cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2010.832
title: A Survey of prevalence and factors associated with low back pain in airline pilots

description: The objective of this study was to examine the 12-month prevalence of low back pain (LBP) and to identify individual, flight-related and psychosocial factors associated with the prevalence of LBP in Thai airline pilots. A cross-sectional survey was conducted with a self-administered questionnaire delivered by hand to 708 Thai airline pilots from those visiting the Institute of Aviation Medicine, Royal Thai Air Force for their regular medical examinations during July and October 2010. Bivariate and multivariable logistic regression analyses were used to assess the associations between the prevalence of LBP and statistically significant factors. A total of 684 subjects (a respond rate of 97%) completed the questionnaires. The 12-month prevalence of self-reported LBP among airline pilots was 55.7%. Elevated risk of experiencing LBP was associated with occasionally to frequently encountering turbulence in the previous year, lifting luggage ≥4 times/duty period, perception of noise in the cockpit as being too loud and perception of work hazards at intermediate to high levels, assessed by the Job Content Questionnaire Thai version. On the other hand, the factors that reduced the risk of experiencing LBP were performing vigorous exercise regularly and having 5-23 hour rest time between flights.
DOI: 10.14457/cu.the.2010.833
title: Latent variable analysis for image annotation and retrieval

description: Nowadays, digital photography is very popular type of media used to record important events in everyday’s life. The increasing number of digital images requires a good image database to support image collection and image search. In order to correctly retrieve image according to the user’s query, many researches focus to improve the precision of the retrieval images and the retrieval processing time especially for general image retrieval system using low-level image features where query by words and examples do not have satisfactory retrieval performance. The purpose of this dissertation is thus to develop the image annotation model aimed for higher precision in identifying and retrieving images with acceptable search time and supported query by words or images. The proposed model is called “Two-Probabilistic Latent Semantic Analysis”. The proposed model uses two latent variables of probabilistic latent semantic model, of which the first latent variable is used to group the words in an image database that often occurs, and of which the second latent variable is used to group the visual words usually appear in each word. Based on Bag-of-Feature (BoF) technique applied to image annotation, images in the database are represented by counting the number of visual word of the constructed visual vocabulary. Afterward, the BoF of images corresponding to their meaning is used to construct the annotation models namely naïve Bayes, CMRM, and pLSA, comparing with our proposed model, “Two-pLSA”. Using the automatic image annotation, an unlabeled image is annotated by the words from the constructed models, and then the annotated words of that image are used for a text index for image retrieval task. Moreover, the performance has been evaluated by the precision and speed to find the best model for supporting the annotation and retrieval tasks. The performance values of both tasks are measured by mean Average Precision (mAP) to compare among 4 annotation models. The results showed that our proposed model used to identify meaningful images offers satisfactory performance both in terms of accuracy and speed of annotation and retrieval with appropriate control parameters. In addition, the proposed model also supports query by words and image examples including unlabeled images in the database taken by the photographers without object segmentation and specific meaning.
DOI: 10.14457/cu.the.2010.834
title: Identification and characterization of novel virus-responsive genes in the black tiger shrimp Penaeus monodon

