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Full-Text Articles in Engineering

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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Inbound Logistics Management For A Pvc Resin Manufacturer, Thunlapas Ruengrapeepun Jan 2018

Inbound Logistics Management For A Pvc Resin Manufacturer, Thunlapas Ruengrapeepun

Chulalongkorn University Theses and Dissertations (Chula ETD)

The main objective of this research is to enhance logistics operation of a Thai PVC manufacturer located in Rayong, where we will focus more on the domestic part involving with three different PVC products, that is, Palletized PVC, Flexible-bag PVC, and Tank car PVC. Based on the historical data collected in 2017, over 90 percent of the complaints was identified as delivery delays caused by comparatively long non-value added activities within the inbound logistics process, such as waiting in weighting-in process and over processing steps in delivery paper generation. In order to address these issues, truck scheduling and throughput time …

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Quality Enhancement Of Shrimp Paste And Packaging Improvement For A Local Manufacturer, Pongsakorn Sornbunjong Jan 2018

Quality Enhancement Of Shrimp Paste And Packaging Improvement For A Local Manufacturer, Pongsakorn Sornbunjong

Chulalongkorn University Theses and Dissertations (Chula ETD)

The present research focuses on the quality of the shrimp paste manufacturing company by emphasizing product quality improvement as well as packaging improvement for the shrimp paste, which is the main product of the Case Study Company. Presently, the product uses paraffin to cover the shrimp paste for food preservation, which is prohibited by Food and Agricultural Organisation of the United Nations ( FAO) / World Health Organisation (WHO) and Thailand's Food and Drug Administration (FDA).
The research procedure may be divided into 3 phases. The first phase consists of improvement to the physical and chemical properties of the shrimp …

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Surface Roughness Improvement For Passenger Car Hood Die Manufacturing Process, Worachet Onngam Jan 2018

Surface Roughness Improvement For Passenger Car Hood Die Manufacturing Process, Worachet Onngam

Chulalongkorn University Theses and Dissertations (Chula ETD)

Surface roughness of a die is a crucial factor for making a high-quality car hood. This research thesis is made for improving die surface quality in die manufacturing process. If the performance of milling process is not enough, it consumes a lot of time for doing polishing and might result in poor die quality that does not meet customer's need. Therefore, the purpose of this research is to improve the CNC milling process. Tools used for milling and all relate parameters are studied in order to figure out the most appropriate condition for the finish milling process. Nowadays, a 1-blade …

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Tio2 Nanoparticles Coated Forward Osmosis Membranes For Treatment Of Industrial Textile Effluent, Kaung Ko Ko Sint Jan 2018

Tio2 Nanoparticles Coated Forward Osmosis Membranes For Treatment Of Industrial Textile Effluent, Kaung Ko Ko Sint

Chulalongkorn University Theses and Dissertations (Chula ETD)

Textile wastewater occur as demanding water bodies to be treated by membrane separation due to the complex composition and presence of reactive constituents such as heavy metals and salts as well as nutrients, e.g. nitrogen, sulphate and phosphate. Numerous combination of osmosis process with photocatalysts has been experimentally conceived for the water and wastewater treatment and reuse of textile wastewater. The present work was devoted to study the operating feasibility using photocatalyst as TiO2 nano-particles were coated onto two commercially available FO membranes, a cellulose triacetate (CTA) membrane and an aquaporin (AqP) membrane through a specially designed 3-(trimethoxysilyl) propyl methacrylate–polymethyl …

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Adsorption And Chemical Cleaning Process Of Anionic And Non-Ionic Surfactants On The Membrane Surface Through The Forward Osmosis Process: Application For Water Reuse, Kaiwit Ruengruehan Jan 2018

