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Articles 63511 - 63540 of 63656
Full-Text Articles in Entire DC Network
The Validity And Reliability Of The Patient Health Questionnaire 9 In Screening Poststroke Depression, Piyapat Dajpratham
The Validity And Reliability Of The Patient Health Questionnaire 9 In Screening Poststroke Depression, Piyapat Dajpratham
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Poststroke depression occurred about 30% during the first five years after stroke. Timely diagnosis and management could facilitate motor recovery and improve independence. The Patient Health Questionnaire 9 (PHQ-9) is one of the best screening tools for poststroke depression. Since specific screening tool has not yet presented in Thailand, the validity and reliability of the PHQ-9 in stroke patients is clinically essential. Objectives: To study the criterion validity and reliability of the PHQ-9 (Thai version) in screening poststroke depression by comparing to the psychiatric interview as the gold standard. Material and Methods: First ever stroke patients age 45 years …
Significant Coronary Artery Stenosis Assessment: Diagnostic Accuracy Of Quantitative 4d-Mspect Stress Radionuclide Myocardial Perfusion Imaging, Tarit Taerakul
Significant Coronary Artery Stenosis Assessment: Diagnostic Accuracy Of Quantitative 4d-Mspect Stress Radionuclide Myocardial Perfusion Imaging, Tarit Taerakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
OBJECTIVES: The objective of this study was to evaluate the effectiveness of quantitative assessment of radionuclide myocardial perfusion imaging in indicating significant coronary artery stenosis. METHODS: Seven hundred and twenty patients with suspicion of coronary artery disease were retrospectively identified. All of them had undergone cardiac catheterization within the 6-month period after having one-day pharmacologic stress radionuclide myocardial perfusion scan. Important parameters were analyzed including myocardial perfusion, wall motion, wall thickening severity scores of 3 coronary artery territories and left ventricular ejection fraction values. These parameters were subsequently compared with the results of gold standard cardiac catheterization. RESULTS: Binary logistic …
Caring For Patients With Drug Use Disorders In Yangon Region, Myanmar : Socioeconomic And Psychological Burden And Coping Strategies, Khin Zar Khaing Thein
Caring For Patients With Drug Use Disorders In Yangon Region, Myanmar : Socioeconomic And Psychological Burden And Coping Strategies, Khin Zar Khaing Thein
Chulalongkorn University Theses and Dissertations (Chula ETD)
Drug use disorders are considered chronic illnesses, like other severe mental disorders, and caregivers of drug users face a large impact on various aspects of their life. However, there is shortage of research in Myanmar about caregivers' experiences with caring for patients with drug use disorders. This mixed method study, therefore, aims at exploring the socioeconomic and psychological burden caregivers carry, the coping strategies they employ, as well as the barriers to coping they face. The results of the framework analysis revealed that financial loss, productivity loss, social limitation and negative impact on family members are important dimensions of socioeconomic …
System Dynamics Analysis Of Sugar-Sweetened Beverage Taxing Effect On Sugar Consumption, Dental Health Service Utilization And Oral Health For Thai Adults And Elderly, Nipaporn Urwannachotima
System Dynamics Analysis Of Sugar-Sweetened Beverage Taxing Effect On Sugar Consumption, Dental Health Service Utilization And Oral Health For Thai Adults And Elderly, Nipaporn Urwannachotima
Chulalongkorn University Theses and Dissertations (Chula ETD)
Dental caries is a major oral health problem, particularly among developing countries. Almost half of Thai adults and elderly have at least one untreated dental caries. Dental caries can result in debilitating pain that affects work productivity and even the performance of daily activities. The objectives of this study are to develop system dynamics model addressing the relationship of dental caries, sugar consumption and dental health service utilization of Thai population aged 15 and older; and to estimate the changes of dental caries prevalence when the sugar-sweetened beverage tax is implemented. A multi-sector system dynamics model was developed to consolidate …
Simulation Model For Outbound Logistics In Quarry Business, Chanyakan Chawaranggoon
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 …
Improving Raw Materials Warehouse Utilization And Efficiency In A Haircare Manufacturer, Chariya Paveenchana
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 …
Development Of An International Curriculum Model In Education Management For Vietnam Higher Education Institutions, Thi My Ngoc Nguyen
Development Of An International Curriculum Model In Education Management For Vietnam Higher Education Institutions, Thi My Ngoc Nguyen
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purposes of this research are (1) to investigate the current state and the need for internationalization of curriculum of Master Degree in Education Management for Vietnam higher education institutions (2) to analyze good practices for the internationalization of curriculum of Master Degree in Education Management in international universities, (3) to develop an international curriculum management model for Vietnam higher education institutions. The samples include (1) seven policy makers at national and institutional level (2) five administrators at faculty level (3) 67 faculty members, and (4) 217 students from five Vietnamese higher education institutions offering Master Degree in Education Management. …