description: White spot syndrome virus (WSSV) and yellow head virus (YHV) are major viral pathogens for various crustaceans which cause severe losses to the shrimp aquaculture. Here, suppression subtractive hybridization (SSH) was employed to identify genes up-regulated in the hemocytes of WSSV- and YHV-infected Penaeus monodon at the early (24 h) and late phases (48 and 72 h) of the viral infections. A number of novel viral responsive genes regarding antiviral immunity and/or viral infection mechanism were uncovered. Among the viral responsive genes obtained from the SSH libraries, two novel genes/proteins first identified and named here, hemocyte homeostasis-associated protein (PmHHAP) and viral responsive protein 15 kDa (VRP15), showed to be greatly abundant in the SSH libraries. Hence, PmHHAP and VRP15 were further characterized for their roles in the shrimp’s response to viral infection. The full-length cDNA of PmHHAP showed high sequence identity to hypothetical proteins from various organisms, with the highest identity (54%) to the hypothetical protein TcasGA2_TC006773 from the red flour beetle, Tribolium castaneum. Transcripts of PmHHAP were expressed in various shrimp tissues with the highest expression in hematopoietic tissue. Upon WSSV infection, a high up-regulation level of shrimp hemocytic HHAP mRNA and protein was observed. Gene silencing of PmHHAP by RNA interference (RNAi) resulted in a significant decrease in the number of circulating hemocytes and 100% shrimp mortality within 30 h of the double-stranded PmHHAP RNA injection (but not in control shrimp), indicating that PmHHAP is essential for shrimp survival. Interestingly, severe damage of hemocytes was observed in vivo in the PmHHAP knockdown shrimp and in vitro in shrimp primary hemocyte cell culture, suggesting that PmHHAP plays an important role in hemocyte homeostasis. Thus, it is speculated that the upregulation of PmHHAP is an important mechanism to control circulating hemocyte levels in crustaceans during viral infection. The full sequence of VRP15 was obtained and showed no significant similarity (E-values &gt; 1x10-4) to any known gene in the GenBank database. A protein domain prediction indicated that its protein structure consisted of a transmembrane helix. VRP15 transcript was mainly expressed in the hemocytes of shrimp, and found to be greatly up-regulated post WSSV-infection. Importantly, the significant reduction of WSSV replication was observed in the VRP15-RNAi knockdown shrimp, indicating that the novel VRP15 is important for viral propagation as its knock-down leads to decrease in viral infection in P. monodon.
DOI: 10.14457/cu.the.2010.835
title: Modal pushover analysis for degrading structures

description: While Non-Linear Response History Analysis (NL-RHA) is the most rigorous procedure to estimate seismic demands for buildings, it is not quite practical for use by regular engineers. Thus, the static pushover analysis, a simple and approximate method, has been improved, and a Modal Pushover Analysis (MPA) has recently been proposed with an assumption that structural responses can be estimated by superposition of modes. Several researchers evaluated MPA procedure by using simple material model, i.e. bi-linear relation, which did not explicitly account for degradation behavior representing the moment-rotation relation of plastic hinge. Therefore, conventional MPA procedure may not be suitable for use with the type of building that takes account degrading behaviour such as reinforced-concrete (RC) buildings. This study aims to develop MPA procedure for degrading structures by utilizing the degrading equivalent SDF systems to improve the step for calculating the target roof displacement of multi-degree-of-freedom (MDF) system. The next step is to evaluate the accuracy of proposed procedure by comparing the floor displacement and the story drift demands estimated by proposed procedure to those computed by NL-RHA, which is regarded as the reference value. The bias is shown by the ratio of floor displacement and story drifts computed by proposed procedure, and dispersion of the story drift ratios were also examined. The evaluation has been performed on a real RC 8-story building and a wide range of frame buildings with heights varying from 3, 6, 9, 12, 15, to 18 stories, designed by strong-column weak-beam concept, and having different strength levels corresponding to systems with reduction factors (R) equal to 2, 4, and 6. The structures were subjected to ground motions: 20 large-magnitude small-distance (LMSR). The following results have been found: (1) using the degrading equivalent SDF systems can predict the peak roof displacement more accurate than using non-degrading, or bi-linear, equivalent SDF systems, (2) the proposed procedure provides less bias of floor displacements and story drift demands than the conventional MPA procedure, (3) the proposed procedure generally provides floor displacements that are quite similar to NL-RHA's results while story drift demands tend to overestimate at lower-half, and underestimate at upper-half of building, (4) the bias and dispersion of both floor displacements and story drift demands tend to increase when the building is subjected to high intensity ground motion and/or the building components are designed with low strength level (5) the bias of seismic demands in the mild-degrading structure estimated by proposed procedure is less than that of the severe-degrading structure.
DOI: 10.14457/cu.the.2010.836
title: Thermoelectric properties of iron silicide synthesized by thermal method

