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2018

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Classification Of Risk Attitudes From Customer Behavior With Machine Learning, Teeranai Sriparkdee Jan 2018

Classification Of Risk Attitudes From Customer Behavior With Machine Learning, Teeranai Sriparkdee

Chulalongkorn University Theses and Dissertations (Chula ETD)

Every​ product​ and service in​ the market​ has​ its​ characteristic​ which has an impact on a consumer's decision to buy or use them. The risk is a special characteristic of financial products, so in financial product and service design must use risk as a critical factor. On the other hand, the consumer has different attitudes to the risk which can distinguish in 3 categories viz risk aversion, risk neutral and risk seeking. Therefore, knowing risk attitudes of consumer who is the target market is an important key to define marketing strategy such as designing service and product, campaign, and promotion …

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Lightly-Supervised Learning Methods For One-Class Text Classification, Yiping Jin Jan 2018

Lightly-Supervised Learning Methods For One-Class Text Classification, Yiping Jin

Chulalongkorn University Theses and Dissertations (Chula ETD)

This thesis introduces a lightly-supervised learning method to train text classifiers with very little manual labelling effort. We adapt two previous state-of-theart lightly-supervised models, generalized expectation (GE) criteria (Druck et al. (2008)) and multinomial naïve Bayes (MNB) with priors (Settles (2011)) to oneclass classification problem. Users just need to label a handful of keywords for the target category. We also combine the two aforementioned models by letting MNB automatically augment the list of GE constraints. In addition, we ensemble two families of classifiers to improve the accuracy further. We successfully applied our model to a real-world problem of online advertising. …

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A Hotel Hybrid Recommendation Method Based On Context-Driven Using Latent Dirichlet Allocation, Weraphat Nimchaiyanan Jan 2018

A Hotel Hybrid Recommendation Method Based On Context-Driven Using Latent Dirichlet Allocation, Weraphat Nimchaiyanan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Recommender systems play an important role in helping users find items that they want. Normally, ratings are used in content-based filtering (CBF) and collaborative filtering (CF) for recommendation. However, only ratings are not enough for recommendation. Thus, contextual information, context driven and Latent Dirichlet Allocation (LDA) are used to improve recommendation. Also, the context of individual user has changed in the timeline (context-driven). In this work, a hotel hybrid recommendation method (CF+CBF) based on context-driven using LDA is proposed. Firstly, we find missing user ratings of user-hotel rating matrix by applying LDA on user ratings in order to get predicted …

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Socio - Economic Determinants Of Teen Pregnancies In Mozambique, Arnaldo Timoteo Mandlate Jan 2018

Socio - Economic Determinants Of Teen Pregnancies In Mozambique, Arnaldo Timoteo Mandlate

Chulalongkorn University Theses and Dissertations (Chula ETD)

Teen pregnancy is considered a worldwide public health issue. According to United Nations Population Fund (2014), Mozambique was reported to be the country with the highest teen pregnancy rate in the Southern Africa region. From 2011 to 2015, the proportion of pregnant teens rose significantly from 38% to 46% (IMASIDA, 2015). Thereby, it is important to study factors leading to teen pregnancy incidence in order to draw policy recommendations in the issue. Previous studies in Mozambique applied a qualitative approach. This study fills the literature gaps using the binary logistic regression with a national cross- sectional dataset provided by IMASIDA-Demographic …

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Socio-Economic And Demographic Determinants Of Modern Contraceptive Utilization Among Currently Married Women In Myanmar, Kyaw Than Min Jan 2018

Socio-Economic And Demographic Determinants Of Modern Contraceptive Utilization Among Currently Married Women In Myanmar, Kyaw Than Min

Chulalongkorn University Theses and Dissertations (Chula ETD)

The key purpose of this study is to explore socio-economic and demographic characteristics that influence modern contraceptive use of currently married women aged 15-49 in Myanmar. This study is contributing to fill the literature gaps at the national level. Even though there have been a number of studies on modern contraceptive use and family planning in Myanmar, these studies did not represent the whole nation. This study utilizes data from the Myanmar Demographic and Health Survey (MDHS) 2015-16, a national level cross-sectional dataset. Based on the study, the currently married women in this study included 6,597 women in Myanmar, 51 …

