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Articles 4921 - 4950 of 6471
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A Peer-To-Peer Protocol For Prioritized Software Updates On Wireless Sensor Networks, Natchanon Nuntanirund
A Peer-To-Peer Protocol For Prioritized Software Updates On Wireless Sensor Networks, Natchanon Nuntanirund
Chulalongkorn University Theses and Dissertations (Chula ETD)
Software updating is essential for devices in wireless sensor networks for adding new features, improving performance, or patching vulnerabilities. But since some deployed devices are unable to be accessed directly, data dissemination protocol is used for distributing the update to those devices. However, each software updating may have different priority, for instance, an update that adds an optional feature does not have to be applied as fast as an update that patches severe vulnerabilities. This research presents a reliable data dissemination protocol which is configurable for energy-speed trade-off deriving some concepts from BitTorrent such as Handshaking, Segmented File Transfer, and …
Semantic Segmentation On Remotely Sensed Images Using Deep Convolutional Encoder-Decoder Neural Network, Teerapong Panboonyuen
Semantic Segmentation On Remotely Sensed Images Using Deep Convolutional Encoder-Decoder Neural Network, Teerapong Panboonyuen
Chulalongkorn University Theses and Dissertations (Chula ETD)
One of the fundamental tasks in remote sensing is the semantic segmentation of the aerial and satellite images. It plays a vital role in applications, such as agriculture planning, map updates, route optimization, and navigation. The state-of-the-art model is the Deep Convolutional Encoder-Decoder (DCED). However, the accuracy is still limited since the architecture is not designed for recovering low-level features, e.g., river, low vegetation on remotely sensed images, and the training data in this domain are deficient. In this dissertation, we aim to propose the semantic segmentation architecture in five aspects, designed explicitly for the remotely sensed field. First, we …
Ocean Current Prediction In The Gulf Of Thailand Using Spatio-Temporal Deep Learning On High-Frequency Radar, Nathachai Thongniran
Ocean Current Prediction In The Gulf Of Thailand Using Spatio-Temporal Deep Learning On High-Frequency Radar, Nathachai Thongniran
Chulalongkorn University Theses and Dissertations (Chula ETD)
Ocean surface current prediction is a crucial task for a variety of marine activities, such as disaster monitoring, search and rescue operations, power forecasting, and etc. There are three traditional forecasting approaches: (i) numerical based approach, (ii) time series based approach and (iii) machine learning based approach. However, their prediction accuracy was limited as they did not cooperate with spatial and temporal effects together, including oceanic knowledge is also not considered. This paper introduces the ocean surface prediction model that accounts for spatial and temporal characteristics by a combination between CNN and GRU and also the incorporation of oceanic inputs …
การพัฒนารูปแบบการจัดการเรียนการสอนโลจิสติกส์สากลสำหรับนักศึกษาปริญญาบัณฑิต, นภัสพร แสงพายัพ
การพัฒนารูปแบบการจัดการเรียนการสอนโลจิสติกส์สากลสำหรับนักศึกษาปริญญาบัณฑิต, นภัสพร แสงพายัพ
Chulalongkorn University Theses and Dissertations (Chula ETD)
การวิจัยนี้มีวัตถุประสงค์เพื่อ 1) ศึกษาและวิเคราะห์สมรรถนะโลจิสติกส์สากลของนักศึกษาไทยในสภาพปัจจุบัน 2) ศึกษาและวิเคราะห์สภาพสมรรถนะโลจิสติกส์สากลที่พึงประสงค์ 3) วิเคราะห์ช่องว่างการเรียนการสอนโลจิสติกส์สากลในสถาบันอุดมศึกษาไทย 4) พัฒนารูปแบบการจัดการเรียนการสอนโลจิสติกส์สากลสำหรับนักศึกษาปริญญาบัณฑิต เก็บข้อมูลจากกลุ่มตัวอย่าง ประกอบด้วย 1) อาจารย์ผู้สอนโลจิสติกส์ 30 ราย 2) ผู้รับจัดการขนส่งระหว่างประเทศ 50 ราย 3) อาจารย์ผู้รับผิดชอบหลักสูตรโลจิสติกส์ 11 ราย 4) ผู้บริหารหลักสูตรโลจิสติกส์และผู้เชี่ยวชาญโลจิสติกส์ 8 ราย วิเคราะห์ข้อมูล โดยการวิเคราะห์สาระ วิเคราะห์สมรรถนะโลจิสติกส์ และสมรรถนะสากล และสถิติที่ใช้คือ ค่าความถี่ ค่าร้อยละ ค่าเฉลี่ย ส่วนเบี่ยงเบนมาตรฐาน และการวิเคราะห์องค์ประกอบ ( Factor Analysis) ผลการวิจัย สรุปได้ดังนี้ 1. สมรรถนะโลจิสติกส์สากลของนักศึกษาในสภาพปัจจุบันมีความแตกต่างกันคือ กลุ่มอาจารย์เห็นว่าสมรรถนะโลจิสติกส์สากลด้านความรู้เชิงอาชีพโลจิสติกส์ ด้านทักษะพื้นฐานส่วนบุคคล ด้านคุณลักษณะเชิงอาชีพโลจิสติกส์ มีมากที่สุดโดยมีค่าเฉลี่ยสูงสุด ส่วนกลุ่มผู้ประกอบการรับจัดการขนส่งระหว่างประเทศเห็นว่าสมรรถนะโลจิสติกส์สากลด้านความรู้พื้นฐานส่วนบุคคล ด้านทักษะเชิงพฤติกรรม และด้านคุณลักษณะเชิงอาชีพโลจิสติกส์ มีมากที่สุดโดยมีค่าเฉลี่ยสูงสุด 2. สมรรถนะโลจิสติกสากลของนักศึกษาสภาพที่พึงประสงค์มีความแตกต่างกันคือ กลุ่มอาจารย์เห็นว่าสมรรถนะโลจิสติกส์สากลด้านความรู้เชิงอาชีพ โลจิสติกส์ ด้านทักษะพื้นฐานส่วนบุคคล ด้านคุณลักษณะพื้นฐานส่วนบุคคล พึงประสงค์มากที่สุดโดยมีค่าเฉลี่ยสูงสุด ส่วนกลุ่มผู้ประกอบการรับจัดการขนส่งระหว่างประเทศ เห็นว่าสมรรถนะโลจิสติกส์สากลด้านความรู้เชิงพฤติกรรม ด้านทักษะพื้นฐานส่วนบุคคล และด้านคุณลักษณะเชิงอาชีพโลจิสติกส์ พึงประสงค์มากที่สุดโดยมีค่าเฉลี่ยสูงสุด 3. การพัฒนาการเรียนการสอนโลจิสติกส์สากลมุ่งพัฒนาสมรรถนะโลจิสติกส์สากลให้มีมากขึ้นกว่าสภาพสมรรถนะโลจิสติกส์ที่พึงประสงค์ของหลักสูตร โลจิสติกส์ไทย ในด้านความรู้นั้นควรมีการพัฒนาสมรรถนะความรู้เรื่องการจัดการคุณภาพและลูกค้า การบริหารสัญญา การจัดการสภาวะโลก วัฒนธรรมที่แตกต่าง อุตสาหกรรมโลจิสติกส์ ในด้านทักษะนั้นควรมีการพัฒนาสมรรถนะทักษะด้านการทำงานบนวัฒนธรรมที่แตกต่าง การจัดการลูกค้า การจัดการคุณภาพ การเป็นผู้ประกอบการ และการพัฒนาผลิตภัณฑ์ ในด้านคุณลักษณะนั้นควรพัฒนาสมรรถนะด้านความเข้าใจรูปแบบการใช้ชีวิตที่แตกต่าง มุ่งเป้าหมายเชิงกลยุทธ์ มุมมองคุณค่าการเป็นผู้ประกอบการ มีความเป็นพลวัตรและมีอิสระ 4. รูปแบบการจัดการเรียนการสอนโลจิสติกส์สากลสำหรับนักศึกษาปริญญาบัณฑิตประกอบ ด้วย 4.1) การพัฒนาสมรรถนะ โลจิสติกส์สากล 4 องค์ประกอบ ภายใต้ GLOB Mdel คือ สมรรถนะด้านพื้นฐานส่วนบุคคล สมรรถนะเชิงอาชีพโลจิสติกส์ สมรรถนะเชิงธุรกิจอุตสาหกรรม และสมรรถนเชิงพฤติกรรม 4.2) การพัฒนาหลักสูตรโลจิสติกส์ไทยด้วยสมรรถนะโลจิสติกส์สากลที่ได้คัดเลือกจำนวน 25 …
Effects Of Non-Albicans Candida Species On Biofilm Formation And Acidogenicity Of Dual-Species Biofilms And On Cariogenic Virulence Gene Expression Of Streptococcus Mutans, Wirunphat Sansanoa
Effects Of Non-Albicans Candida Species On Biofilm Formation And Acidogenicity Of Dual-Species Biofilms And On Cariogenic Virulence Gene Expression Of Streptococcus Mutans, Wirunphat Sansanoa
Chulalongkorn University Theses and Dissertations (Chula ETD)
Early childhood caries is a common oral disease found in children which could affect their general health. Streptococcus mutans is an important cariogenic pathogen since it possesses cariogenic properties, which are acid production, acid tolerance and biofilm formation. Recent studies showed that Candida albicans, which is frequently found together with S. mutans in plaques of children with dental caries, enhances cariogenicity. At the same time, increasing prevalence of non-albicans Candida species (NACs) in children and immune-compromised patients has been reported. Therefore, this study aims to investigate the effects of NACs when co-cultured with S. mutans on cariogenic properties and virulence …
Evaluation Of Maxillary Sinus On Anatomical Characteristics And Related Factors Using Cone Beam Computed Tomography Images, Nutcha Benjaphalakron
Evaluation Of Maxillary Sinus On Anatomical Characteristics And Related Factors Using Cone Beam Computed Tomography Images, Nutcha Benjaphalakron
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objective: The aim of this study was to evaluate prevalence of the anatomical characteristics in maxillary sinuses; and its association with sex, age, tooth area and dental status using cone beam computed tomography (CBCT). Methods: Retrospectively reviewed CBCT images of maxillary sinuses from 370 sinuses in 185 patients at the Faculty of Dentistry, Chulalongkorn University were evaluated. Residual ridge height (RRH), lateral wall thickness (LWT), sinus septa, posterior superior alveolar artery (PSAA), membrane thickness (MT) and ostium were evaluated and compared according to sex, age, tooth area and dental status. Results: Mean RRH was 12.13 ± 3.64 mm. Mean LWT …
