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Semi-Supervised Deep Learning With Malignet For Bone Lesion Instance Segmentation Using Bone Scintigraphy, Terapap Apiparakoon
Semi-Supervised Deep Learning With Malignet For Bone Lesion Instance Segmentation Using Bone Scintigraphy, Terapap Apiparakoon
Chulalongkorn University Theses and Dissertations (Chula ETD)
One challenge in applying deep learning to medical imaging is the lack of labeled data. Although large amounts of clinical data are available, acquiring labeled image data is difficult, especially for bone scintigraphy (i.e., 2D bone imaging) images. Bone scintigraphy images are generally noisy, and ground-truth or gold standard information from surgical or pathological reports may not be available. We propose a novel neural network model that can segment abnormal hotspots and classify bone cancer metastases in the chest area in a semi-supervised manner. Our proposed model, called MaligNet, is an instance segmentation model that incorporates ladder networks to harness …
Gui Test Case Prioritization Using Social Network Analysis, Chawannut Maitrikul
Gui Test Case Prioritization Using Social Network Analysis, Chawannut Maitrikul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Graphical User Interfaces (GUIs) has become popular in today software products due to its user-friendly merit. However, GUI tests are costly and suffer explosive test cases. Moreover, software evolution causes the GUIs inevitably changed resulting in harder testing. Regression test has been widely used for GUIs software testing when software changes. It is considered to be the most expensive phase in the software testing process, though. Among several alternatives, the technique of test case prioritization would help identify the reduced set of test cases in the regression testing suite, still maintain the same criteria as the original number of test …
Projection And Determinants Of Cognitive Ability Among Older Persons In Thailand : Role Of Education, Paolo Miguel Vicerra
Projection And Determinants Of Cognitive Ability Among Older Persons In Thailand : Role Of Education, Paolo Miguel Vicerra
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis examines the role of education on cognitive ability among the older population of Thailand. The nationally-representative data primarily utilised in this thesis is 2016 Population Change and Well-being in the Context of Aging Society. Other datasets had been used in selected themes within this thesis. Multiple analytic approaches had been applied to this study to show various effects of education gradients on cognitive functioning. In the first study, education and other covariates including income, health status, living arrangement, and social participation among others had been analysed by gender to test if the significant factors would be similar. It …
The Roles Of Informality And Labor Mismatch On Returns To Education In Thailand, Tanthaka Vivatsurakit
The Roles Of Informality And Labor Mismatch On Returns To Education In Thailand, Tanthaka Vivatsurakit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Thailand has experienced rapid economic development and significant investments in education. Despite these trends, many Thai workers remain informally employed or cannot find jobs commensurate with their education level or university major in the labor market. Given these issues, this dissertation examines three interrelated questions: 1) What are the returns to education among the informally employed in Thailand? 2) What is the incidence of vertical education - occupation mismatch and its accompanying wage penalties among Thailand’s informally employed? 3) What is the incidence of horizontal degree field - occupation mismatch and its penalties among Thailand’s post-secondary school graduates? The first …
Grid-Friendly Dispatch Strategy Of Pv Generation System With Battery Energy Storage, Sarute Srisontisuk
Grid-Friendly Dispatch Strategy Of Pv Generation System With Battery Energy Storage, Sarute Srisontisuk
Chulalongkorn University Theses and Dissertations (Chula ETD)
High PV penetration reduces stability tolerance due to the lower of system inertia and system ramp capability. To handle higher PV penetration issues, the system operator and PV owners should consider the operation improvement. For the system operator, critical system ramp capability with respect to PV penetration ratio can be useful to determine the lower bound of system ramp capability for handling N-1 contingency and expected disturbances. In the case study, test results reveal that the system can operate securely with PV penetration ratio up to 40%, in which it will require system ramp capability in the range of 0.05-0.09 …
