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Technical And Scale Efficiency Of Public Hospitals In Papua New Guinea, James Noah
Technical And Scale Efficiency Of Public Hospitals In Papua New Guinea, James Noah
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective of the study was to estimate the relative technical efficiency of public hospitals in PNG and estimate the magnitudes of output increases and/or input reductions that would have been required to make relatively inefficient hospitals more efficient using Data Envelopment Analysis for 20 hospitals in PNG using the data for 2017. The study is further extended using the Tobit regression analysis to investigate the institutional and contextual factors on hospital efficiencies. The results of the output-oriented DEA BCC Model indicated that the average constant returns to scale technical efficiency score was 79%; the average variable returns to scale …
A Model Of Willingness To Communicate In English In Iranian Efl Classroom Context, Azadeh Amirzadi
A Model Of Willingness To Communicate In English In Iranian Efl Classroom Context, Azadeh Amirzadi
Chulalongkorn University Theses and Dissertations (Chula ETD)
The present study aimed to investigate the relationships between WTC in English in classroom context and four trait-like variables: L2 confidence, L2 motivation, L2 anxiety and grit, to propose a WTC model in EFL classroom setting in Iran, and to identify the best predicting variable of WTC in English. The participants were 488 non-English majored university students in two public and two private universities in Iran. The research instrument used in this study was an online questionnaire. The structural equation modeling (SEM) using Amos was conducted to analyze the data. The key findings are as follows. First, positive relationships were …
Effects Of Interleaved Form-Focused English Instruction On Thai Lower Secondary School Students' Grammatical Knowledge And Perception Towards The Instruction, Narongchai Rungwichitsin
Effects Of Interleaved Form-Focused English Instruction On Thai Lower Secondary School Students' Grammatical Knowledge And Perception Towards The Instruction, Narongchai Rungwichitsin
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigated the effects of interleaved form-focused instruction (FFI) on Thai lower secondary students' grammatical knowledge, long-term retention, and their perception towards the instruction. Students took a pre-test, an immediate post-test, and a one-week delayed post-test, and were also interviewed at the end of the implementation. The test scores were to investigate the improvement of grammatical knowledge as well as the long-term retention, and the data from the semi-structured interview were analyzed to figure out the perceptions towards the overall instruction. The results showed significant improvement of grammatical knowledge in all areas of form, meaning, and use and also …
Development Of Phonics Teaching Guideline For Thai Elementary School Students: Lesson Learned From Best Practice Teachers, Wanida Roatchanaphaphong
Development Of Phonics Teaching Guideline For Thai Elementary School Students: Lesson Learned From Best Practice Teachers, Wanida Roatchanaphaphong
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purposes of this research were to 1) develop the phonics teaching guideline to teach phonics and 2) evaluate the quality of the developed phonics teaching guideline to teach phonics. The questionnaires, observations and interviews were used as main collecting procedures. The research instruments consisted of 1) Phonics teaching questionnaire, 2) fieldnotes and interview questions, and 3) Phonic teaching guideline quality evaluation questionnaire. The participants were 5 best practice phonics teachers who were currently working in a school context at the time which were selected by the research instrument Phonics teaching questionnaire. The data were analysed by statistical percentage, qualitative …
Power Loss Minimization With Second Order Cone Programming Relaxation, Akira Chuppawa
Power Loss Minimization With Second Order Cone Programming Relaxation, Akira Chuppawa
Chulalongkorn University Theses and Dissertations (Chula ETD)
The minimization of power loss in distribution systems is very important to increase the reliability and performance of the system. Therefore, this thesis determines power loss minimization in a power system. The active power loss can be minimized by the alternating current optimal power flow (ACOPF) under the limits of power generations, bus voltages, and distribution lines. The general ACOPF problem is computationally intractable in practice owing to the nonlinear objective function and nonlinear constraints. Accordingly, the conventional ACOPF is a nonconvex and NP-hard optimization problem. To address this difficulty, this work develops the computation of the ACOPF by applying …
Electrode Improvement And Neural Network-Based Dynamic Optimization Of Vanadium Redox Flow Battery, Apisada Chutimasakul
Electrode Improvement And Neural Network-Based Dynamic Optimization Of Vanadium Redox Flow Battery, Apisada Chutimasakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
The performance improvement of a vanadium redox flow battery (VRFB) was focused on this study. The two objectives of this study were (1) to investigate the effect of the operating temperatures of the Atmospheric Pressure Plasma jets (APPJs) process on the energy efficiency of the VRFB and (2) to determine the optimal electrolyte flow rate of the VRFB by solving a dynamic optimization based on a neural network model of the VRFB. The APPJs graphite felt electrode treatment temperature providing the highest energy efficiency of the VRFB was 550°C, explained by the Energy Dispersive X-ray Spectrometry (EDX) and X-ray photoelectron …
Measurement Of Reading Literacy, Growth, And Learning Potential Of Grade 9 Students: Application Of Computerized Dynamic Assessment Concept, Yanika Lunrasri
Measurement Of Reading Literacy, Growth, And Learning Potential Of Grade 9 Students: Application Of Computerized Dynamic Assessment Concept, Yanika Lunrasri
Chulalongkorn University Theses and Dissertations (Chula ETD)
The aims of this research were to (1) develop and validate the computerized dynamic assessment for reading literacy and (2) study the effects of different types of prompting of the computerized dynamic assessment on reading literacy, growth of learning, and learning potential. The pilot samples were a total of 802 ninth-grade students in six secondary schools in Bangkok. The data for the main study was gathered from 541 ninth-grade students in eleven secondary schools in Bangkok. A quasi-experimental design was adopted. Research instruments were reading literacy tests for computerized dynamic assessment. The data were analyzed as follows: 1) ANCOVA statistics …
Optimization Model For Chemical Tank Container Management, Atiwich Anantkijthamrong
Optimization Model For Chemical Tank Container Management, Atiwich Anantkijthamrong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Owing to lack of appropriate tool for operational decision, this study aims to develop an optimization model for chemical tank container management using linear programming methodology. The objective function is to maximize net profit while taking container routing, empty container repositioning, and container spot leasing into account as decision variables. The basic constraints used in the model are related to spot demand accommodation and conservation of tank container flows. On top of that, additional repositioning constraints and financial incentives may be utilized to promote empty container repositioning, hence, allow the model to behave alike actual operation. The model results show …
A Robust System For Core Thai Natural Language Processing Technologies, Can Udomcharoenchaikit
A Robust System For Core Thai Natural Language Processing Technologies, Can Udomcharoenchaikit
Chulalongkorn University Theses and Dissertations (Chula ETD)
As the amount of unstructured textual data grows, it becomes increasingly important to build an intelligent system that can process it. Natural Language Processing (NLP) is a technology that allows a computer to exploit human languages to perform tasks. Deep learning models have shown excellent results across fundamental tasks in NLP, such as word segmentation, part-of-speech tagging, and named-entity recognition. However, in many situations, these proposed methods fail to perform well. For an NLP system to be robust, it must address issues such as out-of-vocabulary and spelling-mistakes. This thesis's research goal is to develop NLP models that can handle malformed …
Semi-Supervised Thai Sentence Segmentation Using Local And Distant Word Representations, Chanatip Saetia
Semi-Supervised Thai Sentence Segmentation Using Local And Distant Word Representations, Chanatip Saetia
Chulalongkorn University Theses and Dissertations (Chula ETD)
A sentence is typically treated as the minimal syntactic unit used for extracting valuable information from a longer piece of text. However, in written Thai, there are no explicit sentence markers. We proposed a deep learning model for the task of sentence segmentation that includes three main contributions. First, we integrate n-gram embedding as a local representation to capture word groups near sentence boundaries. Second, to focus on the keywords of dependent clauses, we combine the model with a distant representation obtained from self-attention modules. Finally, due to the scarcity of labeled data, for which annotation is difficult and time-consuming, …