description: The Fe-Si compound with atomic ratio Fe:Si = 1:2.0, 1:2.3 and 1:2.5 were synthesized by thermal method. All samples were annealed at 820 ℃ or 950℃ for 3,6 and 12 h in Ar atmosphere. Longer anneal time increased Seebeck coefficient but ε-FeSi phase still presented in FeSi [subscript 2.0] and FeSi [subscript 2.3] sample. Based on standard deviation of Seebeck coefficient measured by hot-probe technique, it would imply that non-homogenity in FeSi [subscript 2.0] and FeSi [subscript 2.3] samples was higher than that in FeSi [subscript 2.5] sample. Influences of excess Si on thermoelectric properties were investigated. It was shown that the Seebeck coefficient increased and thermal conductivity decreased due to the phonon and carriers scattering by exess Si, especially at lower temperatures than 400℃. Thermoelectric properties, Seebeck coefficient, thermal conductivity and electrical conductivity were measured as a function of temperature (30℃ &lt; T&lt;700℃). The dispersion of excess Si in FeSi [subscript 2.3] and FeSi [subscript 2.5] samples increased the Seebeck coefficient and decreased the thermal conductivity while the present of metallic ε-phase in in FeSi [subscript 2.0] and in FeSi [subscript 2.3] samples increased the electrical conductivity. The highest dimensionless figure of merit ZT for in FeSi [subscript 2.0] and in FeSi [subscript 2.5] were annealed at 950℃ for 12 h were 0.44, 0.48 and 0.20 at 700℃, respectively.
DOI: 10.14457/cu.the.2010.837
title: The corrosion resistance of post metal alloys covered by two cements

description: The objective of this study was to evaluate the corrosion resistance of four types of dental alloys: Au-Pd, Ag-Pd, Ni-Cr and Cu-Al alloys covered by two different dental cements using immersion test in acidic solution. The alloys were cast into ten disc-shaped specimens (5.0 mm diameter and 0.8 mm thick). Each alloy was divided into two groups of five according to the types of cement. Each specimen was covered on one side individually by zinc phosphate cement (Zinc Cement Improved) or resin cement (Panavia F 2.0) with 0.70 mm thick. The specimens were immersed in 10 ml lactic acid/NaCl solution (pH = 2.25) and maintained in incubator at 37 °C for 7 days. The solution without specimens was used as a negative control. The released elements from each alloy into the solution were measured using inductively coupled plasma optical emission spectroscopy (ICP-OES). The elements released after 7 days immersion were reported in µg/ cm². The results found that the elements released from Au-Pd were not detected. Mean of the total elemental release of Au-Pd, Ag-Pd, Ni-Cr and Cu-Al alloys covered with Zinc Cement Improved was 4.19±2.30, 2.31±1.14 and 185.50±17.83 µ g/ cm², respectively. Au-Pd, Ag-Pd, Ni-Cr and Cu-Al alloys covered with Panavia F 2.0 was 3.69±1.51, 2.13±0.60 and 247.31±90.63 µg/cm2, respectively. Two-way ANOVA and Tamhane multiple comparisons analysis revealed the total elemental release of Cu-Al alloy was significantly higher than other alloys when covered with Zinc Cement Improved and Panavia F 2.0 (p&lt;0.05). No significant differences were found among each alloy when cemented with Zinc Cement Improved and Panavia F 2.0 (p&gt;0.05). The amount of elemental release was associated with corrosion resistance that was affected by types of dental alloys but not by the two types of tested cement.
DOI: 10.14457/cu.the.2010.838
title: Effects of Lactobacillus plantarum B7 on serum TNF-α and IL-1β level, lipid peroxidation and apoptosis of gastric mucosa in rats infected with Helicobacter pylori