Influence Of Curved Root Canal On Retreatment Efficacy Of Bioceramic Sealer, Kasemsun Sujaritwanit
Influence Of Curved Root Canal On Retreatment Efficacy Of Bioceramic Sealer, Kasemsun Sujaritwanit
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study evaluated the influence of a curved root canal on the retreatment efficacy of root canals sealed with bioceramic sealer. 60 mandibular molars were divided into 4 subgroups of severely curved canal filled with AH Plus, slightly curved canal filled with AH Plus, severely curved canal filled with BioRoot RCS and slightly curved canal filled with BioRoot. Two weeks after root canal obturation, retreatment was performed with WaveOne Gold Primary and ProTaper Next X3 following with passive ultrasonic irrigation. The retreatment efficacy parameters were regaining canal patency, retreatment time and residual filling material. MicroCT and confocal microscope were used …
Decision Support System For Supplier Selection In Gas Pipeline Industry, Kawinkorn Ampornmaha
Decision Support System For Supplier Selection In Gas Pipeline Industry, Kawinkorn Ampornmaha
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective of this research was to study and analyse both the quantitative and qualitative decision criteria for pipeline fabrication supplier selection in the gas pipeline industry in Rayong, Thailand. The decision-making process was analysed by the Analytic Hierarchy Process technique or AHP and computed using SpiceLogic software. The data collection was carried out by providing questionnaires to experts and specialists at the management level. It was found that the main factors were quality, technical capability, delivery, cost and financial stability. All the main factors were considered with the decision-making process for purchasing and selecting with the best supplier. The …
Strategic Supplier Selection:The Case Of International Food Trading Company, Natchanok Paramaporn
Strategic Supplier Selection:The Case Of International Food Trading Company, Natchanok Paramaporn
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective of the research project is to develop strategic supplier selection system for an international food trading company using the Analytic Hierarchy Process (AHP). The products involved are canned food for worldwide export. The decision makers consist of a president and two marketing managers. The chosen decision criteria listed by weight of important are ‘Export Capability’ (54%), ’Pricing Policy’ (28%), ‘Technological Catch-up’ (10%), ‘Ethical Practices’ (5%), and ‘Environmental Management’ (3%). The sub-criteria chosen are ‘Number of Food Safety Certificate’ (54%), ‘Net Selling Price’ (23%), ‘Automation in Production Process’ (8%), ‘Payment Terms’ (5%), ‘Worker’s Safety and Health’ (4%), ‘Adverse Weather …
Preventive Measures For Project Schedule Control Of Combined Cycle Gas Turbine Power Plant, Pakorn Prabhawong
Preventive Measures For Project Schedule Control Of Combined Cycle Gas Turbine Power Plant, Pakorn Prabhawong
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objectives of this research are to analyse the construction critical paths of the combined cycle gas turbine power plant projects and to determine the delay preventive measures for project schedule control. First, the planned and actual construction schedules of the combined cycle gas turbine power plants have been studied and analysed to see their critical paths and also the near-critical path which could potentially become critical. Construction schedules of four power plants constructed in Thailand have been obtained and analysed. Their capacities and main equipment arrangement are summarized in Chapter 5.1. The common work breakdown structures have been set …
Big Data Analytics For Improving Customer Win-Back Rate In Townhome Segment, Warot Lilahajiva
Big Data Analytics For Improving Customer Win-Back Rate In Townhome Segment, Warot Lilahajiva
Chulalongkorn University Theses and Dissertations (Chula ETD)
Thailand’s real-estate market is now facing with negative growth, where most developers are encountered with challenges in generating satisfactory revenue, particularly from new customers. In order to improve the revenue stream, customer win-back approach that focuses on current customers in the sales funnel and re-engages them by offering more attractive residential projects is therefore initiated. In particular, we focus on the development of predictive analytics model that potentially increases customer win-back rate by exploring the current databases, identifying significance for win-back (based on past performance), and testing the resulting predictions via several machine learning algorithms. The proposed method returns a …