Defect Reduction In Manufacturing Process Of In-Mold Decoration Of Injection Molded Components, Jintra Supapan
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 …
Periodic-Review Order Policy For A Two-Echelon Inventory Problem With Seasonal Demand, Noppadon Sakulsom
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 …
Steady-State Determination Of Continuous Powder Mixing By Near Infrared Spectroscopy As Process Analytical Technology, Katesaraporn Wongves
Steady-State Determination Of Continuous Powder Mixing By Near Infrared Spectroscopy As Process Analytical Technology, Katesaraporn Wongves
Chulalongkorn University Theses and Dissertations (Chula ETD)
Powder mixing is one of an important unit operation in pharmaceutical manufacturing of solid dosage forms. Continuous mixing was developed as an alternative method to reduce disadvantages of traditional batch mixing processes. This process was originally developed using horizontal cylindrical mixer equipped with Process Analytical Technology (PAT) tools for real-time monitoring. In the present study, a vertical cylindrical mixer was developed and evaluated. Near Infrared (NIR) spectra obtained by monitoring the mixing process were pretreated with Multiplicative Scatter Correction (MSC), second derivative treatment and Norris-William smoothing in the 6800 - 8700 cm-1 range before a calibration model using PLS was …
Preparation And Stabilization Of Saccharide Fiber Produced By Centrifugal Spinning, Pattama Donghuntong
Preparation And Stabilization Of Saccharide Fiber Produced By Centrifugal Spinning, Pattama Donghuntong
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objectives of this study were to prepare saccharide fiber via centrifugal spinning and further investigate its stability under stress condition. Different saccharides were chosen and spun via centrifugal force to form thread like matter. The results indicated that sucrose (SC) and trehalose (TH) could be fabricated as fiber whereas other saccharides were not able to form. The formation of fiber mainly involved with glass transition temperature (Tg), molten ability including stability of saccharide after melting. High Tg saccharides were a good candidate on fiber preparation. Homogeneous melting with appreciable stability was another factor affecting on fiber preparation. Decomposing after …
Chin Diaspora And Their Social Networks In Thailand : Implications For Development In Myanmar, Pau Sian Lian
Chin Diaspora And Their Social Networks In Thailand : Implications For Development In Myanmar, Pau Sian Lian
Chulalongkorn University Theses and Dissertations (Chula ETD)
Due to socioeconomic and political reasons, Chin ethnic people from the western part of Myanmar have been migrating to inner part of the country and abroad. Economic growth and requirement of low skill labor in Thailand since the 1980s have been the pull factors for low skill migrants from its neighbors, including Myanmar. Chin people came to Thailand not only for economic opportunities but also for onward migration. The purpose of this research is to explore the social networks of Chin diaspora in Thailand and their implication to the economic and political development of their home community in Myanmar. With …
Role Of E-Commerce On Trading Sector In China, Jinyi Li
Role Of E-Commerce On Trading Sector In China, Jinyi Li
Chulalongkorn University Theses and Dissertations (Chula ETD)
E-commerce is rapidly developing along with the development of information technology in China. This paper is aimed at analyzing the contribution of E-commerce on the trading sector in China and estimating the macroeconomic and sectoral impact of E-commerce respectively by using fixed effect panel data based on the data from seven selected regions in China over the period of 2008-2016. The study found that E-commerce plays a significant and positive role in the economic growth at either macroeconomic level or sectoral level. Every 1 percent increase in E-commerce's sale leads to an increase of 0.54 percent in the output in …
Economic Security And Development: The Impacts Of Inca Inchi Contract-Farming As An Agricultural Business Model In Kachin State, Myanmar, Zaw Ban
Chulalongkorn University Theses and Dissertations (Chula ETD)
In Myanmar, Inca Inchi is one of the new economic businesses that made changes to the agriculture sector with both its advantages to the quality of life of the people and a high selling price which generates an economic benefit. This study tries to explore the overall social and economic impact that Inca Inchi contract-farming as a business model has had on the security and development specifically for the farmers who signed the contracts with the Inca Inchi companies in the Kachin state, Myanmar. Sample size in Myitkyina Township represented total population. Quantitative data collection method based on primary data …
An Empirical Study Of Human Capital On Economic Growth: An Investigation Using Three Indices Of Human Capital, Shan Shan Fu
An Empirical Study Of Human Capital On Economic Growth: An Investigation Using Three Indices Of Human Capital, Shan Shan Fu