description: The H. pylori infection causes gastric inflammation and the release of inflammatory mediators. L. plantarum B7 show the highest E. coli LPS-induced TNF-α inhibitory activity in vitro. The present study aims to determine anti-Helicobacter activity of L. plantarum B7 supernatants in vitro, and effects of H. pylori infection and anti-inflammatory effect of L. plantarum B7 doses on serum TNF-α and IL-1β level, histopathology of gastric mucosa, gastric malondialdehyde (MDA) level and apoptosis in gastric epithelial cells in rats. The experiments were divided into two parts. First, in vitro inhibition of H. pylori growth was examined by using L. plantarum B7 supernatants pH 4 and pH 7 at the concentration of 1X, 5X and 10X on plates that were inoculated with H. pylori. The inhibitory effect of H. pylori was interpreted by size of the inhibition zone. Secondary, male Spraque-Dawley rats were divided into four groups including control, H. pylori infected, H. pylori infected with L. plantarum B7 [superscript 6] CFUs/mL treated, and H. pylori infected with L. plantarum B7 10 [superscript 10] CFUs/mL treated groups. One week after H. pylori inoculation, L. plantarum B7 [superscript 6] CFUs/mL or 10 CFUs/mL were fed once daily to L. plantarum B7 treated groups for one week. Rats were sacrificed and blood and gastric samples were collected at the end of the study. In vitro experiment, L. plantarum B7 supernatants inhibited H. pylori growth in a dose-dependent manner and better at intact pH 4. In vivo study, in H. pylori infected group, the stomach histopathology revealed mild to moderate H. pylori colonization and inflammation. Level of gastric MDA and epithelial cell apoptosis increased significantly when compared with control group. However, there were no significant change of serum TNF-α and IL-1β level compared with control group. L. plantarum B7 treatments resulted in improving stomach pathology, decreasing of serum TNF-α level, gastric MDA level and apoptotic epithelial cells, and providing a trend of decreased IL-1β concentration. In conclusion, L. plantarum B7 could attenuate H. pylori-induced gastric inflammation by the improvement of stomach pathology, and reduction of serum TNF-α level, oxidative stress and gastric epithelial cell apoptosis. Moreover, L. plantarum B7 might have a trend to decrease IL-1β concentration. These effects might be involved in the secreted substance of L. plantarum B7 from in vitro study.
DOI: 10.14457/cu.the.2010.839
title: Application of the human security framework to the impact assessment of Sambor Dam project in Cambodia

description: Although the Human Security (HS) framework has been proposed for quite some years now, attempts to apply the framework to actual developmental projects haven’t been widespread. The concept of a Human Security Impact Assessment (HSIA) is emerging as a new tool to determine the costs and benefits of development projects in a multi-disciplinary way using the Human Security framework, although the HSIA has not been used extensively to date and has never been used to evaluate a dam project. In fact, the range of costs and benefits of large dams have never been analyzed using the Human Security framework. This study does not attempt to do a HSIA, but it is an attempt to test whether it is feasible to use the HSIA tool for a proposed dam project, and also asks whether it would be useful to do so. For a successful and useful HSIA, the study considers that there are three mandatory pre-requisites to be met, namely: being able to determine the current human security situation of the target community; being able to predict the potential impacts of the development project on the community's human security; and the endorsement and support of stakeholders to undertake a HSIA 4 villages in Sambor, Kratie province in Cambodia were interviewed to measure the current HS status. Also, the external stakeholders such as NGOs, Governmental agencies and International organizations were interviewed to find out their current understanding and perception on Sambor community and the proposed Sambor dam, and to anticipate whether a HSIA would be possibly conducted for the Sambor dam project. This study demonstrates that it is possible and would be useful to undertake a HSIA for the Sambor dam project because it will help stakeholders to see the impacts in a more holistic way and to design better projects with a decreased possibility of unfavorable consequences. There certainly is enough information and knowledge existing from the all stakeholders if they are synthesized together to undertake an assessment of the current human security situation in the Sambor area and to anticipate the changes to human security if the proposed Sambor dam is built. However, for a successful HSIA, the current limitations and barriers should be addressed including lack of resources and lack motivation to share information.
DOI: 10.14457/cu.the.2010.840
title: Effects of silica/carbon black hybrid filler on mechanical properties and mophology of styrene butadiene rubber-acrylonitrile butadient rubber blends

description: Carbon black (CB) and silica have been used as the reinforcement fillers of rubber composites. As the each filler possesses its own advantages, the use of silica/CB blends could increase the mechanical, dynamic properties, oil resistance and compression set. However, the appropriate silica/CB ratio giving rise to the optimum properties needs to be study. In this work, the effect of silica/CB hybrid filler on mechanical properties of SBR/NBR blends were studied and the variables are blending ratio of SBR/NBR blends, filler content and ratio of silica/CB hybrid filler. The combination of sulfur and dicumylperoxide as vulcanizing systems was employed. To improve interaction between silica and rubber matrix, 3 types of silane coupling agent, γ-mercaptopropylmethoxysilane, γ- glycidoxypropyltrimethoxysilane and vinyl-tris-(2-methoxyethoxy) silane were used. The effects of silica/CB hybrid filler and coupling agent in rubber compound on tensile strength, modulus, and compression set and oil resistance were analyzed. This rubber blends (SBR/NBR=30/70) with 50 phr silica/CB hybrid filler modified with γ-mercaptopropyltrimethoxysilane, γ-glycidoxypropy-lmethoxysilane, vinyltris-( 2-methoxyethoxy) silane exhibited good mechanical properties oil resistance and compression set and could be used as o-ring for motor oil medium resistance (ASTM oil no.1 and brake fluid).
DOI: 10.14457/cu.the.2010.841
title: Effects of inclusion shapes on electric responses of nonlinear dielectric composites