Syntactic And Semantic Interpretations Of Control Constructions In British And American Sports News Articles, Abhinan Wongkittiporn
Syntactic And Semantic Interpretations Of Control Constructions In British And American Sports News Articles, Abhinan Wongkittiporn
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study observes control constructions, traditionally known as to- infinitives, null infinitives, and -ing infinitives to examine their occurrence and connection with syntactic functions and semantic interpretations. The data is from sports news articles in British and American English. From previous studies, semantic interpretation and language variation are the reasons for the appearances of most control constructions. However, most previous studies only paid attention to specific types of control constructions, specific verbs and positions (i.e. Verb Phrase complements) in academic and fiction texts. This study observes all types of control constructions. While interpreting the appearance of control constructions in British …
The Effects Of Speaking Instruction Using Differentiated-Flipped Learning Approach On Speaking Ability And Levels Of Willingness To Communicate Of Thai Efl Undergraduates, Kanpajee Rattanasaeng
The Effects Of Speaking Instruction Using Differentiated-Flipped Learning Approach On Speaking Ability And Levels Of Willingness To Communicate Of Thai Efl Undergraduates, Kanpajee Rattanasaeng
Chulalongkorn University Theses and Dissertations (Chula ETD)
The study aim (1) to investigate the effects of speaking instruction using differentiated-flipped learning approach on students’ speaking ability, (2) to examine the effects of speaking instruction using differentiated-flipped learning approach on students’ levels of willingness to communicate, (3) to investigate the relationship between speaking ability and willingness to communicate, and (4) to examine the students’ perceptions toward speaking instruction using differentiated-flipped learning approach. Thirty second to fourth - year undergraduates from the Faculty of Agro-Industry in King Mongkut’s Institute of Technology Ladkrabang were chosen as the sample group. The study was a single group design using quantitative and qualitative …
Development Of Flotation Enhanced Stirred Tank (Fest) Process For Petroleum Hydrocarbons Removal From Drill Cuttings, Marina Phea
Development Of Flotation Enhanced Stirred Tank (Fest) Process For Petroleum Hydrocarbons Removal From Drill Cuttings, Marina Phea
Chulalongkorn University Theses and Dissertations (Chula ETD)
This work aims to develop the treatment process for the removal of total petroleum hydrocarbons (TPH) from DC by using the combination of air floatation and stirring processes, called Flotation Enhanced Stirred Tank (FEST). Initially, stirring, induced air flotation (IAF), and dissolved air flotation (DAF) are individually investigated over DC washing. Afterward, the combination process between “stirring-DAF” and “stirring-IAF-DAF” are continuously observed for finding the better conditions of TPH removal efficiency. To optimize the operational terms of the treatment process, the Design of Experiment (DOE) is applied to design the experimental conditions within the central composite design-response surface methodology (CCD-RSM). …
Heterogeneity In Reactions To Monetary Policy Of Thai Stock Returns, Siraphop Swingthong
Heterogeneity In Reactions To Monetary Policy Of Thai Stock Returns, Siraphop Swingthong
Chulalongkorn University Theses and Dissertations (Chula ETD)
This paper investigates the effect of Thailand and U.S. monetary policy shock on stock market in Thailand for three level; market, industries and firm level from June 2000 to December 2018. In addition, this paper studies which firm characteristic cause the heterogeneity effect of stock and industry return on monetary policy innovation. Structural Vector Error Correction model follows Kim & Roubini (1999) and Ivrendi & Gulogu (2010) is applied to identify monetary policy shock.This paper finds that SET index return is statistically decrease 1.12 percentage point, on average in reaction to one standard deviation of unexpected increase in Thailand monetary …
Development Of Composite Film Coating For Freeze-Dried Fruit Slices, Nichayarach Invichian
Development Of Composite Film Coating For Freeze-Dried Fruit Slices, Nichayarach Invichian
Chulalongkorn University Theses and Dissertations (Chula ETD)