A Model Predictive Control Strategy Based On Predicted Mean Vote For A Building Hvac System, Chanthawit Anuntasethakul
A Model Predictive Control Strategy Based On Predicted Mean Vote For A Building Hvac System, Chanthawit Anuntasethakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis proposes a design of a supervisory model predictive controller for a heating-ventilation-air-conditioning (HVAC) control system. The control objective is to minimize the operating cost and take into account of electrical load shaving and thermal comfort of users. To ensure that thermal comfort is well regulated, we utilize the Predicted Mean Vote (PMV) as an indicator and determine an acceptable bound of a desired set-point temperature. The control design consists of two layers, namely, a supervisory control (SC) layer and a model predictive control (MPC) layer. For the SC layer, we explore a configuration including the choice of predesign …
A Comparative Simulation Of Glycerol Steam Reforming With Foam And Conventional Pellet Catalysts In Packed Bed Reactor, Chattharika Phitchayakorn
A Comparative Simulation Of Glycerol Steam Reforming With Foam And Conventional Pellet Catalysts In Packed Bed Reactor, Chattharika Phitchayakorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aimed to study the effect of different catalyst structures to the hydrogen production process with glycerol steam reforming in packed bed reactors via the COMSOL Multiphysics program. 2D pseudo-homogeneous steady-state model of a 6-inch diameter adiabatic reactor has been developed to describe a transport phenomenon inside the packed bed reactors with two different catalyst structures of conventional 1-inch pellet catalyst and 10-30PPI foam catalyst. The simulated results show that the novel foam catalyst improved the process performance in terms of pressure drop and hydrogen yield comparing to the conventional 1-inch pellet catalyst. The reactor packed with the conventional …
Optimal Sizing Of Battery Energy Storage System With Rooftop Pv Generation System, Chawin Prapanukool
Optimal Sizing Of Battery Energy Storage System With Rooftop Pv Generation System, Chawin Prapanukool
Chulalongkorn University Theses and Dissertations (Chula ETD)
With a significant growth of the rooftop photovoltaic systems (PVs) under the behind-the-meter scheme (BTMS), the battery energy storage systems (BESS) have been developed to enhance the performance of rooftop PVs in many aspects, especially the electricity charge savings. The BTMS can be typically classified into three schemes of self-consumption scheme, net-metering scheme, and net-billing scheme. Other than these schemes, the solar power purchase agreement (SPPA) has been developed to be one the most attractive business models. The SPPA is the scheme where the investors propose to directly sell an electricity from rooftop PVs with BESS to the customers without …
Deep Sequential Real Estate Recommendation Approach For Solving Item Cold Start Problem, Jirut Polohakul
Deep Sequential Real Estate Recommendation Approach For Solving Item Cold Start Problem, Jirut Polohakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
The item cold-start problem occurs when a recommendation system cannot recommend new items owing to record deficiencies and new listing omissions. When searching for real estate, users can register a concurrent interest in recent and prior projects. Thus, an approach to recommend cold-start and warm-start items simultaneously must be determined. Furthermore, unrequired membership and stop-by behavior cause real estate recommendations to have many cold-start and new users. This characteristic encourages the use of a content-based approach and a session-based recommendation system. Herein, we propose a real estate recommendation approach for solving the item cold-start problem with acceptable warm-start item recommendations …
A Morphable Fpga Soft Processor Using Llvm Infrastructure Targeting Low-Power Application-Specific Embedded Systems, Ehsan Ali
Chulalongkorn University Theses and Dissertations (Chula ETD)
The reconfigurable computing (RC) aims to combine the flexibility of General-Purpose Processor (GPP) with performance of Application Specific Integrated Circuits (ASIC). There are several architectures proposed since RC's inception in 1960s, but all have failed to become mainstream. The main factor preventing RC to become common practice is its requirement for implementers of algorithms (programmers) to be familiar with hardware design. In RC, a hardened processor cooperates with a dynamic reconfigurable Hardware Accelerator (HA) which is implemented on Field-Programmable Gate Array (FPGA). The HA implements crucial software kernel on hardware to increase performance and its design demands digital circuit expertise. …