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Sex-Composition Of Children And Fertility Desire In Vietnam, Hai Yen Thi Nguyen Jan 2018

Sex-Composition Of Children And Fertility Desire In Vietnam, Hai Yen Thi Nguyen

Chulalongkorn University Theses and Dissertations (Chula ETD)

This thesis aims to investigate whether the variation in sex composition of children can explain the variation of Vietnamese women's fertility desire. Vietnam has experienced rapid fertility decline since the middle of the 20th century but within a broader context of strong cultural norms regarding son preference. Thus, the sex composition of children is one of the key determinants of reproductive behavior within Vietnam. To my knowledge, no previous study has examined the relationship between sex composition of children and women's fertility desires in Vietnam. Using data from the 2014 Vietnam Multiple Indicator Cluster Survey (MICS) I investigate the association …

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Socio Economic Determinants Of Spousal Violence Against Women In Myanmar, Lin Lin Mar Jan 2018

Socio Economic Determinants Of Spousal Violence Against Women In Myanmar, Lin Lin Mar

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, the violence against women by spouses is a hidden social problem embedded in social and cultural norms in Myanmar. However, there are limited numbers of previous studies regarding spousal violence in Myanmar. Some studies utilized a qualitative approach, while some used a quantitative approach in some parts of Myanmar. This study aims to examine whether socioeconomic and demographic factors affecting spousal violence using a quantitative approach to fill the literature gap at the national level. It uses the data from the 2015-16 Myanmar Demographic and Health Survey. The explanatory variables are demographic and socio-economic characteristics of the women, their …

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Direct And Indirect Impacts Of Education On Subjective Well-Being Of Older Persons In Vietnam : Gender Differences, Truc Ngoc Hoang Dang Jan 2018

Direct And Indirect Impacts Of Education On Subjective Well-Being Of Older Persons In Vietnam : Gender Differences, Truc Ngoc Hoang Dang

Chulalongkorn University Theses and Dissertations (Chula ETD)

Vietnam, like many developing countries, is undergoing a rapid pace of population ageing but within a resource limited context. Therefore, understanding the factors that are important to later life well-being has become a key policy issue. Using data from the 2011 Vietnam National Aging Survey, this thesis aims to investigate gender differences in the direct and indirect impacts of education on subjective well-being of older Vietnamese based on four domains: happiness, life satisfaction, loneliness, and depression (N=2,789, including 1,683 females and 1,106 males). The results from path analysis show that those with higher level of education are happier and more …

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Impact Of Migration And Remittances On Children's Human Capital In Cambodia, Vatana Chea Jan 2018

Impact Of Migration And Remittances On Children's Human Capital In Cambodia, Vatana Chea

Chulalongkorn University Theses and Dissertations (Chula ETD)

This dissertation investigates the impacts of migration and remittances on human capital development of left-behind children in Cambodia. It contributes new evidence to a controversial debate in the literature on long-term impacts of migration and of remittances on the children. This is from the perspective of education, health, and consumption in remittance-recipient households compared with those in non-recipient ones. It relies on pooled data from Cambodia Socio-Economic Survey of 2009 and 2014, each of which comprises around 12,000 households in both rural and urban areas across all 25 provinces there. To evaluate the impact on household educational investment, the study …

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Determinants Of Labor Force Participation Among Older Persons In Myanmar, Zaw Min Latt Jan 2018

Determinants Of Labor Force Participation Among Older Persons In Myanmar, Zaw Min Latt

Chulalongkorn University Theses and Dissertations (Chula ETD)

Population ageing is occurring in many parts of the world. Likewise, in Myanmar, population is ageing with a fast acceleration. The government is trying to find ways to improve wellbeing of older persons, and labour force participation is one of the important factors to reduce financial insecurity during old age. This study aims to investigate the situation of labour force participation and to identify the demographic and economic factors that influence the decision making of older people to join the labour force in Myanmar. This study uses dataset from the 2012 Survey of Older Persons in Myanmar which is nationally …