Edible film coating on food before freeze-drying process can be used for food preservation, especially in heat-sensitive food such as fruits and vegetables. Previous studies have been reported that trehalose had the cryoprotective effect and unique properties such as non-reducing sugar and low hygroscopic. However, no research has been conducted on the use of trehalose as film coatings. Therefore, this study aimed to develop a composite film consisting of alginate and trehalose and to evaluate physical properties of freeze-dried fruit slices coated with a composite film. The experiment was designed to prepare a composite film consisting of various concentrations of …
Antimicrobial Effect Against Oral Microbiota After Continuous Use Of Natural Oral Spray Products, Chanon Suwanprapis
Antimicrobial Effect Against Oral Microbiota After Continuous Use Of Natural Oral Spray Products, Chanon Suwanprapis
Chulalongkorn University Theses and Dissertations (Chula ETD)
So far as we know there were several natural extracts possessed antimicrobial activity against oral microbiota. These natural extracts can be used as an alternative to replace chlorhexidine mouthwash which retains unfavorable flavor and also has some adverse effects. However, the antimicrobial activity of the natural extracts in commercial products have never been demonstrated especially in vivo studies. Therefore, the purpose of this study is to investigate the antimicrobial activity of natural oral spray against oral bacteria compared with chlorhexidine mouthwash, and patient satisfaction. Participants had used two types of commercial natural oral spray products, including essential oil and essential …
Heavy Metals In Hair And Nails Of Electronic Waste Dismantling Workers In Buriram, Thailand, Jaruwan Silachan
Heavy Metals In Hair And Nails Of Electronic Waste Dismantling Workers In Buriram, Thailand, Jaruwan Silachan
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aimed to investigate and compare the concentration of eight heavy metals (As, Cd, Cr, Cu, Mn, Ni, Pb, and Zn) in hair and nails of e-waste workers and non-e-waste workers. Hair and nails samples were collected from participants in Daeng Yai sub-district, Ban Mai Chaiyapot district, and Ban Pao sub-district, Puttatisong district, Buriram, Thailand from December 2018 to January 2019. All sampled were digested with nitric acid by microwave digester and the concentration of heavy metals was analyzed by using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The results showed that the concentration of As and Cd in both …
Blood Lead And Cadmium Levels Of E-Waste Dismantling Workers From Inhalation Exposure To Pm2.5 And Pm2.5-10, Buriram, Thailand, Thidarat Sirichai
Blood Lead And Cadmium Levels Of E-Waste Dismantling Workers From Inhalation Exposure To Pm2.5 And Pm2.5-10, Buriram, Thailand, Thidarat Sirichai
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aims to investigate blood lead and cadmium levels in associated with inhalation exposure of Pb and Cd in PM2.5 and PM2.5-10 of the e-waste dismantling workers and non-e-waste dismantling workers in Daeng Yai sub-district, Ban Mai Chaiyapot district, and Ban Pao sub-district, Puttatisong district, Buriram, Thailand, during May to August 2019. Blood samples were collected on the next day after the air sampling. Pb and Cd in blood and air samples were quantitatively analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The mean blood lead levels of e-waste workers from Daeng Yai sub-district, and Ban Pao sub-district, and …
Factors Affecting The Purchase Of Commercial Endowment Insurance For The Chinese Adults, Tiantian Jin
Factors Affecting The Purchase Of Commercial Endowment Insurance For The Chinese Adults, Tiantian Jin
Chulalongkorn University Theses and Dissertations (Chula ETD)
The study aimed to explore factors affecting the purchase of commercial endowment insurance for the Chinese adults. It used secondary data from “China Health and Retirement Longitudinal Study”, this data was based on family and individual who are 45 and over years old with a total of 17,000 individuals in 2015. In this study the percent of people with commercial endowment insurance is 0.93%, while the percent of people without is 99.07% so it used the Binary logistic model. Factors are studied from individual characteristic consists of age, gender, education, health status and income, and family characteristic composes of number …
Offshore Crew Boat Sailing Time Prediction Models, Atiporn Chongterdtoonskul
Offshore Crew Boat Sailing Time Prediction Models, Atiporn Chongterdtoonskul