Facial Features Detection System For Classifying Critical Situation Of Brain Surgery Postoperative Patients, Bhatarasiri Slakkham
Facial Features Detection System For Classifying Critical Situation Of Brain Surgery Postoperative Patients, Bhatarasiri Slakkham
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purpose of this research is to create a model for detecting a help signal from stroke patients after surgery. Through artificial intelligence technology by detecting via a patient's face image to help reducing workload and hospital’s expenses. The data is collected from the Stroke Unit, King Chulalongkorn Memorial Hospital at the intensive care unit (ICU). The total number of samples is 8 persons, all these 8 were screened by the doctor and completed the consent forms before data being collected. The method of data collection is performed by attaching 3 small cameras on three positions: the left, right and …
Akt Expression And Lactose Synthesis During Heat Exposure In Saanen Goat, Nungnuch Saipin
Akt Expression And Lactose Synthesis During Heat Exposure In Saanen Goat, Nungnuch Saipin
Chulalongkorn University Theses and Dissertations (Chula ETD)
In tropical countries, high ambient temperature (HTa) is a fundamental factor that cause a decline in the mammary gland function in dairy animals. Dairy animals fed under HTa decreased milk yield (MY) as well as milk compositions. The current study focuses on the effect of HTa to decrease milk synthesis from natural and in vitro HTa condition. The first experiment was performed to investigate the effect of HTa from the natural condition in early lactating Saanen goat, 2-4 weeks of postpartum (2 PP-4 PP). Five animals were investigated during the winter season as control ambient condition. Six animals as the …
The Left Ventricular Functions And Heart Rate Variability In Dogs With Pulmonic Valvular Stenosis, Ploypanut Trikhun
The Left Ventricular Functions And Heart Rate Variability In Dogs With Pulmonic Valvular Stenosis, Ploypanut Trikhun
Chulalongkorn University Theses and Dissertations (Chula ETD)
Pulmonic valvular stenosis (PS) is one of the most common congenital heart diseases in dogs that can lead to the cardiac maladaptation. Also, PS can affect the cardiac autonomic nervous system (ANS). However, clinical information regarding to systolic function and cardiac ANS alteration in PS dogs had not been fully elucidated. The objectives of this study were to evaluate cardiac electrical property, left ventricular (LV) function, and to assess cardiac ANS from heart rate variability (HRV) analysis in PS dogs compared with healthy dogs. The dogs in this study were divided into 2 groups, PS dogs (n=13) and healthy control …
Automatic Model Identification For Time Series Analysis Using Deep Learning, Paisit Khanarsa
Automatic Model Identification For Time Series Analysis Using Deep Learning, Paisit Khanarsa
Chulalongkorn University Theses and Dissertations (Chula ETD)
Most time series data can be characterized by a linear process via the autoregressive integrated moving average model requiring a three-component vector which are the autoregressive, differencing, and moving average orders before fitting coefficients. A model identification which determines those orders is analyzed via the partial autocorrelation function to identify the autoregressive order, the autocorrelation function to identify the moving average order and an extended sample autocorrelation function to identify both orders which is a challenging problem for statisticians. Accordingly, the auto-ARIMA model was proposed to automatically vary those orders and estimates their corresponding coefficients. This thesis proposes three architectures …
Self-Balancing Recursive Partitioning Algorithm For Classification Problems, Artit Sagoolmuang