Adsorption And Chemical Cleaning Process Of Anionic And Non-Ionic Surfactants On The Membrane Surface Through The Forward Osmosis Process: Application For Water Reuse, Kaiwit Ruengruehan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Forward osmosis (FO) process, an attractive membrane technologies, have been widely studied and applied in many fields to manufacture the clean water. This work, we focused on the fouling behavior and mechanisms of forward osmosis (FO) fouled by sodium dodecyl sulfate (SDS) as anionic surfactants and of nonylphenol ethoxylate (NPE, NP-40) as nonionic surfactant, including cleaning process to recover the system. FO process was run under different operating conditions (cross flow velocity, pH of feed solution, surfactant concentration). In addition, deionized-water (DI), 0.1 M NaCl, and alkaline solution (NaOH) were applied as agents for the cleaning process. The results revealed …

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Roles And Regulation Of The Ai-2 Quorum Sensing Of Vibrio Parahaemolyticus In Nitrification Biofilter Of Shrimp Recirculating System., Monchai Pumkaew Jan 2018

Roles And Regulation Of The Ai-2 Quorum Sensing Of Vibrio Parahaemolyticus In Nitrification Biofilter Of Shrimp Recirculating System., Monchai Pumkaew

Chulalongkorn University Theses and Dissertations (Chula ETD)

Thailand is the largest shrimp producing and exporter among Southeast Asia. Up-to-Date, Recirculating Aquaculture System (RAS) have been developed in order to control water quality and enable to conduct intensive cultivation without limitation of land-based cultivation method. Nevertheless, there is concern about pathogenic contamination in Biofilter. Therefore, the role of biofilter in terms of biosecurity is required to study. Recently, shrimp Early Mortality Syndrome (EMS) as known as AHPND/EMS, has spread to shrimp farm in several areas of Thailand. This contributes to severe productivity losses in the shrimp farm industry. It is evident that the causative agent of AHPND disease …

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Information Provision And Economic Approach For Promotion Of Plastic Shopping Bag Reduction In Bangkok, Thailand., Nattapat Piromrat Jan 2018

Information Provision And Economic Approach For Promotion Of Plastic Shopping Bag Reduction In Bangkok, Thailand., Nattapat Piromrat

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research aims to study the situations of plastic bag management from stakeholders, current plastic bag use trends, evaluate the effect of information provision and estimate the willingness to pay for plastic bag waste management in Bangkok. Online and field questionnaires had been distributed to collect the data. This study found that the trend of plastic bag use is moderate while most of respondents always reuse their plastic bag. Situations of plastic bag management indicate plastic bags are still distributed for free in the market, but some retailers started not to provide them. The plastic bag production is gradually affected …

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Effect Of Operating Conditions On Color And Anions Removal From Textile Industrial Effluent Using Membrane Distillation System, Pyae Phyo Kywe Jan 2018

Effect Of Operating Conditions On Color And Anions Removal From Textile Industrial Effluent Using Membrane Distillation System, Pyae Phyo Kywe

Chulalongkorn University Theses and Dissertations (Chula ETD)

One of the main pollution from textile wastewater is the dyeing wastewater containing color and organic matters. To develop wastewater treatment systems and to reuse the water are still challenged because of the scarcity of water in the world. Among the treatment methods of textile wastewater, membrane distillation was used as the concept of this research. The focus points of the direct contact membrane distillation system are the membrane characteristics, operating parameters (temperature and flow rate) and treatment efficiency. The synthetic dye wastewater (reactive black-5 and reactive blue-19) and real textile effluent were used as the feed wastewater. In this …

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Acclimatization And Application Of Biofilters For Nitrogen Removal In Marine Recirculating Shrimp Culture System, Penpicha Satanwat Jan 2018

Acclimatization And Application Of Biofilters For Nitrogen Removal In Marine Recirculating Shrimp Culture System, Penpicha Satanwat

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research involved in the complete nitrogen removal in marine recirculating aquaculture system (RAS) through sequential nitrification and denitrification processes using internal biofilter within a single tank. The study was divided into two experimental parts. The first study was to estimate the effects of salinity (5, 15 and 25 PSU) and stocking density (50 and 100 shrimp m-2) on nitrification and denitrification efficiencies, as well as on microbial diversity in the biofilm. Also, the nitrogen removal efficiencies of fibrous BiocordTM biofilter and Japanese filter mat were compared. Results showed that the nitrification was stimulated in low-salinity (5 PSU) system with …