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this study, the relationship between travelling time of crew boats and the potential related factors was studied to improve prediction model for travelling time calculation. According to lack of data analysis, the existing calculation method had very high forecast error for crew boat’s morning route which is the main route for boat A and boat B. The selected variables were total distance and boat speed as internal factors while using significant wave height, wave direction, wind speed, and wind direction as external factors. 2017-2019 data were used in this analysis by dividing into 2017-2018 as train and validate data. …
Customer Churn Prediction For A Software-As-A-Service Inventory Management Company, Phongsatorn Amornvetchayakul
Customer Churn Prediction For A Software-As-A-Service Inventory Management Company, Phongsatorn Amornvetchayakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis proposes customer churn prediction model for a Software-as-a-Service inventory management company in Thailand. Software-as-a-Service is the fast growing and high market values industry as a new emerging online business. Customer churn is a critical measure for this business. Thus, this thesis focuses on seeking a customer churn prediction model specified for a Software-as-a-Service inventory management company in Thailand which is facing a high churn rate issue. This thesis executes the prediction models with four machine learning algorithms: logistic regression, support vector machine, decision tree and random forest. The results show that the optimized decision tree model is capable …
Improvement Of Forex Pairs Trading Strategy With Machine Learning Algorithms, Ronnachai Jirapongpan
Improvement Of Forex Pairs Trading Strategy With Machine Learning Algorithms, Ronnachai Jirapongpan
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis aims to study machine learning to improve the trading performance of pairs trading strategy. Pairs trading strategy is one of the most well-known algorithm trading developed in the 1980s by a group of scientists and mathematicians. The concept of the pairs trading strategy is to exploit the mispricing of two equities which their prices tend to move in the same manner. When the algorithm captures the mispricing behavior by equations or indicators, traders open a short position on the equity which its price is relatively higher than the equilibrium and open long position of the other equity. If …
Ict Development And Wage Premiums Across Countries, Hongwu Dai
Ict Development And Wage Premiums Across Countries, Hongwu Dai
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examines the effect of ICT on wage premium, by using data from 64 countries during the period 2010–2016. The Fixed Effect Model (FEM) is employed to study the relationship between ICT development and income inequality, by using two dependent variables: the conventional wage premium and wage premiums for ICT-intensive occupation. The main findings are: 1) the wage premium in countries with low levels of ICT development is relatively higher; 2) the development of ICT has a positive relationship with the wage premium; 3) the roles of the three sub-indexes of ICT development are different: ICT access shows a …
Pointwise Dimension Of Archimedean Copulas, Noppawit Yanpaisan
Pointwise Dimension Of Archimedean Copulas, Noppawit Yanpaisan
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this thesis, we introduce the pointwise dimension of a bivariate copula C at (u,v) in [0, 1]2 via its C-volume. This quantity gives a broader view of probability mass distribution than the support of a copula, the smallest closed set on which the whole mass lies. We would like to study some fundamental properties of pointwise dimension, including the equality to pointwise exponent whenever both of them exist. After that, we investigate the behavior of the pointwise dimension of copulas constructed by various methods. In the last part, we compute the pointwise dimension of Archimedean copulas, an important class …
Binomial Characterizations Of Inner Product Spaces, Saranyachakri Roekrit
Binomial Characterizations Of Inner Product Spaces, Saranyachakri Roekrit
Chulalongkorn University Theses and Dissertations (Chula ETD)
We study the sufficient conditions for a normed space to be an inner product space. We found that some characterizations of inner product spaces are in a form [equation] satisfy some algebraic conditions. We then introduce some characterizations of inner product spaces relating to the binomial identity and conclude that a nomed linear space (X,II.II) is an inner product space if there exist positive integers k and m with 2m
Covers For Leo Moser's Worm Problem, Thitipong Kanchai
Covers For Leo Moser's Worm Problem, Thitipong Kanchai
Chulalongkorn University Theses and Dissertations (Chula ETD)
