cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2007.1792
title: Image sequence registration and image estimation techniques for super-resolution reconstruction

description: This dissertation proposes two novel algorithms: the highly accurate sub-pixel image registration and the robust norm for SRR algorithm. The proposed registration assumes the affine motion as the relationship between blocked images (the current frame and the reference frame). It is applicable to not only the standard sequences but also real sequences with complex motion. Therefore, it can be implemented in the previous SRR algorithms. Moreover, it can be implemented in motion estimation algorithm. To realize the implementation of the proposed sub-pixel image registration, the fast algorithm is designed to reduce the computational load for the proposed sub-pixel registration. This dissertation considers the use of a regularized maximum likelihood estimator in the image estimation process due to its high performance and low complexity. This dissertation also studies the effect of norm estimation in SRR algorithm. The L1 or L2 norms with different regularized functions are interested in this work. The novel robust norms (Huber norm, Lorentzian norm and Tukey’s Biweigth norm) are proposed into the model of the SRR framework using the proposed registration. To evaluate the effectiveness of the proposed image registration and the robust norm for SRR algorithm, various noise model and image sequences used in SRR algorithm have been investigated. Five experiments have been carried out to demonstrate the performance of the proposed methods: 1) Experimental on fast affine block-based registration, 2) Experimental on the SRR algorithm using fast affine block-based registration, 3) Experimental on robust estimation technique for SRR, 4) Experimental on the SRR algorithm using robust estimation technique with classical registration and 5) Experimental on robust estimation technique using affine block-based registration for SRR. Experimental results show than the affine block-based registration algorithm clearly gives a higher accuracy than the classical algorithm both objectively and subjectively. By using this proposed registration algorithm, the super-resolution algorithm can be applied on the general sequence such as Foreman and Susie sequence. Moreover, the proposed robust SRR can be effectively applied on the images that are corrupted by various noise models. Experimental results clearly demonstrated that the proposed robust algorithm is applicable on the several noise models such as Noiseless, AWGN, Poisson Noise and Salt&Pepper Noise and Speckle Noise and the proposed algorithm can obviously improve the result both subjectively and objectively.
DOI: 10.14457/cu.the.2007.1793
title: Catalytic epoxidation with cobalt (II) calix[4]pyrrol and cobalt (II) schiff base complexes

description: The epoxidation of alkenes catalyzed by cobalt(II) calix[4]pyrrole in the presence of 2-ethylbutyraldehyde/O2 was examined. Cyclohexene was converted to cyclohexene oxide in high yield and excellent selectivity. Ligands and solvents are two major influent parameters affecting on the reaction. Cobalt(II) calix[4]pyrrole (68) and cobalt(II) benzimidazole (72) were disclosed to be the most efficient catalyst tested. Various substrates such as (R)- and (S)-limonenes, geraniol, geranyl acetate, 4-vinylcyclohexene, trans-2-hexen-1-ol, 3-octen-1-ol, cis- and trans-stilbenes and cholesterol derivatives were chosen to explore the regio-, chemo- and stereoselectivity of the reaction. The mechanism of the reaction was believed to take place via peroxy acid and free radical process. The condensation of aromatic aldehydes with several diamines was examined. The results clearly indicated that only Schiff bases were formed when using 1,2-ethylenediamine or 1,3-propylenediamine, while an apparent intramolecular cyclization took place with the use of 1,2-phenylenediamine. In the latter case, rigid structure of the diamine should be able to induce the formation of more stable and highly aromatic products. Intriguingly, in the case of 1,2-phenylenediamine, the ratio of the two starting materials and the choice of solvent played significant role in the reaction outcomes.
DOI: 10.14457/cu.the.2007.1794
title: Synthesis of glyphosate from glycine using zeolites as catalysts