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Study Of Gas-Liquid Mass Transfer In Bubble And Spray Column Adding Solid Media, Kritchart Wongwailikhit Jan 2018

Study Of Gas-Liquid Mass Transfer In Bubble And Spray Column Adding Solid Media, Kritchart Wongwailikhit

Chulalongkorn University Theses and Dissertations (Chula ETD)

Gas absorption is a separation process that transfers substances from gas phase to liquid phases due to the different concentrations. The operation can be applied in many treatments or purifying processes e.g. CO2 absorption from biogas or volatile organic compounds (VOCs) recovery from petroleum emission air. The conventional unit operation using for the gas absorption process are bubble column and spray column. Although there are several literatures reporting the efficiency of spray columns and bubble columns, those were done separately. Therefore, this research projected to investigate both hydrodynamics and mass transfer in both spray and bubble columns and comparing their …

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Heavy Metals Adsorption In Simulated Groundwater Using Iron Oxide Particles And Iron Oxide Coated Sand, Ramy Lun Jan 2018

Heavy Metals Adsorption In Simulated Groundwater Using Iron Oxide Particles And Iron Oxide Coated Sand, Ramy Lun

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to understand adsorption mechanisms of single of heavy metals such as Mn, As and Fe and a combined heavy metal in simulated groundwater using iron oxide particles (IOP) and iron oxide coated sands (IOCS). The experiment was conducted in batch test. In order to understand mechanism of heavy metals adsorption, pseudo first-order and pseudo second-order of kinetic, and Langmuir and Freundlich isotherm models were applied by varying adsorbent dosages from 4 to 24 mg/L ,and 10 to 60 min of times. Optimal dosages for single heavy metals and a combined heavy metal removal were 12, 12, 20 …

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Influential Factors Of Water Conservation Behaviors In Household: A Case Study Of Condominiums In Bangkok, Thailand, Sutida Sirimungkla Jan 2018

Influential Factors Of Water Conservation Behaviors In Household: A Case Study Of Condominiums In Bangkok, Thailand, Sutida Sirimungkla

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aims to investigate water use and water conservation behaviors of people in condominiums in Bangkok, Thailand, and to determine the most influential factor to the behavioral intention, among attitude, social norm, perceived behavioral control (PBC), and information effect. A questionnaire survey of 210 respondents was conducted in Bangkok Metropolitan area between January - April, 2018. Data was analyzed by descriptive statistic to investigate water conservation behaviors and Structural Equation Model (SEM) to examine the determinants of intention to perform the everyday water conservation behaviors and to install water saving devices. The results indicate that two top practices rate …

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Effects Of Monovalent Ions On Low Salinity Waterflooding In Shaly-Sandstone Reservoir, Ativish Yomchan Jan 2018

Effects Of Monovalent Ions On Low Salinity Waterflooding In Shaly-Sandstone Reservoir, Ativish Yomchan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Multi-component Ion Exchange (MIE) was proved to be a major mechanism occurred during Low Salinity Waterflooding (LSWF). Reduction of both total salinity and concentration of divalent ions of injected water together with a presence of monovalent ion results in dissolution of divalent ions linking between rock surface and oil. As a consequence, oil is liberated from rock surface. This study aims to study effects of monovalent ions in MIE mechanism. Stirring test is performed and results show that ion with less hydration radius tends to be more active in MIE; hence, potassium ion and cesium ion illustrate potential in oil …

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Evaluation Of Wax Deposition Prevention For Crude Oil Production From Mae Soon Oil Field, Htet Myat Min Jan 2018

Evaluation Of Wax Deposition Prevention For Crude Oil Production From Mae Soon Oil Field, Htet Myat Min