Self-Balancing Recursive Partitioning Algorithm For Classification Problems, Artit Sagoolmuang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Creating an effective classification model has been played an important role in knowledge discovery in a database methodology for the past several years. However, there is a critical issue that significantly affects the classification performance appearing in many real-world situations, which is called a class imbalanced problem. In this dissertation, a classification model built based on the recursive partitioning algorithm is improved under the concept of modified entropy components for handling a classification problem regardless of the class imbalanced situation. Three methodologies are introduced for achieving different purposes. The first methodology is presented to classify a binary-class imbalanced dataset dealing …
Solving System Of Linear Integro-Differential Equations By Finite Integration Method With Shifted Chebyshev Polynomials, Matinee Juytai
Solving System Of Linear Integro-Differential Equations By Finite Integration Method With Shifted Chebyshev Polynomials, Matinee Juytai
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this thesis, we modify the finite integration method by using the shifted Chebyshev polynomial (FIM-SCP). The major tool of our FIM-SCP is the shifted Chebyshev integration matrix. It is constructed in order to be a matrix representation for integrating over interpolated points which are generated by the zeros of shifted Chebyshev polynomial of a certain degree. The efficiently numerical algorithms are then created by the modified FIM-SCP for seeking approximate solutions of a system of stiff linear ordinary differential equations, a system of linear Volterra integro-differential equations, and a system of linear Fredholm integro-differential equations under some given boundary …
Co-Expression Of Feedback Resistant Enzymes In Phenylalanine Biosynthesis Pathway To Increase Phenylalanine Production, Charintip Yenyuvadee
Co-Expression Of Feedback Resistant Enzymes In Phenylalanine Biosynthesis Pathway To Increase Phenylalanine Production, Charintip Yenyuvadee
Chulalongkorn University Theses and Dissertations (Chula ETD)
L-Phenylalanine (L-Phe) is an important commercial amino acid. It is widely used in food and pharmaceutical industries. Currently, the requirement of L-Phe is increased according to the great demand for the low-calorie sweetener, aspartame. In Escherichia coli, the synthesis of L-Phe is controlled by the multi-hierarchical regulations. AroG isoform of 3-deoxy- D-arabino-heptulosonate-7-phosphate synthase (DAHP synthase) and chorismate mutase/prephenate dehydratase (PheA), two important enzymes, are feedback inhibited by LPhe. Co-expression of feedback-resistant pheA (pheA[superscript L359D]) with other pivotal genes in L-Phe biosynthesis pathway: aroB, aroL, phedh, tktA, aroG, pheA, yddG, and glpF in pRSFDuet-1 (pPTFBLYA[superscript L359D]) elevated L-Phe production of E. …
Fructooligosaccharide Synthesis By Immobilized Inulosucrase From Lactobacillus Reuteri 121 And Improvement Of Product Pattern Using Site-Directed Mutagenesis, Thanapon Charoenwongpaiboon
Fructooligosaccharide Synthesis By Immobilized Inulosucrase From Lactobacillus Reuteri 121 And Improvement Of Product Pattern Using Site-Directed Mutagenesis, Thanapon Charoenwongpaiboon
Chulalongkorn University Theses and Dissertations (Chula ETD)
Inulin-type fructooligosaccharides (IFOS) are well-known prebiotics which can be produced from sucrose using bacterial inulosucrase (E.C. 2.4.1.9). However, the use of inulosucrase for IFOS synthesis has some limitations because it also synthesizes some polysaccharides and exhibits lower stability than the fungal enzymes. To overcome these limitations, improvement of inulosucrase was made by using enzyme immobilization and enzyme engineering. First, inulosucrase from Lactobacillus reuteri 121 was immobilized on a novel, high capacity core-shell chitosan beads using glutaraldehyde as a cross-linker. The results showed that both immobilized and free inulosucrase had the same optimum pH (5.5), while the optimum temperature was shifted …