description: The electric field reponses of two types of nonlinear dielectric composites consisting of elliptic cylindrical inclusions, one with an identical shape and another with distributed shapes, randomly embedded in the host media in the dilute limit are investigated. The dielectric property of the inclusions is that the relation between the displacement field (D) and electric field (E) satisfies a more general form D = ƐE + X | [superscript β]E, where β is a nonlinear integer exponent and ε≫χ | [superscript β] for weakly nonlinear composites. For strongly nonlinear composites, the dielectric property of both inclusion and medium satisfyingD=χ |[superscript 2] E is considered. By using the simple decoupling approximation, the effective nonlinear coefficients (X[subscript e]) are determined and the efforts of inclusion shapes on X[subscript e] are reported in terms of the aspect ratio (M), and the shape distribution paremeter (Δ) for the former and the latter types of composites, respectively. For weakly nonlinear composites with identical inclusion shape, the results show the rapid increase in X[subscript e] with increasing M within the range of lower values of M. However, within the range of higher values of M, increasing M affects the increasing of X[subscript e] very slightly. The similar behavior is also observed for strongly nonlinear composites. For composites with distributed inclusion shapes, the results reveal the rapid increase or decrease in X[subscript e] within increasing Δ, especially, when Δ near 1. Furthermore, the exact analytic rusult of X[subscript e] for weakly nonlinear ellitical composites with distributed inclusion shapes for the case of β = 2 is also determined and this is consistent with the numerical result.
DOI: 10.14457/cu.the.2010.842
title: Petrochemistry of volcanic rocks in Q-prospect of The Chatree Gold Deposit, Changwat Phichit

description: Q-prospect area is situated in the northern Chatree gold deposit in which is generally composed of porphyritic andesite, andesitic tuff, rhyolitic tuff that are cross cut by andesite dike. Petrographically, the porphyritic andesite samples usually show hypocrystalline and microporphyritic to porphyritic textures. Their groundmass usually contains plagioclase microlite and glass. Andesitic tuff contains 0.05-2 mm up to 20 % volcanic fragments embedded in volcanic ash and glassy materials. Rhyolitic tuff usually present 0.5-2 mm quartz grains and wedge-shaped rock fragments, mainly replaced by chlorites; these crystals and rock fragments are set in microcrystalline quartz and glass. Andesite dike samples normally show subophitic texture, which represented by the occurrence of small plagioclase enclosed partly by pyroxene crystals. Geochemically, twenty-five rock samples were analyzed for major oxides and some trace elements using XRF and ICP-MS techniques, respectively. Plots of Zr/TiO₂ versus SiO₂ diagram indicate that these rock samples are equivalent to andesite, sub-alkaline basalt to rhyodacite/dacite and rhyorite. They appear to have derived from tholeiitic magma for host porphyritic andesite, andesitic tuff and rhyolitic tuff, and calc-alkaline magmas for late stage andesite dike, based on Zr-P2O5 and Zr-Y diagrams. Regarding tectono-diagrams, such as Th-Zr-Nb, La-Y-Nb, Zr-Ti, La/Yb-Sc/Ni and Th/Yb-Nb/Yb, suggest that these rocks appear to have originated in relation to island arc. MORB normalized patterns show enrichments of Sr, K, Rb, Ba and Th with depleted of HFS elements indicating volcanic arc environment.
DOI: 10.14457/cu.the.2010.843
title: A novel multi-criteria user profile based on criteria - ranking for movie recommender

description: This thesis aims at proposing a novel methodology for Movie Recommender System based on multi-criteria ratings. Many researchers have been developed the multiple criteria ratings on various ways. Most of them directly use the values of user profiles to find the relation among users, which may cause problems and tend to provide poor quality neighbors. Therefore, I propose Criteria-Ranking with Closeness Score to indicate the significance of criteria toward each user characteristic that will improve the quality of user profiles. According to the experimental evaluation, Criteria-Ranking with Closeness Score provides more accurate recommendation results than other traditional multi-criteria recommender techniques.