A Real Estate Valuation Model Using Boosted Feature Selection, Kankawee Chanasit
A Real Estate Valuation Model Using Boosted Feature Selection, Kankawee Chanasit
Chulalongkorn University Theses and Dissertations (Chula ETD)
To estimate real estate values, a complex valuation model based on artificial neural network (ANN) has been established as a successful means in modern machine learning research, specifically when high-dimensional data are available. Unfortunately, the real estate data in many locations, such as Thailand, are quite limited in terms of features. Hence, it becomes mandatory to reduce the complexity using feature selection techniques. These techniques aim to improve performance by identifying significant factors and help decrease the computational overload and model construction. However, due to the lack of explicability and interpretability in ANNs, the analysis of input factors cannot be …
Explainable Stock Price Prediction Using Technical Indicators With Short Thai Textual Information, Kittisak Prachyachuwong
Explainable Stock Price Prediction Using Technical Indicators With Short Thai Textual Information, Kittisak Prachyachuwong
Chulalongkorn University Theses and Dissertations (Chula ETD)
A stock trend prediction has been in the spotlight from the past to the present. Fortunately, there is an enormous amount of information available nowadays. There were prior attempts that have tried to forecast the trend using textual information; however, it can be further improved since they relied on fixed word embedding, and it depends on the sentiment of the whole market. In this paper, we propose a deep learning model to predict the Thailand Futures Exchange (TFEX) with the ability to analyze both numerical and textual information. We have used Thai economic news headlines from various online sources. To …
Determining The Effectiveness Of The Health-Edrm Framework And Twitter Data Analysis As The Near Real-Time Source Of Information During The Covid-19 Situation, Kumpol Saengtabtim
Determining The Effectiveness Of The Health-Edrm Framework And Twitter Data Analysis As The Near Real-Time Source Of Information During The Covid-19 Situation, Kumpol Saengtabtim
Chulalongkorn University Theses and Dissertations (Chula ETD)
Coronavirus pandemic or COVID-19 pandemic is considered to be one of the most severe disasters that affect both lives and economics to all the countries around the world. Health Emergency and Disaster Risk Management Framework or HEALTH-EDRM framework is the disaster management framework established in late 2019. One objective of this framework is to reduce the impact of the disaster that affects the lives of the people. Risk communication which is considered as the main function of this framework is also the main key for reducing the amount of affecting people. In this research, the analysis of the effectiveness of …
Manufacturing Cost Reduction In A Filling Process Of Aerosol Products, Nattagun Charoenbunsupkarn
Manufacturing Cost Reduction In A Filling Process Of Aerosol Products, Nattagun Charoenbunsupkarn
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research focuses on the development of heuristics that help reduce the production cost of an aerosol filling process of a case study company, while satisfying all related constraints, including production capacity and due dates. The proposed heuristics are a two-phase one, where the initial solutions are first constructed based on simple dispatching rules, and, once completed, such solution is then iteratively improved by two different improvement heuristics, namely 2OPT and Node Shift. A tabu list is also embedded within such a framework to help reduce its computational time. We have assessed the performances of these heuristics based on 6 …
Comparative Study Of Gross Split And Cost Recovery Production Sharing Contracts In Indonesia, Mohammad Ubaidillah
Comparative Study Of Gross Split And Cost Recovery Production Sharing Contracts In Indonesia, Mohammad Ubaidillah
Chulalongkorn University Theses and Dissertations (Chula ETD)
In upstream oil and gas business, Indonesian has introduced Production Sharing Contract Cost Recovery (PSC CR) in 1966 and still implementing that fiscal system until nowadays. In January 2017, The Indonesian Minister of Energy and Mineral Resources (MEMR or ESDM) introduce new PSC system called Production Sharing Contract Gross Split (PSC GS) following with three amendments until 2019. Ministries believe this new Fiscal regime can attract more investor to invest Oil & Gas business in Indonesia by delivering three main values which are certainty, efficiency, and simplicity policies. This study evaluates and compares the financial aspect of new Indonesian fiscal …