Reproductive And Developmental Biology Of Rice Field Crab Esanthelphusa Nani (Naiyanetr, 1984), Rachata Maneein
Reproductive And Developmental Biology Of Rice Field Crab Esanthelphusa Nani (Naiyanetr, 1984), Rachata Maneein
Chulalongkorn University Theses and Dissertations (Chula ETD)
The rice field crabs are freshwater crabs that can be considered as pest in paddy field as well as a stable food source by local people. Either of these roles requires a good knowledge of its reproductive biology to manage population in nature. In this study, reproductive and endocrine cycles of male and female, and development of embryo were examined. Adult Esanthelphusa nani were field caught from Nan province during November 2015 to November 2016. Crabs were euthanized and dissected for reproductive tracts. Accessory organ nearby the mandibular muscle was collected for endocrine activities in male, while hemolymph was collected …
Ecosystem Function Assessment And Participatory Modelling For Community Forest Management At Lainan Subdistrict, Wiang Sa District, Nan Province, Wuthiwong Wimolsakcharoen
Ecosystem Function Assessment And Participatory Modelling For Community Forest Management At Lainan Subdistrict, Wiang Sa District, Nan Province, Wuthiwong Wimolsakcharoen
Chulalongkorn University Theses and Dissertations (Chula ETD)
Community forest management (CFM) is one way used to mitigate deforestation and forest degradation which have been occurring for more than half a century, particularly in northern Thailand. The collaboration in CFM, especially at multiple scales (e.g. subdistrict, district, or provincial levels) is essential to improve a forest ecosystem status and avoid forest degradation risks in the future. Recently, integrative and participatory modelling methodologies, specifically the Companion Modelling (ComMod), have been implemented in the context of sustainable common-pool resource management in several regions of the world. However, the application of this approach in CFM across institutional scales has still been …
Development Of Zero-Waste Package For Asphalt From Natural Rubber / Ethylene Vinyl Acetate Copolymer Thermoplastic Vulcanizates, Nappaphan Kunanusont
Development Of Zero-Waste Package For Asphalt From Natural Rubber / Ethylene Vinyl Acetate Copolymer Thermoplastic Vulcanizates, Nappaphan Kunanusont
Chulalongkorn University Theses and Dissertations (Chula ETD)
Asphalt is normally delivered in liquid form which was heated all the time. It consumes more energy and need the special truck to deliver it. An alternative way to deliver the asphalt in form of solid covered with package can reduce energy consumption and normal truck can be used to deliver. The objective of this research was to develop the zero-waste package for asphalt that was no waste after use and not harmful to asphalt properties. The research consists of two parts which are (1) development of package from natural rubber (NR) and ethylene vinyl acetate copolymer (EVA) thermoplastic vulcanizates …
Separation Of Trace Palladium Chloro Complexes From Wastewater Of Electroless Plating Process Via Hollow Fiber Supported Liquid Membrane, Vanee Mohdee
Chulalongkorn University Theses and Dissertations (Chula ETD)
The separation of palladium (Pd (II)) from wastewater containing copper (Cu (II)) and nickel (Ni (II)) is investigated via hollow fiber supported liquid membrane (HFSLM). The viability to separate Pd (II) was established by controlling the influence of operating conditions viz. aqueous feed acidity, carrier concentration, types of stripping solution as well as flows rate of feed and stripping solutions. A complete separation of Pd (II) acheiving >99% extraction and 87.09% recovery was demonstrated under optimum conditions of 6%(v/v) Aliquat 336, pH 2 as aqueous feed acidity, 0.5 M thiourea mixed with 0.1 M HCl as a strippant and 100 …