Chulalongkorn University Theses and Dissertations (Chula ETD)

Waxy crude oils are normally found in petroleum reservoirs. Crude oil with the wax formation is one of the crucial problems for flow assurance of pipeline transportation in oil and gas production. This issue can commonly cause wax deposition problem and it has made a huge amount of economic losses such as production, time and maintenance cost. Therefore, it is a critical aspect to deal with wax deposition for crude oil flow assurance, especially at the surface region in cold climate. In this study, n-heptane and poly (maleic anhydride-alt-1-octadecane) or MA as the inhibitors with different concentrations will be measured …

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Pre-Feasibility Study Of Silica Sand Processing Plant In Sihanoukville Province, Cambodia, Sochea Ros Jan 2018

Pre-Feasibility Study Of Silica Sand Processing Plant In Sihanoukville Province, Cambodia, Sochea Ros

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, bottom ash and flue gas desulfurization (FGD) gypsum are by-products of the coal combustion process from coal-fired power plant. Bottom ash has been applied in many applications such as landfill, cement industry etc., and FGD gypsum is applied in cement and wallboard industry. Also, they can be used in agricultural activities for soil amendment but the amount of bottom ash and FGD used in this function is still low. Furthermore, biochar has long been used to improve soil fertility. The positive impacts of biochar amendment on soils are that it can increase soil capacity to adsorb plant nutrients, decrease …

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Utilization Of Biochar Coupled With Coal Combustion Products For Degraded Soil Amendment, Thidphavanh Sengsingkham Jan 2018

Utilization Of Biochar Coupled With Coal Combustion Products For Degraded Soil Amendment, Thidphavanh Sengsingkham

Chulalongkorn University Theses and Dissertations (Chula ETD)

Low Salinity Waterflooding (LSWF) has been intensively studied worldwide as it is a low-cost technique. By injecting water with very low salinity compared to formation water in the reservoir, the method changes equilibrium between rock surface, oil and surrounding water, causing wettability alteration through Multi-component Ion Exchange (MIE) mechanism. In this study, ammonium ion is added into low salinity water to facilitate the MIE mechanism in shaly-sandstones reservoir. Experiments are performed with shaly-sandstone rock as it contains both calcium and magnesium ions as part of clays and ammonium ion can express its potential by triggering MIE mechanism. Stirring test, spontaneous …

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Simulation Model For Outbound Logistics In Quarry Business, Chanyakan Chawaranggoon Jan 2018

Simulation Model For Outbound Logistics In Quarry Business, Chanyakan Chawaranggoon

Chulalongkorn University Theses and Dissertations (Chula ETD)

The study of outbound logistics is part of quarrying process where final products are being served to customers. It includes all activities begins from when a truck entering weight station to when the truck leaves the system after a final weighing. An increasing of customer demands within limited serving space and limited resources cause a higher total flow time customer spent in the system which also leads to longer queues. The study aims to simulate a current outbound logistics for a quarry business using ARENA simulation model and analyze truck queueing and loader scheduling policy that help reduce total flow …

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Improving Raw Materials Warehouse Utilization And Efficiency In A Haircare Manufacturer, Chariya Paveenchana Jan 2018

Improving Raw Materials Warehouse Utilization And Efficiency In A Haircare Manufacturer, Chariya Paveenchana

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aims to improve the capacity, efficiency, and utilization of raw materials warehouse in a case study of haircare manufacturer in Thailand. At the same time, it is our goal to save the storage cost of finished products at the external public warehouse by locating some of the finished products at this internal raw materials warehouse. The key methodologies used to improve the current raw materials warehouse are removing obsolete materials from the warehouse, regrouping materials according to types, sizes, and turnover rates, reallocating space for each group of materials, considering beam height adjustment, and reassigning the location for …

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Defect Reduction In Manufacturing Process Of In-Mold Decoration Of Injection Molded Components, Jintra Supapan Jan 2018

Defect Reduction In Manufacturing Process Of In-Mold Decoration Of Injection Molded Components, Jintra Supapan