description: Glyphosate (N-phosphonomethylglycine) is the most frequently used herbicide in the world. It is used to control a wide variety of annual and perennial weeds. Glyphosate is used worldwide in the form of an aqueous solution of isopropylamine salt and this organic phosphorous herbicide is considered as a non-toxic herbicide for mammals when used normally. At present, preparation of glyphosate in the industry comprises of two steps; (1) preparation of N-phosphonomethyliminodiacetic acid from iminodiacetic acid and (2) oxidation of N-phosphonomethyliminodiacetic to glyphosate using cobalt(II)chloride as a catalyst. In this research, we synthesized glyphosate from formaldehyde, glycine and phosphorous acid as one-pot reaction. Two optimum conditions were found: (1) The use of 2:1:1 formaldehyde:glycine: phosphorous acid mole ratio at 70 C for 2 hours giving 35% yield; (2) The use of 2:1:0.5 formaldehyde:glycine:phosphorous acid mole ratio with the catalysis of acid activated molecular sieve 3A (137 meq/100 g; 4 g per 1 mole glycine) at the same temperature and reaction time, leading to 39% yield. However, using hydrochloric acid as a catalyst gave higher yield of glyphosate than using sulfuric acid as a catalyst. The resulting product mixtures were monitored and quantitatively determined by proton nuclear magnetic resonance spectroscopy using sodium acetate as an internal standard.
DOI: 10.14457/cu.the.2007.1795
title: A Comparative study of the moon image in Chinese and Thai classical poetry

description: 雖然中泰兩國共同擁有一輪月亮，但因爲不同的文化風俗、思想觀念、地理環境、氣候季節等方面，所以中泰古典詩詞中的月亮意象都反映了不同的感情，不同的想法。本論文的研究目的是探討和對比中泰古典詩詞中的月亮意象。本論文採用平行研究的方法，通過對中泰古典詩詞中月亮意象的比較，加深對月亮意象的理解，總結出中泰古典詩詞中月亮意象的“同”和“異”，並對產生這種同異的原因進行分析。本研究結果發現，月亮在中泰古典詩詞中形成了豐富的意象，月亮都是美麗的象徵，同時也代表女性，但是泰國在審美方面的月亮意象有一個特點就是，不管是男人或是女人都可以用月亮來比喻。中國的月亮意象最主要是表達丈夫愛人、親朋好友間的離別相思，還能表示懷鄉戀土、寂寞失意之感，但泰國的月亮意象，雖然能代表離別相思、寂寞孤獨的感情，但泰國的月亮意象主要是表達男女之間的愛情，不管是詩人表達對遠方愛人的懷念還是表達高不可攀的愛情失意。月亮除了能表達人類的情感，它還能表現人類宇宙人生的思想。中國古人認爲月亮是永恒的但人生卻是有限的，月能缺而又復但人的生命，死卻不能復生了。但從泰國的思想觀念來看，月亮不是宇宙永恒的事物 中泰古典詩詞中月亮意象表現的方式能分爲三個層次，就是意象的直接傳達、意象的間接傳達和意象的繼起傳達。中泰古典詩詞中的月亮意象的直接傳達大部分都出現在詩人描寫美麗的風景中。意象的間接傳達可以分爲兩個方面，就是以月為本體與以月為喻體。泰國古典詩詞中雖然有月為本體的方法，但詩的數量卻很少，詩詞最多的是在月為喻體方面。意象的繼起傳達在泰國古典詩詞中很少。中泰詩詞中月的形態與主體的感發分爲兩種“圓月”和“缺月”。中國人對“圓月”感到美滿、團圓、清涼、溫柔，而“缺月”卻使人感到離愁、傷感。泰國人對 “圓月”感到美麗、愉快，同時也表示女人的美貌。但對 “缺月”，泰國人把它比作美女的眉毛，或者比作黑暗的現象、人類的黑心薄情，或者認爲虧月與神術有關。中泰古典詩詞中的月與其他意象的組構。本論文選取了中國古典詩詞中最常見的“月與雲”、“月與水”、“月與山”和“月與酒”四組意象的組合。泰國的古典詩詞中也有“月與雲”、“月與水”和“月與山”，但卻沒有“月與酒”。
DOI: 10.14457/cu.the.2007.1798
title: Development of wood-substtuted composites from PVC