Chemometric Method To Enhance Sensitivity And Selectivity For Surface Enhanced Raman Scattering Technique, Nontawat Sricharoen
Chemometric Method To Enhance Sensitivity And Selectivity For Surface Enhanced Raman Scattering Technique, Nontawat Sricharoen
Chulalongkorn University Theses and Dissertations (Chula ETD)
The multivariate curve resolution-alternative least square (MCR-ALS) algorithm was modified with sample insertion constraint. This developed method was proposedly used to deconvolute the overlapping signals in Surface enhance Raman attering (SERS) measurement. The developed method was elucidated with the spectral data simulated by using Gaussian distribution function to generate two independent peaks which correspond to capping agent and analyte, respectively. The spectrum of the two peaks was generated with different overlapping levels (RS = 0 – 1.50) and concentration ratio of analyte and capping agent concentration at 0.01 – 1.00. In MCR-ALS with sample insertion constraint, the number of capping …
Determination Of Perchlorate And Thiocyanate Ions By Ion-Selective Membrane And Bulk Optode Techniques Using Experimental Design Approach, Supacha Wirojsaengthong
Determination Of Perchlorate And Thiocyanate Ions By Ion-Selective Membrane And Bulk Optode Techniques Using Experimental Design Approach, Supacha Wirojsaengthong
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aimed to develop the detection method for perchlorate and thiocyanate in aqueous solutions using potentiometric and colorimetric techniques. The optimum conditions were designed by the central composite design (CCD) with response surface methodology (RSM). The potentiometric response of perchlorate‒selective electrode using di‒tripodal amine calix[4]arene copper(II) complex (L1-Cu) in PVC membrane was studied. The optimized pH, ion exchanger and ionophore concentrations were found at pH 8.0, 3.25 mmol/kg and 13.25 mmol/kg, respectively. The optimized condition performed a Nernstian slope of –58.02 mV/decade with R2=0.9994 in a working concentration range of 1.00×10‒6 – 1.00×10‒2 M, and the detection limit was …
Development Of Green Methods For Synthesis Of 2-Aminobenzoxazoles From Organosulfurs, Theeranon Tankam
Development Of Green Methods For Synthesis Of 2-Aminobenzoxazoles From Organosulfurs, Theeranon Tankam
Chulalongkorn University Theses and Dissertations (Chula ETD)
2-aminobenzoxazoles are an important motif in pharmaceutical and chemical industries, however, their preparations involve the use of toxic reagents and organic solvents. Therefore, greener methods for preparation of 2-aminobenzoxazoles are highly desired. In this work, we demonstrate two novel methodologies for synthesis of 2-aminobenzoxazoles in aqueous media. The first method involves the use of "on water" microwave reaction to perform the amination of 2-mercaptobenzoxazoles into 2-aminobenzoxazoles. Various 2-aminobenzoxazoles are synthesized under additive-free condition accelerating by microwave irradiation at 100 oC for 1 hour in moderate to good yields. This synthesis can be applied to prepare 2-aminobenzoxazole in gram scale quantity. …
Development Of A Readiness Model For The Application Of Precast Concrete In Housing Construction: A Case Study In Myanmar, Aung Phone Myint
Development Of A Readiness Model For The Application Of Precast Concrete In Housing Construction: A Case Study In Myanmar, Aung Phone Myint
Chulalongkorn University Theses and Dissertations (Chula ETD)
Precast concrete construction has been verified that it is one of the solutions for the growth of urbanization and housing development. In addition, it helps to reduce the labor requirement and material wastage in construction. However, the use of precast concrete technology is not still popular and not widely used within the Myanmar housing construction industry. Moreover, there is no readiness assessment model encompassed the readiness of construction industry including major stakeholders who are representatives of the construction industry for accepting the new technology. Therefore, the aim of this study is to develop a readiness model that can assess the …