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research reexamines the augmented Solow's growth model to find the relationship between human capital and economic growth by using three different proxies for human capital. The first proxy of human capital is the proportion of labor force with secondary education that has been widely used in many studies. PISA score is the second proxy to human capital. It is regarded as being quality of education because this standardized test score could directly reflect the cognitive ability of individuals. The third proxy is the human capital index constructed by Penn's World Table 9.0 that included both quantitative and qualitative aspects …
What Is The Composition Of Skill Shortages Among Craft And Related Trades Workers In Thailand., Chanticha Chaipairinsiri
What Is The Composition Of Skill Shortages Among Craft And Related Trades Workers In Thailand., Chanticha Chaipairinsiri
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aims to examine the causes of skills shortages among craft and related trades workers in Thailand, to identify the main skills shortages in various occupations, and to identify the policy solutions and the types of workers that need to be encouraged. This thesis thus aims at filling this information gap and testing the consistency of the results by measuring the labour shortages and skills shortages and investigating the policy recommendations that can be successfully implemented. The policy recommendations are focused on improving the efficiency of the labour force of Thailand, particularly through investment in education, which can help …
Expenditure Patterns Of Households Receiving Remittances In Thailand, Sha Ma
Expenditure Patterns Of Households Receiving Remittances In Thailand, Sha Ma
Chulalongkorn University Theses and Dissertations (Chula ETD)
This article, through the data of the Statistics Bureau of Thailand in 2007 and 2015, examines whether remittances brought about by economic migration will affect household expenditure patterns. This study includes three expenditure patterns: education expenditure, housing expenditure, food and beverage expenditure. The result shows remittances have no effect on housing expenditures. Families receiving remittances, the non-poor households pay more on education than the poor households. And poor households always have more expenditure on food and beverage than non-poor households.
Development In Crosslinking System For Natural Rubber And Epoxidized Natural Rubber, Nuttida Srirachya
Development In Crosslinking System For Natural Rubber And Epoxidized Natural Rubber, Nuttida Srirachya
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research was divided into two parts. The first part was to investigate the possibility to use maleic anhydride (MA) as a crosslinking agent for epoxidized natural rubber (ENR). The second one was to investigate the possibility to prepare the thermoreversible crosslinking of natural rubber (NR) when using glycerol (Gly) or diethylene glycol (DGly) as a thermoreversible crosslinking agent. For the first part, it was found that both ENR25 and ENR50 can be crosslinked with MA. From FT-IR spectra, the emerge of two peaks at 1735 cm-1 and 1710 cm-1 indicated that the crosslinking was taken place by the ring …
Cyclic Clique Decompositions Of Powerof Cycles, Apiwat Peereeyaphat
Cyclic Clique Decompositions Of Powerof Cycles, Apiwat Peereeyaphat
Chulalongkorn University Theses and Dissertations (Chula ETD)
A clique decomposition P of a graph G is a collection of cliques of G such that each edge of G belongs to exactly one clique in the collection. We say that P is cyclic if there is an isomorphism : V (G)→ V (G) such that Kk{α (v₁), α (v₂), α (v₃), ... , α (vk)g is a clique in P whenever Kk{v₁; v₂; v₃; :::; vk} is. The k-power of an n-cycle, Ck n, is the graph having the same vertex set as Cn and uv is an edge in Ck n if and only if dCn(u; v) …
Defective Colorings On Complete Bipartite And Multipartite K-Uniform Hypergraphs, Artchariya Muaengwaeng
Defective Colorings On Complete Bipartite And Multipartite K-Uniform Hypergraphs, Artchariya Muaengwaeng
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this thesis, we modify the definition of a defective coloring and a defective chromatic number on graphs to a defective coloring and a defective chromatic number on hypergraphs. First, we find the defective chromatic number on a complete bipartite k-uniform hypergraph and the defective chromatic number on a complete bipartite k-uniform hypergraph of which each color class is acyclic. Second, we determine the defective chromatic number and the defective chromatic number of which each color class is acyclic on a complete k-partite k-uniform hypergraph whose each edge has k vertices from k different partite sets. Finally, we determine the …
Critical Exponent For Nonlinear Nonlocal Equations, Auttawich Manui
Critical Exponent For Nonlinear Nonlocal Equations, Auttawich Manui
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this thesis, we study the nonlinear nonlocal equation ∂t u=J*u-u+u¹+p where p>0 and J is nonnegative, bounded, and radially symmetric with unit integral. The Fourier transform of J satisfies J ̂(ξ)=1-A|ξ|^β (ln1/|ξ| 〗 )^μ+o(〖|ξ|〗^β (ln〖1/(|ξ|)〗 )^μ ) as ξ→0, for 0<β≤2, μ∈R, and A>0. In this study, we establish the local existence, uniqueness, and the comparison principle of solutions. Furthermore, we show that the Fujita critical exponent for this equation is β/n when μ<0. For the case μ>1, we discover that the critical exponent is β/n , and the solutions belong to the global to the small initial data regime.