description: Wood plastic composite is generally a combination of thermoplastic and natural filler. This kind of thermoplastic composites evolves as structural polymer composites, which have many beneficial properties such as low density and good mechanical properties, as well as good insulation and environmental resistance. In this study, three species of woodflours i.e. rubber wood, mixed wood, and teak wood, are used as a reinforcing agent in a polyvinylchloride matrix because these woods are abundant and widely grown in Thailand. The effects of particle loading (0-60 phr), particle sizes (&lt;150 to 600-850 µm), and species of woodflours on mechanical properties, thermal properties, water absorption, and weathering aging behaviors of the obtained PVC wood composites are characterized. The results reveal that, the composite strengths decrease about 14% with increasing particle loading up to 60 phr but moduli increase about 40% of the unfilled PVC matrix. The decrease of strength of PVC wood composites is attributed to some interfacial defects between the woodflour and the PVC matrix. The effects of particle sizes on the mechanical properties of PVC wood composites are found to decrease with increasing the particle size up to 600-850 µm. In addition, the woodflour types have no significant effect on the mechanical and thermal properties of the PVC wood composites. However, the types of woodflours can cause the variation in color and texture of the obtained composites. Furthermore, the natural weathering after 1 month exposure in Bangkok, Thailand, results in the decrease in the composites flexural strength about 5% and the composites flexural modulus about 9% i.e. a particle loading of 60 phr. All the specimens also show a significant color fading. Finally, the suitable formulations of PVC wood composites are to use a woodflour loading of 40 phr at average particle size of 180-250 µm and 250-450 µm.
DOI: 10.14457/cu.the.2007.1799
title: Characterization and gene organization of anti-lipopolysaccharide factor in the black shrimp Penaeus monodon

description: Different isoforms of the ALF homologues (ALFPm1 to 5) have been previously identified from Penaeus monodon expressed sequence tag (EST) database (http://pmonodon.biotec.or.th). The nucleotide and amino acid sequences of the P. monodon ALF homologues were analyzed and categorized into two groups, ALFPm1 and 2 in group A and ALFPm3 to 5 in group B. The genomic sequences of the two ALF gene groups were obtained by using the PCR and genome walking techniques. The ALF group A gene consisted of three exons interrupted by two introns whereas the ALF group B gene contained four exons interrupted by three introns. The alignment of genomic sequences with the ALF cDNA sequences revealed that different transcripts in both groups were generated by alternative RNA splicing of the pre-mRNA transcripts. The 5´ upstream sequences of the two ALF groups contained the putative cis-regulatory elements, including the activator protein 1, the Octamer, the GATA, the nuclear factor-kappaB, and the GAAA motifs, which possibly promoted transcription in response to infection as in other antimicrobial peptide genes. The RT-PCR analysis revealed that although all ALF isoforms were expressed in individual shrimp, the ALFPm2 and 3 were the major or authentic ALFs in the hemocytes. The expression of ALFPm2 and 3 were increased in response to Vibrio harveyi infection indicating the important function of the ALFs against bacterial invasion. To further characterize the activity of ALFPm2, the recombinant ALFPm2 protein (rALFPm2) was produced in the Pichia pastoris and then purified using cation exchange chromatography. The purified rALFPm2 showed antibacterial activity against Escherichia coli 363 and Bacillus megaterium. Moreover, 20 μM of rALFPm3 but not rALFPm2 exhibited the antiviral activity against the white spot syndrome virus (WSSV) by inhibiting the propagation of WSSV in hematopoietic stem cells of Pacifastacus leniusculus. Analysis of VP28 transcripts by quantitative RT-PCR showed that the concentration of rALFPm3 required for 50% inhibition of viral propagation in vitro (IC₅₀) was less than 2.5 μM.
DOI: 10.14457/cu.the.2007.1800
title: Flame retardant finishing of fabrics by diammonium hydrogen phosphate using plasma generated from a theta-pinch device