Bioactive Compounds From Lichen Usnea Aciculifera Vain And Usnic Acid Conjugates, Truong Tuong Lam
Bioactive Compounds From Lichen Usnea Aciculifera Vain And Usnic Acid Conjugates, Truong Tuong Lam
Chulalongkorn University Theses and Dissertations (Chula ETD)
Phytochemical investigation of lichen Usnea aciculifera Vain led to the isolation of nine new dimeric xanthones, usneaxanthones A-I (36–44), along with 36 known compounds (1–35, 45). The chemical structures of the isolated compounds were elucidated by a combination spectroscopic data (1D, 2D NMR, HRESIMS), ECD experiments, and single-crystal X-ray as well as comparison of their NMR data with those in the literature. The biological activities of isolated compounds were evaluated for antibacterial, anti-dengue and cytotoxic activites. The results revealed that depsides may have potential as lead compounds for the development of new antibacterial and anti-dengue agents. Futhermore, dimeric xanthones exhibited …
A Business Success Evaluation Of Market Entry Mode Types In Myanmar Construction, Naw Ruth Po Gay
A Business Success Evaluation Of Market Entry Mode Types In Myanmar Construction, Naw Ruth Po Gay
Chulalongkorn University Theses and Dissertations (Chula ETD)
The optimal entry mode decision and knowing the critical success factors are important for successful international market expansion. However, there are not many studies for developing Asian countries, such as Myanmar. Investors need to know what factors influence entry mode decision and business success. Therefore, the objectives of this study are 1) to identify the factors that influence entry modes decision, 2) to identify the critical success factors of entry modes for business, 3) to identify the significant factors that affect business success. The questionnaire survey using a five-point Likert scale was developed and distributed in Yangon, the commercial city …
Modified Response Spectrum Analysis For Computing Seismic Demands Of Multi-Tower Building Sharing A Common Podium, Tarek Youssef
Modified Response Spectrum Analysis For Computing Seismic Demands Of Multi-Tower Building Sharing A Common Podium, Tarek Youssef
Chulalongkorn University Theses and Dissertations (Chula ETD)
To design irregular tall buildings, performance-based design (PBD) approach, which requires nonlinear response history analysis (NLRHA), is the most accurate method. However, PBD approach is not always used in the current design practice because of its complexity, and as allowed in ASCE 7-16, design engineer can use code-based approach such as response spectrum analysis (RSA) procedure. This paper aims to investigate the accuracy of RSA procedure when applied to irregular tall buildings, and in particular for multi-tower buildings sharing a common podium. Also, a modified response spectrum analysis (MRSA) procedure previously proposed for computing shear demand in regular tall buildings, …
Fundamental Solutions Of Multi-Layer Elastic Media With Couple Stress Theory, Wipavee Wongviboonsin
Fundamental Solutions Of Multi-Layer Elastic Media With Couple Stress Theory, Wipavee Wongviboonsin
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis presents fundamental solutions of a two-dimensional, elastic, multi-layered medium under surface loadings by taking the influence of material micro-structure into account. An underlying mathematical model for simulating such small-scale influence is established within the continuum-based framework via the well-known couple stress theory. For each material layer, the generalized Navier’s equation governing the displacement field is established and the method of Fourier integral transform is applied to derive its general solution in a transformed space. A set of boundary conditions and the continuity of fields along the material interfaces are enforced to obtain a system of linear algebraic equations …