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Development Of Graphene Oxide/Silver Nanocomposite Coating On Niti Alloy For Biomedical Applications, Dinesh Rokaya Jan 2018

Development Of Graphene Oxide/Silver Nanocomposite Coating On Niti Alloy For Biomedical Applications, Dinesh Rokaya

Chulalongkorn University Theses and Dissertations (Chula ETD)

The study aimed to evaluate the surface, mechanical, and biological properties of graphene oxide/silver nanocomposite (GO/Ag) coated NiTi alloy. Substrates were coated using the electrophoretic deposition at 30 V for 1, 5, and 10 min, and were characterized by scanning electron microscope, Raman spectroscopy, energy dispersive spectroscopy, surface profilometer, and atomic fluoroscope force microscopy (AFM). Hardness, modulus of elasticity, and friction were done and surface adhesion was measured from AFM. Biocompatibility testing was done on human gingival fibroblasts using 3-[4,5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide (MTT) assay. Data were analyzed using SPSS 16; One-way ANOVA with post hoc Scheffe Test (P = 0.05). …

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Using N-Alkane As A Proxy To Reconstruct Paleoenvironment In Thale Noi, Phatthalung Province, Assuma Sainakum Jan 2018

Using N-Alkane As A Proxy To Reconstruct Paleoenvironment In Thale Noi, Phatthalung Province, Assuma Sainakum

Chulalongkorn University Theses and Dissertations (Chula ETD)

Normal alkane (n-alkane) is the widely used hydrocarbon proxy for the paleoenvironmental study because of their specific characteristic and resistance to microbial degradation. The n-alkanes from the sediment cores TLN-CP5 and TLN-CP7 from Thale Noi, Phatthalung Province, were analyzed and subsequently compared with those derived from the recent plant samples. The plant samples were taken from mangrove forests, i.e. true mangrove, back mangrove, and mangrove associate, based on the previous study on pollen analysis. The n-alkane distributions, the average chain length (ACL), the carbon preference index (CPI) and the proportion of aquatic components (Paq) were further analyzed in order to …

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Lithological Classification By Deep Learning Algorithm, Worapop Thongsame Jan 2018

Lithological Classification By Deep Learning Algorithm, Worapop Thongsame

Chulalongkorn University Theses and Dissertations (Chula ETD)

Six machine learning algorithms are used to classify subsurface rocks based on fifteen well logging features from four geothermal wells in the Snake River Plain, Idaho, USA. Two experimental designs, single- and multiple-well tests, are developed to determine the most optimal model and hyperparameters. The single-well test randomly assigns the data in each well into 70% for training set, 10% for validation set, and 20% for test set. The multiple-well test combines data from three wells and splits the data in the fourth well into 70% for training set, 10% for validation set, and 20% for test set. Results show …

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How Far From The Train Station Should We Tax? An Empirical Study Based On Value Capture Method, Nanthawat Ouysinprasert Jan 2018

How Far From The Train Station Should We Tax? An Empirical Study Based On Value Capture Method, Nanthawat Ouysinprasert

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research aims to present a way to earn income for the government through the expansion of the property tax base. It basically collects tax from the asset owners that benefit from the increased value in the development of public infrastructure. There are two important objectives: First, the author wants to analyze the economic impact that occurs from the presence of the train station and other relating factors on the value of housing. Second, the author desires to apply the value capture method to create a tax model. The sample group is 511 residential buildings located within a radius of …

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What Would You Do, If I Get More? An Experimental Test On The Consequences Of Envy, Nattawut Hunyek Jan 2018

What Would You Do, If I Get More? An Experimental Test On The Consequences Of Envy, Nattawut Hunyek

Chulalongkorn University Theses and Dissertations (Chula ETD)

Envy is an unpleasant emotion characterised by the feelings of inferiority, hostility, and resentment produced by an awareness of another person or group of persons who enjoy the desired possession which can motivate the envious person in two different paths, destructive (named malicious envy) and competitive (benign envy). This research presents an experimental design which involves real-effort task to study the quantitative difference between both types of envy. The results show that envy may incentivise subject to do both competitive and destructive things to make them feel better after realising their lower position. The self-position and reference agent position are …