description: This research emphasizes on the method for flame retardant finishing of polyester, cotton and polyester-cotton fabrics by diammonium hydrogen phosphate which is a water soluble flame retardant. A theta-pinch device was used to generate pulsed nitrogen plasma for inducing the reaction between diammonium hydrogen phosphate and these fabrics. The number of plasma shot applied to the fabrics and the concentration of diammonium hydrogen phosphate solution were varied as 1 2 5 and 10 shots and 5 10 15 and 20%, respectively. The fabric morphology investigated by scanning electron microscope (SEM) showed etching effect and the presence of diammonium hydrogen phosphate on the fabric surface. Dhemical structure characterized by Attenuated Total Reflectance Fourier Transform Infrared (ATR/FT-IR) Spectroscopy and wettability of plasma-treated and untreated fabrics before and after washing revealed that different functional groups were formed on the fabric surface depending on the above finishing conditions and also the type of the fabric. As a consequence, the flammability of these three plasma-treated fabrics was different. These results indicated that the optimum condition for improving flame retardancy of polyester-cotton fabric was at 2 shots of pulsed nitrogen plasma and 5% of diammonium hydrogen phosphate solution. However, in the case of polyester fabric, the improvement was observed only for the ignition time but not the combustion time.
DOI: 10.14457/cu.the.2007.1801
title: Fetal dose in rando phantom from computed radiography of abdomen, pelvis and lumbo-sacral spine

description: Computed radiography (CR) has an important role in diagnostic imaging, because of its ease of use and fast processing. However, the patient radiation doses used is highly increased to support multi-resolution results. So it may cause some effects to a fetus in pregnant woman, especially in the first trimester. The purpose of this study is to determine the fetal doses calculating by exposure parameters and measuring with TLD-100 chips in RANDO phantom and to demonstrate the correlation between both methods. The calculation was performed for surface 3.0, 6.0 and 9.0 cm depths for the pelvis AP, abdomen AP and lumbo-sacral spine AP at surface 13.0, 16.0, 19.0 cm depths for lumbo-sacral spine lateral projection. The machines were Toshiba x-ray model KXO-80G and Fuji CR model XG 5000. Before using, the TLD-100 chips were calibrated with Cobalt-60 gamma rays for sensitivity, linearity and energy response. The average fetal doses at 6.0 cm depth in RANDO phantom measured with TLD-100 chips ranged from 0.83 to 1.39 mGy and the calculation were 0.62 to 1.03 mGy for pelvic AP. For abdomen AP, the measured fetal doses ranged from 0.55 to 0.87 mGy and the calculations were 0.36 to 0.67 mGy. For lumbo-sacral spine AP, the measured fetal dose ranged from 0.46 to 1.10 mGy and the calculations were 0.44 to 1.05 mGy. For lumbo-sacral spine LAT, the measured ranged from 0.15 to 0.20 mGy and the calculations were 0.13 to 0.24 mGy. The TLD doses were mostly higher than the calculated doses. The highest different value was 23.46% which observed at the surface, the difference was reduced to 19.19 % at the fetal depth. The dispersion may be caused mainly by the difference of the chamber type used for dose determination and also the parameters employed for calculation. The graph of fetal doses from measured with TLD-100 chips and parameter calculation showed a good correlation. The fetal doses of greater than 1.0 mGy which was the ICRP dose limit to the pregnant patient and radiation worker were observed in the measured with TLD-100 chips than the calculation. Therefore, the patients undergo the CR examination, estimated dose by exposure parameter will give under doses within 23%. When using parameter calculation, careful consideration should be kept in mind.
DOI: 10.14457/cu.the.2007.1802
title: Physical and antimicrobial properties of chitosan film containing cinnamaldehyde