Streaming Data Classification Method Using Scalable Hyper-Ellipsoids With Linear Discriminant Projection Distance Ratio, Perasut Rungcharassang
Streaming Data Classification Method Using Scalable Hyper-Ellipsoids With Linear Discriminant Projection Distance Ratio, Perasut Rungcharassang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Learning streaming data with limited size of memory storage becomes an interesting problem. Although there have been several learning methods recently proposed, based on the interesting concept of discard-after-learn, the performance of these issues: the learning speed, number of redundant neurons, and classification accuracy of these methods can be further improved in terms of faster speed, less number of neurons, and higher accuracy. The following new four concepts and approaches were proposed in this dissertation: (1) a more generic structure of hyper-ellipsoidal function called Scalable Hyper-Ellipsoidal Function (SHEF) capable of handling the problem of curse of dimensionality by introducing a …
Generalized Symplectic Graphs And Generalized Orthogonal Graphs Over Finite Commutative Rings, Siripong Sirisuk
Generalized Symplectic Graphs And Generalized Orthogonal Graphs Over Finite Commutative Rings, Siripong Sirisuk
Chulalongkorn University Theses and Dissertations (Chula ETD)
Let R be a finite commutative ring with identity, n ∈ N and β a bilinear form on Rⁿ. In this dissertation, we count the numbers of free submodules and totally isotropic free submodules of Rⁿ of rank s by using the lifting idea. We define the generalized bilinear form graph whose vertex set is the set of totally isotropic free submodules of Rⁿ of rank s and the adjacency condition is given by some rank conditions. We study this graph when (Rⁿ, β) is a symplectic space and an orthogonal space. We can determine the degree of each vertex …
Variant Of D'Alembert Functional Equation On Compact Homogeneous Space, Sorawit Viwanthananut
Variant Of D'Alembert Functional Equation On Compact Homogeneous Space, Sorawit Viwanthananut
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this work, we introduce a new functional equation on compact homogeneous spaces based on the d'Alembert functional equation on compact groups. We solve the functional equation by using tools from harmonic analysis.