Detection Of Wagyu Beef Sources With Image Classification Using Convolutional Neural Network, Nattakorn Kointarangkul
Detection Of Wagyu Beef Sources With Image Classification Using Convolutional Neural Network, Nattakorn Kointarangkul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Wagyu beef originated in Japan. However, there are many types of Wagyu beef in the market around the globe. Primary sources include Australia, USA, Canada and the United Kingdom. The authentic Japanese Wagyu is well known for its intense marbling, juicy rich flavor and tenderness. Observing that there are differences in flavor, texture, and quality between distinct sources of Wagyu. This research presents an AI-based approach to identify Wagyu beef sources with image classification. The input images were collected from reliable sources on the internet and augmented with DCGAN. Deep neural networks, CNN, was constructed to detect the marbled fat …
Learning Personally Identifiable Information Transmission In Android Applications By Using Data From Fast Static Code Analysis, Nattanon Wongwiwatchai
Learning Personally Identifiable Information Transmission In Android Applications By Using Data From Fast Static Code Analysis, Nattanon Wongwiwatchai
Chulalongkorn University Theses and Dissertations (Chula ETD)
The ease of use of mobile devices has resulted in a significant increase in the everyday use of mobile applications as well as the amount of personal information stored on devices. Users are becoming more aware of applications' access to their personal information, as well as the risk that these applications may unwittingly transmit Personally Identifiable Information (PII) to third-party servers. There is no simple way to determine whether or not an application transmits PII. If this information could be made available to users before installing new applications, they could weigh the pros and cons of having the risk of …
Using Automatic Speech Recognition To Assess Thai Speech Language Fluency In Montreal Cognitive Assessment (Moca), Pimarn Kantithammakorn
Using Automatic Speech Recognition To Assess Thai Speech Language Fluency In Montreal Cognitive Assessment (Moca), Pimarn Kantithammakorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
The Montreal Cognitive Assessment (MoCA), a widely accepted screening tool for identifying patients with mild cognitive impairment (MCI), includes a language fluency test of verbal functioning where scores are based on the number of unique correct words produced by the test-taker. However, with different languages, it is possible that unique words may be counted differently. This study focuses on Thai as a language that differs from English in its type of word combination. We applied various automatic speech recognition (ASR) techniques to develop an assisted scoring system for the language fluency test of the MoCA with Thai language support. The …
Sop Development For Erp/Software Project Management Of A Consulting Company, Piyanat Viengcome
Sop Development For Erp/Software Project Management Of A Consulting Company, Piyanat Viengcome
Chulalongkorn University Theses and Dissertations (Chula ETD)
Presently, ERP/software consulting company has experienced in information gathering process from users in customer company which lead to insufficient to-be process development and vendor selection process. The unexpected results would be extra budget and high manual workload in organization. The possible root cause is uncleared procedure to proceed the project management in ERP/software implementation. The objective of this research is to develop the standard operating procedure for ERP/software project management of a consulting company concentrated in manufacturing industry in Thailand. The methodology starts with studying of competitors' approach from their websites. The ERP expert interview is the next step, 3 …
Accurate Surface Ultraviolet Radiation Forecasting For Clinical Applications With Deep Neural Network, Raksit Raksasat
Accurate Surface Ultraviolet Radiation Forecasting For Clinical Applications With Deep Neural Network, Raksit Raksasat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Exposure to appropriate doses of UV radiation provides enormously health and medical treatment benefits including psoriasis. Typical hospital-based phototherapy cabinets contain a bunch of artificial lamps, either broad-band (main emission spectrum 280-360 nm, maximum 320 nm), or narrow-band UV B irradiation (main emission spectrum 310-315nm, maximum 311nm). For patients who cannot access phototherapy centers, sun-bathing, or heliotherapy, can be a safe and effective treatment alternative. However, as sunlight contains the full range of UV radiation (290-400 nm), careful sun-bathing supervised by photodermatologist based on accurate UV radiation forecast is vital to minimize potential adverse effects. Here, using 10-year UV radiation …
