction of KK-Hamiltonian decomposition of complete 3-uniform hypergraphs. Our construction method uses a KK-Hamiltonian decomposition of the complete 3-uniform hypergraph, Kt(3), and some well-known graph decompositions to obtain a KK-Hamiltonian decomposition of the complete t-partite 3-uniform hypergraph, Kt(n)(3), when t=4,8 (mod12), n>=2, as well as a KK-Hamiltonian decomposition of K2t(3). Therefore, together with the current results in …

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Algebraic Degree Of Spectra Of Cayley Hypergraphs, Naparat Sripaisan Jan 2021

Algebraic Degree Of Spectra Of Cayley Hypergraphs, Naparat Sripaisan

Chulalongkorn University Theses and Dissertations (Chula ETD)

No abstract provided.

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Local Limit Theorems For Sums Of Independent Integer-Valued Lattice Random Variables, Punyapat Kammoo Jan 2021

Local Limit Theorems For Sums Of Independent Integer-Valued Lattice Random Variables, Punyapat Kammoo

Chulalongkorn University Theses and Dissertations (Chula ETD)

No abstract provided.

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Hamiltonian Cycles Of Equational Graphs Over Finite Fields, Wachirawit Chaifongsri Jan 2021

Hamiltonian Cycles Of Equational Graphs Over Finite Fields, Wachirawit Chaifongsri

Chulalongkorn University Theses and Dissertations (Chula ETD)

No abstract provided.

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Elastic Bending Behaviour Of Sandwich Composite Structures With Abs Cores By Using Additive Manufacturing, Dechawat Wannarong Jan 2021

Elastic Bending Behaviour Of Sandwich Composite Structures With Abs Cores By Using Additive Manufacturing, Dechawat Wannarong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Maintaining the lightweight performance of sandwich structures while achieving good bending strength and stiffness is difficult. Core materials for these programmable sandwich constructions are 3D printed with hexagonal honeycomb, re-entrant honeycomb, and circular honeycomb topologies with varying core densities. The bending stiffness and strength of these sandwich structures are determined by a three points bending test including an Acrylonitrile Butadiene Styrene core and a unidirectional carbon fibre reinforced polymer face sheet. The sandwich composite with the greater relative core density displays greater bending strength and stiffness than the composite with the lower relative core density. The sandwich composites beam with …

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Effectiveness Of The New Ambulance Air Exhaust System In Reducing Aerosol Particle Concentration, Vasutorn Petrangsan Jan 2021

Effectiveness Of The New Ambulance Air Exhaust System In Reducing Aerosol Particle Concentration, Vasutorn Petrangsan

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objective of this work is to assess the effectiveness in reducing airborne particles of the Camfil® CC410-concealed air exhaust system, that is installed in the ER-1 ambulance (a King Chulalongkorn Memorial Hospital ambulance). This is done by diffusing aerosols into the cabin at the patient’s face position for an injection period (IP) of 1 minute and measuring the aerosol concentration inside the cabin over time. The experiment is conducted for 2 ventilation conditions, when the exhaust system is off (Minimal Ventilation: MV) and at maximum speed (High Ventilation: HV). Density of the aerosol is interpreted in terms of its …

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Development Of Novel Point-Of-Care-Testing For Oxalate Detection In Urine Based On Oxalate-Binding Ligands, Naruerat Joybumrung Jan 2021

Development Of Novel Point-Of-Care-Testing For Oxalate Detection In Urine Based On Oxalate-Binding Ligands, Naruerat Joybumrung

Chulalongkorn University Theses and Dissertations (Chula ETD)

Kidney stone disease is the third most common urinary tract disease worldwide that is more prevalent in the tropics. In Thailand, the highest stone prevalence up to 17% is reported in the Northeast. The disease is highly recurrent with a recurrence rate of about 50% within 5-10 years. The most common type of kidney stones is calcium oxalate (CaOx), and an increased urinary oxalate excretion is an important risk factor. Most of kidney stone patients have a hyperoxaluria condition (urinary oxalate >40 mg/day or >0.46 mmol/day). Therefore, urinary oxalate measurement has been widely used for estimating the risk of CaOx …

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Epigenetic Regulation Of Reactive Oxygen Species-Induced Tumor Progression In Hepatocellular Carcinoma, Suchittra Phoyen Jan 2021

Epigenetic Regulation Of Reactive Oxygen Species-Induced Tumor Progression In Hepatocellular Carcinoma, Suchittra Phoyen

Chulalongkorn University Theses and Dissertations (Chula ETD)