description: This research aims to produce antimicrobial film by incorporating cinnamaldehyde into chitosan film. The films were prepared by dissolving chitosan powder (95% degree of deacetylation) into 1 %v/v acetic or lactic acid solution and blending with glycerol or sorbitol at different concentration (20, 40 and 60 %w/w of chitosan powder) as plasticizer. Physical properties including thickness, tensile strength (TS), elongation at break (EAB), water vapor permeability (WVP) surface color and transparency were examined. Films from acetic acid and lactic acid solution showed similar visual appearance. However, chitosan film-forming solution from lactic acid was difficult to form into film, especially when the plasticizers were added, and thus physical property measurements were not possible. The results showed that an increase in amount of the plasticizers resulted in significant (p 0.05) increase in thickness, decrease in mechanical resistance (decrease in TS) and increase in extensibility (increase in EAB). TS decreased but EAB and WVP increased when the concentration of sorbitol and glycerol increased from 20 to 60 %w/w of chitosan powder. Moreover, film plasticized with sorbitol had lower WVP than those with glycerol at each concentration. The results suggested that 40 %w/w sorbitol was the optimum concentration of plasticizer for forming the chitosan film and thus used for further studies. In further studies, cinnamaldehyde was incorporated into chitosan film-forming solution (plasticized with sorbitol 40 % w/w) at different concentrations (50, 100 and 150 µl/g of chitosan powder). Addition of cinamaldehyde led to a significant increase in both TS and EAB, but a significant decrease in WVP of the films. Increasing of TS and EAB could be due to the interaction between fuctional group of chitosan and cinnamaldehyde. This could be proved by FT-IR spectra results. Antimicrobial property of chitosan film containing cinnamaldyhyde was tested against target microorganisms (S. aureus, B. lichenformis, B. subtilis, E. coli, P. aeruginosa and S. putrefaciens). The film was found to have small inhibition zone against S. aureus while inhibited other target microorganisms only on the contact surface. Addition of cinnamaldehyde could improve physical properties of chitosan film in terms of TS, EAB and WVP. However, only small amount can release from chitosan matrix due to the interaction between functional groups of chitosan and cinnamaldehyde.
DOI: 10.14457/cu.the.2007.1803
title: Phytochemical study of Cryptolepis Buchanani stem

description: From the stem of Cryptolepis buchanani Roem. & Schult. (family Asclepiadaceae), three new naturally occurring pregnane steroids, 2α,21-dihydroxypregn-4-ene-3,20-dione, 2α,21-dihydroxypregn-4,6-diene-3,20-dione and 2,21-dihydroxypregn-1,4,6-triene-3,20-dione, were isolated together: a coumarin, scopoletin; an anthraquinone, danthron; and a mixture of steroids,
DOI: 10.14457/cu.the.2007.1804
title: Effects of English reading instruction based on the reader response approach on critical reading ability and critical thinking ability of upper secondary school students

description: The reader response approach was widely used in the field of literature teaching to enhance reading ability and critical thinking ability of learners in many countries. In Thailand, however, the reader response approach was not widely used in English reading instruction. The researcher, therefore, conducted the present study by designing ten reading lesson plans based on the reader response approach. The purpose of the present study was to examine the effects of the reading instruction based on the reader response approach on critical reading ability and critical thinking ability of upper secondary school students. The participants were twenty-one twelfth grade students from Chulalongkorn University Demonstration School. The research instruments consisted of critical thinking tests, critical English reading tests and student response worksheets. The data from critical thinking tests and critical reading tests were analyzed using t-test. In addition, the student response worksheets were analyzed using content analysis. The findings revealed that the reading instruction based on the reader response approach enhanced students’ critical thinking ability and critical reading ability, the mean scores of critical thinking tests and critical reading tests from the posttests were higher than the mean scores from the pretests at the significant level .05. In addition, the data analysis from student response worksheets indicated that the participants’ critical thinking ability was developed.
DOI: 10.14457/cu.the.2007.1805
title: Phytochemical study of Canavalia Rosea and Elateriospermum Tapos