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Reactive Power Management In A Distribution System By Photovoltaic Inverter, Akasinh Luangduangsitthideth Jan 2018

Reactive Power Management In A Distribution System By Photovoltaic Inverter, Akasinh Luangduangsitthideth

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays the electrical generation from the solar photovoltaic resource is extensively promoted because of the concern about greenhouse gas emission. A distribution system can be powered by a variety of solar photovoltaic resources, and can be used for various objectives, it can improve voltage profile problems and can reduce real power losses of the upgrading process of transmission and distribution system. However, presence much of the PV system may have detrimental impacts on the operation of the distribution system because of the variation of solar photovoltaic increases. This thesis proposed the optimal reactive power control modes by PV inverters when …

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Coordination Between Central And Local Control Of Photovoltaic Generation System For Controlling Voltage Violation And Unbalance In Distribution Systems, Anuwat Chanhome Jan 2018

Coordination Between Central And Local Control Of Photovoltaic Generation System For Controlling Voltage Violation And Unbalance In Distribution Systems, Anuwat Chanhome

Chulalongkorn University Theses and Dissertations (Chula ETD)

Solar energy is a clean and pollution-free energy. Economic growth has led to increased demand for electricity in many countries, which has encouraged the installation of solar power generation systems, especially in LV distribution system. Households have the potential to install solar power generation systems because the costs of installation and maintenance have been continuously decreased. However, when there are many connected solar power generation systems in LV distribution system, the following problems may occur: (1) Loss of real power generation due to the operation of overvoltage protection of solar power generation systems, especially the ones on downstream nodes and …

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Application Of Model Predictive Control To Traffic Systems With Hierarchical Distributed Control Framework, Jeerapat Jitnaunt Jan 2018

Application Of Model Predictive Control To Traffic Systems With Hierarchical Distributed Control Framework, Jeerapat Jitnaunt

Chulalongkorn University Theses and Dissertations (Chula ETD)

Traffic congestion is one of the chronic problems that degrades an urban traffic sustainable development especially the transport system. It seriously affects the quality of life of many people and becomes a catalyst of an increment of air pollution. If we can improve public infrastructure, logistics, and public transport system, they will reduce traffic congestion problem. This thesis aims to apply model predictive control (MPC) to traffic systems in a framework on hierarchical distributed control. The control structure composes of three layers which are network layer, area layer, and intersection layer. On the network layer and area layer, the control …

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Flexible Optical Fiber Access Networks Using Wavelength Selective Switches, Maung Maung Htwe Jan 2018

Flexible Optical Fiber Access Networks Using Wavelength Selective Switches, Maung Maung Htwe

Chulalongkorn University Theses and Dissertations (Chula ETD)

The optical switching crosstalk is the important considerable issue in the optical fiber communication system, it tends to the signal distortion and decreasing of the system performance. This dissertation research is proposed a guideline to design a flexible fiber to the x (FTTx) system based on wavelength division multiplexing passive optical network (WDM-PON) combining with wavelength selective switches (WSSs). For the system configuration, the 4 wavelengths-10 ONUs system with the data bit rate of 10-Gbps/λ and 40-Gbps/ λ are studied in this dissertation. Moreover, to be active switching, the dynamic wavelength bandwidth allocation (DWBA) controller is used to control WSSs. …

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Design And Implementation Of Medium-Range Outdoor Wireless Mesh Network With Openflow In Raspberry Pie, Soe Ye Htet Jan 2018

Design And Implementation Of Medium-Range Outdoor Wireless Mesh Network With Openflow In Raspberry Pie, Soe Ye Htet

Chulalongkorn University Theses and Dissertations (Chula ETD)