Chulalongkorn University Theses and Dissertations (Chula ETD)

The purpose of this research is to reduce the defect rate from manufacturing process of in-mould decoration (IMD), a process combining PET film with decorative patterns are moulded together with ABS resins, which has been developed to reduce the secondary process of decorative screen printing. Recently, the case study company has produced components with a high defect rate average 11.43% in Feb-Jun 2018, which increased sharply to 22.3% in June 2018. The major causes of the defect resulting from PET film peeled off and difficult to assembly. In order to reduce the defect rate, the five steps of the DMAIC …

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Periodic-Review Order Policy For A Two-Echelon Inventory Problem With Seasonal Demand, Noppadon Sakulsom Jan 2018

Periodic-Review Order Policy For A Two-Echelon Inventory Problem With Seasonal Demand, Noppadon Sakulsom

Chulalongkorn University Theses and Dissertations (Chula ETD)

This dissertation presents methodologies to determine ordering policies for a 2-echelon inventory system with multiple replenishing modes under seasonal demand. The system operates on periodic review basis using reorder point and order-up-to point or (R,s,S). An Echelon stock concept is applied where each location makes decisions on its own inventory information and the information of all locations downstream. We decompose a problem into two phases and propose a methodology based on mixed-integer programming models to determine ordering policies for a system with one replenishing mode. Then, another methodology based on the genetic algorithm and binary search is developed to solve …

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Forecasting International Tourist Arrivals From Major Countries To Thailand, Ontheera Hwandee Jan 2018

Forecasting International Tourist Arrivals From Major Countries To Thailand, Ontheera Hwandee

Chulalongkorn University Theses and Dissertations (Chula ETD)

Tourism industry is one of industries that are very important for Thai economy. In order to achieve effective marketing and resource planning, accurate forecasting of tourist arrivals from major countries to Thailand is necessary for Thai tourism industry. In this paper, various forecasting models are explored to forecast monthly tourist arrivals from China, Malaysia, Korea, Japan, Russia, UK and US. The proposed models include both time series models, i.e., SARIMA, Holt-Winter, and explanatory models, i.e., Multiple Regression and Feed Forward Artificial Neural Networks (FANNs). Economic factors such as income, relative price, exchange rates, and dummy variables of seasonality and news …

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Forecasting Hotel Daily Occupancy For High-Frequency And Complex Seasonality Data, Phoom Ungtrakul Jan 2018

Forecasting Hotel Daily Occupancy For High-Frequency And Complex Seasonality Data, Phoom Ungtrakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Accurate hotel daily occupancy forecasting is an important input for hotel revenue management. This research presents forecasting models both time series and causal methods for a case study 4-star hotel in Phuket, Thailand. Holt-Winters, Box-Jenkins, Box-Cox transformation, ARMA errors, trend and multiple seasonal patterns (BATS), Trigonometric BATS (TBATS), back-propagation Neural Network (BPNN), and Support Vector Regression (SVR) are explored in this work, where Same Day Last Year is considered as benchmark forecast. For causal method, independent variables used as regressor inputs are transformed data observed in the past periods, the number of tourist arrivals from main countries to Phuket, Oil …

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Designing Modular Fixture For Automotive Condenser Inspection, Tanest Lertkajornkitti Jan 2018

Designing Modular Fixture For Automotive Condenser Inspection, Tanest Lertkajornkitti

Chulalongkorn University Theses and Dissertations (Chula ETD)

In the automotive component manufacturing industry, the automotive parts must be produced with high precision according to the standard. And, to achieve such a goal, inspection fixtures are typically used as final inspection tools. These fixtures are highly specialized that often match only one stock-keeping unit of the condenser (SKU) each. Based on such a fact, as the number of SKUs rises, the number of fixtures produced would be inevitably increased, along with the resources required for fixture production, storage space, and maintenance. In order to address such issues, we explore and develop a new fixture design that turns specialized …

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