Effects Of Slco1b3, Abcb1 And Cyp3a5 Polymorphisms On Clinical Response And Adverse Events Of Paclitaxel-Based Chemotherapy In Advanced Non-Small-Cell Lung Cancer Patients, Pawienar Mueangprom
Effects Of Slco1b3, Abcb1 And Cyp3a5 Polymorphisms On Clinical Response And Adverse Events Of Paclitaxel-Based Chemotherapy In Advanced Non-Small-Cell Lung Cancer Patients, Pawienar Mueangprom
Chulalongkorn University Theses and Dissertations (Chula ETD)
Paclitaxel is recommended first-line therapy for patients with advanced non-small cell lung cancer. Genetic polymorphisms of Paclitaxel’s metabolic pathway may affect treatment outcomes and adverse events. The purpose of this study was to determine the association of genetic polymorphisms and clinical outcomes. A total of 58 Thai NSCLC patients with Paclitaxel-based chemotherapy were enrolled for this cohort study. The prevalence of variant allele of SLCO1B3 (rs7311358), ABCB1 (rs2032582) and CYP3A5 (rs776746) were 72.4%, 40.5% and 67.5%, respectively. This study found that SLCO1B3, ABCB1 and CYP3A5 polymorphisms were not associated with clinical response and clinical benefit in paclitaxel-based chemotherapy among Thai …
An Affordable Immunohistochemical Approach To Estimate The Prevalence Of Braf V600e Mutation In Papillary Thyroid Cancer Patients Of King Chulalongkorn Memorial Hospital, Thailand., Sonam Choden
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Papillary thyroid carcinoma (PTC) accounts for the majority of diagnoses of thyroid carcinoma. BRAFV600E mutation is the most common genetic alteration in PTC, which has diagnostic and prognostic significance. The rate of BRAFV600E mutation in PTC from Thailand has not been reported. Our purpose was to estimate the prevalence of BRAF mutation in a large institutional series using an affordable approach, which combined mutation-specific immunohistochemistry (IHC) with VE1 antibody and tissue microarray (TMA). Methods: A total of 476 PTC cases plotted on TMA were employed for determining the mutation status in this study. The cancer tissue of initial 100 …
Access To Malaria Diagnostic Testing, Anti-Malarial Treatment And Long-Lasting Insecticidal Nets Among Immigrant Workers In Yala Province, Southern Thailand, Tinzar Naing
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: In Southeast Asia, trans-border migration from neighboring countries into Thailand is a well-known phenomenon. Population movement and migration is a factor having significant implications for vector-borne disease transmissions. Objectives: This study aims to assess migrants’ access to malaria diagnosis and treatment in Yala province who have had fever in the previous three months and to evaluate the coverage and utilization of ITNs (insecticidal nets). Methodology: A survey was conducted among 414 immigrant workers, in which information was sought on socio-demography, history of fever, health seeking behaviours, net ownership and utilization. Survey analysis was employed. Results: As key findings, 36.5% …
Heuristics Used In Credibility Judgment Of Health Information On Facebook, Yaninee Petcharanan
Heuristics Used In Credibility Judgment Of Health Information On Facebook, Yaninee Petcharanan
Chulalongkorn University Theses and Dissertations (Chula ETD)
Facebook users worldwide had been facing challenges of information credibility. This study aimed to address this issue among Thai Facebook users by focusing on health information in particular, through a lens of heuristic approach. Data were collected from 50 informants by in-depth interviews and 480 responses from online surveys. All participants were at least 18 years old with a minimum of one year experience in using Facebook. The results revealed three different processes and five heuristics, namely, reputation heuristic, authority heuristic, expectancy violation heuristic, persuasive intense heuristic, and bandwagon heuristics that participants adopted when making a credibility judgment of health …