Evaluation Of Cost, Materials, And Safety Of Flow Battery Technologies For Large Scale Energy Storage, Somya Lekcharoen
Evaluation Of Cost, Materials, And Safety Of Flow Battery Technologies For Large Scale Energy Storage, Somya Lekcharoen
Chulalongkorn University Theses and Dissertations (Chula ETD)
New technologies of flow batteries have been developed but the cost, materials, and safety of each of the technologies are still lacking evaluation such as zinc-based flow batteries, so in this work, the cost, materials, and safety of zinc-based flow batteries including zinc air flow battery, zinc iodine flow battery, zinc iron flow battery, zinc manganese dioxide flow battery and vanadium flow batteries are examined for 12 large scale energy storage applications. This work demonstrated that zinc air flow battery is the most cost-effective because of the lowest cost of investment cost and Levelized cost of storage (LCOS) in all …
A Comparison Of Forecasting Methods For Rotable Spare Parts In A Thai Low-Cost Airline, Supannika Thummathid
A Comparison Of Forecasting Methods For Rotable Spare Parts In A Thai Low-Cost Airline, Supannika Thummathid
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research intents to compare and evaluate 3 different methods for forecasting irregular demand of aircraft spare parts by focusing on Rotable part group of Company A which is the leading low-cost airline in Thailand and operate by Airbus A320 model. Based on the demand classification, it is observed that most of the spare part demands presented an intermittent demand pattern. The forecasting methods Croston's, Holt's Linear and Multi-Layer Perceptron trained with Backpropagation of Neural Network Model are applied on the historical data of 36 Rotable spare parts by dividing into 2 sets which are initialization set period 60 months …
Real-Time Instance Segmentation And Point Cloud Extraction For Japanese Food Using Rgb-D Camera, Suthiwat Yarnchalothorn
Real-Time Instance Segmentation And Point Cloud Extraction For Japanese Food Using Rgb-D Camera, Suthiwat Yarnchalothorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Innovation in technology is playing an important role in the development of food industry, as is indicated by the growing number of food review and food delivery applications. Similarly, it is expected that the process of producing and packaging food itself will become increasingly automated using a robotic system. The shift towards food automation would help ensure quality control of food products and improve production line efficiency. One key enabler for such automated system is the ability to detect and classify food object with great accuracy and speed. In this study, we explore real-time food object segmentation using RGB-D depth …
Med-Asa Smart Task-Volunteer Matching System, Taweesin Wongpinkaew
Med-Asa Smart Task-Volunteer Matching System, Taweesin Wongpinkaew
Chulalongkorn University Theses and Dissertations (Chula ETD)
In the context of healthcare, volunteers play an important role in improving the patient's experience and lowering the operational cost. However, the process which facilitate their management is reported to be problematic. In this thesis, the problems of the current system is explored, and a potential solution of a new IT system is outlined. The system was tested for a duration of 2 month during the COVID-19 outbreak in Thailand. SUS and an in-depth interview was conducted in order to gauge the usability and the effectiveness the system. The time it takes for the volunteers to go through with the …
Analysis Of Mass Transfer Coefficient Of Co2 Absorbed By Two-Component Amine Mixture In A Packed Bed Column, Thanakornkan Limlertchareonwanit
Analysis Of Mass Transfer Coefficient Of Co2 Absorbed By Two-Component Amine Mixture In A Packed Bed Column, Thanakornkan Limlertchareonwanit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Nowadays, coal fired plant has an important role in generating energy all over the world. It affects to greenhouse gases effect (GHGs) and global warming. Carbon dioxide (CO2) is a product of coal combustion that is the amount of number one in the world. However, most of the CO2 usually remove from post-combustion process by chemical absorption which is Monoethanolamine (MEA). Anyway, MEA has a disadvantage such as low CO2 loading and corrosion. Therefore, this study needs to investigate the effect of the mass transfer for a new solvents, 2-(Methylamino)ethanol (2-MAE) and Dimethylaminoethanol (DMAE), compensate for the drawbacks of MEA …