This thesis has designed and implemented the prototype of software-defined wireless mesh network (SDWMN) testbed with in-band control approach for road traffic monitoring system on Phaya Thai road between Rama 1 and Rama 4 roads. Wireless mesh nodes for this outdoor SDWMN testbed are composed of 6 waterproof boxes, 6 Raspberry Pi's, 6 cameras, and 6 power banks and 2 Intel NUC computers. Ad-hoc based IEEE 802.11 WiFi standard is used to send the captured image from Raspberry. Two gateways are installed at the traffic police boxes and two wireless mesh nodes are installed at each crossover bridge on Phaya …

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An Improvement Of Photovoltaic Power Forecasting From Numerical Weather Prediction, Supachai Suksamosorn Jan 2018

An Improvement Of Photovoltaic Power Forecasting From Numerical Weather Prediction, Supachai Suksamosorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

This thesis presents forecasting models for improving the hourly predicted solar power from Numerical Weather Prediction (NWP) in one day horizon. A practical constraint is that the models must provide the predicted solar power before 14.00 hrs daily so that the Short-term Operation Planning Section, Generation Operation Planning Department, Power System Control and Operation Division, Electricity Generating Authority of Thailand can use the prediction to plan dispatching of the next day. Available data used in this research are from two sources: local weather measurements and power meter installed at the top of Electrical Engineering Building, Faculty of Engineering, Chulalongkorn University …

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Effects Of Blood Contamination On Chemical Composition And Ion Releasing Of Calcium Silicate-Based Materials, Nareerat Thanavibu Jan 2018

Effects Of Blood Contamination On Chemical Composition And Ion Releasing Of Calcium Silicate-Based Materials, Nareerat Thanavibu

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study assessed the effects of blood contamination on the chemical composition and ion release of calcium silicate-based materials. ProRoot MTA (WMTA), Biodentine and TotalFill BC RRM putty (TRRM) were investigated. Materials were exposed to blood (blood-contaminated condition) or normal saline (non-blood-contaminated condition) for 24 hours. Three samples of each group were analysed for chemical composition using X-ray diffractometer and an energy-dispersive X-ray spectoscope with a scanning electron microscope after immersed in phosphate-buffered saline for 1, 7, 14 and 28 days. Five samples of each group were used to measure pH and ion release using a pH meter and inductively …

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Effectiveness Of Different Root Canal Disinfection Protocols On The Reduction Of Bacteria In Large Root Canals, Parnwad Sasanakul Jan 2018

Effectiveness Of Different Root Canal Disinfection Protocols On The Reduction Of Bacteria In Large Root Canals, Parnwad Sasanakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Introduction: The aims of this study were to evaluate the effectiveness of disinfection methods and determine the most promising irrigation protocol for regenerative endodontics in teeth with large root canals. Methods: Sterilized root samples with 0.8-mm wide apical foramen (n=94) were prepared from human mandibular premolars. Ninety-two samples were infected with E. faecalis for 21 days and biofilm formation was verified using scanning electron microscopy (n=2). The 90 infected samples were randomly assigned into 9 groups: no intervention (initial), 1.5% NaOCl irrigation (1.5N), 2.5% NaOCl irrigation (2.5N), 1.5N + intermittent passive ultrasonic irrigation (PUI), 1.5N + intermittent canal brushing with …

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Job Design For Manual Fish Processing Process Improvement, Anawat Benjalak Jan 2018

Job Design For Manual Fish Processing Process Improvement, Anawat Benjalak

Chulalongkorn University Theses and Dissertations (Chula ETD)

This paper presents the development and experimental of the Job Design and Ergonomic principles to a local manual fish processing factory in fish trimming, fish de-scaling and fish gutting processes for worker performance improvement. The fish processing factory experimented in this research is in one of the provinces next to the sea in southern Thailand, namely Pattani, where the leading economy industry of this province are seafood processing and manufacturing. However, because most of the local processing factories in this province are still manually processing the aquatic products, they are affected by more stringent regulation of migrant workers implemented by …

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Predictive Survivability Model Of Technological Start-Ups: A Case Study Of Smart Parking, Akshay Nirmal Singh Jan 2018

Predictive Survivability Model Of Technological Start-Ups: A Case Study Of Smart Parking, Akshay Nirmal Singh