Oxidative stress is a consequence of an imbalance of antioxidants and reactive species. The most common form of reactive species is derived from oxygen, called reactive oxygen species (ROS). ROS involve in pathogenesis of several diseases including cancers. Cancer genesis and progression are contributed through both genetic and epigenetic mechanisms. Histone modification, a post-translational modification at histone tails, is one of the epigenetic mechanisms known to participate in carcinogenesis and tumor progression. Although the ROS-induced histone modification alteration has been demonstrated in some cancers, the change in histone methylation and gene expression by ROS in hepatocellular carcinoma (HCC) is scarcely …

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Integrative Transcriptomic Analysis And Validation Of Non-Coding Rna In Liver Cancers, Varunya Virushkul Jan 2021

Integrative Transcriptomic Analysis And Validation Of Non-Coding Rna In Liver Cancers, Varunya Virushkul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Hepatocellular carcinoma (HCC) and intrahepatic cholangiocarcinoma (iCCA) are the most common and cause cancer-related deaths. Due to the lack of sensitivity and specificity of conventional markers, such as AFP, CA19-9 and CEA. Thus, this study aimed to identify miRNAs as a diagnostic biomarker for HCC and iCCA. First, in discovery set, RNA sequencing and small RNA sequencing data of 992 HCC and adjacent tissues and 116 iCCA and adjacent tissues were downloaded from the GEO database. After that, the lncRNA-miRNA-mRNA network was constructed and analyzed for the differential expression of lncRNA (DElncRNA), miRNA (DEmiRNA), and mRNA (DEmRNA). Then, the significant …

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Development Of A Human Viable Heavy Chain Antibody Against The Alpha Folate Receptor As A Molecule For Targeted Application By Phage Display Technology, Nattihda Parakasikron Jan 2021

Development Of A Human Viable Heavy Chain Antibody Against The Alpha Folate Receptor As A Molecule For Targeted Application By Phage Display Technology, Nattihda Parakasikron

Chulalongkorn University Theses and Dissertations (Chula ETD)

Alpha folate receptor (FRα) is currently under investigation as a target for the treatment of patients with non-small-cell lung cancer (NSCLC), since it is highly expressed in tumor cells but is largely absent in normal tissue. In this study, a novel human variable domain of a heavy-chain (VH) antibody fragment specific to FRα was enriched and selected by phage bio-planning. The positive phage clone (3A102 VH) is specifically bound to FRα and also cross-reacted with FRβ, as tested by ELISA. Clone 3A102 VH was then successfully expressed as a soluble protein in an E. coli shuffle strain. The obtained soluble …

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A Comparative Study Of Gut Microbiota In The Healthy Elderly And The Elderly With Colorectal Cancer, Nutta Iadsee Jan 2021

A Comparative Study Of Gut Microbiota In The Healthy Elderly And The Elderly With Colorectal Cancer, Nutta Iadsee

Chulalongkorn University Theses and Dissertations (Chula ETD)

Colorectal cancer is one of the third most common cancer worldwide. Dysbiosis of the human gut microbiota has been linked to sporadic colorectal cancer (CRC). This study aimed to compare the gut microbiota profile of a total of 80 Thai volunteers, who were above 50 years old, among 25 CRC patients, 33 adenoma patients, and 22 healthy controls (HC). The 16S rRNA sequencing was utilized to characterize the gut microbiome in both mucosal tissue and stool samples. Moreover, absolute quantitative PCR (qPCR) assay was conducted to quantify six CRC-associated bacteria including Fusobacterium nucleatum (FN), Parvimonas micra (PM), colibactin positive strains …

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Comparative Response Of Dendritic Cells To Pathogenic And Non-Pathogenic Leptospira Spp., Pratomporn Krangvichian Jan 2021

Comparative Response Of Dendritic Cells To Pathogenic And Non-Pathogenic Leptospira Spp., Pratomporn Krangvichian

Chulalongkorn University Theses and Dissertations (Chula ETD)

Leptospirosis is a zoonotic disease caused by pathogenic Leptospira species, which consist of three groups and contain 4 subclades: pathogenic strains (P1), intermediate strains (P2), and non-pathogenic strains (S1 and S2). Infection of pathogenic leptospires occurs through contact with contaminated environments. Then, leptospires present in the bloodstream disseminate to target organs. Nowadays, the knowledge of the immune response to pathogenic and non-pathogenic leptospires during early infection is still limited. Due to the limitation of a susceptible host, immunological reagents for hamsters and strains of mice are limited and not available. Dendritic cells are the first cells to encounter leptospires found …

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