Sirindhorn International Institute of Technology

About: Sirindhorn International Institute of Technology is a based out in . It is known for research contribution in the topics: Supply chain & Combustion. The organization has 1048 authors who have published 1678 publications receiving 30067 citations.

Detection of exudates from retinal images using morphological compact tree

Abstract: Exudates are an important sign of Diabetic Retinopathy. Retinal Exudates are formed when lipid leakage occurs from damage capillaries. They are deep yellowish in colour and can be easily confused with other yellowish regions in retina. Detection of exudates is very important for developing an automated screening system for detection of diabetic retinopathy. In this paper we focus on detection of exudates through morphological compact tree. We did some pre-processing for removal of noise and enhancement of image. Blobbing technique was applied and all the connected pixels were counted as single blob. These blobs are then passed through an area filter which removes blobs with very large areas. The remaining blobs are then divided into three categories small, medium and large. The medium and large blobs are again fed into pre-processing mode one by one to remove strong boundaries effect and extract the exact suspected candidate location. All the blobs are then passed through morphological compact tree of filters which removes the non-exudates regions through different. For each image different set of threshold values for the filters are required. In our technique we are setting it manually but further research is needed to find out the optimal threshold values or a technique which can calculate adaptive thresholds values for these filters. This is very simple method for the detection of exudates as it uses only a morphological filtration tree. 10 images of dimension 500∗752 were analysed in this experiment. The results were compared with ophthalmologist's hand drawn ground truths. Mean recall of 78 percent and mean precision of 56 percent were obtained.

A study of sensing heat flow through thermal walls by using thermoelectric module

Abstract: Demands on heat flow detection at a plane wall via a thermoelectric module have drawn researchers’ attention to quantitative understanding in order to properly implement the thermoelectric module in thermal engineering practices. Basic mathematical models of both heat transfer through a plane wall and thermoelectric effects are numerically solved to represent genuine behaviors of heat flow detection by mounting a thermoelectric module at a plane wall. The heat transfer through the plane wall is expected to be detected. It is intriguing from simulation results that the heat rejected at the plane wall is identical to the heat absorbed by the thermoelectric module when the area of the plane wall is the same as that of the thermoelectric module. Furthermore, both the area sizes of the plane walls and the convective heat transfer coefficients at the wall influence amount of the heat absorbed by the thermoelectric module. Those observational data are modeled for development of sensing heat flow through a plane wall by a thermoelectric module in practical uses.

Quantitative Structural Rearrangement of HIV-1 Reverse Transcriptase on Binding to Non-Nucleoside Inhibitors

Abstract: The crystal structures of HIV-1 reverse transcriptase (RT) and some of its inhibitor complexes have been compared quantitatively with respect to backbone and side chain dihedral angles. Furthermore distances between inhibitor molecules and surrounding amino acids have been analyzed in detail. The calculation of the conformation for all structures allows us to determine quantitative structural changes of HIV-1 RT on binding to NNIs or to RNA/DNA.

Effects of Sand Powder on Sulfuric Acid Resistance, Compressive Strength, Cost Benefits, and CO2 Reduction of High CaO Fly Ash Concrete

Abstract: This article studies the efficiency of sand powder as a supplementary cementitious material (SCM) in improving the sulfuric acid resistance of concrete incorporated with high CaO fly ash. Besides, the effects of sand powder on compressive strength development, mitigation of carbon dioxide emission, and cost-effectiveness are addressed. Paste mixtures with W/B ratios of 0.25 and 0.40 were used in this study for the performances of sulfuric acid resistance and long-term compressive strength development. The test results indicated that sand powder could reduce the weight loss of the tested paste specimens in sulfuric acid solution with a pH of 1, compared to the control specimens, especially for the specimens incorporated with high CaO fly ash. The sand powder addition could also increase the compressive strength of cement pastes at the age of 90 days by 26.27% and 43.80% for W/B ratios of 0.25 and 0.40, respectively. The use of sand powder in the evaluated concrete mixture could also reduce CO2 emission by 23.23% and lower the cost of the mixtures by 8.05%, compared to the control mixture. The addition of sand powder could significantly increase the sulfuric acid resistance, compressive strength, and economic benefits and reduce the CO2 emission of high CaO fly ash-cement-based materials.