Chulalongkorn University Theses and Dissertations (Chula ETD)

The dissertation focuses on analysing pre-existing survivability prediction models that can be applied to new businesses and start-ups. After studying certain popular models and their critical success factors that can be found in successful businesses and are lacking in failed businesses a new prediction model for technological companies will be crafted. Furthermore, a case study of a potential technological start-up company called Smart Parking will be internally and externally analysed with regards to the environment in will be operating in. The analyses of the internal and external environments will help plan and come up with business strategies for Smart Parking. …

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Warehouse Layout Design For A Metal Conduit Manufacturer, Atiyot Pattarakulprasit Jan 2018

Warehouse Layout Design For A Metal Conduit Manufacturer, Atiyot Pattarakulprasit

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, warehouse layout problems become a common problem for every organization, especially in conduit businesses. Finding an appropriate space to store the products, transporting the products in and out of the warehouse or even an effective way of using material-handling, for example, an overhead crane, is the most relevant topics that can cause a lot of costs and time for the organizations. To resolve these problems, the simulation is built to see the consequences of altering the position of conduit in the warehouse. For each layout design in the simulation is built based on the information provided by the conduit …

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Inland Transportation Cost Reduction Of Automotive Service Part Company, Kanokwan Gloyglom Jan 2018

Inland Transportation Cost Reduction Of Automotive Service Part Company, Kanokwan Gloyglom

Chulalongkorn University Theses and Dissertations (Chula ETD)

Regarding company's current situation, the case studied company has been encountered with a large amount of inland transportation cost for both inbound and outbound logistics increasing year by year. This research aims to reduce inland transportation cost for both inbound and outbound logistics operation at process of transporting empty imported container after loading cargos to shipping line and process of transporting empty container from shipping line for exporting purpose by using concept of "container round use system". To conduct container round use system which required many organisations both internal and external to involve, change project management, risk management and resistance …

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Design Of Business Intelligence System For Point-Of-Sales Software In Full-Service Restaurants, Lalida Chunhasomboon Jan 2018

Design Of Business Intelligence System For Point-Of-Sales Software In Full-Service Restaurants, Lalida Chunhasomboon

Chulalongkorn University Theses and Dissertations (Chula ETD)

Small and Medium-sized restaurants are faced with increasing competitions due to the rise of food reviews and food delivery mobile applications which increase accessibility and customer demands. In order to thrive in this competition, restaurant owners seek to know their performance beyond sales number as there are other aspects of restaurant management such as operations efficiency, inventory, and quality of service. However, the current offerings by various POS in the market do not provide such performance measures, making it impossible for owners to know and improve other dimensions of restaurant management. As a result, the case-study company identified the gap …

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Non-Wetting Defective Reduction In Printed Circuit Board Assembly Processes, Nitcha Sangkhapanit Jan 2018

Non-Wetting Defective Reduction In Printed Circuit Board Assembly Processes, Nitcha Sangkhapanit

Chulalongkorn University Theses and Dissertations (Chula ETD)

According to the company's current situation, the case study company has been encountered with a large amount of non-wetting defects within the production process leading to a higher defect rate and cost over a several years. Therefore, this research is aimed to reduce non-wetting defective rate of location L7 on PCBA during Surface Mount Technology (SMT) process by applying Six Sigma DMAIC methodology accompanying with quality control tools and focus on experimental design. There are separated into five significant phases. The first is Define phase, which related to the studying of current process of manufacturing PCBA and also gathering historical …

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Machine Design Improvement For Tuna Flake Filling In Cans, Phirun Reonwajanawong Jan 2018

Machine Design Improvement For Tuna Flake Filling In Cans, Phirun Reonwajanawong

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aims to improve the process of tuna flake filling in cans by developing a minimum viable product (MVP) to test the feasibility of the improvement. It also examines other related prior and subsequent processes to discover possibilities to increase the accuracy and precision of the filling. Experiments have been carried out during the study to determine the most appropriate features of the machine and suitable conditions of incoming material in order to satisfy the filling standard. The result of the study shows that an improvement in the incoming material investigation process is needed to gain more stable size …

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