A Numerical Investigation Of Augmented Heat Transfer In Rectangular Ducts With Ribs, Warissara Tangyotkhajorn
A Numerical Investigation Of Augmented Heat Transfer In Rectangular Ducts With Ribs, Warissara Tangyotkhajorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
The application of roughness structure of ribs inside a smooth channel is one effective way of heat transfer augmentation, but the accompanied pressure drop could be high. A novel V-rib design with branches was introduced and numerical simulations on the thermo-fluid impact of heat transfer and pressure drop were investigated. The parameters of investigation include the branching number and the pitch ratio of the V-ribs. It appears that increasing the relative pitch ratio serves to improve the overall performance of a roughened channel. The effect of the branching number is only experienced at low pitch ratio. At high pitch ratio, …
The Measurement Of Transverse Relaxation Time (T2) Using Histogram From Roi Setting In Muscle Activity Study At 1.5 Tesla Mri, Kannikar Kanyakham
The Measurement Of Transverse Relaxation Time (T2) Using Histogram From Roi Setting In Muscle Activity Study At 1.5 Tesla Mri, Kannikar Kanyakham
Chulalongkorn University Theses and Dissertations (Chula ETD)
Muscle functional MRI (mfMRI) is the method to evaluate the muscle activity before and immediately after the muscle exercise by the magnetic resonance images. Exercise of skeletal muscles enhances image contrast in T2-weighted magnetic resonance (MR) images. In previous studies, the exercised physiology used multiple-spin-echo (MSE) sequences for calculating transverse relaxation time (T2) with several small regions of interest (ROI) within the target tissue. Such a method may not represent all properties of the target tissue. The purpose of this study is to measure T2 in rest and exercise muscle at 1.5 Tesla MRI using average mode values in histogram …
Eye Lens Dose Measurement In Patients During Brain Arteriovenous Malformation Interventional Neuro-Radiology Procedure, Rasalin Thana
Eye Lens Dose Measurement In Patients During Brain Arteriovenous Malformation Interventional Neuro-Radiology Procedure, Rasalin Thana
Chulalongkorn University Theses and Dissertations (Chula ETD)
Brain arteriovenous malformation (AVM) interventional neuroradiology (INR) is a complicated procedure which the patients may receive the high radiation dose exceeding the threshold level for detectable eye lens opacities and cataracts (ICRP, 2012). The objectives of this study are to measure the patient eye lens dose using optically stimulated luminescence dosimeter, OSLD, during AVM INR procedure at Interventional Radiology Unit, Department of Radiology, King Chulalongkorn Memorial Hospital (KCMH) and to study the factors affecting the patient eye lens dose. NanoDot OSLDs were attached on the transparent radiation thin film eyewear and closed to the patient eyelids during the procedure. Philips …
Investigation Of Parameters For Metallic Artifact Reduction Using 3-D Space In Mr Lumbar Spine At 1.5 Tesla: A Phantom Study, Thanatchaya Lowong
Investigation Of Parameters For Metallic Artifact Reduction Using 3-D Space In Mr Lumbar Spine At 1.5 Tesla: A Phantom Study, Thanatchaya Lowong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Metallic artifact reduction in magnetic resonance imaging (MRI) has increasingly interested especially metal implant postoperative in lumbar spine. Recently, the new pulse sequence based on true isotropic 3D voxel with high resolution namely Sampling Perfection with Application Optimized Contrasts using Different Flip Angle Evolutions (SPACE) was introduced. This study aimed to determine the appropriate 3D T2-SPACE parameters for reducing the metallic artifact in MR lumbar spine 1.5 Tesla. Cylindrical phantom filled with 3.3 g/L, NiCl2-6H2O and 2.4 g/L NaCl solution, and two commonly used metal implants (stainless steel and titanium) for lumbar spine were acquired using turbo spin echo (TSE) …
The Pharmacokinetic Model Of 18f-Fdopa In Pet Brain Imaging For Early ParkinsonS Disease, Wirunpatch Buratachwatanasiri
The Pharmacokinetic Model Of 18f-Fdopa In Pet Brain Imaging For Early ParkinsonS Disease, Wirunpatch Buratachwatanasiri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Parkinson’s disease (PD) symptom usually appears when over half of all dopaminergic neurons have died. Early detection and treatment approach are; therefore, very important. The 18F-FDOPA PET scan is extensively examined to differentiate the normal and pathological dopamine metabolism in the human brain. The purpose of this study was to investigate the transfer rate constants of 18F-FDOPA in PET brain imaging based on compartmental model in early Parkinson’s disease. The retrospective data from five early PD patients who underwent 18F-FDOPA PET brain scan at King Chulalongkorn Memorial Hospital (KCMH) were collected. After 18F-FDOPA was administered intravenously, PET images were acquired …
Hsv-1 Induces Filopodia Formation In Activated T Lymphocytes, Thanayod Sasivimolrattana
Hsv-1 Induces Filopodia Formation In Activated T Lymphocytes, Thanayod Sasivimolrattana
Chulalongkorn University Theses and Dissertations (Chula ETD)
Herpes simplex virus type 1 (HSV-1) is a widespread pathogen, which has diverse clinical manifestations from mild localized infection to severe systemic infection. The tissue tropism of HSV-1 is mainly epithelial and mucosal cells. However, it can also multiply in T lymphocytes suggesting a cause of viremia. In this study, CD3+CD4-CD8- Jurkat T lymphocytes were used. Under activation, up-regulation of CD69 molecules on cell surface was observed. Increase yield of HSV-1 production in activated T lymphocytes was demonstrated. In addition, most of HSV-1 virion progenies from infected T lymphocytes were released extracellularly, suggesting the cause of dissemination. The mechanism which …