description: Phytochemical investigation of the chemical constituents of Canavalia rosea (Papilionaceae) aerial parts led to the isolation of six compounds including a new guanidine alkaloid, canarosine, a flavonoid glycoside, rutin, epi-inositol 6-O-methyl ether, β-sitosterol glucoside, and a 2:1 mixture of β-sitosterol and stigmasterol. Canarosine, at 100 μg/ml, caused 95% inhibition dopamine-1 receptor binding with the IC₅₀ value of 39.4 μM. The alkaloid was also active against Plasmodium falciparum K1 strain with IC₅₀ value of 4.48 μg/ml, was moderately active against Herpes simplex virus type 1. Study of chemical constituents of Elateriospermum tapos (Euphorbiaceae) led to the isolation of a total of twenty-five compounds from the stem, flowers and leaves of this plant. From the stem, fourteen compounds including four triterpenoids, lupeol, lupeol acetate, acetyl aleuritolic acid and germanicol palmitate, a new cleistanthane diterpenoid, 2,3-seco-sonderianol, two pimarane diterpenoids, yucalexin P-17 and yucalexin P-15, a beyerane diterpenoid, yucalexin B-22, a biflavonoid, amentoflavone, along with scopoletin, syringaldehyde, oleic acid and a β-sitosterol/stigmasterol (1:1) mixture were isolated. Isolation of its flowers yielded eight compounds including lupeol, lupeol acetate, a flavonoid, quercetin, two biflavonoids, amentoflavone and putraflavone, ellagic acid 3,3'-dimethyl ether and a β-sitosterol/stigmasterol (1:1) mixture. Thirteen compounds were isolated from the leaves of this plant, including two new taraxerane triterpenoids, 2,3-seco-taraxer-14-ene-2,3,28-trioic acid 2,3-dimethyl ester and 2,3-seco-taraxer-14-ene-2,3,28-trioic acid 3-methyl ester, two known triterpenoids, hopenol-B and aleuritolic acid, four biflavonoids, amentoflavone, sequoiaflavone, putraflavone and ginkgetin, a flavonoid, kaempferol, ellagic acid 3,3'-dimethyl ether, β-sitosterol glucoside and a β-sitosterol/stigmasterol mixture. Among the compounds isolated from E. tapos, 2,3-seco-taraxer-14-ene-2,3,28-trioic acid 2,3-dimethyl ester exhibited moderate cytotoxicity against BC cell line with IC₅₀ 7.08 μg/ml, strong cytotoxicity against NCI-H187 cell line with IC₅₀ value of 4.65 μg/ml, and anti-Mycobacterium tuberculosis with MIC value of 3.13 μg/ml. Lupeol was weakly cytotoxic against NCI-H187 cell line with IC₅₀ 18.4 μg/ml. Ginkgetin showed weak cytotoxic activity against KB and BC cell lines, with IC₅₀ values of 18.5 and 10.3 μg/ml, respectively. However, lupeol, ginkgetin and putraflavone were cytotoxic against Vero cells with IC₅₀ values of 13.4, 34.8 and 35.4 μg/ml, respectively. Both 2,3-seco-taraxer-14-ene 2,3,28-trioic acid 3-methyl ester and lupeol were active against M. tuberculosis with the same MIC value of 50 μg/ml. Among the biflavonoids, ginkgetin, putraflavone, amentoflavone and sequoiaflavone showed antituberculosis activity with MIC values of 25, 50, 100 and 200 μg/ml, respectively. Yucalexin P-17 displayed anti-Herpes simplex virus type 1 activity with IC₅₀ value of 3.60 μg/ml.