Leo Moser’s worm problem was posted in 1966 stating that “What is the region of the smallest area that can cover every unit are?”. In 2018, N. Ploymaklam and W. Wichiramala illustrated a new cover, which is currently smallest. Their cover was adapted from the cover of R. Norwood and G. Poole. In this work, we modify the region from the work of R. Norwood and G. Poole and the work of N. Ploymaklam and W. Wichiramala. Our regions are modified by changing their upper boundary. However, the regions remain satisfying properties in the work of R. Norwood and G. …
Machine Vision Integrated Three-Dimensional Printing System, Chaiwuth Sithiwichankit
Machine Vision Integrated Three-Dimensional Printing System, Chaiwuth Sithiwichankit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Three-dimensional printing has been a widespread solution of fabricating geometrical customized products. Any 3D printed product is normally fabricated at a position defined with respect to the coordinate system of the corresponding 3D printer. So, the 3D printing cannot be conveniently implemented in some fabricating applications in which fabricating positions are commonly constrained to some physical references, e.g., architecture construction, surface restoration, food decoration, etc. This research aimed to integrate the 3D printing with machine vision, which is vastly used for guiding robotic systems to operate at desirable positions constrained to physical objects. Hence, the 3D printing can be conveniently …
Path Following And Obstacle Avoidance For Autonomous Vehicle Based On Gnss Localization, Kanin Kiataramgul
Path Following And Obstacle Avoidance For Autonomous Vehicle Based On Gnss Localization, Kanin Kiataramgul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Nowadays, many systems, formerly operated by human beings, are now developed to minimize user control effort. One outstanding system that receives close attention is the autonomous driving system. However, several autonomous driving systems that are currently developed utilize expensive sensing devices, e.g., camera and laser scanner. Moreover, these devices cannot be solely employed but a high-performance processing unit is also required. These pricey components result in an expensive system that does not worth to be used in some practical applications. Therefore, this research intends to utilize other low-cost sensing devices so that the final price of the developed system can …
Functional And Transcriptomic Changes In Synergy Of Endotoxin And (1->3)-Β-D-Glucan In Bone Marrow Derived Macrophage From Fc Gamma Receptor Iib Deficient Mice, Jiraphorn Issara-Amphorn
Functional And Transcriptomic Changes In Synergy Of Endotoxin And (1->3)-Β-D-Glucan In Bone Marrow Derived Macrophage From Fc Gamma Receptor Iib Deficient Mice, Jiraphorn Issara-Amphorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Systemic lupus erythematosus (SLE) is an autoimmune disease with a diverse array of clinical symptoms. There are many factors including environmental factors may trigger disease progression. In this study, we investigated the influence of spontaneous gut leakage upon polymicrobial sepsis in Fc gamma receptor IIb deficient (FcgRIIb-/-) mice aged 8 and 40 weeks, as representing asymptomatic and symptomatic lupus, respectively. The spontaneous gut leakage as determined by i) the level of serum FITC-dextran, ii) increased serum endotoxin (LPS), and iii) increased serum (1->3)-b-D-glucan (BG), were demonstrated in symptomatic FcgRIIb-/- mice, but not in asymptomatic group. Moreover, spontaneous gut leakage …
The Role Of Chromatin Structure In Cellular Responses To Bacterial Cytolethal Distending Toxin In Saccharomyces Cerevisiae Model, Siriyod Denmongkholchai
The Role Of Chromatin Structure In Cellular Responses To Bacterial Cytolethal Distending Toxin In Saccharomyces Cerevisiae Model, Siriyod Denmongkholchai
Chulalongkorn University Theses and Dissertations (Chula ETD)
Cytolethal distending toxin subunit B (CdtB) is a DNase I-like bacterial genotoxin that causes DNA damage leading to cell cycle arrest and cell death. Previous reports demonstrated that CdtB has low level of DNase activity in vitro. Besides, a mutation at histone H2B phosphorylation site required for chromatin condensation during apoptosis (S10A) conferred partial resistance to CdtB in Saccharomyces cerevisiae model. Therefore, we hypothesized that chromatin structure may affect CdtB function. In this study, we identified chromatin regulators required for CdtB cytotoxicity in yeast. We found that deletions of certain components of SWR-complex (SWR1, SWC2, SWC5, SWC6, and ARP6), INO80-complex …